2.7 Solar and illuminance data
2.7.4 Sol-air temperatures for the UK
The procedure for estimating long-wave radiation loss and the calculation of sol-air temperatures are given in CIBSE Guide J: Weather, solar and illuminance data(1). Tables 2.34 to 2.36 provide and hourly air and sol-air temperatures for three UK locations: London area (Bracknell), Manchester
(Aughton) and Edinburgh (Mylnefield)†. For Tables 2.35 and 2.36, refer to the CD-ROMthat accompanies this Guide.
These tables were derived from the 97.5 percentile daily global irradiation exceedence data, see Tables 2.30 to 2.32, in combination with the associated month by month mean hour ending synoptic data. The associated hourly means of the synoptic data were extracted for the same days used to determine the 97.5 percentile irradiation data sets. It was assumed that synoptic time and LATwere identical.
Standardised values for the various parameters were assumed, as follows:
— short-wave surface absorptance: αrad = 0.9 (dark coloured surface), 0.5 (light coloured surface)
— long-wave surface absorptance/emittance: α1 = ε1
= 0.9
The long-wave radiation was calculated using sunshine data when the solar altitude was above 6° and cloud data when the solar altitude was 6° or less. The solar radiation was set to zero when the solar altitude was below 1°. For further details see CIBSE Guide J: Weather, solar and illuminance data(1).
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) (a) January 29
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 2.5 0.2 0.2 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
02 2.0 –0.2 –0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
03 1.9 –0.4 –0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
04 1.4 –1.1 –1.1 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 05 1.2 –1.4 –1.4 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 06 0.9 –1.6 –1.6 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 07 0.7 –1.9 –1.9 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 08 0.7 –2.0 –2.0 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4 –1.4
09 1.2 1.3 0.1 0.2 –0.3 1.8 0.6 13.9 7.4 17.9 9.7 11.9 6.3 0.2 –0.3 0.2 –0.3 0.2 –0.3
10 2.3 5.6 2.9 2.7 1.8 2.7 1.8 18.7 10.8 28.7 16.5 24.0 13.8 6.9 4.1 2.7 1.8 2.7 1.8
11 3.7 9.6 5.7 4.9 3.8 4.9 3.8 16.7 10.4 32.7 19.5 32.7 19.5 16.7 10.4 4.9 3.8 4.9 3.8
12 4.7 11.5 7.3 6.2 5.0 6.2 5.0 10.3 7.3 29.6 18.2 35.1 21.4 24.2 15.1 6.2 5.0 6.2 5.0
13 5.5 12.2 8.0 7.0 5.8 7.0 5.8 7.0 5.8 24.5 15.6 35.0 21.7 29.7 18.6 11.0 8.0 7.0 5.8
14 5.9 10.9 7.5 7.1 6.0 7.1 6.0 7.1 6.0 16.7 11.4 29.6 18.7 29.6 18.7 16.7 11.4 7.1 6.0
15 5.8 8.5 6.2 6.3 5.4 6.3 5.4 6.3 5.4 9.3 7.1 21.5 14.0 24.8 15.9 17.6 11.8 6.3 5.4
16 5.3 5.0 4.2 4.3 3.9 4.3 3.9 4.3 3.9 4.3 3.9 11.2 7.8 14.7 9.8 12.3 8.4 5.3 4.5
17 4.3 1.9 1.9 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3
18 3.7 1.2 1.2 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
19 3.3 1.0 1.0 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4
20 3.0 10.7 0.7 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1
21 2.7 0.4 0.4 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
22 2.2 –0.2 –0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
23 1.8 –0.6 –0.6 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 24 1.8 –0.6 –0.6 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2
Mean: 2.9 2.5 1.6 1.7 1.4 1.8 1.5 3.6 2.5 6.9 4.4 8.5 5.2 6.2 4.0 3.1 2.2 1.8 1.4
*Hour ending
† Sol-air temperatures are based on solar radiation data and air temperature data for the following combinations of sites: London area:
Bracknell (radiation) and Heathrow (air temperature); Manchester:
Aughton (radiation) and Ringway (air temperature); Edinburgh:
Mylnefield/Strathallan (radiation) and Turnhouse (air temperature)
page corrected: Jan 07
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (b) February 26
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 2.3 –0.2 –0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
02 2.0 –0.6 –0.6 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 –0.1 03 1.9 –0.8 –0.8 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 04 1.5 –1.2 –1.2 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 05 1.4 –1.2 –1.2 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 –0.7 06 1.2 –1.4 –1.4 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 –0.9 07 1.1 –1.5 –1.5 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0 –1.0
08 1.4 0.8 –0.2 0.2 –0.2 4.5 2.1 10.4 5.5 10.5 5.5 4.7 2.3 0.2 –0.2 0.2 –0.2 0.2 –0.2
09 2.5 6.3 3.4 3.3 2.3 7.2 4.4 21.2 12.3 24.9 14.5 16.4 9.6 3.3 2.3 3.3 2.3 3.3 2.3
10 3.8 10.9 6.6 5.9 4.5 5.9 4.5 22.6 13.9 31.1 18.7 25.4 15.5 8.2 5.8 5.9 4.5 5.9 4.5
11 5.2 14.7 9.3 7.9 6.3 7.9 6.3 19.7 12.9 33.3 20.7 32.4 20.2 17.4 11.7 7.9 6.3 7.9 6.3
12 6.3 17.3 11.2 9.5 7.8 9.5 7.8 13.8 10.2 32.0 20.4 36.9 23.3 26.3 17.2 9.5 7.8 9.5 7.8
13 7.1 17.5 11.7 10.1 8.5 10.1 8.5 10.1 8.5 26.0 17.4 36.1 23.1 31.4 20.5 14.2 10.8 10.1 8.5 14 7.7 16.5 11.4 10.1 8.6 10.1 8.6 10.1 8.6 19.1 13.7 33.4 21.8 34.3 22.3 21.3 14.9 10.1 8.6
15 7.7 14.0 10.0 9.3 8.1 9.3 8.1 9.3 8.1 11.4 9.3 27.9 18.5 33.4 21.7 25.2 17.0 9.3 8.1
16 7.2 10.0 7.6 7.5 6.7 7.5 6.7 7.5 6.7 7.5 6.7 19.2 13.3 27.0 17.7 23.6 15.8 11.0 8.6
17 6.1 5.6 4.8 5.1 4.7 5.1 4.7 5.1 4.7 5.1 4.7 8.4 6.6 12.7 9.0 12.7 9.0 8.3 6.5
18 5.0 2.6 2.6 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1
19 4.4 1.8 1.8 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3
20 3.8 1.2 1.2 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
21 3.3 0.6 0.6 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2
22 3.0 0.2 0.2 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7
23 2.7 –0.1 –0.1 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
24 2.5 –0.3 –0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Mean: 3.8 4.7 3.1 3.1 2.7 3.5 2.8 5.7 4.1 8.6 5.7 10.3 6.7 8.4 5.6 5.4 3.9 3.4 2.8
*Hour ending (c) March 29
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 4.8 1.7 1.7 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4
02 4.3 1.4 1.4 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0
03 4.1 1.1 1.1 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
04 3.5 0.2 0.2 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
05 3.2 –0.2 –0.2 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
06 3.0 –0.3 –0.3 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
07 3.2 3.1 1.7 2.0 1.4 12.4 7.3 17.5 10.2 13.9 8.1 3.3 2.1 2.0 1.4 2.0 1.4 2.0 1.4
08 4.6 10.6 6.6 6.3 4.9 19.8 12.5 32.1 19.6 29.9 18.3 14.1 9.3 6.3 4.9 6.3 4.9 6.3 4.9
09 6.6 17.0 11.0 9.7 7.8 18.4 12.7 36.0 22.8 38.5 24.2 24.7 16.3 9.7 7.8 9.7 7.8 9.7 7.8
10 8.2 22.4 14.7 12.5 10.3 13.3 10.8 34.4 22.7 42.4 27.3 33.5 22.2 12.5 10.3 12.5 10.3 12.5 10.3 11 9.7 26.5 17.7 15.0 12.5 15.0 12.5 29.1 20.5 42.2 28.0 39.8 26.6 23.0 17.0 15.0 12.5 15.0 12.5 12 11.1 29.6 20.0 16.8 14.3 16.8 14.3 21.9 17.1 40.0 27.4 44.5 30.0 33.2 23.5 16.8 14.3 16.8 14.3 13 12.1 30.0 20.7 17.7 15.2 17.7 15.2 17.7 15.2 33.5 24.1 44.5 30.4 40.1 27.9 22.6 17.9 17.7 15.2 14 12.6 28.6 20.2 17.6 15.2 17.6 15.2 17.6 15.2 25.3 19.6 41.7 28.9 44.1 30.3 31.3 23.0 17.6 15.2 15 12.7 26.2 18.8 16.7 14.7 16.7 14.7 16.7 14.7 16.7 14.7 37.0 26.2 45.7 31.1 37.9 26.7 17.5 15.1 16 12.6 21.6 16.2 15.1 13.4 15.1 13.4 15.1 13.4 15.1 13.4 28.9 21.2 41.9 28.7 39.6 27.3 23.2 18.0 17 12.1 16.1 12.9 12.8 11.7 12.8 11.7 12.8 11.7 12.8 11.7 19.5 15.4 33.2 23.2 35.1 24.3 24.4 18.3
18 10.9 10.3 9.3 9.6 9.2 9.6 9.2 9.6 9.2 9.6 9.2 10.6 9.7 18.2 14.0 20.8 15.5 17.2 13.4
19 9.7 6.6 6.6 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3
20 8.6 5.6 5.6 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2
21 7.7 4.6 4.6 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3
22 6.8 3.4 3.4 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2
23 5.8 2.4 2.4 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2
24 5.6 2.2 2.2 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0
Mean: 7.6 11.3 8.3 7.9 7.0 9.3 7.8 12.4 9.6 14.9 11.0 15.8 11.5 14.5 10.7 12.0 9.3 9.1 7.7
*Hour ending Table continues
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (d) April 28
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 7.1 3.9 3.9 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7
02 6.4 3.2 3.2 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0
03 6.0 2.9 2.9 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6
04 5.6 2.3 2.3 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1
05 5.3 2.0 2.0 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7
06 5.7 5.1 3.9 8.7 6.2 18.4 11.7 20.1 12.7 12.7 8.5 4.3 3.8 4.3 3.8 4.3 3.8 4.3 3.8
07 7.4 12.3 8.6 10.3 8.2 29.8 19.3 36.7 23.3 27.7 18.1 8.4 7.2 8.4 7.2 8.4 7.2 8.4 7.2
08 9.4 19.0 13.4 12.2 10.5 29.8 20.4 41.0 26.8 35.9 23.9 16.9 13.1 12.2 10.5 12.2 10.5 12.2 10.5 09 11.1 25.6 17.9 15.5 13.4 27.4 20.1 43.1 29.1 42.9 29.0 26.9 19.8 15.5 13.4 15.5 13.4 15.5 13.4 10 12.8 30.6 21.5 18.3 15.9 22.0 18.0 39.9 28.1 45.0 31.1 34.8 25.2 18.3 15.9 18.3 15.9 18.3 15.9 11 14.3 33.7 23.9 20.3 17.8 20.3 17.8 33.7 25.4 43.5 31.0 39.9 28.9 24.8 20.3 20.3 17.8 20.3 17.8 12 15.2 35.3 25.3 21.5 19.0 21.5 19.0 25.9 21.4 39.6 29.2 42.5 30.9 33.3 25.6 21.5 19.0 21.5 19.0 13 16.0 36.0 26.0 22.4 19.8 22.4 19.8 22.4 19.8 34.0 26.4 43.2 31.6 40.2 29.9 26.7 22.2 22.4 19.8 14 16.4 34.2 25.2 22.0 19.7 22.0 19.7 22.0 19.7 26.1 22.0 40.1 29.9 43.4 31.8 34.3 26.6 22.0 19.7 15 16.4 31.6 23.7 21.1 19.0 21.1 19.0 21.1 19.0 21.1 19.0 35.5 27.1 44.5 32.2 40.0 29.7 24.3 20.8 16 16.1 27.6 21.3 19.6 17.8 19.6 17.8 19.6 17.8 19.6 17.8 28.8 23.0 42.0 30.5 42.2 30.6 29.3 23.3 17 15.5 23.0 18.5 17.6 16.2 17.6 16.2 17.6 16.2 17.6 16.2 21.4 18.4 37.0 27.2 41.3 29.6 32.0 24.3 18 14.6 17.5 15.1 16.4 15.0 15.1 14.2 15.1 14.2 15.1 14.2 15.1 14.2 27.8 21.4 33.9 24.8 29.3 22.2 19 13.2 12.7 11.9 14.8 13.3 12.1 11.8 12.1 11.8 12.1 11.8 12.1 11.8 17.2 14.6 21.7 17.1 20.7 16.6
20 11.8 9.5 9.5 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9
21 10.8 8.3 8.3 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8 8.8
22 9.7 7.2 7.2 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7 7.7
23 9.1 6.4 6.4 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9
24 8.3 5.5 5.5 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1
Mean: 11.0 16.5 12.8 12.4 11.2 14.9 12.6 17.8 14.3 18.8 14.8 17.8 14.3 17.8 14.2 16.6 13.6 14.1 12.2
*Hour ending (e) May 29
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 9.8 6.4 6.4 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2
02 9.2 5.7 5.7 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6 6.6
03 8.7 5.2 5.2 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1
04 8.3 4.9 4.9 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7
05 8.1 5.8 5.4 6.5 6.1 6.5 6.1 6.5 6.1 6.5 6.1 6.2 6.0 6.2 6.0 6.2 6.0 6.2 6.0
06 9.2 12.1 9.5 17.9 13.3 31.5 21.0 32.5 21.6 20.4 14.7 9.5 8.6 9.5 8.6 9.5 8.6 9.5 8.6
07 10.9 18.6 13.9 17.4 14.0 35.5 24.3 40.6 27.2 30.1 21.2 13.1 11.6 13.1 11.6 13.1 11.6 13.1 11.6 08 12.7 25.0 18.3 16.5 14.6 35.5 25.3 44.6 30.5 37.8 26.6 18.4 15.6 16.5 14.6 16.5 14.6 16.5 14.6 09 14.4 30.8 22.4 19.5 17.2 32.7 24.7 45.4 32.0 43.2 30.7 27.2 21.6 19.5 17.2 19.5 17.2 19.5 17.2 10 16.0 35.7 25.9 22.1 19.6 27.7 22.8 42.7 31.3 45.6 33.0 34.9 26.8 22.1 19.6 22.1 19.6 22.1 19.6 11 17.4 38.6 28.1 23.9 21.4 23.9 21.4 36.6 28.6 44.1 32.8 39.8 30.3 25.9 22.5 23.9 21.4 23.9 21.4 12 18.4 40.2 29.5 25.2 22.7 25.2 22.7 29.4 25.0 40.4 31.3 42.5 32.4 34.4 27.8 25.2 22.7 25.2 22.7 13 19.3 40.6 30.1 25.9 23.5 25.9 23.5 25.9 23.5 34.9 28.5 42.9 33.0 40.9 31.9 30.0 25.7 25.9 23.5 14 19.8 39.7 29.8 25.9 23.6 25.9 23.6 25.9 23.6 27.9 24.7 41.0 32.1 45.1 34.4 38.0 30.4 25.9 23.6 15 20.1 37.3 28.6 25.4 23.3 25.4 23.3 25.4 23.3 25.4 23.3 36.7 29.6 46.4 35.1 43.8 33.6 30.4 26.1 16 20.0 33.5 26.4 24.1 22.3 24.1 22.3 24.1 22.3 24.1 22.3 30.6 25.9 44.4 33.7 46.3 34.8 35.4 28.6 17 19.6 29.1 23.8 22.4 20.9 22.4 20.9 22.4 20.9 22.4 20.9 23.9 21.7 40.2 30.9 46.0 34.2 38.3 29.8 18 18.8 24.0 20.6 23.4 20.9 20.1 19.1 20.1 19.1 20.1 19.1 20.1 19.1 33.1 26.4 41.3 31.0 37.4 28.8 19 17.4 18.7 17.1 22.8 19.8 17.3 16.7 17.3 16.7 17.3 16.7 17.3 16.7 24.4 20.7 32.5 25.2 31.8 24.9 20 15.7 13.9 13.7 14.4 14.1 14.2 14.1 14.2 14.1 14.2 14.1 14.2 14.1 14.4 14.1 14.4 14.2 14.4 14.2 21 14.3 11.8 11.8 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 22 13.1 10.5 10.5 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1
23 12.1 9.2 9.2 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9 9.9
24 11.4 8.2 8.2 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0
Mean: 14.4 21.1 16.9 16.7 15.2 19.2 16.7 21.7 18.1 21.8 18.1 20.3 17.2 21.0 17.6 20.7 17.5 18.5 16.2
*Hour ending Table continues
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (f) June 21
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light 01 13.9 10.5 10.5 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 11.4 02 13.1 9.4 9.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4
03 12.4 8.8 8.8 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.6
04 12.0 8.5 8.5 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3
05 12.2 10.3 9.6 11.0 10.3 11.2 10.4 11.1 10.4 11.0 10.3 10.6 10.1 10.6 10.1 10.6 10.1 10.6 10.1 06 13.3 17.8 14.3 24.9 19.0 40.7 28.1 41.4 28.5 26.7 20.0 14.1 12.9 14.1 12.9 14.1 12.9 14.1 12.9 07 15.0 25.7 19.4 24.3 19.7 46.9 32.7 52.5 36.0 38.8 28.0 18.0 16.1 18.0 16.1 18.0 16.1 18.0 16.1 08 16.8 33.4 24.6 21.5 19.2 46.5 33.5 57.3 39.8 48.0 34.4 22.7 19.9 21.5 19.2 21.5 19.2 21.5 19.2 09 18.5 39.8 29.0 24.7 22.1 41.6 31.7 56.3 40.2 53.0 38.3 33.1 26.8 24.7 22.1 24.7 22.1 24.7 22.1 10 20.1 44.9 32.6 27.4 24.6 34.8 28.7 51.8 38.5 54.5 40.1 41.5 32.6 27.4 24.6 27.4 24.6 27.4 24.6 11 21.5 47.8 35.0 29.3 26.5 29.3 26.5 44.3 34.9 52.3 39.5 47.0 36.5 31.0 27.4 29.3 26.5 29.3 26.5 12 22.7 49.3 36.3 30.6 27.8 30.6 27.8 35.4 30.4 47.6 37.4 49.7 38.6 40.6 33.4 30.6 27.8 30.6 27.8 13 23.6 49.3 36.8 31.3 28.5 31.3 28.5 31.3 28.5 41.0 34.0 49.9 39.0 47.9 37.9 35.9 31.1 31.3 28.5 14 24.4 48.1 36.4 31.5 28.8 31.5 28.8 31.5 28.8 33.0 29.7 47.6 37.9 52.4 40.7 45.1 36.5 31.5 28.8 15 24.5 44.8 34.7 30.8 28.3 30.8 28.3 30.8 28.3 30.8 28.3 42.5 34.9 53.3 41.1 51.1 39.8 36.9 31.7 16 24.4 40.5 32.2 29.4 27.2 29.4 27.2 29.4 27.2 29.4 27.2 35.8 30.8 51.3 39.6 53.9 41.1 42.4 34.6 17 24.2 36.1 29.6 27.8 26.0 27.8 26.0 27.8 26.0 27.8 26.0 28.7 26.5 47.4 37.1 54.4 41.1 46.3 36.4 18 23.5 30.8 26.4 30.1 26.7 25.6 24.2 25.6 24.2 25.6 24.2 25.6 24.2 40.6 32.7 50.7 38.4 46.5 36.0 19 22.5 25.2 22.8 30.4 26.2 22.8 22.0 22.8 22.0 22.8 22.0 22.8 22.0 31.6 26.9 42.2 32.9 41.7 32.6 20 20.9 19.5 19.0 19.9 19.4 19.6 19.3 19.6 19.3 19.6 19.3 19.6 19.3 19.9 19.4 19.9 19.4 19.9 19.5 21 19.3 16.6 16.6 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 17.1 22 17.9 15.1 15.1 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 23 16.8 13.7 13.7 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 14.4 24 15.7 12.5 12.5 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 Mean: 18.7 27.4 22.2 21.9 20.1 25.1 21.9 27.9 23.5 27.6 23.3 25.4 22.1 26.4 22.6 26.3 22.5 23.9 21.2
*Hour ending (g) July 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light 01 14.8 11.5 11.5 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 12.3 02 14.2 10.7 10.7 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 03 13.6 10.1 10.1 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 10.9 04 13.2 9.6 9.6 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 05 13.3 11.1 10.6 11.8 11.3 11.9 11.3 11.9 11.3 11.8 11.3 11.5 11.1 11.5 11.1 11.5 11.1 11.5 11.1 06 14.3 18.1 15.0 24.5 19.2 39.1 27.6 39.9 28.0 26.4 20.3 14.8 13.8 14.8 13.8 14.8 13.8 14.8 13.8 07 15.9 25.3 19.7 23.9 19.9 44.3 31.6 49.6 34.6 37.4 27.5 18.4 16.8 18.4 16.8 18.4 16.8 18.4 16.8 08 17.7 32.5 24.6 22.1 20.0 44.1 32.5 53.9 38.2 45.8 33.5 23.5 20.7 22.1 20.0 22.1 20.0 22.1 20.0 09 19.5 38.5 28.8 25.2 22.8 40.2 31.3 53.6 39.0 50.8 37.4 33.0 27.2 25.2 22.8 25.2 22.8 25.2 22.8 10 21.0 42.7 31.9 27.6 25.0 34.0 28.6 49.2 37.3 51.7 38.7 40.4 32.2 27.6 25.0 27.6 25.0 27.6 25.0 11 22.5 45.5 34.2 29.6 27.0 29.6 27.0 42.8 34.4 50.0 38.5 45.4 35.9 31.4 27.9 29.6 27.0 29.6 27.0 12 23.4 46.7 35.3 30.8 28.0 30.8 28.0 35.0 30.4 45.8 36.6 47.7 37.6 39.7 33.1 30.8 28.0 30.8 28.0 13 24.2 48.0 36.4 31.7 29.0 31.7 29.0 31.7 29.0 40.8 34.1 49.0 38.8 47.1 37.7 36.1 31.4 31.7 29.0 14 24.8 46.8 35.9 31.7 29.1 31.7 29.1 31.7 29.1 33.3 30.0 46.8 37.7 51.2 40.2 44.3 36.2 31.7 29.1 15 25.3 44.4 34.8 31.3 29.0 31.3 29.0 31.3 29.0 31.3 29.0 42.7 35.3 52.8 41.1 50.5 39.8 37.0 32.1 16 25.4 40.5 32.7 30.1 28.1 30.1 28.1 30.1 28.1 30.1 28.1 36.5 31.7 51.1 40.0 53.4 41.3 42.4 35.0 17 25.0 35.8 29.9 28.2 26.6 28.2 26.6 28.2 26.6 28.2 26.6 29.2 27.2 46.7 37.0 53.1 40.7 45.3 36.3 18 24.4 30.6 26.7 30.0 27.1 26.1 24.9 26.1 24.9 26.1 24.9 26.1 24.9 39.6 32.5 48.5 37.6 44.7 35.4 19 23.3 25.2 23.3 29.5 26.2 23.3 22.7 23.3 22.7 23.3 22.7 23.3 22.7 30.8 26.9 39.6 31.9 39.1 31.6 20 21.7 20.1 19.8 20.6 20.2 20.4 20.1 20.4 20.1 20.4 20.1 20.4 20.1 20.5 20.2 20.6 20.3 20.6 20.3 21 20.1 17.6 17.6 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 18.1 22 18.9 16.1 16.1 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 23 17.5 14.4 14.4 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 15.2 24 16.7 13.4 13.4 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 14.2 Mean: 19.6 27.3 22.6 22.4 20.7 25.3 22.4 27.8 23.8 27.6 23.7 25.8 22.6 26.7 23.1 26.5 23.0 24.2 21.8
*Hour ending Table continues
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (h) August 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light 01 15.7 12.5 12.5 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 13.2 02 15.0 11.6 11.6 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 12.4 03 14.4 10.9 10.9 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 11.7 04 13.9 10.3 10.3 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 05 13.4 10.4 10.2 11.1 10.9 11.1 11.0 11.1 11.0 11.1 10.9 11.0 10.9 11.0 10.9 11.0 10.9 11.0 10.9 06 14.0 15.1 13.3 19.1 16.0 29.4 21.8 30.7 22.6 22.4 17.9 13.7 12.9 13.7 12.9 13.7 12.9 13.7 12.9 07 15.6 22.3 17.8 20.3 17.5 39.5 28.4 45.5 32.0 35.9 26.3 17.2 15.8 17.2 15.8 17.2 15.8 17.2 15.8 08 17.4 30.4 23.3 21.3 19.2 42.0 31.0 53.6 37.8 47.0 33.9 25.3 21.5 21.3 19.2 21.3 19.2 21.3 19.2 09 19.4 37.6 28.2 25.0 22.5 39.1 30.5 55.1 39.7 53.9 39.0 36.0 28.7 25.0 22.5 25.0 22.5 25.0 2.5 10 21.2 42.2 31.7 27.7 25.1 32.7 27.9 50.7 38.1 55.2 40.7 44.0 34.3 27.7 25.1 27.7 25.1 27.7 25.1 11 22.6 45.7 34.3 29.7 27.0 29.7 27.0 44.2 35.2 53.9 40.8 49.7 38.3 33.5 29.1 29.7 27.0 29.7 27.0 12 23.9 46.8 35.6 31.2 28.4 31.2 28.4 35.8 31.0 49.2 38.6 51.9 40.2 42.6 34.9 31.2 28.4 31.2 28.4 13 24.8 47.0 36.0 31.9 29.2 31.9 29.2 31.9 29.2 43.0 35.5 52.0 40.6 49.4 39.1 36.5 31.8 31.9 29.2 14 25.4 45.9 35.6 32.0 29.4 32.0 29.4 32.0 29.4 35.5 31.3 49.8 39.5 53.6 41.7 45.0 36.7 32.0 29.4 15 25.8 43.2 34.3 31.2 29.0 31.2 29.0 31.2 29.0 31.2 29.0 45.1 36.8 54.9 42.4 51.0 40.1 35.4 31.3 16 25.7 38.8 31.8 29.8 27.9 29.8 27.9 29.8 27.9 29.8 27.9 38.2 32.6 51.7 40.3 52.6 40.8 40.4 33.8 17 25.2 33.6 28.7 27.7 26.2 27.7 26.2 27.7 26.2 27.7 26.2 30.5 27.8 45.6 36.3 50.2 38.9 42.0 34.3 18 24.3 28.0 25.2 27.0 25.2 25.1 24.1 25.1 24.1 25.1 24.1 25.1 24.1 37.0 30.8 43.3 34.4 39.3 32.1 19 23.0 23.1 22.1 25.3 23.6 22.4 22.0 22.4 22.0 22.4 22.0 22.4 22.0 27.0 24.6 31.5 27.0 30.8 26.6 20 21.3 19.0 18.9 19.4 19.3 19.4 19.3 19.4 19.3 19.4 19.3 19.4 19.3 19.4 19.3 19.4 19.4 19.4 19.4 21 20.0 17.4 17.4 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 17.9 22 18.9 16.2 16.2 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 23 18.0 15.1 15.1 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 24 17.1 14.1 14.1 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 Mean: 19.8 26.6 22.3 21.8 20.4 24.5 21.9 27.5 23.7 28.2 24.0 26.9 23.3 26.8 23.3 25.8 22.7 23.4 21.3
*Hour ending (i) September 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 11.6 8.9 8.9 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.
02 11.1 8.5 8.5 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0
03 10.5 7.8 7.8 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3
04 9.9 6.8 6.8 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5
05 9.5 6.4 6.4 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1
06 9.4 6.6 6.4 7.3 7.1 7.3 7.1 7.3 7.1 7.3 7.1 7.2 7.1 7.2 7.1 7.2 7.1 7.2 7.1
07 10.2 12.0 9.9 10.2 9.4 23.8 17.1 29.7 20.4 24.6 17.5 11.1 9.9 10.2 9.4 10.2 9.4 10.2 9.4 08 12.1 18.9 14.5 13.9 12.5 28.8 20.9 41.2 28.0 38.2 26.3 21.2 16.6 13.9 12.5 13.9 12.5 13.9 12.5 09 14.0 25.0 18.8 17.5 15.6 26.3 20.5 42.5 29.8 44.3 30.8 30.9 23.1 17.5 15.6 17.5 15.6 17.5 15.6 10 15.5 30.7 22.7 20.5 18.2 21.8 18.9 41.9 30.3 49.3 34.6 40.4 29.5 20.5 18.2 20.5 18.2 20.5 18.2 11 16.9 35.1 25.8 22.7 20.2 22.7 20.2 37.2 28.4 50.4 36.0 47.7 34.4 30.4 24.5 22.7 20.2 22.7 20.2 12 18.0 36.9 27.3 24.1 21.6 24.1 21.6 29.0 24.3 46.2 34.1 50.5 36.6 39.6 30.3 24.1 21.6 24.1 21.6 13 18.7 36.2 27.3 24.4 22.0 24.4 22.0 24.4 22.0 38.9 30.1 49.0 35.9 45.0 33.7 29.0 24.6 24.4 22.0 14 18.9 34.6 26.5 23.9 21.7 23.9 21.7 23.9 21.7 30.7 25.6 46.0 34.3 48.4 35.6 36.7 28.9 23.9 21.7 15 19.1 31.9 25.1 22.9 21.1 22.9 21.1 22.9 21.1 22.9 21.1 40.9 31.3 49.1 36.0 42.3 32.1 23.9 21.7 16 18.9 28.3 23.0 21.7 20.2 21.7 20.2 21.7 20.2 21.7 20.2 34.1 27.1 46.7 34.3 45.0 33.3 29.8 24.7 17 18.5 23.3 20.0 19.9 18.7 19.9 18.7 19.9 18.7 19.9 18.7 25.3 21.7 37.8 28.8 40.0 30.0 30.8 24.8 18 17.5 18.6 17.1 17.4 16.8 17.4 16.8 17.4 16.8 17.4 16.8 18.1 17.2 28.7 23.1 32.7 25.4 28.0 22.7 19 16.0 13.8 13.6 14.2 14.1 14.2 14.0 14.2 14.0 14.2 14.0 14.2 14.0 14.3 14.1 14.3 14.1 14.3 14.1 20 14.7 12.0 12.0 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 12.5 21 13.6 10.9 10.9 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 22 12.8 10.0 10.0 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 10.6 23 12.2 9.5 9.5 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0
24 11.6 8.8 8.8 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3 9.3
Mean: 14.2 18.4 15.3 14.8 13.9 16.4 14.8 19.5 16.6 21.7 17.8 22.2 18.1 21.0 17.4 18.8 16.2 16.1 14.6
*Hour ending Table continues
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (j) October 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 9.0 5.7 5.7 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4
02 8.6 5.3 5.3 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1
03 8.2 5.0 5.0 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.7
04 7.8 4.5 4.5 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2
05 7.5 4.1 4.1 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9
06 7.4 4.2 4.2 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9
07 7.8 5.1 4.9 5.6 5.5 5.8 5.6 5.8 5.6 5.8 5.6 5.8 5.6 5.6 5.5 5.6 5.5 5.6 5.5
08 9.2 11.5 9.1 9.1 8.3 20.3 14.6 33.4 22.1 32.8 21.8 18.6 13.6 9.1 8.3 9.1 8.3 9.1 8.3
09 11.4 19.0 14.2 13.0 11.6 20.3 15.7 41.7 28.0 46.3 30.7 32.3 22.5 13.0 11.6 13.0 11.6 13.0 11.6 10 13.4 25.0 18.5 16.3 14.6 16.3 14.6 40.2 28.2 51.1 34.6 42.4 29.5 18.0 15.5 16.3 14.6 16.3 14.6 11 14.8 28.3 21.0 18.4 16.6 18.4 16.6 32.9 24.8 48.6 33.8 47.0 32.9 28.8 22.5 18.4 16.6 18.4 16.6 12 15.9 29.2 22.1 19.8 17.8 19.8 17.8 24.3 20.4 42.2 30.6 47.0 33.3 36.2 27.1 19.8 17.8 19.8 17.8 13 16.4 29.4 22.4 20.2 18.3 20.2 18.3 20.2 18.3 36.3 27.4 46.9 33.4 42.2 30.7 24.6 20.8 20.2 18.3 14 16.6 28.4 21.9 20.1 18.3 20.1 18.3 20.1 18.3 29.1 23.3 44.5 32.1 45.9 32.9 32.5 25.3 20.1 18.3 15 16.8 25.6 20.5 19.2 17.7 19.2 17.7 19.2 17.7 20.7 18.5 39.0 28.9 45.7 32.7 37.3 27.9 19.2 17.7 16 15.9 21.0 17.5 17.1 16.0 17.1 16.0 17.1 16.0 17.1 16.0 30.3 23.4 40.1 29.0 36.8 27.1 22.1 18.8 17 14.9 16.2 14.5 14.7 14.0 14.7 14.0 14.7 14.0 14.7 14.0 21.0 17.5 30.3 22.8 30.7 23.1 22.0 18.1 18 13.6 11.2 11.0 11.6 11.4 11.6 11.4 11.6 11.4 11.6 11.4 11.7 11.5 11.7 11.5 11.7 11.5 11.7 11.5 19 12.8 9.7 9.7 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3
20 11.9 8.9 8.9 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5 9.5
21 11.1 8.0 8.0 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6 8.6
22 10.5 7.3 7.3 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0
23 9.8 6.6 6.6 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3
24 9.5 6.3 6.3 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9
Mean: 11.7 13.6 11.4 11.2 10.6 12.0 11.0 15.2 12.9 18.3 14.6 19.6 15.3 17.1 13.9 14.2 12.2 11.7 10.9
*Hour ending (k) November 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light
01 5.2 2.6 2.6 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2
02 5.0 2.3 2.3 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8
03 4.5 2.0 2.0 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
04 4.3 1.5 1.5 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1
05 3.9 1.0 1.0 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
06 3.7 0.7 0.7 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4
07 3.7 0.6 0.6 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3
08 3.9 1.5 1.3 2.0 1.8 2.1 1.9 2.1 1.9 2.2 1.9 2.1 1.9 2.0 1.8 2.0 1.8 2.0 1.8
09 5.4 7.1 5.0 5.0 4.4 8.1 6.1 26.9 16.7 32.8 20.1 23.0 14.5 5.0 4.4 5.0 4.4 5.0 4.4
10 7.0 12.6 8.7 7.8 6.7 7.8 6.7 29.3 18.9 42.0 26.2 35.4 22.4 12.5 9.4 7.8 6.7 7.8 6.7
11 8.4 16.3 11.5 9.9 8.7 9.9 8.7 23.8 16.5 41.9 26.9 41.6 26.7 23.1 16.1 9.9 8.7 9.9 8.7
12 9.5 18.7 13.3 11.4 10.1 11.4 10.1 16.3 12.8 38.8 25.6 45.1 29.3 32.4 21.9 11.4 10.1 11.4 10.1 13 9.9 18.4 13.3 11.9 10.6 11.9 10.6 11.9 10.6 30.7 21.1 42.1 27.7 36.4 24.4 16.3 13.0 11.9 10.6 14 10.2 16.8 12.6 11.6 10.4 11.6 10.4 11.6 10.4 22.4 16.4 37.5 25.0 37.7 25.2 23.0 16.8 11.6 10.4 15 10.0 13.9 10.9 10.6 9.6 10.6 9.6 10.6 9.6 14.0 11.5 30.0 20.6 34.7 23.3 25.7 18.1 10.6 9.6
16 9.1 9.7 8.3 8.6 8.0 8.6 8.0 8.6 8.0 8.6 8.0 18.8 13.8 24.4 16.9 21.0 15.0 10.4 9.1
17 7.9 5.5 5.3 5.9 5.8 5.9 5.8 5.9 5.8 5.9 5.8 6.0 5.9 6.0 5.9 6.0 5.9 6.0 5.9
18 7.3 4.6 4.6 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1
19 6.7 4.2 4.2 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6
20 6.3 3.8 3.8 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2
21 5.9 3.4 3.4 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8
22 5.7 3.1 3.1 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6
23 5.4 2.7 2.7 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2
24 5.0 2.5 2.5 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9
Mean: 6.4 6.5 5.2 5.3 4.9 5.4 5.0 7.9 6.4 11.7 8.6 13.5 9.6 10.7 8.0 7.1 6.0 5.4 5.0
*Hour ending Table continues
Table 2.34 Air and sol-air temperatures: London area (Bracknell) (1981–1992) — continued (l) December 4
Hour* Air Sol-air temperature (/ °C) for stated orientation and surface colour temp.
Horizontal North North-east East South-east South South-west West North-west
Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light Dark Light 01 1.3 –1.9 –1.9 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 02 1.1 –2.1 –2.1 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 –1.3 03 0.7 –2.5 –2.5 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 –1.7 04 0.2 –3.2 –3.2 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 –2.4 05 0.0 –3.7 –3.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 –2.7 06 –0.2 –3.9 –3.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 07 –0.4 –3.8 –3.8 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 –3.0 08 –0.3 –3.8 –3.8 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 –2.9 09 –0.1 –2.5 –2.9 –2.0 –2.2 –1.7 –2.1 –1.7 –2.1 –1.6 –2.1 –1.7 –2.1 –2.0 –2.2 –2.0 –2.2 –2.0 –2.2
10 1.2 3.5 1.2 1.2 0.4 1.2 0.4 18.3 10.1 30.0 16.8 25.4 14.2 6.7 3.5 1.2 0.4 1.2 0.4
11 2.7 7.9 4.1 3.5 2.4 3.5 2.4 17.4 10.2 37.2 21.6 37.7 21.9 18.7 11.0 3.5 2.4 3.5 2.4
12 4.0 10.2 5.9 5.0 3.8 5.0 3.8 9.9 6.6 34.3 20.5 41.3 24.6 27.9 16.8 5.0 3.8 5.0 3.8
13 4.9 10.8 6.7 5.9 4.7 5.9 4.7 5.9 4.7 27.6 17.0 40.2 24.3 33.6 20.4 10.6 7.3 5.9 4.7
14 5.4 9.6 6.2 5.8 4.7 5.8 4.7 5.8 4.7 19.2 12.3 36.1 22.0 35.6 21.7 18.1 11.7 5.8 4.7
15 5.1 6.2 4.2 4.5 3.8 4.5 3.8 4.5 3.8 9.1 6.4 24.5 15.1 28.3 17.2 18.6 11.7 4.5 3.8
16 4.1 1.9 1.5 2.3 2.0 2.3 2.0 2.3 2.0 2.3 2.0 2.5 2.1 2.5 2.1 2.5 2.1 2.4 2.1
17 3.3 0.2 0.2 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
18 2.7 –0.5 –0.5 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
19 2.2 –0.8 –0.8 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 –0.2 20 1.8 –1.2 –1.2 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 –0.6 21 1.6 –1.5 –1.5 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 –0.8 22 1.4 –1.8 –1.8 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 –1.1 23 1.1 –1.8 –1.8 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 –1.2 24 0.7 –2.5 –2.5 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8 –1.8
Mean: 1.9 0.5 –0.3 0.2 –0.1 0.2 –0.1 1.7 0.7 5.6 3.0 7.6 4.1 5.4 2.8 1.5 0.6 0.2 –0.1
*Hour ending
Table 2.35 Air and sol-air temperatures: Manchester (Aughton) (1981–1992): refer to CD-ROM
Table 2.36 Air and sol-air temperatures: Edinburgh (Mylnefield) (1981–1992): refer to CD-ROM