Daily Data Tables - Day Maximum (09-21) / °C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Lowest
-0.8
2.5
2.5
8.6
10.9
15.5
16.6
18.3
13.5
10.2
5.2
2.0
Highest
11.4
12.0
13.1
16.4
25.9
27.2
27.7
30.0
24.7
19.7
13.0
11.4
Mean
8.1
8.9
7.5
13.0
17.0
20.2
20.9
23.5
18.7
14.7
8.4
5.9
Cumul
8.1
8.5
8.1
9.4
10.9
12.5
13.7
15.0
15.4
15.3
14.7
13.9
Day Maximum (09-21) in London, NW3, for every available day of 1937 along with monthly summary: lowest, highest, mean, and the cumulative value for the year to the month's end. Data for Day Maximum (09-21) begins in 1881.
*Data from before 2009 are mostly from the historical site at Whitestone Pond in Hampstead. Where data from that record is missing, other nearby sites were used, including St James Park, Heathrow, and Kew Gardens (pre-1910). Best efforts have been made to adjust for site differences, but uncertainties are somewhat greater for this data. I am grateful to the Met Office for making this data available for free through the MIDAS Open database.
Highest air temperature during the daytime window 09:00 to 21:00 local time.