Daily Data Tables - Night Minimum (21-09) / °C · Min (all years)
Day
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1
-6.8
-6.4
-5.1
-1.3
1.5
3.4
8.9
8.1
6.3
3.5
-1.1
-2.5
2
-6.1
-8.1
-4.0
-1.3
0.5
2.8
8.9
7.3
8.1
3.4
-1.1
-1.9
3
-5.4
-6.4
-5.7
-1.8
-0.1
4.5
9.1
8.9
7.9
3.1
-2.9
-4.7
4
-4.2
-7.0
-3.2
-1.2
1.0
4.6
7.8
9.5
5.0
2.3
0.0
-3.5
5
-4.2
-5.9
-3.2
-1.9
0.2
4.5
7.3
9.5
6.7
2.2
-1.8
-3.7
6
-5.2
-5.3
-4.0
-2.3
2.6
6.2
7.3
9.4
5.6
2.6
-0.5
-4.7
7
-5.3
-6.9
-3.7
-1.7
0.1
6.5
7.3
7.8
5.7
2.5
-0.6
-3.1
8
-6.3
-6.4
-3.5
-1.8
3.2
4.6
8.9
8.9
5.6
2.7
-0.4
-3.2
9
-4.5
-5.4
-4.0
-1.4
2.0
5.7
8.9
8.4
6.2
3.0
-0.5
-5.9
10
-5.7
-8.6
-2.4
-1.8
2.5
5.1
7.4
8.9
5.5
2.0
-1.1
-2.4
11
-5.7
-8.1
-2.4
-1.4
1.5
6.2
7.6
8.0
6.3
2.1
0.1
-3.9
12
-9.3
-5.7
-4.0
0.3
1.0
6.1
7.8
10.1
6.2
1.7
-1.6
-5.1
13
-9.3
-5.7
-3.1
-0.9
1.3
5.6
8.2
8.2
6.1
0.6
-3.0
-7.3
14
-6.3
-5.2
-2.4
-1.6
3.0
7.3
10.1
8.7
5.4
1.9
-3.4
-4.2
15
-4.4
-5.0
-4.6
-0.7
2.3
4.5
8.9
8.9
6.2
1.2
-3.3
-5.1
16
-5.7
-3.6
-1.8
0.0
2.2
7.3
8.4
7.8
5.6
0.1
-2.2
-3.8
17
-6.2
-4.2
-2.4
-0.3
3.6
7.4
8.9
8.9
5.0
-0.1
-1.7
-4.4
18
-6.1
-2.5
-2.0
0.4
1.5
6.7
8.9
7.8
3.9
1.2
-2.4
-6.0
19
-5.9
-4.8
-1.6
0.1
2.6
7.5
9.6
8.4
1.7
0.8
-1.9
-4.5
20
-5.3
-5.9
-4.0
-0.7
2.6
6.2
9.6
6.7
3.9
1.3
-2.5
-7.2
21
-3.1
-5.7
-2.4
-1.5
3.7
7.3
8.4
7.7
6.2
-0.4
-1.9
-4.2
22
-5.9
-5.8
-3.9
1.2
3.2
7.5
7.8
8.4
4.5
1.7
-2.6
-3.1
23
-9.2
-4.2
-1.8
0.5
3.8
5.6
7.8
8.4
3.9
1.7
-4.1
-4.1
24
-8.1
-3.6
-1.3
1.0
5.4
7.6
8.4
6.2
4.7
-1.6
-3.2
-5.9
25
-8.1
-5.9
-2.9
-0.1
4.9
8.2
8.9
7.1
4.4
-1.1
-2.7
-4.2
26
-7.5
-4.7
-1.3
-0.1
5.1
8.9
8.9
8.6
6.0
0.1
-3.5
-5.9
27
-5.3
-4.1
-5.0
0.8
5.4
7.2
10.1
8.0
5.1
0.6
-3.5
-5.9
28
-5.3
-4.9
-1.3
0.1
4.3
7.5
9.5
6.5
3.4
-2.2
-5.0
-5.9
29
-4.2
-0.1
-1.3
1.3
3.7
7.4
9.6
6.8
4.4
-1.1
-3.3
-5.9
30
-4.3
-0.8
1.8
4.1
7.8
8.9
8.4
2.3
-2.0
-3.3
-4.8
31
-6.8
-2.9
3.7
8.5
6.7
-0.8
-4.5
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Lowest
-9.3
-8.6
-5.7
-2.3
-0.1
2.8
7.3
6.2
1.7
-2.2
-5.0
-7.3
Highest
-3.1
-0.1
-0.8
1.8
5.4
8.9
10.1
10.1
8.1
3.5
0.1
-1.9
Mean
-6.0
-5.4
-3.0
-0.5
2.7
6.3
8.6
8.2
5.3
1.1
-2.2
-4.6
Cumul
-6.0
-5.7
-4.8
-3.7
-2.4
-1.0
0.4
1.4
1.8
1.7
1.4
0.9
Night Minimum (21-09) in London, NW3 — calendar-day minimum across all years from 1950 onwards along with monthly summary: lowest, highest, mean, and the cumulative value for the year to the month's end.
*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.
Lowest air temperature overnight, from 21:00 to 09:00 local time.