| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °C (°F) | 17.2 (63.0) |
21.2 (70.2) |
24.5 (76.1) |
29.4 (84.9) |
32.8 (91.0) |
35.6 (96.1) |
40.2 (104.4) |
38.1 (100.6) |
35.0 (95.0) |
29.5 (85.1) |
21.1 (70.0) |
17.4 (63.3) |
40.2 (104.4) |
| Mean daily maximum °C (°F) | 8.4 (47.1) |
9.0 (48.2) |
11.7 (53.1) |
15.0 (59.0) |
18.4 (65.1) |
21.6 (70.9) |
23.9 (75.0) |
23.4 (74.1) |
20.2 (68.4) |
15.8 (60.4) |
11.5 (52.7) |
8.8 (47.8) |
15.7 (60.3) |
| Daily mean °C (°F) | 5.6 (42.1) |
5.8 (42.4) |
7.9 (46.2) |
10.5 (50.9) |
13.7 (56.7) |
16.8 (62.2) |
19.0 (66.2) |
18.7 (65.7) |
15.9 (60.6) |
12.3 (54.1) |
8.4 (47.1) |
5.9 (42.6) |
11.7 (53.1) |
| Mean daily minimum °C (°F) | 2.7 (36.9) |
2.7 (36.9) |
4.1 (39.4) |
6.0 (42.8) |
9.1 (48.4) |
12.0 (53.6) |
14.2 (57.6) |
14.1 (57.4) |
11.6 (52.9) |
8.8 (47.8) |
5.3 (41.5) |
3.1 (37.6) |
7.8 (46.0) |
| Record low °C (°F) | −16.1 (3.0) |
−13.9 (7.0) |
−8.9 (16.0) |
−5.6 (21.9) |
−3.1 (26.4) |
−0.6 (30.9) |
3.9 (39.0) |
2.1 (35.8) |
1.4 (34.5) |
−5.5 (22.1) |
−7.1 (19.2) |
−17.4 (0.7) |
−17.4 (0.7) |
| Average precipitation mm (inches) | 58.8 (2.31) |
45.0 (1.77) |
38.8 (1.53) |
42.3 (1.67) |
45.9 (1.81) |
47.3 (1.86) |
45.8 (1.80) |
52.8 (2.08) |
49.6 (1.95) |
65.1 (2.56) |
66.6 (2.62) |
57.1 (2.25) |
615.0 (24.21) |
| Average precipitation days (≥ 1.0 mm) | 11.5 | 9.5 | 8.5 | 8.8 | 8.0 | 8.3 | 7.9 | 8.4 | 7.9 | 10.8 | 11.2 | 10.8 | 111.7 |
| Average relative humidity (%) | 80 | 77 | 70 | 65 | 67 | 65 | 65 | 69 | 73 | 78 | 81 | 81 | 73 |
| Average dew point °C (°F) | 3 (37) |
2 (36) |
2 (36) |
4 (39) |
7 (45) |
10 (50) |
12 (54) |
12 (54) |
10 (50) |
9 (48) |
6 (43) |
3 (37) |
7 (44) |
| Mean monthly sunshine hours | 61.1 | 78.8 | 124.5 | 176.7 | 207.5 | 208.4 | 217.8 | 202.1 | 157.1 | 115.2 | 70.7 | 55.0 | 1,674.8 |
| Percent possible sunshine | 23 | 28 | 31 | 40 | 41 | 41 | 42 | 45 | 40 | 35 | 27 | 21 | 35 |
| Average ultraviolet index | 1 | 1 | 2 | 4 | 5 | 6 | 6 | 5 | 4 | 2 | 1 | 0 | 3 |
| Source 1: Met Office[1][2][3] Royal Netherlands Meteorological Institute[4][5] | |||||||||||||
| Source 2: Weather Atlas (percent sunshine and UV Index)[6] CEDA Archive[7] TORRO[8] Time and Date[9]
See Climate of London for additional climate information. | |||||||||||||
- ^ Averages are taken from Heathrow, and extremes are taken from stations across London.
References
- ^ "London Heathrow Airport". Met Office. Retrieved 17 December 2021.
- ^ "Station Data". Met Office. Retrieved 8 May 2020.
- ^ "UK Climate Extremes". Met Office. Retrieved 3 July 2021.
- ^ "Heathrow Airport Extreme Values". KNMI. Retrieved 29 November 2015.
- ^ "Heathrow 1981–2010 mean maximum and minimum values". KNMI. Retrieved 28 December 2017.
- ^ "London, United Kingdom – Climate data". Weather Atlas. Retrieved 11 March 2020.
- ^ "MIDAS Open: UK daily temperature data, v202007". CEDA Archive. Retrieved 3 July 2021.
- ^ "Maximum temperature date records". TORRO. Retrieved 3 July 2021.
- ^ "Climate & Weather Averages in London, England, United Kingdom". Time and Date. Retrieved 9 January 2022.