| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
8.0 °C (-1.2) |
07:48 |
9.5 °C (-0.1) |
15.8 °C (+6.6), 2011 |
4.9 °C (-4.3), 2012 |
| Maximum Temperature |
17.0 °C (+1.3) |
14:24 |
17.0 °C (+0.9) |
22.7 °C (+7.0), 2023 |
11.7 °C (-4.0), 2013 |
| Mean Temperature |
12.8 °C (+0.0) |
|
13.4 °C (+0.4) |
17.8 °C, 2023 |
8.8 °C, 2013 |
| Minimum Humidity |
62% |
14:15 |
60% |
77%, 2017 |
47%, 2010 |
| Maximum Humidity |
97% |
09:08 |
95% |
98%, 2009 |
73%, 2013 |
| Mean Humidity |
85% |
|
81% |
88%, 2021 |
66%, 2013 |
| Minimum Pressure |
1005 hPa |
00:00 |
1007 hPa |
1032 hPa, 2025 |
993 hPa, 2024 |
| Maximum Pressure |
1011 hPa |
21:42 |
1016 hPa |
1036 hPa, 2025 |
1011 hPa, 2014 |
| Mean Pressure |
1009 hPa |
|
1011 hPa |
1035 hPa, 2025 |
1006 hPa, 2024 |
| Mean Wind Speed |
3.9 mph (-0.2) |
|
4.3 mph (+0.2) |
10.8 mph, 2011 |
0.6 mph, 2025 |
| Maximum Wind Speed |
14.7 mph |
13:34 |
13.4 mph |
21.5 mph, 2011 |
3.9 mph, 2025 |
| Maximum Gust |
19.7 mph |
14:21 |
19.2 mph |
37.7 mph, 2011 |
6.9 mph, 2025 |
| Mean Wind Direction |
SW |
|
|
|
|
| Rainfall |
3.3 mm |
|
25.2 mm (120%) |
4.6 mm, 2022 |
|
| Maximum Hourly Rain |
3.1 mm |
15:13 |
|
4.4 mm, 2022 |
|
| Maximum 10-min Rain |
2.8 mm |
15:11 |
|
2.8 mm, 2014 |
|
| Maximum Rain Rate |
48 mm/h |
15:09 |
|
48 mm/h, 2014 |
|
| Minimum Dew Point |
7.2 °C |
07:48 |
6.8 °C |
12.2 °C, 2023 |
1.7 °C, 2013 |
| Maximum Dew Point |
12.9 °C |
10:38 |
13.2 °C |
16.9 °C, 2023 |
4.5 °C, 2013 |
| Mean Dew Point |
10.3 °C |
|
10.0 °C |
14.7 °C, 2023 |
2.8 °C, 2013 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
8.0 °C |
07:48 |
10.2 °C |
15.8 °C, 2011 |
4.9 °C, 2012 |
| Day Maximum (09-21) |
17.0 °C |
14:24 |
17.0 °C |
22.7 °C, 2023 |
11.4 °C, 2024 |
| Max 10m Temp Rise |
0.7 °C |
10:09 |
0.5 °C |
0.9 °C, 2012 |
0.2 °C, 2025 |
| Max 1hr Temp Rise |
3.1 °C |
10:23 |
1.9 °C |
3.8 °C, 2012 |
0.5 °C, 2025 |
| Max 1hr Hum Rise |
15% |
15:58 |
10% |
15%, 2014 |
3%, 2017 |
| Max 10m Temp Fall |
1.1 °C |
15:10 |
0.6 °C |
1.1 °C, 2014 |
0.2 °C, 2015 |
| Max 1hr Temp Fall |
2.5 °C |
15:28 |
1.9 °C |
3.0 °C, 2022 |
0.7 °C, 2017 |
| Max 1hr Hum Fall |
13% |
11:57 |
12% |
24%, 2010 |
3%, 2025 |
| Max 10m Wind Speed |
10.3 mph |
14:13 |
9.9 mph |
14.6 mph, 2011 |
2.6 mph, 2025 |
| Minimum Feels-like |
7.1 °C |
08:43 |
9.3 °C |
18.1 °C, 2011 |
1.4 °C, 2020 |
| Maximum Feels-like |
18.4 °C |
14:43 |
19.3 °C |
27.8 °C, 2023 |
11.7 °C, 2013 |
| Mean Feels-like |
14.2 °C |
|
14.9 °C |
21.6 °C, 2023 |
7.2 °C, 2013 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
9.0 °C (+2.6) |
7.5 °C (+1.0) |
11.7 °C (+5.3), 2018 |
2.2 °C (-4.2), 2025 |
| Humidity Range |
35% |
35% |
49%, 2010 |
8%, 2025 |
| Pressure Range |
6 hPa |
9 hPa |
21 hPa, 2024 |
2 hPa, 2020 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
5 [50%] | 47 hrs (114%) [46%] |
10 [101%], 2018 |
0 [0%], 2025 |
| Wet Hours |
0.7 [Mean rain rate: 4.7 mm/h] | 20 hrs (125%) [8.2%] |
3, 2024 |
0, 2010 |
| Cloud Cover |
Sunny with periods of Partly Cloudy |
| Events |
None |
| Comments |
15 Heavy Shower |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
0.0 °C |