| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
14.4 °C (+5.1) |
03:29 |
12.9 °C (+3.2) |
14.4 °C (+5.1), 2010 |
4.7 °C (-4.6), 2022 |
| Maximum Temperature |
19.7 °C (+3.9) |
16:22 |
20.4 °C (+4.3) |
23.5 °C (+7.7), 2023 |
13.3 °C (-2.5), 2012 |
| Mean Temperature |
16.8 °C (+4.5) |
|
16.3 °C (+3.7) |
17.8 °C, 2023 |
9.2 °C, 2020 |
| Minimum Humidity |
72% |
16:46 |
53% |
81%, 2024 |
53%, 2014 |
| Maximum Humidity |
94% |
08:28 |
87% |
98%, 2012 |
80%, 2016 |
| Mean Humidity |
84% |
|
71% |
90%, 2024 |
73%, 2016 |
| Minimum Pressure |
1016 hPa |
16:19 |
1016 hPa |
1028 hPa, 2021 |
987 hPa, 2024 |
| Maximum Pressure |
1020 hPa |
00:13 |
1021 hPa |
1032 hPa, 2025 |
993 hPa, 2024 |
| Mean Pressure |
1018 hPa |
|
1019 hPa |
1029 hPa, 2021 |
988 hPa, 2024 |
| Mean Wind Speed |
7.2 mph (+3.1) |
|
5.8 mph (+1.7) |
8.1 mph, 2014 |
0.2 mph, 2021 |
| Maximum Wind Speed |
15.6 mph |
|
14.2 mph |
21.0 mph, 2014 |
4.4 mph, 2021 |
| Maximum Gust |
22.5 mph |
14:54 |
20.7 mph |
29.1 mph, 2014 |
6.8 mph, 2021 |
| Mean Wind Direction |
WSW |
|
|
|
|
| Rainfall |
1.9 mm |
|
5.8 mm (31%) |
2.8 mm, 2014 |
|
| Maximum Hourly Rain |
0.9 mm |
07:49 |
|
2.3 mm, 2014 |
|
| Maximum 10-min Rain |
0.5 mm |
07:49 |
|
1.8 mm, 2016 |
|
| Maximum Rain Rate |
2.5 mm/h |
07:49 |
|
48 mm/h, 2014 |
|
| Minimum Dew Point |
11.6 °C |
00:24 |
8.5 °C |
12.2 °C, 2023 |
2.2 °C, 2013 |
| Maximum Dew Point |
15.2 °C |
13:17 |
14.0 °C |
17.7 °C, 2023 |
8.2 °C, 2016 |
| Mean Dew Point |
13.9 °C |
|
10.6 °C |
14.5 °C, 2023 |
6.5 °C, 2016 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
14.4 °C |
03:29 |
13.0 °C |
14.8 °C, 2010 |
4.7 °C, 2022 |
| Day Maximum (09-21) |
19.7 °C |
16:21 |
20.0 °C |
23.5 °C, 2023 |
13.3 °C, 2012 |
| Max 10m Temp Rise |
0.2 °C |
11:18 |
0.5 °C |
0.9 °C, 2022 |
0.2 °C, 2010 |
| Max 1hr Temp Rise |
1.0 °C |
12:24 |
2.2 °C |
4.0 °C, 2022 |
0.6 °C, 2010 |
| Max 1hr Hum Rise |
4% |
03:31 |
8% |
14%, 2014 |
2%, 2010 |
| Max 10m Temp Fall |
0.3 °C |
17:40 |
0.3 °C |
0.7 °C, 2023 |
0.3 °C, 2010 |
| Max 1hr Temp Fall |
0.9 °C |
17:59 |
1.0 °C |
3.2 °C, 2023 |
0.8 °C, 2017 |
| Max 1hr Hum Fall |
4% |
11:10 |
9% |
19%, 2022 |
4%, 2010 |
| Max 10m Wind Speed |
10.3 mph |
22:48 |
9.3 mph |
15.7 mph, 2014 |
2.0 mph, 2021 |
| Minimum Feels-like |
16.6 °C |
02:42 |
13.6 °C |
16.8 °C, 2010 |
3.9 °C, 2009 |
| Maximum Feels-like |
23.5 °C |
16:16 |
23.0 °C |
29.3 °C, 2023 |
14.0 °C, 2012 |
| Mean Feels-like |
20.1 °C |
|
18.2 °C |
21.5 °C, 2023 |
9.1 °C, 2020 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
5.3 °C (-1.1) |
7.6 °C (+1.0) |
12.9 °C (+6.5), 2022 |
2.7 °C (-3.7), 2010 |
| Humidity Range |
22% |
34% |
45%, 2022 |
13%, 2024 |
| Pressure Range |
4 hPa |
5 hPa |
13 hPa, 2022 |
2 hPa, 2015 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
2 [20%] | 43 hrs (117%) [47%] |
10 [100%], 2018 |
0.2 [2%], 2010 |
| Wet Hours |
5
[Mean rain rate: 0.4 mm/h] | 8.1 hrs (57%) [3.8%] |
5, 2011 |
0, 2010 |
| Cloud Cover |
Overcast with periods of Mostly Cloudy |
| Events |
None |
| Comments |
02-09 broken Light Rain |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
