| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
6.8 °C (-0.4) |
23:58 |
8.7 °C (+1.4) |
13.7 °C (+6.5), 2025 |
2.7 °C (-4.5), 2021 |
| Maximum Temperature |
15.6 °C (-0.6) |
13:19 |
16.6 °C (+0.4) |
24.1 °C (+7.9), 2025 |
9.3 °C (-6.9), 2010 |
| Mean Temperature |
11.6 °C (-0.5) |
|
12.8 °C (+0.9) |
19.0 °C, 2025 |
7.8 °C, 2010 |
| Minimum Humidity |
36% |
15:30 |
37% |
82%, 2024 |
26%, 2013 |
| Maximum Humidity |
70% |
06:50 |
68% |
98%, 2014 |
56%, 2013 |
| Mean Humidity |
52% |
|
52% |
90%, 2024 |
39%, 2013 |
| Minimum Pressure |
1011 hPa |
11:14 |
1010 hPa |
1025 hPa, 2009 |
1000 hPa, 2024 |
| Maximum Pressure |
1014 hPa |
15:21 |
1013 hPa |
1030 hPa, 2023 |
1007 hPa, 2024 |
| Mean Pressure |
1012 hPa |
|
1012 hPa |
1028 hPa, 2023 |
1003 hPa, 2024 |
| Mean Wind Speed |
10.4 mph (+5.7) |
|
9.8 mph (+5.1) |
10.4 mph, 2011 |
0.6 mph, 2022 |
| Maximum Wind Speed |
19.7 mph |
|
19.1 mph |
19.7 mph, 2011 |
6.0 mph, 2022 |
| Maximum Gust |
32.0 mph |
15:31 |
29.6 mph |
32.0 mph, 2011 |
9.1 mph, 2022 |
| Mean Wind Direction |
ENE |
|
|
|
|
| Rainfall |
0.0 mm |
|
0.0 mm (0%) |
22.4 mm, 2010 |
|
| Maximum Hourly Rain |
n/a |
|
|
6.1, 2024 |
|
| Maximum 10-min Rain |
n/a |
|
|
5.1, 2024 |
|
| Maximum Rain Rate |
n/a |
|
|
100, 2024 |
|
| Minimum Dew Point |
-1.9 °C |
18:58 |
-0.8 °C |
9.6 °C, 2024 |
-5.4 °C, 2013 |
| Maximum Dew Point |
4.8 °C |
07:43 |
5.4 °C |
14.5 °C, 2025 |
0.8 °C, 2013 |
| Mean Dew Point |
1.5 °C |
|
2.7 °C |
11.8 °C, 2025 |
-2.6 °C, 2013 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
* 8.8 °C * |
06:20 |
9.7 °C |
15.1 °C, 2025 |
2.7 °C, 2021 |
| Day Maximum (09-21) |
15.6 °C |
13:20 |
16.6 °C |
24.1 °C, 2025 |
8.2 °C, 2010 |
| Max 10m Temp Rise |
0.5 °C |
07:21 |
0.5 °C |
1.0 °C, 2013 |
0.2 °C, 2010 |
| Max 1hr Temp Rise |
2.0 °C |
07:45 |
1.9 °C |
3.5 °C, 2009 |
0.7 °C, 2010 |
| Max 1hr Hum Rise |
9% |
19:50 |
8% |
18%, 2021 |
4%, 2010 |
| Max 10m Temp Fall |
0.3 °C |
17:50 |
0.5 °C |
2.4 °C, 2018 |
0.3 °C, 2010 |
| Max 1hr Temp Fall |
0.9 °C |
18:37 |
1.8 °C |
3.4 °C, 2020 |
0.9 °C, 2010 |
| Max 1hr Hum Fall |
8% |
09:22 |
10% |
19%, 2018 |
5%, 2024 |
| Max 10m Wind Speed |
13.9 mph |
09:36 |
13.4 mph |
14.3 mph, 2016 |
4.4 mph, 2022 |
| Minimum Feels-like |
3.3 °C |
23:10 |
6.9 °C |
14.4 °C, 2025 |
1.3 °C, 2021 |
| Maximum Feels-like |
15.6 °C |
13:15 |
16.6 °C |
27.4 °C, 2025 |
8.6 °C, 2010 |
| Mean Feels-like |
10.7 °C |
|
12.3 °C |
21.2 °C, 2025 |
6.8 °C, 2010 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
8.8 °C (-0.2) |
8.0 °C (-1.0) |
12.8 °C (+3.8), 2013 |
4.4 °C (-4.6), 2010 |
| Humidity Range |
34% |
31% |
53%, 2009 |
13%, 2024 |
| Pressure Range |
3 hPa |
3 hPa |
15 hPa, 2014 |
2 hPa, 2022 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
13 [97%] | 24 hrs (207%) [89%] |
13.4 [100%], 2013 |
0 [0%], 2010 |
| Wet Hours |
0 | 0 hrs (0%) [0%] |
11, 2010 |
0, 2009 |
| Cloud Cover |
am: Sunny
pm: Sunny or Mostly Sunny |
| Events |
Maximum possible sunshine |
| Comments |
- |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
