| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
11.2 °C (-1.0) |
06:03 |
10.6 °C (-1.0) |
18.8 °C (+6.6), 2017 |
10.9 °C (-1.3), 2010 |
| Maximum Temperature |
17.5 °C (-3.7) |
16:22 |
19.1 °C (-1.3) |
31.8 °C (+10.6), 2017 |
16.2 °C (-5.0), 2021 |
| Mean Temperature |
14.1 °C (-2.3) |
|
14.8 °C (-1.2) |
25.9 °C, 2017 |
13.9 °C, 2010 |
| Minimum Humidity |
54% |
16:00 |
50% |
92%, 2021 |
36%, 2025 |
| Maximum Humidity |
95% |
00:45 |
87% |
96%, 2021 |
74%, 2017 |
| Mean Humidity |
76% |
|
70% |
94%, 2021 |
54%, 2017 |
| Minimum Pressure |
996 hPa |
00:57 |
1011 hPa |
1025 hPa, 2025 |
996 hPa, 2011 |
| Maximum Pressure |
1005 hPa |
23:31 |
1017 hPa |
1028 hPa, 2025 |
1005 hPa, 2011 |
| Mean Pressure |
1000 hPa |
|
1014 hPa |
1026 hPa, 2025 |
1000 hPa, 2011 |
| Mean Wind Speed |
7.6 mph (+3.2) |
|
5.1 mph (+0.7) |
7.8 mph, 2018 |
1.1 mph, 2017 |
| Maximum Wind Speed |
16.6 mph |
|
13.9 mph |
16.6 mph, 2011 |
5.7 mph, 2017 |
| Maximum Gust |
25.9 mph |
16:00 |
20.0 mph |
26.2 mph, 2022 |
8.4 mph, 2017 |
| Mean Wind Direction |
WSW |
|
|
|
|
| Rainfall |
1.1 mm |
|
64.1 mm (227%) |
20.7 mm, 2020 |
|
| Maximum Hourly Rain |
0.5 mm |
17:54 |
|
6.0 mm, 2021 |
|
| Maximum 10-min Rain |
n/a |
13:33 |
|
2.5, 2020 |
|
| Maximum Rain Rate |
n/a |
13:33 |
|
30, 2012 |
|
| Minimum Dew Point |
7.7 °C |
16:04 |
6.1 °C |
13.8 °C, 2017 |
4.7 °C, 2015 |
| Maximum Dew Point |
11.9 °C |
01:11 |
11.7 °C |
19.6 °C, 2023 |
11.2 °C, 2012 |
| Mean Dew Point |
9.8 °C |
|
9.0 °C |
16.4 °C, 2023 |
8.2 °C, 2009 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
11.2 °C |
06:00 |
10.8 °C |
18.8 °C, 2017 |
10.9 °C, 2010 |
| Day Maximum (09-21) |
17.5 °C |
15:45 |
19.1 °C |
31.8 °C, 2017 |
14.4 °C, 2021 |
| Max 10m Temp Rise |
0.5 °C |
10:38 |
0.6 °C |
0.8 °C, 2013 |
0.3 °C, 2021 |
| Max 1hr Temp Rise |
1.7 °C |
09:03 |
2.5 °C |
2.9 °C, 2023 |
0.4 °C, 2021 |
| Max 1hr Hum Rise |
17% |
18:00 |
10% |
17%, 2011 |
2%, 2021 |
| Max 10m Temp Fall |
0.4 °C |
13:37 |
0.6 °C |
1.1 °C, 2022 |
0.3 °C, 2009 |
| Max 1hr Temp Fall |
1.8 °C |
17:55 |
1.8 °C |
3.3 °C, 2025 |
0.8 °C, 2021 |
| Max 1hr Hum Fall |
7% |
15:39 |
10% |
16%, 2009 |
2%, 2021 |
| Max 10m Wind Speed |
12.8 mph |
16:08 |
9.3 mph |
12.8 mph, 2011 |
3.7 mph, 2017 |
| Minimum Feels-like |
12.4 °C |
06:01 |
10.3 °C |
22.1 °C, 2017 |
10.9 °C, 2010 |
| Maximum Feels-like |
18.5 °C |
15:46 |
20.4 °C |
36.7 °C, 2017 |
18.2 °C, 2016 |
| Mean Feels-like |
15.3 °C |
|
15.8 °C |
30.3 °C, 2017 |
15.1 °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 |
6.3 °C (-2.7) |
8.6 °C (-0.3) |
13.6 °C (+4.6), 2025 |
4.1 °C (-4.9), 2016 |
| Humidity Range |
41% |
37% |
47%, 2018 |
4%, 2021 |
| Pressure Range |
9 hPa |
6 hPa |
11 hPa, 2016 |
2 hPa, 2010 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
3.5 [23%] | 103 hrs (89%) [38%] |
14.9 [99%], 2025 |
0 [0%], 2021 |
| Wet Hours |
1.5
[Mean rain rate: 0.7 mm/h] | 47 hrs (213%) [11%] |
13, 2020 |
0, 2009 |
| Cloud Cover |
Mostly Cloudy |
| Events |
Thunder |
| Comments |
12,1330,16-18,21 Light-Heavy Showers, s. with Thunder |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
