| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
8.7 °C (+5.3) |
06:57 |
8.2 °C (+4.8) |
8.7 °C (+5.3), 2026 |
-1.8 °C (-5.2), 2018 |
| Maximum Temperature |
15.9 °C (+6.3) |
14:15 |
14.4 °C (+4.8) |
15.9 °C (+6.3), 2026 |
-0.1 °C (-9.7), 2018 |
| Mean Temperature |
11.7 °C (+5.8) |
|
10.9 °C (+4.8) |
11.7 °C, 2026 |
-1.3 °C, 2018 |
| Minimum Humidity |
60% |
13:49 |
68% |
85%, 2022 |
34%, 2017 |
| Maximum Humidity |
82% |
23:45 |
86% |
97%, 2012 |
71%, 2017 |
| Mean Humidity |
74% |
|
79% |
90%, 2022 |
55%, 2017 |
| Minimum Pressure |
1014 hPa |
05:29 |
1014 hPa |
1035 hPa, 2011 |
982 hPa, 2014 |
| Maximum Pressure |
1022 hPa |
23:47 |
1021 hPa |
1038 hPa, 2011 |
995 hPa, 2018 |
| Mean Pressure |
1016 hPa |
|
1016 hPa |
1036 hPa, 2011 |
991 hPa, 2020 |
| Mean Wind Speed |
6.1 mph (+0.9) |
|
7.0 mph (+1.8) |
11.1 mph, 2018 |
1.2 mph, 2025 |
| Maximum Wind Speed |
14.6 mph |
00:23 |
16.8 mph |
22.0 mph, 2018 |
7.1 mph, 2010 |
| Maximum Gust |
24.2 mph |
00:23 |
26.5 mph |
37.0 mph, 2009 |
9.0 mph, 2010 |
| Mean Wind Direction |
SW |
|
|
|
|
| Rainfall |
0.0 mm |
|
0.0 mm (0%) |
8.6 mm, 2014 |
|
| Maximum Hourly Rain |
n/a |
|
|
3.1, 2014 |
|
| Maximum 10-min Rain |
n/a |
|
|
1, 2024 |
|
| Maximum Rain Rate |
n/a |
|
|
18, 2020 |
|
| Minimum Dew Point |
5.6 °C |
06:57 |
5.0 °C |
5.6 °C, 2026 |
-6.0 °C, 2015 |
| Maximum Dew Point |
8.5 °C |
15:26 |
9.2 °C |
9.8 °C, 2019 |
-1.2 °C, 2013 |
| Mean Dew Point |
7.0 °C |
|
7.2 °C |
7.9 °C, 2019 |
-3.5 °C, 2018 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
8.7 °C |
07:01 |
7.7 °C |
8.7 °C, 2026 |
-1.7 °C, 2018 |
| Day Maximum (09-21) |
15.9 °C |
14:08 |
14.4 °C |
15.9 °C, 2026 |
-0.6 °C, 2018 |
| Max 10m Temp Rise |
0.4 °C |
08:05 |
0.4 °C |
0.9 °C, 2025 |
0.2 °C, 2013 |
| Max 1hr Temp Rise |
1.7 °C |
09:00 |
1.5 °C |
3.4 °C, 2025 |
0.6 °C, 2013 |
| Max 1hr Hum Rise |
4% |
17:13 |
6% |
20%, 2020 |
3%, 2022 |
| Max 10m Temp Fall |
0.3 °C |
16:48 |
0.3 °C |
1.2 °C, 2020 |
0.2 °C, 2012 |
| Max 1hr Temp Fall |
1.3 °C |
17:42 |
1.1 °C |
2.6 °C, 2025 |
0.4 °C, 2018 |
| Max 1hr Hum Fall |
7% |
11:32 |
9% |
19%, 2016 |
3%, 2013 |
| Max 10m Wind Speed |
10.5 mph |
00:16 |
11.8 mph |
17.3 mph, 2018 |
4.5 mph, 2025 |
| Minimum Feels-like |
5.5 °C |
06:14 |
4.8 °C |
5.5 °C, 2026 |
-10.6 °C, 2018 |
| Maximum Feels-like |
16.5 °C |
14:10 |
15.1 °C |
16.5 °C, 2026 |
-3.4 °C, 2018 |
| Mean Feels-like |
11.0 °C |
|
10.2 °C |
11.0 °C, 2026 |
-7.8 °C, 2018 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
24 hrs, 2018 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
7.2 °C (+1.1) |
6.2 °C (-0.0) |
10.8 °C (+4.7), 2009 |
1.5 °C (-4.7), 2022 |
| Humidity Range |
22% |
19% |
48%, 2015 |
10%, 2022 |
| Pressure Range |
8 hPa |
7 hPa |
19 hPa, 2014 |
3 hPa, 2021 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
9.5 [97%] | 9.7 hrs (145%) [49%] |
10 [102%], 2010 |
0 [0%], 2018 |
| Wet Hours |
0 | 0 hrs (0%) [0%] |
9, 2022 |
, 2009 |
| Cloud Cover |
unknown |
| Events |
Maximum possible sunshine |
| Comments |
data is awaiting quality control from site operator |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
9.4 °C |