| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
4.9 °C (+2.2) |
07:05 |
5.5 °C (+2.6) |
10.0 °C (+7.2), 2024 |
-2.1 °C (-4.8), 2016 |
| Maximum Temperature |
9.1 °C (+1.0) |
13:46 |
9.4 °C (+1.5) |
14.7 °C (+6.6), 2022 |
4.4 °C (-3.7), 2010 |
| Mean Temperature |
6.3 °C (+1.6) |
|
7.3 °C (+2.0) |
12.4 °C, 2022 |
3.0 °C, 2016 |
| Minimum Humidity |
71% |
13:24 |
80% |
94%, 2010 |
48%, 2013 |
| Maximum Humidity |
90% |
04:30 |
94% |
98%, 2010 |
83%, 2012 |
| Mean Humidity |
84% |
|
89% |
96%, 2010 |
66%, 2013 |
| Minimum Pressure |
995 hPa |
04:51 |
991 hPa |
1028 hPa, 2017 |
991 hPa, 2010 |
| Maximum Pressure |
1007 hPa |
23:54 |
1000 hPa |
1035 hPa, 2016 |
998 hPa, 2010 |
| Mean Pressure |
999 hPa |
|
995 hPa |
1032 hPa, 2016 |
994 hPa, 2010 |
| Mean Wind Speed |
6.7 mph (+1.6) |
|
5.0 mph (-0.1) |
12.7 mph, 2022 |
1.9 mph, 2013 |
| Maximum Wind Speed |
17.3 mph |
13:35 |
13.5 mph |
29.7 mph, 2020 |
6.7 mph, 2013 |
| Maximum Gust |
30.0 mph |
13:36 |
20.7 mph |
49.5 mph, 2020 |
8.7 mph, 2013 |
| Mean Wind Direction |
WNW |
|
|
|
|
| Rainfall |
1.0 mm |
|
77.0 mm (299%) |
27.0 mm, 2010 |
|
| Maximum Hourly Rain |
0.6 mm |
14:07 |
|
3.6 mm, 2010 |
|
| Maximum 10-min Rain |
0.4 mm |
13:57 |
|
2.2 mm, 2020 |
|
| Maximum Rain Rate |
1.4 mm/h |
14:07 |
|
42 mm/h, 2020 |
|
| Minimum Dew Point |
1.6 °C |
23:59 |
3.7 °C |
7.5 °C, 2024 |
-4.0 °C, 2016 |
| Maximum Dew Point |
4.9 °C |
13:58 |
7.3 °C |
12.4 °C, 2022 |
1.0 °C, 2025 |
| Mean Dew Point |
3.7 °C |
|
5.5 °C |
10.3 °C, 2022 |
-1.2 °C, 2016 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
4.9 °C |
07:05 |
5.8 °C |
10.3 °C, 2020 |
-2.1 °C, 2016 |
| Day Maximum (09-21) |
9.1 °C |
13:46 |
9.3 °C |
14.7 °C, 2022 |
4.4 °C, 2010 |
| Max 10m Temp Rise |
0.4 °C |
10:42 |
0.3 °C |
0.6 °C, 2009 |
0.2 °C, 2010 |
| Max 1hr Temp Rise |
1.3 °C |
09:58 |
1.0 °C |
2.4 °C, 2016 |
0.4 °C, 2021 |
| Max 1hr Hum Rise |
11% |
16:41 |
5% |
12%, 2018 |
2%, 2010 |
| Max 10m Temp Fall |
1.4 °C |
14:05 |
0.4 °C |
1.4 °C, 2026 |
0.2 °C, 2012 |
| Max 1hr Temp Fall |
2.0 °C |
16:51 |
1.1 °C |
2.4 °C, 2013 |
0.6 °C, 2017 |
| Max 1hr Hum Fall |
8% |
10:28 |
5% |
19%, 2014 |
2%, 2010 |
| Max 10m Wind Speed |
14.3 mph |
13:43 |
9.9 mph |
21.3 mph, 2020 |
5.2 mph, 2013 |
| Minimum Feels-like |
0.1 °C |
07:25 |
1.8 °C |
10.7 °C, 2024 |
-4.0 °C, 2016 |
| Maximum Feels-like |
6.7 °C |
15:55 |
9.2 °C |
16.7 °C, 2022 |
2.8 °C, 2025 |
| Mean Feels-like |
3.2 °C |
|
5.4 °C |
13.5 °C, 2022 |
-0.5 °C, 2025 |
| Air-frost Hrs |
0 hrs |
|
0.0 hrs |
4 hrs, 2016 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
4.2 °C (-1.2) |
3.9 °C (-1.1) |
9.1 °C (+3.7), 2016 |
2.5 °C (-2.9), 2021 |
| Humidity Range |
19% |
14% |
41%, 2018 |
4%, 2010 |
| Pressure Range |
12 hPa |
10 hPa |
20 hPa, 2024 |
1 hPa, 2009 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
0 [0%] | 5.3 hrs (12%) [3.8%] |
8.5 [95%], 2016 |
0 [0%], 2010 |
| Wet Hours |
2 [Mean rain rate: 0.5 mm/h] | 75 hrs (252%) [20%] |
17, 2010 |
, 2009 |
| Cloud Cover |
unknown |
| Events |
None |
| 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 |
5.0 °C |