| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
8.1 °C (+5.1) |
05:35 |
5.6 °C (+2.6) |
9.7 °C (+6.7), 2011 |
-0.8 °C (-3.8), 2018 |
| Maximum Temperature |
10.8 °C (+3.0) |
14:48 |
9.1 °C (+1.2) |
13.8 °C (+6.0), 2024 |
1.1 °C (-6.7), 2009 |
| Mean Temperature |
8.9 °C (+4.1) |
|
7.1 °C (+1.9) |
12.1 °C, 2024 |
0.7 °C, 2009 |
| Minimum Humidity |
91% |
20:12 |
83% |
91%, 2026 |
54%, 2015 |
| Maximum Humidity |
96% |
02:05 |
95% |
98%, 2009 |
84%, 2011 |
| Mean Humidity |
94% |
|
91% |
96%, 2010 |
72%, 2015 |
| Minimum Pressure |
983 hPa |
03:07 |
990 hPa |
1040 hPa, 2023 |
980 hPa, 2014 |
| Maximum Pressure |
994 hPa |
23:56 |
995 hPa |
1046 hPa, 2023 |
992 hPa, 2009 |
| Mean Pressure |
987 hPa |
|
992 hPa |
1043 hPa, 2023 |
987 hPa, 2026 |
| Mean Wind Speed |
4.6 mph (-0.5) |
|
5.5 mph (+0.5) |
12.9 mph, 2022 |
0.9 mph, 2012 |
| Maximum Wind Speed |
11.5 mph |
17:29 |
13.5 mph |
25.9 mph, 2016 |
5.9 mph, 2012 |
| Maximum Gust |
18.4 mph |
03:46 |
21.5 mph |
38.8 mph, 2022 |
7.4 mph, 2012 |
| Mean Wind Direction |
S |
|
|
|
|
| Rainfall |
9.0 mm |
|
32.2 mm (334%) |
9.0 mm, 2026 |
|
| Maximum Hourly Rain |
3.2 mm |
17:06 |
|
4.6 mm, 2024 |
|
| Maximum 10-min Rain |
1.4 mm |
16:57 |
|
2.0 mm, 2024 |
|
| Maximum Rain Rate |
14 mm/h |
16:49 |
|
20 mm/h, 2016 |
|
| Minimum Dew Point |
6.9 °C |
23:48 |
4.3 °C |
6.9 °C, 2026 |
-4.5 °C, 2018 |
| Maximum Dew Point |
9.8 °C |
14:14 |
7.3 °C |
10.6 °C, 2024 |
-1.5 °C, 2015 |
| Mean Dew Point |
8.0 °C |
|
5.7 °C |
9.2 °C, 2024 |
-2.8 °C, 2015 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
8.1 °C |
06:46 |
6.0 °C |
10.8 °C, 2024 |
-0.1 °C, 2015 |
| Day Maximum (09-21) |
10.8 °C |
14:48 |
8.7 °C |
13.8 °C, 2024 |
1.1 °C, 2009 |
| Max 10m Temp Rise |
0.4 °C |
11:58 |
0.3 °C |
0.9 °C, 2023 |
0.2 °C, 2009 |
| Max 1hr Temp Rise |
1.0 °C |
12:16 |
0.8 °C |
2.8 °C, 2023 |
0.3 °C, 2009 |
| Max 1hr Hum Rise |
3% |
16:32 |
5% |
13%, 2016 |
3%, 2009 |
| Max 10m Temp Fall |
0.3 °C |
15:39 |
0.3 °C |
2.8 °C, 2024 |
0.2 °C, 2011 |
| Max 1hr Temp Fall |
0.7 °C |
16:07 |
0.9 °C |
6.2 °C, 2024 |
0.5 °C, 2019 |
| Max 1hr Hum Fall |
2% |
13:32 |
4% |
13%, 2013 |
1%, 2014 |
| Max 10m Wind Speed |
8.3 mph |
03:38 |
10.1 mph |
20.5 mph, 2016 |
3.8 mph, 2012 |
| Minimum Feels-like |
4.3 °C |
03:46 |
1.7 °C |
6.3 °C, 2011 |
-5.9 °C, 2015 |
| Maximum Feels-like |
11.9 °C |
14:26 |
8.7 °C |
15.1 °C, 2024 |
1.1 °C, 2018 |
| Mean Feels-like |
7.6 °C |
|
5.0 °C |
12.9 °C, 2024 |
-2.5 °C, 2015 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
4 hrs, 2018 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
2.7 °C (-2.1) |
3.4 °C (-1.4) |
8.7 °C (+3.9), 2024 |
0.8 °C (-4.0), 2009 |
| Humidity Range |
5% |
12% |
41%, 2023 |
5%, 2026 |
| Pressure Range |
10 hPa |
5 hPa |
24 hPa, 2013 |
1 hPa, 2011 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
0 [0%] | 2.6 hrs (17%) [5.2%] |
8.4 [100%], 2023 |
0 [0%], 2009 |
| Wet Hours |
10 [Mean rain rate: 0.9 mm/h] | 40 hrs (359%) [28%] |
11, 2014 |
, 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 |
7.5 °C |