Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
Minimum Temperature |
6.6 °C (-1.8) |
05:28 |
7.4 °C (-0.4) |
14.7 °C (+6.3), 2016 |
3.1 °C (-5.2), 2010 |
Maximum Temperature |
21.1 °C (+3.9) |
14:33 |
15.2 °C (-1.6) |
24.0 °C (+6.8), 2025 |
9.2 °C (-8.0), 2010 |
Mean Temperature |
14.1 °C (+1.1) |
|
11.1 °C (-1.0) |
17.7 °C, 2025 |
6.8 °C, 2010 |
Minimum Humidity |
43% |
13:45 |
54% |
80%, 2016 |
34%, 2025 |
Maximum Humidity |
82% |
06:57 |
81% |
95%, 2024 |
72%, 2020 |
Mean Humidity |
62% |
|
68% |
88%, 2016 |
54%, 2025 |
Minimum Pressure |
993 hPa |
17:50 |
1012 hPa |
1021 hPa, 2009 |
993 hPa, 2017 |
Maximum Pressure |
1001 hPa |
00:10 |
1021 hPa |
1033 hPa, 2012 |
1001 hPa, 2017 |
Mean Pressure |
995 hPa |
|
1016 hPa |
1023 hPa, 2012 |
995 hPa, 2017 |
Mean Wind Speed |
2.5 mph (-2.2) |
|
4.3 mph (-0.4) |
9.9 mph, 2014 |
2.0 mph, 2019 |
Maximum Wind Speed |
9.9 mph |
15:57 |
10.9 mph |
18.5 mph, 2013 |
8.6 mph, 2016 |
Maximum Gust |
14.7 mph |
13:24 |
17.3 mph |
30.0 mph, 2020 |
11.5 mph, 2016 |
Mean Wind Direction |
ESE |
|
|
|
|
Rainfall |
1.0 mm |
|
8.4 mm (51%) |
17.7 mm, 2016 |
|
Maximum Hourly Rain |
1.0 mm |
23:45 |
|
8.1 mm, 2016 |
|
Maximum 10-min Rain |
0.4 mm |
23:26 |
|
4.1 mm, 2016 |
|
Maximum Rain Rate |
2.0 mm/h |
23:26 |
|
54 mm/h, 2016 |
|
Minimum Dew Point |
3.0 °C |
05:03 |
3.1 °C |
9.1 °C, 2022 |
-1.5 °C, 2020 |
Maximum Dew Point |
9.4 °C |
11:07 |
7.4 °C |
18.8 °C, 2016 |
1.4 °C, 2010 |
Mean Dew Point |
6.5 °C |
|
5.2 °C |
14.4 °C, 2016 |
-0.2 °C, 2010 |
Measure | Value | Time |
Month cumul. | Record High | Record Low |
Night Minimum (21-09) |
6.6 °C |
05:28 |
7.5 °C |
14.7 °C, 2016 |
3.1 °C, 2010 |
Day Maximum (09-21) |
21.1 °C |
14:33 |
15.2 °C |
24.0 °C, 2025 |
9.2 °C, 2010 |
Max 10m Temp Rise |
0.8 °C |
07:30 |
0.6 °C |
1.0 °C, 2011 |
0.4 °C, 2010 |
Max 1hr Temp Rise |
3.1 °C |
11:28 |
1.8 °C |
4.4 °C, 2018 |
1.2 °C, 2016 |
Max 1hr Hum Rise |
14% |
23:24 |
9% |
24%, 2013 |
3%, 2016 |
Max 10m Temp Fall |
0.4 °C |
20:41 |
0.4 °C |
1.3 °C, 2013 |
0.3 °C, 2010 |
Max 1hr Temp Fall |
1.9 °C |
21:19 |
1.4 °C |
4.0 °C, 2013 |
1.2 °C, 2010 |
Max 1hr Hum Fall |
16% |
11:54 |
10% |
20%, 2018 |
9%, 2015 |
Max 10m Wind Speed |
7.0 mph |
16:44 |
8.2 mph |
13.8 mph, 2020 |
5.5 mph, 2010 |
Minimum Feels-like |
5.4 °C |
06:33 |
5.0 °C |
14.9 °C, 2016 |
-0.7 °C, 2020 |
Maximum Feels-like |
21.8 °C |
14:29 |
15.4 °C |
26.0 °C, 2024 |
7.9 °C, 2010 |
Mean Feels-like |
14.2 °C |
|
10.4 °C |
20.2 °C, 2016 |
4.9 °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 |
14.5 °C (+5.7) |
7.8 °C (-1.1) |
15.1 °C (+6.2), 2025 |
4.4 °C (-4.5), 2022 |
Humidity Range |
39% |
26% |
53%, 2012 |
14%, 2016 |
Pressure Range |
8 hPa |
8 hPa |
20 hPa, 2019 |
2 hPa, 2021 |
Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
Sun Hours |
3.3 [24%] | 43 hrs (66%) [29%] |
13 [93%], 2025 |
0.5 [4%], 2016 |
Wet Hours |
2 [Mean rain rate: 0.5 mm/h] | 7 hrs (49%) [2.7%] |
8, 2016 |
0, 2009 |
Cloud Cover |
Hazy with periods of Mostly Sunny |
Events |
None |
Comments |
22- Rain |
Extra Comments |
|
Issues |
Rn data from casa |
Observer Absent? |
Yes - observations may be unreliable |
Pond Temperature @ Hampstead Heath |
0.0 °C |