Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
Minimum Temperature |
2.4 °C (-1.9) |
04:59 |
2.3 °C (-1.6) |
9.3 °C (+5.0), 2019 |
-0.7 °C (-5.0), 2023 |
Maximum Temperature |
8.6 °C (-2.3) |
13:22 |
9.0 °C (-1.3) |
17.2 °C (+6.3), 2014 |
6.8 °C (-4.1), 2015 |
Mean Temperature |
6.1 °C (-2.1) |
|
5.6 °C (-1.5) |
12.4 °C, 2024 |
4.1 °C, 2025 |
Minimum Humidity |
71% |
00:05 |
58% |
77%, 2011 |
32%, 2014 |
Maximum Humidity |
89% |
23:13 |
89% |
98%, 2011 |
79%, 2014 |
Mean Humidity |
84% |
|
76% |
91%, 2011 |
58%, 2014 |
Minimum Pressure |
1028 hPa |
13:08 |
1008 hPa |
1028 hPa, 2016 |
988 hPa, 2018 |
Maximum Pressure |
1031 hPa |
05:30 |
1018 hPa |
1036 hPa, 2017 |
993 hPa, 2018 |
Mean Pressure |
1030 hPa |
|
1013 hPa |
1033 hPa, 2017 |
991 hPa, 2018 |
Mean Wind Speed |
3.2 mph (-2.0) |
|
4.5 mph (-0.7) |
11.3 mph, 2019 |
1.8 mph, 2017 |
Maximum Wind Speed |
9.6 mph |
20:37 |
11.2 mph |
24.1 mph, 2019 |
7.7 mph, 2017 |
Maximum Gust |
19.5 mph |
20:35 |
18.9 mph |
47.2 mph, 2019 |
10.5 mph, 2017 |
Mean Wind Direction |
NNE |
|
|
|
|
Rainfall |
0.0 mm |
|
26.7 mm (141%) |
4.8 mm, 2018 |
|
Maximum Hourly Rain |
n/a |
|
|
1.5, 2018 |
|
Maximum 10-min Rain |
n/a |
|
|
0.6, 2013 |
|
Maximum Rain Rate |
n/a |
|
|
7.2, 2024 |
|
Minimum Dew Point |
-1.3 °C |
00:05 |
-1.8 °C |
7.3 °C, 2019 |
-5.4 °C, 2013 |
Maximum Dew Point |
5.6 °C |
13:49 |
4.9 °C |
11.8 °C, 2024 |
1.3 °C, 2025 |
Mean Dew Point |
3.5 °C |
|
1.5 °C |
9.9 °C, 2024 |
-1.6 °C, 2025 |
Measure | Value | Time |
Month cumul. | Record High | Record Low |
Night Minimum (21-09) |
2.4 °C |
04:59 |
2.6 °C |
11.4 °C, 2024 |
-0.7 °C, 2023 |
Day Maximum (09-21) |
8.6 °C |
13:22 |
8.9 °C |
17.2 °C, 2014 |
6.8 °C, 2015 |
Max 10m Temp Rise |
0.4 °C |
07:22 |
0.5 °C |
0.9 °C, 2012 |
0.2 °C, 2015 |
Max 1hr Temp Rise |
1.4 °C |
07:33 |
1.6 °C |
4.0 °C, 2012 |
0.6 °C, 2015 |
Max 1hr Hum Rise |
7% |
01:06 |
8% |
13%, 2021 |
4%, 2011 |
Max 10m Temp Fall |
0.2 °C |
03:42 |
0.5 °C |
1.2 °C, 2020 |
0.2 °C, 2015 |
Max 1hr Temp Fall |
0.7 °C |
20:22 |
1.5 °C |
2.8 °C, 2020 |
0.6 °C, 2015 |
Max 1hr Hum Fall |
2% |
10:19 |
10% |
20%, 2012 |
2%, 2016 |
Max 10m Wind Speed |
6.4 mph |
20:43 |
8.2 mph |
19.3 mph, 2019 |
6.0 mph, 2017 |
Minimum Feels-like |
-0.5 °C |
00:41 |
-1.4 °C |
6.5 °C, 2017 |
-4.0 °C, 2025 |
Maximum Feels-like |
8.5 °C |
13:07 |
8.3 °C |
17.6 °C, 2024 |
5.5 °C, 2015 |
Mean Feels-like |
4.4 °C |
|
3.3 °C |
13.5 °C, 2024 |
1.1 °C, 2025 |
Air-frost Hrs |
0 hrs |
|
0.4 hrs |
2 hrs, 2023 |
0 hrs, 2009 |
Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
Temperature Range |
6.2 °C (-0.3) |
6.7 °C (+0.3) |
14.2 °C (+7.7), 2012 |
2.2 °C (-4.3), 2015 |
Humidity Range |
18% |
31% |
47%, 2010 |
15%, 2020 |
Pressure Range |
3 hPa |
9 hPa |
16 hPa, 2017 |
3 hPa, 2014 |
Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
Sun Hours |
0.2 [2%] | 56 hrs (107%) [36%] |
10.4 [97%], 2009 |
0 [0%], 2013 |
Wet Hours |
0 | 27 hrs (105%) [7.5%] |
8, 2013 |
, 2009 |
Cloud Cover |
am: Mostly Cloudy transitioned to Overcast pm: Overcast |
Events |
None |
Comments |
- |
Extra Comments |
|
Issues |
Wind data from Tottenham (TODO: calibration) |
Observer Absent? |
Yes - observations may be unreliable |
Pond Temperature @ Hampstead Heath |
0.0 °C |