| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
2.6 °C (-3.4) |
06:14 |
3.5 °C (-2.2) |
10.8 °C (+4.8), 2013 |
0.9 °C (-5.1), 2021 |
| Maximum Temperature |
9.5 °C (-4.8) |
15:00 |
12.2 °C (-1.7) |
24.2 °C (+9.9), 2015 |
9.5 °C (-4.8), 2012 |
| Mean Temperature |
5.8 °C (-4.1) |
|
8.0 °C (-1.9) |
17.3 °C, 2015 |
5.7 °C, 2021 |
| Minimum Humidity |
39% |
14:04 |
48% |
68%, 2025 |
27%, 2015 |
| Maximum Humidity |
83% |
05:05 |
88% |
96%, 2009 |
70%, 2015 |
| Mean Humidity |
64% |
|
69% |
86%, 2016 |
48%, 2015 |
| Minimum Pressure |
1013 hPa |
00:14 |
1004 hPa |
1033 hPa, 2021 |
996 hPa, 2016 |
| Maximum Pressure |
1026 hPa |
22:51 |
1012 hPa |
1035 hPa, 2021 |
1002 hPa, 2025 |
| Mean Pressure |
1020 hPa |
|
1008 hPa |
1034 hPa, 2021 |
998 hPa, 2025 |
| Mean Wind Speed |
7.1 mph (+2.2) |
|
4.4 mph (-0.5) |
10.7 mph, 2024 |
1.0 mph, 2016 |
| Maximum Wind Speed |
19.4 mph |
|
12.5 mph |
29.8 mph, 2024 |
8.1 mph, 2011 |
| Maximum Gust |
27.0 mph |
12:50 |
17.4 mph |
46.1 mph, 2024 |
10.7 mph, 2011 |
| Mean Wind Direction |
NNE |
|
|
|
|
| Rainfall |
trace |
|
21.8 mm (104%) |
21.1, 2016 |
|
| Maximum Hourly Rain |
n/a |
|
|
6.9, 2016 |
|
| Maximum 10-min Rain |
n/a |
|
|
2.1, 2016 |
|
| Maximum Rain Rate |
n/a |
|
|
54, 2024 |
|
| Minimum Dew Point |
-4.6 °C |
12:58 |
-1.1 °C |
7.4 °C, 2009 |
-4.6 °C, 2012 |
| Maximum Dew Point |
2.4 °C |
16:48 |
5.8 °C |
14.5 °C, 2009 |
2.4 °C, 2012 |
| Mean Dew Point |
-0.9 °C |
|
2.4 °C |
10.0 °C, 2009 |
-0.9 °C, 2012 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
2.6 °C |
06:13 |
3.8 °C |
11.0 °C, 2013 |
0.9 °C, 2021 |
| Day Maximum (09-21) |
9.5 °C |
14:59 |
12.2 °C |
24.2 °C, 2015 |
9.5 °C, 2012 |
| Max 10m Temp Rise |
0.9 °C |
17:05 |
0.7 °C |
1.1 °C, 2020 |
0.4 °C, 2011 |
| Max 1hr Temp Rise |
2.4 °C |
17:35 |
2.7 °C |
4.6 °C, 2020 |
1.5 °C, 2017 |
| Max 1hr Hum Rise |
26% |
16:16 |
11% |
26%, 2012 |
3%, 2017 |
| Max 10m Temp Fall |
1.7 °C |
16:17 |
0.8 °C |
3.9 °C, 2024 |
0.3 °C, 2013 |
| Max 1hr Temp Fall |
3.2 °C |
16:19 |
2.1 °C |
4.2 °C, 2024 |
1.1 °C, 2013 |
| Max 1hr Hum Fall |
21% |
17:40 |
13% |
21%, 2012 |
6%, 2016 |
| Max 10m Wind Speed |
10.5 mph |
15:31 |
8.7 mph |
19.9 mph, 2024 |
5.4 mph, 2011 |
| Minimum Feels-like |
-1.7 °C |
06:15 |
1.4 °C |
10.8 °C, 2013 |
-1.7 °C, 2012 |
| Maximum Feels-like |
7.8 °C |
15:00 |
12.1 °C |
24.2 °C, 2015 |
7.8 °C, 2012 |
| Mean Feels-like |
3.1 °C |
|
7.2 °C |
17.3 °C, 2015 |
3.1 °C, 2012 |
| Air-frost Hrs |
0 hrs |
|
0.3 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
6.9 °C (-1.5) |
8.6 °C (+0.5) |
16.0 °C (+7.6), 2020 |
3.9 °C (-4.5), 2016 |
| Humidity Range |
44% |
41% |
52%, 2020 |
24%, 2016 |
| Pressure Range |
13 hPa |
8 hPa |
18 hPa, 2023 |
3 hPa, 2021 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
8 [64%] | 68 hrs (87%) [37%] |
12.6 [101%], 2020 |
0.1 [1%], 2011 |
| Wet Hours |
0.2 | 33 hrs (144%) [9.2%] |
16, 2016 |
0, 2010 |
| Cloud Cover |
am: Sunny transitioned to Mostly Sunny
pm: Partly Cloudy transitioned to Mostly Sunny |
| Events |
Hail: small stones |
| Comments |
15, 16 Moderate Showers with Hail/Ice |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
No |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
