| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
-1.3 °C (-4.7) |
00:27 |
2.8 °C (-0.9) |
13.2 °C (+9.8), 2015 |
-5.3 °C (-8.7), 2010 |
| Maximum Temperature |
6.3 °C (-1.4) |
21:34 |
8.0 °C (-0.4) |
16.0 °C (+8.3), 2015 |
0.1 °C (-7.6), 2010 |
| Mean Temperature |
3.1 °C (-3.1) |
|
5.6 °C (-0.6) |
14.8 °C, 2015 |
-2.6 °C, 2010 |
| Minimum Humidity |
84% |
00:00 |
68% |
93%, 2021 |
57%, 2014 |
| Maximum Humidity |
97% |
23:59 |
90% |
98%, 2012 |
82%, 2016 |
| Mean Humidity |
94% |
|
80% |
96%, 2021 |
76%, 2014 |
| Minimum Pressure |
1009 hPa |
19:50 |
1000 hPa |
1034 hPa, 2017 |
988 hPa, 2019 |
| Maximum Pressure |
1019 hPa |
01:50 |
1010 hPa |
1039 hPa, 2021 |
1000 hPa, 2010 |
| Mean Pressure |
1014 hPa |
|
1005 hPa |
1035 hPa, 2021 |
996 hPa, 2010 |
| Mean Wind Speed |
4.1 mph (-1.0) |
|
6.1 mph (+1.0) |
11.9 mph, 2022 |
0.5 mph, 2016 |
| Maximum Wind Speed |
10.8 mph |
|
16.1 mph |
21.7 mph, 2022 |
4.7 mph, 2016 |
| Maximum Gust |
15.8 mph |
|
23.8 mph |
34.6 mph, 2022 |
6.3 mph, 2016 |
| Mean Wind Direction |
SW |
|
|
|
|
| Rainfall |
3.6 mm |
|
40.8 mm (117%) |
11.0 mm, 2023 |
|
| Maximum Hourly Rain |
1.4 mm |
16:14 |
|
3.7 mm, 2013 |
|
| Maximum 10-min Rain |
0.6 mm |
15:44 |
|
2.0 mm, 2014 |
|
| Maximum Rain Rate |
2.7 mm/h |
15:36 |
|
30 mm/h, 2014 |
|
| Minimum Dew Point |
-3.6 °C |
00:14 |
-0.4 °C |
9.4 °C, 2015 |
-8.0 °C, 2010 |
| Maximum Dew Point |
5.9 °C |
21:34 |
5.4 °C |
13.5 °C, 2015 |
-1.6 °C, 2010 |
| Mean Dew Point |
2.3 °C |
|
2.3 °C |
11.2 °C, 2015 |
-4.4 °C, 2010 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
-1.3 °C |
00:27 |
3.4 °C |
12.6 °C, 2015 |
-4.3 °C, 2010 |
| Day Maximum (09-21) |
* 5.9 °C * |
18:00 |
7.6 °C |
16.0 °C, 2015 |
0.1 °C, 2010 |
| Max 10m Temp Rise |
0.2 °C |
08:45 |
0.3 °C |
0.3 °C, 2010 |
0.1 °C, 2023 |
| Max 1hr Temp Rise |
0.9 °C |
11:48 |
1.2 °C |
1.4 °C, 2017 |
0.1 °C, 2023 |
| Max 1hr Hum Rise |
4% |
01:06 |
6% |
9%, 2013 |
1%, 2021 |
| Max 10m Temp Fall |
0.3 °C |
00:16 |
0.3 °C |
1.7 °C, 2024 |
0.2 °C, 2015 |
| Max 1hr Temp Fall |
1.4 °C |
20:52 |
1.0 °C |
5.3 °C, 2024 |
0.4 °C, 2016 |
| Max 1hr Hum Fall |
5% |
11:32 |
5% |
17%, 2014 |
2%, 2016 |
| Max 10m Wind Speed |
n/a |
|
9.1 mph |
16.6, 2022 |
2.5, 2016 |
| Minimum Feels-like |
-6.0 °C |
00:16 |
-0.9 °C |
14.9 °C, 2015 |
-9.8 °C, 2010 |
| Maximum Feels-like |
3.4 °C |
19:08 |
6.8 °C |
18.6 °C, 2015 |
0.0 °C, 2010 |
| Mean Feels-like |
-0.5 °C |
|
3.1 °C |
16.7 °C, 2015 |
-5.9 °C, 2010 |
| Air-frost Hrs |
4 hrs |
|
0.3 hrs |
23 hrs, 2010 |
0 hrs, 2012 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
7.6 °C (+3.4) |
5.2 °C (+0.6) |
8.9 °C (+4.7), 2024 |
1.9 °C (-2.3), 2016 |
| Humidity Range |
13% |
22% |
34%, 2014 |
3%, 2016 |
| Pressure Range |
10 hPa |
10 hPa |
26 hPa, 2024 |
2 hPa, 2017 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
0.1 [1%] | 54 hrs (135%) [40%] |
6.5 [93%], 2009 |
0 [0%], 2010 |
| Wet Hours |
5.5
[Mean rain rate: 0.7 mm/h] | 39 hrs (102%) [8.5%] |
11, 2023 |
0, 2009 |
| Cloud Cover |
Overcast |
| Events |
Air Frost |
| Comments |
Air Frost; 12-1730 Light Rain (16 Moderate) |
| Extra Comments |
|
| Issues |
Wind sensor failure: no data - reconstructed using nearby sites |
| Observer Absent? |
No |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
