| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
4.1 °C (+1.1) |
00:12 |
2.0 °C (-1.1) |
8.0 °C (+5.0), 2023 |
-3.7 °C (-6.7), 2025 |
| Maximum Temperature |
12.1 °C (+4.3) |
14:10 |
7.1 °C (-0.7) |
12.5 °C (+4.7), 2012 |
1.5 °C (-6.3), 2010 |
| Mean Temperature |
9.1 °C (+2.7) |
|
4.9 °C (-0.9) |
10.6 °C, 2023 |
0.0 °C, 2025 |
| Minimum Humidity |
79% |
01:50 |
76% |
89%, 2025 |
55%, 2013 |
| Maximum Humidity |
98% |
11:00 |
94% |
98%, 2010 |
87%, 2017 |
| Mean Humidity |
93% |
|
86% |
95%, 2025 |
75%, 2017 |
| Minimum Pressure |
1009 hPa |
17:04 |
1005 hPa |
1037 hPa, 2022 |
989 hPa, 2016 |
| Maximum Pressure |
1017 hPa |
01:19 |
1016 hPa |
1043 hPa, 2022 |
1006 hPa, 2023 |
| Mean Pressure |
1013 hPa |
|
1011 hPa |
1041 hPa, 2022 |
997 hPa, 2016 |
| Mean Wind Speed |
5.5 mph (+0.3) |
|
4.8 mph (-0.4) |
11.3 mph, 2023 |
0.3 mph, 2022 |
| Maximum Wind Speed |
13.2 mph |
|
13.3 mph |
25.8 mph, 2023 |
4.4 mph, 2025 |
| Maximum Gust |
16.8 mph |
05:22 |
19.1 mph |
36.9 mph, 2020 |
6.9 mph, 2025 |
| Mean Wind Direction |
SW |
|
|
|
|
| Rainfall |
6.3 mm |
|
37.1 mm (162%) |
15.9 mm, 2017 |
|
| Maximum Hourly Rain |
1.9 mm |
04:00 |
|
4.6 mm, 2017 |
|
| Maximum 10-min Rain |
0.3 mm |
03:51 |
|
1.0 mm, 2017 |
|
| Maximum Rain Rate |
1.8 mm/h |
03:51 |
|
18 mm/h, 2017 |
|
| Minimum Dew Point |
1.2 °C |
00:23 |
-0.6 °C |
4.4 °C, 2023 |
-4.5 °C, 2025 |
| Maximum Dew Point |
11.4 °C |
17:00 |
5.5 °C |
11.4 °C, 2011 |
0.7 °C, 2010 |
| Mean Dew Point |
8.1 °C |
|
2.7 °C |
8.5 °C, 2023 |
-0.8 °C, 2025 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
4.1 °C |
23:00 |
2.8 °C |
9.3 °C, 2020 |
-3.7 °C, 2025 |
| Day Maximum (09-21) |
12.1 °C |
14:10 |
6.8 °C |
12.5 °C, 2012 |
1.5 °C, 2010 |
| Max 10m Temp Rise |
0.3 °C |
11:44 |
0.3 °C |
0.6 °C, 2014 |
0.1 °C, 2010 |
| Max 1hr Temp Rise |
1.2 °C |
11:44 |
1.0 °C |
2.7 °C, 2014 |
0.3 °C, 2024 |
| Max 1hr Hum Rise |
6% |
03:15 |
4% |
11%, 2015 |
2%, 2010 |
| Max 10m Temp Fall |
0.1 °C |
16:09 |
0.3 °C |
0.8 °C, 2017 |
0.1 °C, 2010 |
| Max 1hr Temp Fall |
0.3 °C |
03:16 |
0.9 °C |
3.1 °C, 2017 |
0.3 °C, 2010 |
| Max 1hr Hum Fall |
2% |
01:28 |
6% |
16%, 2013 |
2%, 2011 |
| Max 10m Wind Speed |
7.7 mph |
07:47 |
8.9 mph |
16.7 mph, 2023 |
2.3 mph, 2025 |
| Minimum Feels-like |
0.6 °C |
03:23 |
-1.1 °C |
3.9 °C, 2019 |
-5.8 °C, 2025 |
| Maximum Feels-like |
14.0 °C |
13:53 |
7.2 °C |
14.0 °C, 2011 |
1.4 °C, 2010 |
| Mean Feels-like |
8.9 °C |
|
3.2 °C |
10.6 °C, 2023 |
-1.8 °C, 2010 |
| Air-frost Hrs |
0 hrs |
|
0.3 hrs |
11 hrs, 2025 |
0 hrs, 2010 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
8.0 °C (+3.2) |
5.1 °C (+0.4) |
10.2 °C (+5.4), 2014 |
1.1 °C (-3.7), 2010 |
| Humidity Range |
19% |
18% |
43%, 2013 |
8%, 2024 |
| Pressure Range |
8 hPa |
11 hPa |
22 hPa, 2017 |
4 hPa, 2018 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
0 [0%] | 14 hrs (55%) [16%] |
6.5 [89%], 2022 |
0 [0%], 2009 |
| Wet Hours |
10
[Mean rain rate: 0.6 mm/h] | 34 hrs (131%) [12%] |
10, 2011 |
, 2009 |
| Cloud Cover |
Overcast |
| Events |
None |
| Comments |
02-08 Light Rain; 14-1730 Slight Rain/Drizzle, & -00 occasional |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
No |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
