| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
10.1 °C (+3.7) |
06:20 |
8.5 °C (+2.6) |
11.7 °C (+5.3), 2019 |
1.7 °C (-4.7), 2021 |
| Maximum Temperature |
26.5 °C (+11.4) |
14:40 |
18.9 °C (+4.8) |
26.5 °C (+11.4), 2011 |
9.8 °C (-5.2), 2016 |
| Mean Temperature |
18.6 °C (+7.6) |
|
13.7 °C (+3.7) |
18.6 °C, 2011 |
6.7 °C, 2016 |
| Minimum Humidity |
30% |
15:40 |
42% |
71%, 2025 |
23%, 2021 |
| Maximum Humidity |
79% |
07:15 |
79% |
95%, 2012 |
68%, 2017 |
| Mean Humidity |
52% |
|
60% |
84%, 2023 |
52%, 2011 |
| Minimum Pressure |
1010 hPa |
02:44 |
1018 hPa |
1029 hPa, 2021 |
990 hPa, 2012 |
| Maximum Pressure |
1015 hPa |
16:30 |
1022 hPa |
1031 hPa, 2021 |
1002 hPa, 2012 |
| Mean Pressure |
1012 hPa |
|
1020 hPa |
1030 hPa, 2021 |
996 hPa, 2012 |
| Mean Wind Speed |
1.7 mph (-3.2) |
|
4.3 mph (-0.6) |
7.8 mph, 2018 |
1.7 mph, 2011 |
| Maximum Wind Speed |
10.2 mph |
|
12.2 mph |
21.5 mph, 2012 |
7.6 mph, 2010 |
| Maximum Gust |
15.4 mph |
17:31 |
17.2 mph |
28.5 mph, 2022 |
10.7 mph, 2015 |
| Mean Wind Direction |
S |
|
|
|
|
| Rainfall |
trace |
|
1.8 mm (6%) |
17.2, 2025 |
|
| Maximum Hourly Rain |
n/a |
|
|
6.4, 2025 |
|
| Maximum 10-min Rain |
n/a |
|
|
2.4, 2023 |
|
| Maximum Rain Rate |
n/a |
|
|
30, 2023 |
|
| Minimum Dew Point |
5.4 °C |
18:30 |
2.6 °C |
6.7 °C, 2019 |
-6.3 °C, 2021 |
| Maximum Dew Point |
10.9 °C |
08:50 |
8.6 °C |
11.6 °C, 2019 |
3.5 °C, 2010 |
| Mean Dew Point |
7.8 °C |
|
5.6 °C |
8.2 °C, 2019 |
0.1 °C, 2010 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
10.1 °C |
06:25 |
8.5 °C |
11.7 °C, 2019 |
1.7 °C, 2021 |
| Day Maximum (09-21) |
26.5 °C |
14:40 |
18.9 °C |
26.5 °C, 2011 |
9.8 °C, 2016 |
| Max 10m Temp Rise |
1.4 °C |
07:28 |
0.6 °C |
1.4 °C, 2011 |
0.5 °C, 2013 |
| Max 1hr Temp Rise |
4.9 °C |
08:19 |
2.5 °C |
4.9 °C, 2011 |
1.2 °C, 2025 |
| Max 1hr Hum Rise |
9% |
20:12 |
8% |
14%, 2012 |
5%, 2009 |
| Max 10m Temp Fall |
0.5 °C |
16:57 |
0.4 °C |
1.2 °C, 2009 |
0.3 °C, 2025 |
| Max 1hr Temp Fall |
2.3 °C |
19:30 |
1.8 °C |
2.7 °C, 2009 |
1.1 °C, 2025 |
| Max 1hr Hum Fall |
12% |
08:27 |
11% |
20%, 2021 |
5%, 2017 |
| Max 10m Wind Speed |
7.7 mph |
17:49 |
8.5 mph |
12.3 mph, 2018 |
7.4 mph, 2020 |
| Minimum Feels-like |
10.1 °C |
05:56 |
7.4 °C |
11.8 °C, 2019 |
-0.9 °C, 2016 |
| Maximum Feels-like |
26.9 °C |
14:25 |
19.4 °C |
26.9 °C, 2011 |
9.5 °C, 2016 |
| Mean Feels-like |
19.0 °C |
|
13.7 °C |
19.0 °C, 2011 |
4.9 °C, 2016 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
16.4 °C (+7.7) |
10.5 °C (+2.2) |
16.4 °C (+7.7), 2011 |
3.4 °C (-5.3), 2025 |
| Humidity Range |
49% |
36% |
69%, 2021 |
21%, 2025 |
| Pressure Range |
5 hPa |
4 hPa |
12 hPa, 2012 |
2 hPa, 2010 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
9 [70%] | 154 hrs (126%) [54%] |
13 [100%], 2010 |
0 [0%], 2019 |
| Wet Hours |
0.4 | 3.9 hrs (11%) [0.7%] |
7, 2012 |
0, 2009 |
| Cloud Cover |
am: Sunny
pm: Mostly Sunny transitioned to Mostly Cloudy |
| Events |
Thunder |
| Comments |
; Thunder; 20, 2030 Light Showers |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
No |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
