Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
Minimum Temperature |
8.1 °C (+0.8) |
22:42 |
8.6 °C (-0.0) |
12.6 °C (+5.3), 2022 |
1.6 °C (-5.7), 2012 |
Maximum Temperature |
12.9 °C (-0.2) |
12:22 |
14.0 °C (-0.8) |
18.2 °C (+5.1), 2022 |
9.1 °C (-4.0), 2012 |
Mean Temperature |
9.6 °C (+0.3) |
|
11.2 °C (-0.4) |
15.8 °C, 2022 |
5.7 °C, 2018 |
Minimum Humidity |
72% |
14:35 |
74% |
89%, 2024 |
55%, 2018 |
Maximum Humidity |
89% |
00:17 |
93% |
98%, 2013 |
80%, 2016 |
Mean Humidity |
84% |
|
86% |
93%, 2024 |
76%, 2016 |
Minimum Pressure |
1001 hPa |
03:16 |
1005 hPa |
1032 hPa, 2016 |
979 hPa, 2013 |
Maximum Pressure |
1010 hPa |
23:46 |
1012 hPa |
1037 hPa, 2016 |
992 hPa, 2023 |
Mean Pressure |
1004 hPa |
|
1008 hPa |
1034 hPa, 2016 |
989 hPa, 2023 |
Mean Wind Speed |
4.8 mph (+0.7) |
|
3.7 mph (-0.4) |
9.6 mph, 2013 |
2.0 mph, 2019 |
Maximum Wind Speed |
16.4 mph |
14:17 |
13.3 mph |
31.1 mph, 2013 |
6.6 mph, 2019 |
Maximum Gust |
31.1 mph |
14:28 |
21.8 mph |
50.0 mph, 2013 |
9.8 mph, 2009 |
Mean Wind Direction |
SW |
|
|
|
|
Rainfall |
1.0 mm |
|
154.3 mm (263%) |
15.2 mm, 2013 |
|
Maximum Hourly Rain |
0.7 mm |
15:35 |
|
6.7 mm, 2015 |
|
Maximum 10-min Rain |
0.5 mm |
15:35 |
|
3.0 mm, 2015 |
|
Maximum Rain Rate |
7 mm/h |
15:27 |
|
66 mm/h, 2015 |
|
Minimum Dew Point |
5.7 °C |
22:22 |
6.7 °C |
10.4 °C, 2022 |
-0.3 °C, 2012 |
Maximum Dew Point |
8.8 °C |
12:42 |
11.0 °C |
15.4 °C, 2022 |
5.6 °C, 2018 |
Mean Dew Point |
7.0 °C |
|
8.9 °C |
13.1 °C, 2022 |
2.9 °C, 2018 |
Measure | Value | Time |
Month cumul. | Record High | Record Low |
Night Minimum (21-09) |
* 7.5 °C * |
23:52 |
8.9 °C |
14.1 °C, 2022 |
1.6 °C, 2012 |
Day Maximum (09-21) |
12.9 °C |
12:22 |
14.0 °C |
18.2 °C, 2022 |
9.1 °C, 2012 |
Max 10m Temp Rise |
0.4 °C |
08:17 |
0.4 °C |
1.0 °C, 2018 |
0.3 °C, 2010 |
Max 1hr Temp Rise |
1.4 °C |
09:01 |
1.5 °C |
2.6 °C, 2017 |
0.8 °C, 2015 |
Max 1hr Hum Rise |
12% |
16:21 |
6% |
16%, 2018 |
3%, 2012 |
Max 10m Temp Fall |
1.4 °C |
15:31 |
0.5 °C |
1.7 °C, 2009 |
0.2 °C, 2010 |
Max 1hr Temp Fall |
3.4 °C |
16:11 |
1.3 °C |
3.4 °C, 2020 |
0.3 °C, 2024 |
Max 1hr Hum Fall |
5% |
10:58 |
7% |
18%, 2013 |
2%, 2024 |
Max 10m Wind Speed |
7.1 mph |
14:33 |
8.7 mph |
25.1 mph, 2013 |
5.0 mph, 2019 |
Minimum Feels-like |
4.7 °C |
04:59 |
7.0 °C |
14.3 °C, 2022 |
-2.8 °C, 2012 |
Maximum Feels-like |
13.6 °C |
12:36 |
15.5 °C |
21.7 °C, 2022 |
8.5 °C, 2018 |
Mean Feels-like |
9.6 °C |
|
11.7 °C |
18.7 °C, 2022 |
2.8 °C, 2018 |
Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
Temperature Range |
4.8 °C (-0.9) |
5.4 °C (-0.8) |
9.9 °C (+4.2), 2017 |
3.0 °C (-2.7), 2021 |
Humidity Range |
17% |
19% |
38%, 2013 |
7%, 2024 |
Pressure Range |
8 hPa |
7 hPa |
23 hPa, 2013 |
2 hPa, 2019 |
Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
Sun Hours |
2.8 [32%] | 69 hrs (64%) [26%] |
7 [79%], 2014 |
0.1 [1%], 2024 |
Wet Hours |
1.5 [Mean rain rate: 0.7 mm/h] | 121 hrs (272%) [18%] |
7, 2013 |
0, 2009 |
Cloud Cover |
Partly Cloudy |
Events |
None |
Comments |
pm Showers |
Extra Comments |
|
Issues |
wind sensor not reporting properly - v low speeds |
Observer Absent? |
Yes - observations may be unreliable |
Pond Temperature @ Hampstead Heath |
10.0 °C |