| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
14.3 °C (+2.9) |
03:18 |
10.9 °C (-0.3) |
14.3 °C (+2.9), 2022 |
8.1 °C (-3.3), 2025 |
| Maximum Temperature |
22.4 °C (+2.2) |
15:52 |
19.9 °C (+0.0) |
25.3 °C (+5.1), 2021 |
15.5 °C (-4.7), 2020 |
| Mean Temperature |
17.8 °C (+2.6) |
|
15.2 °C (-0.1) |
20.0 °C, 2021 |
12.4 °C, 2009 |
| Minimum Humidity |
45% |
17:33 |
57% |
68%, 2010 |
34%, 2014 |
| Maximum Humidity |
94% |
06:11 |
91% |
95%, 2010 |
79%, 2011 |
| Mean Humidity |
72% |
|
76% |
86%, 2010 |
56%, 2014 |
| Minimum Pressure |
1004 hPa |
06:46 |
1015 hPa |
1031 hPa, 2015 |
993 hPa, 2012 |
| Maximum Pressure |
1012 hPa |
23:53 |
1019 hPa |
1033 hPa, 2015 |
1005 hPa, 2012 |
| Mean Pressure |
1007 hPa |
|
1017 hPa |
1032 hPa, 2015 |
999 hPa, 2012 |
| Mean Wind Speed |
4.9 mph (+0.5) |
|
3.2 mph (-1.2) |
12.6 mph, 2012 |
1.9 mph, 2021 |
| Maximum Wind Speed |
14.1 mph |
16:21 |
10.8 mph |
25.6 mph, 2012 |
8.3 mph, 2021 |
| Maximum Gust |
25.1 mph |
14:19 |
18.7 mph |
35.7 mph, 2019 |
12.5 mph, 2021 |
| Mean Wind Direction |
W |
|
|
|
|
| Rainfall |
2.2 mm |
|
14.7 mm (117%) |
8.5 mm, 2010 |
|
| Maximum Hourly Rain |
1.2 mm |
02:24 |
|
5.0 mm, 2016 |
|
| Maximum 10-min Rain |
0.7 mm |
03:53 |
|
3.5 mm, 2010 |
|
| Maximum Rain Rate |
4.8 mm/h |
03:50 |
|
78 mm/h, 2016 |
|
| Minimum Dew Point |
9.3 °C |
17:33 |
8.6 °C |
10.2 °C, 2010 |
2.1 °C, 2015 |
| Maximum Dew Point |
14.4 °C |
07:43 |
13.1 °C |
17.8 °C, 2016 |
8.0 °C, 2013 |
| Mean Dew Point |
12.3 °C |
|
10.8 °C |
13.8 °C, 2016 |
5.2 °C, 2015 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
14.3 °C |
03:09 |
10.9 °C |
14.4 °C, 2016 |
8.1 °C, 2025 |
| Day Maximum (09-21) |
22.4 °C |
16:14 |
19.9 °C |
25.3 °C, 2021 |
15.5 °C, 2020 |
| Max 10m Temp Rise |
0.6 °C |
14:48 |
0.6 °C |
0.8 °C, 2014 |
0.4 °C, 2012 |
| Max 1hr Temp Rise |
1.6 °C |
13:27 |
2.2 °C |
3.0 °C, 2014 |
1.1 °C, 2017 |
| Max 1hr Hum Rise |
12% |
20:36 |
10% |
22%, 2011 |
4%, 2020 |
| Max 10m Temp Fall |
0.7 °C |
18:05 |
0.6 °C |
2.1 °C, 2016 |
0.3 °C, 2009 |
| Max 1hr Temp Fall |
2.0 °C |
20:46 |
1.6 °C |
4.6 °C, 2016 |
0.9 °C, 2012 |
| Max 1hr Hum Fall |
11% |
08:23 |
11% |
16%, 2014 |
5%, 2017 |
| Max 10m Wind Speed |
11.6 mph |
16:27 |
8.4 mph |
18.4 mph, 2012 |
6.5 mph, 2018 |
| Minimum Feels-like |
17.0 °C |
23:58 |
11.4 °C |
17.0 °C, 2022 |
5.0 °C, 2013 |
| Maximum Feels-like |
24.8 °C |
15:43 |
22.4 °C |
28.6 °C, 2016 |
16.1 °C, 2020 |
| Mean Feels-like |
20.2 °C |
|
16.9 °C |
22.6 °C, 2021 |
12.4 °C, 2013 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
8.1 °C (-0.7) |
9.1 °C (+0.4) |
12.5 °C (+3.7), 2014 |
3.9 °C (-4.9), 2012 |
| Humidity Range |
49% |
34% |
54%, 2014 |
22%, 2017 |
| Pressure Range |
7 hPa |
4 hPa |
21 hPa, 2019 |
2 hPa, 2015 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
7 [47%] | 36 hrs (71%) [30%] |
15 [100%], 2021 |
0 [0%], 2017 |
| Wet Hours |
3 [Mean rain rate: 0.7 mm/h] | 15 hrs (154%) [7.9%] |
6, 2012 |
0, 2009 |
| Cloud Cover |
unknown |
| Events |
None |
| Comments |
o.night rn |
| Extra Comments |
|
| Issues |
webcam disk full - missing images |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
18.0 °C |