| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
5.1 °C (+1.6) |
06:17 |
6.7 °C (+3.2) |
5.6 °C (+2.1), 2017 |
-2.6 °C (-6.1), 2010 |
| Maximum Temperature |
17.9 °C (+8.0) |
14:47 |
14.3 °C (+4.5) |
17.9 °C (+8.0), 2026 |
4.4 °C (-5.5), 2023 |
| Mean Temperature |
11.3 °C (+4.8) |
|
10.1 °C (+3.9) |
11.3 °C, 2026 |
2.9 °C, 2016 |
| Minimum Humidity |
53% |
15:37 |
68% |
90%, 2020 |
41%, 2012 |
| Maximum Humidity |
96% |
08:03 |
91% |
96%, 2014 |
78%, 2015 |
| Mean Humidity |
78% |
|
81% |
92%, 2020 |
62%, 2012 |
| Minimum Pressure |
1014 hPa |
16:12 |
1017 hPa |
1036 hPa, 2015 |
982 hPa, 2009 |
| Maximum Pressure |
1021 hPa |
00:01 |
1024 hPa |
1040 hPa, 2015 |
991 hPa, 2018 |
| Mean Pressure |
1017 hPa |
|
1020 hPa |
1038 hPa, 2015 |
989 hPa, 2018 |
| Mean Wind Speed |
3.0 mph (-2.2) |
|
5.0 mph (-0.2) |
10.0 mph, 2012 |
2.6 mph, 2013 |
| Maximum Wind Speed |
12.3 mph |
12:55 |
13.3 mph |
19.2 mph, 2012 |
8.0 mph, 2024 |
| Maximum Gust |
16.1 mph |
15:38 |
19.3 mph |
30.1 mph, 2012 |
12.3 mph, 2013 |
| Mean Wind Direction |
SSE |
|
|
|
|
| Rainfall |
0.0 mm |
|
0.0 mm (0%) |
12.4 mm, 2020 |
|
| Maximum Hourly Rain |
n/a |
|
|
8.5, 2017 |
|
| Maximum 10-min Rain |
n/a |
|
|
2.6, 2017 |
|
| Maximum Rain Rate |
n/a |
|
|
36, 2017 |
|
| Minimum Dew Point |
4.4 °C |
06:11 |
4.6 °C |
4.4 °C, 2026 |
-5.6 °C, 2010 |
| Maximum Dew Point |
9.2 °C |
14:30 |
8.8 °C |
9.2 °C, 2026 |
0.8 °C, 2021 |
| Mean Dew Point |
7.2 °C |
|
6.8 °C |
7.2 °C, 2026 |
-2.1 °C, 2010 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
5.1 °C |
06:17 |
6.5 °C |
6.1 °C, 2017 |
-2.6 °C, 2010 |
| Day Maximum (09-21) |
17.9 °C |
14:56 |
14.3 °C |
17.9 °C, 2026 |
4.4 °C, 2023 |
| Max 10m Temp Rise |
0.7 °C |
09:47 |
0.5 °C |
1.1 °C, 2014 |
0.1 °C, 2020 |
| Max 1hr Temp Rise |
3.4 °C |
10:37 |
2.0 °C |
4.3 °C, 2014 |
0.2 °C, 2020 |
| Max 1hr Hum Rise |
6% |
16:49 |
5% |
11%, 2019 |
2%, 2020 |
| Max 10m Temp Fall |
0.4 °C |
21:56 |
0.4 °C |
0.8 °C, 2017 |
0.2 °C, 2010 |
| Max 1hr Temp Fall |
1.6 °C |
22:35 |
1.4 °C |
2.3 °C, 2025 |
0.3 °C, 2020 |
| Max 1hr Hum Fall |
15% |
09:55 |
10% |
15%, 2017 |
2%, 2020 |
| Max 10m Wind Speed |
8.7 mph |
12:57 |
9.4 mph |
15.0 mph, 2017 |
5.1 mph, 2024 |
| Minimum Feels-like |
2.7 °C |
06:49 |
3.6 °C |
3.6 °C, 2024 |
-5.6 °C, 2010 |
| Maximum Feels-like |
18.7 °C |
14:47 |
14.9 °C |
18.7 °C, 2026 |
3.5 °C, 2016 |
| Mean Feels-like |
11.3 °C |
|
9.4 °C |
11.3 °C, 2026 |
-0.6 °C, 2016 |
| Air-frost Hrs |
0 hrs |
|
0 hrs |
9 hrs, 2010 |
0 hrs, 2011 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
12.8 °C (+6.4) |
7.6 °C (+1.4) |
13.4 °C (+7.0), 2013 |
1.1 °C (-5.3), 2020 |
| Humidity Range |
43% |
24% |
46%, 2014 |
4%, 2020 |
| Pressure Range |
7 hPa |
7 hPa |
19 hPa, 2009 |
3 hPa, 2011 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
10 [100%] | 29 hrs (172%) [59%] |
10 [100%], 2025 |
0 [0%], 2020 |
| Wet Hours |
0 | 0 hrs (0%) [0%] |
12, 2020 |
, 2009 |
| Cloud Cover |
unknown |
| Events |
Maximum possible sunshine |
| Comments |
data is awaiting quality control from site operator |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
8.1 °C |