| Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
| Minimum Temperature |
7.9 °C (+3.8) |
02:28 |
2.3 °C (-1.5) |
9.3 °C (+5.2), 2017 |
-2.2 °C (-6.3), 2013 |
| Maximum Temperature |
13.9 °C (+3.4) |
15:01 |
8.6 °C (-1.5) |
14.9 °C (+4.4), 2014 |
3.9 °C (-6.6), 2013 |
| Mean Temperature |
10.3 °C (+3.6) |
|
5.3 °C (-1.5) |
11.2 °C, 2017 |
0.7 °C, 2013 |
| Minimum Humidity |
51% |
12:50 |
58% |
90%, 2024 |
28%, 2015 |
| Maximum Humidity |
84% |
23:59 |
85% |
97%, 2024 |
76%, 2015 |
| Mean Humidity |
66% |
|
72% |
93%, 2024 |
50%, 2015 |
| Minimum Pressure |
998 hPa |
19:32 |
1022 hPa |
1034 hPa, 2012 |
986 hPa, 2018 |
| Maximum Pressure |
1010 hPa |
00:40 |
1027 hPa |
1036 hPa, 2012 |
1000 hPa, 2018 |
| Mean Pressure |
1004 hPa |
|
1025 hPa |
1035 hPa, 2012 |
990 hPa, 2018 |
| Mean Wind Speed |
5.0 mph (-0.2) |
|
6.2 mph (+1.0) |
11.4 mph, 2020 |
1.5 mph, 2017 |
| Maximum Wind Speed |
11.8 mph |
|
14.4 mph |
25.6 mph, 2013 |
6.4 mph, 2014 |
| Maximum Gust |
19.2 mph |
15:38 |
21.0 mph |
39.3 mph, 2013 |
8.7 mph, 2014 |
| Mean Wind Direction |
S |
|
|
|
|
| Rainfall |
trace |
|
0.2 mm (1%) |
12.4, 2024 |
|
| Maximum Hourly Rain |
n/a |
|
|
4.2, 2019 |
|
| Maximum 10-min Rain |
n/a |
|
|
2.6, 2019 |
|
| Maximum Rain Rate |
n/a |
|
|
53, 2019 |
|
| Minimum Dew Point |
2.9 °C |
01:29 |
-1.4 °C |
6.7 °C, 2009 |
-10.3 °C, 2013 |
| Maximum Dew Point |
6.8 °C |
23:59 |
2.9 °C |
12.1 °C, 2024 |
-0.9 °C, 2013 |
| Mean Dew Point |
4.1 °C |
|
0.6 °C |
9.0 °C, 2024 |
-6.7 °C, 2013 |
| Measure | Value | Time |
Month cumul. | Record High | Record Low |
| Night Minimum (21-09) |
7.9 °C |
02:30 |
2.5 °C |
9.3 °C, 2017 |
-2.2 °C, 2013 |
| Day Maximum (09-21) |
13.9 °C |
15:00 |
8.6 °C |
14.9 °C, 2014 |
3.9 °C, 2013 |
| Max 10m Temp Rise |
0.5 °C |
09:12 |
0.5 °C |
0.8 °C, 2020 |
0.3 °C, 2019 |
| Max 1hr Temp Rise |
2.3 °C |
09:47 |
1.6 °C |
2.8 °C, 2020 |
0.8 °C, 2019 |
| Max 1hr Hum Rise |
7% |
16:44 |
6% |
17%, 2020 |
2%, 2024 |
| Max 10m Temp Fall |
0.4 °C |
16:18 |
0.3 °C |
2.0 °C, 2025 |
0.2 °C, 2017 |
| Max 1hr Temp Fall |
1.4 °C |
16:21 |
1.2 °C |
4.1 °C, 2019 |
0.5 °C, 2024 |
| Max 1hr Hum Fall |
6% |
10:06 |
8% |
19%, 2020 |
2%, 2024 |
| Max 10m Wind Speed |
7.7 mph |
15:49 |
9.9 mph |
20.6 mph, 2013 |
3.8 mph, 2016 |
| Minimum Feels-like |
5.4 °C |
00:41 |
-1.5 °C |
9.0 °C, 2017 |
-10.8 °C, 2013 |
| Maximum Feels-like |
13.9 °C |
14:52 |
8.1 °C |
15.0 °C, 2024 |
1.7 °C, 2013 |
| Mean Feels-like |
9.7 °C |
|
3.2 °C |
11.5 °C, 2017 |
-4.7 °C, 2013 |
| Air-frost Hrs |
0 hrs |
|
0.6 hrs |
9 hrs, 2013 |
0 hrs, 2009 |
| Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
| Temperature Range |
6.0 °C (-0.5) |
6.4 °C (-0.0) |
11.9 °C (+5.5), 2014 |
3.1 °C (-3.4), 2017 |
| Humidity Range |
33% |
27% |
48%, 2015 |
7%, 2024 |
| Pressure Range |
12 hPa |
5 hPa |
22 hPa, 2019 |
2 hPa, 2012 |
| Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
| Sun Hours |
4 [38%] | 45 hrs (109%) [37%] |
10 [96%], 2012 |
0 [0%], 2009 |
| Wet Hours |
0.3 | 0.6 hrs (3%) [0.2%] |
10, 2024 |
, 2009 |
| Cloud Cover |
am: Mostly Cloudy transitioned to Sunny
pm: Mostly Cloudy or Hazy |
| Events |
None |
| Comments |
possible eve/night Slight broken Drizzle/Rain |
| Extra Comments |
|
| Issues |
None known |
| Observer Absent? |
Yes - observations may be unreliable |
| Pond Temperature @ Hampstead Heath |
0.0 °C |
