Measure | Value (anomaly) | Time |
Month cumul. | Record High | Record Low |
Minimum Temperature |
4.2 °C (-3.2) |
06:28 |
6.2 °C (-1.2) |
11.8 °C (+4.4), 2015 |
2.8 °C (-4.7), 2010 |
Maximum Temperature |
10.7 °C (-5.7) |
15:40 |
14.6 °C (-1.8) |
20.2 °C (+3.8), 2018 |
8.9 °C (-7.5), 2012 |
Mean Temperature |
7.0 °C (-4.5) |
|
10.1 °C (-1.5) |
15.3 °C, 2018 |
7.0 °C, 2019 |
Minimum Humidity |
52% |
13:10 |
55% |
80%, 2012 |
33%, 2016 |
Maximum Humidity |
85% |
00:14 |
91% |
96%, 2012 |
73%, 2013 |
Mean Humidity |
74% |
|
77% |
89%, 2012 |
50%, 2016 |
Minimum Pressure |
1015 hPa |
00:01 |
1015 hPa |
1025 hPa, 2010 |
992 hPa, 2015 |
Maximum Pressure |
1025 hPa |
23:47 |
1020 hPa |
1028 hPa, 2009 |
1005 hPa, 2015 |
Mean Pressure |
1020 hPa |
|
1017 hPa |
1026 hPa, 2010 |
1001 hPa, 2021 |
Mean Wind Speed |
5.4 mph (+0.7) |
|
3.2 mph (-1.5) |
10.9 mph, 2021 |
2.5 mph, 2018 |
Maximum Wind Speed |
18.2 mph |
13:16 |
12.8 mph |
25.2 mph, 2021 |
8.7 mph, 2012 |
Maximum Gust |
32.3 mph |
18:24 |
21.3 mph |
35.4 mph, 2021 |
10.9 mph, 2014 |
Mean Wind Direction |
N |
|
|
|
|
Rainfall |
1.5 mm |
|
9.2 mm (155%) |
4.5 mm, 2015 |
|
Maximum Hourly Rain |
1.1 mm |
18:36 |
|
2.6 mm, 2015 |
|
Maximum 10-min Rain |
0.9 mm |
18:26 |
|
1.2 mm, 2022 |
|
Maximum Rain Rate |
13 mm/h |
18:24 |
|
13 mm/h, 2019 |
|
Minimum Dew Point |
0.2 °C |
11:27 |
3.5 °C |
7.5 °C, 2022 |
-3.9 °C, 2016 |
Maximum Dew Point |
4.6 °C |
16:07 |
8.0 °C |
13.3 °C, 2023 |
3.4 °C, 2010 |
Mean Dew Point |
2.6 °C |
|
6.0 °C |
9.8 °C, 2022 |
1.0 °C, 2010 |
Measure | Value | Time |
Month cumul. | Record High | Record Low |
Night Minimum (21-09) |
4.2 °C |
06:28 |
6.6 °C |
11.8 °C, 2015 |
2.8 °C, 2010 |
Day Maximum (09-21) |
10.7 °C |
15:41 |
14.6 °C |
20.2 °C, 2018 |
8.9 °C, 2012 |
Max 10m Temp Rise |
0.9 °C |
10:56 |
0.7 °C |
1.0 °C, 2016 |
0.4 °C, 2010 |
Max 1hr Temp Rise |
2.7 °C |
14:32 |
2.1 °C |
4.9 °C, 2016 |
1.0 °C, 2017 |
Max 1hr Hum Rise |
24% |
13:31 |
19% |
24%, 2019 |
3%, 2012 |
Max 10m Temp Fall |
2.4 °C |
13:26 |
1.3 °C |
2.4 °C, 2019 |
0.2 °C, 2012 |
Max 1hr Temp Fall |
3.7 °C |
17:41 |
3.0 °C |
3.7 °C, 2019 |
0.5 °C, 2012 |
Max 1hr Hum Fall |
19% |
14:34 |
11% |
26%, 2013 |
8%, 2010 |
Max 10m Wind Speed |
12.0 mph |
17:20 |
8.9 mph |
17.9 mph, 2021 |
6.1 mph, 2012 |
Minimum Feels-like |
-0.3 °C |
06:24 |
3.1 °C |
12.0 °C, 2015 |
-0.3 °C, 2019 |
Maximum Feels-like |
10.7 °C |
15:40 |
14.9 °C |
21.9 °C, 2023 |
8.9 °C, 2012 |
Mean Feels-like |
4.6 °C |
|
9.5 °C |
15.8 °C, 2018 |
4.6 °C, 2019 |
Air-frost Hrs |
0 hrs |
|
0 hrs |
0 hrs, 2009 |
0 hrs, 2009 |
Measure | Value (anomaly) |
Month cumul. | Record High | Record Low |
Temperature Range |
6.5 °C (-2.5) |
8.4 °C (-0.6) |
14.4 °C (+5.4), 2016 |
2.2 °C (-6.8), 2012 |
Humidity Range |
33% |
36% |
51%, 2015 |
16%, 2012 |
Pressure Range |
10 hPa |
6 hPa |
13 hPa, 2015 |
1 hPa, 2011 |
Measure | Value [% of max] |
Month cumul. | Record High | Record Low |
Sun Hours |
8 [59%] | 15 hrs (64%) [28%] |
13.5 [100%], 2011 |
0 [0%], 2012 |
Wet Hours |
2 [Mean rain rate: 0.8 mm/h] | 7 hrs (136%) [7.3%] |
4, 2015 |
0, 2010 |
Cloud Cover |
Mostly Sunny with periods of Partly Cloudy |
Events |
None |
Comments |
Showers |
Extra Comments |
|
Issues |
None known |
Observer Absent? |
Yes - observations may be unreliable |
Pond Temperature @ Hampstead Heath |
12.0 °C |