Daily Report for 22nd March 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.1 °C (-2.6) 03:20 1.8 °C (-2.3) 10.1 °C (+5.3), 2023 1.1 °C (-3.6), 2016
Maximum Temperature 5.1 °C (-6.5) 14:35 7.2 °C (-3.4) 19.6 °C (+8.1), 2022 5.1 °C (-6.5), 2013
Mean Temperature 3.3 °C (-4.6) 4.4 °C (-2.8) 13.2 °C, 2022 3.3 °C, 2013
Minimum Humidity 68% 15:41 64% 78%, 2019 38%, 2012
Maximum Humidity 90% 22:56 91% 94%, 2023 81%, 2017
Mean Humidity 78% 79% 84%, 2023 64%, 2015
Minimum Pressure 1007 hPa 18:57 1004 hPa 1036 hPa, 2011 997 hPa, 2014
Maximum Pressure 1013 hPa 01:08 1010 hPa 1040 hPa, 2011 1002 hPa, 2014
Mean Pressure 1009 hPa 1007 hPa 1038 hPa, 2011 999 hPa, 2014
Mean Wind Speed 9.8 mph (+4.6) 5.5 mph (+0.3) 11.3 mph, 2023 1.5 mph, 2016
Maximum Wind Speed 18.5 mph 11:22 13.6 mph 21.2 mph, 2023 6.3 mph, 2016
Maximum Gust 27.0 mph 17:06 19.6 mph 34.6 mph, 2023 10.5 mph, 2016
Mean Wind Direction E
Rainfall / Snow-melt approx. 3.4 mm 47.0 mm (170%) 7.0 mm, 2017
Maximum Hourly Rain 0.9 mm 20:34 3.1 mm, 2017
Maximum 10-min Rain 0.3 mm 19:35 1.8 mm, 2014
Maximum Rain Rate 0.5 mm/h 20:09 36 mm/h, 2014
Minimum Dew Point -1.5 °C 05:28 -1.8 °C 7.9 °C, 2023 -3.1 °C, 2014
Maximum Dew Point 1.3 °C 22:02 3.4 °C 11.1 °C, 2023 1.3 °C, 2013
Mean Dew Point -0.2 °C 0.9 °C 9.4 °C, 2025 -0.8 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.1 °C 03:20 2.3 °C 11.8 °C, 2025 1.1 °C, 2016
Day Maximum (09-21) 5.1 °C 14:35 7.1 °C 19.6 °C, 2022 5.1 °C, 2013
Max 10m Temp Rise 0.3 °C 12:18 0.4 °C 0.9 °C, 2009 0.2 °C, 2019
Max 1hr Temp Rise 0.7 °C 09:13 1.4 °C 3.5 °C, 2016 0.4 °C, 2019
Max 1hr Hum Rise 12% 17:46 7% 18%, 2022 3%, 2019
Max 10m Temp Fall 0.4 °C 17:13 0.4 °C 0.7 °C, 2009 0.2 °C, 2019
Max 1hr Temp Fall 1.1 °C 17:30 1.1 °C 2.3 °C, 2025 0.9 °C, 2019
Max 1hr Hum Fall 6% 04:28 8% 16%, 2012 2%, 2019
Max 10m Wind Speed 14.0 mph 11:31 10.3 mph 15.8 mph, 2023 3.6 mph, 2016
Minimum Feels-like -4.1 °C 07:18 -2.2 °C 10.8 °C, 2023 -4.1 °C, 2013
Maximum Feels-like 2.6 °C 23:30 6.2 °C 20.3 °C, 2022 2.6 °C, 2013
Mean Feels-like -1.2 °C 2.0 °C 14.1 °C, 2025 -1.2 °C, 2013
Air-frost Hrs 0 hrs 2 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.0 °C (-3.8) 5.5 °C (-1.0) 12.3 °C (+5.5), 2016 2.8 °C (-4.0), 2019
Humidity Range 22% 27% 50%, 2012 6%, 2019
Pressure Range 6 hPa 6 hPa 15 hPa, 2018 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]37 hrs (47%) [16%] 10 [91%], 2020 0 [0%], 2013
Wet Hours 8
[Mean rain rate: 0.4 mm/h]		80 hrs (212%) [15%] 8, 2013 , 2009
Cloud Cover Overcast
Events Snowfall: trace amount
Comments -04 Slight Rain; 06-08 Slight Snow Showers; 17-23 Light broken Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 22nd March 2013.
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose