Daily Report for 11th March 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.1 °C (-6.1) 23:16 2.4 °C (-1.3) 11.0 °C (+7.0), 2017 -2.4 °C (-6.4), 2023
Maximum Temperature 0.6 °C (-9.8) 00:04 7.9 °C (-2.1) 16.9 °C (+6.5), 2017 0.6 °C (-9.8), 2013
Mean Temperature -0.8 °C (-8.0) 5.1 °C (-1.7) 13.4 °C, 2017 -0.8 °C, 2013
Minimum Humidity 53% 16:16 65% 89%, 2024 46%, 2015
Maximum Humidity 79% 01:27 90% 97%, 2009 79%, 2013
Mean Humidity 68% 80% 93%, 2024 66%, 2019
Minimum Pressure 1007 hPa 05:03 1008 hPa 1034 hPa, 2012 988 hPa, 2018
Maximum Pressure 1008 hPa 17:22 1012 hPa 1038 hPa, 2012 997 hPa, 2018
Mean Pressure 1007 hPa 1010 hPa 1036 hPa, 2012 992 hPa, 2018
Mean Wind Speed 13.9 mph (+8.7) 4.9 mph (-0.3) 15.1 mph, 2021 1.4 mph, 2016
Maximum Wind Speed 27.3 mph 12:06 12.4 mph 29.5 mph, 2020 6.7 mph, 2016
Maximum Gust 38.9 mph 15:21 17.8 mph 45.6 mph, 2021 8.7 mph, 2012
Mean Wind Direction ENE
Rainfall / Snow-melt approx. 0.3 mm 19.8 mm (143%) 3.6 mm, 2022
Maximum Hourly Rain n/a 2.4, 2018
Maximum 10-min Rain n/a 2, 2018
Maximum Rain Rate n/a 40, 2018
Minimum Dew Point -9.0 °C 16:53 -0.9 °C 6.5 °C, 2017 -9.0 °C, 2013
Maximum Dew Point -2.6 °C 00:04 4.0 °C 11.0 °C, 2017 -2.6 °C, 2013
Mean Dew Point -6.0 °C 1.7 °C 9.0 °C, 2017 -6.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * -1.0 °C * 06:49 3.2 °C 11.0 °C, 2017 -2.4 °C, 2023
Day Maximum (09-21) * 0.2 °C * 13:23 7.8 °C 16.9 °C, 2017 0.2 °C, 2013
Max 10m Temp Rise 0.3 °C 11:13 0.3 °C 1.1 °C, 2011 0.2 °C, 2014
Max 1hr Temp Rise 1.2 °C 12:01 1.2 °C 2.8 °C, 2012 0.3 °C, 2024
Max 1hr Hum Rise 10% 11:01 5% 17%, 2023 2%, 2024
Max 10m Temp Fall 0.5 °C 10:41 0.3 °C 1.0 °C, 2020 0.1 °C, 2024
Max 1hr Temp Fall 1.2 °C 10:52 1.1 °C 2.3 °C, 2012 0.3 °C, 2024
Max 1hr Hum Fall 12% 13:17 7% 15%, 2023 2%, 2024
Max 10m Wind Speed 20.7 mph 11:43 9.3 mph 21.6 mph, 2021 3.8 mph, 2016
Minimum Feels-like -11.0 °C 22:28 -1.3 °C 11.4 °C, 2017 -11.0 °C, 2013
Maximum Feels-like -3.9 °C 01:39 7.1 °C 18.7 °C, 2017 -3.9 °C, 2013
Mean Feels-like -7.6 °C 3.0 °C 14.2 °C, 2017 -7.6 °C, 2013
Air-frost Hrs 20 hrs 3 hrs 20 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.7 °C (-3.7) 5.6 °C (-0.8) 11.9 °C (+5.5), 2009 1.1 °C (-5.3), 2024
Humidity Range 26% 25% 40%, 2009 7%, 2024
Pressure Range 1 hPa 5 hPa 16 hPa, 2021 1 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]22 hrs (57%) [19%] 9 [87%], 2016 0 [0%], 2022
Wet Hours 144 hrs (234%) [17%] 5, 2022 , 2009
Cloud Cover Overcast
Events Snowfall: ~0.3 cm
Air Frost
Comments 10-16 occasional. Snow Showers
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 11th 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