Daily Report for 12th March 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.3 °C (+5.2) 06:33 6.9 °C (+3.1) 9.3 °C (+5.2), 2017 -2.2 °C (-6.3), 2013
Maximum Temperature 12.4 °C (+1.9) 10:38 12.2 °C (+2.1) 14.9 °C (+4.4), 2014 3.9 °C (-6.6), 2013
Mean Temperature 11.2 °C (+3.6) 9.4 °C (+2.6) 11.2 °C, 2017 0.7 °C, 2013
Minimum Humidity 68% 00:25 57% 90%, 2024 28%, 2015
Maximum Humidity 83% 16:56 82% 97%, 2024 76%, 2015
Mean Humidity 76% 72% 93%, 2024 50%, 2015
Minimum Pressure 1012 hPa 00:04 1003 hPa 1034 hPa, 2012 986 hPa, 2018
Maximum Pressure 1022 hPa 23:23 1013 hPa 1036 hPa, 2012 1000 hPa, 2018
Mean Pressure 1015 hPa 1007 hPa 1035 hPa, 2012 990 hPa, 2018
Mean Wind Speed 1.5 mph (-3.7) 5.0 mph (-0.2) 11.4 mph, 2020 1.5 mph, 2017
Maximum Wind Speed 9.3 mph 21:41 12.9 mph 25.6 mph, 2013 6.4 mph, 2014
Maximum Gust 13.6 mph 21:46 20.6 mph 39.3 mph, 2013 8.7 mph, 2014
Mean Wind Direction WNW
Rainfall 2.0 mm 17.8 mm (118%) 12.4 mm, 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 4.9 °C 04:57 1.2 °C 6.7 °C, 2009 -10.3 °C, 2013
Maximum Dew Point 9.4 °C 15:09 7.0 °C 12.1 °C, 2024 -0.9 °C, 2013
Mean Dew Point 7.2 °C 4.3 °C 9.0 °C, 2024 -6.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.3 °C 06:33 7.0 °C 9.3 °C, 2017 -2.2 °C, 2013
Day Maximum (09-21) 12.4 °C 10:38 12.2 °C 14.9 °C, 2014 3.9 °C, 2013
Max 10m Temp Rise 0.4 °C 09:49 0.4 °C 0.8 °C, 2020 0.3 °C, 2019
Max 1hr Temp Rise 1.5 °C 09:53 1.5 °C 2.8 °C, 2020 0.8 °C, 2019
Max 1hr Hum Rise 5% 12:16 7% 17%, 2020 2%, 2024
Max 10m Temp Fall 0.2 °C 00:38 0.3 °C 2.0 °C, 2025 0.2 °C, 2017
Max 1hr Temp Fall 0.8 °C 22:57 1.1 °C 4.1 °C, 2019 0.5 °C, 2024
Max 1hr Hum Fall 6% 10:07 9% 19%, 2020 2%, 2024
Max 10m Wind Speed 7.3 mph 21:48 10.4 mph 20.6 mph, 2013 3.8 mph, 2016
Minimum Feels-like 9.0 °C 06:16 3.8 °C 9.0 °C, 2017 -10.8 °C, 2013
Maximum Feels-like 13.2 °C 14:47 12.5 °C 15.0 °C, 2024 1.7 °C, 2013
Mean Feels-like 11.5 °C 8.3 °C 11.5 °C, 2017 -4.7 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 9 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.1 °C (-3.4) 5.3 °C (-1.0) 11.9 °C (+5.5), 2014 3.1 °C (-3.4), 2017
Humidity Range 15% 26% 48%, 2015 7%, 2024
Pressure Range 10 hPa 9 hPa 22 hPa, 2019 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]29 hrs (70%) [24%] 10 [96%], 2012 0 [0%], 2009
Wet Hours 2
[Mean rain rate: 1.0 mm/h]		12 hrs (59%) [4.2%] 10, 2024 , 2009
Cloud Cover Overcast
Events None
Comments day Rain/Drizzle
Extra Comments
Issues Rain gauge failed to report all (>1mm) rain
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 12th March 2017.
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