Daily Report for 19th March 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.8 °C (+1.2) 06:38 3.4 °C (-0.6) 11.9 °C (+7.3), 2017 -1.6 °C (-6.2), 2011
Maximum Temperature 10.9 °C (-0.3) 14:41 9.2 °C (-1.2) 15.9 °C (+4.7), 2014 3.2 °C (-8.0), 2018
Mean Temperature 8.5 °C (+0.5) 6.4 °C (-0.9) 13.0 °C, 2017 0.8 °C, 2018
Minimum Humidity 66% 14:36 72% 84%, 2020 38%, 2012
Maximum Humidity 92% 01:13 93% 97%, 2010 80%, 2014
Mean Humidity 80% 84% 92%, 2020 64%, 2012
Minimum Pressure 1011 hPa 00:03 1005 hPa 1033 hPa, 2022 994 hPa, 2013
Maximum Pressure 1020 hPa 21:34 1015 hPa 1043 hPa, 2022 999 hPa, 2013
Mean Pressure 1017 hPa 1010 hPa 1038 hPa, 2022 997 hPa, 2013
Mean Wind Speed 4.5 mph (-0.7) 5.4 mph (+0.2) 9.6 mph, 2018 1.6 mph, 2011
Maximum Wind Speed 11.9 mph 01:26 14.2 mph 21.7 mph, 2018 6.2 mph, 2011
Maximum Gust 18.4 mph 01:28 21.1 mph 31.4 mph, 2017 8.5 mph, 2011
Mean Wind Direction NW
Rainfall 0.5 mm 39.6 mm (166%) 4.9 mm, 2010
Maximum Hourly Rain 0.5 mm 02:41 1.9 mm, 2010
Maximum 10-min Rain 0.3 mm 02:41 1.1 mm, 2010
Maximum Rain Rate 0.5 mm/h 02:41 16 mm/h, 2010
Minimum Dew Point 3.9 °C 05:46 1.4 °C 8.1 °C, 2024 -6.3 °C, 2018
Maximum Dew Point 7.9 °C 01:13 6.5 °C 10.9 °C, 2010 -2.4 °C, 2018
Mean Dew Point 5.2 °C 3.8 °C 9.5 °C, 2024 -4.6 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.8 °C 06:27 3.6 °C 12.0 °C, 2017 -1.6 °C, 2011
Day Maximum (09-21) 10.9 °C 14:53 8.8 °C 15.9 °C, 2014 3.2 °C, 2018
Max 10m Temp Rise 0.3 °C 13:48 0.5 °C 1.8 °C, 2009 0.2 °C, 2015
Max 1hr Temp Rise 1.2 °C 10:06 1.5 °C 4.9 °C, 2011 0.5 °C, 2020
Max 1hr Hum Rise 5% 15:36 7% 13%, 2021 2%, 2015
Max 10m Temp Fall 0.6 °C 01:28 0.5 °C 1.3 °C, 2009 0.2 °C, 2010
Max 1hr Temp Fall 1.8 °C 02:11 1.3 °C 3.2 °C, 2009 0.5 °C, 2015
Max 1hr Hum Fall 7% 14:33 8% 14%, 2012 3%, 2024
Max 10m Wind Speed 10.3 mph 01:29 10.7 mph 16.1 mph, 2018 4.5 mph, 2011
Minimum Feels-like 2.3 °C 06:12 -0.0 °C 12.3 °C, 2017 -8.0 °C, 2018
Maximum Feels-like 10.9 °C 14:34 9.3 °C 15.9 °C, 2014 -0.9 °C, 2018
Mean Feels-like 7.0 °C 4.7 °C 13.5 °C, 2017 -4.6 °C, 2018
Air-frost Hrs 0 hrs 0.9 hrs 6 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.1 °C (-1.5) 5.8 °C (-0.6) 12.7 °C (+6.1), 2011 2.2 °C (-4.4), 2015
Humidity Range 26% 20% 55%, 2011 8%, 2024
Pressure Range 9 hPa 10 hPa 12 hPa, 2018 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [9%]23 hrs (34%) [12%] 11 [102%], 2022 0 [0%], 2015
Wet Hours 2
[Mean rain rate: 0.2 mm/h]
56 hrs (172%) [12%] 5, 2010 , 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 7.8 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th March 2023.
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

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Webcam Summary of Cloud Conditions

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