Daily Report for 16th March 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+3.5) 23:55 6.0 °C (+2.2) 8.3 °C (+4.0), 2012 -0.1 °C (-4.4), 2025
Maximum Temperature 11.9 °C (+1.0) 12:39 11.6 °C (+1.3) 18.3 °C (+7.4), 2014 7.8 °C (-3.1), 2013
Mean Temperature 10.6 °C (+2.2) 8.9 °C (+1.7) 13.1 °C, 2014 4.8 °C, 2025
Minimum Humidity 73% 12:22 62% 83%, 2022 36%, 2014
Maximum Humidity 93% 00:31 90% 98%, 2011 71%, 2010
Mean Humidity 82% 79% 92%, 2011 58%, 2010
Minimum Pressure 995 hPa 21:00 1000 hPa 1030 hPa, 2009 992 hPa, 2013
Maximum Pressure 1010 hPa 00:00 1012 hPa 1034 hPa, 2021 1001 hPa, 2013
Mean Pressure 1002 hPa 1006 hPa 1032 hPa, 2009 995 hPa, 2013
Mean Wind Speed 12.8 mph (+7.6) 9.0 mph (+3.8) 12.8 mph, 2019 3.3 mph, 2022
Maximum Wind Speed 27.1 mph 16:16 21.8 mph 27.1 mph, 2019 9.2 mph, 2010
Maximum Gust 44.9 mph 17:26 36.0 mph 44.9 mph, 2019 13.2 mph, 2010
Mean Wind Direction SW
Rainfall 3.5 mm 46.0 mm (229%) 7.7 mm, 2022
Maximum Hourly Rain 1.8 mm 21:21 2.7 mm, 2022
Maximum 10-min Rain 1.1 mm 21:24 1.5 mm, 2018
Maximum Rain Rate 13 mm/h 21:19 26 mm/h, 2018
Minimum Dew Point 5.6 °C 23:56 2.8 °C 6.1 °C, 2023 -3.0 °C, 2010
Maximum Dew Point 9.6 °C 01:13 7.9 °C 10.0 °C, 2022 2.1 °C, 2010
Mean Dew Point 7.7 °C 5.3 °C 8.4 °C, 2023 -0.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.3 °C * 00:04 6.6 °C 10.3 °C, 2019 -0.1 °C, 2025
Day Maximum (09-21) 11.9 °C 12:35 11.6 °C 18.3 °C, 2014 7.8 °C, 2013
Max 10m Temp Rise 0.3 °C 09:48 0.5 °C 1.3 °C, 2009 0.1 °C, 2012
Max 1hr Temp Rise 1.0 °C 12:17 1.6 °C 3.5 °C, 2009 0.4 °C, 2012
Max 1hr Hum Rise 6% 20:34 10% 16%, 2018 3%, 2011
Max 10m Temp Fall 0.7 °C 21:31 0.7 °C 1.3 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 1.4 °C 22:07 1.6 °C 3.3 °C, 2021 0.4 °C, 2012
Max 1hr Hum Fall 8% 12:17 10% 22%, 2014 3%, 2022
Max 10m Wind Speed 20.4 mph 15:04 16.3 mph 20.4 mph, 2019 6.2 mph, 2010
Minimum Feels-like 3.7 °C 21:53 1.6 °C 5.9 °C, 2014 -5.6 °C, 2025
Maximum Feels-like 12.1 °C 13:20 11.6 °C 18.3 °C, 2014 6.2 °C, 2013
Mean Feels-like 10.2 °C 7.0 °C 12.7 °C, 2014 1.9 °C, 2025
Air-frost Hrs 0 hrs 0 hrs 0.1 hrs, 2025 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.1 °C (-2.4) 5.6 °C (-0.8) 13.0 °C (+6.5), 2009 1.5 °C (-5.0), 2012
Humidity Range 20% 28% 47%, 2009 10%, 2022
Pressure Range 15 hPa 12 hPa 15 hPa, 2019 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]36 hrs (64%) [22%] 10.7 [100%], 2014 0 [0%], 2011
Wet Hours 4
[Mean rain rate: 0.9 mm/h]		61 hrs (223%) [16%] 9, 2022 , 2009
Cloud Cover Overcast
Events None
Comments top n tail Rain, 11 Shower
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath n/a
Notes
Detailed daily weather report for Hampstead nw3 in London on 16th March 2019.
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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