Daily Report for 15th March 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.3 °C (+5.0) 01:01 5.9 °C (+2.1) 9.3 °C (+5.0), 2019 -0.7 °C (-5.0), 2023
Maximum Temperature 14.4 °C (+3.6) 14:32 11.6 °C (+1.3) 17.2 °C (+6.4), 2014 6.8 °C (-4.0), 2015
Mean Temperature 12.1 °C (+4.3) 8.8 °C (+1.7) 12.4 °C, 2024 5.1 °C, 2023
Minimum Humidity 73% 17:24 61% 77%, 2011 32%, 2014
Maximum Humidity 94% 02:19 90% 98%, 2011 79%, 2014
Mean Humidity 82% 79% 91%, 2011 58%, 2014
Minimum Pressure 1005 hPa 04:13 1000 hPa 1028 hPa, 2016 988 hPa, 2018
Maximum Pressure 1011 hPa 22:23 1012 hPa 1036 hPa, 2017 993 hPa, 2018
Mean Pressure 1007 hPa 1006 hPa 1033 hPa, 2017 991 hPa, 2018
Mean Wind Speed 11.3 mph (+6.1) 8.8 mph (+3.6) 11.3 mph, 2019 1.8 mph, 2017
Maximum Wind Speed 24.1 mph 09:03 21.5 mph 24.1 mph, 2019 7.7 mph, 2017
Maximum Gust 47.2 mph 09:45 35.4 mph 47.2 mph, 2019 10.5 mph, 2017
Mean Wind Direction WSW
Rainfall 2.6 mm 42.5 mm (225%) 4.8 mm, 2018
Maximum Hourly Rain 1.5 mm 01:01 1.5 mm, 2018
Maximum 10-min Rain 0.4 mm 00:11 0.6 mm, 2013
Maximum Rain Rate 2.6 mm/h 00:16 7 mm/h, 2024
Minimum Dew Point 7.3 °C 20:40 2.6 °C 7.3 °C, 2019 -5.4 °C, 2013
Maximum Dew Point 10.2 °C 10:28 7.8 °C 11.8 °C, 2024 3.9 °C, 2015
Mean Dew Point 9.0 °C 5.2 °C 9.9 °C, 2024 0.7 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.3 °C 01:01 6.3 °C 11.4 °C, 2024 -0.7 °C, 2023
Day Maximum (09-21) 14.4 °C 14:32 11.6 °C 17.2 °C, 2014 6.8 °C, 2015
Max 10m Temp Rise 0.3 °C 10:11 0.5 °C 0.9 °C, 2012 0.2 °C, 2015
Max 1hr Temp Rise 1.2 °C 10:28 1.7 °C 4.0 °C, 2012 0.6 °C, 2015
Max 1hr Hum Rise 9% 22:48 11% 13%, 2021 4%, 2011
Max 10m Temp Fall 0.3 °C 15:25 0.7 °C 1.2 °C, 2020 0.2 °C, 2015
Max 1hr Temp Fall 0.8 °C 15:25 1.7 °C 2.8 °C, 2020 0.6 °C, 2015
Max 1hr Hum Fall 5% 16:30 11% 20%, 2012 2%, 2016
Max 10m Wind Speed 19.3 mph 10:22 16.0 mph 19.3 mph, 2019 6.0 mph, 2017
Minimum Feels-like 6.1 °C 00:19 1.5 °C 6.5 °C, 2017 -2.2 °C, 2023
Maximum Feels-like 15.7 °C 14:24 11.6 °C 17.6 °C, 2024 5.5 °C, 2015
Mean Feels-like 12.7 °C 6.8 °C 13.5 °C, 2024 2.7 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 2 hrs, 2023 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.1 °C (-1.4) 5.7 °C (-0.7) 14.2 °C (+7.7), 2012 2.2 °C (-4.3), 2015
Humidity Range 21% 29% 47%, 2010 15%, 2020
Pressure Range 6 hPa 12 hPa 16 hPa, 2017 3 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.4 [4%]36 hrs (68%) [23%] 10.4 [98%], 2009 0 [0%], 2013
Wet Hours 4
[Mean rain rate: 0.7 mm/h]		57 hrs (222%) [16%] 8, 2013 , 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments top n tail Rain, 15 Shower
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) n/a
Notes
Detailed daily weather report for Hampstead nw3 in London on 15th 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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