Daily Report for 20th April 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.9 °C (+3.8) 06:28 4.4 °C (-1.4) 13.9 °C (+7.8), 2018 1.4 °C (-4.7), 2013
Maximum Temperature 23.7 °C (+9.1) 15:01 13.3 °C (-0.7) 25.9 °C (+11.3), 2018 10.6 °C (-4.0), 2024
Mean Temperature 16.6 °C (+6.4) 8.8 °C (-1.0) 20.0 °C, 2018 7.2 °C, 2024
Minimum Humidity 33% 15:28 54% 75%, 2014 33%, 2011
Maximum Humidity 79% 06:46 88% 95%, 2014 72%, 2017
Mean Humidity 57% 74% 90%, 2014 54%, 2011
Minimum Pressure 1028 hPa 18:38 1014 hPa 1032 hPa, 2017 990 hPa, 2012
Maximum Pressure 1032 hPa 08:49 1020 hPa 1037 hPa, 2017 995 hPa, 2012
Mean Pressure 1030 hPa 1017 hPa 1035 hPa, 2017 992 hPa, 2012
Mean Wind Speed 3.0 mph (-1.9) 4.4 mph (-0.5) 7.9 mph, 2020 1.0 mph, 2021
Maximum Wind Speed 9.4 mph 10:08 12.9 mph 18.4 mph, 2020 8.9 mph, 2021
Maximum Gust 13.8 mph 09:17 19.2 mph 28.8 mph, 2023 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 0.0 mm 10.8 mm (39%) 8.0 mm, 2012
Maximum Hourly Rain n/a 4.9, 2012
Maximum 10-min Rain n/a 2.6, 2012
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 5.8 °C 23:21 1.6 °C 9.6 °C, 2018 -3.0 °C, 2010
Maximum Dew Point 10.5 °C 11:51 6.4 °C 14.1 °C, 2018 4.2 °C, 2013
Mean Dew Point 7.4 °C 4.1 °C 11.5 °C, 2018 -0.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.9 °C 06:28 4.5 °C 13.9 °C, 2018 1.4 °C, 2013
Day Maximum (09-21) 23.7 °C 14:48 13.3 °C 25.9 °C, 2018 10.6 °C, 2024
Max 10m Temp Rise 0.6 °C 09:51 0.6 °C 1.0 °C, 2013 0.4 °C, 2014
Max 1hr Temp Rise 3.3 °C 10:29 2.4 °C 4.2 °C, 2013 1.6 °C, 2014
Max 1hr Hum Rise 8% 20:31 10% 29%, 2023 4%, 2010
Max 10m Temp Fall 0.7 °C 20:40 0.6 °C 1.7 °C, 2012 0.4 °C, 2014
Max 1hr Temp Fall 2.4 °C 20:58 1.8 °C 4.3 °C, 2023 1.3 °C, 2017
Max 1hr Hum Fall 10% 10:25 11% 19%, 2013 1%, 2017
Max 10m Wind Speed 7.5 mph 19:06 9.8 mph 14.5 mph, 2023 5.7 mph, 2021
Minimum Feels-like 9.5 °C 06:23 1.2 °C 15.1 °C, 2018 -0.6 °C, 2024
Maximum Feels-like 24.9 °C 14:07 13.4 °C 28.6 °C, 2018 10.6 °C, 2024
Mean Feels-like 16.9 °C 7.6 °C 22.0 °C, 2018 5.4 °C, 2024
Air-frost Hrs 0 hrs 0.1 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.8 °C (+5.3) 8.9 °C (+0.7) 15.3 °C (+6.8), 2011 6.7 °C (-1.8), 2014
Humidity Range 46% 34% 56%, 2013 20%, 2014
Pressure Range 4 hPa 5 hPa 11 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13 [102%]116 hrs (111%) [47%] 13 [102%], 2019 0 [0%], 2014
Wet Hours 020 hrs (64%) [4.1%] 5, 2014 0, 2009
Cloud Cover Sunny
Events Maximum possible sunshine
Comments -
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 20th April 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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