Daily Report for 3rd April 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.9 °C (-4.5) 07:26 2.1 °C (-3.3) 10.7 °C (+5.3), 2014 -1.3 °C (-6.7), 2022
Maximum Temperature 8.4 °C (-4.7) 15:46 9.9 °C (-3.2) 18.9 °C (+5.8), 2014 4.2 °C (-8.9), 2013
Mean Temperature 4.5 °C (-4.6) 6.1 °C (-3.3) 13.8 °C, 2014 2.3 °C, 2013
Minimum Humidity 57% 15:40 59% 70%, 2018 45%, 2025
Maximum Humidity 94% 08:01 92% 96%, 2009 78%, 2011
Mean Humidity 81% 80% 87%, 2015 61%, 2013
Minimum Pressure 997 hPa 23:44 1004 hPa 1032 hPa, 2021 993 hPa, 2018
Maximum Pressure 1002 hPa 23:28 1014 hPa 1034 hPa, 2021 997 hPa, 2018
Mean Pressure 999 hPa 1008 hPa 1033 hPa, 2021 995 hPa, 2018
Mean Wind Speed 1.6 mph (-3.3) 3.3 mph (-1.6) 9.9 mph, 2013 1.6 mph, 2019
Maximum Wind Speed 14.2 mph 18:05 13.3 mph 21.2 mph, 2024 8.7 mph, 2015
Maximum Gust 18.4 mph 18:05 19.6 mph 32.3 mph, 2024 12.8 mph, 2015
Mean Wind Direction NNW
Rainfall 2.2 mm 4.8 mm (114%) 6.3 mm, 2012
Maximum Hourly Rain 1.5 mm 20:18 2.5 mm, 2010
Maximum 10-min Rain 0.7 mm 18:49 1.2 mm, 2012
Maximum Rain Rate 7 mm/h 18:45 24 mm/h, 2016
Minimum Dew Point -0.8 °C 23:58 0.5 °C 8.0 °C, 2014 -7.0 °C, 2013
Maximum Dew Point 3.1 °C 10:53 4.6 °C 11.5 °C, 2014 -1.5 °C, 2013
Mean Dew Point 1.4 °C 2.6 °C 9.2 °C, 2014 -4.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.9 °C 07:29 2.3 °C 10.7 °C, 2014 -1.3 °C, 2022
Day Maximum (09-21) 8.4 °C 15:47 9.9 °C 18.9 °C, 2014 4.2 °C, 2013
Max 10m Temp Rise 0.6 °C 09:08 0.7 °C 0.8 °C, 2009 0.3 °C, 2018
Max 1hr Temp Rise 2.4 °C 09:14 2.3 °C 3.2 °C, 2009 0.9 °C, 2021
Max 1hr Hum Rise 17% 19:12 13% 18%, 2016 3%, 2021
Max 10m Temp Fall 0.7 °C 18:47 0.7 °C 1.3 °C, 2012 0.2 °C, 2013
Max 1hr Temp Fall 2.6 °C 19:18 2.1 °C 3.0 °C, 2020 0.7 °C, 2013
Max 1hr Hum Fall 11% 09:54 10% 18%, 2013 6%, 2015
Max 10m Wind Speed 7.6 mph 18:13 8.8 mph 16.5 mph, 2024 6.4 mph, 2022
Minimum Feels-like -0.6 °C 23:28 -1.1 °C 11.3 °C, 2014 -5.9 °C, 2013
Maximum Feels-like 8.3 °C 15:37 9.8 °C 20.5 °C, 2014 1.2 °C, 2013
Mean Feels-like 3.7 °C 4.8 °C 14.7 °C, 2014 -2.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.5 °C (-0.2) 7.7 °C (+0.1) 10.9 °C (+3.2), 2017 3.2 °C (-4.5), 2024
Humidity Range 37% 33% 41%, 2016 23%, 2018
Pressure Range 5 hPa 10 hPa 9 hPa, 2015 2 hPa, 2025
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [26%]15 hrs (100%) [43%] 9 [77%], 2025 0 [0%], 2015
Wet Hours 2
[Mean rain rate: 1.1 mm/h]		6 hrs (130%) [8.3%] 9, 2015 0, 2009
Cloud Cover Partly Cloudy
Events None
Comments 18-20 Rain
Extra Comments
Issues 30m server outage at 8pm. No loss
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath n/a
Notes
Detailed daily weather report for Hampstead nw3 in London on 3rd 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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Wind rose