Daily Report for 19th April 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.6 °C (+0.5) 23:57 5.3 °C (-0.4) 11.2 °C (+5.1), 2018 2.1 °C (-4.0), 2021
Maximum Temperature 15.4 °C (+0.8) 14:48 13.5 °C (-0.4) 28.4 °C (+13.8), 2018 11.3 °C (-3.3), 2012
Mean Temperature 10.6 °C (+0.7) 9.3 °C (-0.4) 20.3 °C, 2018 7.7 °C, 2015
Minimum Humidity 52% 17:58 57% 71%, 2012 25%, 2018
Maximum Humidity 89% 06:18 91% 94%, 2012 69%, 2017
Mean Humidity 75% 78% 88%, 2012 51%, 2017
Minimum Pressure 1025 hPa 16:29 1014 hPa 1034 hPa, 2017 979 hPa, 2012
Maximum Pressure 1028 hPa 00:14 1023 hPa 1038 hPa, 2017 990 hPa, 2012
Mean Pressure 1026 hPa 1019 hPa 1036 hPa, 2017 984 hPa, 2012
Mean Wind Speed 8.6 mph (+3.7) 5.6 mph (+0.7) 8.6 mph, 2023 0.8 mph, 2021
Maximum Wind Speed 17.4 mph 14:51 14.3 mph 17.4 mph, 2023 6.7 mph, 2017
Maximum Gust 27.6 mph 14:12 22.3 mph 27.6 mph, 2023 9.4 mph, 2017
Mean Wind Direction E
Rainfall 0.0 mm 28.4 mm (107%) 8.4 mm, 2012
Maximum Hourly Rain n/a 2.7, 2012
Maximum 10-min Rain n/a 1.5, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point 2.8 °C 23:12 2.7 °C 6.4 °C, 2018 -3.2 °C, 2017
Maximum Dew Point 9.3 °C 12:31 7.7 °C 12.0 °C, 2018 1.4 °C, 2017
Mean Dew Point 6.2 °C 5.4 °C 9.4 °C, 2018 -1.3 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.4 °C * 06:17 5.8 °C 11.2 °C, 2018 2.1 °C, 2021
Day Maximum (09-21) 15.4 °C 14:48 13.5 °C 28.4 °C, 2018 11.3 °C, 2012
Max 10m Temp Rise 0.6 °C 14:42 0.6 °C 0.8 °C, 2020 0.5 °C, 2015
Max 1hr Temp Rise 1.9 °C 12:59 2.2 °C 3.4 °C, 2018 1.2 °C, 2013
Max 1hr Hum Rise 8% 19:49 11% 14%, 2019 4%, 2010
Max 10m Temp Fall 0.6 °C 15:00 0.6 °C 0.8 °C, 2018 0.3 °C, 2013
Max 1hr Temp Fall 1.3 °C 16:40 1.8 °C 3.5 °C, 2019 1.3 °C, 2023
Max 1hr Hum Fall 11% 15:24 12% 19%, 2016 7%, 2017
Max 10m Wind Speed 14.5 mph 15:52 11.0 mph 14.5 mph, 2023 4.2 mph, 2021
Minimum Feels-like 2.8 °C 23:52 2.2 °C 11.6 °C, 2018 0.4 °C, 2015
Maximum Feels-like 16.4 °C 14:48 13.8 °C 29.0 °C, 2018 11.3 °C, 2015
Mean Feels-like 9.4 °C 8.2 °C 21.4 °C, 2018 6.3 °C, 2015
Air-frost Hrs 0 hrs 0.0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.8 °C (+0.3) 8.1 °C (-0.0) 17.2 °C (+8.7), 2018 4.8 °C (-3.7), 2012
Humidity Range 37% 34% 57%, 2018 23%, 2012
Pressure Range 2 hPa 8 hPa 14 hPa, 2013 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [55%]98 hrs (99%) [42%] 12.7 [100%], 2018 1 [8%], 2012
Wet Hours 038 hrs (129%) [8.3%] 5, 2012 0, 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 11.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th April 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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Webcam Summary of Cloud Conditions

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