Daily Report for 23rd April 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.4 °C (+2.0) 06:07 8.4 °C (+2.5) 11.7 °C (+5.3), 2019 1.7 °C (-4.7), 2021
Maximum Temperature 16.2 °C (+1.1) 16:45 15.9 °C (+1.9) 26.5 °C (+11.4), 2011 9.8 °C (-5.2), 2016
Mean Temperature 12.6 °C (+1.6) 12.0 °C (+2.2) 18.6 °C, 2011 6.7 °C, 2016
Minimum Humidity 52% 15:00 61% 68%, 2024 23%, 2021
Maximum Humidity 85% 06:26 89% 95%, 2012 68%, 2017
Mean Humidity 68% 77% 84%, 2023 52%, 2011
Minimum Pressure 1013 hPa 00:06 1008 hPa 1029 hPa, 2021 990 hPa, 2012
Maximum Pressure 1018 hPa 13:19 1015 hPa 1031 hPa, 2021 1002 hPa, 2012
Mean Pressure 1016 hPa 1011 hPa 1030 hPa, 2021 996 hPa, 2012
Mean Wind Speed 7.8 mph (+2.9) 5.1 mph (+0.2) 7.8 mph, 2018 1.7 mph, 2011
Maximum Wind Speed 16.6 mph 15:40 13.5 mph 21.5 mph, 2012 7.6 mph, 2010
Maximum Gust 25.3 mph 18:29 20.9 mph 28.5 mph, 2022 10.7 mph, 2015
Mean Wind Direction WSW
Rainfall 0.0 mm 42.1 mm (131%) 4.1 mm, 2023
Maximum Hourly Rain n/a 3.1, 2023
Maximum 10-min Rain n/a 2.4, 2023
Maximum Rain Rate n/a 30, 2023
Minimum Dew Point 5.4 °C 00:58 5.2 °C 6.7 °C, 2019 -6.3 °C, 2021
Maximum Dew Point 8.2 °C 21:41 9.8 °C 11.6 °C, 2019 3.5 °C, 2010
Mean Dew Point 6.6 °C 7.7 °C 8.2 °C, 2019 0.1 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.4 °C 06:03 8.5 °C 11.7 °C, 2019 1.7 °C, 2021
Day Maximum (09-21) 16.2 °C 16:44 15.9 °C 26.5 °C, 2011 9.8 °C, 2016
Max 10m Temp Rise 0.8 °C 11:42 0.5 °C 1.4 °C, 2011 0.5 °C, 2013
Max 1hr Temp Rise 1.9 °C 07:41 1.8 °C 4.9 °C, 2011 1.5 °C, 2022
Max 1hr Hum Rise 8% 02:00 8% 14%, 2012 5%, 2009
Max 10m Temp Fall 0.4 °C 09:47 0.5 °C 1.2 °C, 2009 0.4 °C, 2013
Max 1hr Temp Fall 1.3 °C 01:18 1.6 °C 2.7 °C, 2009 1.3 °C, 2018
Max 1hr Hum Fall 10% 11:25 9% 20%, 2021 5%, 2017
Max 10m Wind Speed 12.3 mph 15:03 10.1 mph 12.3 mph, 2018 7.4 mph, 2020
Minimum Feels-like 5.6 °C 06:32 6.3 °C 11.8 °C, 2019 -0.9 °C, 2016
Maximum Feels-like 16.2 °C 16:26 16.8 °C 26.9 °C, 2011 9.5 °C, 2016
Mean Feels-like 12.2 °C 11.9 °C 19.0 °C, 2011 4.9 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.8 °C (-0.9) 7.6 °C (-0.7) 16.4 °C (+7.7), 2011 3.9 °C (-4.8), 2012
Humidity Range 33% 27% 69%, 2021 24%, 2024
Pressure Range 5 hPa 7 hPa 12 hPa, 2012 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [27%]96 hrs (79%) [34%] 13 [100%], 2010 0 [0%], 2019
Wet Hours 057 hrs (160%) [10%] 7, 2012 0, 2009
Cloud Cover am: Mostly Sunny transitioned to Mostly Cloudy
pm: Overcast or Hazy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 23rd April 2018.
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