Daily Report for 24th April 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.2 °C (-1.2) 04:07 5.6 °C (-0.2) 12.4 °C (+6.0), 2011 2.7 °C (-3.8), 2016
Maximum Temperature 17.9 °C (+2.7) 16:56 15.8 °C (+1.7) 22.7 °C (+7.5), 2011 9.1 °C (-6.1), 2016
Mean Temperature 12.1 °C (+0.7) 10.7 °C (+0.7) 16.7 °C, 2011 6.5 °C, 2016
Minimum Humidity 48% 16:52 44% 63%, 2023 32%, 2010
Maximum Humidity 89% 07:08 85% 97%, 2012 71%, 2010
Mean Humidity 68% 64% 83%, 2023 51%, 2010
Minimum Pressure 1008 hPa 21:31 1020 hPa 1028 hPa, 2021 992 hPa, 2012
Maximum Pressure 1015 hPa 00:15 1028 hPa 1030 hPa, 2021 999 hPa, 2019
Mean Pressure 1011 hPa 1024 hPa 1029 hPa, 2021 995 hPa, 2019
Mean Wind Speed 5.2 mph (+0.3) 4.9 mph (-0.0) 8.4 mph, 2018 1.5 mph, 2014
Maximum Wind Speed 14.5 mph 16:39 12.5 mph 20.4 mph, 2018 7.4 mph, 2014
Maximum Gust 19.4 mph 14:06 17.4 mph 31.1 mph, 2018 11.4 mph, 2014
Mean Wind Direction SW
Rainfall 0.0 mm 10.0 mm (30%) 8.1 mm, 2023
Maximum Hourly Rain n/a 4.8, 2023
Maximum 10-min Rain n/a 2.4, 2023
Maximum Rain Rate n/a 14.4, 2023
Minimum Dew Point 2.3 °C 01:54 0.5 °C 7.5 °C, 2011 -6.3 °C, 2017
Maximum Dew Point 8.8 °C 23:49 7.1 °C 13.4 °C, 2019 2.8 °C, 2024
Mean Dew Point 5.9 °C 3.7 °C 10.0 °C, 2011 -0.1 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.2 °C 04:07 5.8 °C 12.4 °C, 2011 2.7 °C, 2016
Day Maximum (09-21) 17.9 °C 16:56 15.8 °C 22.7 °C, 2011 9.1 °C, 2016
Max 10m Temp Rise 0.8 °C 07:31 0.6 °C 1.5 °C, 2009 0.5 °C, 2011
Max 1hr Temp Rise 3.0 °C 10:08 2.4 °C 3.2 °C, 2010 1.4 °C, 2012
Max 1hr Hum Rise 9% 21:31 9% 23%, 2018 6%, 2010
Max 10m Temp Fall 0.4 °C 00:58 0.6 °C 0.9 °C, 2023 0.3 °C, 2012
Max 1hr Temp Fall 1.6 °C 01:48 2.0 °C 3.5 °C, 2020 1.3 °C, 2014
Max 1hr Hum Fall 17% 10:23 13% 22%, 2016 8%, 2023
Max 10m Wind Speed 10.5 mph 12:51 9.6 mph 15.5 mph, 2019 5.6 mph, 2011
Minimum Feels-like 3.0 °C 04:20 3.3 °C 12.9 °C, 2011 -0.9 °C, 2016
Maximum Feels-like 17.9 °C 16:54 15.9 °C 24.8 °C, 2011 8.8 °C, 2016
Mean Feels-like 12.0 °C 10.1 °C 18.0 °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 12.7 °C (+4.0) 10.2 °C (+1.9) 17.9 °C (+9.2), 2010 5.9 °C (-2.8), 2018
Humidity Range 41% 41% 50%, 2012 25%, 2019
Pressure Range 7 hPa 7 hPa 12 hPa, 2009 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [54%]172 hrs (135%) [58%] 13 [100%], 2021 0 [0%], 2018
Wet Hours 018 hrs (48%) [3.1%] 5, 2023 0, 2009
Cloud Cover am: Mostly Cloudy transitioned to Hazy
pm: Partly Cloudy or Hazy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 24th April 2015.
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