Daily Report for 26th April 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.1 °C (-4.6) 06:09 5.4 °C (-0.6) 9.3 °C (+2.6), 2012 2.1 °C (-4.6), 2016
Maximum Temperature 9.5 °C (-6.1) 16:49 13.1 °C (-1.2) 20.8 °C (+5.2), 2020 9.5 °C (-6.1), 2016
Mean Temperature 5.3 °C (-5.3) 9.2 °C (-0.9) 13.1 °C, 2020 5.3 °C, 2017
Minimum Humidity 37% 17:10 46% 65%, 2015 32%, 2009
Maximum Humidity 85% 01:53 86% 96%, 2014 78%, 2017
Mean Humidity 62% 67% 82%, 2015 59%, 2009
Minimum Pressure 1007 hPa 12:03 1009 hPa 1024 hPa, 2011 984 hPa, 2012
Maximum Pressure 1010 hPa 22:40 1015 hPa 1028 hPa, 2021 1003 hPa, 2012
Mean Pressure 1008 hPa 1011 hPa 1025 hPa, 2010 994 hPa, 2012
Mean Wind Speed 6.4 mph (+1.5) 3.9 mph (-1.0) 10.7 mph, 2012 2.5 mph, 2020
Maximum Wind Speed 16.2 mph 19:03 11.7 mph 25.1 mph, 2012 8.6 mph, 2020
Maximum Gust 23.1 mph 14:18 18.1 mph 33.4 mph, 2012 13.5 mph, 2015
Mean Wind Direction NNW
Rainfall / Snow-melt approx. trace 47.1 mm (129%) 3.9, 2013
Maximum Hourly Rain n/a 2.6, 2015
Maximum 10-min Rain n/a 0.8, 2012
Maximum Rain Rate n/a 24, 2017
Minimum Dew Point -4.8 °C 17:10 0.2 °C 6.4 °C, 2010 -4.8 °C, 2016
Maximum Dew Point 1.5 °C 00:59 6.4 °C 11.7 °C, 2010 1.5 °C, 2016
Mean Dew Point -1.7 °C 3.1 °C 8.2 °C, 2010 -1.7 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.1 °C 06:09 5.8 °C 9.3 °C, 2012 2.1 °C, 2016
Day Maximum (09-21) 9.5 °C 16:49 13.1 °C 20.8 °C, 2020 9.5 °C, 2016
Max 10m Temp Rise 0.8 °C 16:41 0.6 °C 0.9 °C, 2017 0.3 °C, 2015
Max 1hr Temp Rise 2.1 °C 14:59 2.2 °C 4.7 °C, 2020 1.1 °C, 2015
Max 1hr Hum Rise 10% 18:21 10% 26%, 2018 5%, 2011
Max 10m Temp Fall 1.2 °C 13:47 0.6 °C 1.4 °C, 2017 0.3 °C, 2023
Max 1hr Temp Fall 1.9 °C 18:27 1.8 °C 2.8 °C, 2019 0.8 °C, 2023
Max 1hr Hum Fall 9% 10:47 14% 28%, 2018 7%, 2017
Max 10m Wind Speed 11.2 mph 19:10 8.6 mph 16.2 mph, 2012 6.1 mph, 2011
Minimum Feels-like -3.2 °C 06:03 2.9 °C 6.1 °C, 2010 -3.2 °C, 2016
Maximum Feels-like 8.0 °C 16:46 13.1 °C 20.8 °C, 2020 8.0 °C, 2016
Mean Feels-like 2.3 °C 8.2 °C 13.1 °C, 2020 2.3 °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 7.4 °C (-1.5) 7.8 °C (-0.6) 17.5 °C (+8.6), 2020 5.1 °C (-3.8), 2012
Humidity Range 48% 40% 61%, 2020 19%, 2011
Pressure Range 3 hPa 5 hPa 19 hPa, 2012 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [61%]117 hrs (84%) [36%] 13 [99%], 2020 0 [0%], 2015
Wet Hours 0.356 hrs (140%) [8.9%] 3.5, 2013 0, 2009
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Partly Cloudy
Events Snowfall: trace amount
Comments Poss pm Snow/icy Showers (w possible Thunder)
Extra Comments
Issues Wind data from Harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 26th April 2016.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose