Daily Report for 22nd April 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.6 °C (+2.3) 06:33 6.7 °C (+0.9) 12.1 °C (+5.8), 2018 2.3 °C (-4.0), 2010
Maximum Temperature 16.2 °C (+1.3) 17:52 16.0 °C (+1.9) 25.6 °C (+10.7), 2011 9.4 °C (-5.5), 2024
Mean Temperature 11.6 °C (+1.8) 11.3 °C (+1.4) 18.0 °C, 2011 7.0 °C, 2024
Minimum Humidity 44% 18:20 47% 67%, 2024 29%, 2019
Maximum Humidity 78% 10:44 77% 97%, 2023 75%, 2011
Mean Humidity 63% 60% 82%, 2014 50%, 2011
Minimum Pressure 1025 hPa 18:51 1021 hPa 1027 hPa, 2024 1002 hPa, 2019
Maximum Pressure 1028 hPa 06:55 1026 hPa 1033 hPa, 2015 1004 hPa, 2012
Mean Pressure 1027 hPa 1024 hPa 1030 hPa, 2015 1004 hPa, 2012
Mean Wind Speed 2.9 mph (-2.0) 3.8 mph (-1.1) 7.1 mph, 2022 2.7 mph, 2011
Maximum Wind Speed 9.2 mph 15:34 11.2 mph 18.5 mph, 2012 7.7 mph, 2024
Maximum Gust 11.5 mph 00:51 15.9 mph 25.1 mph, 2012 11.5 mph, 2017
Mean Wind Direction NNE
Rainfall 0.0 mm 0.4 mm (1%) 5.5 mm, 2016
Maximum Hourly Rain n/a 2.6, 2018
Maximum 10-min Rain n/a 1.3, 2018
Maximum Rain Rate n/a 13, 2018
Minimum Dew Point 2.1 °C 20:17 0.7 °C 6.7 °C, 2014 -3.6 °C, 2010
Maximum Dew Point 7.3 °C 11:50 6.6 °C 14.6 °C, 2018 2.4 °C, 2010
Mean Dew Point 4.7 °C 3.7 °C 11.8 °C, 2018 0.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.6 °C 06:33 6.8 °C 13.2 °C, 2018 2.3 °C, 2010
Day Maximum (09-21) 16.2 °C 17:52 16.0 °C 25.6 °C, 2011 9.4 °C, 2024
Max 10m Temp Rise 0.8 °C 11:50 0.6 °C 1.0 °C, 2019 0.2 °C, 2016
Max 1hr Temp Rise 2.2 °C 13:35 2.3 °C 3.6 °C, 2019 0.9 °C, 2016
Max 1hr Hum Rise 13% 21:15 7% 28%, 2012 5%, 2024
Max 10m Temp Fall 0.7 °C 20:58 0.5 °C 1.1 °C, 2012 0.3 °C, 2013
Max 1hr Temp Fall 2.8 °C 21:23 1.6 °C 4.3 °C, 2012 0.9 °C, 2024
Max 1hr Hum Fall 10% 13:49 8% 17%, 2014 3%, 2016
Max 10m Wind Speed 6.4 mph 14:35 8.3 mph 13.6 mph, 2018 5.8 mph, 2024
Minimum Feels-like 6.0 °C 06:47 4.8 °C 12.1 °C, 2018 -0.4 °C, 2021
Maximum Feels-like 16.2 °C 17:40 16.1 °C 25.8 °C, 2018 9.4 °C, 2024
Mean Feels-like 11.2 °C 11.0 °C 20.1 °C, 2018 5.5 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.6 °C (-1.0) 9.3 °C (+1.1) 16.4 °C (+7.8), 2019 5.2 °C (-3.4), 2016
Humidity Range 34% 30% 50%, 2012 24%, 2024
Pressure Range 3 hPa 6 hPa 13 hPa, 2019 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [39%]144 hrs (124%) [53%] 13 [101%], 2020 0 [0%], 2016
Wet Hours 01 hrs (3%) [0.2%] 10, 2016 0, 2009
Cloud Cover am: Overcast
pm: Partly Cloudy transitioned to Mostly Sunny
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 22nd April 2017.
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