Daily Report for 20th April 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.5 °C (+0.4) 01:45 7.1 °C (+1.3) 13.9 °C (+7.8), 2018 1.4 °C (-4.7), 2013
Maximum Temperature 13.2 °C (-1.4) 12:51 15.6 °C (+1.7) 25.9 °C (+11.3), 2018 10.6 °C (-4.0), 2024
Mean Temperature 9.8 °C (-0.5) 11.5 °C (+1.5) 20.0 °C, 2018 7.2 °C, 2024
Minimum Humidity 75% 00:02 49% 75%, 2014 33%, 2011
Maximum Humidity 95% 23:59 84% 95%, 2014 72%, 2017
Mean Humidity 90% 67% 90%, 2014 54%, 2011
Minimum Pressure 1003 hPa 16:00 1014 hPa 1032 hPa, 2017 990 hPa, 2012
Maximum Pressure 1014 hPa 00:30 1019 hPa 1037 hPa, 2017 995 hPa, 2012
Mean Pressure 1007 hPa 1016 hPa 1035 hPa, 2017 992 hPa, 2012
Mean Wind Speed 4.4 mph (-0.5) 4.3 mph (-0.6) 7.9 mph, 2020 1.0 mph, 2021
Maximum Wind Speed 14.3 mph 13:54 11.9 mph 18.4 mph, 2020 8.9 mph, 2021
Maximum Gust 19.4 mph 04:49 16.6 mph 28.8 mph, 2023 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 6.2 mm 15.2 mm (54%) 8.0 mm, 2012
Maximum Hourly Rain 3.0 mm 17:13 4.9 mm, 2012
Maximum 10-min Rain 0.9 mm 16:43 2.6 mm, 2012
Maximum Rain Rate 5 mm/h 16:36 30 mm/h, 2012
Minimum Dew Point 2.9 °C 00:03 2.5 °C 9.6 °C, 2018 -3.0 °C, 2010
Maximum Dew Point 11.5 °C 11:53 7.7 °C 14.1 °C, 2018 4.2 °C, 2013
Mean Dew Point 8.1 °C 5.2 °C 11.5 °C, 2018 -0.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.5 °C 01:45 7.5 °C 13.9 °C, 2018 1.4 °C, 2013
Day Maximum (09-21) 13.2 °C 12:51 15.6 °C 25.9 °C, 2018 10.6 °C, 2024
Max 10m Temp Rise 0.4 °C 09:04 0.6 °C 1.0 °C, 2013 0.4 °C, 2014
Max 1hr Temp Rise 1.6 °C 09:12 2.0 °C 4.2 °C, 2013 1.6 °C, 2014
Max 1hr Hum Rise 7% 01:04 8% 29%, 2023 4%, 2010
Max 10m Temp Fall 0.4 °C 20:27 0.4 °C 1.7 °C, 2012 0.4 °C, 2014
Max 1hr Temp Fall 1.6 °C 21:04 1.5 °C 4.3 °C, 2023 1.3 °C, 2017
Max 1hr Hum Fall 7% 09:23 12% 19%, 2013 1%, 2017
Max 10m Wind Speed 11.2 mph 14:00 8.7 mph 14.5 mph, 2023 5.7 mph, 2021
Minimum Feels-like 3.0 °C 02:01 5.6 °C 15.1 °C, 2018 -0.6 °C, 2024
Maximum Feels-like 15.0 °C 12:44 16.1 °C 28.6 °C, 2018 10.6 °C, 2024
Mean Feels-like 9.6 °C 11.5 °C 22.0 °C, 2018 5.4 °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 6.7 °C (-1.8) 8.5 °C (+0.3) 15.3 °C (+6.8), 2011 6.7 °C (-1.8), 2014
Humidity Range 20% 36% 56%, 2013 20%, 2014
Pressure Range 11 hPa 6 hPa 11 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]116 hrs (111%) [47%] 13 [102%], 2019 0 [0%], 2014
Wet Hours 5
[Mean rain rate: 1.2 mm/h]
16 hrs (52%) [3.3%] 5, 2014 0, 2009
Cloud Cover Overcast
Events None
Comments 1130-17 Rain
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 20th April 2014.
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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose