Daily Report for 17th April 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.4 °C (-4.6) 03:11 5.9 °C (+0.2) 10.4 °C (+4.4), 2018 -0.3 °C (-6.3), 2021
Maximum Temperature 11.8 °C (-2.7) 18:48 13.7 °C (-0.2) 19.8 °C (+5.3), 2022 10.8 °C (-3.7), 2009
Mean Temperature 6.7 °C (-3.7) 9.7 °C (+0.0) 14.7 °C, 2018 6.7 °C, 2016
Minimum Humidity 37% 18:33 47% 94%, 2009 27%, 2022
Maximum Humidity 87% 06:36 87% 97%, 2009 66%, 2014
Mean Humidity 61% 68% 96%, 2009 54%, 2014
Minimum Pressure 1010 hPa 01:02 1005 hPa 1027 hPa, 2023 993 hPa, 2012
Maximum Pressure 1020 hPa 23:32 1010 hPa 1032 hPa, 2021 1014 hPa, 2009
Mean Pressure 1014 hPa 1007 hPa 1030 hPa, 2021 1006 hPa, 2012
Mean Wind Speed 2.8 mph (-2.1) 3.7 mph (-1.2) 9.0 mph, 2018 1.6 mph, 2021
Maximum Wind Speed 7.8 mph 10:19 11.5 mph 22.3 mph, 2012 6.8 mph, 2010
Maximum Gust 10.4 mph 11:23 17.9 mph 33.5 mph, 2012 9.5 mph, 2010
Mean Wind Direction NNW
Rainfall 0.0 mm 39.4 mm (166%) 7.7 mm, 2009
Maximum Hourly Rain n/a 2.7, 2009
Maximum 10-min Rain n/a 1.4, 2009
Maximum Rain Rate n/a 32.8, 2009
Minimum Dew Point -3.9 °C 20:31 1.2 °C 7.0 °C, 2009 -3.9 °C, 2016
Maximum Dew Point 2.8 °C 09:32 7.3 °C 11.2 °C, 2013 1.2 °C, 2021
Mean Dew Point -1.0 °C 3.9 °C 8.4 °C, 2009 -1.0 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.4 °C 03:11 6.3 °C 10.4 °C, 2018 -0.3 °C, 2021
Day Maximum (09-21) 11.8 °C 18:48 13.7 °C 19.8 °C, 2022 10.8 °C, 2009
Max 10m Temp Rise 0.6 °C 14:17 0.6 °C 1.1 °C, 2012 0.3 °C, 2009
Max 1hr Temp Rise 2.6 °C 08:05 2.4 °C 4.9 °C, 2010 1.0 °C, 2009
Max 1hr Hum Rise 9% 21:41 10% 25%, 2012 1%, 2009
Max 10m Temp Fall 0.6 °C 15:22 0.6 °C 1.7 °C, 2012 0.3 °C, 2009
Max 1hr Temp Fall 2.3 °C 20:26 1.7 °C 4.5 °C, 2012 0.8 °C, 2009
Max 1hr Hum Fall 16% 10:24 15% 31%, 2012 1%, 2009
Max 10m Wind Speed 5.3 mph 10:24 8.6 mph 16.5 mph, 2018 5.3 mph, 2016
Minimum Feels-like -2.0 °C 03:35 3.7 °C 10.4 °C, 2018 -2.0 °C, 2016
Maximum Feels-like 11.8 °C 18:43 13.9 °C 20.2 °C, 2018 11.6 °C, 2024
Mean Feels-like 5.9 °C 8.9 °C 15.3 °C, 2018 5.8 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 1 hrs, 2021 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.4 °C (+2.0) 7.8 °C (-0.4) 15.1 °C (+6.7), 2010 3.1 °C (-5.3), 2009
Humidity Range 50% 40% 64%, 2022 3%, 2009
Pressure Range 10 hPa 6 hPa 25 hPa, 2012 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [79%]71 hrs (80%) [34%] 12.5 [99%], 2010 0 [0%], 2009
Wet Hours 041 hrs (157%) [10%] 8, 2009 0, 2010
Cloud Cover am: Sunny transitioned to
pm: Mostly Sunny
Events None
Comments -
Extra Comments
Issues Wind sensor out 12-; Harpenden data from 18
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose