Daily Report for 27th May 2019

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.0 °C (-0.4) 05:13 7.6 °C (-1.3) 15.1 °C (+4.7), 2017 7.5 °C (-2.9), 2015
Maximum Temperature 18.8 °C (-0.1) 14:47 17.4 °C (-0.2) 27.1 °C (+8.2), 2018 13.2 °C (-5.8), 2014
Mean Temperature 14.2 °C (-0.3) 12.6 °C (-0.7) 20.7 °C, 2018 11.5 °C, 2009
Minimum Humidity 49% 16:19 49% 89%, 2014 29%, 2012
Maximum Humidity 92% 01:22 89% 97%, 2014 65%, 2013
Mean Humidity 69% 70% 94%, 2014 47%, 2013
Minimum Pressure 1009 hPa 23:30 1014 hPa 1035 hPa, 2020 1004 hPa, 2013
Maximum Pressure 1013 hPa 00:18 1021 hPa 1037 hPa, 2020 1011 hPa, 2010
Mean Pressure 1011 hPa 1017 hPa 1036 hPa, 2020 1009 hPa, 2013
Mean Wind Speed 6.5 mph (+1.8) 3.4 mph (-1.3) 8.7 mph, 2025 1.6 mph, 2021
Maximum Wind Speed 16.1 mph 13:50 11.9 mph 19.2 mph, 2013 7.9 mph, 2021
Maximum Gust 24.2 mph 13:57 18.6 mph 30.0 mph, 2025 11.4 mph, 2021
Mean Wind Direction W
Rainfall 0.0 mm 30.7 mm (77%) 9.0 mm, 2025
Maximum Hourly Rain n/a 3.4, 2025
Maximum 10-min Rain n/a 1.8, 2018
Maximum Rain Rate n/a 40, 2018
Minimum Dew Point 6.8 °C 16:28 3.9 °C 12.8 °C, 2018 0.4 °C, 2013
Maximum Dew Point 10.1 °C 10:43 9.3 °C 19.4 °C, 2018 5.3 °C, 2013
Mean Dew Point 8.3 °C 6.9 °C 16.1 °C, 2018 2.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.0 °C 04:47 7.8 °C 15.1 °C, 2017 7.5 °C, 2015
Day Maximum (09-21) 18.8 °C 14:48 17.4 °C 27.1 °C, 2018 13.2 °C, 2014
Max 10m Temp Rise 0.9 °C 10:39 0.7 °C 0.9 °C, 2019 0.2 °C, 2014
Max 1hr Temp Rise 3.1 °C 10:53 2.5 °C 3.3 °C, 2018 0.6 °C, 2014
Max 1hr Hum Rise 9% 22:54 13% 15%, 2018 2%, 2014
Max 10m Temp Fall 0.6 °C 14:00 0.7 °C 1.1 °C, 2017 0.2 °C, 2009
Max 1hr Temp Fall 1.3 °C 15:47 2.1 °C 2.7 °C, 2017 0.8 °C, 2009
Max 1hr Hum Fall 13% 10:53 13% 15%, 2010 4%, 2009
Max 10m Wind Speed 12.7 mph 13:56 8.5 mph 13.5 mph, 2017 5.2 mph, 2021
Minimum Feels-like 10.3 °C 04:17 6.3 °C 16.9 °C, 2017 5.3 °C, 2013
Maximum Feels-like 19.3 °C 13:37 18.2 °C 33.7 °C, 2018 15.4 °C, 2014
Mean Feels-like 14.7 °C 12.9 °C 25.4 °C, 2018 12.3 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.8 °C (+0.3) 9.9 °C (+1.1) 13.2 °C (+4.7), 2012 2.9 °C (-5.6), 2025
Humidity Range 43% 40% 46%, 2010 8%, 2014
Pressure Range 4 hPa 7 hPa 12 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.4 [23%]166 hrs (101%) [44%] 14.7 [101%], 2012 0 [0%], 2009
Wet Hours 027 hrs (76%) [4.1%] 10, 2014 0, 2011
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments -
Extra Comments
Issues server CPU pegged - some data issues -8
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 17.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th May 2019.
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose