Daily Report for 20th June 2019

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.4 °C (+2.1) 05:47 11.7 °C (+0.9) 17.6 °C (+6.3), 2017 7.3 °C (-4.0), 2010
Maximum Temperature 19.6 °C (-1.1) 17:10 19.3 °C (-0.5) 30.3 °C (+9.6), 2017 18.2 °C (-2.5), 2021
Mean Temperature 16.4 °C (+0.5) 15.3 °C (+0.2) 23.6 °C, 2017 12.4 °C, 2010
Minimum Humidity 52% 15:03 57% 80%, 2021 36%, 2012
Maximum Humidity 91% 02:34 90% 96%, 2021 75%, 2010
Mean Humidity 72% 76% 90%, 2021 58%, 2012
Minimum Pressure 1010 hPa 02:29 1009 hPa 1022 hPa, 2009 1009 hPa, 2011
Maximum Pressure 1017 hPa 23:54 1016 hPa 1024 hPa, 2009 1012 hPa, 2021
Mean Pressure 1013 hPa 1012 hPa 1023 hPa, 2009 1010 hPa, 2021
Mean Wind Speed 6.0 mph (+1.6) 5.1 mph (+0.7) 6.7 mph, 2018 1.8 mph, 2014
Maximum Wind Speed 13.6 mph 13:32 14.2 mph 13.9 mph, 2020 7.3 mph, 2010
Maximum Gust 21.9 mph 18:07 22.5 mph 21.9 mph, 2019 10.3 mph, 2010
Mean Wind Direction WSW
Rainfall 0.4 mm 52.3 mm (174%) 15.2 mm, 2016
Maximum Hourly Rain 0.2 mm 5.5 mm, 2016
Maximum 10-min Rain 0.2 mm 1.5 mm, 2015
Maximum Rain Rate n/a 42, 2015
Minimum Dew Point 8.1 °C 15:03 8.4 °C 13.3 °C, 2017 2.3 °C, 2010
Maximum Dew Point 14.3 °C 00:03 12.9 °C 18.1 °C, 2016 7.0 °C, 2010
Mean Dew Point 11.2 °C 10.7 °C 14.9 °C, 2018 5.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.4 °C 05:47 11.9 °C 17.6 °C, 2017 7.3 °C, 2010
Day Maximum (09-21) 19.6 °C 17:12 19.1 °C 30.3 °C, 2017 18.2 °C, 2021
Max 10m Temp Rise 0.5 °C 09:28 0.6 °C 1.5 °C, 2012 0.4 °C, 2015
Max 1hr Temp Rise 1.8 °C 08:08 2.0 °C 4.2 °C, 2012 1.4 °C, 2021
Max 1hr Hum Rise 10% 18:24 11% 14%, 2011 4%, 2021
Max 10m Temp Fall 0.5 °C 13:34 0.6 °C 0.7 °C, 2012 0.4 °C, 2010
Max 1hr Temp Fall 1.2 °C 18:15 1.8 °C 2.4 °C, 2017 1.2 °C, 2019
Max 1hr Hum Fall 9% 07:38 11% 17%, 2012 4%, 2015
Max 10m Wind Speed 10.4 mph 13:41 10.2 mph 10.6 mph, 2016 5.9 mph, 2017
Minimum Feels-like 15.3 °C 05:45 12.3 °C 20.6 °C, 2017 6.2 °C, 2010
Maximum Feels-like 21.0 °C 17:17 21.1 °C 34.6 °C, 2017 18.9 °C, 2010
Mean Feels-like 18.3 °C 16.9 °C 27.4 °C, 2017 12.0 °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 6.2 °C (-3.1) 7.5 °C (-1.4) 12.8 °C (+3.5), 2014 5.8 °C (-3.5), 2021
Humidity Range 39% 34% 52%, 2012 16%, 2021
Pressure Range 7 hPa 7 hPa 8 hPa, 2016 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [33%]82 hrs (69%) [27%] 11.5 [76%], 2017 0 [0%], 2021
Wet Hours 1
[Mean rain rate: 0.4 mm/h]
65 hrs (264%) [14%] 8, 2016 0, 2010
Cloud Cover Partly Cloudy
Events None
Comments o.night rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 17.0 °C
Notes
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 initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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