Daily Report for 25th August 2019

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.8 °C (+3.0) 06:46 14.1 °C (+0.8) 18.5 °C (+5.7), 2016 7.8 °C (-5.0), 2018
Maximum Temperature 31.9 °C (+10.1) 14:38 23.3 °C (+1.0) 31.9 °C (+10.1), 2019 16.8 °C (-5.0), 2014
Mean Temperature 23.5 °C (+6.5) 18.6 °C (+0.9) 23.5 °C, 2019 12.5 °C, 2018
Minimum Humidity 32% 15:33 52% 71%, 2020 32%, 2019
Maximum Humidity 89% 07:20 90% 98%, 2013 85%, 2016
Mean Humidity 62% 73% 87%, 2014 62%, 2019
Minimum Pressure 1018 hPa 05:14 1012 hPa 1024 hPa, 2021 998 hPa, 2020
Maximum Pressure 1020 hPa 23:34 1018 hPa 1030 hPa, 2021 1006 hPa, 2012
Mean Pressure 1019 hPa 1015 hPa 1027 hPa, 2021 1002 hPa, 2012
Mean Wind Speed 1.7 mph (-2.3) 5.2 mph (+1.2) 9.8 mph, 2020 1.0 mph, 2017
Maximum Wind Speed 7.6 mph 15:56 13.6 mph 26.5 mph, 2020 6.9 mph, 2014
Maximum Gust 11.5 mph 14:33 22.0 mph 39.2 mph, 2020 10.2 mph, 2014
Mean Wind Direction SE
Rainfall 0.0 mm 36.6 mm (91%) 38.5 mm, 2014
Maximum Hourly Rain n/a 9.2, 2014
Maximum 10-min Rain n/a 3.3, 2014
Maximum Rain Rate n/a 36, 2014
Minimum Dew Point 12.9 °C 02:45 11.3 °C 15.7 °C, 2016 6.6 °C, 2018
Maximum Dew Point 17.7 °C 10:28 15.6 °C 19.0 °C, 2016 11.6 °C, 2018
Mean Dew Point 14.8 °C 13.4 °C 17.1 °C, 2016 8.4 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.8 °C 06:46 14.3 °C 18.5 °C, 2016 7.8 °C, 2018
Day Maximum (09-21) 31.9 °C 14:38 23.3 °C 31.9 °C, 2019 16.8 °C, 2014
Max 10m Temp Rise 0.8 °C 09:09 0.6 °C 0.8 °C, 2019 0.2 °C, 2014
Max 1hr Temp Rise 4.2 °C 09:53 2.4 °C 4.2 °C, 2019 1.0 °C, 2014
Max 1hr Hum Rise 10% 21:29 12% 24%, 2009 6%, 2014
Max 10m Temp Fall 0.6 °C 20:10 0.7 °C 1.3 °C, 2018 0.2 °C, 2014
Max 1hr Temp Fall 2.8 °C 20:31 2.0 °C 3.3 °C, 2009 0.4 °C, 2014
Max 1hr Hum Fall 15% 10:43 12% 18%, 2013 1%, 2014
Max 10m Wind Speed 5.9 mph 15:36 10.2 mph 17.6 mph, 2020 4.6 mph, 2017
Minimum Feels-like 18.7 °C 03:35 16.4 °C 22.9 °C, 2016 5.0 °C, 2018
Maximum Feels-like 36.0 °C 17:44 26.6 °C 36.0 °C, 2019 18.9 °C, 2018
Mean Feels-like 27.4 °C 21.7 °C 27.8 °C, 2016 12.5 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 16.1 °C (+7.1) 9.2 °C (+0.2) 16.1 °C (+7.1), 2019 3.3 °C (-5.7), 2014
Humidity Range 57% 38% 57%, 2019 21%, 2020
Pressure Range 2 hPa 6 hPa 15 hPa, 2020 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10.5 [82%]149 hrs (98%) [45%] 12.5 [98%], 2017 0 [0%], 2014
Wet Hours 034 hrs (111%) [5.7%] 16, 2014 0, 2017
Cloud Cover Sunny with periods of Mostly Sunny
Events None
Comments -
Extra Comments nice sunrise
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 20.0 °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