Daily Report for 4th July 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.6 °C (-1.8) 05:13 12.0 °C (-0.3) 17.6 °C (+5.2), 2015 10.6 °C (-1.8), 2019
Maximum Temperature 26.6 °C (+4.8) 17:18 23.5 °C (+1.7) 26.7 °C (+4.9), 2014 20.0 °C (-1.8), 2020
Mean Temperature 19.6 °C (+1.5) 18.1 °C (+0.7) 21.8 °C, 2015 17.3 °C, 2016
Minimum Humidity 36% 16:05 44% 79%, 2020 33%, 2014
Maximum Humidity 91% 06:00 86% 96%, 2012 66%, 2011
Mean Humidity 60% 63% 86%, 2020 47%, 2011
Minimum Pressure 1022 hPa 23:35 1023 hPa 1022 hPa, 2019 1003 hPa, 2014
Maximum Pressure 1029 hPa 01:50 1027 hPa 1029 hPa, 2019 1012 hPa, 2012
Mean Pressure 1026 hPa 1025 hPa 1026 hPa, 2019 1008 hPa, 2014
Mean Wind Speed 1.5 mph (-2.8) 3.4 mph (-0.9) 9.3 mph, 2020 1.5 mph, 2019
Maximum Wind Speed 7.1 mph 16:21 10.3 mph 17.6 mph, 2016 7.1 mph, 2019
Maximum Gust 10.4 mph 00:36 16.2 mph 30.0 mph, 2020 10.4 mph, 2019
Mean Wind Direction NE
Rainfall 0.0 mm 0.0 mm (0%) 9.5 mm, 2012
Maximum Hourly Rain n/a 2.8, 2012
Maximum 10-min Rain n/a 2.3, 2015
Maximum Rain Rate n/a 72, 2015
Minimum Dew Point 8.7 °C 04:49 8.8 °C 14.5 °C, 2012 5.9 °C, 2014
Maximum Dew Point 13.4 °C 23:24 12.6 °C 18.4 °C, 2015 9.8 °C, 2011
Mean Dew Point 10.9 °C 10.6 °C 15.7 °C, 2012 8.1 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.6 °C 05:16 12.0 °C 17.6 °C, 2015 10.6 °C, 2019
Day Maximum (09-21) 26.6 °C 17:20 23.5 °C 26.7 °C, 2014 20.0 °C, 2020
Max 10m Temp Rise 0.7 °C 06:06 0.6 °C 1.0 °C, 2009 0.4 °C, 2015
Max 1hr Temp Rise 3.0 °C 06:53 2.1 °C 3.2 °C, 2011 1.7 °C, 2012
Max 1hr Hum Rise 10% 21:57 8% 19%, 2018 5%, 2012
Max 10m Temp Fall 0.5 °C 20:19 0.6 °C 0.8 °C, 2009 0.3 °C, 2012
Max 1hr Temp Fall 2.5 °C 21:09 2.0 °C 2.5 °C, 2014 0.8 °C, 2012
Max 1hr Hum Fall 15% 08:36 12% 20%, 2015 6%, 2020
Max 10m Wind Speed 4.8 mph 00:11 6.9 mph 14.5 mph, 2016 4.8 mph, 2019
Minimum Feels-like 11.3 °C 05:13 12.9 °C 19.9 °C, 2012 11.3 °C, 2019
Maximum Feels-like 29.0 °C 17:23 25.6 °C 30.1 °C, 2015 22.8 °C, 2016
Mean Feels-like 21.3 °C 19.6 °C 25.4 °C, 2015 19.4 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 16.0 °C (+6.5) 11.5 °C (+2.0) 16.0 °C (+6.5), 2019 5.0 °C (-4.5), 2020
Humidity Range 55% 42% 55%, 2019 14%, 2020
Pressure Range 7 hPa 4 hPa 11 hPa, 2014 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 14 [93%]45 hrs (181%) [75%] 14 [93%], 2019 0 [0%], 2020
Wet Hours 00 hrs (0%) [0%] 7, 2012 0, 2009
Cloud Cover Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 21.0 °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.
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Webcam Summary of Cloud Conditions

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