Daily Report for 10th January 2021

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.1 °C (-4.5) 01:11 -0.3 °C (-2.7) 9.0 °C (+6.6), 2012 -3.5 °C (-5.9), 2009
Maximum Temperature 3.7 °C (-3.3) 23:05 3.8 °C (-3.2) 13.8 °C (+6.8), 2015 -2.0 °C (-9.0), 2009
Mean Temperature 0.9 °C (-3.9) 1.8 °C (-3.0) 10.1 °C, 2012 -2.8 °C, 2009
Minimum Humidity 89% 23:17 84% 95%, 2013 48%, 2015
Maximum Humidity 96% 09:17 94% 98%, 2013 84%, 2017
Mean Humidity 93% 90% 97%, 2013 70%, 2015
Minimum Pressure 1024 hPa 23:56 1018 hPa 1032 hPa, 2012 982 hPa, 2016
Maximum Pressure 1029 hPa 00:02 1022 hPa 1034 hPa, 2012 987 hPa, 2016
Mean Pressure 1027 hPa 1020 hPa 1033 hPa, 2012 984 hPa, 2016
Mean Wind Speed 2.4 mph (-2.8) 3.4 mph (-1.8) 10.8 mph, 2015 0.7 mph, 2013
Maximum Wind Speed 7.4 mph 00:33 9.6 mph 25.9 mph, 2015 4.9 mph, 2013
Maximum Gust 11.4 mph 00:33 14.8 mph 36.9 mph, 2015 6.7 mph, 2013
Mean Wind Direction WNW
Rainfall 0.0 mm 1.6 mm (9%) 1.3 mm, 2016
Maximum Hourly Rain n/a 0.9, 2016
Maximum 10-min Rain n/a 0.5, 2015
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point -2.9 °C 01:05 -1.5 °C 5.6 °C, 2012 -3.1 °C, 2015
Maximum Dew Point 2.2 °C 22:27 2.0 °C 11.1 °C, 2015 0.2 °C, 2010
Mean Dew Point -0.2 °C 0.3 °C 7.7 °C, 2012 -3.7 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -2.1 °C 00:51 0.4 °C 12.0 °C, 2015 -3.5 °C, 2009
Day Maximum (09-21) * 3.5 °C * 20:23 3.8 °C 13.5 °C, 2015 -2.0 °C, 2009
Max 10m Temp Rise 0.2 °C 01:31 0.3 °C 0.5 °C, 2014 0.1 °C, 2010
Max 1hr Temp Rise 0.9 °C 12:25 0.9 °C 2.2 °C, 2014 0.4 °C, 2010
Max 1hr Hum Rise 1% 01:13 4% 8%, 2011 1%, 2013
Max 10m Temp Fall 0.2 °C 00:17 0.3 °C 1.3 °C, 2015 0.1 °C, 2010
Max 1hr Temp Fall 0.2 °C 01:01 0.9 °C 2.8 °C, 2015 0.2 °C, 2021
Max 1hr Hum Fall 3% 13:14 4% 18%, 2015 2%, 2010
Max 10m Wind Speed 5.5 mph 00:54 7.7 mph 18.3 mph, 2015 3.7 mph, 2013
Minimum Feels-like -7.6 °C 00:33 -5.0 °C 6.3 °C, 2012 -7.6 °C, 2021
Maximum Feels-like 3.7 °C 22:22 3.4 °C 15.5 °C, 2015 1.5 °C, 2010
Mean Feels-like -1.2 °C -0.6 °C 9.7 °C, 2012 -2.4 °C, 2010
Air-frost Hrs 11 hrs 5 hrs 11 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.8 °C (+1.2) 4.1 °C (-0.5) 9.8 °C (+5.2), 2015 1.1 °C (-3.5), 2010
Humidity Range 7% 10% 41%, 2015 3%, 2013
Pressure Range 5 hPa 4 hPa 21 hPa, 2020 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]17 hrs (92%) [24%] 4 [55%], 2014 0 [0%], 2009
Wet Hours 05.8 hrs (27%) [2.4%] 2, 2011 , 2009
Cloud Cover Overcast
Events Air Frost
Comments light am fog
Extra Comments
Issues no pond temp due to lockdown
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.5 °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