Daily Report for 11th March 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.4 °C (+2.4) 03:27 2.7 °C (-1.0) 11.0 °C (+7.0), 2017 -2.4 °C (-6.4), 2023
Maximum Temperature 10.6 °C (+0.2) 10:24 7.8 °C (-2.2) 16.9 °C (+6.5), 2017 0.6 °C (-9.8), 2013
Mean Temperature 8.4 °C (+1.3) 5.2 °C (-1.6) 13.4 °C, 2017 -0.8 °C, 2013
Minimum Humidity 83% 10:25 72% 89%, 2024 46%, 2015
Maximum Humidity 96% 04:30 94% 97%, 2009 79%, 2013
Mean Humidity 92% 85% 93%, 2024 66%, 2019
Minimum Pressure 988 hPa 23:45 991 hPa 1034 hPa, 2012 988 hPa, 2018
Maximum Pressure 997 hPa 00:07 998 hPa 1038 hPa, 2012 997 hPa, 2018
Mean Pressure 992 hPa 994 hPa 1036 hPa, 2012 992 hPa, 2018
Mean Wind Speed 3.9 mph (-1.3) 6.4 mph (+1.2) 15.1 mph, 2021 1.4 mph, 2016
Maximum Wind Speed 11.9 mph 17:33 15.4 mph 29.5 mph, 2020 6.7 mph, 2016
Maximum Gust 19.6 mph 10:39 23.5 mph 45.6 mph, 2021 8.7 mph, 2012
Mean Wind Direction E
Rainfall 2.4 mm 19.5 mm (141%) 3.6 mm, 2022
Maximum Hourly Rain 2.4 mm 17:43 2.4 mm, 2018
Maximum 10-min Rain 2.0 mm 17:40 2.0 mm, 2018
Maximum Rain Rate 40 mm/h 17:32 40 mm/h, 2018
Minimum Dew Point 5.5 °C 01:17 0.4 °C 6.5 °C, 2017 -9.0 °C, 2013
Maximum Dew Point 8.5 °C 17:09 5.2 °C 11.0 °C, 2017 -2.6 °C, 2013
Mean Dew Point 7.1 °C 2.9 °C 9.0 °C, 2017 -6.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.4 °C 03:27 2.9 °C 11.0 °C, 2017 -2.4 °C, 2023
Day Maximum (09-21) 10.6 °C 10:24 7.7 °C 16.9 °C, 2017 0.2 °C, 2013
Max 10m Temp Rise 0.6 °C 10:15 0.4 °C 1.1 °C, 2011 0.2 °C, 2014
Max 1hr Temp Rise 2.1 °C 10:14 1.4 °C 2.8 °C, 2012 0.3 °C, 2024
Max 1hr Hum Rise 6% 18:10 7% 17%, 2023 2%, 2024
Max 10m Temp Fall 0.4 °C 10:34 0.3 °C 1.0 °C, 2020 0.1 °C, 2024
Max 1hr Temp Fall 1.1 °C 18:12 1.1 °C 2.3 °C, 2012 0.3 °C, 2024
Max 1hr Hum Fall 8% 09:56 9% 15%, 2023 2%, 2024
Max 10m Wind Speed 9.3 mph 11:02 12.0 mph 21.6 mph, 2021 3.8 mph, 2016
Minimum Feels-like 4.4 °C 05:35 -1.4 °C 11.4 °C, 2017 -11.0 °C, 2013
Maximum Feels-like 11.0 °C 16:34 6.8 °C 18.7 °C, 2017 -3.9 °C, 2013
Mean Feels-like 7.6 °C 2.5 °C 14.2 °C, 2017 -7.6 °C, 2013
Air-frost Hrs 0 hrs 4 hrs 20 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.2 °C (-2.2) 5.1 °C (-1.2) 11.9 °C (+5.5), 2009 1.1 °C (-5.3), 2024
Humidity Range 13% 22% 40%, 2009 7%, 2024
Pressure Range 8 hPa 7 hPa 16 hPa, 2021 1 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.7 [7%]14 hrs (36%) [12%] 9 [87%], 2016 0 [0%], 2022
Wet Hours 1
[Mean rain rate: 2.4 mm/h]		32 hrs (170%) [12%] 5, 2022 , 2009
Cloud Cover Overcast
Events None
Comments 1730 Heavy Shower; 07 Shower
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 11th March 2018.
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.
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Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose