Daily Report for 4th March 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.0 °C (-0.5) 15:07 5.1 °C (+1.6) 7.5 °C (+4.0), 2017 -1.0 °C (-4.5), 2010
Maximum Temperature 9.3 °C (-0.6) 11:50 11.7 °C (+1.9) 12.1 °C (+2.2), 2025 5.3 °C (-4.6), 2021
Mean Temperature 6.3 °C (-0.6) 8.2 °C (+1.7) 9.2 °C, 2017 2.9 °C, 2010
Minimum Humidity 70% 23:59 63% 86%, 2022 36%, 2025
Maximum Humidity 94% 10:30 95% 98%, 2014 81%, 2015
Mean Humidity 88% 84% 90%, 2018 62%, 2015
Minimum Pressure 1011 hPa 13:26 1018 hPa 1031 hPa, 2011 980 hPa, 2009
Maximum Pressure 1021 hPa 00:58 1025 hPa 1038 hPa, 2015 986 hPa, 2009
Mean Pressure 1016 hPa 1022 hPa 1033 hPa, 2011 983 hPa, 2009
Mean Wind Speed 6.5 mph (+1.3) 4.3 mph (-0.9) 8.4 mph, 2019 2.3 mph, 2014
Maximum Wind Speed 16.6 mph 11.4 mph 21.8 mph, 2019 8.5 mph, 2025
Maximum Gust 26.3 mph 22:53 16.6 mph 30.0 mph, 2019 12.5 mph, 2022
Mean Wind Direction WSW
Rainfall 11.2 mm 11.3 mm (225%) 16.0 mm, 2009
Maximum Hourly Rain 4.1 mm 13:26 6.0 mm, 2009
Maximum 10-min Rain 1.5 mm 13:19 1.5 mm, 2012
Maximum Rain Rate 15 mm/h 13:20 18 mm/h, 2020
Minimum Dew Point -1.1 °C 23:59 1.2 °C 3.6 °C, 2022 -5.1 °C, 2010
Maximum Dew Point 8.2 °C 11:31 8.2 °C 8.2 °C, 2012 0.6 °C, 2011
Mean Dew Point 4.3 °C 5.4 °C 5.7 °C, 2022 -1.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.4 °C * 00:00 6.5 °C 7.9 °C, 2022 -1.0 °C, 2025
Day Maximum (09-21) 9.3 °C 11:50 11.7 °C 12.1 °C, 2025 5.2 °C, 2021
Max 10m Temp Rise 0.3 °C 11:25 0.4 °C 1.1 °C, 2025 0.2 °C, 2021
Max 1hr Temp Rise 0.7 °C 11:25 1.4 °C 4.5 °C, 2025 0.3 °C, 2022
Max 1hr Hum Rise 8% 15:11 7% 18%, 2025 2%, 2022
Max 10m Temp Fall 1.2 °C 13:31 0.7 °C 1.8 °C, 2019 0.2 °C, 2018
Max 1hr Temp Fall 4.8 °C 14:13 2.5 °C 4.8 °C, 2012 0.7 °C, 2021
Max 1hr Hum Fall 10% 21:07 13% 16%, 2025 3%, 2022
Max 10m Wind Speed 11.2 mph 21:20 8.3 mph 16.0 mph, 2019 6.6 mph, 2020
Minimum Feels-like -2.4 °C 15:02 2.8 °C 3.4 °C, 2017 -4.5 °C, 2011
Maximum Feels-like 9.7 °C 12:07 11.9 °C 12.1 °C, 2025 5.3 °C, 2021
Mean Feels-like 3.8 °C 7.2 °C 7.8 °C, 2017 0.5 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 5 hrs, 2025 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.3 °C (-0.1) 6.6 °C (+0.3) 13.1 °C (+6.7), 2025 2.1 °C (-4.3), 2021
Humidity Range 24% 32% 56%, 2025 5%, 2022
Pressure Range 10 hPa 7 hPa 17 hPa, 2015 2 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]14 hrs (103%) [35%] 10 [100%], 2025 0 [0%], 2012
Wet Hours 14
[Mean rain rate: 0.8 mm/h]		14 hrs (209%) [15%] 14, 2012 , 2009
Cloud Cover Overcast
Events None
Comments 05-20 Light Rain (13 Heavy)
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 4th March 2012.
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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

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Wind rose