Daily Report for 12th March 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.5 °C (+0.4) 06:50 4.9 °C (+1.1) 9.3 °C (+5.2), 2017 -2.2 °C (-6.3), 2013
Maximum Temperature 12.8 °C (+2.2) 15:16 11.6 °C (+1.4) 14.9 °C (+4.3), 2014 3.9 °C (-6.7), 2013
Mean Temperature 8.3 °C (+1.3) 8.1 °C (+1.3) 11.2 °C, 2017 0.7 °C, 2013
Minimum Humidity 71% 15:50 61% 90%, 2024 28%, 2015
Maximum Humidity 96% 07:37 90% 97%, 2024 76%, 2015
Mean Humidity 85% 78% 93%, 2024 50%, 2015
Minimum Pressure 1034 hPa 03:04 1024 hPa 1034 hPa, 2012 986 hPa, 2018
Maximum Pressure 1036 hPa 14:55 1030 hPa 1036 hPa, 2012 1000 hPa, 2018
Mean Pressure 1035 hPa 1027 hPa 1035 hPa, 2012 990 hPa, 2018
Mean Wind Speed 2.4 mph (-2.8) 4.9 mph (-0.3) 11.4 mph, 2020 1.5 mph, 2017
Maximum Wind Speed 8.1 mph 12.0 mph 25.6 mph, 2013 6.4 mph, 2014
Maximum Gust 11.2 mph 19:44 17.8 mph 39.3 mph, 2013 8.7 mph, 2014
Mean Wind Direction NE
Rainfall 0.0 mm 16.8 mm (111%) 12.4 mm, 2024
Maximum Hourly Rain n/a 4.2, 2019
Maximum 10-min Rain n/a 2.6, 2019
Maximum Rain Rate n/a 53, 2019
Minimum Dew Point 3.7 °C 05:26 1.1 °C 6.7 °C, 2009 -10.3 °C, 2013
Maximum Dew Point 8.0 °C 14:51 6.8 °C 12.1 °C, 2024 -0.9 °C, 2013
Mean Dew Point 5.8 °C 4.2 °C 9.0 °C, 2024 -6.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.5 °C 06:49 5.5 °C 9.3 °C, 2017 -2.2 °C, 2013
Day Maximum (09-21) 12.8 °C 15:15 11.6 °C 14.9 °C, 2014 3.9 °C, 2013
Max 10m Temp Rise 0.6 °C 07:26 0.5 °C 0.8 °C, 2020 0.3 °C, 2019
Max 1hr Temp Rise 2.6 °C 08:14 1.7 °C 2.8 °C, 2020 0.8 °C, 2019
Max 1hr Hum Rise 6% 19:17 6% 17%, 2020 2%, 2024
Max 10m Temp Fall 0.4 °C 18:39 0.5 °C 2.0 °C, 2025 0.2 °C, 2017
Max 1hr Temp Fall 1.6 °C 18:57 1.8 °C 4.1 °C, 2019 0.5 °C, 2024
Max 1hr Hum Fall 9% 08:57 10% 19%, 2020 2%, 2024
Max 10m Wind Speed 6.2 mph 18:42 8.7 mph 20.6 mph, 2013 3.8 mph, 2016
Minimum Feels-like 4.5 °C 06:45 2.3 °C 9.0 °C, 2017 -10.8 °C, 2013
Maximum Feels-like 13.2 °C 15:03 11.8 °C 15.0 °C, 2024 1.7 °C, 2013
Mean Feels-like 7.9 °C 6.9 °C 11.5 °C, 2017 -4.7 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 9 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.3 °C (+1.8) 6.6 °C (+0.2) 11.9 °C (+5.4), 2014 3.1 °C (-3.4), 2017
Humidity Range 25% 29% 48%, 2015 7%, 2024
Pressure Range 2 hPa 6 hPa 22 hPa, 2019 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [95%]45 hrs (108%) [37%] 10 [95%], 2012 0 [0%], 2009
Wet Hours 020 hrs (99%) [7%] 10, 2024 , 2009
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Sunny
Events Maximum possible sunshine
Comments -
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 12th 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

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Webcam Summary of Cloud Conditions

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Wind rose