Daily Report for 27th March 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.2 °C (+1.1) 07:26 3.0 °C (-1.3) 6.7 °C (+1.6), 2010 -1.3 °C (-6.4), 2013
Maximum Temperature 14.0 °C (+1.8) 16:09 10.9 °C (+0.1) 18.2 °C (+6.0), 2012 3.4 °C (-8.8), 2013
Mean Temperature 9.4 °C (+1.5) 7.0 °C (-0.6) 11.3 °C, 2012 1.1 °C, 2013
Minimum Humidity 54% 16:30 58% 76%, 2022 34%, 2012
Maximum Humidity 87% 06:30 88% 95%, 2014 71%, 2012
Mean Humidity 73% 75% 86%, 2022 50%, 2012
Minimum Pressure 1013 hPa 17:17 1021 hPa 1035 hPa, 2012 978 hPa, 2024
Maximum Pressure 1015 hPa 12:00 1026 hPa 1038 hPa, 2012 984 hPa, 2024
Mean Pressure 1014 hPa 1024 hPa 1036 hPa, 2012 982 hPa, 2024
Mean Wind Speed 4.9 mph (-0.3) 4.7 mph (-0.5) 8.3 mph, 2021 1.5 mph, 2019
Maximum Wind Speed 11.5 mph 12.0 mph 22.7 mph, 2024 7.0 mph, 2019
Maximum Gust 15.4 mph 06:19 16.8 mph 34.4 mph, 2016 10.5 mph, 2017
Mean Wind Direction ENE
Rainfall 0.0 mm 5.4 mm (16%) 7.0 mm, 2016
Maximum Hourly Rain n/a 2.6, 2016
Maximum 10-min Rain n/a 1.3, 2016
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 1.9 °C 23:50 -0.2 °C 4.1 °C, 2022 -7.3 °C, 2013
Maximum Dew Point 6.5 °C 12:05 5.2 °C 10.8 °C, 2018 -3.8 °C, 2013
Mean Dew Point 4.6 °C 2.6 °C 6.3 °C, 2022 -5.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.2 °C 05:30 3.6 °C 7.0 °C, 2010 -1.3 °C, 2013
Day Maximum (09-21) 14.0 °C 15:10 10.9 °C 18.2 °C, 2012 3.4 °C, 2013
Max 10m Temp Rise n/a 11:22 0.5 °C 1, 2012 0.4, 2013
Max 1hr Temp Rise n/a 11:48 1.9 °C 3.5, 2012 1.1, 2010
Max 1hr Hum Rise 5% 22:55 6% 17%, 2014 5%, 2011
Max 10m Temp Fall 0.4 °C 20:30 0.3 °C 1.4 °C, 2016 0.2 °C, 2013
Max 1hr Temp Fall 1.2 °C 20:30 1.2 °C 3.6 °C, 2024 0.7 °C, 2013
Max 1hr Hum Fall 11% 12:00 9% 16%, 2014 6%, 2022
Max 10m Wind Speed 8.0 mph 00:03 8.2 mph 17.1 mph, 2024 4.7 mph, 2019
Minimum Feels-like 2.5 °C 07:20 0.4 °C 4.2 °C, 2010 -6.3 °C, 2013
Maximum Feels-like 14.0 °C 15:39 10.8 °C 18.2 °C, 2012 2.7 °C, 2013
Mean Feels-like 8.3 °C 5.7 °C 11.0 °C, 2012 -2.7 °C, 2013
Air-frost Hrs 0 hrs 0.4 hrs 6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.8 °C (+0.7) 7.9 °C (+1.4) 13.5 °C (+6.4), 2012 4.3 °C (-2.8), 2016
Humidity Range 33% 30% 52%, 2014 19%, 2022
Pressure Range 2 hPa 5 hPa 11 hPa, 2018 1 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [62%]115 hrs (118%) [40%] 11.4 [101%], 2012 1 [9%], 2010
Wet Hours 07.2 hrs (16%) [1.1%] 6, 2018 , 2009
Cloud Cover am: Overcast transitioned to Hazy
pm: Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th March 2011.
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