Daily Report for 16th May 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.6 °C (+2.6) 03:34 9.2 °C (+1.1) 15.7 °C (+6.7), 2017 2.9 °C (-6.1), 2013
Maximum Temperature 19.8 °C (+2.1) 15:53 18.6 °C (+1.5) 24.4 °C (+6.7), 2017 14.3 °C (-3.4), 2012
Mean Temperature 15.0 °C (+2.3) 14.2 °C (+1.3) 19.2 °C, 2017 9.9 °C, 2012
Minimum Humidity 45% 16:15 39% 76%, 2024 35%, 2019
Maximum Humidity 81% 06:30 78% 96%, 2024 79%, 2020
Mean Humidity 64% 57% 87%, 2024 60%, 2012
Minimum Pressure 1021 hPa 19:04 1016 hPa 1028 hPa, 2014 996 hPa, 2021
Maximum Pressure 1024 hPa 00:49 1020 hPa 1036 hPa, 2014 1001 hPa, 2013
Mean Pressure 1022 hPa 1018 hPa 1032 hPa, 2014 999 hPa, 2021
Mean Wind Speed 7.1 mph (+2.4) 6.0 mph (+1.2) 7.5 mph, 2009 0.8 mph, 2014
Maximum Wind Speed 15.4 mph 14.3 mph 17.2 mph, 2019 7.6 mph, 2014
Maximum Gust 19.7 mph 10:24 20.8 mph 30.0 mph, 2009 8.5 mph, 2014
Mean Wind Direction WSW
Rainfall 0.0 mm 4.1 mm (17%) 8.8 mm, 2010
Maximum Hourly Rain n/a 6.3, 2010
Maximum 10-min Rain n/a 2.7, 2010
Maximum Rain Rate n/a 60, 2010
Minimum Dew Point 5.9 °C 21:54 2.1 °C 11.9 °C, 2017 -0.6 °C, 2012
Maximum Dew Point 9.9 °C 09:47 8.5 °C 15.9 °C, 2017 4.1 °C, 2012
Mean Dew Point 8.0 °C 5.3 °C 13.5 °C, 2017 1.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.6 °C 03:35 9.4 °C 15.7 °C, 2017 2.9 °C, 2013
Day Maximum (09-21) 19.8 °C 15:50 18.6 °C 24.4 °C, 2017 14.3 °C, 2012
Max 10m Temp Rise 0.4 °C 14:38 0.7 °C 1.1 °C, 2013 0.4 °C, 2011
Max 1hr Temp Rise 1.7 °C 15:16 2.9 °C 5.2 °C, 2013 1.5 °C, 2016
Max 1hr Hum Rise 6% 23:17 8% 28%, 2009 4%, 2024
Max 10m Temp Fall 0.7 °C 18:07 0.5 °C 0.8 °C, 2020 0.4 °C, 2017
Max 1hr Temp Fall 2.3 °C 19:03 1.5 °C 3.2 °C, 2020 1.0 °C, 2024
Max 1hr Hum Fall 4% 15:24 9% 23%, 2009 4%, 2010
Max 10m Wind Speed 11.1 mph 18:48 10.1 mph 13.8 mph, 2022 4.1 mph, 2014
Minimum Feels-like 11.9 °C 02:35 8.1 °C 18.4 °C, 2017 0.8 °C, 2012
Maximum Feels-like 20.4 °C 17:10 18.9 °C 27.5 °C, 2017 14.3 °C, 2012
Mean Feels-like 15.5 °C 14.2 °C 22.3 °C, 2017 9.2 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.2 °C (-0.5) 9.4 °C (+0.5) 13.9 °C (+5.2), 2014 6.5 °C (-2.2), 2021
Humidity Range 36% 39% 56%, 2013 20%, 2024
Pressure Range 3 hPa 4 hPa 10 hPa, 2019 2 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [11%]124 hrs (130%) [56%] 12 [85%], 2019 0 [0%], 2024
Wet Hours 04 hrs (19%) [1%] 4, 2021 0, 2011
Cloud Cover am: Overcast
pm: Mostly Cloudy or Hazy
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 16th May 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