Daily Report for 10th May 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.6 °C (+1.4) 07:06 7.6 °C (-0.2) 14.8 °C (+6.6), 2016 4.9 °C (-3.3), 2019
Maximum Temperature 17.8 °C (+0.7) 16:38 20.7 °C (+4.0) 23.6 °C (+6.5), 2024 12.8 °C (-4.3), 2010
Mean Temperature 13.5 °C (+1.0) 14.5 °C (+1.9) 17.7 °C, 2024 8.6 °C, 2010
Minimum Humidity 36% 17:32 40% 83%, 2012 33%, 2011
Maximum Humidity 89% 05:55 89% 97%, 2012 78%, 2017
Mean Humidity 61% 63% 92%, 2012 55%, 2011
Minimum Pressure 1009 hPa 00:58 1013 hPa 1024 hPa, 2024 997 hPa, 2021
Maximum Pressure 1021 hPa 23:59 1020 hPa 1026 hPa, 2024 1008 hPa, 2021
Mean Pressure 1015 hPa 1017 hPa 1025 hPa, 2024 1002 hPa, 2021
Mean Wind Speed 4.6 mph (-0.1) 4.2 mph (-0.5) 9.0 mph, 2014 2.1 mph, 2017
Maximum Wind Speed 13.5 mph 11:45 12.6 mph 22.5 mph, 2021 8.2 mph, 2017
Maximum Gust 19.6 mph 10:58 19.1 mph 36.9 mph, 2020 11.5 mph, 2017
Mean Wind Direction WNW
Rainfall 2.2 mm 6.8 mm (46%) 9.8 mm, 2012
Maximum Hourly Rain 1.5 mm 05:33 4.9 mm, 2012
Maximum 10-min Rain 1.1 mm 05:29 2.6 mm, 2012
Maximum Rain Rate 13 mm/h 05:28 24 mm/h, 2014
Minimum Dew Point 1.6 °C 17:32 4.2 °C 12.6 °C, 2012 -0.6 °C, 2010
Maximum Dew Point 9.3 °C 05:21 9.8 °C 15.1 °C, 2024 4.1 °C, 2010
Mean Dew Point 5.6 °C 6.8 °C 14.1 °C, 2012 2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.6 °C 07:05 7.9 °C 14.8 °C, 2016 4.9 °C, 2019
Day Maximum (09-21) 17.8 °C 16:38 20.7 °C 23.6 °C, 2024 12.8 °C, 2010
Max 10m Temp Rise 0.5 °C 16:05 0.9 °C 1.0 °C, 2011 0.2 °C, 2012
Max 1hr Temp Rise 2.0 °C 08:45 3.4 °C 5.0 °C, 2011 0.6 °C, 2016
Max 1hr Hum Rise 9% 21:59 11% 26%, 2014 4%, 2016
Max 10m Temp Fall 0.5 °C 21:09 0.8 °C 0.9 °C, 2014 0.2 °C, 2016
Max 1hr Temp Fall 1.5 °C 21:59 2.2 °C 2.9 °C, 2014 0.6 °C, 2016
Max 1hr Hum Fall 14% 11:45 18% 29%, 2014 1%, 2016
Max 10m Wind Speed 9.6 mph 11:26 9.7 mph 17.9 mph, 2021 5.9 mph, 2017
Minimum Feels-like 6.5 °C 06:39 6.4 °C 17.6 °C, 2016 1.0 °C, 2020
Maximum Feels-like 17.8 °C 16:37 21.6 °C 27.3 °C, 2024 12.8 °C, 2010
Mean Feels-like 13.5 °C 14.5 °C 20.0 °C, 2024 7.3 °C, 2010
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 (-0.7) 13.1 °C (+4.2) 14.5 °C (+5.6), 2009 1.9 °C (-7.0), 2016
Humidity Range 53% 50% 53%, 2018 13%, 2016
Pressure Range 12 hPa 7 hPa 14 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [50%]98 hrs (166%) [71%] 14 [101%], 2024 0 [0%], 2012
Wet Hours 2.5
[Mean rain rate: 0.9 mm/h]		8.5 hrs (66%) [3.5%] 9, 2016 0, 2009
Cloud Cover Partly Cloudy or Mostly Sunny
Events None
Comments o.night Rain/Showers
Extra Comments
Issues some data glitches ~21. corrected
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 10th May 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose