Daily Report for 30th May 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.0 °C (+4.2) 06:32 10.3 °C (+1.3) 15.0 °C (+4.2), 2017 5.2 °C (-5.6), 2022
Maximum Temperature 20.6 °C (+1.3) 18:35 19.1 °C (+1.3) 25.4 °C (+6.1), 2012 15.1 °C (-4.2), 2013
Mean Temperature 17.9 °C (+2.8) 14.6 °C (+1.3) 19.2 °C, 2012 10.7 °C, 2022
Minimum Humidity 53% 18:42 53% 80%, 2018 30%, 2009
Maximum Humidity 85% 02:56 83% 97%, 2013 81%, 2015
Mean Humidity 70% 69% 90%, 2018 55%, 2015
Minimum Pressure 1012 hPa 05:26 1013 hPa 1030 hPa, 2023 1006 hPa, 2010
Maximum Pressure 1020 hPa 23:19 1021 hPa 1032 hPa, 2023 1013 hPa, 2011
Mean Pressure 1018 hPa 1017 hPa 1031 hPa, 2023 1010 hPa, 2011
Mean Wind Speed 4.6 mph (-0.1) 4.1 mph (-0.6) 8.1 mph, 2019 1.6 mph, 2018
Maximum Wind Speed 13.8 mph 14:31 11.2 mph 19.1 mph, 2019 7.0 mph, 2018
Maximum Gust 22.0 mph 14:43 17.2 mph 27.6 mph, 2019 12.7 mph, 2018
Mean Wind Direction W
Rainfall 0.0 mm 85.9 mm (193%) 5.1 mm, 2013
Maximum Hourly Rain n/a 2, 2013
Maximum 10-min Rain n/a 0.6, 2013
Maximum Rain Rate n/a 2.8, 2013
Minimum Dew Point 10.2 °C 18:51 6.1 °C 11.7 °C, 2018 1.2 °C, 2015
Maximum Dew Point 15.1 °C 00:08 11.0 °C 17.0 °C, 2018 6.3 °C, 2015
Mean Dew Point 12.2 °C 8.6 °C 13.9 °C, 2018 3.3 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.0 °C 06:32 10.6 °C 15.0 °C, 2017 5.2 °C, 2022
Day Maximum (09-21) 20.6 °C 18:35 19.1 °C 25.4 °C, 2012 15.1 °C, 2013
Max 10m Temp Rise 0.6 °C 10:32 0.6 °C 0.9 °C, 2009 0.4 °C, 2014
Max 1hr Temp Rise 1.6 °C 10:51 2.2 °C 3.5 °C, 2022 1.2 °C, 2016
Max 1hr Hum Rise 5% 20:26 9% 22%, 2012 4%, 2013
Max 10m Temp Fall 0.4 °C 18:49 0.5 °C 1.0 °C, 2012 0.2 °C, 2016
Max 1hr Temp Fall 1.0 °C 04:01 1.8 °C 3.2 °C, 2012 0.9 °C, 2016
Max 1hr Hum Fall 8% 10:57 10% 20%, 2012 6%, 2023
Max 10m Wind Speed 10.2 mph 15:23 8.5 mph 12.6 mph, 2019 4.9 mph, 2018
Minimum Feels-like 17.2 °C 06:25 9.8 °C 17.2 °C, 2017 2.2 °C, 2022
Maximum Feels-like 22.6 °C 15:07 20.6 °C 27.5 °C, 2019 15.8 °C, 2022
Mean Feels-like 20.3 °C 15.4 °C 22.1 °C, 2019 10.9 °C, 2022
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.6 °C (-2.9) 8.8 °C (+0.1) 14.3 °C (+5.8), 2020 4.4 °C (-4.1), 2013
Humidity Range 32% 30% 60%, 2009 15%, 2018
Pressure Range 8 hPa 8 hPa 10 hPa, 2010 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [14%]157 hrs (86%) [37%] 14.8 [100%], 2020 0 [0%], 2014
Wet Hours 044 hrs (114%) [6.1%] 5, 2013 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Mostly Cloudy transitioned to Mostly 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 30th May 2017.
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.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose