Daily Report for 17th May 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.2 °C (+3.1) 23:55 9.0 °C (+0.8) 12.2 °C (+3.1), 2017 5.7 °C (-3.4), 2010
Maximum Temperature 18.6 °C (+0.8) 14:30 16.8 °C (-0.3) 25.9 °C (+8.0), 2022 11.6 °C (-6.3), 2013
Mean Temperature 15.9 °C (+1.9) 12.7 °C (+0.2) 19.4 °C, 2022 9.7 °C, 2013
Minimum Humidity 78% 00:14 55% 78%, 2017 37%, 2015
Maximum Humidity 89% 08:44 82% 96%, 2024 76%, 2015
Mean Humidity 86% 70% 87%, 2021 54%, 2015
Minimum Pressure 1013 hPa 00:02 1012 hPa 1028 hPa, 2023 998 hPa, 2021
Maximum Pressure 1024 hPa 01:13 1020 hPa 1030 hPa, 2023 1010 hPa, 2009
Mean Pressure 1019 hPa 1016 hPa 1029 hPa, 2023 1006 hPa, 2013
Mean Wind Speed 2.0 mph (-2.7) 4.6 mph (-0.1) 9.6 mph, 2009 1.2 mph, 2014
Maximum Wind Speed 9.5 mph 14:51 11.8 mph 14.1 mph, 2021 6.4 mph, 2014
Maximum Gust 13.6 mph 14:51 18.3 mph 33.0 mph, 2009 8.7 mph, 2014
Mean Wind Direction WSW
Rainfall 35.6 mm 48.3 mm (191%) 35.6 mm, 2017
Maximum Hourly Rain 6.9 mm 04:39 6.9 mm, 2017
Maximum 10-min Rain 2.0 mm 02:13 2.4 mm, 2021
Maximum Rain Rate 20 mm/h 02:05 33 mm/h, 2009
Minimum Dew Point 10.1 °C 23:55 4.6 °C 10.1 °C, 2017 0.6 °C, 2012
Maximum Dew Point 16.2 °C 14:10 9.4 °C 16.2 °C, 2017 5.5 °C, 2012
Mean Dew Point 13.6 °C 7.1 °C 13.6 °C, 2017 3.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 16.0 °C * 05:38 9.4 °C 16.0 °C, 2017 5.7 °C, 2010
Day Maximum (09-21) 18.6 °C 14:30 16.8 °C 25.9 °C, 2022 11.6 °C, 2013
Max 10m Temp Rise 0.5 °C 13:54 0.6 °C 5.6 °C, 2024 0.4 °C, 2019
Max 1hr Temp Rise 1.6 °C 14:06 1.9 °C 8.4 °C, 2024 1.2 °C, 2019
Max 1hr Hum Rise 4% 01:24 9% 22%, 2021 4%, 2017
Max 10m Temp Fall 0.6 °C 16:25 0.5 °C 2.5 °C, 2021 0.3 °C, 2019
Max 1hr Temp Fall 2.2 °C 16:28 1.6 °C 4.7 °C, 2021 0.9 °C, 2019
Max 1hr Hum Fall 4% 14:45 10% 31%, 2024 4%, 2017
Max 10m Wind Speed 6.9 mph 21:34 9.0 mph 11.3 mph, 2022 4.9 mph, 2014
Minimum Feels-like 13.5 °C 23:51 7.7 °C 13.5 °C, 2017 2.5 °C, 2018
Maximum Feels-like 23.3 °C 14:12 17.6 °C 30.1 °C, 2022 11.6 °C, 2013
Mean Feels-like 19.0 °C 12.9 °C 22.2 °C, 2022 9.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.4 °C (-2.3) 7.7 °C (-1.1) 15.5 °C (+6.8), 2022 5.5 °C (-3.2), 2013
Humidity Range 11% 27% 53%, 2020 11%, 2017
Pressure Range 11 hPa 8 hPa 14 hPa, 2012 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]60 hrs (59%) [25%] 13 [91%], 2018 0 [0%], 2017
Wet Hours 14
[Mean rain rate: 2.5 mm/h]
26 hrs (119%) [6.4%] 14, 2017 0, 2010
Cloud Cover Overcast
Events None
Comments Rain, lots
Extra Comments
Issues Rn data from N16
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th 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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose