Daily Report for 29th May 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.2 °C (+2.5) 23:57 9.0 °C (-0.0) 14.0 °C (+3.3), 2012 6.8 °C (-3.9), 2022
Maximum Temperature 17.0 °C (-2.2) 11:21 20.4 °C (+2.6) 24.1 °C (+4.9), 2025 12.5 °C (-6.7), 2013
Mean Temperature 14.7 °C (+0.2) 14.8 °C (+1.3) 18.7 °C, 2025 10.8 °C, 2013
Minimum Humidity 85% 11:06 48% 85%, 2018 28%, 2020
Maximum Humidity 96% 14:37 89% 97%, 2014 80%, 2011
Mean Humidity 92% 69% 92%, 2018 55%, 2020
Minimum Pressure 1014 hPa 22:03 1017 hPa 1029 hPa, 2009 1001 hPa, 2013
Maximum Pressure 1020 hPa 01:07 1022 hPa 1033 hPa, 2009 1008 hPa, 2013
Mean Pressure 1017 hPa 1019 hPa 1031 hPa, 2009 1004 hPa, 2013
Mean Wind Speed 4.9 mph (+0.2) 3.9 mph (-0.8) 8.6 mph, 2011 1.8 mph, 2021
Maximum Wind Speed 11.4 mph 15:49 11.4 mph 18.0 mph, 2025 8.5 mph, 2017
Maximum Gust 18.4 mph 08:49 18.4 mph 28.8 mph, 2025 10.9 mph, 2013
Mean Wind Direction NNE
Rainfall 16.3 mm 38.3 mm (89%) 16.3 mm, 2018
Maximum Hourly Rain 8.1 mm 14:26 8.1 mm, 2018
Maximum 10-min Rain 2.9 mm 13:55 4.0 mm, 2017
Maximum Rain Rate 26 mm/h 15:29 100 mm/h, 2017
Minimum Dew Point 12.0 °C 05:11 6.2 °C 12.0 °C, 2018 -0.8 °C, 2020
Maximum Dew Point 14.9 °C 14:42 11.6 °C 16.9 °C, 2017 8.0 °C, 2022
Mean Dew Point 13.4 °C 8.7 °C 14.6 °C, 2017 4.6 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.3 °C * 05:19 9.2 °C 14.0 °C, 2012 6.8 °C, 2022
Day Maximum (09-21) 17.0 °C 11:23 20.4 °C 24.1 °C, 2025 12.5 °C, 2013
Max 10m Temp Rise 0.3 °C 08:51 0.7 °C 0.9 °C, 2023 0.3 °C, 2018
Max 1hr Temp Rise 1.4 °C 10:47 2.8 °C 3.1 °C, 2022 1.4 °C, 2018
Max 1hr Hum Rise 5% 12:30 11% 22%, 2019 5%, 2011
Max 10m Temp Fall 0.4 °C 11:47 0.6 °C 0.7 °C, 2017 0.4 °C, 2013
Max 1hr Temp Fall 1.2 °C 12:24 2.1 °C 2.6 °C, 2019 0.8 °C, 2014
Max 1hr Hum Fall 4% 10:50 14% 18%, 2015 4%, 2018
Max 10m Wind Speed 9.0 mph 08:44 8.5 mph 13.9 mph, 2011 5.8 mph, 2012
Minimum Feels-like 15.6 °C 04:50 8.4 °C 16.1 °C, 2017 4.7 °C, 2022
Maximum Feels-like 20.8 °C 11:24 22.2 °C 28.3 °C, 2025 14.5 °C, 2013
Mean Feels-like 17.8 °C 15.7 °C 21.7 °C, 2025 11.4 °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 3.8 °C (-4.7) 11.4 °C (+2.7) 12.5 °C (+4.0), 2020 3.7 °C (-4.8), 2010
Humidity Range 11% 41% 56%, 2009 11%, 2018
Pressure Range 6 hPa 5 hPa 10 hPa, 2010 2 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]241 hrs (137%) [59%] 14.8 [101%], 2020 0 [0%], 2013
Wet Hours 4
[Mean rain rate: 4.1 mm/h]		28 hrs (76%) [4.1%] 4, 2010 0, 2009
Cloud Cover Overcast
Events Thunder
Comments brief am Showers; 13-16 Heavy Rain/Showers with Thunder
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 29th 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