Daily Report for 1st May 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.8 °C (+1.7) 23:59 8.8 °C (+1.6) 11.2 °C (+4.1), 2024 1.5 °C (-5.6), 2016
Maximum Temperature 12.7 °C (-3.4) 16:46 12.7 °C (-3.5) 28.7 °C (+12.6), 2025 12.3 °C (-3.8), 2021
Mean Temperature 10.8 °C (-0.8) 10.8 °C (-1.0) 19.8 °C, 2025 7.6 °C, 2021
Minimum Humidity 64% 13:19 64% 72%, 2014 26%, 2025
Maximum Humidity 81% 15:44 81% 97%, 2012 66%, 2011
Mean Humidity 74% 74% 90%, 2014 52%, 2011
Minimum Pressure 998 hPa 01:11 998 hPa 1026 hPa, 2016 997 hPa, 2020
Maximum Pressure 1014 hPa 23:25 1014 hPa 1029 hPa, 2016 1006 hPa, 2020
Mean Pressure 1004 hPa 1004 hPa 1027 hPa, 2016 1000 hPa, 2020
Mean Wind Speed 3.3 mph (-1.4) 3.3 mph (-1.4) 9.2 mph, 2011 1.6 mph, 2014
Maximum Wind Speed 10.3 mph 14:09 10.3 mph 18.5 mph, 2011 8.5 mph, 2014
Maximum Gust 17.8 mph 12:45 17.8 mph 27.3 mph, 2011 12.3 mph, 2014
Mean Wind Direction SE
Rainfall 4.9 mm 4.9 mm (330%) 31.7 mm, 2010
Maximum Hourly Rain 2.1 mm 01:18 13.1 mm, 2010
Maximum 10-min Rain 1.0 mm 00:51 4.1 mm, 2010
Maximum Rain Rate 10 mm/h 01:02 60 mm/h, 2010
Minimum Dew Point 4.5 °C 23:09 4.5 °C 10.3 °C, 2024 -2.7 °C, 2013
Maximum Dew Point 8.8 °C 15:44 8.8 °C 14.6 °C, 2024 2.8 °C, 2015
Mean Dew Point 6.2 °C 6.2 °C 12.3 °C, 2024 0.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.5 °C * 06:54 9.5 °C 11.2 °C, 2024 1.5 °C, 2016
Day Maximum (09-21) 12.7 °C 16:46 12.7 °C 28.7 °C, 2025 12.3 °C, 2021
Max 10m Temp Rise 0.6 °C 09:54 0.6 °C 1.6 °C, 2009 0.3 °C, 2014
Max 1hr Temp Rise 1.3 °C 16:20 1.3 °C 4.5 °C, 2016 0.7 °C, 2014
Max 1hr Hum Rise 12% 14:36 12% 18%, 2020 4%, 2014
Max 10m Temp Fall 0.5 °C 15:13 0.5 °C 2.4 °C, 2020 0.3 °C, 2014
Max 1hr Temp Fall 1.0 °C 01:05 1.0 °C 3.3 °C, 2020 0.7 °C, 2014
Max 1hr Hum Fall 9% 16:41 9% 22%, 2013 3%, 2014
Max 10m Wind Speed 7.3 mph 14:16 7.3 mph 13.0 mph, 2018 5.6 mph, 2025
Minimum Feels-like 6.7 °C 23:24 6.7 °C 12.6 °C, 2024 -0.9 °C, 2018
Maximum Feels-like 13.0 °C 16:42 13.0 °C 30.0 °C, 2025 12.3 °C, 2021
Mean Feels-like 10.7 °C 10.7 °C 21.1 °C, 2025 7.1 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-5.1) 3.9 °C (-5.1) 19.1 °C (+10.1), 2025 3.2 °C (-5.8), 2014
Humidity Range 17% 17% 62%, 2025 17%, 2017
Pressure Range 16 hPa 16 hPa 16 hPa, 2017 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.1 [16%]2.1 hrs (36%) [16%] 11 [82%], 2011 0 [0%], 2014
Wet Hours 4
[Mean rain rate: 1.2 mm/h]		4 hrs (310%) [17%] 13, 2014 0, 2009
Cloud Cover Partly Cloudy with periods of Mostly Cloudy
Events None
Comments Showers
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 1st 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose