Daily Report for 10th May 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (-0.4) 03:28 8.8 °C (+1.0) 14.8 °C (+6.6), 2016 4.9 °C (-3.3), 2019
Maximum Temperature 19.0 °C (+1.9) 15:34 16.6 °C (-0.1) 23.6 °C (+6.5), 2024 12.8 °C (-4.3), 2010
Mean Temperature 14.4 °C (+0.7) 12.6 °C (+0.4) 17.7 °C, 2024 8.6 °C, 2010
Minimum Humidity 48% 15:19 45% 83%, 2012 30%, 2025
Maximum Humidity 86% 06:17 88% 97%, 2012 78%, 2017
Mean Humidity 63% 67% 92%, 2012 53%, 2025
Minimum Pressure 1020 hPa 22:00 1004 hPa 1024 hPa, 2024 997 hPa, 2021
Maximum Pressure 1024 hPa 07:57 1012 hPa 1026 hPa, 2024 1008 hPa, 2021
Mean Pressure 1023 hPa 1008 hPa 1025 hPa, 2024 1002 hPa, 2021
Mean Wind Speed 5.0 mph (+0.3) 7.5 mph (+2.8) 9.0 mph, 2014 2.1 mph, 2017
Maximum Wind Speed 13.0 mph 00:00 17.4 mph 22.5 mph, 2021 8.2 mph, 2017
Maximum Gust 19.0 mph 00:00 26.8 mph 36.9 mph, 2020 11.5 mph, 2017
Mean Wind Direction SSW
Rainfall 0.0 mm 23.8 mm (160%) 9.8 mm, 2012
Maximum Hourly Rain n/a 4.9, 2012
Maximum 10-min Rain n/a 2.6, 2012
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point 2.7 °C 00:08 2.7 °C 12.6 °C, 2012 -0.6 °C, 2010
Maximum Dew Point 9.5 °C 10:09 9.9 °C 15.1 °C, 2024 4.1 °C, 2010
Mean Dew Point 7.2 °C 6.3 °C 14.1 °C, 2012 2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.8 °C 03:28 8.8 °C 14.8 °C, 2016 4.9 °C, 2019
Day Maximum (09-21) 19.0 °C 15:34 16.6 °C 23.6 °C, 2024 12.8 °C, 2010
Max 10m Temp Rise 0.6 °C 10:02 0.6 °C 1.0 °C, 2011 0.2 °C, 2012
Max 1hr Temp Rise 2.1 °C 10:17 2.0 °C 5.0 °C, 2011 0.6 °C, 2016
Max 1hr Hum Rise 8% 04:39 9% 26%, 2014 4%, 2016
Max 10m Temp Fall 0.3 °C 01:56 0.5 °C 0.9 °C, 2014 0.2 °C, 2016
Max 1hr Temp Fall 1.2 °C 19:59 1.3 °C 2.9 °C, 2014 0.6 °C, 2016
Max 1hr Hum Fall 10% 10:23 14% 29%, 2014 1%, 2016
Max 10m Wind Speed 10.0 mph 00:10 13.5 mph 17.9 mph, 2021 5.9 mph, 2017
Minimum Feels-like 3.2 °C 03:26 6.3 °C 17.6 °C, 2016 1.0 °C, 2020
Maximum Feels-like 19.4 °C 15:29 17.1 °C 27.3 °C, 2024 12.8 °C, 2010
Mean Feels-like 14.0 °C 12.5 °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 11.2 °C (+2.3) 7.8 °C (-1.1) 14.5 °C (+5.6), 2009 1.9 °C (-7.0), 2016
Humidity Range 38% 42% 55%, 2025 13%, 2016
Pressure Range 4 hPa 9 hPa 14 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [58%]39 hrs (66%) [28%] 14 [101%], 2024 0 [0%], 2012
Wet Hours 018 hrs (136%) [7.3%] 9, 2016 0, 2009
Cloud Cover am: Overcast transitioned to Mostly Sunny
pm: Sunny
Events None
Comments -
Extra Comments
Issues wind sensor out of battery; data reconstructed
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 10th May 2015.
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