Daily Report for 4th May 2020

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+0.2) 23:58 7.4 °C (-0.1) 11.8 °C (+4.2), 2015 2.8 °C (-4.8), 2010
Maximum Temperature 16.6 °C (+0.1) 14:48 15.9 °C (-0.6) 20.2 °C (+3.7), 2018 8.9 °C (-7.6), 2012
Mean Temperature 12.6 °C (+0.1) 11.7 °C (-0.3) 15.3 °C, 2018 7.0 °C, 2019
Minimum Humidity 55% 14:52 51% 80%, 2012 33%, 2016
Maximum Humidity 85% 06:21 88% 96%, 2012 73%, 2013
Mean Humidity 70% 72% 89%, 2012 50%, 2016
Minimum Pressure 1018 hPa 00:01 1009 hPa 1025 hPa, 2010 992 hPa, 2015
Maximum Pressure 1024 hPa 21:53 1016 hPa 1028 hPa, 2009 1005 hPa, 2015
Mean Pressure 1021 hPa 1012 hPa 1026 hPa, 2010 1001 hPa, 2021
Mean Wind Speed 4.9 mph (+0.2) 4.3 mph (-0.4) 10.9 mph, 2021 2.5 mph, 2018
Maximum Wind Speed 14.1 mph 18:01 12.3 mph 25.2 mph, 2021 8.7 mph, 2012
Maximum Gust 19.6 mph 15:55 17.6 mph 35.4 mph, 2021 10.9 mph, 2014
Mean Wind Direction E
Rainfall 0.0 mm 5.3 mm (89%) 4.5 mm, 2015
Maximum Hourly Rain n/a 2.6, 2015
Maximum 10-min Rain n/a 1.2, 2022
Maximum Rain Rate n/a 13, 2019
Minimum Dew Point 4.0 °C 20:54 4.3 °C 7.5 °C, 2022 -3.9 °C, 2016
Maximum Dew Point 9.6 °C 15:20 8.7 °C 13.3 °C, 2023 3.4 °C, 2010
Mean Dew Point 7.2 °C 6.5 °C 9.8 °C, 2022 1.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.6 °C * 06:13 7.9 °C 11.8 °C, 2015 2.8 °C, 2010
Day Maximum (09-21) 16.6 °C 14:48 15.9 °C 20.2 °C, 2018 8.9 °C, 2012
Max 10m Temp Rise 0.7 °C 12:21 0.7 °C 1.0 °C, 2016 0.4 °C, 2010
Max 1hr Temp Rise 1.9 °C 08:20 2.3 °C 4.9 °C, 2016 1.0 °C, 2017
Max 1hr Hum Rise 9% 15:52 12% 24%, 2019 3%, 2012
Max 10m Temp Fall 0.7 °C 16:04 1.1 °C 2.4 °C, 2019 0.2 °C, 2012
Max 1hr Temp Fall 1.8 °C 20:17 2.3 °C 3.7 °C, 2019 0.5 °C, 2012
Max 1hr Hum Fall 12% 09:21 15% 26%, 2013 8%, 2010
Max 10m Wind Speed 11.4 mph 18:05 9.2 mph 17.9 mph, 2021 6.1 mph, 2012
Minimum Feels-like 4.2 °C 23:57 4.5 °C 12.0 °C, 2015 -0.3 °C, 2019
Maximum Feels-like 17.2 °C 15:52 16.2 °C 21.9 °C, 2023 8.9 °C, 2012
Mean Feels-like 12.5 °C 11.2 °C 15.8 °C, 2018 4.6 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.8 °C (-0.2) 8.5 °C (-0.5) 14.4 °C (+5.4), 2016 2.2 °C (-6.8), 2012
Humidity Range 30% 37% 51%, 2015 16%, 2012
Pressure Range 6 hPa 7 hPa 13 hPa, 2015 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8.5 [62%]25 hrs (109%) [47%] 13.5 [99%], 2011 0 [0%], 2012
Wet Hours 02 hrs (39%) [2.1%] 4, 2015 0, 2010
Cloud Cover am: Sunny transitioned to Partly Cloudy
pm: Mostly Sunny
Events None
Comments -
Extra Comments
Issues no pond temp due to covid
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 4th May 2020.
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose