Daily Report for 4th May 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.2 °C (+1.7) 05:08 7.9 °C (+0.5) 11.8 °C (+4.4), 2015 2.8 °C (-4.7), 2010
Maximum Temperature 13.3 °C (-3.1) 12:38 13.6 °C (-2.8) 20.2 °C (+3.8), 2018 8.9 °C (-7.5), 2012
Mean Temperature 10.8 °C (-0.7) 10.6 °C (-1.1) 15.3 °C, 2018 7.0 °C, 2019
Minimum Humidity 62% 13:06 61% 80%, 2012 33%, 2016
Maximum Humidity 87% 07:23 85% 96%, 2012 73%, 2013
Mean Humidity 75% 75% 89%, 2012 50%, 2016
Minimum Pressure 1022 hPa 10:02 1014 hPa 1025 hPa, 2010 992 hPa, 2015
Maximum Pressure 1025 hPa 22:35 1022 hPa 1028 hPa, 2009 1005 hPa, 2015
Mean Pressure 1023 hPa 1017 hPa 1026 hPa, 2010 1001 hPa, 2021
Mean Wind Speed 6.3 mph (+1.6) 5.0 mph (+0.2) 10.9 mph, 2021 2.5 mph, 2018
Maximum Wind Speed 11.7 mph 10:24 11.4 mph 25.2 mph, 2021 8.7 mph, 2012
Maximum Gust 19.9 mph 12:57 18.6 mph 35.4 mph, 2021 10.9 mph, 2014
Mean Wind Direction NE
Rainfall 0.0 mm 7.4 mm (125%) 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 4.6 °C 22:33 4.2 °C 7.5 °C, 2022 -3.9 °C, 2016
Maximum Dew Point 8.2 °C 10:34 8.4 °C 13.3 °C, 2023 3.4 °C, 2010
Mean Dew Point 6.5 °C 6.1 °C 9.8 °C, 2022 1.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.2 °C 05:08 8.1 °C 11.8 °C, 2015 2.8 °C, 2010
Day Maximum (09-21) 13.3 °C 12:38 13.6 °C 20.2 °C, 2018 8.9 °C, 2012
Max 10m Temp Rise 0.4 °C 12:22 0.6 °C 1.0 °C, 2016 0.4 °C, 2010
Max 1hr Temp Rise 1.0 °C 12:30 1.6 °C 4.9 °C, 2016 1.0 °C, 2017
Max 1hr Hum Rise 6% 20:26 8% 24%, 2019 3%, 2012
Max 10m Temp Fall 0.3 °C 13:28 0.3 °C 2.4 °C, 2019 0.2 °C, 2012
Max 1hr Temp Fall 1.0 °C 19:06 1.0 °C 3.7 °C, 2019 0.5 °C, 2012
Max 1hr Hum Fall 13% 12:03 11% 26%, 2013 8%, 2010
Max 10m Wind Speed 9.9 mph 11:27 8.8 mph 17.9 mph, 2021 6.1 mph, 2012
Minimum Feels-like 5.9 °C 05:34 5.1 °C 12.0 °C, 2015 -0.3 °C, 2019
Maximum Feels-like 13.3 °C 12:30 13.7 °C 21.9 °C, 2023 8.9 °C, 2012
Mean Feels-like 10.0 °C 9.8 °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 4.1 °C (-4.9) 5.7 °C (-3.3) 14.4 °C (+5.4), 2016 2.2 °C (-6.8), 2012
Humidity Range 25% 24% 51%, 2015 16%, 2012
Pressure Range 3 hPa 8 hPa 13 hPa, 2015 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]7.6 hrs (33%) [14%] 13.5 [100%], 2011 0 [0%], 2012
Wet Hours 05 hrs (97%) [5.2%] 4, 2015 0, 2010
Cloud Cover Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 4th 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