Daily Report for 4th May 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.0 °C (-3.6) 06:00 5.0 °C (-2.5) 11.8 °C (+4.2), 2015 2.8 °C (-4.8), 2010
Maximum Temperature 18.4 °C (+1.9) 14:33 16.9 °C (+0.4) 20.2 °C (+3.7), 2018 8.9 °C (-7.6), 2012
Mean Temperature 12.8 °C (-0.9) 11.5 °C (-1.0) 15.3 °C, 2018 7.0 °C, 2019
Minimum Humidity 33% 18:13 38% 80%, 2012 33%, 2016
Maximum Humidity 80% 06:52 83% 96%, 2012 73%, 2013
Mean Humidity 50% 59% 89%, 2012 50%, 2016
Minimum Pressure 1024 hPa 20:05 1022 hPa 1025 hPa, 2010 992 hPa, 2015
Maximum Pressure 1028 hPa 04:00 1028 hPa 1028 hPa, 2009 1005 hPa, 2015
Mean Pressure 1026 hPa 1024 hPa 1026 hPa, 2010 1001 hPa, 2021
Mean Wind Speed 3.0 mph (-1.7) 4.7 mph (-0.0) 10.9 mph, 2021 2.5 mph, 2018
Maximum Wind Speed 11.7 mph 15:18 13.2 mph 25.2 mph, 2021 8.7 mph, 2012
Maximum Gust 17.8 mph 15:19 18.9 mph 35.4 mph, 2021 10.9 mph, 2014
Mean Wind Direction SSW
Rainfall 0.0 mm 0.2 mm (3%) 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 -3.9 °C 23:57 -0.6 °C 7.5 °C, 2022 -3.9 °C, 2016
Maximum Dew Point 6.2 °C 08:16 6.8 °C 13.3 °C, 2023 3.4 °C, 2010
Mean Dew Point 1.6 °C 3.1 °C 9.8 °C, 2022 1.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.0 °C 06:00 5.3 °C 11.8 °C, 2015 2.8 °C, 2010
Day Maximum (09-21) 18.4 °C 14:33 16.9 °C 20.2 °C, 2018 8.9 °C, 2012
Max 10m Temp Rise 1.0 °C 07:25 0.8 °C 1.0 °C, 2016 0.4 °C, 2010
Max 1hr Temp Rise 4.9 °C 07:59 3.4 °C 4.9 °C, 2016 1.0 °C, 2017
Max 1hr Hum Rise 4% 01:39 8% 24%, 2019 3%, 2012
Max 10m Temp Fall 0.4 °C 01:26 0.6 °C 2.4 °C, 2019 0.2 °C, 2012
Max 1hr Temp Fall 1.8 °C 20:42 2.0 °C 3.7 °C, 2019 0.5 °C, 2012
Max 1hr Hum Fall 18% 09:19 14% 26%, 2013 8%, 2010
Max 10m Wind Speed 7.9 mph 13:33 10.1 mph 17.9 mph, 2021 6.1 mph, 2012
Minimum Feels-like 4.0 °C 05:52 3.7 °C 12.0 °C, 2015 -0.3 °C, 2019
Maximum Feels-like 18.4 °C 14:06 17.1 °C 21.9 °C, 2023 8.9 °C, 2012
Mean Feels-like 12.8 °C 11.5 °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 14.4 °C (+5.4) 11.9 °C (+2.9) 14.4 °C (+5.4), 2016 2.2 °C (-6.8), 2012
Humidity Range 47% 45% 51%, 2015 16%, 2012
Pressure Range 4 hPa 6 hPa 13 hPa, 2015 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13.5 [99%]35 hrs (151%) [65%] 13.5 [99%], 2011 0 [0%], 2012
Wet Hours 01 hrs (19%) [1%] 4, 2015 0, 2010
Cloud Cover Sunny with periods of Mostly Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues Wind data from Harpenden
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 4th May 2016.
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