Daily Report for 3rd July 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.7 °C (+2.4) 05:29 14.9 °C (+1.5) 18.6 °C (+5.3), 2009 11.4 °C (-1.9), 2016
Maximum Temperature 24.4 °C (+2.0) 17:34 23.7 °C (+1.3) 26.3 °C (+3.9), 2014 19.0 °C (-3.4), 2012
Mean Temperature 19.5 °C (+2.2) 18.9 °C (+1.4) 21.0 °C, 2014 16.5 °C, 2020
Minimum Humidity 46% 18:25 44% 75%, 2012 28%, 2014
Maximum Humidity 72% 08:28 78% 96%, 2012 66%, 2011
Mean Humidity 59% 60% 89%, 2012 46%, 2014
Minimum Pressure 1019 hPa 00:02 1015 hPa 1027 hPa, 2019 1003 hPa, 2013
Maximum Pressure 1022 hPa 12:11 1021 hPa 1029 hPa, 2019 1013 hPa, 2023
Mean Pressure 1020 hPa 1018 hPa 1028 hPa, 2019 1008 hPa, 2013
Mean Wind Speed 4.0 mph (-0.3) 4.2 mph (-0.1) 8.7 mph, 2023 2.2 mph, 2022
Maximum Wind Speed 12.1 mph 13:57 11.0 mph 23.5 mph, 2020 7.4 mph, 2011
Maximum Gust 16.8 mph 13:07 17.1 mph 34.6 mph, 2023 9.8 mph, 2011
Mean Wind Direction W
Rainfall 0.0 mm 0.0 mm (0%) 2.8 mm, 2012
Maximum Hourly Rain n/a 1.2, 2012
Maximum 10-min Rain n/a 0.6, 2013
Maximum Rain Rate n/a 4.6, 2012
Minimum Dew Point 8.0 °C 03:53 7.5 °C 14.1 °C, 2012 4.3 °C, 2014
Maximum Dew Point 13.8 °C 16:04 13.1 °C 17.6 °C, 2009 10.2 °C, 2011
Mean Dew Point 11.1 °C 10.6 °C 15.1 °C, 2021 8.2 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 15.4 °C * 23:40 14.8 °C 18.6 °C, 2009 11.4 °C, 2016
Day Maximum (09-21) 24.4 °C 17:34 23.7 °C 26.3 °C, 2014 19.0 °C, 2012
Max 10m Temp Rise 0.6 °C 00:10 0.7 °C 0.9 °C, 2018 0.4 °C, 2012
Max 1hr Temp Rise 2.2 °C 16:30 2.2 °C 3.1 °C, 2018 1.1 °C, 2012
Max 1hr Hum Rise 6% 23:22 7% 18%, 2023 5%, 2009
Max 10m Temp Fall 0.5 °C 19:40 0.5 °C 1.0 °C, 2023 0.3 °C, 2012
Max 1hr Temp Fall 1.5 °C 21:44 2.0 °C 3.0 °C, 2023 0.9 °C, 2012
Max 1hr Hum Fall 8% 16:18 10% 14%, 2015 8%, 2012
Max 10m Wind Speed 8.9 mph 17:27 8.3 mph 15.8 mph, 2023 6.2 mph, 2011
Minimum Feels-like 16.2 °C 03:50 15.7 °C 19.7 °C, 2021 11.7 °C, 2016
Maximum Feels-like 27.1 °C 16:30 25.8 °C 27.7 °C, 2015 22.1 °C, 2016
Mean Feels-like 21.4 °C 20.5 °C 22.6 °C, 2021 17.6 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.7 °C (-0.4) 8.9 °C (-0.2) 13.7 °C (+4.6), 2015 3.6 °C (-5.5), 2012
Humidity Range 26% 34% 51%, 2009 20%, 2021
Pressure Range 3 hPa 6 hPa 13 hPa, 2013 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.5 [30%]22 hrs (111%) [48%] 15.1 [100%], 2018 0 [0%], 2012
Wet Hours 00 hrs (0%) [0%] 7, 2012 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Mostly Cloudy transitioned to Mostly Sunny
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 3rd July 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