Daily Report for 16th July 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.8 °C (+0.4) 05:29 15.0 °C (+1.1) 18.2 °C (+3.8), 2017 10.4 °C (-4.0), 2021
Maximum Temperature 29.5 °C (+6.3) 15:04 27.5 °C (+4.7) 30.2 °C (+7.0), 2013 17.0 °C (-6.2), 2012
Mean Temperature 23.2 °C (+3.4) 21.5 °C (+2.9) 23.7 °C, 2013 15.2 °C, 2012
Minimum Humidity 30% 14:35 38% 70%, 2011 30%, 2018
Maximum Humidity 79% 05:45 85% 95%, 2009 75%, 2013
Mean Humidity 52% 61% 83%, 2012 50%, 2013
Minimum Pressure 1012 hPa 18:01 1018 hPa 1027 hPa, 2021 995 hPa, 2011
Maximum Pressure 1016 hPa 01:22 1022 hPa 1030 hPa, 2021 1012 hPa, 2011
Mean Pressure 1014 hPa 1020 hPa 1028 hPa, 2021 1004 hPa, 2011
Mean Wind Speed 3.3 mph (-1.0) 3.1 mph (-1.2) 9.2 mph, 2023 1.0 mph, 2022
Maximum Wind Speed 12.3 mph 21:08 10.6 mph 18.8 mph, 2023 8.7 mph, 2013
Maximum Gust 18.4 mph 17:56 16.0 mph 30.0 mph, 2023 10.9 mph, 2013
Mean Wind Direction W
Rainfall 0.0 mm 18.4 mm (78%) 13.7 mm, 2011
Maximum Hourly Rain n/a 5.5, 2009
Maximum 10-min Rain n/a 3, 2011
Maximum Rain Rate n/a 60, 2011
Minimum Dew Point 9.8 °C 13:49 10.3 °C 14.6 °C, 2016 7.2 °C, 2012
Maximum Dew Point 15.2 °C 21:53 15.4 °C 17.5 °C, 2016 13.4 °C, 2010
Mean Dew Point 12.1 °C 12.8 °C 15.8 °C, 2017 11.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.8 °C 05:29 15.0 °C 18.2 °C, 2017 10.4 °C, 2021
Day Maximum (09-21) 29.5 °C 15:06 27.5 °C 30.2 °C, 2013 17.0 °C, 2012
Max 10m Temp Rise 0.8 °C 06:17 0.7 °C 0.9 °C, 2014 0.3 °C, 2012
Max 1hr Temp Rise 2.9 °C 07:42 2.7 °C 3.6 °C, 2014 1.1 °C, 2012
Max 1hr Hum Rise 22% 21:44 14% 22%, 2009 4%, 2017
Max 10m Temp Fall 0.7 °C 21:21 0.6 °C 0.9 °C, 2023 0.3 °C, 2012
Max 1hr Temp Fall 2.6 °C 21:57 2.3 °C 3.4 °C, 2009 0.8 °C, 2012
Max 1hr Hum Fall 11% 06:59 12% 17%, 2014 6%, 2017
Max 10m Wind Speed 8.5 mph 23:21 7.9 mph 14.3 mph, 2023 2.8 mph, 2009
Minimum Feels-like 16.5 °C 05:12 17.3 °C 21.7 °C, 2017 11.3 °C, 2021
Maximum Feels-like 31.4 °C 15:14 30.5 °C 32.4 °C, 2013 21.2 °C, 2012
Mean Feels-like 25.6 °C 24.3 °C 26.1 °C, 2017 17.7 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.7 °C (+5.9) 12.5 °C (+3.5) 15.5 °C (+6.7), 2021 3.8 °C (-5.0), 2012
Humidity Range 49% 47% 51%, 2014 21%, 2017
Pressure Range 3 hPa 4 hPa 17 hPa, 2011 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [68%]167 hrs (163%) [70%] 14 [95%], 2021 0 [0%], 2012
Wet Hours 04.5 hrs (26%) [1.2%] 6, 2011 0, 2013
Cloud Cover am: Sunny
pm: Partly Cloudy
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 16th July 2018.
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

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Webcam Summary of Cloud Conditions

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