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Daily Report for 28th July 2021

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature13.7 °C (-1.0)23:5414.8 °C (+0.6)16.9 °C (+2.2), 201811.6 °C (-3.1), 2024
Maximum Temperature20.5 °C (-2.8)13:4623.7 °C (+0.7)29.5 °C (+6.2), 202619.1 °C (-4.2), 2015
Mean Temperature17.1 °C (-1.9)19.0 °C (+0.6)23.8 °C, 202616.1 °C, 2015
Minimum Humidity65%13:5161%65%, 202134%, 2012
Maximum Humidity90%14:4991%93%, 202468%, 2012
Mean Humidity83%78%83%, 202151%, 2012
Minimum Pressure1007 hPa03:391014 hPa1022 hPa, 20241002 hPa, 2013
Maximum Pressure1009 hPa23:541019 hPa1028 hPa, 20241008 hPa, 2013
Mean Pressure1008 hPa1017 hPa1026 hPa, 20241006 hPa, 2015
Mean Wind Speed6.0 mph (+1.7)2.8 mph (-1.5)10.0 mph, 20180.9 mph, 2024
Maximum Wind Speed16.2 mph13:5410.5 mph21.4 mph, 20186.7 mph, 2011
Maximum Gust22.8 mph13:5415.6 mph39.2 mph, 201810.0 mph, 2011
Mean Wind Directionn/aSSENNW, 2025NNE, 2011
Rainfall10.8 mm116.1 mm (279%)10.8 mm, 20210.0 mm, 2009
Maximum Hourly Rain7.7 mm14:372.3 mm7.7 mm, 20210.5 mm, 2015
Maximum 10-min Rain2.6 mm14:010.9 mm2.6 mm, 20210.4 mm, 2015
Maximum Rain Rate30 mm/h13:5610 mm/h30 mm/h, 20212.2 mm/h, 2015
Minimum Dew Point11.0 °C23:5412.5 °C14.5 °C, 20232.3 °C, 2012
Maximum Dew Point15.4 °C02:1517.0 °C17.7 °C, 202610.0 °C, 2012
Mean Dew Point14.1 °C14.9 °C16.3 °C, 20266.9 °C, 2012
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)16.9 °C06:0815.0 °C17.2 °C, 201811.6 °C, 2024
Day Maximum (09-21)20.5 °C13:4623.7 °C29.5 °C, 202619.1 °C, 2015
Max 10m Temp Rise0.8 °C12:000.6 °C1.1 °C, 20090.5 °C, 2011
Max 1hr Temp Rise2.1 °C09:472.2 °C4.3 °C, 20241.4 °C, 2015
Max 1hr Hum Rise25%14:5111%25%, 20216%, 2009
Max 10m Temp Fall2.2 °C14:010.7 °C2.2 °C, 20210.4 °C, 2009
Max 1hr Temp Fall4.7 °C14:402.2 °C4.7 °C, 20211.4 °C, 2016
Max 1hr Hum Fall13%19:3410%16%, 20187%, 2019
Max 10m Wind Speed12.5 mph17:137.5 mph18.6 mph, 20184.7 mph, 2024
Minimum Feels-like15.5 °C23:5017.6 °C20.1 °C, 202312.9 °C, 2024
Maximum Feels-like24.0 °C12:2128.7 °C34.8 °C, 202619.5 °C, 2015
Mean Feels-like20.6 °C23.0 °C28.6 °C, 202616.8 °C, 2015
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m33.3 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m314.0 µg/m3, 202614.0 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m36.5 µg/m3, 20266.5 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range6.8 °C (-1.8)8.9 °C15.0 °C, 20245.4 °C, 2015
Humidity Range25%30%48%, 201825%, 2021
Pressure Range2 hPa5 hPa11 hPa, 20202 hPa, 2011
ObservationDetail
Sun Hours2 hrs [14%]
Wet Hours3 hrs
Cloud CoverMostly Cloudy with periods of Partly Cloudy
EventsNone
CommentsH shs
Observer Absent?Yes - observations may be unreliable
Pond Temperature21.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 28th July 2021. Times of extremes use the midpoint of the longest continuous period at that value. Cumulative anomalies are relative to the expected value for the month-to-date. Sun and wet hours are derived from webcam/rainfall analysis and may be adjusted. Data should be viewed with appropriate caution.

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