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Daily Report for 12th July 2021

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature13.9 °C (-0.2)06:0714.0 °C (+0.4)18.2 °C (+4.1), 20228.9 °C (-5.2), 2020
Maximum Temperature21.8 °C (-1.3)14:4121.3 °C (-1.4)30.5 °C (+7.4), 202218.6 °C (-4.5), 2024
Mean Temperature16.5 °C (-0.8)17.4 °C (-0.5)24.9 °C, 202214.5 °C, 2012
Minimum Humidity69%14:3864%69%, 202131%, 2026
Maximum Humidity94%22:5392%97%, 200974%, 2010
Mean Humidity88%79%88%, 202159%, 2010
Minimum Pressure1011 hPa15:371011 hPa1027 hPa, 20201005 hPa, 2012
Maximum Pressure1015 hPa00:001017 hPa1030 hPa, 20201010 hPa, 2009
Mean Pressure1012 hPa1014 hPa1029 hPa, 20201008 hPa, 2009
Mean Wind Speed1.1 mph (-3.2)3.1 mph (-1.2)7.8 mph, 20261.1 mph, 2021
Maximum Wind Speed7.6 mph10:2210.8 mph17.3 mph, 20236.9 mph, 2013
Maximum Gust11.4 mph10:2215.5 mph25.3 mph, 202610.9 mph, 2013
Mean Wind Directionn/aSWNNW, 2014NNE, 2011
Rainfall42.0 mm60.0 mm (337%)42.0 mm, 20210.0 mm, 2011
Maximum Hourly Rain20.0 mm17:382.2 mm20.0 mm, 20211.1 mm, 2009
Maximum 10-min Rain6.0 mm16:000.8 mm6.0 mm, 20160.5 mm, 2024
Maximum Rain Rate100 mm/h15:5511 mm/h126 mm/h, 20162.4 mm/h, 2024
Minimum Dew Point12.6 °C07:5611.7 °C13.4 °C, 20226.5 °C, 2012
Maximum Dew Point16.8 °C14:2615.5 °C18.4 °C, 202211.7 °C, 2020
Mean Dew Point14.5 °C13.7 °C16.0 °C, 20229.3 °C, 2020
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)13.9 °C06:0614.1 °C18.2 °C, 20228.9 °C, 2020
Day Maximum (09-21)21.8 °C14:4221.3 °C30.5 °C, 202218.6 °C, 2024
Max 10m Temp Rise0.7 °C12:040.6 °C1.0 °C, 20140.4 °C, 2011
Max 1hr Temp Rise2.4 °C12:382.2 °C4.2 °C, 20221.7 °C, 2016
Max 1hr Hum Rise15%16:4010%21%, 20126%, 2024
Max 10m Temp Fall0.8 °C16:290.6 °C0.9 °C, 20160.4 °C, 2010
Max 1hr Temp Fall3.3 °C16:562.0 °C3.3 °C, 20201.3 °C, 2023
Max 1hr Hum Fall11%12:4210%15%, 20147%, 2016
Max 10m Wind Speed5.0 mph10:277.8 mph12.5 mph, 20235.0 mph, 2021
Minimum Feels-like16.6 °C06:5216.4 °C21.4 °C, 20229.0 °C, 2020
Maximum Feels-like26.7 °C14:2625.3 °C36.2 °C, 202219.7 °C, 2012
Mean Feels-like20.2 °C20.6 °C29.6 °C, 202215.7 °C, 2012
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m32.5 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m313.6 µg/m3, 202613.6 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m37.4 µg/m3, 20267.4 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range7.9 °C (-1.1)7.3 °C15.7 °C, 20204.5 °C, 2011
Humidity Range25%28%59%, 202021%, 2011
Pressure Range4 hPa6 hPa17 hPa, 20172 hPa, 2024
ObservationDetail
Sun Hours1 hrs [7%]
Wet Hours8 hrs
Cloud Coveram: Mostly Cloudy
pm: Overcast
EventsThunder
CommentsT rn w thunder
Observer Absent?Yes - observations may be unreliable
Pond Temperature20.5 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 12th 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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