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Daily Report for 4th August 2011

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature16.6 °C (+2.1)23:5516.0 °C (+1.5)18.9 °C (+4.4), 201810.9 °C (-3.6), 2020
Maximum Temperature20.2 °C (-3.0)19:3126.4 °C (+3.2)30.8 °C (+7.6), 202619.4 °C (-3.8), 2023
Mean Temperature18.2 °C (-0.5)21.1 °C (+2.3)23.6 °C, 202616.4 °C, 2010
Minimum Humidity58%00:0341%71%, 202336%, 2014
Maximum Humidity93%13:3580%96%, 202075%, 2014
Mean Humidity82%60%83%, 200954%, 2014
Minimum Pressure1007 hPa15:481012 hPa1022 hPa, 20181004 hPa, 2010
Maximum Pressure1014 hPa00:561014 hPa1026 hPa, 20181011 hPa, 2010
Mean Pressure1010 hPa1013 hPa1024 hPa, 20181008 hPa, 2010
Mean Wind Speed5.9 mph (+1.9)3.7 mph (-0.3)9.7 mph, 20161.2 mph, 2021
Maximum Wind Speed10.9 mph11.6 mph23.2 mph, 20166.4 mph, 2021
Maximum Gust16.8 mph04:4115.6 mph33.9 mph, 201611.4 mph, 2021
Mean Wind Directionn/aSNNW, 2023NNE, 2018
Rainfall11.6 mm11.9 mm (171%)11.6 mm, 20110.0 mm, 2013
Maximum Hourly Rain3.1 mm10:430.8 mm4.4 mm, 20100.3 mm, 2012
Maximum 10-min Rain1.1 mm05:450.3 mm2.2 mm, 20100.3 mm, 2012
Maximum Rain Rate15 mm/h10:293.8 mm/h50 mm/h, 201015 mm/h, 2011
Minimum Dew Point10.2 °C00:118.5 °C13.2 °C, 20266.8 °C, 2014
Maximum Dew Point18.1 °C14:2515.7 °C18.9 °C, 202612.0 °C, 2017
Mean Dew Point14.9 °C12.5 °C15.9 °C, 20269.1 °C, 2014
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)16.9 °C07:4016.1 °C18.9 °C, 201810.9 °C, 2020
Day Maximum (09-21)20.2 °C19:3026.4 °C30.8 °C, 202619.4 °C, 2023
Max 10m Temp Rise0.5 °C04:190.7 °C1.0 °C, 20200.3 °C, 2009
Max 1hr Temp Rise0.7 °C04:192.5 °C4.8 °C, 20200.7 °C, 2009
Max 1hr Hum Rise8%02:598%27%, 20185%, 2009
Max 10m Temp Fall1.0 °C02:020.7 °C1.0 °C, 20100.2 °C, 2009
Max 1hr Temp Fall3.4 °C21:441.8 °C3.9 °C, 20180.6 °C, 2009
Max 1hr Hum Fall9%19:3811%23%, 20203%, 2009
Max 10m Wind Speed8.5 mph15:168.2 mph16.8 mph, 20165.3 mph, 2021
Minimum Feels-like18.9 °C02:0217.5 °C23.6 °C, 201812.0 °C, 2020
Maximum Feels-like25.5 °C14:3329.9 °C36.0 °C, 202621.6 °C, 2015
Mean Feels-like22.3 °C23.8 °C28.2 °C, 202618.8 °C, 2010
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m30.6 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m317.3 µg/m3, 202617.3 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m38.3 µg/m3, 20268.3 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range3.6 °C (-5.1)10.4 °C13.8 °C, 20263.6 °C, 2011
Humidity Range35%38%56%, 202020%, 2010
Pressure Range7 hPa3 hPa7 hPa, 20252 hPa, 2009
ObservationDetail
Sun Hours1 hrs [7%]
Wet Hours6 hrs
Cloud Coveram: Overcast
pm: Overcast transitioned to Partly Cloudy
EventsNone
Comments05-08 M Shs; 09-13 L/M Rn; 15? 17 L Shs
Observer Absent?No
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 4th August 2011. 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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