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Daily Report for 21st July 2011

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature13.1 °C (-1.5)02:4012.9 °C (-1.1)17.6 °C (+3.0), 20249.7 °C (-4.9), 2020
Maximum Temperature19.3 °C (-4.0)15:2320.8 °C (-2.1)29.9 °C (+6.6), 202119.3 °C (-4.0), 2011
Mean Temperature14.9 °C (-2.8)16.8 °C (-1.6)23.2 °C, 202114.9 °C, 2011
Minimum Humidity67%15:1850%67%, 201134%, 2010
Maximum Humidity94%08:0184%95%, 200976%, 2010
Mean Humidity88%67%88%, 201153%, 2010
Minimum Pressure1010 hPa02:441009 hPa1028 hPa, 20261000 hPa, 2025
Maximum Pressure1016 hPa21:201014 hPa1030 hPa, 20261007 hPa, 2025
Mean Pressure1013 hPa1012 hPa1029 hPa, 20261002 hPa, 2025
Mean Wind Speed2.4 mph (-1.9)4.7 mph (+0.4)8.1 mph, 20091.1 mph, 2021
Maximum Wind Speed7.8 mph12.0 mph16.0 mph, 20176.6 mph, 2018
Maximum Gust11.2 mph18:4617.0 mph29.0 mph, 200910.2 mph, 2012
Mean Wind Directionn/aSNNW, 2014N, 2020
Rainfall4.1 mm51.0 mm (164%)4.1 mm, 20110.0 mm, 2010
Maximum Hourly Rain3.6 mm17:011.4 mm3.6 mm, 20110.0 mm, 2021
Maximum 10-min Rain1.6 mm16:100.8 mm1.6 mm, 20110.0 mm, 2021
Maximum Rain Rate30 mm/h16:0615 mm/h30 mm/h, 20113.3 mm/h, 2009
Minimum Dew Point11.0 °C23:517.8 °C15.5 °C, 20216.7 °C, 2020
Maximum Dew Point14.7 °C11:3612.6 °C20.9 °C, 20219.7 °C, 2020
Mean Dew Point12.8 °C10.2 °C17.9 °C, 20218.2 °C, 2020
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)13.1 °C02:3913.0 °C17.9 °C, 20109.7 °C, 2020
Day Maximum (09-21)19.3 °C15:2220.8 °C29.9 °C, 202119.3 °C, 2011
Max 10m Temp Rise0.4 °C14:160.6 °C0.9 °C, 20120.4 °C, 2011
Max 1hr Temp Rise1.5 °C11:342.3 °C3.3 °C, 20181.5 °C, 2011
Max 1hr Hum Rise12%16:2610%16%, 20105%, 2024
Max 10m Temp Fall0.6 °C15:500.5 °C0.6 °C, 20090.3 °C, 2016
Max 1hr Temp Fall2.0 °C16:351.8 °C2.4 °C, 20201.1 °C, 2016
Max 1hr Hum Fall14%14:5410%17%, 20126%, 2022
Max 10m Wind Speed5.2 mph19:018.4 mph11.8 mph, 20153.4 mph, 2009
Minimum Feels-like15.2 °C23:5614.0 °C20.9 °C, 20218.6 °C, 2020
Maximum Feels-like22.4 °C14:2622.5 °C37.5 °C, 202121.8 °C, 2012
Mean Feels-like17.6 °C18.3 °C29.2 °C, 202117.1 °C, 2012
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m33.8 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/m36.8 µg/m3, 20266.8 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range6.2 °C (-2.4)8.0 °C13.3 °C, 20215.5 °C, 2024
Humidity Range27%34%51%, 201826%, 2023
Pressure Range6 hPa5 hPa11 hPa, 20092 hPa, 2023
ObservationDetail
Sun Hours0.2 hrs [1%]
Wet Hours3 hrs
Cloud Coveram: Overcast
pm: Mostly Cloudy transitioned to Overcast
EventsNone
Comments0930 M? 16 H? 1630 H? 19-20 L Shs
Observer Absent?No
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 21st July 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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