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Daily Report for 20th July 2017

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature15.3 °C (+0.7)23:5715.9 °C (+1.9)18.7 °C (+4.1), 20149.6 °C (-5.0), 2026
Maximum Temperature20.4 °C (-2.9)17:1324.7 °C (+1.8)31.7 °C (+8.4), 202118.6 °C (-4.7), 2012
Mean Temperature18.2 °C (-1.1)20.2 °C (+1.9)24.3 °C, 201614.9 °C, 2012
Minimum Humidity41%17:4145%73%, 202431%, 2016
Maximum Humidity85%06:2378%95%, 201956%, 2010
Mean Humidity68%61%81%, 202443%, 2010
Minimum Pressure1006 hPa06:071013 hPa1027 hPa, 20261001 hPa, 2025
Maximum Pressure1011 hPa18:421020 hPa1029 hPa, 20261005 hPa, 2025
Mean Pressure1009 hPa1017 hPa1028 hPa, 20261002 hPa, 2025
Mean Wind Speed5.7 mph (+1.4)3.6 mph (-0.7)8.3 mph, 20161.9 mph, 2021
Maximum Wind Speed14.4 mph11:5411.2 mph20.8 mph, 20167.8 mph, 2014
Maximum Gust24.1 mph13:0617.1 mph30.6 mph, 201610.7 mph, 2011
Mean Wind Directionn/aSWN, 2012N, 2020
Rainfall0.5 mm45.9 mm (155%)9.2 mm, 20190.0 mm, 2009
Maximum Hourly Rain0.3 mm03:030.8 mm4.8 mm, 20210.2 mm, 2022
Maximum 10-min Rain0.3 mm03:030.4 mm3.0 mm, 20110.2 mm, 2015
Maximum Rain Raten/a6 mm/h20 mm/h, 20116 mm/h, 2012
Minimum Dew Point6.1 °C19:159.1 °C15.6 °C, 20241.0 °C, 2015
Maximum Dew Point16.3 °C09:1714.7 °C20.5 °C, 202110.2 °C, 2020
Mean Dew Point11.9 °C12.0 °C17.8 °C, 20218.6 °C, 2020
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)17.7 °C05:2316.0 °C20.9 °C, 20169.6 °C, 2026
Day Maximum (09-21)20.4 °C17:1324.7 °C31.7 °C, 202118.6 °C, 2012
Max 10m Temp Rise0.7 °C14:000.6 °C0.9 °C, 20130.4 °C, 2009
Max 1hr Temp Rise2.4 °C14:412.2 °C3.0 °C, 20161.3 °C, 2011
Max 1hr Hum Rise10%21:068%23%, 20216%, 2009
Max 10m Temp Fall0.6 °C11:120.5 °C1.2 °C, 20210.3 °C, 2013
Max 1hr Temp Fall2.3 °C11:261.9 °C4.8 °C, 20211.1 °C, 2013
Max 1hr Hum Fall17%14:5810%17%, 20177%, 2010
Max 10m Wind Speed10.7 mph16:438.2 mph16.7 mph, 20163.7 mph, 2009
Minimum Feels-like15.7 °C23:5517.5 °C23.5 °C, 20148.8 °C, 2026
Maximum Feels-like24.5 °C09:2927.5 °C38.6 °C, 202120.5 °C, 2011
Mean Feels-like20.6 °C22.6 °C29.3 °C, 202116.7 °C, 2012
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m32.7 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m37.6 µg/m3, 20267.6 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m34.6 µg/m3, 20264.6 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range5.1 °C (-3.6)8.9 °C17.1 °C, 20265.1 °C, 2017
Humidity Range44%34%53%, 202117%, 2024
Pressure Range5 hPa6 hPa11 hPa, 20102 hPa, 2011
ObservationDetail
Sun Hours3.4 hrs [23%]
Wet Hours1 hrs
Cloud Coveram: Mostly Cloudy
pm: Partly Cloudy transitioned to Mostly Cloudy
EventsNone
CommentsShs
Observer Absent?Yes - observations may be unreliable
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 20th July 2017. 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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