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Daily Report for 30th July 2017

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature14.8 °C (+0.1)06:5315.2 °C (+1.0)18.2 °C (+3.5), 20269.1 °C (-5.6), 2011
Maximum Temperature20.2 °C (-3.1)15:0023.4 °C (+0.4)31.0 °C (+7.7), 202417.8 °C (-5.5), 2021
Mean Temperature17.6 °C (-1.5)19.1 °C (+0.7)23.4 °C, 202415.2 °C, 2015
Minimum Humidity51%18:1848%74%, 202131%, 2020
Maximum Humidity86%03:0680%95%, 200973%, 2014
Mean Humidity70%65%85%, 201354%, 2020
Minimum Pressure1004 hPa04:351011 hPa1019 hPa, 2025999 hPa, 2021
Maximum Pressure1009 hPa23:461017 hPa1025 hPa, 20111008 hPa, 2019
Mean Pressure1007 hPa1015 hPa1022 hPa, 20111004 hPa, 2021
Mean Wind Speed5.7 mph (+1.4)4.0 mph (-0.3)7.6 mph, 20191.0 mph, 2024
Maximum Wind Speed14.0 mph17:2811.9 mph19.9 mph, 20197.2 mph, 2024
Maximum Gust21.0 mph15:3318.1 mph36.9 mph, 201910.4 mph, 2024
Mean Wind Directionn/aSWNNW, 2025NNE, 2011
Rainfall17.8 mm89.0 mm (200%)17.8 mm, 20170.0 mm, 2011
Maximum Hourly Rain16.0 mm02:511.5 mm16.0 mm, 20171.1 mm, 2009
Maximum 10-min Rain5.1 mm02:360.6 mm5.1 mm, 20170.9 mm, 2009
Maximum Rain Rate50 mm/h02:3210 mm/h50 mm/h, 20177 mm/h, 2023
Minimum Dew Point9.0 °C19:329.4 °C13.8 °C, 20242.5 °C, 2012
Maximum Dew Point15.0 °C01:5214.5 °C19.1 °C, 20248.9 °C, 2015
Mean Dew Point11.8 °C11.9 °C16.4 °C, 20246.2 °C, 2012
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)14.8 °C06:5315.3 °C18.2 °C, 20199.1 °C, 2011
Day Maximum (09-21)20.2 °C15:0023.4 °C31.0 °C, 202417.8 °C, 2021
Max 10m Temp Rise0.5 °C12:550.6 °C1.0 °C, 20110.4 °C, 2016
Max 1hr Temp Rise1.7 °C09:242.1 °C4.5 °C, 20111.4 °C, 2013
Max 1hr Hum Rise6%23:518%19%, 20205%, 2013
Max 10m Temp Fall0.4 °C19:160.5 °C0.8 °C, 20210.3 °C, 2010
Max 1hr Temp Fall1.4 °C19:541.9 °C3.0 °C, 20201.2 °C, 2010
Max 1hr Hum Fall12%10:5510%17%, 20188%, 2013
Max 10m Wind Speed11.4 mph17:258.8 mph15.9 mph, 20214.1 mph, 2024
Minimum Feels-like17.1 °C06:5316.8 °C21.5 °C, 20268.2 °C, 2011
Maximum Feels-like22.2 °C14:5026.1 °C37.5 °C, 202418.8 °C, 2015
Mean Feels-like19.9 °C21.4 °C28.3 °C, 202415.4 °C, 2015
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m31.4 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m36.0 µg/m3, 20266.0 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m33.5 µg/m3, 20263.5 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range5.4 °C (-3.2)8.2 °C16.6 °C, 20203.1 °C, 2021
Humidity Range35%32%56%, 202017%, 2021
Pressure Range5 hPa6 hPa12 hPa, 20092 hPa, 2012
ObservationDetail
Sun Hours5.5 hrs [39%]
Wet Hours2 hrs
Cloud CoverPartly Cloudy with periods of Mostly Cloudy
EventsNone
Commentso.night Rn/Shs
Observer Absent?Yes - observations may be unreliable
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 30th 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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