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Daily Report for 8th September 2017

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature12.4 °C (+0.1)23:3711.6 °C (-1.0)17.4 °C (+5.1), 20236.9 °C (-5.4), 2019
Maximum Temperature17.9 °C (-2.5)17:3420.0 °C (-0.9)29.7 °C (+9.3), 202316.0 °C (-4.4), 2015
Mean Temperature15.3 °C (-1.2)16.0 °C (-0.9)23.2 °C, 202312.1 °C, 2019
Minimum Humidity70%18:1358%80%, 202224%, 2012
Maximum Humidity93%08:2690%97%, 202282%, 2016
Mean Humidity84%75%91%, 202254%, 2012
Minimum Pressure996 hPa21:451011 hPa1025 hPa, 2015996 hPa, 2017
Maximum Pressure1007 hPa00:301018 hPa1031 hPa, 20151007 hPa, 2017
Mean Pressure1000 hPa1015 hPa1028 hPa, 20151000 hPa, 2017
Mean Wind Speed5.8 mph (+1.9)4.0 mph (+0.1)6.6 mph, 20160.7 mph, 2024
Maximum Wind Speed16.2 mph00:0712.2 mph22.3 mph, 20165.9 mph, 2014
Maximum Gust23.0 mph00:0318.4 mph33.9 mph, 20167.6 mph, 2014
Mean Wind Directionn/aSSWN, 2019NNE, 2014
Rainfall5.7 mm15.9 mm (119%)15.8 mm, 20260.0 mm, 2009
Maximum Hourly Rain2.2 mm12:500.8 mm6.0 mm, 20240.6 mm, 2013
Maximum 10-min Rain0.7 mm12:370.4 mm4.1 mm, 20100.5 mm, 2021
Maximum Rain Rate13 mm/h07:574.1 mm/h50 mm/h, 20103.6 mm/h, 2021
Minimum Dew Point10.3 °C20:428.7 °C16.1 °C, 20234.0 °C, 2012
Maximum Dew Point14.6 °C14:0913.9 °C21.7 °C, 20238.9 °C, 2019
Mean Dew Point12.6 °C11.2 °C18.6 °C, 20236.5 °C, 2019
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)14.4 °C08:1312.0 °C17.8 °C, 20166.9 °C, 2019
Day Maximum (09-21)17.9 °C17:3420.0 °C29.7 °C, 202316.0 °C, 2015
Max 10m Temp Rise0.3 °C15:560.6 °C1.2 °C, 20120.3 °C, 2011
Max 1hr Temp Rise1.0 °C16:081.9 °C4.9 °C, 20121.0 °C, 2017
Max 1hr Hum Rise8%19:179%16%, 20134%, 2020
Max 10m Temp Fall0.8 °C18:240.7 °C1.4 °C, 20130.3 °C, 2015
Max 1hr Temp Fall2.9 °C19:061.7 °C4.0 °C, 20121.1 °C, 2018
Max 1hr Hum Fall10%16:069%18%, 20135%, 2015
Max 10m Wind Speed11.8 mph00:169.0 mph17.7 mph, 20164.1 mph, 2014
Minimum Feels-like14.2 °C23:3512.6 °C22.1 °C, 20235.3 °C, 2019
Maximum Feels-like20.8 °C17:2222.8 °C38.2 °C, 202317.1 °C, 2015
Mean Feels-like17.9 °C18.0 °C29.8 °C, 202311.8 °C, 2019
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m31.8 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m313.0 µg/m3, 202613.0 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m34.0 µg/m3, 20264.0 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range5.5 °C (-2.6)8.4 °C17.2 °C, 20125.3 °C, 2022
Humidity Range23%32%60%, 201217%, 2022
Pressure Range11 hPa7 hPa11 hPa, 20172 hPa, 2023
ObservationDetail
Sun Hours1.2 hrs [10%]
Wet Hours6 hrs
Cloud Coveram: Overcast
pm: Overcast transitioned to Partly Cloudy
EventsNone
Comments06-14 Rn spells
Observer Absent?Yes - observations may be unreliable
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 8th September 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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