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Daily Report for 12th September 2017

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature10.2 °C (-1.7)06:5511.1 °C (-1.3)14.6 °C (+2.7), 20116.2 °C (-5.7), 2024
Maximum Temperature18.2 °C (-1.4)15:0319.4 °C (-1.2)25.8 °C (+6.2), 202214.5 °C (-5.1), 2024
Mean Temperature13.7 °C (-1.6)15.2 °C (-1.2)20.3 °C, 202210.0 °C, 2024
Minimum Humidity49%15:0858%72%, 201348%, 2011
Maximum Humidity93%23:4191%97%, 201383%, 2012
Mean Humidity78%77%87%, 201865%, 2015
Minimum Pressure995 hPa23:451005 hPa1028 hPa, 2009995 hPa, 2017
Maximum Pressure1007 hPa13:311013 hPa1034 hPa, 20091007 hPa, 2017
Mean Pressure1004 hPa1009 hPa1031 hPa, 20091004 hPa, 2017
Mean Wind Speed7.8 mph (+3.9)5.0 mph (+1.1)10.8 mph, 20110.8 mph, 2021
Maximum Wind Speed19.9 mph22:5514.0 mph22.1 mph, 20115.6 mph, 2021
Maximum Gust30.0 mph22:5621.6 mph37.4 mph, 20118.7 mph, 2013
Mean Wind Directionn/aSWN, 2024N, 2018
Rainfall2.4 mm26.6 mm (133%)3.1 mm, 20180.0 mm, 2009
Maximum Hourly Rain1.3 mm23:021.1 mm2.3 mm, 20120.3 mm, 2011
Maximum 10-min Rain0.7 mm23:020.6 mm2.3 mm, 20120.2 mm, 2018
Maximum Rain Rate7 mm/h23:029 mm/h60 mm/h, 20121.2 mm/h, 2018
Minimum Dew Point7.2 °C15:008.5 °C13.1 °C, 20222.6 °C, 2012
Maximum Dew Point12.5 °C23:5713.5 °C18.2 °C, 202210.0 °C, 2024
Mean Dew Point9.7 °C10.9 °C16.3 °C, 20236.5 °C, 2024
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)10.2 °C06:5511.4 °C17.7 °C, 20236.2 °C, 2024
Day Maximum (09-21)18.2 °C15:0319.4 °C25.8 °C, 202214.5 °C, 2024
Max 10m Temp Rise0.6 °C13:360.6 °C0.9 °C, 20220.3 °C, 2018
Max 1hr Temp Rise2.3 °C08:562.0 °C3.4 °C, 20121.1 °C, 2018
Max 1hr Hum Rise14%20:2211%19%, 20255%, 2011
Max 10m Temp Fall0.4 °C13:560.7 °C1.3 °C, 20250.3 °C, 2026
Max 1hr Temp Fall1.5 °C20:541.7 °C3.8 °C, 20251.0 °C, 2013
Max 1hr Hum Fall9%08:589%16%, 20146%, 2013
Max 10m Wind Speed14.0 mph23:0110.3 mph14.8 mph, 20113.7 mph, 2021
Minimum Feels-like10.9 °C06:5511.8 °C17.5 °C, 20223.3 °C, 2024
Maximum Feels-like18.7 °C15:0021.7 °C31.8 °C, 202215.6 °C, 2024
Mean Feels-like14.8 °C16.9 °C25.0 °C, 20229.2 °C, 2024
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m32.5 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m38.1 µg/m3, 20268.1 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m34.5 µg/m3, 20264.5 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range8.0 °C (+0.3)8.2 °C14.4 °C, 20165.7 °C, 2013
Humidity Range44%33%44%, 201123%, 2018
Pressure Range12 hPa8 hPa12 hPa, 20172 hPa, 2021
ObservationDetail
Sun Hours7.3 hrs [63%]
Wet Hours3 hrs
Cloud Coveram: Sunny transitioned to Mostly Sunny
pm: Partly Cloudy or Mostly Cloudy
EventsNone
Comments21- Rn
Observer Absent?Yes - observations may be unreliable
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 12th 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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