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Daily Report for 11th September 2021

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature15.6 °C (+3.6)23:5714.7 °C (+2.2)19.3 °C (+7.3), 20238.1 °C (-3.9), 2020
Maximum Temperature22.3 °C (+2.5)14:4822.7 °C (+2.1)25.1 °C (+5.3), 202315.3 °C (-4.5), 2024
Mean Temperature18.9 °C (+3.1)18.4 °C (+2.2)21.7 °C, 202310.7 °C, 2024
Minimum Humidity61%15:2363%76%, 201837%, 2012
Maximum Humidity90%01:2191%97%, 202279%, 2012
Mean Humidity78%79%84%, 202258%, 2012
Minimum Pressure1015 hPa00:061018 hPa1034 hPa, 2009991 hPa, 2017
Maximum Pressure1019 hPa23:391023 hPa1038 hPa, 20091001 hPa, 2017
Mean Pressure1017 hPa1020 hPa1036 hPa, 2009994 hPa, 2017
Mean Wind Speed3.7 mph (-0.2)3.0 mph (-0.9)8.3 mph, 20172.1 mph, 2020
Maximum Wind Speed9.7 mph14:399.3 mph21.5 mph, 20117.4 mph, 2014
Maximum Gust17.1 mph14:3915.2 mph31.7 mph, 20119.8 mph, 2014
Mean Wind Directionn/aSENNW, 2013NE, 2014
Rainfall0.0 mm7.2 mm (39%)7.7 mm, 20170.0 mm, 2009
Maximum Hourly Rainn/a0.4 mm5.5 mm, 20170.9 mm, 2013
Maximum 10-min Rainn/a0.3 mm3.5 mm, 20170.4 mm, 2013
Maximum Rain Raten/a3.1 mm/h53 mm/h, 20170.9 mm/h, 2013
Minimum Dew Point11.6 °C23:4012.1 °C16.1 °C, 20231.3 °C, 2012
Maximum Dew Point16.5 °C11:3116.8 °C18.3 °C, 20239.9 °C, 2024
Mean Dew Point14.9 °C14.6 °C17.5 °C, 20236.8 °C, 2012
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)17.3 °C07:2114.8 °C19.3 °C, 20238.1 °C, 2020
Day Maximum (09-21)22.3 °C15:0422.7 °C25.1 °C, 202315.3 °C, 2024
Max 10m Temp Rise0.6 °C11:300.6 °C1.0 °C, 20160.3 °C, 2018
Max 1hr Temp Rise2.5 °C11:472.2 °C3.7 °C, 20161.3 °C, 2018
Max 1hr Hum Rise6%18:528%23%, 20254%, 2010
Max 10m Temp Fall0.3 °C19:540.4 °C1.6 °C, 20250.2 °C, 2010
Max 1hr Temp Fall1.5 °C21:071.6 °C4.3 °C, 20251.1 °C, 2010
Max 1hr Hum Fall10%12:248%28%, 20164%, 2018
Max 10m Wind Speed7.7 mph15:516.9 mph14.4 mph, 20174.3 mph, 2014
Minimum Feels-like17.7 °C23:5717.4 °C24.6 °C, 20235.1 °C, 2024
Maximum Feels-like26.4 °C14:4427.5 °C30.8 °C, 202315.8 °C, 2024
Mean Feels-like22.8 °C22.2 °C27.3 °C, 202310.0 °C, 2024
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m30.6 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m312.4 µg/m3, 202612.4 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m32.8 µg/m3, 20262.8 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range6.7 °C (-1.1)8.1 °C12.5 °C, 20164.5 °C, 2010
Humidity Range29%28%51%, 201513%, 2019
Pressure Range5 hPa4 hPa10 hPa, 20172 hPa, 2013
ObservationDetail
Sun Hours4.5 hrs [38%]
Wet Hours0 hrs
Cloud Coveram: Overcast transitioned to Partly Cloudy
pm: Partly Cloudy
EventsNone
Comments-
Observer Absent?Yes - observations may be unreliable
Pond Temperature18.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 11th September 2021. 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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