Daily Report for 6th September 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	10.2 °C (-2.2)	06:56	11.7 °C (-1.0)	19.3 °C (+6.9), 2016	5.6 °C (-6.8), 2015
Maximum Temperature	17.9 °C (-2.8)	17:27	19.8 °C (-1.3)	30.6 °C (+9.9), 2023	17.9 °C (-2.8), 2011
Mean Temperature	13.8 °C (-2.5)		15.6 °C (-1.1)	22.6 °C, 2023	12.3 °C, 2015
Minimum Humidity	70%	12:12	50%	89%, 2024	36%, 2026
Maximum Humidity	86%	22:22	85%	97%, 2022	77%, 2009
Mean Humidity	78%		70%	94%, 2024	60%, 2012
Minimum Pressure	1019 hPa	18:55	1018 hPa	1026 hPa, 2015	1000 hPa, 2010
Maximum Pressure	1028 hPa	00:13	1025 hPa	1030 hPa, 2012	1010 hPa, 2013
Mean Pressure	1022 hPa		1022 hPa	1028 hPa, 2015	1008 hPa, 2010
Mean Wind Speed	5.4 mph (+1.5)		5.5 mph (+1.6)	9.8 mph, 2011	0.4 mph, 2021
Maximum Wind Speed	18.4 mph	12:11	14.9 mph	21.0 mph, 2011	4.6 mph, 2021
Maximum Gust	31.1 mph	12:10	24.4 mph	33.9 mph, 2011	6.4 mph, 2014
Mean Wind Direction	n/a		W	NNW, 2014	ESE, 2010
Rainfall	0.1 mm		6.0 mm (60%)	21.7 mm, 2011	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.5 mm	18.4 mm, 2011	0.2 mm, 2024
Maximum 10-min Rain	n/a		0.1 mm	7.4 mm, 2011	0.2 mm, 2024
Maximum Rain Rate	n/a		1.1 mm/h	100 mm/h, 2011	2.6 mm/h, 2013
Minimum Dew Point	7.7 °C	02:12	6.6 °C	16.8 °C, 2016	4.1 °C, 2015
Maximum Dew Point	13.3 °C	18:40	12.6 °C	21.6 °C, 2023	10.1 °C, 2015
Mean Dew Point	10.0 °C		9.8 °C	19.0 °C, 2016	6.6 °C, 2015
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	10.2 °C	06:56	11.8 °C	19.9 °C, 2016	5.6 °C, 2015
Day Maximum (09-21)	17.9 °C	17:46	19.8 °C	30.6 °C, 2023	16.9 °C, 2013
Max 10m Temp Rise	0.5 °C	11:33	0.6 °C	0.9 °C, 2012	0.2 °C, 2011
Max 1hr Temp Rise	1.9 °C	11:48	2.1 °C	4.7 °C, 2012	0.8 °C, 2011
Max 1hr Hum Rise	7%	21:12	8%	16%, 2025	2%, 2024
Max 10m Temp Fall	0.3 °C	22:00	0.5 °C	1.0 °C, 2022	0.3 °C, 2013
Max 1hr Temp Fall	1.7 °C	22:02	1.6 °C	3.3 °C, 2021	1.0 °C, 2018
Max 1hr Hum Fall	9%	11:59	12%	19%, 2012	5%, 2016
Max 10m Wind Speed	13.1 mph	12:11	10.7 mph	14.0 mph, 2025	2.9 mph, 2021
Minimum Feels-like	9.6 °C	02:12	11.9 °C	24.5 °C, 2016	3.9 °C, 2015
Maximum Feels-like	20.8 °C	18:40	21.5 °C	39.2 °C, 2023	18.9 °C, 2015
Mean Feels-like	15.2 °C		16.9 °C	28.6 °C, 2023	12.4 °C, 2015
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	2.1 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	9.2 µg/m³, 2026	9.2 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	4.7 µg/m³, 2026	4.7 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	7.7 °C (-0.6)		8.1 °C	15.2 °C, 2023	3.9 °C, 2016
Humidity Range	16%		34%	52%, 2012	8%, 2024
Pressure Range	9 hPa		7 hPa	20 hPa, 2016	2 hPa, 2023

Observation	Detail
Sun Hours	1 hrs [8%]
Wet Hours	0.5 hrs
Cloud Cover	am: Overcast pm: Overcast transitioned to Partly Cloudy
Events	None
Comments	poss lunctime Rn
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	19.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 6th September 2019. 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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Daily Graph of Conditions

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions

Full resolution images at up-to 5 minute intervals