Daily Report for 7th September 2022

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.1 °C (+2.8)	23:54	15.3 °C (+2.7)	18.5 °C (+6.2), 2016	8.8 °C (-3.5), 2018
Maximum Temperature	20.6 °C (+0.1)	17:25	23.0 °C (+2.0)	30.5 °C (+9.9), 2023	17.0 °C (-3.6), 2011
Mean Temperature	17.9 °C (+1.4)		19.1 °C (+2.3)	23.6 °C, 2023	13.5 °C, 2015
Minimum Humidity	72%	17:34	64%	78%, 2024	30%, 2012
Maximum Humidity	94%	07:09	93%	98%, 2024	81%, 2026
Mean Humidity	85%		80%	88%, 2024	57%, 2012
Minimum Pressure	1008 hPa	23:54	1012 hPa	1029 hPa, 2015	1000 hPa, 2010
Maximum Pressure	1012 hPa	00:01	1017 hPa	1032 hPa, 2015	1002 hPa, 2010
Mean Pressure	1010 hPa		1014 hPa	1031 hPa, 2015	1001 hPa, 2010
Mean Wind Speed	4.5 mph (+0.6)		4.0 mph (+0.1)	7.6 mph, 2011	0.3 mph, 2024
Maximum Wind Speed	15.4 mph	22:07	13.9 mph	17.3 mph, 2025	6.6 mph, 2024
Maximum Gust	24.2 mph	22:14	21.0 mph	26.5 mph, 2025	7.8 mph, 2014
Mean Wind Direction	n/a		S	N, 2019	N, 2015
Rainfall	9.1 mm		23.2 mm (199%)	9.1 mm, 2022	0.0 mm, 2009
Maximum Hourly Rain	4.3 mm	23:11	1.9 mm	4.3 mm, 2022	0.5 mm, 2011
Maximum 10-min Rain	1.4 mm	04:57	0.9 mm	1.4 mm, 2022	0.3 mm, 2011
Maximum Rain Rate	30 mm/h	04:52	19 mm/h	30 mm/h, 2022	4.5 mm/h, 2013
Minimum Dew Point	13.6 °C	23:54	13.2 °C	16.3 °C, 2023	4.3 °C, 2012
Maximum Dew Point	17.3 °C	13:59	17.2 °C	20.1 °C, 2023	9.4 °C, 2018
Mean Dew Point	15.2 °C		15.4 °C	18.2 °C, 2023	6.9 °C, 2018
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.2 °C	01:06	15.3 °C	18.5 °C, 2016	8.8 °C, 2018
Day Maximum (09-21)	20.6 °C	17:25	23.0 °C	30.5 °C, 2023	17.0 °C, 2011
Max 10m Temp Rise	0.5 °C	08:35	0.6 °C	0.9 °C, 2013	0.4 °C, 2014
Max 1hr Temp Rise	1.7 °C	09:21	2.0 °C	3.5 °C, 2021	1.1 °C, 2009
Max 1hr Hum Rise	9%	12:17	10%	15%, 2023	4%, 2009
Max 10m Temp Fall	1.1 °C	22:19	0.6 °C	1.1 °C, 2022	0.3 °C, 2017
Max 1hr Temp Fall	2.6 °C	22:59	1.8 °C	3.1 °C, 2012	0.8 °C, 2009
Max 1hr Hum Fall	9%	15:01	11%	15%, 2013	3%, 2009
Max 10m Wind Speed	11.2 mph	22:14	9.9 mph	14.1 mph, 2025	4.6 mph, 2014
Minimum Feels-like	18.2 °C	23:50	18.5 °C	24.1 °C, 2016	6.0 °C, 2018
Maximum Feels-like	25.7 °C	15:37	27.9 °C	37.7 °C, 2023	18.5 °C, 2011
Mean Feels-like	21.9 °C		23.3 °C	29.8 °C, 2023	13.6 °C, 2018
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	0.9 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	11.1 µg/m³, 2026	11.1 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	4.0 µg/m³, 2026	4.0 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.5 °C (-2.7)		7.7 °C	14.2 °C, 2012	5.2 °C, 2011
Humidity Range	22%		30%	57%, 2012	12%, 2009
Pressure Range	4 hPa		5 hPa	12 hPa, 2016	2 hPa, 2010

Observation	Detail
Sun Hours	6 hrs [50%]
Wet Hours	5 hrs
Cloud Cover	am: Mostly Sunny pm: Partly Cloudy
Events	Light Thunderstorm
Comments	"""""""""""""""shs w thunder late"""""""""""""""
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	20.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 7th September 2022. 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