Daily Report for 6th August 2021

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	14.2 °C (-0.2)	23:51	12.9 °C (-1.6)	18.6 °C (+4.2), 2020	10.1 °C (-4.3), 2025
Maximum Temperature	22.3 °C (-0.9)	15:03	21.4 °C (-1.8)	31.6 °C (+8.4), 2018	19.9 °C (-3.3), 2011
Mean Temperature	17.3 °C (-0.6)		17.0 °C (-1.7)	24.2 °C, 2018	15.2 °C, 2023
Minimum Humidity	58%	15:03	59%	65%, 2024	28%, 2018
Maximum Humidity	90%	06:00	93%	97%, 2009	75%, 2026
Mean Humidity	82%		79%	84%, 2009	54%, 2026
Minimum Pressure	997 hPa	05:13	1008 hPa	1028 hPa, 2022	997 hPa, 2021
Maximum Pressure	1002 hPa	22:23	1013 hPa	1031 hPa, 2022	1002 hPa, 2021
Mean Pressure	1000 hPa		1010 hPa	1029 hPa, 2022	1000 hPa, 2021
Mean Wind Speed	7.8 mph (+3.8)		3.1 mph (-0.9)	7.8 mph, 2021	1.7 mph, 2022
Maximum Wind Speed	17.8 mph	14:35	10.6 mph	17.8 mph, 2021	6.7 mph, 2013
Maximum Gust	28.5 mph	13:07	16.5 mph	28.5 mph, 2021	9.8 mph, 2013
Mean Wind Direction	n/a		SW	NNW, 2023	N, 2022
Rainfall	6.0 mm		8.4 mm (80%)	34.3 mm, 2009	0.0 mm, 2013
Maximum Hourly Rain	3.4 mm	18:08	0.8 mm	9.9 mm, 2009	0.4 mm, 2019
Maximum 10-min Rain	2.6 mm	18:03	0.6 mm	4.7 mm, 2009	0.4 mm, 2019
Maximum Rain Rate	42 mm/h	18:01	8 mm/h	66 mm/h, 2009	7 mm/h, 2019
Minimum Dew Point	11.9 °C	23:19	11.0 °C	14.2 °C, 2009	6.0 °C, 2026
Maximum Dew Point	16.2 °C	16:30	14.9 °C	19.4 °C, 2009	10.4 °C, 2026
Mean Dew Point	14.1 °C		13.0 °C	16.9 °C, 2020	8.2 °C, 2026
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.7 °C	04:17	13.4 °C	18.9 °C, 2020	10.1 °C, 2025
Day Maximum (09-21)	22.3 °C	15:03	21.4 °C	31.6 °C, 2018	19.9 °C, 2011
Max 10m Temp Rise	0.6 °C	10:18	0.7 °C	1.0 °C, 2010	0.4 °C, 2011
Max 1hr Temp Rise	1.9 °C	10:32	2.3 °C	4.7 °C, 2018	1.7 °C, 2019
Max 1hr Hum Rise	19%	16:29	12%	19%, 2021	6%, 2017
Max 10m Temp Fall	1.0 °C	16:37	0.6 °C	1.0 °C, 2021	0.3 °C, 2010
Max 1hr Temp Fall	2.4 °C	17:16	1.8 °C	3.6 °C, 2020	1.3 °C, 2017
Max 1hr Hum Fall	10%	13:27	11%	21%, 2018	8%, 2009
Max 10m Wind Speed	14.9 mph	13:07	8.1 mph	14.9 mph, 2021	4.6 mph, 2022
Minimum Feels-like	16.4 °C	23:41	14.7 °C	22.3 °C, 2020	10.1 °C, 2025
Maximum Feels-like	25.6 °C	15:02	24.7 °C	34.4 °C, 2018	21.6 °C, 2011
Mean Feels-like	20.7 °C		19.8 °C	27.6 °C, 2020	17.1 °C, 2023
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	1.3 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	8.4 µg/m³, 2026	8.4 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	3.1 µg/m³, 2026	3.1 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	8.1 °C (-0.7)		8.5 °C	16.8 °C, 2018	5.1 °C, 2011
Humidity Range	32%		34%	64%, 2018	27%, 2011
Pressure Range	5 hPa		5 hPa	9 hPa, 2011	2 hPa, 2010

Observation	Detail
Sun Hours	1 hrs [7%]
Wet Hours	3 hrs
Cloud Cover	Mostly Cloudy with periods of Partly Cloudy
Events	None
Comments	pm shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	19.0 °C

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

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions

Full resolution images at up-to 5 minute intervals