Daily Report for 25th August 2020

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.4 °C (+1.9)	09:14	16.4 °C (+2.3)	18.5 °C (+5.0), 2016	7.8 °C (-5.7), 2018
Maximum Temperature	21.1 °C (-0.7)	16:30	25.7 °C (+3.1)	31.9 °C (+10.1), 2019	16.8 °C (-5.0), 2014
Mean Temperature	17.6 °C (+0.6)		20.8 °C (+2.7)	23.5 °C, 2019	12.5 °C, 2018
Minimum Humidity	71%	17:37	54%	80%, 2022	32%, 2019
Maximum Humidity	92%	04:48	88%	98%, 2013	82%, 2026
Mean Humidity	84%		73%	90%, 2022	55%, 2025
Minimum Pressure	998 hPa	17:38	1011 hPa	1024 hPa, 2021	998 hPa, 2020
Maximum Pressure	1013 hPa	00:01	1016 hPa	1030 hPa, 2021	1006 hPa, 2012
Mean Pressure	1003 hPa		1014 hPa	1027 hPa, 2021	1002 hPa, 2012
Mean Wind Speed	9.8 mph (+5.8)		4.6 mph (+0.6)	9.8 mph, 2020	1.0 mph, 2017
Maximum Wind Speed	26.5 mph	23:45	13.6 mph	26.5 mph, 2020	6.9 mph, 2014
Maximum Gust	39.2 mph	23:46	21.2 mph	39.2 mph, 2020	10.2 mph, 2014
Mean Wind Direction	n/a		S	NNW, 2023	N, 2022
Rainfall	6.6 mm		43.9 mm (101%)	38.5 mm, 2014	0.0 mm, 2017
Maximum Hourly Rain	1.4 mm	04:33	0.9 mm	9.2 mm, 2014	0.2 mm, 2016
Maximum 10-min Rain	0.7 mm	07:29	0.3 mm	3.3 mm, 2014	0.2 mm, 2016
Maximum Rain Rate	18 mm/h	04:33	7 mm/h	48 mm/h, 2022	1.5 mm/h, 2009
Minimum Dew Point	12.6 °C	23:45	13.1 °C	15.7 °C, 2016	6.6 °C, 2018
Maximum Dew Point	16.9 °C	12:38	17.6 °C	19.0 °C, 2016	11.6 °C, 2018
Mean Dew Point	14.8 °C		15.3 °C	17.1 °C, 2016	8.4 °C, 2018
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.5 °C	08:55	16.7 °C	18.5 °C, 2016	7.8 °C, 2018
Day Maximum (09-21)	21.1 °C	16:43	25.7 °C	31.9 °C, 2019	16.8 °C, 2014
Max 10m Temp Rise	0.6 °C	13:01	0.7 °C	0.9 °C, 2025	0.2 °C, 2014
Max 1hr Temp Rise	1.6 °C	12:16	2.4 °C	4.7 °C, 2025	1.0 °C, 2014
Max 1hr Hum Rise	11%	19:05	9%	24%, 2009	5%, 2022
Max 10m Temp Fall	0.6 °C	18:57	0.6 °C	1.3 °C, 2018	0.2 °C, 2014
Max 1hr Temp Fall	2.1 °C	19:18	2.0 °C	3.3 °C, 2009	0.4 °C, 2014
Max 1hr Hum Fall	12%	13:34	10%	19%, 2025	1%, 2014
Max 10m Wind Speed	17.6 mph	14:21	9.6 mph	17.6 mph, 2020	4.6 mph, 2017
Minimum Feels-like	18.7 °C	09:01	19.9 °C	22.9 °C, 2016	5.0 °C, 2018
Maximum Feels-like	25.8 °C	16:28	30.7 °C	36.0 °C, 2019	18.9 °C, 2018
Mean Feels-like	21.4 °C		25.1 °C	27.8 °C, 2016	12.5 °C, 2018
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	3.8 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	14.2 µg/m³, 2026	14.2 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	6.2 µg/m³, 2026	6.2 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.7 °C (-2.6)		9.3 °C	16.1 °C, 2019	3.3 °C, 2014
Humidity Range	21%		35%	57%, 2019	16%, 2022
Pressure Range	15 hPa		4 hPa	15 hPa, 2020	2 hPa, 2019

Observation	Detail
Sun Hours	1 hrs [8%]
Wet Hours	7 hrs
Cloud Cover	am: Overcast pm: Mostly Cloudy
Events	None
Comments	am Rn? eve Sh
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	19.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 25th August 2020. 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