Daily Report for 4th August 2020

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	10.9 °C (-3.6)	05:57	13.8 °C (-0.7)	18.9 °C (+4.4), 2018	10.9 °C (-3.6), 2020
Maximum Temperature	23.2 °C (-0.0)	15:39	23.9 °C (+0.6)	30.8 °C (+7.6), 2026	19.4 °C (-3.8), 2023
Mean Temperature	17.7 °C (-1.8)		19.2 °C (-0.0)	23.6 °C, 2026	16.4 °C, 2010
Minimum Humidity	40%	15:04	42%	71%, 2023	36%, 2014
Maximum Humidity	96%	07:17	84%	96%, 2020	75%, 2014
Mean Humidity	68%		64%	83%, 2009	54%, 2014
Minimum Pressure	1015 hPa	20:03	1015 hPa	1022 hPa, 2018	1004 hPa, 2010
Maximum Pressure	1019 hPa	00:08	1019 hPa	1026 hPa, 2018	1011 hPa, 2010
Mean Pressure	1017 hPa		1017 hPa	1024 hPa, 2018	1008 hPa, 2010
Mean Wind Speed	5.4 mph (+1.4)		5.2 mph (+1.2)	9.7 mph, 2016	1.2 mph, 2021
Maximum Wind Speed	14.9 mph	19:37	12.9 mph	23.2 mph, 2016	6.4 mph, 2021
Maximum Gust	23.0 mph	18:16	19.6 mph	33.9 mph, 2016	11.4 mph, 2021
Mean Wind Direction	n/a		W	NNW, 2023	NNE, 2018
Rainfall	0.0 mm		0.1 mm (1%)	11.6 mm, 2011	0.0 mm, 2013
Maximum Hourly Rain	n/a		0.0 mm	4.4 mm, 2010	0.3 mm, 2012
Maximum 10-min Rain	n/a		0.0 mm	2.2 mm, 2010	0.3 mm, 2012
Maximum Rain Rate	n/a		0 mm/h	50 mm/h, 2010	15 mm/h, 2011
Minimum Dew Point	8.2 °C	14:05	9.5 °C	13.2 °C, 2026	6.8 °C, 2014
Maximum Dew Point	13.7 °C	09:15	14.5 °C	18.9 °C, 2026	12.0 °C, 2017
Mean Dew Point	11.2 °C		11.9 °C	15.9 °C, 2026	9.1 °C, 2014
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	10.9 °C	06:00	13.8 °C	18.9 °C, 2018	10.9 °C, 2020
Day Maximum (09-21)	23.2 °C	15:40	23.9 °C	30.8 °C, 2026	19.4 °C, 2023
Max 10m Temp Rise	1.0 °C	07:56	0.7 °C	1.0 °C, 2020	0.3 °C, 2009
Max 1hr Temp Rise	4.8 °C	08:04	2.9 °C	4.8 °C, 2020	0.7 °C, 2009
Max 1hr Hum Rise	8%	20:17	12%	27%, 2018	5%, 2009
Max 10m Temp Fall	0.6 °C	16:22	0.6 °C	1.0 °C, 2010	0.2 °C, 2009
Max 1hr Temp Fall	1.9 °C	01:39	1.9 °C	3.9 °C, 2018	0.6 °C, 2009
Max 1hr Hum Fall	23%	08:22	13%	23%, 2020	3%, 2009
Max 10m Wind Speed	11.6 mph	15:49	9.5 mph	16.8 mph, 2016	5.3 mph, 2021
Minimum Feels-like	12.0 °C	05:34	15.5 °C	23.6 °C, 2018	12.0 °C, 2020
Maximum Feels-like	24.6 °C	17:36	25.9 °C	36.0 °C, 2026	21.6 °C, 2015
Mean Feels-like	19.6 °C		21.5 °C	28.2 °C, 2026	18.8 °C, 2010
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	0.6 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	17.3 µg/m³, 2026	17.3 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	8.3 µg/m³, 2026	8.3 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	12.3 °C (+3.6)		10.1 °C	13.8 °C, 2026	3.6 °C, 2011
Humidity Range	56%		43%	56%, 2020	20%, 2010
Pressure Range	4 hPa		4 hPa	7 hPa, 2025	2 hPa, 2009

Observation	Detail
Sun Hours	9 hrs [65%]
Wet Hours	0 hrs
Cloud Cover	am: Mostly Sunny transitioned to Overcast pm: Mostly Cloudy transitioned to Sunny
Events	None
Comments	-
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	20.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 4th 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