Daily Report for 21st June 2020

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	14.7 °C (+2.2)	07:42	11.6 °C (-0.1)	16.7 °C (+4.2), 2026	9.4 °C (-3.1), 2022
Maximum Temperature	22.8 °C (+1.3)	16:33	20.1 °C (-0.5)	33.0 °C (+11.5), 2017	13.7 °C (-7.8), 2021
Mean Temperature	18.1 °C (+1.8)		15.8 °C (-0.3)	24.9 °C, 2025	12.6 °C, 2021
Minimum Humidity	48%	16:13	53%	85%, 2021	34%, 2018
Maximum Humidity	91%	08:42	89%	95%, 2024	69%, 2014
Mean Humidity	69%		72%	88%, 2021	51%, 2014
Minimum Pressure	1015 hPa	06:06	1011 hPa	1024 hPa, 2026	1001 hPa, 2012
Maximum Pressure	1024 hPa	23:58	1016 hPa	1030 hPa, 2018	1011 hPa, 2011
Mean Pressure	1018 hPa		1013 hPa	1026 hPa, 2026	1006 hPa, 2012
Mean Wind Speed	6.9 mph (+2.5)		4.3 mph (-0.1)	8.2 mph, 2011	0.9 mph, 2022
Maximum Wind Speed	16.8 mph	17:59	12.8 mph	19.7 mph, 2011	7.5 mph, 2010
Maximum Gust	24.2 mph	17:34	20.1 mph	32.9 mph, 2011	10.6 mph, 2010
Mean Wind Direction	n/a		SSE	N, 2010	NE, 2021
Rainfall	1.0 mm		36.8 mm (112%)	6.9 mm, 2012	0.0 mm, 2009
Maximum Hourly Rain	0.9 mm	08:00	0.8 mm	4.3 mm, 2012	0.9 mm, 2020
Maximum 10-min Rain	0.3 mm	07:30	0.5 mm	4.3 mm, 2012	0.3 mm, 2020
Maximum Rain Rate	1.0 mm/h	07:14	7 mm/h	90 mm/h, 2013	1.0 mm/h, 2020
Minimum Dew Point	8.8 °C	23:37	8.5 °C	14.6 °C, 2026	3.7 °C, 2018
Maximum Dew Point	15.0 °C	10:36	12.7 °C	19.2 °C, 2026	9.2 °C, 2018
Mean Dew Point	12.1 °C		10.5 °C	17.4 °C, 2026	5.9 °C, 2018
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	14.7 °C	07:42	11.7 °C	16.7 °C, 2026	9.4 °C, 2022
Day Maximum (09-21)	22.8 °C	16:34	20.1 °C	33.0 °C, 2017	13.7 °C, 2021
Max 10m Temp Rise	0.7 °C	11:29	0.7 °C	1.0 °C, 2012	0.2 °C, 2021
Max 1hr Temp Rise	2.5 °C	11:33	2.2 °C	4.7 °C, 2024	0.6 °C, 2021
Max 1hr Hum Rise	13%	18:22	10%	16%, 2014	4%, 2021
Max 10m Temp Fall	0.8 °C	18:02	0.7 °C	0.8 °C, 2013	0.3 °C, 2016
Max 1hr Temp Fall	2.4 °C	18:14	1.9 °C	2.7 °C, 2013	0.7 °C, 2021
Max 1hr Hum Fall	15%	11:19	12%	17%, 2024	4%, 2021
Max 10m Wind Speed	12.2 mph	18:01	9.4 mph	15.0 mph, 2011	3.7 mph, 2022
Minimum Feels-like	15.5 °C	23:52	12.2 °C	20.5 °C, 2026	9.7 °C, 2022
Maximum Feels-like	25.0 °C	16:46	22.1 °C	38.7 °C, 2017	16.0 °C, 2021
Mean Feels-like	20.4 °C		17.5 °C	29.3 °C, 2017	14.2 °C, 2021
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	0.0 µg/m³, 2009	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	n/a	n/a
Mean PM2.5	n/a		0.0 µg/m³	n/a	n/a
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	8.1 °C (-0.9)		8.5 °C	17.4 °C, 2017	2.5 °C, 2021
Humidity Range	43%		36%	57%, 2022	8%, 2021
Pressure Range	9 hPa		5 hPa	10 hPa, 2012	2 hPa, 2010

Observation	Detail
Sun Hours	6 hrs [40%]
Wet Hours	2 hrs
Cloud Cover	am: Overcast transitioned to Mostly Cloudy pm: Partly Cloudy transitioned to Sunny
Events	None
Comments	am Rn spell
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	5.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 21st June 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

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