Daily Report for 18th July 2020

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.9 °C (+1.4)	05:19	13.3 °C (-0.7)	18.9 °C (+4.4), 2025	11.2 °C (-3.3), 2010
Maximum Temperature	25.4 °C (+2.1)	16:58	21.5 °C (-1.4)	36.8 °C (+13.5), 2022	18.4 °C (-4.9), 2011
Mean Temperature	20.1 °C (+1.8)		17.4 °C (-1.0)	27.2 °C, 2022	15.1 °C, 2011
Minimum Humidity	45%	17:09	56%	71%, 2012	22%, 2016
Maximum Humidity	82%	05:16	89%	96%, 2024	70%, 2013
Mean Humidity	67%		73%	85%, 2012	48%, 2022
Minimum Pressure	1017 hPa	17:46	1015 hPa	1025 hPa, 2013	995 hPa, 2011
Maximum Pressure	1021 hPa	00:09	1021 hPa	1028 hPa, 2021	1000 hPa, 2011
Mean Pressure	1019 hPa		1018 hPa	1026 hPa, 2021	998 hPa, 2011
Mean Wind Speed	4.7 mph (+0.4)		5.1 mph (+0.8)	8.5 mph, 2009	1.1 mph, 2021
Maximum Wind Speed	12.3 mph	12:06	13.8 mph	19.3 mph, 2017	6.9 mph, 2018
Maximum Gust	18.4 mph	12:06	21.4 mph	31.0 mph, 2009	11.4 mph, 2021
Mean Wind Direction	n/a		W	WNW, 2016	N, 2021
Rainfall	0.0 mm		26.9 mm (101%)	11.7 mm, 2014	0.0 mm, 2010
Maximum Hourly Rain	n/a		0.5 mm	6.0 mm, 2014	0.2 mm, 2023
Maximum 10-min Rain	n/a		0.3 mm	4.5 mm, 2014	0.2 mm, 2023
Maximum Rain Rate	n/a		4.8 mm/h	72 mm/h, 2014	3.2 mm/h, 2012
Minimum Dew Point	12.4 °C	17:09	9.9 °C	13.2 °C, 2025	4.1 °C, 2010
Maximum Dew Point	15.3 °C	14:41	14.4 °C	20.8 °C, 2021	11.0 °C, 2015
Mean Dew Point	13.6 °C		12.2 °C	17.2 °C, 2021	7.9 °C, 2015
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.9 °C	05:21	13.6 °C	18.9 °C, 2025	11.2 °C, 2010
Day Maximum (09-21)	25.4 °C	16:59	21.5 °C	36.8 °C, 2022	18.2 °C, 2012
Max 10m Temp Rise	0.6 °C	11:17	0.6 °C	1.2 °C, 2009	0.5 °C, 2011
Max 1hr Temp Rise	2.3 °C	12:07	2.2 °C	4.6 °C, 2022	1.5 °C, 2019
Max 1hr Hum Rise	12%	20:29	10%	19%, 2009	6%, 2019
Max 10m Temp Fall	0.5 °C	17:13	0.6 °C	1.8 °C, 2009	0.4 °C, 2012
Max 1hr Temp Fall	2.3 °C	20:45	2.1 °C	4.6 °C, 2022	1.3 °C, 2019
Max 1hr Hum Fall	10%	12:13	11%	24%, 2022	9%, 2026
Max 10m Wind Speed	8.7 mph	12:19	10.2 mph	11.4 mph, 2011	4.2 mph, 2009
Minimum Feels-like	18.6 °C	05:09	14.7 °C	23.6 °C, 2025	11.2 °C, 2010
Maximum Feels-like	28.5 °C	16:54	24.3 °C	40.0 °C, 2022	20.6 °C, 2011
Mean Feels-like	23.3 °C		19.9 °C	30.2 °C, 2022	17.1 °C, 2011
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	4.1 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	35.5 µg/m³, 2026	35.5 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	20.9 µg/m³, 2026	20.9 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	9.5 °C (+0.8)		8.2 °C	21.4 °C, 2022	4.0 °C, 2012
Humidity Range	37%		33%	65%, 2014	21%, 2012
Pressure Range	4 hPa		5 hPa	12 hPa, 2012	2 hPa, 2018

Observation	Detail
Sun Hours	8 hrs [55%]
Wet Hours	0 hrs
Cloud Cover	am: Overcast transitioned to Sunny pm: Sunny transitioned to Partly Cloudy
Events	None
Comments	-
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	5.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 18th July 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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