Daily Report for 17th August 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	15.5 °C (+1.4)	06:48	14.7 °C (+0.3)	18.1 °C (+4.0), 2012	10.8 °C (-3.3), 2018
Maximum Temperature	22.6 °C (+0.2)	16:29	22.7 °C (-0.3)	28.6 °C (+6.2), 2026	18.2 °C (-4.2), 2021
Mean Temperature	18.6 °C (+0.8)		18.5 °C (+0.0)	23.4 °C, 2026	15.4 °C, 2021
Minimum Humidity	53%	17:05	55%	76%, 2021	33%, 2012
Maximum Humidity	95%	03:02	90%	98%, 2020	63%, 2026
Mean Humidity	77%		75%	90%, 2022	53%, 2026
Minimum Pressure	1004 hPa	03:06	1009 hPa	1024 hPa, 2025	1004 hPa, 2019
Maximum Pressure	1006 hPa	21:40	1015 hPa	1028 hPa, 2025	1006 hPa, 2019
Mean Pressure	1005 hPa		1012 hPa	1026 hPa, 2025	1005 hPa, 2019
Mean Wind Speed	7.0 mph (+3.0)		5.7 mph (+1.7)	7.6 mph, 2014	1.1 mph, 2024
Maximum Wind Speed	15.9 mph	13:37	14.4 mph	17.6 mph, 2014	6.6 mph, 2024
Maximum Gust	24.2 mph	15:44	23.6 mph	26.8 mph, 2013	11.4 mph, 2024
Mean Wind Direction	n/a		SSW	N, 2015	NNE, 2011
Rainfall	0.2 mm		31.4 mm (106%)	35.8 mm, 2022	0.0 mm, 2009
Maximum Hourly Rain	0.2 mm		1.1 mm	23.1 mm, 2022	0.2 mm, 2013
Maximum 10-min Rain	0.2 mm		0.7 mm	9.9 mm, 2022	0.2 mm, 2013
Maximum Rain Rate	n/a		9 mm/h	90 mm/h, 2022	1.1 mm/h, 2011
Minimum Dew Point	12.1 °C	17:05	11.8 °C	15.4 °C, 2022	4.1 °C, 2014
Maximum Dew Point	16.4 °C	03:02	15.9 °C	19.2 °C, 2022	11.3 °C, 2015
Mean Dew Point	14.3 °C		13.8 °C	16.9 °C, 2022	8.0 °C, 2015
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.5 °C	06:48	14.9 °C	18.1 °C, 2012	10.8 °C, 2018
Day Maximum (09-21)	22.6 °C	16:29	22.7 °C	28.6 °C, 2026	18.2 °C, 2021
Max 10m Temp Rise	0.7 °C	12:32	0.6 °C	1.0 °C, 2009	0.3 °C, 2010
Max 1hr Temp Rise	2.0 °C	13:16	2.2 °C	3.2 °C, 2025	0.9 °C, 2010
Max 1hr Hum Rise	14%	18:06	12%	22%, 2022	3%, 2015
Max 10m Temp Fall	0.6 °C	14:34	0.7 °C	1.8 °C, 2022	0.3 °C, 2010
Max 1hr Temp Fall	1.3 °C	18:16	1.9 °C	5.0 °C, 2022	0.7 °C, 2021
Max 1hr Hum Fall	10%	13:38	11%	27%, 2014	4%, 2010
Max 10m Wind Speed	12.3 mph	13:09	10.8 mph	13.1 mph, 2014	4.4 mph, 2024
Minimum Feels-like	18.8 °C	06:48	17.1 °C	20.6 °C, 2012	11.8 °C, 2018
Maximum Feels-like	25.9 °C	14:13	26.2 °C	32.5 °C, 2026	20.6 °C, 2015
Mean Feels-like	22.2 °C		21.8 °C	26.4 °C, 2026	17.2 °C, 2015
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	1.2 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	11.9 µg/m³, 2026	11.9 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	4.0 µg/m³, 2026	4.0 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	7.1 °C (-1.2)		8.0 °C	14.1 °C, 2025	5.2 °C, 2010
Humidity Range	42%		35%	49%, 2016	13%, 2021
Pressure Range	3 hPa		6 hPa	10 hPa, 2013	2 hPa, 2011

Observation	Detail
Sun Hours	7.4 hrs [56%]
Wet Hours	1 hrs
Cloud Cover	am: Sunny transitioned to Partly Cloudy pm: Partly Cloudy
Events	None
Comments	o.night Rn
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	19.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 17th August 2019. 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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