Daily Report for 7th August 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	14.7 °C (+0.3)	06:00	15.4 °C (+0.9)	17.0 °C (+2.6), 2016	9.9 °C (-4.5), 2026
Maximum Temperature	23.1 °C (-0.0)	15:26	24.6 °C (+1.3)	35.1 °C (+12.0), 2020	19.0 °C (-4.1), 2009
Mean Temperature	18.7 °C (+0.1)		19.7 °C (+1.1)	25.1 °C, 2020	15.6 °C, 2011
Minimum Humidity	56%	12:42	52%	86%, 2009	26%, 2020
Maximum Humidity	89%	06:09	89%	98%, 2009	81%, 2025
Mean Humidity	73%		73%	95%, 2009	52%, 2026
Minimum Pressure	1006 hPa	04:53	1012 hPa	1025 hPa, 2022	996 hPa, 2021
Maximum Pressure	1010 hPa	23:51	1016 hPa	1029 hPa, 2022	1002 hPa, 2021
Mean Pressure	1007 hPa		1014 hPa	1027 hPa, 2022	999 hPa, 2021
Mean Wind Speed	6.8 mph (+2.8)		4.7 mph (+0.7)	11.9 mph, 2016	1.3 mph, 2015
Maximum Wind Speed	15.4 mph	12:32	12.0 mph	25.2 mph, 2016	6.4 mph, 2009
Maximum Gust	23.0 mph	12:15	18.9 mph	37.1 mph, 2016	8.7 mph, 2009
Mean Wind Direction	n/a		S	N, 2015	NE, 2013
Rainfall	1.1 mm		2.4 mm (20%)	9.8 mm, 2021	0.0 mm, 2013
Maximum Hourly Rain	1.1 mm	13:38	0.3 mm	4.8 mm, 2021	0.4 mm, 2018
Maximum 10-min Rain	0.4 mm	12:59	0.2 mm	2.7 mm, 2010	0.2 mm, 2018
Maximum Rain Rate	7 mm/h	12:59	2.2 mm/h	65 mm/h, 2010	1.0 mm/h, 2012
Minimum Dew Point	12.3 °C	20:32	12.8 °C	13.6 °C, 2010	5.9 °C, 2026
Maximum Dew Point	16.4 °C	16:14	16.5 °C	18.1 °C, 2016	10.5 °C, 2026
Mean Dew Point	13.6 °C		14.4 °C	15.7 °C, 2009	8.2 °C, 2026
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	14.7 °C	06:00	15.4 °C	18.0 °C, 2016	9.9 °C, 2026
Day Maximum (09-21)	23.1 °C	15:26	24.6 °C	35.1 °C, 2020	19.0 °C, 2009
Max 10m Temp Rise	0.9 °C	14:12	0.7 °C	1.2 °C, 2026	0.3 °C, 2009
Max 1hr Temp Rise	3.8 °C	14:42	2.5 °C	5.5 °C, 2026	1.0 °C, 2009
Max 1hr Hum Rise	27%	13:32	12%	27%, 2019	4%, 2009
Max 10m Temp Fall	2.0 °C	13:12	0.7 °C	2.0 °C, 2019	0.4 °C, 2009
Max 1hr Temp Fall	4.9 °C	13:40	2.0 °C	4.9 °C, 2019	1.2 °C, 2025
Max 1hr Hum Fall	20%	14:33	12%	20%, 2013	3%, 2009
Max 10m Wind Speed	12.5 mph	14:35	9.2 mph	19.2 mph, 2016	4.3 mph, 2009
Minimum Feels-like	17.3 °C	05:36	18.3 °C	19.9 °C, 2018	9.9 °C, 2026
Maximum Feels-like	27.0 °C	15:26	28.5 °C	38.8 °C, 2020	21.5 °C, 2011
Mean Feels-like	21.8 °C		23.3 °C	28.7 °C, 2020	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	2.4 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	6.9 µg/m³, 2026	6.9 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	3.5 µg/m³, 2026	3.5 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	8.4 °C (-0.3)		9.2 °C	20.5 °C, 2020	4.8 °C, 2009
Humidity Range	33%		37%	67%, 2020	12%, 2009
Pressure Range	4 hPa		4 hPa	7 hPa, 2012	2 hPa, 2011

Observation	Detail
Sun Hours	5 hrs [36%]
Wet Hours	1.5 hrs
Cloud Cover	am: Mostly Cloudy pm: Partly Cloudy
Events	None
Comments	pm Shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	20.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 7th 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

Full resolution images at up-to 5 minute intervals