Daily Report for 24th August 2018

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	9.8 °C (-3.9)	23:56	14.9 °C (+0.7)	19.9 °C (+6.2), 2022	7.3 °C (-6.4), 2014
Maximum Temperature	19.7 °C (-2.3)	14:46	24.5 °C (+1.8)	32.2 °C (+10.2), 2016	16.7 °C (-5.3), 2015
Mean Temperature	14.4 °C (-3.1)		19.7 °C (+1.2)	24.1 °C, 2016	14.0 °C, 2014
Minimum Humidity	41%	14:48	50%	79%, 2024	32%, 2016
Maximum Humidity	91%	23:05	89%	96%, 2013	81%, 2026
Mean Humidity	70%		71%	90%, 2013	60%, 2025
Minimum Pressure	1012 hPa	19:30	1015 hPa	1029 hPa, 2021	995 hPa, 2015
Maximum Pressure	1016 hPa	11:06	1020 hPa	1032 hPa, 2021	1005 hPa, 2015
Mean Pressure	1014 hPa		1018 hPa	1030 hPa, 2021	1000 hPa, 2015
Mean Wind Speed	6.4 mph (+2.4)		4.3 mph (+0.3)	8.4 mph, 2010	2.1 mph, 2019
Maximum Wind Speed	16.8 mph	16:47	12.4 mph	22.1 mph, 2010	8.8 mph, 2024
Maximum Gust	33.4 mph	17:33	20.2 mph	36.2 mph, 2010	12.3 mph, 2014
Mean Wind Direction	n/a		SW	N, 2015	NNE, 2016
Rainfall	5.3 mm		46.0 mm (110%)	19.2 mm, 2013	0.0 mm, 2009
Maximum Hourly Rain	3.5 mm	20:32	0.9 mm	9.2 mm, 2013	0.5 mm, 2011
Maximum 10-min Rain	1.3 mm	20:25	0.5 mm	6.7 mm, 2013	0.3 mm, 2011
Maximum Rain Rate	13 mm/h	16:49	10 mm/h	90 mm/h, 2013	0.9 mm/h, 2011
Minimum Dew Point	6.1 °C	14:48	11.6 °C	16.6 °C, 2022	4.4 °C, 2014
Maximum Dew Point	11.4 °C	17:13	16.3 °C	19.4 °C, 2022	9.1 °C, 2014
Mean Dew Point	8.7 °C		13.9 °C	18.1 °C, 2022	6.2 °C, 2014
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	11.2 °C	06:39	15.4 °C	19.9 °C, 2022	7.3 °C, 2014
Day Maximum (09-21)	19.7 °C	14:46	24.4 °C	32.2 °C, 2016	16.7 °C, 2015
Max 10m Temp Rise	0.7 °C	13:12	0.6 °C	1.0 °C, 2025	0.3 °C, 2013
Max 1hr Temp Rise	1.9 °C	07:58	2.4 °C	4.5 °C, 2025	1.0 °C, 2013
Max 1hr Hum Rise	32%	17:39	12%	32%, 2018	4%, 2013
Max 10m Temp Fall	2.5 °C	16:58	0.7 °C	2.5 °C, 2018	0.3 °C, 2013
Max 1hr Temp Fall	4.5 °C	17:25	2.2 °C	4.5 °C, 2018	1.2 °C, 2015
Max 1hr Hum Fall	11%	10:59	13%	24%, 2023	1%, 2015
Max 10m Wind Speed	12.2 mph	15:57	9.2 mph	14.9 mph, 2010	6.7 mph, 2023
Minimum Feels-like	7.3 °C	23:55	17.3 °C	25.4 °C, 2022	6.2 °C, 2014
Maximum Feels-like	19.7 °C	14:44	28.2 °C	35.8 °C, 2016	18.3 °C, 2014
Mean Feels-like	15.1 °C		23.1 °C	29.4 °C, 2022	14.0 °C, 2014
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	4.0 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	11.5 µg/m³, 2026	11.5 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	7.4 µg/m³, 2026	7.4 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	9.9 °C (+1.6)		9.6 °C	16.1 °C, 2019	4.0 °C, 2015
Humidity Range	50%		39%	59%, 2019	16%, 2015
Pressure Range	4 hPa		5 hPa	12 hPa, 2024	1 hPa, 2013

Observation	Detail
Sun Hours	6 hrs [47%]
Wet Hours	2 hrs
Cloud Cover	am: Sunny transitioned to Mostly Sunny pm: Mostly Cloudy
Events	Thunder
Comments	pm Thundery Shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	0.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 24th August 2018. 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