Daily Report for 25th July 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	19.4 °C (+4.7)	02:01	14.8 °C (+0.7)	19.4 °C (+4.7), 2019	10.4 °C (-4.3), 2011
Maximum Temperature	36.8 °C (+13.5)	14:27	24.8 °C (+1.9)	36.8 °C (+13.5), 2019	20.2 °C (-3.1), 2023
Mean Temperature	28.4 °C (+9.1)		19.9 °C (+1.3)	28.4 °C, 2019	15.5 °C, 2015
Minimum Humidity	33%	14:40	48%	83%, 2024	32%, 2012
Maximum Humidity	78%	04:20	86%	95%, 2009	70%, 2011
Mean Humidity	54%		67%	90%, 2021	50%, 2012
Minimum Pressure	1009 hPa	18:35	1016 hPa	1019 hPa, 2025	1004 hPa, 2015
Maximum Pressure	1015 hPa	00:06	1021 hPa	1023 hPa, 2009	1011 hPa, 2021
Mean Pressure	1012 hPa		1019 hPa	1020 hPa, 2025	1009 hPa, 2020
Mean Wind Speed	3.5 mph (-0.8)		3.9 mph (-0.4)	6.8 mph, 2022	2.3 mph, 2018
Maximum Wind Speed	16.6 mph	20:21	11.5 mph	18.7 mph, 2020	8.1 mph, 2021
Maximum Gust	25.3 mph	20:20	18.3 mph	27.4 mph, 2016	10.7 mph, 2011
Mean Wind Direction	n/a		SSW	N, 2011	NNE, 2012
Rainfall	0.0 mm		25.0 mm (67%)	38.4 mm, 2021	0.0 mm, 2009
Maximum Hourly Rain	n/a		0.6 mm	25.5 mm, 2021	1.0 mm, 2024
Maximum 10-min Rain	n/a		0.2 mm	10.4 mm, 2021	0.3 mm, 2024
Maximum Rain Rate	n/a		1.9 mm/h	102 mm/h, 2014	1.4 mm/h, 2024
Minimum Dew Point	14.5 °C	00:48	10.7 °C	15.1 °C, 2021	4.3 °C, 2011
Maximum Dew Point	21.1 °C	13:44	15.6 °C	21.1 °C, 2019	11.0 °C, 2011
Mean Dew Point	17.4 °C		13.3 °C	17.4 °C, 2019	7.5 °C, 2011
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	19.4 °C	02:02	14.8 °C	19.4 °C, 2019	10.4 °C, 2011
Day Maximum (09-21)	36.8 °C	14:27	24.8 °C	36.8 °C, 2019	20.2 °C, 2023
Max 10m Temp Rise	0.6 °C	10:41	0.6 °C	1.1 °C, 2012	0.3 °C, 2024
Max 1hr Temp Rise	2.8 °C	08:48	2.2 °C	4.7 °C, 2012	1.3 °C, 2024
Max 1hr Hum Rise	13%	23:10	9%	28%, 2014	4%, 2025
Max 10m Temp Fall	0.7 °C	18:45	0.5 °C	2.6 °C, 2014	0.4 °C, 2010
Max 1hr Temp Fall	3.4 °C	23:11	1.8 °C	5.6 °C, 2014	1.2 °C, 2010
Max 1hr Hum Fall	16%	08:17	11%	20%, 2015	5%, 2021
Max 10m Wind Speed	10.9 mph	20:25	8.3 mph	12.7 mph, 2016	3.5 mph, 2009
Minimum Feels-like	23.1 °C	01:54	17.1 °C	23.1 °C, 2019	10.4 °C, 2011
Maximum Feels-like	44.6 °C	13:44	28.6 °C	44.6 °C, 2019	21.8 °C, 2023
Mean Feels-like	34.1 °C		23.0 °C	34.1 °C, 2019	16.1 °C, 2015
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	5.7 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	13.5 µg/m³, 2026	13.5 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	9.1 µg/m³, 2026	9.1 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	17.4 °C (+8.8)		10.0 °C	17.4 °C, 2019	4.4 °C, 2024
Humidity Range	45%		38%	52%, 2009	12%, 2024
Pressure Range	6 hPa		5 hPa	13 hPa, 2015	2 hPa, 2013

Observation	Detail
Sun Hours	9 hrs [63%]
Wet Hours	0.1 hrs
Cloud Cover	am: Sunny pm: Mostly Cloudy
Events	Light Thunderstorm
Comments	Thunderstorm but minimal rain if any
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	23.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 25th July 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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