Daily Report for 14th July 2021

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	14.1 °C (-0.2)	03:51	14.1 °C (+0.4)	17.6 °C (+3.3), 2025	11.7 °C (-2.6), 2011
Maximum Temperature	24.6 °C (+1.5)	17:40	21.7 °C (-1.1)	29.3 °C (+6.2), 2026	16.9 °C (-6.2), 2012
Mean Temperature	19.0 °C (+0.6)		17.6 °C (-0.4)	23.2 °C, 2013	14.6 °C, 2012
Minimum Humidity	61%	17:31	64%	73%, 2023	34%, 2011
Maximum Humidity	91%	04:01	92%	95%, 2018	72%, 2011
Mean Humidity	77%		80%	88%, 2012	56%, 2011
Minimum Pressure	1018 hPa	03:29	1012 hPa	1023 hPa, 2019	999 hPa, 2012
Maximum Pressure	1021 hPa	23:42	1017 hPa	1026 hPa, 2022	1007 hPa, 2010
Mean Pressure	1019 hPa		1014 hPa	1024 hPa, 2019	1004 hPa, 2010
Mean Wind Speed	4.0 mph (-0.3)		3.1 mph (-1.2)	7.9 mph, 2025	1.4 mph, 2024
Maximum Wind Speed	11.1 mph	12:42	10.7 mph	18.2 mph, 2025	7.8 mph, 2013
Maximum Gust	17.1 mph	17:08	15.5 mph	27.0 mph, 2009	10.2 mph, 2013
Mean Wind Direction	n/a		SW	NNW, 2021	N, 2022
Rainfall	0.0 mm		60.0 mm (289%)	7.2 mm, 2023	0.0 mm, 2011
Maximum Hourly Rain	0.0 mm	21:04	1.9 mm	2.9 mm, 2019	0.0 mm, 2021
Maximum 10-min Rain	n/a	18:46	0.6 mm	2.0 mm, 2012	0.3 mm, 2015
Maximum Rain Rate	n/a	20:14	9 mm/h	30 mm/h, 2012	0.4 mm/h, 2015
Minimum Dew Point	12.4 °C	03:03	11.9 °C	14.3 °C, 2015	5.3 °C, 2011
Maximum Dew Point	17.4 °C	14:17	15.7 °C	18.4 °C, 2026	10.0 °C, 2011
Mean Dew Point	14.8 °C		13.9 °C	15.2 °C, 2015	7.5 °C, 2011
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	14.1 °C	03:50	14.2 °C	18.7 °C, 2025	11.7 °C, 2011
Day Maximum (09-21)	24.6 °C	17:41	21.7 °C	29.3 °C, 2026	15.7 °C, 2012
Max 10m Temp Rise	0.7 °C	14:24	0.6 °C	0.8 °C, 2026	0.3 °C, 2023
Max 1hr Temp Rise	1.8 °C	11:37	2.1 °C	2.9 °C, 2018	1.0 °C, 2023
Max 1hr Hum Rise	5%	01:01	10%	13%, 2023	5%, 2020
Max 10m Temp Fall	0.5 °C	18:02	0.6 °C	0.7 °C, 2016	0.4 °C, 2014
Max 1hr Temp Fall	1.7 °C	18:45	2.0 °C	2.8 °C, 2016	1.1 °C, 2023
Max 1hr Hum Fall	7%	11:41	10%	15%, 2026	7%, 2015
Max 10m Wind Speed	7.6 mph	15:32	7.6 mph	13.9 mph, 2025	5.4 mph, 2013
Minimum Feels-like	16.6 °C	03:47	16.6 °C	20.4 °C, 2015	11.7 °C, 2011
Maximum Feels-like	30.1 °C	17:46	25.8 °C	34.9 °C, 2026	19.6 °C, 2012
Mean Feels-like	22.9 °C		20.9 °C	26.3 °C, 2013	16.8 °C, 2016
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	5.0 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	15.0 µg/m³, 2026	15.0 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	10.3 µg/m³, 2026	10.3 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	10.5 °C (+1.7)		7.6 °C	13.0 °C, 2018	3.1 °C, 2023
Humidity Range	30%		28%	53%, 2018	21%, 2015
Pressure Range	4 hPa		5 hPa	16 hPa, 2023	1 hPa, 2009

Observation	Detail
Sun Hours	6 hrs [41%]
Wet Hours	0 hrs
Cloud Cover	am: Mostly Cloudy pm: Partly Cloudy transitioned to Mostly Sunny
Events	None
Comments	-
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	21.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 14th July 2021. 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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