Daily Report for 30th July 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	16.9 °C (+2.2)	23:52	15.1 °C (+0.9)	18.2 °C (+3.5), 2026	9.1 °C (-5.6), 2011
Maximum Temperature	20.4 °C (-2.9)	00:02	24.5 °C (+1.5)	31.0 °C (+7.7), 2024	17.8 °C (-5.5), 2021
Mean Temperature	18.4 °C (-0.3)		19.9 °C (+1.2)	23.4 °C, 2024	15.2 °C, 2015
Minimum Humidity	63%	00:06	50%	74%, 2021	31%, 2020
Maximum Humidity	90%	13:02	86%	95%, 2009	73%, 2014
Mean Humidity	80%		69%	85%, 2013	54%, 2020
Minimum Pressure	1004 hPa	14:46	1015 hPa	1019 hPa, 2025	999 hPa, 2021
Maximum Pressure	1008 hPa	23:58	1019 hPa	1025 hPa, 2011	1008 hPa, 2019
Mean Pressure	1006 hPa		1017 hPa	1022 hPa, 2011	1004 hPa, 2021
Mean Wind Speed	7.6 mph (+3.3)		4.1 mph (-0.2)	7.6 mph, 2019	1.0 mph, 2024
Maximum Wind Speed	19.9 mph	14:41	11.9 mph	19.9 mph, 2019	7.2 mph, 2024
Maximum Gust	36.9 mph	14:42	18.9 mph	36.9 mph, 2019	10.4 mph, 2024
Mean Wind Direction	n/a		SSW	NNW, 2025	NNE, 2011
Rainfall	5.5 mm		43.5 mm (98%)	17.8 mm, 2017	0.0 mm, 2011
Maximum Hourly Rain	1.5 mm	10:36	0.7 mm	16.0 mm, 2017	1.1 mm, 2009
Maximum 10-min Rain	0.9 mm	10:36	0.3 mm	5.1 mm, 2017	0.9 mm, 2009
Maximum Rain Rate	13 mm/h	10:31	2.7 mm/h	50 mm/h, 2017	7 mm/h, 2023
Minimum Dew Point	12.9 °C	00:12	11.1 °C	13.8 °C, 2024	2.5 °C, 2012
Maximum Dew Point	16.3 °C	16:00	15.7 °C	19.1 °C, 2024	8.9 °C, 2015
Mean Dew Point	14.8 °C		13.6 °C	16.4 °C, 2024	6.2 °C, 2012
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	18.2 °C	05:57	15.1 °C	18.2 °C, 2019	9.1 °C, 2011
Day Maximum (09-21)	20.2 °C	09:02	24.4 °C	31.0 °C, 2024	17.8 °C, 2021
Max 10m Temp Rise	0.5 °C	14:24	0.6 °C	1.0 °C, 2011	0.4 °C, 2016
Max 1hr Temp Rise	1.7 °C	14:27	2.2 °C	4.5 °C, 2011	1.4 °C, 2013
Max 1hr Hum Rise	14%	10:34	10%	19%, 2020	5%, 2013
Max 10m Temp Fall	0.7 °C	09:52	0.5 °C	0.8 °C, 2021	0.3 °C, 2010
Max 1hr Temp Fall	2.1 °C	10:32	1.8 °C	3.0 °C, 2020	1.2 °C, 2010
Max 1hr Hum Fall	8%	14:36	10%	17%, 2018	8%, 2013
Max 10m Wind Speed	12.9 mph	15:08	8.5 mph	15.9 mph, 2021	4.1 mph, 2024
Minimum Feels-like	20.5 °C	23:22	17.6 °C	21.5 °C, 2026	8.2 °C, 2011
Maximum Feels-like	24.0 °C	08:39	28.4 °C	37.5 °C, 2024	18.8 °C, 2015
Mean Feels-like	22.3 °C		23.1 °C	28.3 °C, 2024	15.4 °C, 2015
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	1.4 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	6.0 µg/m³, 2026	6.0 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	3.5 °C (-5.1)		9.4 °C	16.6 °C, 2020	3.1 °C, 2021
Humidity Range	27%		36%	56%, 2020	17%, 2021
Pressure Range	4 hPa		5 hPa	12 hPa, 2009	2 hPa, 2012

Observation	Detail
Sun Hours	3 hrs [21%]
Wet Hours	8 hrs
Cloud Cover	am: Mostly Sunny transitioned to Overcast pm: Overcast with periods of Mostly Cloudy
Events	None
Comments	09-21 persistent Rn spells
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	23.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 30th 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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