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Daily Report for 13th August 2009

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MeasureValue (anomaly)TimeMonth cumul.Record HighRecord Low
Minimum Temperature15.9 °C (+1.6)06:5814.7 °C (+0.3)18.1 °C (+3.8), 202010.8 °C (-3.5), 2019
Maximum Temperature22.8 °C (+0.1)16:4822.6 °C (-0.5)35.8 °C (+13.1), 202618.1 °C (-4.6), 2010
Mean Temperature18.7 °C (+0.8)18.3 °C (-0.1)26.7 °C, 202614.3 °C, 2010
Minimum Humidity47%18:0057%69%, 201524%, 2026
Maximum Humidity93%07:0093%94%, 201870%, 2017
Mean Humidity73%77%87%, 201548%, 2026
Minimum Pressure1017 hPa04:491015 hPa1021 hPa, 20161004 hPa, 2014
Maximum Pressure1019 hPa16:581019 hPa1025 hPa, 20261008 hPa, 2014
Mean Pressure1018 hPa1017 hPa1022 hPa, 20261005 hPa, 2014
Mean Wind Speed2.6 mph (-1.4)3.4 mph (-0.6)7.4 mph, 20231.6 mph, 2017
Maximum Wind Speed6.9 mph8.6 mph20.7 mph, 20256.8 mph, 2017
Maximum Gust10.0 mph13:0213.9 mph29.0 mph, 201610.0 mph, 2009
Mean Wind Directionn/aSSWNNW, 2017NNE, 2020
Rainfall0.3 mm37.8 mm (167%)10.4 mm, 20150.0 mm, 2012
Maximum Hourly Rainn/a01:010.9 mm5.0 mm, 20150.2 mm, 2018
Maximum 10-min Rainn/a00:540.4 mm2.5 mm, 20100.2 mm, 2018
Maximum Rain Raten/a7 mm/h30 mm/h, 20100.6 mm/h, 2020
Minimum Dew Point9.5 °C19:5411.1 °C16.9 °C, 20204.5 °C, 2017
Maximum Dew Point16.8 °C01:0816.4 °C20.8 °C, 20209.6 °C, 2017
Mean Dew Point13.2 °C13.8 °C18.5 °C, 20206.9 °C, 2017
MeasureValueTimeMonth cumul.Record HighRecord Low
Night Minimum (21-09)15.9 °C14.8 °C20.1 °C, 202010.8 °C, 2019
Day Maximum (09-21)22.8 °C22.6 °C35.8 °C, 202618.1 °C, 2010
Max 10m Temp Rise1.0 °C16:130.5 °C1.0 °C, 20090.4 °C, 2015
Max 1hr Temp Rise1.3 °C14:031.5 °C4.1 °C, 20261.3 °C, 2009
Max 1hr Hum Rise10%23:537%18%, 20195%, 2016
Max 10m Temp Fall1.2 °C16:030.5 °C1.2 °C, 20090.3 °C, 2015
Max 1hr Temp Fall1.5 °C02:081.3 °C4.3 °C, 20261.0 °C, 2015
Max 1hr Hum Fall13%13:327%15%, 20136%, 2021
Max 10m Wind Speed5.0 mph16:146.0 mph12.5 mph, 20234.4 mph, 2017
Minimum Feels-like18.7 °C23:3315.8 °C23.3 °C, 202011.6 °C, 2019
Maximum Feels-like25.1 °C16:4824.7 °C38.9 °C, 202620.4 °C, 2013
Mean Feels-like21.7 °C20.1 °C29.7 °C, 202616.4 °C, 2013
Air-frost Hrs0 hrs0 hrs0 hrs, 20090 hrs, 2009
Minimum PM2.5n/a0.0 µg/m34.8 µg/m3, 20260.0 µg/m3, 2009
Maximum PM2.5n/a0.0 µg/m311.6 µg/m3, 202611.6 µg/m3, 2026
Mean PM2.5n/a0.0 µg/m36.8 µg/m3, 20266.8 µg/m3, 2026
MeasureValue (anomaly)Month cumul.Record HighRecord Low
Temperature Range6.9 °C (-1.5)7.9 °C19.4 °C, 20264.2 °C, 2015
Humidity Range46%36%58%, 202623%, 2025
Pressure Range2 hPa4 hPa12 hPa, 20151 hPa, 2010
ObservationDetail
Sun Hours6 hrs [45%]
Wet Hours2 hrs
Cloud Covernot available
EventsNone
CommentsSl/L 00-06 Rn/Drzl/Shwrs
Observer Absent?Yes - observations may be unreliable
Pond Temperature0.0 °C
Notes
Detailed daily weather report for Hampstead, NW3, London on 13th August 2009. 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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