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Otter Valley Weather Extremes (2005 - 2023)

My beautiful wife Cila, stood on Mushroom Rock, Dartmoor on a warm and humid September day with dramatic skies.

Otter Valley weather extremes for 2023 and station records.
Data will slowly populate through the year.

Previous extremes 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
2021 2022                    
    2023    Station Record
Temperature highs    31.3°C 13th June   34.0°C 11th August 2022
Temperature lows   -5.6°C 2nd December   -11.6°C 26th December 2010
Temperature lowest high   3.5°C 17th January   -1.4°C 25th December 2010
Temperature highest low   16.5°C 12th June   24.2°C 19th July 2022
             
Warmest daily mean   22.2°C 13th June   23.3°C  19th July 2006
Coldest daily mean   0.8°C 21st January   -6.0°C  19th December 2010
Warmest monthly mean   14.2°C May   20.1°C  July 2006
Coldest monthly mean   5.9°C January   0.7°C December 2010
Warmest annual mean   -.-°C -   12.1°C 2014
Coldest annual mean         10.0°C 2010
             
Highest monthly anomaly   +3.2°C June   +5.0°C December 2015

Lowest monthly anomaly

  -0.1°C July   -5.6°C December 2010
             
Grass temp lows   -6.2°C 2nd December   -10.8°C 7th January 2010
             
Rainfall in 15 minutes   5.6 mm 9th May   10.4 mm 30th October 2008
Rainfall in 1 hour   13.0 mm 9th May   24.1 mm 12th June 2006
Rainfall in 24 hours   30.8 mm 14th July   70.8 mm 30th October 2008
Rainfall in 1 month   122.4 mm July   193.1 mm October 2021
Rainfall in 1 year   965 mm 2023   1370 mm 2012
Highest Rainfall Rate   160 mm/hr 9th May   160 mm/hr 9th May 2023
             
Driest Month   7.2 mm February   0.0 mm June 2018
Driest Year   -.- mm -   694 mm 2022
             
Max Sunshine in 1 day   15.8 Hours 13th June   15.8 hours 25th June 2010
Max Sunshine in 1 week   101 Hours 1st - 7th June   107.2 hours 24th to 30th June 2018
Max Sunshine in 1 month   325 Hours June   357.8 hours May 2020
Max Sunshine in 1 year   1827 Hours 2023   2124 hours 2020
Dullest month   49.9 Hours December   47.7 Hours  December 2021
Dullest Year   - -   1681 Hours  2011
             
UV Index high   10.0 1st July   10.0 14th July 2014
Solar irradiance high   1243 W/m² 11th May   1320 W/m² 4th May 2015
Solar irradiance 1-hour ave high   -.- W/m² -   1093 W/m² 9th May 2019
Solar energy mean day high   -.- MJ/m² -   33.1 MJ/m² 19th June 2012
Solar energy mean day low   -.- MJ/m² -   0.15 MJ/m² 24th January 2014
             
Wind high   49 mph 13th March   74 mph 29th November 2018
Windiest day    344 miles 13th March   405 miles 6th February 2016
Windiest month   3541 miles December   6632 miles December 2015
Calmest day    6 miles 11th February   1 mile 11th December 2008
Calmest month   1732 miles February   1293 miles September 2014
             
Pressure highs   1047.2 hPa 5th February   1044.1 hPa 2nd January 2019
Pressure lows   977.7 hPa 9th March   961.1 hPa 10th March 2008
             
Dewpoint high   21.4°C 6th September   22.9°C 21st July 2021
Dewpoint low   -6.0°C 25th January   -14.3°C 26th December 2010
Relative humidity low   33% 13th June   27% 9th July 2013
             
Soil moisture deficit6   - cb -   78 cb 28th July 2018
10 cm soil temp highs5   -.-°C -   23.3°C 23rd July 2018
10 cm soil temp lows   6.3°C 25th January   1.2°C 1st March 2018
30 cm soil temp highs   -.-°C -   21.3°C 27th July 2014
30 cm soil temp lows   7.3°C 27th January   2.8°C 3rd March 2018
100 cm soil temp highs   -.-°C -   19.6°C 30th July 2014
100 cm soil temp lows   7.2°C 14th February   4.0°C 10th January 2009
             
Highest snow depth   0 cm -    28 cm 20th December 2010
Longest snow cover1   0 day -    10 days 17th - 26th Dec 2010
Least snow days in a year2   - -    0 days 2007,11,12,14,15
16, 17, 19, 20 & 21
Most snow days in a year2   0 days      7 days 2010
             
Sea surface temp highs   -.-°C -   22.1°C 19th June 2017
Sea surface temp lows   8.5°C 10th February   5.4°C 27th December 2010
             
Least frost nights   - -   18 days 2014
Most frost nights   13 days January   64 days 2010
Frostiest night3   17.3 hours 24th January   24 hours 25th December 2010
Frostiest month3   132 hours January   373 hours December 2010
Thunder days in a month4   2 Days May   6 days July 2014
Thunder days in a year4   - Days -   23 days 2014
 

Updated on the 1st January 2024.
This page is usually updated at the end of every month.

 

Most records go back to May 2005, which is when this station started recording weather for the Otter Valley. Sea surface temperature records are for Lyme Bay and date from early 2003. Sunshine recording was added late 2006 and started collecting data in 2007. Soil and grass temperature readings started in 2007. UV Index recording started in January 2011. 1Longest continuous snow cover of at least 50% of the ground. 2Snow days are defined as snow seen falling. 3Frostiest days are defined as the time duration with temperatures below 0.0°C. 4Thunder days are defined as days when thunder is heard. 5Soil temperatures at 10 cm depth begin from the start of 2018. 6Soil moisture deficit is measured at 30 cm depth and is in centibars (cb). Recording started September 2017. For a description on the measurement of soil moisture the click here.

Webcam Gallery World Weather Month So Far Year So Far Met Office 5 Day Sea Temp UV Light Recording Data Humidity Calcs