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Otter Valley Weather Extremes (2005 - 2026)

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

Otter Valley weather extremes for 2024 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   36.0°C 24th June 2026
Temperature lows   -11.6°C 26th December 2010
Temperature lowest high   -1.4°C 25th December 2010
Temperature highest low   24.2°C 19th July 2022
       
Warmest daily mean   26.8°C  24th June 2026
Coldest daily mean   -6.0°C  19th December 2010
Warmest monthly mean   20.1°C  July 2006
Coldest monthly mean   0.7°C December 2010
Warmest annual mean   12.1°C 2014
Coldest annual mean   10.0°C 2010
       
Highest monthly anomaly   +5.0°C December 2015

Lowest monthly anomaly

  -5.6°C December 2010
       
Grass temp lows   -10.8°C 7th January 2010
       
Rainfall in 15 minutes   10.4 mm 30th October 2008
Rainfall in 1 hour   24.1 mm 12th June 2006
Rainfall in 24 hours   70.8 mm 30th October 2008
Rainfall in 1 month   193.1 mm October 2021
Rainfall in 1 year   1370 mm 2012
Highest Rainfall Rate   160 mm/hr 9th May 2023
       
Driest Month   0.0 mm June 2018
Driest Year   694 mm 2022
       
Max Sunshine in 1 day   15.8 hours 25th June 2010
Max Sunshine in 1 week   107.2 hours 24th to 30th June 2018
Max Sunshine in 1 month   357.8 hours May 2020
Max Sunshine in 1 year   2124 hours 2020
Dullest month   47.7 Hours  December 2021
Dullest Year   1681 Hours  2011
       
UV Index high   10.0 14th July 2014
Solar irradiance high   1320 W/m² 4th May 2015
Solar irradiance 1-hour ave high   1093 W/m² 9th May 2019
Solar energy mean day high   33.1 MJ/m² 19th June 2012
Solar energy mean day low   0.15 MJ/m² 24th January 2014
       
Wind high   74 mph 29th November 2018
Windiest day   405 miles 6th February 2016
Windiest month   6632 miles December 2015
Calmest day   1 mile 11th December 2008
Calmest month   1293 miles September 2014
       
Pressure highs   1044.1 hPa 2nd January 2019
Pressure lows   961.1 hPa 10th March 2008
       
Dewpoint high   27.3°C 24th June 2026
Dewpoint low   -14.3°C 26th December 2010
Relative humidity low   27% 9th July 2013
       
Soil moisture deficit6   78 cb 28th July 2018
10 cm soil temp highs5   23.3°C 23rd July 2018
10 cm soil temp lows   1.2°C 1st March 2018
30 cm soil temp highs   21.3°C 27th July 2014
30 cm soil temp lows   2.8°C 3rd March 2018
100 cm soil temp highs   19.6°C 30th July 2014
100 cm soil temp lows   4.0°C 10th January 2009
       
Highest snow depth    28 cm 20th December 2010
Longest snow cover1    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    7 days 2010
       
Sea surface temp highs   24.6°C 24th June 2026
Sea surface temp lows   5.4°C 27th December 2010
       
Least frost nights   18 days 2014
Most frost nights   64 days 2010
Frostiest night3   24 hours 25th December 2010
Frostiest month3   373 hours December 2010
Thunder days in a month4   6 days July 2014
Thunder days in a year4   23 days 2014
 

Updated on the 19th July 2026.
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