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Otter Valley Weather Extremes (2005 - 2020)

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

Otter Valley weather extremes for 2020 and station records.

Previous extremes 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
    2020    Station Record
Temperature highs    31.3C 11th August   31.1C 20th June 2017
Temperature lows   -3.3C 20th January   -11.6C 26th December 2010
Temperature lowest high   7.4C 24th January   -1.4C 25th December 2010
Temperature highest low   17.4C 31st July   19.2C 1st July 2015
             
Warmest daily mean   24.1C 11th August   23.3C  19th July 2006
Coldest daily mean   3.0C 22nd January   -6.0C  19th December 2010
Warmest monthly mean   18.3C July   20.1C  July 2006
Coldest monthly mean   7.0C January   0.7C December 2010
Warmest annual mean   -.-C -   12.1C 2014
Coldest annual mean         10.0C 2010
             
Highest monthly anomaly   +2.7C February   +5.0C December 2015

Lowest monthly anomaly

  +0.5C March   -5.6C December 2010
             
Grass temp lows   -8.3C 3rd February   -10.8C 7th January 2010
             
Rainfall in 15 minutes   -.- mm -   10.4 mm 30th October 2008
Rainfall in 1 hour   -.- mm -   24.1 mm 12th June 2006
Rainfall in 24 hours   25.1 mm 15th February   70.8 mm 30th October 2008
Rainfall in 1 month   158.4 mm February   188.9 mm November 2009
Rainfall in 1 year   -.- mm 2019   1370 mm 2012
Highest Rainfall Rate   -.- mm/hr -.-   -.- -.-
             
Driest Month   10.7 mm May   0.0 mm June 2018
Driest Year   -.- mm -   712 mm 2011
             
Max Sunshine in 1 day   15.7 Hours 23rd June   15.8 hours 25th June 2010
Max Sunshine in 1 week   82.5 Hours 10th - 16th May   107.2 hours 24th to 30th June 2018
Max Sunshine in 1 month   357.8 Hours May   328.2 hours July 2013
Max Sunshine in 1 year   -.- Hours -   2019 hours 2010
Dullest month   79.0 Hours January   49.1 Hours  November 2015
Dullest Year   - -   1681 Hours  2011
             
UV Index high   10.0 7th July   10.0 14th July 2014
Solar irradiance high   1159 W/m 11th May   1320 W/m 4th May 2015
Solar irradiance 1-hour ave high   1153 W/m 17th June   1093 W/m 9th May 2019
Solar energy mean day high   31.28 MJ/m 1st June   33.1 MJ/m 19th June 2012
Solar energy mean day low   0.95 MJ/m 16th January   0.15 MJ/m 24th January 2014
             
Wind high   67 mph 14th January   74 mph 29th November 2018
Windiest day    500 miles 9th February   405 miles 6th February 2016
Windiest month   5495 miles February   6632 miles December 2015
Calmest day    17 miles 4th January   1 mile 11th December 2008
Calmest month   2217 miles April   1293 miles September 2014
             
Pressure highs   1050.1 hPa 20th January   1044.1 hPa 2nd January 2019
Pressure lows   983.6 hPa 29th February   961.1 hPa 10th March 2008
             
Dewpoint high   24.1C 11th August   21.8C 20th June 2017
Dewpoint low   -3.8C 20th January   -14.3C 26th December 2010
Relative humidity low   41% 14th May   27% 9th July 2013
             
Soil moisture deficit6   - cb -   78 cb 28th July 2018
10 cm soil temp highs5   19.6C 8th August   23.3C 23rd July 2018
10 cm soil temp lows   -.-C -   1.2C 1st March 2018
30 cm soil temp highs   18,3C 10th August   21.3C 27th July 2014
30 cm soil temp lows   -.-C -   2.8C 3rd March 2018
100 cm soil temp highs   16.5C 10th August   19.6C 30th July 2014
100 cm soil temp lows   -.-C -   4.0C 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
Most snow days in a year2   0 days So far    7 days 2010
             
Sea surface temp highs   -.-C -   22.1C 19th June 2017
Sea surface temp lows   7.7C 6th March   5.4C 27th December 2010
             
Least frost nights   - -   18 days 2014
Most frost nights   - days 2020   64 days 2010
Frostiest night3   -.- hours -   24 hours 25th December 2010
Frostiest month3   -.- hours -   373 hours December 2010
Thunder days in a month4   - Days -   6 days July 2014
Thunder days in a year4   - Days 2020   23 days 2014
 

Updated on the 11th August 2020.
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 0.0C. 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