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Otter Valley Weather Extremes (2005 - 2018)

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

Otter Valley weather extremes for 2018 and station records

Previous extremes 2009 2010 2011 2012 2013 2014 2015 2016 2017
    2018    Station Record
Temperature highs    31.1C 8th July   31.1C 20th June 2017
Temperature lows   -4.8C 28th February   -11.6C 26th December 2010
Temperature lowest high   -1.7C 1st March   -1.4C 25th December 2010
Temperature highest low   17.1C 4th August   19.2C 1st July 2015
             
Warmest daily mean   23.2C 2nd July   23.3C  19th July 2006
Coldest daily mean   -3.1C 1st March   -6.0C  19th December 2010
Warmest monthly mean   19.4C July   20.1C  July 2006
Coldest monthly mean   4.5C February   0.7C December 2010
Warmest annual mean   12.5C to the 13th October   12.1C 2014
Coldest annual mean         10.0C 2010
             
Highest monthly anomaly   +2.4C July   +5.0C December 2015

Lowest monthly anomaly

  -1.6C March   -5.6C December 2010
             
Grass temp lows   -8.3C 28th February   -10.8C 7th January 2010
             
Rainfall in 15 minutes   4.6 mm 9th August   10.4 mm 30th October 2008
Rainfall in 1 hour   10.4 mm 1st July   24.1 mm 12th June 2006
Rainfall in 24 hours   26.4 mm 12th August   70.8 mm 30th October 2008
Rainfall in 1 month   179.3 mm March   188.9 mm November 2009
Rainfall in 1 year   -.- mm -   1370 mm 2012
             
Driest Month   0.0 mm June   0.0 mm June 2018
Driest Year   -.- mm -   712 mm 2011
             
Max Sunshine in 1 day   15.4 Hours 24th June   15.8 hours 25th June 2010
Max Sunshine in 1 week   107.2 Hours 24th to 30th June   100.7 hours 5th to 11th July 2013
Max Sunshine in 1 month   285.2 Hours June   328.2 hours July 2013
Max Sunshine in 1 year   1740 Hours to the 13th October   2019 hours 2010
Dullest month   77.4 Hours January   49.1 Hours  November 2015
Dullest Year   - -   1681 Hours  2011
             
UV Index high   8.5 20th June   10.0 14th July 2014
Solar irradiance high   1134 W/m 20th June   1320 W/m 4th May 2015
Solar irradiance 1-hour ave high   1023 W/m 25th May   -.- W/m -.-
Solar energy mean day high   28.90 MJ/m 14th May   33.1 MJ/m 19th June 2012
Solar energy mean day low   1.09 MJ/m 13th January   0.15 MJ/m 24th January 2014
             
Wind high   52 mph 12th October   58 mph 10th March 2008
Windiest day    373 miles 12th October   405 miles 6th February 2016
Windiest month   2999 miles March   6632 miles December 2015
Calmest day    20 miles 30th August   1 mile 11th December 2008
Calmest month   1894 miles June   1293 miles September 2014
             
Pressure highs   1039.5 hPa 24th September   1043.9 hPa 27th December 2016
Pressure lows   981.9 hPa 5th March   961.1 hPa 10th March 2008
             
Dewpoint high   21.5C 3rd August   21.8C 20th June 2017
Dewpoint low   -12.8C 28th February   -14.3C 26th December 2010
Relative humidity low   33% 22nd June   27% 9th July 2013
             
Soil moisture deficit6   78 cb 28th July   78 cb 28th July 2018
10 cm soil temp highs5   23.3C 23rd July   23.3C 23rd July 2018
10 cm soil temp lows   1.2C 1st March   1.2C 1st March 2018
30 cm soil temp highs   21.1C 24th July   21.3C 27th July 2014
30 cm soil temp lows   2.8C 3rd March   2.8C 3rd March 2018
100 cm soil temp highs   18.3C 24th July   19.6C 30th July 2014
100 cm soil temp lows   6.1C 10th March   4.0C 10th January 2009
             
Highest snow depth   26 cm 19th March    28 cm 20th December 2010
Longest snow cover1   2 days 18th - 19th March    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   6 days up to May    7 days 2010
             
Sea surface temp highs   21.2C 29th June   22.1C 19th June 2017
Sea surface temp lows   6.1C 1st March   5.4C 27th December 2010
             
Least frost nights   - -   18 days 2014
Most frost nights   31 days up to July   64 days 2010
Frostiest night3   24 hours 1st March   24 hours 25th December 2010
Frostiest month3   113 hours February   373 hours December 2010
Thunder days in a month4   2 Days July   6 days July 2014
Thunder days in a year4   8 Days up to August   23 days 2014
 

Updated on the 13th October 2018.
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