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Otter Valley Weather Extremes (2005 - 2017)

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

Otter Valley weather extremes for 2017 and station records

Previous extremes 2009 2010 2011 2012 2013 2014 2015 2016
    2017    Station Record
Temperature highs    31.1C 20th June   31.1C 20th June 2017
Temperature lows   -4.1C 3rd January   -11.6C 26th December 2010
Temperature lowest high   3.3C 11th February   -0.9C 25th December 2010
Temperature highest low   18.4C 19th July   19.2C 1st July 2015
             
Warmest daily mean   23.0C 20th June   23.3C  19th July 2006
Coldest daily mean   0.9C 11th February   -6.0C  19th December 2010
Warmest monthly mean   18.0C July   20.1C  July 2006
Coldest monthly mean   6.1C January   0.7C December 2010
Warmest annual mean   12.7C so far   12.1C 2014
Coldest annual mean         10.0C 2010
             
Highest monthly anomaly   +2.3C March   +5.0C December 2015

Lowest monthly anomaly

  +0.0C January   -5.6C December 2010
             
Grass temp lows   -6.9C 3rd January   -10.8C 7th January 2010
             
Rainfall in 15 minutes   3.8 mm 8th September   10.4 mm 30th October 2008
Rainfall in 1 hour   8.8 mm 1st May   24.1 mm 12th June 2006
Rainfall in 24 hours   34.0 mm 1st May   70.8 mm 30th October 2008
Rainfall in 1 month   88.2 mm August   188.9 mm November 2009
Rainfall in 1 year   --- mm ---   1370 mm 2012
             
Driest Month   21.4 mm April   5.9 mm July 2016
Driest Year   - -   712 mm 2011
             
Max Sunshine in 1 day   15.6 Hours 18th June   15.8 hours 25th June 2010
Max Sunshine in 1 month   210.9 Hours June   328.2 hours July 2013
Max Sunshine in 1 year   --- Hours ---   2019 hours 2010
Dullest month   80.6 Hours February   49.1 Hours  November 2015
Dullest Year   - -   1681 Hours  2011
             
UV Index high   9.1 8th July   10.0 14th July 2014
Solar irradiance high   1282 W/m 7th June   1320 W/m 4th May 2015
Solar irradiance 1-hour ave high   1066 W/m 25th June   -.- W/m -.-
Solar energy daily high   30.44 MJ/m 18th June   33.1 MJ/m 19th June 2012
Solar energy daily low   0.84 MJ/m 31st January   -.- MJ/m -.-
             
Wind high   41 mph 2nd February   58 mph 10th March 2008
Windiest day    369 miles 2nd February   405 miles 6th February 2016
Windiest month   3693 miles March   6632 miles December 2015
Calmest day    6 miles 8th January   1 mile 11th December 2008
Calmest month   2191 miles April   1293 miles September 2014
             
Pressure highs   1038.5 hPa 18th January   1043.9 hPa 27th December 2016
Pressure lows   984.5 hPa 28th February   961.1 hPa 10th March 2008
             
Dewpoint high   21.8C 20th June   21.8C 20th June 2017
Dewpoint low   -5.3C 3rd January   -14.3C 26th December 2010
Relative humidity low   47% 17th June   27% 9th July 2013
             
30 cm soil temp highs   21.3C 10th July   21.3C 27th July 2014
30 cm soil temp lows   6.9C 11th February   0.3C 8th January 2009
100 cm soil temp highs   19.5C 13th July   19.6C 30th July 2014
100 cm soil temp lows   10.0C 14th February   4.0C 10th January 2009
             
Highest snow depth   0 cm No snow lying    28 cm 20th December 2010
Longest snow cover1   0 days No snow lying    10 days 17th - 26th Dec 2010
Least snow days in a year2   1 day 11th February    0 days 2007,11,12,14,15 & 16
Most snow days in a year2   0 days No snow falling    4 days 2009 & 2010
             
Sea surface temp highs   22.1C 19th June   22.1C 19th June 2017
Sea surface temp lows   7.8C 13th February   5.4C 27th December 2010
             
Least frost days   - -   18 days 2014
Most frost days   13 days so far   64 days 2010
Frostiest day3   13.3 hours 23rd January   24 hours 25th December 2010
Frostiest month3   58.8 hours January   373 hours December 2010
Thunder days in a month4   3 Days May   6 days July 2014
Thunder days in a year4   10 Days so far   23 days 2014
 

Updated on the 14th October 2017.
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.

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