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Otter Valley Weather Extremes (2005 - 2012)

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

Otter Valley weather extremes for 2012 and station records

Previous annual extremes 2009 2010 2011
    2012    Station Record
Temperature highs    28.5°C 25th July   30.8°C 19th July 2006
Temperature lows   -5.8°C 4th February   -9.8°C 26th December 2010
Temperature lowest high   1.9°C 8th February   -0.9°C 25th December 2010
Temperature highest low   18.6°C 15th August   18.6°C 15th August 2012
             
 Warmest monthly mean    17.3°C  August    20.1°C  July 2006
 Coldest monthly mean    6.0°C  February    0.7°C  December 2010
             
 Highest monthly anomaly    +2.2°C March    +4.5°C  April 2011
 Lowest monthly anomaly    -1.0°C  July    -5.6°C  December 2010
             
Grass temp lows   -8.3°C 4th February   -13.8°C 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   69.6 mm 25th November   70.8 mm 30th October 2008
Rainfall in 1 month   188.7 mm November   188.9 mm November 2009
Rainfall in 1 year   1370 mm Jan - Dec   1370 mm 2012
             
Driest Month   14.4 mm March   14.4 mm March 2012
Driest Year         712 mm 2011
             
Max Sunshine in 1 day   15.6 Hours 19th June   15.8 hours 25th June 2010
Max Sunshine in 1 month   229 Hours May   316.3 hours June 2010
Max Sunshine in 1 year   758 Hours up to 31st May   2019 hours 2010
Dullest month   88 Hours January    53.4 Hours  February 2011
             
UV Index high   8.9 2nd June   9.0 6th July 2011
Solar irradiance high   1247 W/m² 14th July   1247 W/m² 14th July 2012
Solar energy high   33.1 MJ/m² 19th June   33.1 MJ/m² 19th June 2012
             
Wind high   53 mph 22nd November   58 mph 10th March 2008
Windiest day   304 miles 22nd November   366 miles 21st March 2008
Windiest month   3006 miles June   4601 miles March 2008
Calmest day   5 miles 30th November   1 mile 11th December 2008
Calmest month   1501 miles September   1501 miles September 2012
             
Pressure highs   1042.0 hPa 8th February   1042.0 hPa 8th February 2012
Pressure lows   974.3 hPa 14th December   961.1 hPa 10th March 2008
             
Dewpoint high   20.9°C 19th August   20.9°C 19th August 2012
Dewpoint low   -8.0°C 4th February   -14.3°C 26th December 2010
Relative humidity low   29% 29th March   29% 21st March 2007
             
30 cm soil temp highs   - -   20.2°C 24th July 2009
30 cm soil temp lows   - -   0.3°C 8th January 2009
100 cm soil temp highs   - -   18.8°C 5th August 2011
100 cm soil temp lows   - -   4.0°C 10th January 2009
             
Highest snow depth   0 cm No snow falling    28 cm 20th December 2010
Longest snow cover1   0 days No snow falling    10 days 17th - 26th Dec 2010
Least snow days in a year2   0 days So far this year    0 days 2007 & 2011
Most snow days in a year2   0 days So far this year    4 days 2009 & 2010
             
Sea surface temp highs   19.9°C 9th August   22.5°C 10th August 2003
Sea surface temp lows   6.7°C 9th January   5.4°C 27th December 2010
             
Frostiest day3   17.5 hours 3rd February   24 hours 25th December 2010
Frostiest month3   107.8 hours February   373 hours December 2010
Thunder days in a month4   4 Days August   4 days July 2006
Thunder days in a year4   - -   16 days 2006
 

 

 

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.

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