WEATHER ANALYSES FOR 2011
Headline: The driest year since 1921 and with above average temperatures reversing the cooling trend observed since 2007.
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MONTHLY WEATHER REVIEWS AND CLIMATOLOGICAL SUMMARIES
Headline: An average January. Unsettled to begin with and then anticyclonic. Little snow.
Headline: A very mild winter month. Initially dry, but turning increasingly wet and dull.
Headline: A very dry month, the driest March locally since 1961.
Headline: Dry, sunny and very warm. The 23rd was the warmest April day on the local record.
Headline: Dry and warm with some very sunny days. Most of the month’s rain fell on one day (7th).
Headline: A succession of shallow depressions made for a month of sunny spells and scattered showers. Continued lack of substantial rain led to the county receiving official drought status on 10th.
Headline: The month was amongst the coolest July’s on record with rainfall about average.
Headline: A very warm start, but soon becoming rather cool and cloudy with frequent showers.
Headline: Changeable for the most part, but becoming progressively warmer towards the end of the month.
Headline: An exceptionally warm start and, other than some occasional outbreaks of rain, generally dry and sunny.
Headline: Exceptionally mild with rainfall again below average. Changeable in the final week with a brief wintry incursion.
Headline: The mildest December since 2006. Rainfall still below average despite rain being recorded on most days.
CLIMATOLOGICAL STATISTICS FOR 2011
Air Temperatures: The Highest Maximum: 29.4 C on 27th June The Lowest Maximum: 1.7 C on 28th January The Highest Minimum: 16.3 C on 10th September The Lowest Minimum: -4.4 C on 31st January The Mean Maximum: 15.1 C The Mean Minimum: 7.0 C The Overall Mean: 11.1 C Difference from the Yearly Mean: +1.2 C Solar Radiation: Maximum (at 0900): 806.0 W/m^2 on 9th June Mean (at 0900): 208.5 W/m^2 Relative Humidity: Highest Relative Humidity (at 0900): 100% on 11th January; 8th,11th,17th,22nd February; 15th,17th March; 23rd September; 2nd, 3rd, 4th, 9th, 10th, 13th, 19th, 22nd November Lowest Relative Humidity (at 0900): 44.5 % on 5th July Mean Relative Humidity (at 0900): 81.9 % Dew Point: The Highest Dew Point (0900): 22.7 C on 27th June The Lowest Dew Point (at 0900): -5.1 C on 31st January The Mean Dew Point (at 0900): 7.8 C Rainfall: Total: 399.5 mm Percentage of the Yearly Mean: 66.5 % Duration: 379.5 hrs Highest 24 hour fall (0900 to 0900): 23.0 mm on 7th May Rain Days (>/=0.2mm): 136 Wet Days (>/=1.0mm): 89 Sunshine: Total Duration of Bright Sunshine: 1354 hrs Sunniest day: 12.5 hrs on 8th April No. of days without sunshine: 65 Percentage of the Yearly Mean: 83.4 % Cloud cover (mean at 0900): 5.7 oktas Pressure (reduced to sea level): The Highest Pressure (at 0900): 1041.9 mb on 23rd March The Lowest Pressure (at 0900): 984.7 mb on 16th December Mean Pressure (at 0900): 1016.4 mb Winds Run of wind (mean over 24 hrs): 117.2 miles Mean daily wind speed: 6.4 mph Run of wind (cumulative): 42599 miles Highest Maximum Gust: 47 mph on 7th February No. of gusts of 50mph or more: 0 Highest wind strength (at 0900): 37 mph on 7th February Mean wind strength (at 0900): 9.9 mph
Winds from the Following Directions: N 22 NE 24 E 23 SE 41 S 91 SW 62 W 38 NW 55 Calm 8
Concrete Lowest Concrete Minimum: -5 C on 31st January Mean Concrete Minimum: 6.5 C Evaporation Piche 933.87 ml Days with: Thunder: 2 Hail <5mm: 0 Hail >/=5mm: 0 Snow or snow & rain: 3 Snow lying: 2 Fog: 15 Air Frost: 20 Duration of Air Frost: 169.8 hrs Gales: 0 Wettest month: 51.9 mm in February Driest month: 4.8 mm in March Warmest month: 16.3 C~ in August Coolest month: 4.0 C~ in January Sunniest month: 201.5 hrs in April Dullest month: 27.6 hrs in January Windiest month: 8.1 mph~ in February Calmest month: 4.5 mph~ in August ~ denotes an average calculated for that month. © Pitsford Hall weather station