WEATHER ANALYSES FOR 2010
Headline: The coolest year locally since 1978 due largely to a bitterly cold December. Predominance of winds from the north-west.
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MONTHLY WEATHER REVIEWS AND CLIMATOLOGICAL SUMMARIES
JanuaryHeadline: Like December very cold with frequent snow showers during the first fortnight. Coldest January in Northampton since 1987.
Headline: Again cold with below average temperatures, but essentially cyclonic with frequent outbreaks of rain, sleet and snow.
Headline: Settled first half under the influence of a fairly stationary high. Unsettled in the second half with frequent outbreaks of rain.
Headline: Very dry and sunny. Some very warm days followed by chilly nights.
MayHeadline: Cool for the first fortnight with a prevalence of northerly winds, then very warm. Rainfall well below normal.
Headline: Mostly dry, warm and sunny. Rainfall significantly below average, temperatures significantly above.
Headline: Warm, but rarely hot. Rainfall below average. Sunshine significantly below average.
AugustHeadline: The wettest August locally since 1917. Very changeable marked by a succession of Atlantic lows and trailing frontal waves.
SeptemberHeadline: A changeable month, becoming particularly cold in the last week.
Headline: Changeable. Wet to begin with and mild, but turning increasingly cold.
Headline: Mild at the start and changeable, but turning increasingly cold and wintry.
Headline: Coldest December since records began in 1931. Frequent snowfall, but no significant accumulations until the 22nd.
CLIMATOLOGICAL STATISTICS FOR 2010
Air Temperatures The Highest Maximum: 28.3 C on 9th July The Lowest Maximum: -2.2 C on 20th & 25th December The Highest Minimum: 17.5 C on 21st August The Lowest Minimum: -9.4 C on 7th December The Mean Maximum: 13.0 C The Mean Minimum: 5.5 C The Overall Mean: 9.3 C Difference from the Yearly Mean: -0.6 C Solar Radiation Maximum (at 0900): 850.0 W/m^2 on 4th May Mean (at 0900): 208.2 W/m^2 Relative Humidity: Highest Relative Humidity (at 0900): 100% on 6th, 11th & 12th January; 5th, 6th, 14th, 17th-19th, 22nd & 28th February; 14th, 15th & 20th November; 4th, 5th, 8th, 28th-31st December Lowest Relative Humidity (at 0900): 45.7 % on 23rd April Mean Relative Humidity (at 0900): 84.5 % Dew Point: The Highest Dew Point (0900): 19.8 C on 20th July The Lowest Dew Point (at 0900): -10.2 C on 17th December The Mean Dew Point (at 0900): 6.4 C Rainfall: Total: 525.2 mm Percentage of the Yearly Mean: 87.4 % Duration: 534.8 hrs Highest 24 hour fall (0900 to 0900): 34.5 mm on 22nd August Rain Days (>/=0.2mm): 147 Wet Days (>/=1.0mm): 106 Sunshine: Total Duration of Bright Sunshine: 1287.3 hrs Sunniest day: 15.3 hrs on 3rd June No. of days without sunshine: 77 Percentage of the Yearly Mean: 79.3 % Cloud cover (mean at 0900): 5.7 oktas Pressure (reduced to sea level): The Highest Pressure (at 0900): 1041.7 mb on 26th January The Lowest Pressure (at 0900): 971.7 mb on 8th November Mean Pressure (at 0900): 1011.6 mb Winds Run of wind (mean over 24 hrs): 109 miles Mean daily wind speed: 5.8 mph Run of wind (cumulative): 39804 miles Highest Maximum Gust: 48 mph on 11th November No. of gusts of 50mph or more: 0 Highest wind strength (at 0900): 30 mph on 28th February Mean wind strength (at 0900): 8.3 mph Winds from the Following Directions: N 48 NE 36 E 22 SE 32 S 57 SW 48 W 36 NW 81 Calm 5 Concrete Lowest Concrete Minimum: -9.6 C on 7th December Mean Concrete Minimum: 5.1 C Evaporation Piche 762.8 ml Days with: Thunder: 5 Hail <5mm: 2 Hail >/=5mm: 0 Snow or snow & rain: 28 Snow lying: 39 Fog: 14 Air Frost: 69 Duration of Air Frost: 841.3 hrs Gales: 0 Wettest month: 141.5 mm in August Driest month: 12.4 mm in April Warmest month: 17.9 C~ in July Coolest month: -0.2 C~ in December Sunniest month: 204.1 hrs in June Dullest month: 27.0 hrs in December Windiest month: 7.4 mph~ in March Calmest month: 4.2 mph~ in June ~ denotes an average calculated for that month. © Pitsford Hall weather station