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
January
Headline:  Like December very cold with frequent snow showers during the first fortnight. Coldest January in Northampton since 1987.
February

Headline:  Again cold with below average temperatures, but essentially cyclonic with frequent outbreaks of rain, sleet and snow.

March

Headline: Settled first half under the influence of a fairly stationary high. Unsettled in the second half with frequent outbreaks of rain.

April

Headline: Very dry and sunny. Some very warm days followed by chilly nights.

May
Headline:   Cool for the first fortnight with a prevalence of northerly winds, then very warm.  Rainfall well below normal.
June

Headline:   Mostly dry, warm and sunny. Rainfall significantly below average, temperatures significantly above.

July

Headline:   Warm, but rarely hot.  Rainfall below average.  Sunshine significantly below average.

August
Headline:   The wettest August locally since 1917. Very changeable marked by a succession of Atlantic lows and trailing frontal waves.
September
Headline:   A changeable month, becoming particularly cold in the last week.
October

Headline:   Changeable. Wet to begin with and mild, but turning increasingly cold.

November

Headline:   Mild at the start and changeable, but turning increasingly cold and wintry.

December

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