PITSFORD HALL WEATHER STATION
NORTHAMPTON, UNITED KINGDOM

REVIEW OF JANUARY 2009

Air Temperatures
The Highest Maximum: 9.6 C on 22nd
The Lowest Maximum: 1.2 C on 4th
The Highest Minimum: 5.4 C on 17th
The Lowest Minimum: -5.5 C on 6th
The Mean Maximum: 5.8 C
The Mean Minimum: 0.1 C
The Overall Mean: 3.0 C
Difference from the Monthly Mean: -0.8 C

Black Bulb
Maximum (at 0900): 8.3 C on 22nd
Mean (at 0900): 2.3 C

Relative Humidity:
Highest Relative Humidity (at 0900): 100.0 % on 10th, 14th, 19th, 27th
Lowest Relative Humidity (at 0900): 74.3 % on 17th
Mean Relative Humidity (at 0900): 94.0 %

Dew Point:
The Highest Dew Point (0900): 8.3 C on 22nd
The Lowest Dew Point (at 0900): -6.0 C on 6th
The Mean Dew Point (at 0900): 1.5 C

Rainfall:
Total: 35.9 mm
Percentage of the Monthly Mean: 68.6 %
Duration: 35.2 hrs
Highest 24 hour fall (0900 to 0900): 5.7 mm on 27th
Rain Days (/=0.2mm): 14
Wet Days (/=1.0mm): 11

Sunshine:
Total Duration of Bright Sunshine: 41.0 hrs
Sunniest day: 6.2 hrs on 18th
No. of days without sunshine: 12
Percentage of the Monthly Mean: 92.3 %
Cloud cover (mean at 0900): 6.5 oktas (81.3 %)

Pressure (reduced to sea level):
The Highest Pressure (at 0900): 1031.8 mb on 1st & 2nd
The Lowest Pressure (at 0900): 972.3 mb on 23rd
Mean Pressure (at 0900): 1010.4 mb

Winds
Run of wind (mean over 24 hrs): 154.2 miles
Mean daily wind speed: 8.4 mph
Run of wind (cumulative): 4781.3 miles
Highest Maximum Gust: 49 mph on 17th
No. of gusts of 50mph or mo 0
Highest wind strength (at 0900): 25.4 mph on 11th
Mean wind strength (at 0900): 8.0 mph

Winds from the Following Directions:

N 2 NE 2 E 1 SE 4 S 11 SW 5 W 2 NW 2 Calm 2

Concrete
Lowest Concrete Minimum: -8.0 C on 8th
Mean Concrete Minimum: -2.2 C

Evaporation
Piche 32.3 ml
Pan Not available

Days with:
Thunder: 0
Hail 5mm: 0
Hail /=5mm: 0
Snow or snow & rain: 3
Snow lying: 3
Fog: 3
Air Frost: 15
Duration of Air Frost: 102 hrs
Gales: 0

All data © Pitsford Hall weather station.