PITSFORD HALL WEATHER STATION NORTHAMPTON, UNITED KINGDOM MONTHLY WEATHER REPORT - JUNE 2003 Headline: Changeable but with above average temperatures and sunshine. Rainfall just short of the average, but with some particularly wet days marked by thundery downpours. The month began on a warm and sunny note, although becoming increasingly unsettled from the 4th as fronts and areas of low pressure moved across the county. Heavy and thundery showers which affected parts of Leicestershire were largely unrecorded in Pitsford. The 6th and 7th were particularly wet days (6.1mm and 9.4mm respectively), although some sunshine still managed to break through. The period from the 10th to the 16th was generally settled as an area of high pressure took charge. It became very warm and sunny. 13.7 hours of sunshine were recorded on 13th, the greatest daily amount for several years at Pitsford Hall, and by the 16th daytime maxima had risen to 26.8C. The settled spell was broken in many areas by heavy thunderstorms on the 17th and, although thunder was heard at Pistford, the day remained dry. Pressure continued to climb from the 18th culminating in a very warm and sunny day on the 20th. The 22nd saw low pressure working eastwards over northern Britain and this triggered some thundery downpours as the daytime maximum reached 28.9C at Pitsford (the highest June maximum recorded since 6th June 1996). 18.9mm of rain fell in the space of 7.3hrs. A quiet period then followed as a ridge of high pressure developed from Scandinavia. Winds were generally light and although coming from a cooler northerly direction, daytime maxima remained consistently in the low 20s with good spells of sunshine. The last few days of June were generally unsettled. The 27th saw some thunderstorms and the day remained cloudy. Conversely, the 28th and 29th saw some good sunshine amounts, although heavy downpours on the 29th accumulated 6.1mm in the space of 2 hours. Overall, this was the warmest June in Northampton since 1996. Air Temperatures The Highest Maximum: 28.9C on 22nd The Lowest Maximum: 17.6C on 30th The Highest Minimum: 15.4C on 23rd The Lowest Minimum: 7.1C on 21st The Mean Maximum: 22.2C The Mean Minimum: 11.2C The Overall Mean: 16.7C Difference from the Monthly Mean: 1.7C Relative Humidity: Highest Relative Humidity (at 0900): 98.9% on 7th Lowest Relative Humidity (at 0900): 54.6% on 3rd Mean Relative Humidity (at 0900): 74.5% Dew Point: The Highest Dew Point (at 0900): 15.4C on 30th The Lowest Dew Point (at 0900): 9.1C on 20th The Mean Dew Point (at 0900): 12.4C Rainfall: Total: 50.8mm Difference from the Monthly Mean: 89.0% Duration: 33.7hrs Highest 24 hour fall (from 0900): 18.9mm on 22nd Rain Days (>/=0.2mm): 12 Wet Days (>/=1.0mm): 8 Sunshine: Total Duration of Bright Sunshine: 209.1hrs Sunniest day: 13.7hrs on 13th Sunless days: 2 Cloud cover (mean at 0900): 6.4oktas (80%) Pressure (reduced to sea level): The Highest Pressure: 1023.1mb on 13th The Lowest Pressure: 1001.2mb on 30th Mean Pressure (recorded at 0900): 1014.1mb Winds Run of wind (mean over 24 hrs): 93.4miles Mean daily wind speed: 5.1mph Highest daily wind speed: 10.5mph on 10th Run of wind (to date): 2801.1miles Highest Maximum Gust: 33mph on 19th Highest wind strength (at 0900): 15.0mph on 9th Mean wind strength (at 0900): 5.4mph Winds from the Following Directions: N 1 NE 3 E 2 SE 4 S 8 SW 3 W 0 NW 4 Calm 5 Ground Temperatures: Lowest Grass Minimum: 4.8C on 13th Mean Grass Minimum: 9.6C Lowest Concrete Minimum: 8.4C on 13th Mean Concrete Minimum: 11.9C Lowest Bare Earth Minimum: 8.1C on 20th Mean Bare Earth Minimum: 11.6C Soil/Earth Temperatures: Surface mean: 19.3C 5cm mean: 17.4C 10cm mean: 17.8C 20cm mean: 17.6C 30cm mean: 17.8C 40cm mean: 17.6C 50cm mean: 17.6C 100cm mean: 15.1C Days with: Thunder: 3 Hail less than 0.5mm: 0 Hail greater than/equal to 0.5mm: 0 Snow or snow & rain: 0 Fog 0 Days with air frost: 0 Days with ground frost: 0 Total Evaporation (tank) 99.29mm