Casement 1971–2000 averages
TEMPERATURE (degrees Celsius)JanFebMarAprMayJunJulAugSepOctNovDecYear
mean daily max7.88.19.911.914.817.519.719.416.913.510.08.513.2
mean daily min2.02.23.13.86.29.011.310.99.16.93.92.95.9
mean temperature4.95.16.57.810.513.215.515.113.010.27.05.79.5
absolute max.15.415.918.121.324.727.629.830.525.421.317.715.430.5
min. maximum-3.0-0.70.74.37.19.210.611.710.46.82.1-1.1-3.0
max. minimum11.313.011.312.313.816.917.818.317.816.413.812.718.3
absolute min. -12.4-8.0-7.8-5.5-3.00.32.52.5-0.3-4.1-6.2-9.7-12.4
mean num. of days with air frost 7.76.24.73.90.80.00.00.00.01.25.06.235.8
mean num. of days with ground frost 15.013.012.012.05.01.00.00.01.04.010.012.085.0
mean 5cm soil3.63.34.57.311.314.916.415.212.49.25.54.59.0
mean 10cm soil3.93.54.67.010.714.115.714.812.29.35.84.78.8
mean 20cm soil4.54.25.37.410.714.115.815.213.010.26.75.39.4
RELATIVE HUMIDITY (%)
mean at 0900UTC86.685.683.980.277.177.979.281.384.186.087.687.383.1
mean at 1500UTC 81.777.171.868.067.568.168.268.771.476.481.083.473.6
SUNSHINE (hours)
mean daily duration 1.62.43.04.75.75.34.94.84.13.12.11.43.6
greatest daily duration 8.19.210.913.115.416.015.414.412.310.18.26.916.0
mean num. of days with no sun 10.06.54.62.41.91.91.51.62.74.47.310.555.4
RAINFALL (mm)
mean monthly total 67.849.751.751.555.958.548.165.963.169.466.276.0723.9
greatest daily total 30.023.026.538.729.897.544.789.351.140.282.046.897.5
mean num. of days with >= 0.2mm 181517141515141515161616186
mean num. of days with >= 1.0mm 13111110101091010121112129
mean num. of days with >= 5.0mm 43333324444542
WIND (knots)
mean monthly speed 14.113.212.810.09.18.88.98.910.011.312.313.611.1
max. gust 80787159635358556965688282
max. mean 10-minute speed 57544743433639364644495757
mean num. of days with gales 5.23.12.50.50.50.10.10.20.51.32.54.220.7
WEATHER (mean no. of days with..)
snow or sleet 4.63.73.01.30.20.00.00.00.00.00.42.015.1
snow lying at 0900UTC2.31.20.40.10.00.00.00.00.00.00.10.54.7
hail 0.81.22.72.31.40.50.10.10.30.10.70.610.8
thunder 0.00.10.20.41.00.90.80.90.40.20.10.15.0
fog2.21.71.52.41.61.21.22.42.92.31.82.223.3