Shannon Airport 1971–2000 averages
TEMPERATURE (degrees Celsius)JanFebMarAprMayJunJulAugSepOctNovDecYear
mean daily max8.69.010.712.915.717.919.819.617.414.010.99.213.8
mean daily min3.13.34.35.47.910.612.812.510.58.15.24.07.3
mean temperature5.96.27.59.211.814.316.316.114.011.18.16.610.6
absolute max.14.815.017.922.227.231.630.629.826.121.618.215.231.6
min. maximum-1.80.93.55.48.011.513.713.011.17.72.5-0.9-1.8
max. minimum11.811.711.312.815.317.819.419.317.816.313.312.919.4
absolute min. -8.2-5.5-3.9-2.20.33.46.15.72.5-2.0-4.8-5.8-8.2
mean num. of days with air frost 5.13.91.91.00.00.00.00.00.00.42.63.818.6
mean num. of days with ground frost 13.610.810.28.53.00.40.00.11.03.49.611.171.6
mean 5cm soil4.14.15.68.312.015.416.715.713.310.26.65.29.8
mean 10cm soil4.44.45.88.111.514.716.315.513.310.46.95.59.7
mean 20cm soil5.05.06.48.711.814.916.516.114.111.27.86.210.3
RELATIVE HUMIDITY (%)
mean at 0900UTC87.186.884.880.576.877.480.282.584.686.988.288.083.7
mean at 1500UTC 80.575.570.664.563.065.668.067.869.375.780.383.172.0
SUNSHINE (hours)
mean daily duration 1.62.23.04.85.74.94.34.43.82.71.91.33.4
greatest daily duration 8.19.610.813.515.315.815.714.811.69.78.37.115.8
mean num. of days with no sun 9.97.15.72.81.81.82.42.13.25.98.111.162.0
RAINFALL (mm)
mean monthly total 102.181.277.456.157.862.661.984.880.098.896.6105.4964.7
greatest daily total 31.329.428.128.925.040.641.646.030.232.839.541.246.0
mean num. of days with >= 0.2mm 201720151615151717201920211
mean num. of days with >= 1.0mm 161314111211111212161516159
mean num. of days with >= 5.0mm 76543435576762
WIND (knots)
mean monthly speed 10.610.710.49.18.98.78.58.18.79.59.410.09.4
max. gust 82806562595152556271668383
max. mean 10-minute speed 55464440393733344047415757
mean num. of days with gales 2.01.00.90.30.20.10.00.00.20.60.71.57.5
WEATHER (mean no. of days with..)
snow or sleet 3.02.71.80.60.00.00.00.00.00.00.21.39.6
snow lying at 0900UTC0.60.50.10.00.00.00.00.00.00.00.10.21.5
hail 3.93.64.32.31.50.20.10.20.40.81.72.921.8
thunder 0.90.40.40.40.40.60.80.50.30.40.50.66.1
fog3.11.71.92.11.61.41.72.93.13.03.63.629.8