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| Shannon Aiport 1981–2010 averages
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| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max | 8.8 | 9.2 | 11.1 | 13.3 | 16.0 | 18.3 | 19.8 | 19.6 | 17.7 | 14.3 | 11.1 | 9.0 | 14.0 |
| mean daily min | 3.2 | 3.2 | 4.5 | 5.7 | 8.2 | 10.9 | 12.9 | 12.7 | 10.8 | 8.2 | 5.5 | 3.6 | 7.4 |
| mean temperature | 6.0 | 6.2 | 7.8 | 9.5 | 12.1 | 14.6 | 16.4 | 16.2 | 14.2 | 11.2 | 8.3 | 6.3 | 10.7 |
| absolute max. | 14.8 | 15.5 | 18.3 | 23.5 | 27.2 | 30.2 | 30.6 | 29.8 | 26.1 | 22.3 | 17.6 | 15.3 | 30.6 |
| min. maximum | -2.4 | 0.9 | 3.5 | 5.4 | 8.0 | 11.8 | 13.8 | 13.0 | 11.1 | 7.0 | 0.8 | -6.0 | -6.0 |
| max. minimum | 11.8 | 12.3 | 11.7 | 13.0 | 15.3 | 17.8 | 19.4 | 19.3 | 17.8 | 16.3 | 13.4 | 12.9 | 19.4 |
| absolute min. | -11.2 | -5.5 | -5.8 | -2.3 | 0.2 | 3.6 | 6.7 | 4.4 | 1.7 | -2.0 | -6.6 | -11.4 | -11.4 |
| mean num. of days with air frost | 5.3 | 5.1 | 2.1 | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 2.3 | 4.8 | 20.8 |
| mean num. of days with ground frost | 13.7 | 12.6 | 11.0 | 8.3 | 3.3 | 0.3 | 0.0 | 0.1 | 1.2 | 3.8 | 9.5 | 12.5 | 76.3 |
| mean 5cm soil | 4.5 | 4.6 | 6.3 | 8.9 | 12.7 | 15.9 | 17.2 | 16.4 | 13.8 | 10.2 | 7.1 | 5.2 | 10.2 |
| mean 10cm soil | 4.8 | 4.8 | 6.3 | 8.5 | 12.1 | 15.1 | 16.6 | 16.1 | 13.6 | 10.3 | 7.4 | 5.5 | 10.1 |
| mean 20cm soil | 5.5 | 5.6 | 7.0 | 9.2 | 12.3 | 15.1 | 16.8 | 16.6 | 14.5 | 11.4 | 8.4 | 6.3 | 10.7 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 87.1 | 87.0 | 85.0 | 79.8 | 76.3 | 76.8 | 80.0 | 82.1 | 84.7 | 87.0 | 88.9 | 88.4 | 83.6 |
| mean at 1500UTC | 80.5 | 74.6 | 70.5 | 64.4 | 63.3 | 65.1 | 68.0 | 68.2 | 69.2 | 75.2 | 80.5 | 83.1 | 71.9 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.6 | 2.3 | 3.2 | 5.1 | 5.8 | 5.2 | 4.5 | 4.5 | 3.9 | 2.9 | 2.0 | 1.4 | 3.5 |
| greatest daily duration | 8.1 | 10.2 | 11.0 | 13.6 | 15.6 | 15.8 | 15.7 | 14.4 | 12.2 | 10.1 | 8.3 | 7.1 | 15.8 |
| mean no. of days with no sun | 9.2 | 6.4 | 5.7 | 2.4 | 1.9 | 2.0 | 2.4 | 2.3 | 2.9 | 5.5 | 7.8 | 11.1 | 59.8 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 102.3 | 76.2 | 78.7 | 59.2 | 64.8 | 69.8 | 65.9 | 82.0 | 75.6 | 104.9 | 94.1 | 104.0 | 977.6 |
| greatest daily total | 38.2 | 29.4 | 28.1 | 40.2 | 25.0 | 40.6 | 39.5 | 51.0 | 52.3 | 36.9 | 26.9 | 41.2 | 52.3 |
| mean num. of days with >= 0.2mm | 20 | 16 | 19 | 16 | 16 | 15 | 16 | 18 | 16 | 20 | 20 | 19 | 211 |
| mean num. of days with >= 1.0mm | 16 | 12 | 14 | 11 | 12 | 11 | 12 | 13 | 12 | 16 | 15 | 15 | 159 |
| mean num. of days with >= 5.0mm | 8 | 5 | 5 | 4 | 4 | 4 | 4 | 5 | 4 | 7 | 6 | 7 | 63 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 10.3 | 10.2 | 10.0 | 9.0 | 8.9 | 8.5 | 8.5 | 8.2 | 8.4 | 9.2 | 9.1 | 9.4 | 9.1 |
| max. gust | 75 | 80 | 65 | 62 | 59 | 51 | 52 | 55 | 62 | 71 | 66 | 83 | 83 |
| max. mean 10-minute speed | 52 | 46 | 44 | 40 | 37 | 37 | 38 | 35 | 40 | 47 | 41 | 57 | 57 |
| mean num. of days with gales | 1.7 | 0.9 | 0.8 | 0.3 | 0.2 | 0.1 | 0.0 | 0.1 | 0.1 | 0.6 | 0.7 | 1.2 | 6.7 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 2.3 | 2.3 | 1.4 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.3 | 8.0 |
| snow lying at 0900UTC | 0.6 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.9 |
| hail | 3.6 | 3.3 | 3.4 | 2.2 | 1.2 | 0.1 | 0.1 | 0.1 | 0.3 | 0.9 | 1.1 | 2.4 | 18.6 |
| thunder | 0.9 | 0.5 | 0.4 | 0.3 | 0.5 | 0.5 | 0.8 | 0.4 | 0.2 | 0.4 | 0.4 | 0.5 | 5.7 |
| fog | 3.3 | 2.0 | 2.1 | 1.9 | 1.5 | 1.4 | 1.4 | 2.0 | 2.9 | 2.9 | 3.9 | 4.2 | 29.6 |