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| Dublin Airport 1971–2000 averages
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| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max | 7.9 | 8.1 | 9.8 | 11.6 | 14.4 | 17.2 | 19.3 | 19.0 | 16.7 | 13.5 | 10.2 | 8.6 | 13.0 |
| mean daily min | 2.6 | 2.7 | 3.6 | 4.6 | 7.0 | 9.6 | 11.8 | 11.5 | 9.8 | 7.5 | 4.4 | 3.5 | 6.5 |
| mean temperature | 5.2 | 5.4 | 6.7 | 8.1 | 10.7 | 13.4 | 15.5 | 15.3 | 13.3 | 10.5 | 7.3 | 6.0 | 9.8 |
| absolute max. | 16.6 | 16.2 | 17.2 | 20.5 | 23.4 | 25.7 | 27.6 | 28.7 | 24.0 | 21.2 | 18.0 | 16.2 | 28.7 |
| min. maximum | -3.8 | 0.4 | 1.3 | 4.4 | 6.5 | 10.4 | 11.7 | 11.9 | 10.6 | 7.5 | 2.4 | -2.0 | -3.8 |
| max. minimum | 11.8 | 11.6 | 11.5 | 12.8 | 13.3 | 16.6 | 19.0 | 18.2 | 17.3 | 15.2 | 13.2 | 12.9 | 19.0 |
| absolute min. | -8.8 | -5.3 | -5.4 | -4.0 | -1.6 | 2.4 | 4.8 | 4.1 | 1.7 | -1.1 | -3.4 | -7.9 | -8.8 |
| mean num. of days with air frost | 6.3 | 4.5 | 2.8 | 1.7 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 3.2 | 4.6 | 23.7 |
| mean num. of days with ground frost | 15.3 | 13.4 | 12.2 | 9.7 | 3.7 | 0.2 | 0.0 | 0.0 | 0.6 | 3.4 | 10.0 | 13.1 | 81.7 |
| mean 5cm soil | 3.5 | 3.3 | 4.8 | 8.0 | 12.1 | 15.7 | 17.0 | 15.8 | 12.9 | 9.5 | 5.7 | 4.3 | 9.4 |
| mean 10cm soil | 3.8 | 3.7 | 5.0 | 7.7 | 11.3 | 14.8 | 16.3 | 15.4 | 12.8 | 9.7 | 6.1 | 4.7 | 9.3 |
| mean 20cm soil | 4.3 | 4.3 | 5.7 | 8.2 | 11.6 | 15.0 | 16.6 | 15.9 | 13.7 | 10.6 | 7.0 | 5.3 | 9.9 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 86.3 | 85.7 | 83.2 | 79.3 | 76.6 | 76.5 | 78.2 | 80.8 | 82.8 | 85.1 | 87.2 | 87.0 | 82.4 |
| mean at 1500UTC | 80.1 | 76.5 | 71.0 | 68.6 | 68.2 | 68.2 | 68.7 | 69.2 | 71.1 | 74.6 | 79.0 | 82.4 | 73.1 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.8 | 2.4 | 3.3 | 5.1 | 6.1 | 5.7 | 5.4 | 5.2 | 4.3 | 3.2 | 2.3 | 1.5 | 3.9 |
| greatest daily duration | 8.0 | 9.4 | 11.9 | 13.4 | 15.4 | 15.9 | 15.4 | 14.5 | 12.4 | 10.4 | 8.5 | 6.8 | 15.9 |
| mean num. of days with no sun | 10.4 | 7.6 | 5.4 | 2.7 | 2.1 | 1.8 | 1.5 | 1.8 | 3.0 | 5.3 | 8.0 | 11.3 | 60.9 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 68.1 | 51.4 | 53.6 | 52.2 | 53.0 | 60.4 | 49.8 | 69.0 | 63.5 | 71.7 | 65.2 | 76.7 | 734.7 |
| greatest daily total | 29.2 | 21.7 | 36.8 | 37.8 | 34.0 | 73.9 | 38.8 | 72.2 | 40.0 | 39.1 | 62.8 | 42.4 | 73.9 |
| mean num. of days with >= 0.2mm | 18 | 15 | 17 | 14 | 15 | 14 | 14 | 15 | 15 | 17 | 16 | 18 | 188 |
| mean num. of days with >= 1.0mm | 12 | 10 | 11 | 10 | 10 | 10 | 9 | 10 | 10 | 11 | 11 | 12 | 126 |
| mean num. of days with >= 5.0mm | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 43 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 12.4 | 11.9 | 11.6 | 9.7 | 8.7 | 8.2 | 8.3 | 8.1 | 9.0 | 10.1 | 10.8 | 11.8 | 10.0 |
| max. gust | 75 | 73 | 66 | 59 | 58 | 53 | 54 | 56 | 59 | 69 | 66 | 76 | 76 |
| max. mean 10-minute speed | 48 | 49 | 45 | 41 | 39 | 38 | 34 | 37 | 36 | 51 | 43 | 55 | 55 |
| mean num. of days with gales | 2.4 | 1.2 | 1.2 | 0.1 | 0.3 | 0.1 | 0.0 | 0.2 | 0.2 | 0.5 | 0.8 | 1.6 | 8.6 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 5.4 | 4.2 | 3.7 | 1.7 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 2.6 | 18.7 |
| snow lying at 0900UTC | 1.9 | 0.9 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.4 | 3.5 |
| hail | 0.8 | 0.9 | 2.0 | 2.2 | 1.5 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.3 | 0.6 | 9.1 |
| thunder | 0.1 | 0.1 | 0.2 | 0.3 | 0.7 | 0.8 | 0.7 | 0.8 | 0.3 | 0.3 | 0.2 | 0.1 | 4.6 |
| fog | 4.1 | 3.8 | 3.4 | 4.4 | 3.8 | 2.7 | 3.7 | 5.1 | 4.5 | 3.6 | 3.5 | 3.8 | 46.5 |