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| Mullingar 1979–2008 averages
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| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max | 7.4 | 7.9 | 9.8 | 12.1 | 14.9 | 17.3 | 19.2 | 18.9 | 16.7 | 13.2 | 9.9 | 7.9 | 12.9 |
| mean daily min | 1.5 | 1.5 | 2.8 | 4.1 | 6.3 | 9.2 | 11.1 | 10.8 | 8.9 | 6.2 | 3.5 | 2.2 | 5.7 |
| mean temperature | 4.5 | 4.7 | 6.3 | 8.1 | 10.6 | 13.2 | 15.2 | 14.8 | 12.8 | 9.7 | 6.7 | 5.0 | 9.3 |
| absolute max. | 13.8 | 15.4 | 19.1 | 21.6 | 25.0 | 28.3 | 29.7 | 29.1 | 25.0 | 20.1 | 17.3 | 14.6 | 29.7 |
| min. maximum | -3.2 | -0.6 | 1.4 | 4.1 | 0.0 | 10.1 | 10.9 | 11.4 | 10.6 | 6.3 | 2.7 | -1.7 | -3.2 |
| max. minimum | 11.6 | 11.5 | 11.5 | 12.5 | 12.7 | 15.3 | 17.4 | 18.0 | 16.8 | 15.4 | 12.5 | 12.4 | 18.0 |
| absolute min. | -14.9 | -6.6 | -8.0 | -4.4 | -2.6 | 0.2 | 3.8 | 2.1 | 0.0 | -4.4 | -6.9 | -12.4 | -14.9 |
| mean num. of days with air frost | 9.9 | 8.9 | 5.5 | 3.1 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 5.4 | 8.2 | 43.0 |
| mean num. of days with ground frost | 17.9 | 16.2 | 14.0 | 10.8 | 5.1 | 0.8 | 0.0 | 0.1 | 1.7 | 6.3 | 12.1 | 15.4 | 100.4 |
| mean 5cm soil | 3.3 | 3.3 | 5.0 | 8.1 | 11.8 | 14.8 | 16.3 | 15.5 | 12.8 | 8.9 | 5.7 | 4.1 | 9.1 |
| mean 10cm soil | 3.7 | 3.7 | 5.1 | 7.6 | 11.0 | 14.1 | 15.8 | 15.2 | 12.8 | 9.3 | 6.2 | 4.5 | 9.1 |
| mean 20cm soil | 4.3 | 4.4 | 5.8 | 8.1 | 11.4 | 14.3 | 16.1 | 15.8 | 13.7 | 10.3 | 7.2 | 5.2 | 9.7 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 90.8 | 89.8 | 87.6 | 81.9 | 78.3 | 79.7 | 82.1 | 84.8 | 87.6 | 89.9 | 91.7 | 91.8 | 86.3 |
| mean at 1500UTC | 83.4 | 77.8 | 72.8 | 68.1 | 67.1 | 69.1 | 69.9 | 70.6 | 72.1 | 77.0 | 82.2 | 85.9 | 74.7 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.8 | 2.5 | 3.2 | 4.9 | 5.8 | 5.0 | 4.6 | 4.6 | 3.9 | 3.2 | 2.2 | 1.6 | 3.6 |
| greatest daily duration | 8.2 | 9.9 | 10.9 | 13.6 | 15.4 | 15.9 | 15.3 | 14.4 | 12.2 | 10.1 | 8.6 | 7.3 | 15.9 |
| mean num. of days with no sun | 10.3 | 7.2 | 5.3 | 2.9 | 1.9 | 2.2 | 1.8 | 1.9 | 3.3 | 5.7 | 8.4 | 11.0 | 62.0 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 91.7 | 72.0 | 78.3 | 62.1 | 68.7 | 70.5 | 61.8 | 80.8 | 73.8 | 102.1 | 82.4 | 97.1 | 941.3 |
| greatest daily total | 30.3 | 24.7 | 29.5 | 27.6 | 26.1 | 52.9 | 26.6 | 58.2 | 42.1 | 48.8 | 43.7 | 38.8 | 58.2 |
| mean num. of days with >= 0.2mm | 19 | 17 | 20 | 15 | 16 | 16 | 16 | 17 | 17 | 19 | 18 | 19 | 209 |
| mean num. of days with >= 1.0mm | 15 | 13 | 15 | 11 | 12 | 11 | 11 | 13 | 12 | 14 | 13 | 14 | 154 |
| mean num. of days with >= 5.0mm | 6 | 5 | 5 | 4 | 5 | 4 | 3 | 5 | 4 | 6 | 6 | 7 | 60 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 9.0 | 9.1 | 9.1 | 7.7 | 7.3 | 6.7 | 6.4 | 6.3 | 6.7 | 7.5 | 7.8 | 8.3 | 7.6 |
| max. gust | 67 | 71 | 59 | 56 | 58 | 48 | 48 | 50 | 51 | 59 | 62 | 73 | 58.5 |
| max. mean 10-minute speed | 38 | 36 | 36 | 30 | 34 | 26 | 27 | 28 | 32 | 36 | 32 | 39 | 32.8 |
| mean num. of days with gales | 0.3 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.2 | 0.8 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 5.0 | 4.4 | 3.5 | 1.6 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 2.7 | 17.8 |
| snow lying at 0900UTC | 2.7 | 0.9 | 0.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.0 | 5.7 |
| hail | 0.6 | 0.9 | 2.0 | 2.0 | 1.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.5 | 0.2 | 0.3 | 8.1 |
| thunder | 0.1 | 0.2 | 0.2 | 0.3 | 0.9 | 0.9 | 1.2 | 0.8 | 0.1 | 0.1 | 0.1 | 0.1 | 4.9 |
| fog | 3.4 | 3.0 | 2.4 | 2.0 | 1.8 | 1.3 | 1.9 | 2.9 | 4.0 | 4.1 | 4.1 | 4.3 | 35.1 |