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| Mullingar 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 | 7.2 | 7.7 | 9.6 | 11.8 | 14.7 | 17.2 | 19.2 | 18.9 | 16.5 | 13.0 | 9.6 | 7.8 | 12.8 |
| mean daily min | 1.4 | 1.5 | 2.7 | 3.8 | 6.1 | 8.8 | 11.0 | 10.5 | 8.6 | 6.2 | 3.1 | 2.2 | 5.5 |
| mean temperature | 4.3 | 4.6 | 6.1 | 7.8 | 10.4 | 13.0 | 15.1 | 14.7 | 12.5 | 9.6 | 6.3 | 5.0 | 9.1 |
| absolute max. | 13.8 | 15.4 | 16.8 | 22.6 | 25.0 | 28.8 | 29.7 | 28.9 | 25.0 | 21.6 | 17.3 | 14.6 | 29.7 |
| min. maximum | -3.2 | -0.6 | 1.4 | 4.1 | 0.0 | 9.0 | 10.9 | 11.4 | 9.1 | 6.3 | 1.2 | -3.3 | -3.3 |
| max. minimum | 11.6 | 11.5 | 11.1 | 12.5 | 12.7 | 15.8 | 17.4 | 18.0 | 16.8 | 15.4 | 12.5 | 12.4 | 18.0 |
| absolute min. | -14.9 | -6.7 | -6.0 | -4.2 | -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 | 10.0 | 8.2 | 5.8 | 3.2 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 6.7 | 8.3 | 44.3 |
| mean num. of days with ground frost | 17.7 | 15.1 | 13.6 | 10.8 | 5.0 | 0.8 | 0.0 | 0.1 | 1.7 | 5.9 | 13.1 | 15.1 | 99.0 |
| mean 5cm soil | 2.9 | 2.8 | 4.3 | 7.4 | 11.1 | 14.5 | 15.8 | 14.8 | 12.1 | 8.9 | 5.0 | 3.8 | 8.6 |
| mean 10cm soil | 3.2 | 3.1 | 4.4 | 6.9 | 10.3 | 13.7 | 15.2 | 14.4 | 12.0 | 9.1 | 5.5 | 4.2 | 8.5 |
| mean 20cm soil | 3.9 | 3.8 | 5.2 | 7.5 | 10.6 | 13.9 | 15.5 | 15.1 | 13.0 | 10.2 | 6.5 | 4.9 | 9.2 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 91.0 | 90.1 | 88.1 | 82.5 | 78.6 | 79.5 | 82.1 | 84.9 | 87.7 | 89.9 | 91.7 | 91.6 | 86.5 |
| mean at 1500UTC | 84.1 | 78.9 | 73.5 | 68.4 | 67.4 | 69.2 | 70.3 | 70.6 | 72.7 | 77.4 | 82.7 | 86.4 | 75.1 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.7 | 2.2 | 3.0 | 4.7 | 5.6 | 5.1 | 4.7 | 4.5 | 3.8 | 3.0 | 2.1 | 1.4 | 3.5 |
| greatest daily duration | 8.1 | 9.5 | 10.9 | 13.6 | 15.4 | 16.0 | 15.6 | 14.4 | 11.7 | 10.1 | 8.6 | 7.3 | 16.0 |
| mean num. of days with no sun | 11.3 | 7.9 | 5.4 | 2.9 | 2.2 | 1.9 | 2.0 | 2.2 | 3.7 | 5.8 | 8.8 | 11.9 | 66.1 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 87.2 | 68.6 | 70.6 | 57.8 | 58.9 | 63.5 | 58.8 | 75.5 | 79.4 | 93.6 | 81.7 | 90.8 | 886.4 |
| greatest daily total | 26.0 | 24.7 | 29.5 | 27.6 | 27.2 | 52.9 | 26.6 | 58.2 | 42.1 | 48.8 | 43.7 | 38.8 | 58.2 |
| mean num. of days with >= 0.2mm | 19 | 16 | 18 | 14 | 14 | 14 | 15 | 16 | 16 | 18 | 17 | 18 | 195 |
| mean num. of days with >= 1.0mm | 14 | 12 | 14 | 11 | 11 | 10 | 10 | 12 | 12 | 13 | 13 | 14 | 146 |
| mean num. of days with >= 5.0mm | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 5 | 5 | 6 | 6 | 6 | 59 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 9.7 | 9.7 | 9.7 | 8.1 | 7.6 | 7.1 | 6.9 | 6.7 | 7.2 | 8.0 | 8.3 | 9.0 | 8.2 |
| max. gust | 76 | 71 | 60 | 56 | 58 | 52 | 48 | 50 | 51 | 59 | 62 | 73 | 76 |
| max. mean 10-minute speed | 45 | 36 | 39 | 34 | 36 | 26 | 27 | 28 | 32 | 36 | 32 | 39 | 45 |
| mean num. of days with gales | 0.5 | 0.3 | 0.2 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.2 | 1.4 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 5.9 | 4.8 | 3.8 | 2.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 3.1 | 20.5 |
| snow lying at 0900UTC | 2.9 | 1.2 | 0.7 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.0 | 6.1 |
| hail | 0.6 | 0.8 | 2.6 | 1.9 | 1.5 | 0.4 | 0.0 | 0.2 | 0.2 | 0.5 | 0.5 | 0.3 | 9.5 |
| thunder | 0.1 | 0.1 | 0.3 | 0.2 | 0.8 | 0.9 | 1.3 | 0.7 | 0.1 | 0.2 | 0.2 | 0.1 | 4.9 |
| fog | 4.7 | 3.9 | 2.8 | 2.7 | 2.4 | 1.8 | 2.4 | 4.6 | 4.9 | 4.6 | 5.3 | 5.2 | 45.3 |