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| Kilkenny 1978–2007 averages
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| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max | 8.2 | 8.6 | 10.6 | 12.9 | 15.7 | 18.2 | 20.3 | 20.2 | 17.8 | 14.1 | 10.8 | 8.8 | 13.8 |
| mean daily min | 1.6 | 1.9 | 3.2 | 4.2 | 6.5 | 9.3 | 11.3 | 11.0 | 9.1 | 6.5 | 3.7 | 2.4 | 5.9 |
| mean temperature | 4.9 | 5.2 | 6.9 | 8.5 | 11.1 | 13.8 | 15.8 | 15.6 | 13.4 | 10.3 | 7.3 | 5.6 | 9.9 |
| absolute max. | 14.1 | 15.6 | 19.2 | 22.4 | 26.0 | 29.6 | 31.4 | 30.8 | 26.6 | 21.4 | 17.5 | 15.5 | 31.4 |
| min. maximum | -3.3 | -0.3 | 1.6 | 5.0 | 7.5 | 11.5 | 12.3 | 12.2 | 9.6 | 6.4 | 2.1 | -1.9 | -3.3 |
| max. minimum | 11.4 | 11.9 | 11.8 | 12.3 | 14.5 | 17.0 | 17.6 | 18.1 | 16.9 | 15.5 | 13.3 | 12.9 | 18.1 |
| absolute min. | -14.1 | -8.5 | -7.9 | -4.0 | -3.0 | 1.0 | 3.6 | 2.2 | -0.9 | -4.8 | -7.0 | -8.8 | -14.1 |
| mean num. of days with air frost | 10.9 | 9.0 | 5.4 | 3.2 | 0.7 | 0.0 | 0.0 | 0.0 | 0.2 | 2.0 | 6.6 | 8.9 | 46.9 |
| mean num. of days with ground frost | 20.0 | 16.0 | 15.0 | 14.0 | 9.0 | 2.0 | 0.0 | 1.0 | 4.0 | 9.0 | 15.0 | 18.0 | 123.0 |
| mean 5cm soil | 3.6 | 3.7 | 5.5 | 8.5 | 12.8 | 16.0 | 17.5 | 16.4 | 13.3 | 9.3 | 6.1 | 4.4 | 9.8 |
| mean 10cm soil | 4.0 | 4.1 | 5.6 | 8.1 | 12.0 | 15.1 | 16.8 | 15.9 | 13.2 | 9.6 | 6.6 | 4.8 | 9.7 |
| mean 20cm soil | 4.6 | 4.9 | 6.4 | 8.8 | 12.2 | 15.2 | 17.0 | 16.5 | 14.2 | 10.8 | 7.6 | 5.6 | 10.3 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 88.4 | 87.7 | 84.8 | 79.0 | 75.8 | 76.7 | 78.1 | 80.9 | 84.8 | 88.5 | 90.1 | 89.6 | 83.7 |
| mean at 1500UTC | 79.5 | 74.3 | 69.2 | 63.6 | 63.4 | 65.9 | 65.2 | 65.1 | 67.5 | 74.2 | 78.9 | 81.8 | 70.7 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.8 | 2.3 | 3.2 | 4.9 | 5.6 | 4.9 | 4.7 | 4.7 | 4.0 | 3.0 | 2.2 | 1.6 | 3.6 |
| greatest daily duration | 8.4 | 9.8 | 11.6 | 13.7 | 15.5 | 16.3 | 15.4 | 14.5 | 11.8 | 10.2 | 8.7 | 7.2 | 16.3 |
| mean num. of days with no sun | 9.9 | 7.1 | 5.4 | 2.3 | 1.7 | 1.7 | 1.8 | 2.2 | 2.9 | 5.4 | 8.7 | 11.6 | 60.8 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 78.3 | 66.1 | 67.9 | 56.4 | 60.4 | 61.0 | 54.6 | 77.8 | 69.0 | 95.3 | 80.2 | 90.4 | 857.4 |
| greatest daily total | 25.2 | 24.8 | 27.9 | 23.4 | 31.1 | 28.2 | 66.4 | 58.3 | 34.7 | 33.6 | 34.2 | 43.8 | 66.4 |
| mean num. of days with >= 0.2mm | 18 | 16 | 18 | 14 | 16 | 14 | 14 | 15 | 15 | 18 | 17 | 18 | 193 |
| mean num. of days with >= 1.0mm | 13 | 12 | 12 | 10 | 11 | 10 | 9 | 10 | 10 | 13 | 12 | 13 | 135 |
| mean num. of days with >= 5.0mm | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 4 | 4 | 6 | 5 | 6 | 52 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 7.9 | 8.0 | 8.1 | 7.0 | 6.6 | 6.2 | 5.9 | 5.7 | 6.2 | 6.8 | 6.9 | 7.3 | 6.9 |
| max. gust | 68 | 72 | 62 | 56 | 54 | 44 | 48 | 50 | 54 | 57 | 56 | 75 | 58 |
| max. mean 10-minute speed | 44 | 39 | 43 | 34 | 32 | 27 | 29 | 29 | 30 | 38 | 36 | 47 | 35.7 |
| mean num. of days with gales | 0.5 | 0.4 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.6 | 1.9 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 3.6 | 3.6 | 2.5 | 0.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.0 | 12.8 |
| snow lying at 0900UTC | 1.5 | 1.1 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 3.2 |
| hail | 0.7 | 1.0 | 2.1 | 2.5 | 1.2 | 0.3 | 0.2 | 0.1 | 0.1 | 0.3 | 0.2 | 0.2 | 8.9 |
| thunder | 0.1 | 0.0 | 0.1 | 0.4 | 0.7 | 0.9 | 0.7 | 0.8 | 0.2 | 0.2 | 0.1 | 0.0 | 4.2 |
| fog | 3.2 | 2.8 | 1.7 | 1.9 | 1.9 | 1.3 | 1.7 | 2.9 | 3.8 | 3.8 | 3.2 | 3.8 | 32.1 |