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| Valentia 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 | 9.6 | 9.7 | 10.6 | 12.3 | 14.7 | 16.4 | 18.1 | 18.3 | 16.8 | 14.2 | 11.7 | 10.3 | 13.6 |
| mean daily min | 4.4 | 4.5 | 5.0 | 5.8 | 8.0 | 10.4 | 12.4 | 12.3 | 10.8 | 8.6 | 6.5 | 5.3 | 7.8 |
| mean temperature | 7.0 | 7.1 | 7.8 | 9.1 | 11.3 | 13.4 | 15.3 | 15.3 | 13.8 | 11.4 | 9.1 | 7.8 | 10.7 |
| absolute max. | 14.8 | 15.1 | 19.1 | 24.0 | 27.2 | 28.1 | 29.7 | 28.4 | 28.4 | 22.5 | 19.8 | 15.5 | 29.7 |
| min. maximum | -1.5 | 0.7 | 3.4 | 6.3 | 7.8 | 11.6 | 12.3 | 13.8 | 11.1 | 7.2 | 4.8 | -0.2 | -1.5 |
| max. minimum | 11.8 | 11.5 | 11.4 | 13.8 | 15.6 | 18.1 | 18.8 | 19.5 | 17.9 | 15.3 | 13.6 | 13.0 | 19.5 |
| absolute min. | -6.8 | -5.2 | -3.8 | -2.3 | 0.5 | 3.6 | 5.3 | 3.3 | 2.4 | -1.4 | -4.0 | -4.3 | -6.8 |
| mean num. of days with air frost | 2.9 | 2.8 | 1.6 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.2 | 2.6 | 11.7 |
| mean num. of days with ground frost | 7.0 | 6.0 | 5.5 | 4.3 | 1.4 | 0.1 | 0.0 | 0.0 | 0.3 | 1.4 | 4.1 | 6.2 | 36.3 |
| mean 5cm soil | 5.2 | 5.0 | 6.2 | 8.8 | 12.1 | 15.1 | 16.3 | 15.5 | 13.2 | 10.4 | 7.4 | 6.2 | 10.1 |
| mean 10cm soil | 5.6 | 5.4 | 6.5 | 8.5 | 11.4 | 14.4 | 15.8 | 15.2 | 13.3 | 10.7 | 7.8 | 6.6 | 10.1 |
| mean 20cm soil | 6.2 | 6.2 | 7.3 | 9.1 | 11.8 | 14.6 | 16.0 | 15.7 | 14.1 | 11.6 | 8.7 | 7.3 | 10.7 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 84.0 | 84.2 | 83.4 | 79.3 | 78.3 | 81.7 | 84.3 | 84.5 | 84.2 | 85.3 | 84.7 | 85.0 | 83.2 |
| mean at 1500UTC | 79.8 | 77.9 | 75.7 | 72.6 | 72.8 | 77.3 | 79.8 | 78.5 | 77.4 | 79.1 | 80.1 | 81.5 | 77.7 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.3 | 2.0 | 2.8 | 5.0 | 5.9 | 5.0 | 4.4 | 4.4 | 3.7 | 2.6 | 1.7 | 1.1 | 3.3 |
| greatest daily duration | 7.5 | 8.9 | 10.9 | 13.4 | 15.0 | 15.8 | 15.2 | 14.4 | 12.1 | 9.4 | 8.1 | 6.5 | 15.8 |
| mean num. of days with no sun | 11.7 | 8.0 | 7.4 | 3.4 | 2.6 | 4.0 | 4.1 | 3.1 | 3.9 | 7.1 | 8.9 | 12.2 | 76.4 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 170.8 | 130.3 | 126.5 | 81.7 | 84.1 | 83.0 | 87.4 | 113.8 | 127.2 | 170.0 | 162.1 | 171.0 | 1508.0 |
| greatest daily total | 48.5 | 47.6 | 48.6 | 51.0 | 38.2 | 37.8 | 45.5 | 88.8 | 94.3 | 74.4 | 112.5 | 69.9 | 112.5 |
| mean num. of days with >= 0.2mm | 23 | 20 | 21 | 16 | 17 | 17 | 18 | 18 | 19 | 22 | 22 | 23 | 236 |
| mean num. of days with >= 1.0mm | 19 | 16 | 17 | 12 | 12 | 12 | 12 | 14 | 15 | 18 | 19 | 19 | 185 |
| mean num. of days with >= 5.0mm | 11 | 9 | 9 | 5 | 5 | 5 | 5 | 7 | 7 | 11 | 10 | 11 | 95 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 12.7 | 12.4 | 11.6 | 9.8 | 9.4 | 8.8 | 8.2 | 8.2 | 9.4 | 10.8 | 11.4 | 12.2 | 10.4 |
| max. gust | 87 | 79 | 67 | 65 | 59 | 58 | 53 | 60 | 67 | 75 | 70 | 88 | 88 |
| max. mean 10-minute speed | 54 | 49 | 47 | 38 | 39 | 32 | 31 | 36 | 43 | 47 | 49 | 60 | 60 |
| mean num. of days with gales | 2.4 | 1.9 | 1.0 | 0.2 | 0.3 | 0.0 | 0.0 | 0.1 | 0.2 | 0.7 | 1.0 | 1.9 | 9.7 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 1.3 | 1.1 | 1.0 | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.5 | 4.3 |
| snow lying at 0900UTC | 0.3 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 |
| hail | 5.5 | 3.9 | 4.6 | 2.8 | 1.0 | 0.1 | 0.0 | 0.1 | 0.3 | 0.8 | 2.7 | 4.0 | 25.9 |
| thunder | 1.3 | 0.6 | 0.6 | 0.2 | 0.3 | 0.2 | 0.7 | 0.5 | 0.3 | 0.7 | 0.9 | 0.8 | 7.2 |
| fog | 0.5 | 0.3 | 0.4 | 0.9 | 1.1 | 1.4 | 1.5 | 1.1 | 0.6 | 0.6 | 0.5 | 0.4 | 9.3 |