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| Valentia 1961-1990 averages | | | | | | | | | | | | | |
| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max. | 9.3 | 9.3 | 10.5 | 12.2 | 14.3 | 16.4 | 17.9 | 18.0 | 16.6 | 14.3 | 11.4 | 10.1 | 13.4 |
| mean daily min. | 4.2 | 3.9 | 4.6 | 5.5 | 7.5 | 10.1 | 11.7 | 11.6 | 10.3 | 8.6 | 6.0 | 5.0 | 7.4 |
| mean | 6.8 | 6.6 | 7.6 | 8.9 | 10.9 | 13.3 | 14.8 | 14.8 | 13.5 | 11.5 | 8.7 | 7.6 | 10.4 |
| absolute max. | 13.6 | 15.1 | 20.3 | 24.0 | 26.9 | 25.7 | 29.7 | 28.4 | 25.9 | 22.5 | 19.8 | 15.3 | 29.7 |
| absolute min. | -5.9 | -7.3 | -5.1 | -1.6 | 0.5 | 2.8 | 5.3 | 3.3 | 2.8 | -1.4 | -4.0 | -5.3 | -7.3 |
| mean no. of days with air frost | 3.4 | 3.3 | 2.2 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.3 | 3.0 | 13.9 |
| mean no. of days with ground frost | 7.5 | 7.1 | 6.1 | 4.3 | 1.1 | 0.1 | 0.0 | 0.0 | 0.2 | 1.1 | 4.5 | 6.8 | 38.7 |
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| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 84 | 83 | 83 | 79 | 78 | 81 | 84 | 85 | 85 | 86 | 84 | 85 | 83 |
| mean at 1500UTC | 80 | 77 | 75 | 73 | 73 | 77 | 79 | 79 | 78 | 80 | 79 | 81 | 78 |
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| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.41 | 2.16 | 3.05 | 5.00 | 5.81 | 5.12 | 4.53 | 4.50 | 3.61 | 2.53 | 1.72 | 1.17 | 3.39 |
| greatest daily duration | 7.5 | 9.0 | 11.1 | 13.5 | 15.1 | 15.8 | 15.6 | 14.4 | 12.1 | 9.6 | 8.1 | 6.4 | 15.8 |
| mean no. of days with no sun | 11 | 7 | 6 | 3 | 2 | 4 | 4 | 4 | 4 | 7 | 9 | 13 | 75 |
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| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 166.6 | 123.0 | 122.9 | 76.2 | 89.6 | 79.2 | 74.0 | 110.8 | 123.8 | 156.4 | 148.3 | 159.2 | 1430.1 |
| greatest daily total | 45.6 | 46.2 | 37.1 | 52.7 | 37.5 | 58.3 | 32.4 | 85.6 | 55.6 | 64.6 | 86.6 | 62.0 | 86.6 |
| mean no. of days with >= 0.2mm | 23 | 19 | 21 | 17 | 18 | 17 | 17 | 19 | 19 | 22 | 22 | 24 | 239 |
| mean no. of days with >= 1.0mm | 20 | 16 | 16 | 12 | 14 | 13 | 12 | 15 | 15 | 19 | 18 | 19 | 187 |
| mean no. of days with >= 5.0mm | 11 | 8 | 8 | 5 | 7 | 5 | 5 | 7 | 8 | 11 | 10 | 10 | 95 |
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| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 13.1 | 12.6 | 12.1 | 10.1 | 10.3 | 9.1 | 8.5 | 8.9 | 10.0 | 11.4 | 11.8 | 12.6 | 10.9 |
| max. gust | 87 | 79 | 67 | 63 | 61 | 58 | 53 | 60 | 88 | 75 | 70 | 82 | 88 |
| max. mean 10-minute speed | 54 | 49 | 40 | 38 | 39 | 40 | 31 | 36 | 58 | 49 | 45 | 47 | 58 |
| mean no. of days with gales | 2.5 | 2.0 | 1.3 | 0.3 | 0.4 | 0.0 | 0.0 | 0.1 | 0.5 | 0.8 | 1.5 | 1.8 | 11.2 |
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| WEATHER (mean no. of days with...) | | | | | | | | | | | | | |
| snow or sleet | 1.5 | 1.7 | 1.1 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.8 | 5.6 |
| snow lying at 0900UTC | 0.2 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.8 |
| hail | 5.1 | 4.2 | 4.6 | 2.5 | 1.1 | 0.1 | 0.0 | 0.1 | 0.3 | 0.9 | 2.9 | 3.6 | 25.5 |
| thunder | 1.2 | 0.8 | 0.6 | 0.2 | 0.3 | 0.3 | 0.6 | 0.4 | 0.5 | 0.7 | 0.8 | 0.7 | 7.1 |
| fog | 0.4 | 0.4 | 0.2 | 0.9 | 0.9 | 1.2 | 1.5 | 1.2 | 0.7 | 0.6 | 0.4 | 0.4 | 8.9 |