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| Belmullet 1981–2010 averages
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| TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| mean daily max | 8.9 | 9.1 | 10.4 | 12.2 | 14.6 | 16.2 | 17.6 | 17.8 | 16.5 | 13.7 | 11.0 | 9.2 | 13.1 |
| mean daily min | 3.7 | 3.6 | 4.7 | 5.8 | 7.9 | 10.4 | 12.2 | 12.2 | 10.7 | 8.4 | 6.0 | 4.2 | 7.5 |
| mean temperature | 6.3 | 6.4 | 7.6 | 9.0 | 11.2 | 13.3 | 14.9 | 15.0 | 13.6 | 11.1 | 8.5 | 6.7 | 10.3 |
| absolute max. | 13.9 | 15.1 | 19.5 | 24.4 | 26.6 | 27.0 | 29.9 | 27.7 | 25.4 | 20.1 | 16.3 | 14.9 | 29.9 |
| min. maximum | -1.1 | 0.7 | 3.1 | 6.3 | 8.0 | 11.3 | 12.5 | 12.1 | 11.6 | 7.4 | 3.4 | 0.9 | -1.1 |
| max. minimum | 10.7 | 11.0 | 11.0 | 12.0 | 15.3 | 16.5 | 17.5 | 17.6 | 16.8 | 15.5 | 13.9 | 12.3 | 17.6 |
| absolute min. | -8.1 | -5.4 | -5.7 | -2.1 | 0.2 | 1.4 | 5.1 | 3.1 | 0.8 | -1.7 | -4.5 | -7.6 | -8.1 |
| mean num. of days with air frost | 4.0 | 3.8 | 1.2 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.1 | 3.5 | 14.1 |
| mean num. of days with ground frost | 10.6 | 10.0 | 6.5 | 5.4 | 1.7 | 0.1 | 0.0 | 0.0 | 0.4 | 2.0 | 5.6 | 10.0 | 52.3 |
| mean 5cm soil | 4.9 | 4.9 | 6.4 | 9.3 | 12.9 | 15.6 | 16.8 | 16.1 | 13.6 | 10.2 | 7.4 | 5.4 | 10.3 |
| mean 10cm soil | 5.3 | 5.3 | 6.6 | 9.0 | 12.3 | 14.9 | 16.2 | 15.8 | 13.7 | 10.7 | 7.9 | 5.9 | 10.3 |
| mean 20cm soil | 5.8 | 6.0 | 7.2 | 9.6 | 12.8 | 15.3 | 16.6 | 16.5 | 14.5 | 11.5 | 8.7 | 6.5 | 10.9 |
| RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
| mean at 0900UTC | 86.0 | 85.8 | 84.1 | 81.1 | 78.7 | 81.4 | 84.9 | 85.1 | 84.5 | 85.7 | 86.1 | 86.8 | 84.2 |
| mean at 1500UTC | 81.7 | 79.1 | 77.5 | 73.7 | 73.3 | 77.2 | 79.7 | 79.2 | 77.9 | 80.0 | 82.3 | 84.3 | 78.8 |
| SUNSHINE (hours) | | | | | | | | | | | | | |
| mean daily duration | 1.4 | 2.3 | 3.1 | 5.2 | 6.1 | 5.2 | 4.4 | 4.4 | 4.0 | 2.8 | 1.6 | 1.2 | 3.5 |
| greatest daily duration | 8.3 | 9.6 | 11.6 | 14.1 | 15.5 | 15.9 | 15.1 | 13.9 | 12.1 | 10.4 | 8.2 | 7.2 | 15.9 |
| mean num. of days with no sun | 10.3 | 6.0 | 5.9 | 2.7 | 2.0 | 2.8 | 3.5 | 3.2 | 3.7 | 5.5 | 8.3 | 10.8 | 64.8 |
| RAINFALL (mm) | | | | | | | | | | | | | |
| mean monthly total | 134.0 | 97.1 | 99.2 | 72.0 | 70.4 | 72.1 | 79.0 | 101.9 | 101.8 | 145.9 | 134.0 | 137.4 | 1244.8 |
| greatest daily total | 44.7 | 31.3 | 25.6 | 25.9 | 42.2 | 38.9 | 33.2 | 49.5 | 62.6 | 79.6 | 43.0 | 41.7 | 79.6 |
| mean num. of days with >= 0.2mm | 23 | 20 | 22 | 18 | 17 | 17 | 20 | 20 | 20 | 23 | 23 | 23 | 246 |
| mean num. of days with >= 1.0mm | 19 | 16 | 17 | 13 | 13 | 12 | 14 | 15 | 15 | 19 | 20 | 19 | 192 |
| mean num. of days with >= 5.0mm | 10 | 7 | 7 | 4 | 4 | 4 | 5 | 6 | 6 | 10 | 10 | 9 | 82 |
| WIND (knots) | | | | | | | | | | | | | |
| mean monthly speed | 15.4 | 14.6 | 14.0 | 12.2 | 11.6 | 11.4 | 11.1 | 11.2 | 12.0 | 13.3 | 13.3 | 13.8 | 12.8 |
| max. gust | 94 | 93 | 88 | 75 | 66 | 63 | 67 | 56 | 73 | 73 | 80 | 93 | 94 |
| max. mean 10-minute speed | 55 | 60 | 58 | 43 | 42 | 45 | 45 | 40 | 50 | 52 | 47 | 59 | 60 |
| mean num. of days with gales | 7.0 | 4.8 | 3.1 | 1.4 | 0.9 | 0.2 | 0.2 | 0.4 | 1.5 | 2.6 | 3.1 | 4.4 | 29.6 |
| WEATHER (mean no. of days with..) | | | | | | | | | | | | | |
| snow or sleet | 4.5 | 4.2 | 3.1 | 1.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.9 | 3.0 | 17.3 |
| snow lying at 0900UTC | 0.4 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.8 | 1.6 |
| hail | 9.2 | 7.8 | 7.4 | 4.4 | 1.7 | 0.1 | 0.0 | 0.1 | 0.5 | 3.3 | 5.6 | 7.5 | 47.7 |
| thunder | 1.1 | 0.7 | 0.6 | 0.4 | 0.5 | 0.5 | 0.6 | 0.6 | 0.3 | 0.6 | 0.5 | 0.9 | 7.2 |
| fog | 1.0 | 0.4 | 0.9 | 1.4 | 1.4 | 1.7 | 2.9 | 1.9 | 1.2 | 0.7 | 0.9 | 0.7 | 15.1 |