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Clones 1961-1990 averages | | | | | | | | | | | | | |
TEMPERATURE (degrees Celsius) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
mean daily max. | 6.7 | 7.1 | 9.2 | 11.6 | 14.5 | 17.2 | 18.6 | 18.3 | 16.0 | 13.1 | 8.9 | 7.4 | 12.4 |
mean daily min. | 1.3 | 1.3 | 2.1 | 3.4 | 5.7 | 8.6 | 10.4 | 10.1 | 8.3 | 6.5 | 2.9 | 2.2 | 5.2 |
mean | 4.0 | 4.2 | 5.7 | 7.5 | 10.1 | 12.9 | 14.5 | 14.2 | 12.1 | 9.8 | 5.9 | 4.8 | 8.8 |
absolute max. | 13.1 | 14.0 | 20.6 | 21.9 | 25.4 | 28.1 | 30.5 | 27.5 | 23.5 | 22.1 | 16.2 | 14.8 | 30.5 |
absolute min. | -12.4 | -9.0 | -9.8 | -4.2 | -3.7 | 0.5 | 4.1 | 1.5 | -0.2 | -3.0 | -6.6 | -10.4 | -12.4 |
mean no. of days with air frost | 10.4 | 9.2 | 6.8 | 3.3 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 6.5 | 8.6 | 46.1 |
mean no. of days with ground frost | 16.7 | 14.9 | 13.4 | 11.5 | 6.3 | 1.5 | 0.2 | 0.8 | 2.1 | 4.4 | 12.9 | 14.3 | 98.9 |
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RELATIVE HUMIDITY (%) | | | | | | | | | | | | | |
mean at 0900UTC | 90 | 89 | 87 | 82 | 78 | 79 | 82 | 85 | 88 | 90 | 91 | 91 | 86 |
mean at 1500UTC | 85 | 78 | 73 | 68 | 67 | 69 | 70 | 72 | 75 | 79 | 83 | 86 | 75 |
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SUNSHINE (hours) | | | | | | | | | | | | | |
mean daily duration | 1.41 | 2.08 | 3.03 | 4.52 | 5.28 | 4.91 | 4.28 | 4.07 | 3.32 | 2.44 | 1.79 | 1.13 | 3.19 |
greatest daily duration | 7.5 | 9.5 | 11.3 | 13.4 | 15.3 | 16.0 | 15.7 | 13.5 | 11.7 | 9.3 | 8.5 | 6.7 | 16.0 |
mean no. of days with no sun | 13 | 8 | 6 | 4 | 2 | 2 | 3 | 3 | 5 | 7 | 10 | 14 | 77 |
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RAINFALL (mm) | | | | | | | | | | | | | |
mean monthly total | 90.7 | 67.5 | 77.2 | 56.4 | 67.4 | 67.7 | 60.4 | 85.0 | 83.1 | 96.7 | 85.5 | 90.6 | 928.4 |
greatest daily total | 27.1 | 27.1 | 33.5 | 24.9 | 26.9 | 30.4 | 37.5 | 45.6 | 27.6 | 76.8 | 34.8 | 35.1 | 76.8 |
mean no. of days with >= 0.2mm | 21 | 16 | 19 | 16 | 17 | 17 | 17 | 19 | 18 | 20 | 19 | 20 | 218 |
mean no. of days with >= 1.0mm | 16 | 12 | 14 | 12 | 13 | 12 | 12 | 14 | 14 | 15 | 14 | 15 | 164 |
mean no. of days with >= 5.0mm | 7 | 5 | 6 | 4 | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 7 | 66 |
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WIND (knots) | | | | | | | | | | | | | |
mean monthly speed | 9.8 | 9.6 | 10.1 | 8.5 | 8.0 | 7.2 | 6.9 | 6.9 | 7.5 | 8.5 | 8.5 | 9.4 | 8.4 |
max. gust | 83 | 81 | 73 | 63 | 60 | 57 | 53 | 55 | 87 | 68 | 71 | 75 | 87 |
max. mean 10-minute speed | 54 | 51 | 45 | 40 | 35 | 36 | 32 | 37 | 50 | 40 | 42 | 47 | 54 |
mean no. of days with gales | 1.2 | 0.8 | 0.9 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.2 | 0.3 | 0.3 | 0.5 | 4.8 |
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WEATHER (mean no. of days with...) | | | | | | | | | | | | | |
snow or sleet | 7.1 | 6.4 | 4.9 | 2.0 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.0 | 4.2 | 26.9 |
snow lying at 0900UTC | 4.7 | 2.5 | 1.3 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 1.4 | 10.8 |
hail | 1.2 | 1.9 | 3.9 | 3.0 | 1.7 | 0.4 | 0.1 | 0.1 | 0.3 | 0.7 | 1.2 | 1.0 | 15.5 |
thunder | 0.1 | 0.1 | 0.1 | 0.3 | 1.1 | 1.6 | 0.9 | 0.8 | 0.4 | 0.1 | 0.0 | 0.1 | 5.7 |
fog | 5.1 | 4.4 | 2.7 | 2.9 | 2.0 | 2.0 | 2.3 | 4.7 | 5.2 | 5.1 | 5.7 | 4.7 | 46.8 |