Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 103 | 99 | 105 | 85 | 99 | 90 |
| Tmin | 104 | 109 | 109 | 96 | 106 | 101 |
| Durée d’insolation | 99 | 108 | 105 | 94 | 108 | 98 |
| Précipitation | 134 | 115 | 135 | 133 | 128 | 131 |
| Humidité/Visibilité | 84 | 86 | 86 | 78 | 87 | 78 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 101 | 112 | 95 | 97 | 98 | 107 |
| Tmin | 108 | 117 | 102 | 106 | 96 | 110 |
| Durée d’insolation | 97 | 117 | 103 | 101 | 95 | 107 |
| Précipitation | 127 | 134 | 124 | 132 | 130 | 139 |
| Humidité/Visibilité | 85 | 92 | 82 | 83 | 82 | 91 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
