Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 135 | 119 | 135 | 142 | 146 | 145 |
| Tmin | 130 | 126 | 144 | 142 | 150 | 144 |
| Durée d’insolation | 306 | 301 | 330 | 321 | 366 | 352 |
| Précipitation | 156 | 141 | 155 | 151 | 155 | 150 |
| Humidité/Visibilité | 141 | 129 | 150 | 145 | 151 | 146 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 144 | 133 | 125 | 131 | 121 | 134 |
| Tmin | 143 | 132 | 135 | 137 | 141 | 140 |
| Durée d’insolation | 360 | 328 | 349 | 360 | 298 | 365 |
| Précipitation | 155 | 155 | 150 | 153 | 150 | 155 |
| Humidité/Visibilité | 145 | 136 | 137 | 136 | 133 | 144 |
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. |
