Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 306 | 279 | 339 | 323 | 338 | 324 |
| Tmin | 310 | 279 | 338 | 319 | 336 | 325 |
| Durée d’insolation | 93 | 84 | 93 | 60 | 93 | 90 |
| Précipitation | 126 | 118 | 156 | 163 | 157 | 152 |
| Humidité/Visibilité | 121 | 111 | 148 | 144 | 152 | 146 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 334 | 292 | 248 | 248 | 240 | 249 |
| Tmin | 338 | 296 | 247 | 248 | 239 | 249 |
| Durée d’insolation | 62 | 93 | 90 | 124 | 120 | 124 |
| Précipitation | 155 | 161 | 152 | 153 | 154 | 159 |
| Humidité/Visibilité | 150 | 148 | 147 | 148 | 145 | 152 |
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. |
