Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 566 | 533 | 588 | 568 | 576 | 569 |
| Tmin | 567 | 533 | 588 | 567 | 577 | 568 |
| Durée d’insolation | 31 | 26 | 31 | 29 | 57 | 59 |
| Précipitation | 186 | 168 | 187 | 183 | 188 | 181 |
| Humidité/Visibilité | 184 | 167 | 185 | 178 | 183 | 178 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 584 | 588 | 589 | 610 | 596 | 642 |
| Tmin | 585 | 591 | 591 | 607 | 595 | 642 |
| Durée d’insolation | 59 | 61 | 59 | 61 | 59 | 61 |
| Précipitation | 190 | 190 | 212 | 219 | 212 | 217 |
| Humidité/Visibilité | 181 | 185 | 206 | 208 | 206 | 214 |
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. |
