Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 339 | 304 | 341 | 339 | 363 | 349 |
| Tmin | 341 | 307 | 340 | 346 | 363 | 342 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 93 | 85 | 95 | 111 | 124 | 122 |
| Humidité/Visibilité | 91 | 84 | 91 | 104 | 123 | 119 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 355 | 354 | 334 | 364 | 357 | 365 |
| Tmin | 360 | 355 | 333 | 365 | 358 | 372 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 126 | 127 | 120 | 124 | 120 | 124 |
| Humidité/Visibilité | 122 | 121 | 118 | 117 | 118 | 124 |
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. |
