Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 374 | 339 | 375 | 365 | 381 | 363 |
| Tmin | 375 | 337 | 377 | 362 | 381 | 363 |
| Durée d’insolation | 51 | 49 | 53 | 61 | 73 | 75 |
| Précipitation | 403 | 364 | 404 | 406 | 434 | 420 |
| Humidité/Visibilité | 60 | 53 | 60 | 72 | 86 | 85 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 374 | 375 | 364 | 376 | 362 | 375 |
| Tmin | 374 | 376 | 363 | 376 | 363 | 374 |
| Durée d’insolation | 80 | 77 | 72 | 78 | 85 | 88 |
| Précipitation | 436 | 436 | 420 | 438 | 429 | 465 |
| Humidité/Visibilité | 89 | 91 | 87 | 90 | 93 | 98 |
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. |
