Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 390 | 353 | 395 | 370 | 367 | 356 |
| Tmin | 393 | 357 | 393 | 367 | 368 | 359 |
| Durée d’insolation | 67 | 74 | 92 | 79 | 88 | 85 |
| Précipitation | 124 | 112 | 124 | 123 | 127 | 120 |
| Humidité/Visibilité | 112 | 102 | 115 | 104 | 112 | 108 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 375 | 397 | 383 | 388 | 377 | 394 |
| Tmin | 375 | 397 | 380 | 388 | 385 | 394 |
| Durée d’insolation | 93 | 116 | 100 | 90 | 58 | 48 |
| Précipitation | 126 | 157 | 152 | 147 | 119 | 128 |
| Humidité/Visibilité | 118 | 139 | 135 | 129 | 109 | 116 |
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. |
