Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 731 | 642 | 712 | 677 | 680 | 658 |
| Tmin | 733 | 641 | 712 | 675 | 681 | 657 |
| Durée d’insolation | 285 | 217 | 247 | 221 | 210 | 203 |
| Précipitation | 188 | 172 | 186 | 187 | 186 | 182 |
| Humidité/Visibilité | 180 | 165 | 183 | 176 | 183 | 175 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 679 | 654 | 647 | 649 | 629 | 650 |
| Tmin | 680 | 656 | 646 | 650 | 628 | 648 |
| Durée d’insolation | 210 | 189 | 190 | 183 | 207 | 206 |
| Précipitation | 190 | 193 | 218 | 215 | 212 | 221 |
| Humidité/Visibilité | 183 | 182 | 201 | 207 | 202 | 211 |
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. |
