Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 184 | 166 | 186 | 179 | 185 | 179 |
| Tmin | 186 | 166 | 186 | 179 | 186 | 177 |
| Durée d’insolation | 186 | 163 | 186 | 179 | 185 | 177 |
| Précipitation | 188 | 168 | 186 | 181 | 186 | 180 |
| Humidité/Visibilité | 185 | 167 | 185 | 179 | 185 | 178 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 182 | 185 | 208 | 207 | 205 | 217 |
| Tmin | 185 | 188 | 209 | 208 | 208 | 217 |
| Durée d’insolation | 185 | 188 | 209 | 208 | 208 | 217 |
| Précipitation | 190 | 190 | 210 | 215 | 210 | 217 |
| Humidité/Visibilité | 184 | 184 | 206 | 209 | 207 | 215 |
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. |
