Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 829 | 750 | 832 | 806 | 827 | 807 |
| Tmin | 835 | 752 | 836 | 809 | 835 | 804 |
| Duration of sunshine | 340 | 333 | 369 | 355 | 401 | 384 |
| Precipitation | 186 | 169 | 195 | 183 | 190 | 182 |
| Humidity/Visibility | 183 | 166 | 183 | 178 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 831 | 831 | 824 | 854 | 831 | 863 |
| Tmin | 830 | 836 | 830 | 857 | 834 | 865 |
| Duration of sunshine | 400 | 370 | 383 | 396 | 354 | 398 |
| Precipitation | 190 | 192 | 213 | 217 | 214 | 221 |
| Humidity/Visibility | 182 | 183 | 202 | 207 | 206 | 213 |
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. |
