Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 835 | 752 | 832 | 809 | 833 | 804 |
| Tmin | 834 | 751 | 834 | 804 | 833 | 806 |
| Duration of sunshine | 302 | 242 | 272 | 251 | 257 | 247 |
| Precipitation | 186 | 168 | 187 | 181 | 190 | 184 |
| Humidity/Visibility | 183 | 165 | 184 | 178 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 831 | 832 | 834 | 858 | 831 | 863 |
| Tmin | 836 | 836 | 835 | 858 | 834 | 865 |
| Duration of sunshine | 236 | 242 | 256 | 297 | 308 | 333 |
| Precipitation | 186 | 190 | 212 | 215 | 210 | 217 |
| Humidity/Visibility | 183 | 183 | 206 | 209 | 202 | 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. |
