Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 828 | 751 | 830 | 808 | 832 | 804 |
| Tmin | 835 | 751 | 836 | 806 | 834 | 807 |
| Duration of sunshine | 431 | 416 | 430 | 444 | 427 | 474 |
| Precipitation | 191 | 171 | 195 | 183 | 188 | 182 |
| Humidity/Visibility | 181 | 165 | 183 | 176 | 184 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 829 | 831 | 834 | 855 | 829 | 852 |
| Tmin | 830 | 837 | 836 | 858 | 834 | 863 |
| Duration of sunshine | 458 | 463 | 474 | 482 | 443 | 486 |
| Precipitation | 187 | 196 | 218 | 223 | 222 | 227 |
| Humidity/Visibility | 181 | 183 | 205 | 207 | 203 | 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. |
