Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 598 | 559 | 614 | 592 | 615 | 591 |
| Tmin | 601 | 560 | 615 | 595 | 619 | 599 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 169 | 187 | 181 | 190 | 180 |
| Humidity/Visibility | 184 | 167 | 185 | 178 | 183 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 617 | 618 | 612 | 614 | 597 | 618 |
| Tmin | 615 | 618 | 612 | 614 | 596 | 619 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 189 | 211 | 214 | 213 | 217 |
| Humidity/Visibility | 184 | 185 | 206 | 209 | 206 | 216 |
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. |
