Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 556 | 533 | 586 | 539 | 552 | 540 |
| Tmin | 555 | 535 | 586 | 538 | 556 | 538 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 169 | 188 | 181 | 186 | 180 |
| Humidity/Visibility | 154 | 139 | 153 | 119 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 556 | 558 | 566 | 581 | 566 | 587 |
| Tmin | 558 | 561 | 569 | 582 | 569 | 588 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 192 | 210 | 213 | 210 | 217 |
| Humidity/Visibility | 123 | 125 | 147 | 148 | 147 | 152 |
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. |
