Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 610 | 555 | 609 | 591 | 609 | 595 |
| Tmin | 615 | 555 | 609 | 593 | 618 | 598 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 620 | 562 | 620 | 603 | 620 | 600 |
| Humidity/Visibility | 179 | 165 | 178 | 171 | 180 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 612 | 598 | 611 | 630 | 617 | 644 |
| Tmin | 616 | 608 | 615 | 635 | 628 | 645 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 622 | 619 | 629 | 649 | 630 | 217 |
| Humidity/Visibility | 180 | 169 | 192 | 200 | 202 | 207 |
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. |
