Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 615 | 560 | 613 | 589 | 618 | 593 |
| Tmin | 618 | 556 | 616 | 594 | 615 | 595 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 615 | 610 | 671 | 652 | 661 | 634 |
| Humidity/Visibility | 66 | 81 | 72 | 62 | 58 | 73 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 617 | 603 | 578 | 618 | 594 | 615 |
| Tmin | 619 | 607 | 580 | 615 | 597 | 614 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 628 | 628 | 612 | 632 | 656 | 662 |
| Humidity/Visibility | 54 | 46 | 66 | 76 | 76 | 87 |
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. |
