Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 610 | 554 | 611 | 624 | 643 | 623 |
| Tmin | 618 | 558 | 612 | 624 | 642 | 623 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 503 | 460 | 503 | 519 | 533 | 521 |
| Humidity/Visibility | 66 | 60 | 64 | 85 | 87 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 640 | 646 | 622 | 641 | 618 | 637 |
| Tmin | 641 | 649 | 621 | 642 | 617 | 645 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 533 | 532 | 524 | 530 | 516 | 533 |
| Humidity/Visibility | 85 | 89 | 83 | 84 | 82 | 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. |
