Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 619 | 555 | 628 | 609 | 633 | 605 |
| Tmin | 590 | 546 | 599 | 572 | 595 | 577 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 643 | 578 | 648 | 625 | 646 | 627 |
| Humidity/Visibility | 102 | 88 | 105 | 99 | 107 | 105 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 610 | 623 | 600 | 623 | 621 | 615 |
| Tmin | 583 | 600 | 574 | 609 | 613 | 593 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 649 | 654 | 629 | 646 | 627 | 148 |
| Humidity/Visibility | 110 | 110 | 95 | 101 | 112 | 102 |
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. |
