Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 656 | 570 | 638 | 624 | 644 | 612 |
| Tmin | 662 | 579 | 644 | 626 | 650 | 626 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 712 | 643 | 711 | 689 | 711 | 692 |
| Humidity/Visibility | 109 | 98 | 110 | 103 | 109 | 107 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 647 | 663 | 632 | 644 | 629 | 647 |
| Tmin | 646 | 657 | 630 | 644 | 628 | 651 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 713 | 747 | 726 | 733 | 695 | 717 |
| Humidity/Visibility | 111 | 126 | 133 | 126 | 104 | 114 |
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. |
