Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 678 | 612 | 695 | 704 | 727 | 684 |
| Tmin | 646 | 583 | 644 | 652 | 672 | 613 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 833 | 753 | 835 | 833 | 857 | 822 |
| Humidity/Visibility | 75 | 68 | 83 | 111 | 114 | 93 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 722 | 733 | 714 | 732 | 700 | 711 |
| Tmin | 644 | 647 | 628 | 645 | 616 | 647 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 846 | 868 | 839 | 861 | 869 | 923 |
| Humidity/Visibility | 109 | 114 | 111 | 103 | 91 | 91 |
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. |
