Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 708 | 642 | 715 | 673 | 702 | 678 |
| Tmin | 758 | 684 | 764 | 735 | 737 | 706 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 636 | 577 | 641 | 622 | 631 | 615 |
| Humidity/Visibility | 85 | 78 | 85 | 75 | 73 | 79 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 703 | 723 | 703 | 713 | 669 | 714 |
| Tmin | 732 | 737 | 716 | 733 | 689 | 741 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 649 | 650 | 618 | 644 | 620 | 654 |
| Humidity/Visibility | 88 | 91 | 85 | 83 | 60 | 92 |
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. |
