Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 676 | 595 | 650 | 653 | 677 | 660 |
| Tmin | 676 | 592 | 651 | 653 | 677 | 657 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 679 | 610 | 684 | 688 | 721 | 690 |
| Humidity/Visibility | 87 | 72 | 89 | 112 | 117 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 674 | 677 | 655 | 670 | 641 | 673 |
| Tmin | 671 | 680 | 655 | 674 | 640 | 674 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 717 | 716 | 693 | 712 | 697 | 717 |
| Humidity/Visibility | 110 | 118 | 114 | 113 | 100 | 112 |
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. |
