Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 706 | 633 | 703 | 709 | 737 | 715 |
| Tmin | 706 | 634 | 706 | 704 | 743 | 714 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 716 | 646 | 719 | 719 | 744 | 722 |
| Humidity/Visibility | 118 | 106 | 115 | 138 | 152 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 736 | 734 | 714 | 726 | 713 | 742 |
| Tmin | 736 | 739 | 709 | 734 | 718 | 740 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 747 | 744 | 725 | 744 | 721 | 744 |
| Humidity/Visibility | 152 | 147 | 144 | 146 | 147 | 152 |
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. |
