Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 681 | 614 | 679 | 660 | 678 | 658 |
| Tmin | 772 | 696 | 771 | 743 | 773 | 745 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 715 | 644 | 713 | 697 | 715 | 692 |
| Humidity/Visibility | 137 | 124 | 137 | 132 | 136 | 132 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 679 | 667 | 653 | 688 | 653 | 677 |
| Tmin | 772 | 758 | 744 | 796 | 774 | 801 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 715 | 703 | 694 | 742 | 720 | 217 |
| Humidity/Visibility | 136 | 124 | 131 | 161 | 145 | 150 |
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. |
