Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 705 | 617 | 681 | 678 | 706 | 686 |
| Tmin | 704 | 621 | 681 | 679 | 708 | 685 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 654 | 585 | 648 | 651 | 679 | 660 |
| Humidity/Visibility | 116 | 96 | 111 | 124 | 142 | 138 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 710 | 708 | 687 | 698 | 688 | 709 |
| Tmin | 703 | 710 | 685 | 700 | 686 | 710 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 673 | 678 | 659 | 666 | 630 | 652 |
| Humidity/Visibility | 142 | 143 | 139 | 130 | 118 | 123 |
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. |
