Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 707 | 635 | 704 | 705 | 740 | 703 |
| Tmin | 703 | 633 | 703 | 702 | 737 | 699 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 721 | 654 | 721 | 724 | 748 | 728 |
| Humidity/Visibility | 114 | 102 | 114 | 133 | 147 | 134 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 738 | 729 | 713 | 727 | 708 | 733 |
| Tmin | 737 | 729 | 709 | 729 | 705 | 732 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 752 | 741 | 723 | 744 | 723 | 154 |
| Humidity/Visibility | 148 | 144 | 141 | 144 | 140 | 144 |
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. |
