Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 709 | 640 | 712 | 699 | 740 | 717 |
| Tmin | 713 | 641 | 708 | 704 | 741 | 716 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 713 | 644 | 715 | 711 | 744 | 720 |
| Humidity/Visibility | 123 | 111 | 121 | 133 | 153 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 740 | 741 | 717 | 728 | 714 | 736 |
| Tmin | 742 | 739 | 715 | 727 | 717 | 739 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 747 | 747 | 721 | 740 | 720 | 742 |
| Humidity/Visibility | 152 | 151 | 147 | 142 | 147 | 149 |
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. |
