Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 771 | 699 | 773 | 747 | 774 | 746 |
| Tmin | 765 | 698 | 774 | 745 | 774 | 745 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 713 | 644 | 715 | 691 | 715 | 690 |
| Humidity/Visibility | 151 | 138 | 153 | 146 | 153 | 145 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 769 | 771 | 750 | 768 | 746 | 769 |
| Tmin | 766 | 774 | 747 | 766 | 743 | 771 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 711 | 713 | 692 | 713 | 692 | 713 |
| Humidity/Visibility | 148 | 151 | 148 | 149 | 146 | 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. |
