Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 750 | 688 | 747 | 732 | 747 | 738 |
| Tmin | 734 | 685 | 742 | 723 | 755 | 717 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 745 | 672 | 745 | 719 | 735 | 691 |
| Humidity/Visibility | 145 | 139 | 138 | 145 | 141 | 123 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 757 | 766 | 766 | 776 | 768 | 766 |
| Tmin | 753 | 747 | 753 | 775 | 755 | 769 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 714 | 720 | 720 | 743 | 718 | 741 |
| Humidity/Visibility | 127 | 133 | 148 | 149 | 145 | 145 |
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. |
