Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 773 | 698 | 775 | 745 | 772 | 747 |
| Tmin | 774 | 700 | 774 | 748 | 775 | 749 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 744 | 672 | 744 | 721 | 744 | 720 |
| Humidity/Visibility | 153 | 138 | 154 | 148 | 153 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 772 | 767 | 744 | 762 | 746 | 759 |
| Tmin | 773 | 769 | 744 | 762 | 746 | 756 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 744 | 754 | 732 | 758 | 720 | 747 |
| Humidity/Visibility | 153 | 149 | 143 | 144 | 146 | 136 |
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. |
