Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 758 | 679 | 761 | 748 | 771 | 750 |
| Tmin | 760 | 685 | 767 | 746 | 769 | 746 |
| Duration of sunshine | 91 | 78 | 89 | 85 | 85 | 85 |
| Precipitation | 618 | 561 | 621 | 601 | 620 | 601 |
| Humidity/Visibility | 128 | 121 | 141 | 136 | 144 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 768 | 781 | 754 | 773 | 750 | 763 |
| Tmin | 767 | 781 | 762 | 773 | 763 | 759 |
| Duration of sunshine | 82 | 78 | 85 | 85 | 85 | 118 |
| Precipitation | 629 | 649 | 623 | 637 | 622 | 158 |
| Humidity/Visibility | 145 | 151 | 152 | 152 | 147 | 129 |
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. |
