Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 796 | 722 | 799 | 773 | 802 | 776 |
| Tmin | 796 | 724 | 800 | 777 | 803 | 777 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 795 | 730 | 818 | 807 | 831 | 804 |
| Humidity/Visibility | 174 | 158 | 168 | 164 | 170 | 165 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 794 | 795 | 802 | 814 | 758 | 806 |
| Tmin | 796 | 796 | 806 | 814 | 765 | 802 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 804 | 814 | 810 | 827 | 754 | 805 |
| Humidity/Visibility | 169 | 166 | 197 | 193 | 176 | 177 |
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. |
