Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 765 | 684 | 769 | 774 | 804 | 779 |
| Tmin | 771 | 691 | 772 | 773 | 804 | 774 |
| Duration of sunshine | 208 | 184 | 207 | 255 | 271 | 255 |
| Precipitation | 746 | 674 | 746 | 754 | 775 | 750 |
| Humidity/Visibility | 89 | 75 | 90 | 108 | 116 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 799 | 794 | 777 | 795 | 773 | 771 |
| Tmin | 796 | 793 | 778 | 791 | 760 | 775 |
| Duration of sunshine | 262 | 230 | 233 | 219 | 231 | 245 |
| Precipitation | 775 | 803 | 766 | 773 | 753 | 750 |
| Humidity/Visibility | 111 | 104 | 108 | 108 | 102 | 91 |
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. |
