Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 725 | 644 | 694 | 678 | 699 | 667 |
| Tmin | 734 | 657 | 709 | 687 | 709 | 685 |
| Duration of sunshine | 62 | 56 | 93 | 120 | 93 | 60 |
| Precipitation | 743 | 672 | 744 | 721 | 744 | 719 |
| Humidity/Visibility | 144 | 125 | 144 | 135 | 142 | 137 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 692 | 717 | 704 | 721 | 702 | 728 |
| Tmin | 702 | 719 | 710 | 724 | 713 | 731 |
| Duration of sunshine | 124 | 93 | 90 | 62 | 60 | 93 |
| Precipitation | 743 | 778 | 753 | 768 | 720 | 753 |
| Humidity/Visibility | 140 | 158 | 165 | 157 | 137 | 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. |
