Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 613 | 557 | 646 | 653 | 659 | 641 |
| Tmin | 637 | 577 | 645 | 645 | 644 | 629 |
| Duration of sunshine | 100 | 96 | 108 | 129 | 109 | 108 |
| Precipitation | 522 | 475 | 550 | 538 | 565 | 545 |
| Humidity/Visibility | 68 | 62 | 84 | 92 | 90 | 86 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 650 | 662 | 647 | 650 | 608 | 619 |
| Tmin | 647 | 666 | 661 | 659 | 657 | 689 |
| Duration of sunshine | 116 | 137 | 139 | 121 | 134 | 150 |
| Precipitation | 567 | 561 | 566 | 557 | 566 | 557 |
| Humidity/Visibility | 84 | 92 | 96 | 82 | 90 | 83 |
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. |
