Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 630 | 583 | 632 | 614 | 648 | 623 |
| Tmin | 626 | 581 | 634 | 622 | 645 | 626 |
| Duration of sunshine | 87 | 89 | 60 | 75 | 97 | 103 |
| Precipitation | 566 | 507 | 565 | 550 | 561 | 547 |
| Humidity/Visibility | 94 | 105 | 108 | 103 | 115 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 643 | 646 | 610 | 640 | 617 | 630 |
| Tmin | 643 | 647 | 617 | 633 | 620 | 636 |
| Duration of sunshine | 94 | 93 | 98 | 97 | 102 | 101 |
| Precipitation | 561 | 564 | 548 | 565 | 548 | 133 |
| Humidity/Visibility | 116 | 116 | 102 | 104 | 107 | 105 |
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. |
