Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 635 | 565 | 631 | 614 | 649 | 620 |
| Tmin | 627 | 562 | 607 | 596 | 607 | 590 |
| Duration of sunshine | 58 | 55 | 42 | 49 | 43 | 47 |
| Precipitation | 568 | 523 | 581 | 597 | 620 | 598 |
| Humidity/Visibility | 68 | 51 | 56 | 57 | 65 | 60 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 630 | 637 | 632 | 632 | 607 | 626 |
| Tmin | 607 | 614 | 600 | 607 | 578 | 610 |
| Duration of sunshine | 44 | 50 | 53 | 39 | 42 | 46 |
| Precipitation | 622 | 619 | 597 | 619 | 604 | 184 |
| Humidity/Visibility | 57 | 59 | 75 | 57 | 43 | 49 |
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. |
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