Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 615 | 558 | 606 | 600 | 638 | 610 |
| Tmin | 559 | 510 | 560 | 547 | 561 | 544 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 510 | 455 | 504 | 497 | 535 | 521 |
| Humidity/Visibility | 55 | 51 | 52 | 64 | 78 | 70 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 642 | 635 | 608 | 620 | 614 | 644 |
| Tmin | 560 | 563 | 544 | 559 | 540 | 558 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 531 | 533 | 522 | 531 | 529 | 113 |
| Humidity/Visibility | 84 | 72 | 68 | 60 | 65 | 85 |
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. |
