Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 614 | 556 | 618 | 603 | 641 | 614 |
| Tmin | 561 | 504 | 560 | 543 | 563 | 552 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 437 | 394 | 434 | 443 | 474 | 452 |
| Humidity/Visibility | 57 | 55 | 60 | 67 | 72 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 636 | 640 | 622 | 643 | 622 | 641 |
| Tmin | 561 | 560 | 541 | 562 | 540 | 559 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 477 | 477 | 457 | 468 | 460 | 99 |
| Humidity/Visibility | 83 | 82 | 79 | 80 | 76 | 84 |
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. |
