Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 612 | 557 | 613 | 604 | 642 | 620 |
| Tmin | 559 | 507 | 558 | 546 | 562 | 545 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 562 | 506 | 562 | 557 | 591 | 575 |
| Humidity/Visibility | 58 | 54 | 55 | 67 | 85 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 645 | 644 | 619 | 637 | 619 | 639 |
| Tmin | 560 | 566 | 541 | 559 | 540 | 558 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 594 | 592 | 570 | 587 | 576 | 102 |
| Humidity/Visibility | 88 | 85 | 83 | 75 | 79 | 87 |
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. |
