Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 557 | 519 | 578 | 582 | 585 | 558 |
| Tmin | 555 | 516 | 579 | 580 | 597 | 559 |
| Duration of sunshine | 139 | 191 | 156 | 214 | 224 | 153 |
| Precipitation | 585 | 544 | 591 | 608 | 629 | 569 |
| Humidity/Visibility | 39 | 47 | 61 | 79 | 80 | 56 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 592 | 582 | 571 | 575 | 552 | 559 |
| Tmin | 594 | 579 | 580 | 581 | 549 | 564 |
| Duration of sunshine | 202 | 119 | 166 | 156 | 94 | 157 |
| Precipitation | 626 | 623 | 609 | 630 | 585 | 117 |
| Humidity/Visibility | 82 | 63 | 82 | 59 | 46 | 41 |
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. |
