Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 567 | 523 | 597 | 590 | 608 | 580 |
| Tmin | 538 | 492 | 595 | 589 | 603 | 583 |
| Duration of sunshine | 125 | 142 | 93 | 150 | 155 | 60 |
| Precipitation | 517 | 470 | 538 | 566 | 560 | 528 |
| Humidity/Visibility | 62 | 63 | 97 | 104 | 102 | 98 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 597 | 580 | 550 | 560 | 543 | 583 |
| Tmin | 593 | 575 | 558 | 549 | 543 | 571 |
| Duration of sunshine | 93 | 93 | 180 | 124 | 90 | 248 |
| Precipitation | 550 | 553 | 523 | 560 | 538 | 187 |
| Humidity/Visibility | 93 | 71 | 71 | 64 | 63 | 77 |
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. |
