Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 550 | 503 | 573 | 582 | 602 | 571 |
| Tmin | 571 | 528 | 575 | 577 | 598 | 585 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 115 | 102 | 112 | 150 | 140 | 127 |
| Humidity/Visibility | 75 | 68 | 77 | 104 | 112 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 597 | 605 | 559 | 570 | 570 | 574 |
| Tmin | 595 | 602 | 571 | 590 | 592 | 602 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 148 | 130 | 134 | 143 | 131 | 149 |
| Humidity/Visibility | 114 | 114 | 93 | 97 | 110 | 104 |
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. |
