Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 481 | 427 | 484 | 500 | 520 | 498 |
| Tmin | 609 | 555 | 614 | 625 | 646 | 618 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 95 | 99 | 130 | 129 | 131 |
| Humidity/Visibility | 64 | 56 | 64 | 84 | 87 | 81 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 502 | 518 | 499 | 509 | 493 | 512 |
| Tmin | 633 | 648 | 628 | 640 | 618 | 646 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 134 | 132 | 124 | 125 | 128 | 135 |
| Humidity/Visibility | 80 | 88 | 85 | 82 | 79 | 85 |
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. |
