Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 681 | 610 | 701 | 680 | 710 | 688 |
| Tmin | 681 | 613 | 700 | 686 | 713 | 687 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 438 | 393 | 458 | 451 | 465 | 450 |
| Humidity/Visibility | 72 | 62 | 90 | 92 | 96 | 93 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 703 | 703 | 689 | 707 | 689 | 684 |
| Tmin | 706 | 702 | 685 | 701 | 686 | 684 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 465 | 466 | 453 | 463 | 451 | 439 |
| Humidity/Visibility | 90 | 84 | 81 | 84 | 95 | 70 |
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. |
