Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 724 | 653 | 740 | 743 | 765 | 743 |
| Tmin | 716 | 655 | 738 | 740 | 761 | 746 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 695 | 625 | 711 | 701 | 727 | 693 |
| Humidity/Visibility | 68 | 66 | 82 | 98 | 99 | 97 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 763 | 763 | 730 | 763 | 735 | 753 |
| Tmin | 763 | 756 | 734 | 750 | 736 | 758 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 716 | 721 | 693 | 719 | 699 | 731 |
| Humidity/Visibility | 97 | 98 | 88 | 100 | 102 | 103 |
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. |
