Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 615 | 552 | 604 | 619 | 643 | 625 |
| Tmin | 614 | 540 | 589 | 570 | 589 | 570 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 712 | 655 | 724 | 760 | 798 | 750 |
| Humidity/Visibility | 24 | 25 | 31 | 71 | 91 | 96 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 650 | 650 | 622 | 622 | 589 | 611 |
| Tmin | 589 | 589 | 570 | 589 | 570 | 589 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 766 | 775 | 737 | 746 | 728 | 759 |
| Humidity/Visibility | 102 | 101 | 54 | 28 | 4 | 5 |
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. |
