Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 708 | 637 | 711 | 701 | 740 | 713 |
| Tmin | 709 | 632 | 709 | 706 | 743 | 710 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 715 | 644 | 714 | 710 | 744 | 720 |
| Humidity/Visibility | 120 | 109 | 122 | 134 | 153 | 146 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 741 | 740 | 716 | 730 | 714 | 742 |
| Tmin | 737 | 741 | 715 | 731 | 714 | 739 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 747 | 747 | 726 | 743 | 723 | 744 |
| Humidity/Visibility | 152 | 151 | 146 | 146 | 147 | 154 |
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. |
