Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 707 | 638 | 711 | 711 | 743 | 715 |
| Tmin | 711 | 638 | 709 | 712 | 743 | 716 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 717 | 646 | 713 | 716 | 746 | 722 |
| Humidity/Visibility | 120 | 109 | 122 | 142 | 153 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 737 | 740 | 714 | 730 | 716 | 738 |
| Tmin | 739 | 742 | 714 | 733 | 716 | 741 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 752 | 748 | 721 | 741 | 721 | 157 |
| Humidity/Visibility | 150 | 151 | 145 | 146 | 147 | 153 |
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. |
