Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 744 | 668 | 739 | 739 | 774 | 749 |
| Tmin | 710 | 644 | 712 | 704 | 741 | 717 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 114 | 105 | 121 | 180 | 201 | 210 |
| Humidity/Visibility | 87 | 80 | 89 | 83 | 101 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 760 | 734 | 731 | 774 | 779 | 750 |
| Tmin | 730 | 702 | 700 | 739 | 749 | 739 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 203 | 185 | 200 | 177 | 153 | 105 |
| Humidity/Visibility | 105 | 99 | 115 | 114 | 111 | 107 |
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. |
