Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 706 | 641 | 704 | 704 | 738 | 713 |
| Tmin | 709 | 636 | 703 | 707 | 738 | 715 |
| Duration of sunshine | 108 | 131 | 128 | 149 | 128 | 116 |
| Precipitation | 101 | 99 | 105 | 123 | 136 | 124 |
| Humidity/Visibility | 85 | 78 | 83 | 107 | 116 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 734 | 733 | 702 | 729 | 703 | 727 |
| Tmin | 736 | 735 | 711 | 732 | 701 | 725 |
| Duration of sunshine | 153 | 89 | 121 | 131 | 149 | 182 |
| Precipitation | 131 | 132 | 138 | 134 | 144 | 148 |
| Humidity/Visibility | 115 | 115 | 105 | 108 | 99 | 110 |
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. |
