Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 713 | 644 | 711 | 682 | 712 | 686 |
| Tmin | 711 | 644 | 710 | 687 | 711 | 688 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 117 | 124 | 121 | 124 | 123 |
| Humidity/Visibility | 119 | 106 | 115 | 111 | 114 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 711 | 710 | 684 | 709 | 684 | 714 |
| Tmin | 706 | 709 | 684 | 704 | 685 | 712 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 124 | 123 | 123 | 125 | 124 |
| Humidity/Visibility | 118 | 117 | 111 | 113 | 114 | 120 |
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. |
