Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 704 | 635 | 702 | 690 | 729 | 704 |
| Tmin | 708 | 635 | 700 | 695 | 729 | 708 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 114 | 109 | 107 | 117 | 132 | 128 |
| Humidity/Visibility | 82 | 73 | 82 | 93 | 107 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 735 | 725 | 702 | 726 | 707 | 735 |
| Tmin | 732 | 729 | 700 | 733 | 709 | 738 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 135 | 129 | 130 | 128 | 145 |
| Humidity/Visibility | 114 | 106 | 101 | 104 | 107 | 114 |
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. |
