Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 701 | 633 | 705 | 670 | 677 | 656 |
| Tmin | 703 | 635 | 703 | 670 | 678 | 659 |
| Duration of sunshine | 66 | 63 | 96 | 81 | 88 | 87 |
| Precipitation | 682 | 616 | 682 | 661 | 685 | 660 |
| Humidity/Visibility | 112 | 102 | 115 | 105 | 112 | 109 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 684 | 707 | 684 | 699 | 677 | 704 |
| Tmin | 684 | 707 | 682 | 698 | 684 | 704 |
| Duration of sunshine | 92 | 116 | 100 | 89 | 73 | 49 |
| Precipitation | 684 | 715 | 696 | 705 | 661 | 688 |
| Humidity/Visibility | 118 | 139 | 136 | 129 | 109 | 116 |
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. |
