Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 701 | 632 | 705 | 679 | 701 | 678 |
| Tmin | 702 | 636 | 703 | 677 | 703 | 682 |
| Duration of sunshine | 72 | 76 | 84 | 91 | 107 | 98 |
| Precipitation | 682 | 616 | 682 | 663 | 688 | 660 |
| Humidity/Visibility | 111 | 101 | 114 | 103 | 110 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 704 | 732 | 705 | 719 | 677 | 704 |
| Tmin | 708 | 729 | 708 | 715 | 685 | 704 |
| Duration of sunshine | 105 | 129 | 125 | 98 | 66 | 58 |
| Precipitation | 684 | 713 | 696 | 704 | 661 | 686 |
| Humidity/Visibility | 117 | 136 | 134 | 128 | 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. |
