Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 748 | 688 | 761 | 761 | 781 | 753 |
| Tmin | 762 | 691 | 762 | 765 | 777 | 761 |
| Duration of sunshine | 280 | 280 | 306 | 269 | 302 | 253 |
| Precipitation | 654 | 592 | 659 | 681 | 687 | 677 |
| Humidity/Visibility | 105 | 103 | 112 | 132 | 129 | 128 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 772 | 785 | 747 | 779 | 745 | 768 |
| Tmin | 792 | 791 | 762 | 779 | 741 | 764 |
| Duration of sunshine | 300 | 305 | 350 | 320 | 302 | 339 |
| Precipitation | 702 | 694 | 674 | 713 | 676 | 690 |
| Humidity/Visibility | 139 | 135 | 121 | 120 | 106 | 117 |
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. |
