Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 784 | 697 | 786 | 766 | 800 | 763 |
| Tmin | 776 | 697 | 777 | 761 | 804 | 770 |
| Duration of sunshine | 352 | 209 | 303 | 324 | 410 | 329 |
| Precipitation | 688 | 627 | 688 | 698 | 725 | 710 |
| Humidity/Visibility | 96 | 87 | 102 | 106 | 118 | 108 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 799 | 793 | 780 | 798 | 751 | 780 |
| Tmin | 797 | 787 | 773 | 796 | 742 | 780 |
| Duration of sunshine | 352 | 350 | 372 | 340 | 254 | 400 |
| Precipitation | 722 | 728 | 722 | 740 | 684 | 140 |
| Humidity/Visibility | 116 | 108 | 123 | 118 | 82 | 95 |
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. |
