Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 827 | 745 | 835 | 797 | 826 | 807 |
| Tmin | 832 | 744 | 829 | 800 | 832 | 805 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 719 | 660 | 727 | 701 | 717 | 694 |
| Humidity/Visibility | 179 | 157 | 177 | 171 | 176 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 830 | 825 | 800 | 824 | 800 | 824 |
| Tmin | 826 | 822 | 798 | 814 | 796 | 832 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 717 | 722 | 728 | 748 | 728 | 748 |
| Humidity/Visibility | 180 | 173 | 200 | 203 | 199 | 207 |
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. |
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