Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 786 | 712 | 798 | 774 | 799 | 760 |
| Tmin | 793 | 718 | 794 | 777 | 804 | 774 |
| Duration of sunshine | 131 | 121 | 131 | 125 | 137 | 129 |
| Precipitation | 744 | 672 | 748 | 721 | 744 | 720 |
| Humidity/Visibility | 144 | 132 | 143 | 128 | 128 | 127 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 790 | 815 | 794 | 819 | 795 | 792 |
| Tmin | 795 | 813 | 796 | 816 | 798 | 797 |
| Duration of sunshine | 136 | 153 | 155 | 143 | 95 | 123 |
| Precipitation | 749 | 774 | 754 | 773 | 755 | 754 |
| Humidity/Visibility | 128 | 141 | 148 | 159 | 142 | 138 |
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. |
