Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 766 | 713 | 797 | 774 | 804 | 774 |
| Tmin | 783 | 721 | 803 | 777 | 803 | 776 |
| Duration of sunshine | 131 | 124 | 128 | 115 | 127 | 130 |
| Precipitation | 806 | 728 | 805 | 781 | 806 | 780 |
| Humidity/Visibility | 107 | 99 | 116 | 112 | 113 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 799 | 821 | 799 | 822 | 796 | 773 |
| Tmin | 801 | 821 | 800 | 820 | 803 | 783 |
| Duration of sunshine | 132 | 154 | 158 | 136 | 93 | 135 |
| Precipitation | 810 | 839 | 814 | 834 | 810 | 812 |
| Humidity/Visibility | 115 | 127 | 130 | 128 | 127 | 111 |
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. |
