Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 744 | 672 | 744 | 734 | 774 | 749 |
| Tmin | 740 | 671 | 741 | 733 | 769 | 747 |
| Duration of sunshine | 330 | 300 | 270 | 330 | 392 | 377 |
| Precipitation | 95 | 87 | 94 | 107 | 124 | 120 |
| Humidity/Visibility | 92 | 84 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 773 | 774 | 749 | 769 | 746 | 774 |
| Tmin | 768 | 771 | 745 | 768 | 749 | 769 |
| Duration of sunshine | 387 | 408 | 371 | 380 | 376 | 357 |
| Precipitation | 126 | 126 | 118 | 121 | 120 | 124 |
| Humidity/Visibility | 123 | 122 | 118 | 118 | 118 | 122 |
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. |
