Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 742 | 672 | 742 | 732 | 774 | 747 |
| Tmin | 742 | 670 | 742 | 734 | 773 | 748 |
| Duration of sunshine | 268 | 273 | 270 | 303 | 330 | 331 |
| Precipitation | 622 | 561 | 622 | 619 | 651 | 630 |
| Humidity/Visibility | 92 | 84 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 770 | 772 | 747 | 768 | 743 | 772 |
| Tmin | 769 | 772 | 744 | 768 | 749 | 770 |
| Duration of sunshine | 376 | 362 | 329 | 366 | 289 | 300 |
| Precipitation | 654 | 654 | 630 | 648 | 630 | 651 |
| Humidity/Visibility | 123 | 122 | 118 | 118 | 118 | 123 |
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. |
