Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 775 | 699 | 771 | 748 | 770 | 746 |
| Tmin | 774 | 701 | 774 | 746 | 775 | 748 |
| Duration of sunshine | 370 | 361 | 398 | 355 | 365 | 414 |
| Precipitation | 124 | 113 | 124 | 121 | 124 | 121 |
| Humidity/Visibility | 122 | 111 | 121 | 117 | 120 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 766 | 770 | 749 | 761 | 713 | 769 |
| Tmin | 772 | 773 | 747 | 769 | 719 | 773 |
| Duration of sunshine | 391 | 427 | 414 | 418 | 353 | 241 |
| Precipitation | 128 | 126 | 120 | 122 | 122 | 124 |
| Humidity/Visibility | 119 | 121 | 117 | 116 | 86 | 120 |
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. |
