Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 706 | 631 | 704 | 687 | 711 | 695 |
| Tmin | 709 | 635 | 710 | 688 | 708 | 702 |
| Duration of sunshine | 279 | 197 | 217 | 240 | 217 | 300 |
| Precipitation | 64 | 59 | 62 | 62 | 67 | 73 |
| Humidity/Visibility | 60 | 52 | 60 | 58 | 60 | 67 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 737 | 726 | 714 | 737 | 701 | 730 |
| Tmin | 734 | 728 | 712 | 736 | 703 | 738 |
| Duration of sunshine | 279 | 279 | 300 | 279 | 180 | 248 |
| Precipitation | 98 | 94 | 100 | 97 | 92 | 101 |
| Humidity/Visibility | 86 | 78 | 80 | 82 | 73 | 89 |
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. |
