Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 746 | 673 | 745 | 722 | 745 | 721 |
| Tmin | 776 | 700 | 775 | 750 | 775 | 750 |
| Duration of sunshine | 124 | 113 | 186 | 210 | 279 | 210 |
| Precipitation | 63 | 59 | 64 | 77 | 91 | 91 |
| Humidity/Visibility | 61 | 56 | 60 | 74 | 88 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 744 | 748 | 721 | 745 | 720 | 750 |
| Tmin | 775 | 775 | 750 | 775 | 750 | 780 |
| Duration of sunshine | 248 | 217 | 210 | 248 | 180 | 31 |
| Precipitation | 97 | 94 | 91 | 89 | 90 | 94 |
| Humidity/Visibility | 87 | 91 | 88 | 84 | 86 | 92 |
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. |
