Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 638 | 587 | 662 | 663 | 687 | 644 |
| Tmin | 615 | 549 | 626 | 623 | 660 | 618 |
| Duration of sunshine | 186 | 141 | 124 | 180 | 186 | 150 |
| Precipitation | 160 | 142 | 161 | 174 | 183 | 157 |
| Humidity/Visibility | 69 | 61 | 72 | 109 | 114 | 99 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 644 | 654 | 648 | 666 | 666 | 647 |
| Tmin | 607 | 618 | 624 | 620 | 620 | 625 |
| Duration of sunshine | 217 | 217 | 210 | 217 | 180 | 186 |
| Precipitation | 161 | 157 | 176 | 178 | 170 | 154 |
| Humidity/Visibility | 82 | 85 | 87 | 77 | 81 | 69 |
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. |
