Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1663 | 1501 | 1659 | 1608 | 1647 | 1605 |
| Tmin | 1671 | 1504 | 1671 | 1615 | 1651 | 1608 |
| Duration of sunshine | 93 | 86 | 93 | 60 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 180 | 166 | 182 | 176 | 179 | 174 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1658 | 1658 | 1636 | 1691 | 1643 | 1699 |
| Tmin | 1665 | 1666 | 1642 | 1698 | 1648 | 1697 |
| Duration of sunshine | 186 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 186 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 176 | 178 | 199 | 205 | 205 | 215 |
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. |
