Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1691 | 1530 | 1692 | 1644 | 1676 | 1641 |
| Tmin | 1698 | 1536 | 1701 | 1640 | 1681 | 1641 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 93 | 60 |
| Precipitation | 187 | 171 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 182 | 165 | 184 | 177 | 181 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1691 | 1684 | 1663 | 1717 | 1673 | 1730 |
| Tmin | 1697 | 1686 | 1671 | 1728 | 1676 | 1731 |
| Duration of sunshine | 93 | 62 | 30 | 62 | 60 | 62 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 177 | 205 | 207 | 204 | 214 |
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. |
