Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1631 | 1472 | 1635 | 1603 | 1658 | 1606 |
| Tmin | 1641 | 1479 | 1636 | 1601 | 1659 | 1605 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 159 | 141 | 157 | 173 | 189 | 182 |
| Humidity/Visibility | 151 | 134 | 150 | 165 | 181 | 171 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1656 | 1649 | 1596 | 1648 | 1608 | 1663 |
| Tmin | 1667 | 1664 | 1615 | 1664 | 1615 | 1667 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 189 | 188 | 182 | 185 | 184 | 187 |
| Humidity/Visibility | 177 | 176 | 170 | 172 | 173 | 180 |
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. |
