Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1614 | 1473 | 1633 | 1585 | 1609 | 1578 |
| Tmin | 1595 | 1457 | 1632 | 1583 | 1610 | 1579 |
| Duration of sunshine | 93 | 86 | 93 | 60 | 124 | 150 |
| Precipitation | 188 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 174 | 153 | 173 | 167 | 173 | 171 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1617 | 1620 | 1598 | 1653 | 1607 | 1659 |
| Tmin | 1630 | 1622 | 1606 | 1659 | 1611 | 1639 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 186 | 191 | 210 | 215 | 210 | 218 |
| Humidity/Visibility | 163 | 164 | 193 | 203 | 202 | 207 |
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. |
