Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1582 | 1449 | 1596 | 1548 | 1576 | 1546 |
| Tmin | 1588 | 1452 | 1605 | 1548 | 1570 | 1549 |
| Duration of sunshine | 93 | 85 | 93 | 90 | 124 | 120 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 184 | 177 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1592 | 1599 | 1568 | 1624 | 1575 | 1625 |
| Tmin | 1606 | 1604 | 1575 | 1632 | 1582 | 1628 |
| Duration of sunshine | 93 | 93 | 90 | 93 | 90 | 93 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 183 | 203 | 208 | 197 | 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. |
