Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 584 | 529 | 585 | 566 | 582 | 566 |
| Tmin | 585 | 528 | 586 | 565 | 585 | 568 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 168 | 189 | 181 | 186 | 180 |
| Humidity/Visibility | 183 | 166 | 183 | 176 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 584 | 583 | 597 | 605 | 594 | 615 |
| Tmin | 586 | 585 | 590 | 613 | 596 | 619 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 188 | 212 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 183 | 205 | 209 | 203 | 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. |
