Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 593 | 555 | 617 | 593 | 598 | 597 |
| Tmin | 585 | 556 | 616 | 587 | 602 | 593 |
| Duration of sunshine | 93 | 84 | 93 | 120 | 124 | 120 |
| Precipitation | 189 | 168 | 187 | 188 | 190 | 182 |
| Humidity/Visibility | 182 | 166 | 184 | 173 | 180 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 613 | 618 | 601 | 643 | 620 | 647 |
| Tmin | 609 | 616 | 603 | 640 | 623 | 640 |
| Duration of sunshine | 93 | 124 | 90 | 124 | 120 | 93 |
| Precipitation | 190 | 191 | 211 | 215 | 219 | 220 |
| Humidity/Visibility | 179 | 183 | 205 | 210 | 202 | 211 |
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. |
