Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 586 | 559 | 610 | 595 | 608 | 592 |
| Tmin | 586 | 555 | 606 | 593 | 606 | 589 |
| Duration of sunshine | 392 | 330 | 426 | 381 | 422 | 413 |
| Precipitation | 190 | 170 | 186 | 185 | 186 | 184 |
| Humidity/Visibility | 180 | 164 | 182 | 175 | 181 | 174 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 615 | 616 | 613 | 640 | 620 | 645 |
| Tmin | 616 | 618 | 612 | 640 | 619 | 643 |
| Duration of sunshine | 389 | 337 | 401 | 413 | 437 | 485 |
| Precipitation | 190 | 190 | 214 | 215 | 216 | 219 |
| Humidity/Visibility | 179 | 181 | 200 | 205 | 202 | 210 |
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. |
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