Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 568 | 532 | 584 | 595 | 610 | 594 |
| Tmin | 718 | 672 | 718 | 687 | 697 | 686 |
| Duration of sunshine | 211 | 279 | 284 | 294 | 235 | 265 |
| Precipitation | 93 | 87 | 137 | 227 | 242 | 237 |
| Humidity/Visibility | 61 | 53 | 46 | 58 | 59 | 58 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 609 | 616 | 579 | 612 | 599 | 664 |
| Tmin | 702 | 707 | 668 | 743 | 741 | 765 |
| Duration of sunshine | 276 | 243 | 327 | 340 | 290 | 303 |
| Precipitation | 242 | 244 | 238 | 168 | 122 | 131 |
| Humidity/Visibility | 60 | 60 | 59 | 66 | 73 | 87 |
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. |
