Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 608 | 529 | 586 | 581 | 611 | 572 |
| Tmin | 544 | 484 | 550 | 549 | 575 | 535 |
| Duration of sunshine | 259 | 192 | 223 | 278 | 259 | 232 |
| Precipitation | 559 | 503 | 557 | 533 | 559 | 541 |
| Humidity/Visibility | 115 | 82 | 96 | 125 | 135 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 587 | 593 | 577 | 605 | 608 | 598 |
| Tmin | 566 | 563 | 566 | 575 | 568 | 577 |
| Duration of sunshine | 346 | 310 | 329 | 330 | 276 | 307 |
| Precipitation | 557 | 560 | 572 | 566 | 562 | 561 |
| Humidity/Visibility | 123 | 117 | 124 | 116 | 129 | 118 |
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. |
