Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 694 | 626 | 683 | 654 | 685 | 666 |
| Tmin | 709 | 646 | 715 | 675 | 703 | 695 |
| Duration of sunshine | 237 | 245 | 270 | 218 | 270 | 185 |
| Precipitation | 575 | 515 | 553 | 536 | 559 | 546 |
| Humidity/Visibility | 59 | 49 | 55 | 35 | 43 | 47 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 688 | 697 | 683 | 701 | 669 | 699 |
| Tmin | 709 | 705 | 700 | 722 | 705 | 726 |
| Duration of sunshine | 240 | 177 | 244 | 279 | 212 | 312 |
| Precipitation | 573 | 581 | 579 | 598 | 574 | 170 |
| Humidity/Visibility | 49 | 61 | 68 | 69 | 70 | 69 |
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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