Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 745 | 685 | 744 | 720 | 742 | 712 |
| Tmin | 751 | 683 | 736 | 692 | 726 | 695 |
| Duration of sunshine | 186 | 114 | 31 | 120 | 186 | 210 |
| Precipitation | 649 | 588 | 668 | 650 | 661 | 619 |
| Humidity/Visibility | 97 | 94 | 99 | 91 | 97 | 103 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 741 | 760 | 744 | 767 | 722 | 764 |
| Tmin | 748 | 747 | 741 | 768 | 732 | 775 |
| Duration of sunshine | 93 | 217 | 150 | 155 | 90 | 155 |
| Precipitation | 636 | 642 | 652 | 676 | 664 | 684 |
| Humidity/Visibility | 121 | 122 | 124 | 121 | 106 | 128 |
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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