Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 776 | 709 | 775 | 768 | 796 | 767 |
| Tmin | 775 | 703 | 783 | 774 | 798 | 766 |
| Duration of sunshine | 186 | 142 | 93 | 150 | 93 | 90 |
| Precipitation | 703 | 650 | 715 | 723 | 721 | 701 |
| Humidity/Visibility | 90 | 86 | 90 | 99 | 106 | 99 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 803 | 789 | 751 | 766 | 741 | 781 |
| Tmin | 809 | 782 | 755 | 764 | 739 | 776 |
| Duration of sunshine | 155 | 124 | 180 | 124 | 30 | 124 |
| Precipitation | 729 | 718 | 690 | 720 | 694 | 205 |
| Humidity/Visibility | 117 | 99 | 84 | 75 | 72 | 90 |
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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