Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 709 | 639 | 708 | 708 | 736 | 714 |
| Tmin | 702 | 638 | 712 | 702 | 735 | 713 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 724 | 646 | 713 | 720 | 749 | 723 |
| Humidity/Visibility | 115 | 104 | 116 | 132 | 143 | 142 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 732 | 727 | 708 | 720 | 679 | 708 |
| Tmin | 727 | 720 | 704 | 720 | 679 | 700 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 747 | 746 | 730 | 744 | 702 | 133 |
| Humidity/Visibility | 140 | 133 | 131 | 128 | 105 | 116 |
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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