Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 645 | 580 | 646 | 633 | 668 | 642 |
| Tmin | 652 | 588 | 648 | 637 | 674 | 652 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 136 | 113 | 139 | 150 | 165 | 142 |
| Humidity/Visibility | 89 | 78 | 85 | 81 | 99 | 93 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 646 | 681 | 648 | 666 | 634 | 658 |
| Tmin | 679 | 689 | 660 | 685 | 656 | 673 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 142 | 165 | 156 | 155 | 130 | 151 |
| Humidity/Visibility | 98 | 120 | 110 | 113 | 103 | 104 |
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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