Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 745 | 695 | 768 | 759 | 802 | 779 |
| Tmin | 744 | 698 | 771 | 760 | 805 | 778 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 93 | 88 | 96 | 109 | 126 | 120 |
| Humidity/Visibility | 92 | 83 | 91 | 104 | 122 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 802 | 804 | 762 | 785 | 771 | 793 |
| Tmin | 806 | 805 | 764 | 791 | 774 | 797 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 129 | 120 | 124 | 122 | 125 |
| Humidity/Visibility | 122 | 121 | 117 | 117 | 117 | 123 |
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. |
