Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 728 | 655 | 739 | 715 | 742 | 705 |
| Tmin | 753 | 686 | 764 | 746 | 768 | 744 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 767 | 695 | 764 | 728 | 745 | 722 |
| Humidity/Visibility | 119 | 109 | 125 | 119 | 127 | 121 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 732 | 754 | 718 | 729 | 715 | 705 |
| Tmin | 767 | 784 | 761 | 783 | 756 | 742 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 753 | 785 | 762 | 781 | 792 | 811 |
| Humidity/Visibility | 124 | 134 | 127 | 118 | 98 | 97 |
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. |
