Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 705 | 635 | 735 | 723 | 740 | 715 |
| Tmin | 680 | 612 | 698 | 689 | 703 | 686 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 86 | 143 | 144 | 149 | 145 |
| Humidity/Visibility | 51 | 41 | 70 | 77 | 70 | 74 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 728 | 744 | 728 | 754 | 730 | 712 |
| Tmin | 703 | 722 | 714 | 726 | 712 | 709 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 153 | 157 | 150 | 151 | 147 | 129 |
| Humidity/Visibility | 65 | 74 | 73 | 78 | 85 | 60 |
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. |
