Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 707 | 632 | 703 | 687 | 710 | 697 |
| Tmin | 711 | 634 | 709 | 687 | 710 | 701 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 57 | 65 | 63 | 66 | 73 |
| Humidity/Visibility | 60 | 51 | 58 | 57 | 59 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 736 | 725 | 713 | 736 | 698 | 733 |
| Tmin | 732 | 727 | 712 | 734 | 698 | 739 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 98 | 94 | 102 | 97 | 92 | 99 |
| Humidity/Visibility | 85 | 79 | 81 | 80 | 70 | 88 |
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. |
