Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 741 | 671 | 743 | 717 | 744 | 720 |
| Tmin | 732 | 660 | 736 | 720 | 743 | 719 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 62 | 61 | 62 | 62 | 62 | 60 |
| Humidity/Visibility | 42 | 38 | 44 | 44 | 46 | 44 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 744 | 744 | 720 | 756 | 748 | 770 |
| Tmin | 743 | 744 | 720 | 751 | 713 | 751 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 62 | 62 | 64 | 80 | 121 | 106 |
| Humidity/Visibility | 46 | 43 | 35 | 54 | 60 | 59 |
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. |
