Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 735 | 678 | 743 | 700 | 724 | 674 |
| Tmin | 771 | 713 | 785 | 748 | 795 | 754 |
| Duration of sunshine | 5 | 3 | 1 | 1 | 1 | 0 |
| Precipitation | 138 | 131 | 135 | 134 | 154 | 138 |
| Humidity/Visibility | 70 | 74 | 78 | 57 | 67 | 50 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 695 | 706 | 692 | 730 | 689 | 730 |
| Tmin | 756 | 764 | 731 | 748 | 693 | 755 |
| Duration of sunshine | 0 | 0 | 3 | 1 | 0 | 0 |
| Precipitation | 127 | 128 | 121 | 120 | 123 | 141 |
| Humidity/Visibility | 43 | 48 | 47 | 54 | 26 | 61 |
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. |
