Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 671 | 606 | 678 | 670 | 700 | 679 |
| Tmin | 659 | 604 | 682 | 681 | 699 | 676 |
| Duration of sunshine | 36 | 31 | 42 | 48 | 49 | 48 |
| Precipitation | 99 | 87 | 106 | 123 | 126 | 119 |
| Humidity/Visibility | 67 | 58 | 69 | 77 | 82 | 78 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 701 | 698 | 679 | 706 | 678 | 695 |
| Tmin | 710 | 703 | 682 | 703 | 678 | 709 |
| Duration of sunshine | 60 | 78 | 84 | 68 | 74 | 55 |
| Precipitation | 126 | 122 | 115 | 127 | 126 | 134 |
| Humidity/Visibility | 84 | 83 | 79 | 80 | 80 | 90 |
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. |
