Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 704 | 639 | 705 | 718 | 737 | 716 |
| Tmin | 709 | 642 | 710 | 717 | 738 | 715 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 622 | 572 | 621 | 639 | 652 | 636 |
| Humidity/Visibility | 65 | 60 | 66 | 87 | 89 | 86 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 732 | 740 | 713 | 733 | 710 | 734 |
| Tmin | 737 | 744 | 718 | 739 | 710 | 740 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 659 | 655 | 631 | 649 | 636 | 652 |
| Humidity/Visibility | 86 | 90 | 86 | 85 | 82 | 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. |
