Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 738 | 670 | 743 | 730 | 766 | 738 |
| Tmin | 685 | 617 | 682 | 661 | 683 | 664 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 590 | 534 | 595 | 593 | 624 | 603 |
| Humidity/Visibility | 58 | 53 | 59 | 70 | 82 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 772 | 761 | 742 | 764 | 740 | 768 |
| Tmin | 683 | 688 | 662 | 684 | 660 | 683 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 633 | 635 | 608 | 637 | 602 | 636 |
| Humidity/Visibility | 88 | 84 | 81 | 73 | 77 | 84 |
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. |
