Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 707 | 640 | 706 | 673 | 713 | 705 |
| Tmin | 688 | 624 | 690 | 676 | 704 | 694 |
| Duration of sunshine | 124 | 112 | 186 | 150 | 155 | 150 |
| Precipitation | 629 | 567 | 623 | 587 | 625 | 608 |
| Humidity/Visibility | 48 | 48 | 52 | 48 | 58 | 72 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 730 | 726 | 700 | 708 | 702 | 715 |
| Tmin | 710 | 702 | 685 | 702 | 680 | 716 |
| Duration of sunshine | 155 | 124 | 150 | 217 | 120 | 155 |
| Precipitation | 643 | 654 | 618 | 637 | 630 | 152 |
| Humidity/Visibility | 68 | 67 | 68 | 57 | 58 | 63 |
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. |
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