Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 739 | 673 | 742 | 728 | 770 | 746 |
| Tmin | 736 | 669 | 740 | 734 | 769 | 748 |
| Duration of sunshine | 257 | 256 | 249 | 287 | 314 | 284 |
| Precipitation | 589 | 535 | 590 | 587 | 620 | 600 |
| Humidity/Visibility | 92 | 84 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 770 | 774 | 749 | 770 | 746 | 771 |
| Tmin | 763 | 768 | 744 | 769 | 750 | 773 |
| Duration of sunshine | 321 | 327 | 305 | 321 | 248 | 303 |
| Precipitation | 623 | 622 | 600 | 617 | 600 | 620 |
| Humidity/Visibility | 123 | 122 | 118 | 118 | 119 | 123 |
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. |
