Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 679 | 596 | 650 | 657 | 677 | 655 |
| Tmin | 712 | 643 | 709 | 718 | 736 | 714 |
| Duration of sunshine | 247 | 278 | 301 | 356 | 302 | 353 |
| Precipitation | 96 | 89 | 101 | 125 | 128 | 126 |
| Humidity/Visibility | 60 | 50 | 52 | 71 | 75 | 71 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 679 | 676 | 654 | 675 | 655 | 678 |
| Tmin | 737 | 738 | 714 | 735 | 716 | 742 |
| Duration of sunshine | 335 | 392 | 381 | 360 | 295 | 305 |
| Precipitation | 130 | 132 | 122 | 128 | 123 | 128 |
| Humidity/Visibility | 74 | 74 | 72 | 70 | 72 | 77 |
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. |
