Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 679 | 615 | 680 | 655 | 681 | 657 |
| Tmin | 682 | 614 | 681 | 659 | 681 | 656 |
| Duration of sunshine | 62 | 54 | 48 | 40 | 36 | 38 |
| Precipitation | 589 | 532 | 589 | 570 | 589 | 570 |
| Humidity/Visibility | 0 | 0 | 0 | 0 | 0 | 0 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 674 | 701 | 678 | 699 | 660 | 683 |
| Tmin | 676 | 699 | 681 | 700 | 660 | 683 |
| Duration of sunshine | 27 | 26 | 36 | 35 | 39 | 53 |
| Precipitation | 589 | 589 | 570 | 589 | 570 | 589 |
| Humidity/Visibility | 0 | 0 | 0 | 0 | 0 | 0 |
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. |
