Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 710 | 640 | 713 | 689 | 712 | 689 |
| Tmin | 712 | 642 | 712 | 688 | 713 | 688 |
| Duration of sunshine | 31 | 26 | 31 | 30 | 31 | 29 |
| Precipitation | 682 | 616 | 682 | 661 | 682 | 660 |
| Humidity/Visibility | 184 | 167 | 185 | 179 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 711 | 712 | 714 | 734 | 716 | 742 |
| Tmin | 712 | 715 | 717 | 735 | 717 | 740 |
| Duration of sunshine | 31 | 33 | 57 | 62 | 60 | 56 |
| Precipitation | 682 | 686 | 694 | 711 | 690 | 717 |
| Humidity/Visibility | 184 | 185 | 205 | 210 | 207 | 211 |
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. |
