Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 706 | 639 | 712 | 711 | 739 | 712 |
| Tmin | 710 | 641 | 710 | 711 | 740 | 714 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 713 | 644 | 713 | 716 | 744 | 723 |
| Humidity/Visibility | 122 | 111 | 121 | 143 | 152 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 738 | 741 | 716 | 730 | 710 | 739 |
| Tmin | 739 | 736 | 712 | 732 | 712 | 739 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 748 | 748 | 721 | 740 | 720 | 746 |
| Humidity/Visibility | 152 | 150 | 148 | 147 | 147 | 153 |
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. |
