Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 827 | 785 | 856 | 837 | 854 | 823 |
| Tmin | 828 | 785 | 862 | 836 | 857 | 835 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 82 | 113 | 119 | 112 | 121 | 111 |
| Humidity/Visibility | 68 | 76 | 85 | 84 | 85 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 857 | 853 | 828 | 861 | 837 | 868 |
| Tmin | 857 | 854 | 831 | 863 | 839 | 867 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 97 | 92 | 91 | 123 | 106 |
| Humidity/Visibility | 85 | 79 | 88 | 87 | 88 | 92 |
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. |
