Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 891 | 809 | 886 | 862 | 891 | 856 |
| Tmin | 776 | 700 | 776 | 750 | 775 | 752 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 113 | 129 | 125 | 124 | 120 |
| Humidity/Visibility | 113 | 109 | 116 | 110 | 117 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 862 | 855 | 832 | 858 | 833 | 860 |
| Tmin | 776 | 776 | 751 | 777 | 750 | 777 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 128 | 127 | 125 | 125 | 127 |
| Humidity/Visibility | 117 | 115 | 111 | 111 | 109 | 114 |
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. |
