Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 872 | 814 | 908 | 856 | 826 | 847 |
| Tmin | 715 | 679 | 722 | 698 | 683 | 700 |
| Duration of sunshine | 155 | 169 | 155 | 120 | 155 | 120 |
| Precipitation | 171 | 147 | 173 | 165 | 168 | 166 |
| Humidity/Visibility | 104 | 95 | 112 | 112 | 110 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 872 | 862 | 840 | 953 | 906 | 861 |
| Tmin | 728 | 719 | 714 | 820 | 790 | 725 |
| Duration of sunshine | 217 | 186 | 210 | 217 | 180 | 124 |
| Precipitation | 185 | 187 | 199 | 211 | 207 | 185 |
| Humidity/Visibility | 127 | 122 | 125 | 138 | 130 | 121 |
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. |
