Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1751 | 1588 | 1756 | 1698 | 1749 | 1698 |
| Tmin | 1755 | 1590 | 1756 | 1700 | 1744 | 1693 |
| Duration of sunshine | 93 | 86 | 93 | 90 | 155 | 150 |
| Precipitation | 155 | 141 | 156 | 151 | 155 | 150 |
| Humidity/Visibility | 149 | 138 | 151 | 148 | 150 | 145 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1753 | 1751 | 1687 | 1781 | 1726 | 1788 |
| Tmin | 1744 | 1743 | 1692 | 1775 | 1734 | 1788 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 155 | 157 | 152 | 184 | 180 | 187 |
| Humidity/Visibility | 147 | 146 | 142 | 173 | 171 | 183 |
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. |
