Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1721 | 1557 | 1726 | 1690 | 1734 | 1693 |
| Tmin | 1726 | 1564 | 1728 | 1687 | 1736 | 1699 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 155 | 141 | 156 | 172 | 186 | 180 |
| Humidity/Visibility | 154 | 139 | 153 | 167 | 181 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1741 | 1747 | 1695 | 1757 | 1701 | 1761 |
| Tmin | 1755 | 1750 | 1706 | 1758 | 1706 | 1758 |
| Duration of sunshine | 155 | 93 | 90 | 93 | 60 | 62 |
| Precipitation | 187 | 189 | 181 | 184 | 194 | 203 |
| Humidity/Visibility | 181 | 181 | 177 | 179 | 186 | 193 |
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. |
