Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1979 | 1786 | 1999 | 1946 | 1994 | 1941 |
| Tmin | 1948 | 1761 | 1948 | 1886 | 1947 | 1911 |
| Duration of sunshine | 155 | 142 | 124 | 150 | 186 | 210 |
| Precipitation | 124 | 113 | 147 | 151 | 155 | 150 |
| Humidity/Visibility | 106 | 96 | 116 | 117 | 127 | 131 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2008 | 2005 | 1942 | 1999 | 1935 | 1981 |
| Tmin | 1978 | 1971 | 1916 | 1969 | 1905 | 1977 |
| Duration of sunshine | 217 | 217 | 210 | 217 | 150 | 186 |
| Precipitation | 158 | 158 | 150 | 153 | 152 | 129 |
| Humidity/Visibility | 134 | 137 | 132 | 132 | 129 | 124 |
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. |
