Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1959 | 1773 | 1981 | 1917 | 1968 | 1916 |
| Tmin | 1928 | 1749 | 1926 | 1857 | 1922 | 1887 |
| Duration of sunshine | 155 | 114 | 155 | 150 | 186 | 210 |
| Precipitation | 124 | 113 | 147 | 151 | 155 | 150 |
| Humidity/Visibility | 106 | 95 | 116 | 118 | 127 | 130 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1982 | 1971 | 1915 | 1980 | 1908 | 1955 |
| Tmin | 1950 | 1941 | 1889 | 1955 | 1879 | 1950 |
| Duration of sunshine | 217 | 155 | 150 | 155 | 120 | 155 |
| Precipitation | 158 | 158 | 150 | 153 | 152 | 129 |
| Humidity/Visibility | 135 | 137 | 131 | 131 | 130 | 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. |
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