Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1940 | 1753 | 1937 | 1877 | 1927 | 1877 |
| Tmin | 1943 | 1761 | 1947 | 1876 | 1926 | 1881 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 187 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 176 | 160 | 176 | 170 | 173 | 170 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1940 | 1943 | 1906 | 1969 | 1910 | 1975 |
| Tmin | 1948 | 1947 | 1911 | 1971 | 1916 | 1976 |
| Duration of sunshine | 124 | 124 | 90 | 124 | 60 | 31 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 171 | 175 | 194 | 201 | 205 | 214 |
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. |
