Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1899 | 1719 | 1891 | 1830 | 1891 | 1830 |
| Tmin | 1899 | 1719 | 1891 | 1830 | 1891 | 1830 |
| Duration of sunshine | 1301 | 1183 | 1302 | 1259 | 1301 | 1257 |
| Precipitation | 188 | 168 | 187 | 183 | 186 | 181 |
| Humidity/Visibility | 185 | 166 | 185 | 179 | 185 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1891 | 1891 | 1830 | 1891 | 1830 | 1891 |
| Tmin | 1891 | 1891 | 1830 | 1891 | 1830 | 1891 |
| Duration of sunshine | 1301 | 1305 | 1289 | 1325 | 1288 | 1332 |
| Precipitation | 189 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 184 | 184 | 207 | 209 | 206 | 215 |
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. |
