Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1208 | 1144 | 1261 | 1226 | 1243 | 1223 |
| Tmin | 1116 | 1057 | 1169 | 1137 | 1170 | 1152 |
| Duration of sunshine | 248 | 226 | 217 | 270 | 310 | 270 |
| Precipitation | 186 | 171 | 187 | 181 | 188 | 180 |
| Humidity/Visibility | 152 | 137 | 148 | 152 | 154 | 146 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1263 | 1261 | 1224 | 1287 | 1256 | 1265 |
| Tmin | 1188 | 1190 | 1140 | 1201 | 1194 | 1184 |
| Duration of sunshine | 310 | 279 | 270 | 310 | 270 | 155 |
| Precipitation | 190 | 187 | 209 | 219 | 210 | 197 |
| Humidity/Visibility | 150 | 147 | 171 | 171 | 176 | 167 |
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. |
