Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1264 | 1150 | 1261 | 1227 | 1265 | 1223 |
| Tmin | 1237 | 1124 | 1239 | 1198 | 1237 | 1197 |
| Duration of sunshine | 243 | 270 | 269 | 361 | 307 | 315 |
| Precipitation | 187 | 169 | 186 | 180 | 186 | 179 |
| Humidity/Visibility | 166 | 153 | 166 | 160 | 166 | 158 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1262 | 1267 | 1255 | 1290 | 1251 | 1271 |
| Tmin | 1239 | 1234 | 1227 | 1267 | 1223 | 1263 |
| Duration of sunshine | 356 | 418 | 433 | 443 | 299 | 313 |
| Precipitation | 187 | 189 | 209 | 215 | 212 | 191 |
| Humidity/Visibility | 162 | 167 | 189 | 193 | 189 | 184 |
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. |
