Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1247 | 1149 | 1267 | 1225 | 1266 | 1228 |
| Tmin | 1252 | 1150 | 1268 | 1228 | 1267 | 1226 |
| Duration of sunshine | 433 | 335 | 427 | 445 | 460 | 472 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 185 | 168 | 184 | 179 | 184 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1268 | 1269 | 1258 | 1293 | 1253 | 1300 |
| Tmin | 1269 | 1271 | 1256 | 1297 | 1257 | 1302 |
| Duration of sunshine | 426 | 449 | 469 | 481 | 383 | 522 |
| Precipitation | 186 | 192 | 212 | 215 | 210 | 219 |
| Humidity/Visibility | 183 | 184 | 206 | 209 | 206 | 216 |
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. |
