Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1254 | 1146 | 1267 | 1228 | 1261 | 1228 |
| Tmin | 1256 | 1150 | 1265 | 1226 | 1266 | 1227 |
| Duration of sunshine | 337 | 353 | 390 | 352 | 400 | 384 |
| Precipitation | 188 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 167 | 185 | 177 | 184 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1264 | 1265 | 1241 | 1291 | 1252 | 1291 |
| Tmin | 1266 | 1272 | 1250 | 1289 | 1253 | 1294 |
| Duration of sunshine | 367 | 368 | 383 | 364 | 352 | 392 |
| Precipitation | 186 | 190 | 212 | 217 | 212 | 217 |
| Humidity/Visibility | 183 | 184 | 202 | 208 | 206 | 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. |
