Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1248 | 1146 | 1270 | 1227 | 1262 | 1228 |
| Tmin | 1248 | 1141 | 1266 | 1226 | 1266 | 1222 |
| Duration of sunshine | 272 | 243 | 306 | 291 | 304 | 287 |
| Precipitation | 186 | 171 | 189 | 180 | 188 | 180 |
| Humidity/Visibility | 183 | 165 | 184 | 178 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1261 | 1264 | 1252 | 1290 | 1248 | 1285 |
| Tmin | 1268 | 1270 | 1249 | 1291 | 1254 | 1291 |
| Duration of sunshine | 270 | 273 | 291 | 325 | 323 | 330 |
| Precipitation | 185 | 198 | 214 | 219 | 211 | 227 |
| Humidity/Visibility | 181 | 183 | 206 | 208 | 202 | 208 |
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. |
