Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1248 | 1146 | 1270 | 1225 | 1248 | 1229 |
| Tmin | 1250 | 1147 | 1269 | 1227 | 1248 | 1222 |
| Duration of sunshine | 272 | 242 | 305 | 265 | 301 | 291 |
| Precipitation | 186 | 168 | 186 | 181 | 186 | 182 |
| Humidity/Visibility | 184 | 166 | 185 | 179 | 184 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1268 | 1267 | 1251 | 1292 | 1252 | 1284 |
| Tmin | 1266 | 1271 | 1252 | 1293 | 1251 | 1290 |
| Duration of sunshine | 298 | 303 | 288 | 291 | 321 | 328 |
| Precipitation | 186 | 190 | 212 | 215 | 212 | 218 |
| Humidity/Visibility | 183 | 185 | 205 | 210 | 206 | 210 |
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. |
