Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1226 | 1101 | 1249 | 1212 | 1255 | 1211 |
| Tmin | 1212 | 1095 | 1239 | 1199 | 1239 | 1199 |
| Duration of sunshine | 341 | 313 | 360 | 335 | 374 | 405 |
| Precipitation | 647 | 585 | 644 | 626 | 646 | 627 |
| Humidity/Visibility | 158 | 145 | 157 | 153 | 159 | 153 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1243 | 1253 | 1247 | 1283 | 1243 | 1269 |
| Tmin | 1232 | 1241 | 1228 | 1262 | 1225 | 1266 |
| Duration of sunshine | 420 | 393 | 398 | 435 | 368 | 421 |
| Precipitation | 648 | 653 | 659 | 680 | 657 | 188 |
| Humidity/Visibility | 157 | 160 | 184 | 187 | 184 | 181 |
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. |
