Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1425 | 1288 | 1426 | 1378 | 1424 | 1380 |
| Tmin | 1425 | 1286 | 1424 | 1379 | 1426 | 1376 |
| Duration of sunshine | 185 | 165 | 183 | 176 | 182 | 170 |
| Precipitation | 186 | 169 | 188 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 167 | 184 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1418 | 1425 | 1408 | 1450 | 1406 | 1456 |
| Tmin | 1418 | 1427 | 1407 | 1449 | 1406 | 1451 |
| Duration of sunshine | 175 | 187 | 206 | 204 | 205 | 211 |
| Precipitation | 184 | 190 | 212 | 215 | 210 | 217 |
| Humidity/Visibility | 179 | 185 | 207 | 208 | 205 | 213 |
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. |
