Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1244 | 1143 | 1260 | 1217 | 1260 | 1213 |
| Tmin | 1250 | 1146 | 1263 | 1218 | 1258 | 1212 |
| Duration of sunshine | 463 | 363 | 426 | 385 | 494 | 474 |
| Precipitation | 186 | 169 | 186 | 183 | 188 | 180 |
| Humidity/Visibility | 185 | 168 | 185 | 179 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1254 | 1261 | 1240 | 1266 | 1236 | 1294 |
| Tmin | 1258 | 1262 | 1235 | 1282 | 1249 | 1295 |
| Duration of sunshine | 483 | 496 | 456 | 477 | 470 | 519 |
| Precipitation | 186 | 190 | 213 | 228 | 215 | 219 |
| Humidity/Visibility | 183 | 185 | 206 | 206 | 205 | 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. |
