Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1231 | 1131 | 1250 | 1211 | 1241 | 1213 |
| Tmin | 1221 | 1134 | 1239 | 1212 | 1237 | 1213 |
| Duration of sunshine | 314 | 317 | 340 | 369 | 347 | 311 |
| Precipitation | 214 | 190 | 208 | 193 | 194 | 190 |
| Humidity/Visibility | 167 | 150 | 166 | 167 | 164 | 165 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1252 | 1250 | 1232 | 1280 | 1230 | 1267 |
| Tmin | 1255 | 1253 | 1220 | 1274 | 1233 | 1270 |
| Duration of sunshine | 389 | 445 | 453 | 404 | 426 | 397 |
| Precipitation | 200 | 200 | 236 | 227 | 224 | 253 |
| Humidity/Visibility | 169 | 169 | 190 | 192 | 184 | 185 |
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. |
