Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1255 | 1150 | 1271 | 1229 | 1268 | 1229 |
| Tmin | 1254 | 1150 | 1271 | 1229 | 1269 | 1229 |
| Duration of sunshine | 398 | 364 | 432 | 449 | 368 | 419 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 183 | 168 | 185 | 179 | 184 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1267 | 1271 | 1252 | 1293 | 1256 | 1302 |
| Tmin | 1267 | 1271 | 1253 | 1295 | 1259 | 1302 |
| Duration of sunshine | 423 | 465 | 444 | 454 | 447 | 464 |
| Precipitation | 185 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 181 | 185 | 207 | 209 | 207 | 215 |
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. |
