Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 425 | 380 | 431 | 416 | 432 | 420 |
| Tmin | 430 | 382 | 428 | 418 | 431 | 415 |
| Duration of sunshine | 429 | 354 | 428 | 417 | 462 | 413 |
| Precipitation | 192 | 180 | 199 | 185 | 188 | 188 |
| Humidity/Visibility | 180 | 157 | 183 | 177 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 427 | 432 | 443 | 449 | 428 | 463 |
| Tmin | 429 | 433 | 445 | 451 | 430 | 460 |
| Duration of sunshine | 336 | 432 | 475 | 481 | 430 | 430 |
| Precipitation | 185 | 197 | 216 | 224 | 213 | 227 |
| Humidity/Visibility | 181 | 183 | 204 | 205 | 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. |
