Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 498 | 437 | 498 | 469 | 484 | 487 |
| Tmin | 502 | 451 | 507 | 469 | 495 | 487 |
| Duration of sunshine | 346 | 277 | 349 | 348 | 297 | 304 |
| Precipitation | 162 | 137 | 173 | 158 | 168 | 163 |
| Humidity/Visibility | 95 | 82 | 95 | 82 | 86 | 91 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 495 | 492 | 492 | 509 | 477 | 516 |
| Tmin | 500 | 490 | 509 | 518 | 484 | 533 |
| Duration of sunshine | 379 | 330 | 418 | 320 | 327 | 398 |
| Precipitation | 172 | 177 | 200 | 202 | 192 | 195 |
| Humidity/Visibility | 94 | 90 | 102 | 100 | 87 | 115 |
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. |
