Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 370 | 336 | 369 | 375 | 401 | 388 |
| Tmin | 369 | 335 | 370 | 375 | 401 | 389 |
| Duration of sunshine | 276 | 309 | 337 | 342 | 400 | 358 |
| Precipitation | 63 | 57 | 63 | 77 | 94 | 91 |
| Humidity/Visibility | 61 | 56 | 61 | 74 | 91 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 399 | 396 | 386 | 398 | 386 | 403 |
| Tmin | 399 | 400 | 386 | 395 | 387 | 403 |
| Duration of sunshine | 367 | 398 | 354 | 391 | 267 | 246 |
| Precipitation | 97 | 95 | 90 | 92 | 91 | 93 |
| Humidity/Visibility | 91 | 88 | 87 | 85 | 88 | 93 |
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. |
