Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 372 | 337 | 372 | 374 | 403 | 387 |
| Tmin | 372 | 335 | 368 | 375 | 402 | 389 |
| Duration of sunshine | 247 | 282 | 306 | 314 | 369 | 329 |
| Precipitation | 64 | 57 | 63 | 75 | 93 | 91 |
| Humidity/Visibility | 61 | 56 | 60 | 74 | 91 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 402 | 399 | 388 | 399 | 387 | 403 |
| Tmin | 399 | 401 | 387 | 396 | 390 | 401 |
| Duration of sunshine | 335 | 368 | 385 | 364 | 328 | 338 |
| Precipitation | 96 | 94 | 90 | 90 | 90 | 95 |
| Humidity/Visibility | 91 | 91 | 88 | 86 | 88 | 92 |
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. |
