Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 491 | 442 | 489 | 474 | 490 | 474 |
| Tmin | 486 | 442 | 491 | 477 | 490 | 480 |
| Duration of sunshine | 47 | 46 | 53 | 52 | 53 | 58 |
| Precipitation | 123 | 112 | 124 | 120 | 124 | 120 |
| Humidity/Visibility | 47 | 45 | 49 | 47 | 51 | 48 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 491 | 485 | 452 | 464 | 451 | 462 |
| Tmin | 490 | 486 | 453 | 462 | 450 | 463 |
| Duration of sunshine | 55 | 49 | 32 | 28 | 27 | 27 |
| Precipitation | 124 | 122 | 96 | 89 | 120 | 124 |
| Humidity/Visibility | 50 | 47 | 30 | 27 | 31 | 26 |
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. |
