Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 566 | 507 | 558 | 540 | 566 | 569 |
| Tmin | 575 | 520 | 563 | 550 | 582 | 574 |
| Duration of sunshine | 45 | 42 | 36 | 40 | 52 | 56 |
| Precipitation | 73 | 67 | 75 | 84 | 91 | 117 |
| Humidity/Visibility | 42 | 38 | 37 | 36 | 48 | 55 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 587 | 588 | 550 | 588 | 563 | 590 |
| Tmin | 593 | 596 | 569 | 597 | 568 | 592 |
| Duration of sunshine | 67 | 66 | 57 | 68 | 57 | 64 |
| Precipitation | 126 | 122 | 108 | 119 | 121 | 123 |
| Humidity/Visibility | 63 | 61 | 52 | 56 | 53 | 62 |
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. |
