Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 471 | 450 | 496 | 477 | 473 | 479 |
| Tmin | 472 | 448 | 496 | 480 | 477 | 479 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 66 | 58 | 66 | 62 | 62 | 63 |
| Humidity/Visibility | 61 | 54 | 60 | 59 | 56 | 57 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 496 | 494 | 477 | 515 | 506 | 515 |
| Tmin | 496 | 494 | 477 | 515 | 505 | 527 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 63 | 69 | 64 | 99 | 92 | 96 |
| Humidity/Visibility | 61 | 60 | 62 | 83 | 86 | 90 |
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. |
