Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 479 | 450 | 493 | 478 | 466 | 480 |
| Tmin | 479 | 450 | 495 | 480 | 465 | 479 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 56 | 66 | 62 | 62 | 59 |
| Humidity/Visibility | 61 | 55 | 61 | 59 | 61 | 60 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 496 | 494 | 476 | 495 | 483 | 524 |
| Tmin | 493 | 496 | 477 | 491 | 488 | 526 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 63 | 63 | 62 | 63 | 68 | 93 |
| Humidity/Visibility | 61 | 61 | 59 | 61 | 67 | 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. |
