Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 528 | 489 | 540 | 530 | 538 | 525 |
| Tmin | 512 | 477 | 523 | 517 | 522 | 504 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 92 | 97 | 95 | 101 | 94 |
| Humidity/Visibility | 46 | 54 | 59 | 65 | 61 | 58 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 510 | 507 | 501 | 534 | 543 | 558 |
| Tmin | 505 | 504 | 490 | 519 | 523 | 547 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 95 | 90 | 106 | 120 | 133 |
| Humidity/Visibility | 35 | 37 | 48 | 58 | 79 | 83 |
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. |
