Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 446 | 398 | 446 | 447 | 462 | 455 |
| Tmin | 457 | 412 | 462 | 449 | 461 | 458 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 59 | 63 | 62 | 67 | 75 |
| Humidity/Visibility | 59 | 47 | 55 | 57 | 60 | 68 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 488 | 477 | 474 | 489 | 462 | 483 |
| Tmin | 482 | 479 | 472 | 486 | 465 | 490 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 98 | 95 | 103 | 99 | 92 | 99 |
| Humidity/Visibility | 86 | 78 | 82 | 81 | 74 | 89 |
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. |
