Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 485 | 467 | 514 | 517 | 531 | 524 |
| Tmin | 488 | 469 | 515 | 514 | 539 | 525 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 100 | 105 | 133 | 128 | 121 |
| Humidity/Visibility | 89 | 79 | 84 | 107 | 112 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 520 | 542 | 528 | 537 | 516 | 546 |
| Tmin | 524 | 548 | 531 | 535 | 519 | 551 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 126 | 120 | 121 | 129 | 130 |
| Humidity/Visibility | 109 | 117 | 115 | 111 | 108 | 116 |
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. |
