Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 461 | 418 | 462 | 455 | 485 | 476 |
| Tmin | 458 | 412 | 452 | 454 | 480 | 468 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 88 | 101 | 114 | 128 | 125 |
| Humidity/Visibility | 90 | 83 | 88 | 97 | 117 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 486 | 482 | 473 | 487 | 475 | 493 |
| Tmin | 478 | 471 | 466 | 478 | 469 | 484 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 136 | 124 | 129 | 133 | 134 |
| Humidity/Visibility | 114 | 107 | 112 | 114 | 113 | 120 |
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. |
