Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 330 | 303 | 334 | 356 | 364 | 356 |
| Tmin | 461 | 418 | 461 | 475 | 494 | 476 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 101 | 96 | 100 | 130 | 126 | 125 |
| Humidity/Visibility | 66 | 60 | 65 | 87 | 88 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 359 | 368 | 353 | 365 | 346 | 359 |
| Tmin | 490 | 495 | 477 | 487 | 467 | 493 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 130 | 123 | 123 | 128 | 135 |
| Humidity/Visibility | 84 | 89 | 85 | 85 | 80 | 85 |
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. |
