Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 330 | 305 | 330 | 327 | 332 | 338 |
| Tmin | 464 | 418 | 460 | 448 | 464 | 459 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 94 | 97 | 97 | 96 | 108 |
| Humidity/Visibility | 67 | 60 | 65 | 65 | 66 | 73 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 359 | 368 | 354 | 364 | 349 | 360 |
| Tmin | 489 | 496 | 479 | 490 | 466 | 491 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 128 | 121 | 124 | 130 | 130 |
| Humidity/Visibility | 84 | 90 | 86 | 85 | 81 | 88 |
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. |
