Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 272 | 246 | 264 | 292 | 297 | 291 |
| Tmin | 401 | 359 | 393 | 414 | 426 | 414 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 92 | 102 | 131 | 138 | 124 |
| Humidity/Visibility | 66 | 59 | 63 | 83 | 84 | 83 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 290 | 298 | 287 | 294 | 287 | 291 |
| Tmin | 424 | 431 | 416 | 424 | 407 | 426 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 133 | 136 | 124 | 126 | 126 | 130 |
| Humidity/Visibility | 82 | 85 | 83 | 81 | 81 | 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. |
