Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 420 | 366 | 415 | 437 | 449 | 426 |
| Tmin | 423 | 387 | 426 | 441 | 460 | 430 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 103 | 95 | 101 | 134 | 129 | 126 |
| Humidity/Visibility | 64 | 55 | 62 | 83 | 86 | 74 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 429 | 449 | 432 | 446 | 433 | 451 |
| Tmin | 445 | 460 | 446 | 451 | 436 | 461 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 133 | 126 | 126 | 136 | 127 |
| Humidity/Visibility | 75 | 84 | 82 | 81 | 79 | 87 |
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. |
