Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 595 | 530 | 597 | 581 | 578 | 551 |
| Tmin | 498 | 448 | 496 | 480 | 500 | 488 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 173 | 152 | 176 | 167 | 167 | 166 |
| Humidity/Visibility | 97 | 82 | 102 | 103 | 108 | 106 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 546 | 553 | 533 | 568 | 559 | 589 |
| Tmin | 498 | 498 | 483 | 496 | 480 | 496 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 187 | 182 | 203 | 188 | 181 | 198 |
| Humidity/Visibility | 93 | 99 | 94 | 111 | 111 | 117 |
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. |
