Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 533 | 497 | 555 | 557 | 581 | 568 |
| Tmin | 532 | 502 | 555 | 560 | 580 | 563 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 125 | 112 | 124 | 149 | 154 | 150 |
| Humidity/Visibility | 121 | 111 | 122 | 141 | 153 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 585 | 583 | 564 | 577 | 564 | 584 |
| Tmin | 583 | 583 | 565 | 578 | 564 | 581 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 156 | 156 | 151 | 152 | 151 | 156 |
| Humidity/Visibility | 152 | 150 | 147 | 148 | 147 | 152 |
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. |
