Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 658 | 602 | 670 | 641 | 662 | 644 |
| Tmin | 589 | 534 | 589 | 571 | 589 | 571 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 135 | 121 | 126 | 119 | 127 | 124 |
| Humidity/Visibility | 54 | 64 | 66 | 54 | 59 | 61 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 655 | 671 | 646 | 666 | 637 | 655 |
| Tmin | 590 | 589 | 571 | 590 | 570 | 592 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 137 | 122 | 119 | 136 | 139 |
| Humidity/Visibility | 56 | 59 | 59 | 56 | 53 | 48 |
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. |
