Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 711 | 642 | 711 | 709 | 742 | 719 |
| Tmin | 710 | 644 | 712 | 704 | 741 | 717 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 73 | 61 | 95 | 149 | 150 | 146 |
| Humidity/Visibility | 43 | 40 | 73 | 71 | 71 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 729 | 702 | 703 | 738 | 719 | 744 |
| Tmin | 730 | 702 | 699 | 737 | 720 | 737 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 136 | 112 | 125 | 119 | 124 | 104 |
| Humidity/Visibility | 59 | 54 | 73 | 70 | 71 | 74 |
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. |
