Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 775 | 698 | 774 | 773 | 804 | 779 |
| Tmin | 775 | 700 | 774 | 772 | 804 | 776 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 682 | 616 | 682 | 686 | 713 | 690 |
| Humidity/Visibility | 92 | 83 | 92 | 113 | 122 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 801 | 803 | 779 | 785 | 779 | 805 |
| Tmin | 803 | 806 | 777 | 787 | 777 | 801 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 714 | 714 | 691 | 712 | 690 | 713 |
| Humidity/Visibility | 122 | 122 | 118 | 107 | 119 | 123 |
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. |
