Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 801 | 727 | 801 | 774 | 802 | 788 |
| Tmin | 798 | 729 | 804 | 779 | 803 | 793 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 62 | 57 | 63 | 65 | 62 | 73 |
| Humidity/Visibility | 56 | 54 | 59 | 55 | 59 | 69 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 830 | 834 | 806 | 831 | 806 | 837 |
| Tmin | 829 | 834 | 805 | 831 | 806 | 836 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 95 | 90 | 91 | 92 | 98 |
| Humidity/Visibility | 89 | 88 | 85 | 85 | 83 | 89 |
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. |
