Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 836 | 752 | 832 | 806 | 833 | 806 |
| Tmin | 835 | 754 | 833 | 808 | 837 | 808 |
| Duration of sunshine | 122 | 108 | 118 | 101 | 106 | 107 |
| Precipitation | 806 | 728 | 807 | 780 | 806 | 780 |
| Humidity/Visibility | 184 | 166 | 183 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 835 | 834 | 833 | 860 | 833 | 865 |
| Tmin | 836 | 835 | 831 | 860 | 835 | 864 |
| Duration of sunshine | 127 | 128 | 132 | 129 | 146 | 151 |
| Precipitation | 806 | 810 | 812 | 835 | 810 | 217 |
| Humidity/Visibility | 184 | 183 | 205 | 210 | 205 | 214 |
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. |
