Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 738 | 667 | 739 | 739 | 762 | 742 |
| Tmin | 739 | 668 | 734 | 746 | 769 | 740 |
| Duration of sunshine | 188 | 197 | 248 | 210 | 248 | 240 |
| Precipitation | 96 | 88 | 98 | 125 | 127 | 122 |
| Humidity/Visibility | 90 | 83 | 91 | 115 | 119 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 758 | 765 | 738 | 767 | 744 | 760 |
| Tmin | 768 | 768 | 744 | 759 | 745 | 766 |
| Duration of sunshine | 187 | 186 | 210 | 186 | 151 | 186 |
| Precipitation | 126 | 126 | 124 | 128 | 122 | 129 |
| Humidity/Visibility | 120 | 119 | 116 | 114 | 116 | 120 |
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. |
