Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 726 | 649 | 726 | 729 | 762 | 734 |
| Tmin | 739 | 671 | 736 | 741 | 769 | 739 |
| Duration of sunshine | 248 | 225 | 186 | 210 | 186 | 270 |
| Precipitation | 93 | 87 | 98 | 126 | 124 | 126 |
| Humidity/Visibility | 88 | 79 | 82 | 111 | 115 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 757 | 759 | 729 | 747 | 735 | 763 |
| Tmin | 765 | 764 | 745 | 761 | 740 | 770 |
| Duration of sunshine | 186 | 217 | 210 | 217 | 210 | 217 |
| Precipitation | 131 | 130 | 122 | 122 | 126 | 129 |
| Humidity/Visibility | 117 | 116 | 113 | 112 | 111 | 119 |
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. |
