Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 589 | 531 | 600 | 593 | 615 | 599 |
| Tmin | 586 | 533 | 598 | 595 | 616 | 597 |
| Duration of sunshine | 186 | 225 | 217 | 180 | 186 | 210 |
| Precipitation | 96 | 85 | 107 | 125 | 126 | 121 |
| Humidity/Visibility | 89 | 83 | 101 | 115 | 120 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 613 | 615 | 597 | 614 | 598 | 618 |
| Tmin | 616 | 616 | 593 | 616 | 589 | 614 |
| Duration of sunshine | 93 | 186 | 180 | 248 | 150 | 155 |
| Precipitation | 127 | 128 | 120 | 124 | 124 | 125 |
| Humidity/Visibility | 119 | 118 | 116 | 115 | 112 | 121 |
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. |
