Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 706 | 636 | 702 | 683 | 711 | 684 |
| Tmin | 574 | 519 | 576 | 565 | 579 | 556 |
| Duration of sunshine | 248 | 226 | 217 | 270 | 279 | 300 |
| Precipitation | 155 | 141 | 157 | 151 | 155 | 150 |
| Humidity/Visibility | 136 | 125 | 134 | 131 | 138 | 130 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 703 | 703 | 684 | 705 | 673 | 681 |
| Tmin | 575 | 582 | 563 | 584 | 578 | 564 |
| Duration of sunshine | 248 | 310 | 300 | 248 | 300 | 279 |
| Precipitation | 157 | 159 | 152 | 153 | 147 | 131 |
| Humidity/Visibility | 133 | 136 | 131 | 131 | 121 | 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. |
