Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 739 | 671 | 739 | 744 | 770 | 742 |
| Tmin | 705 | 644 | 705 | 714 | 744 | 716 |
| Duration of sunshine | 217 | 168 | 248 | 180 | 217 | 270 |
| Precipitation | 100 | 87 | 97 | 125 | 124 | 121 |
| Humidity/Visibility | 90 | 84 | 90 | 117 | 121 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 764 | 765 | 736 | 767 | 742 | 766 |
| Tmin | 732 | 733 | 704 | 736 | 696 | 709 |
| Duration of sunshine | 217 | 248 | 210 | 155 | 180 | 186 |
| Precipitation | 126 | 125 | 131 | 123 | 122 | 126 |
| Humidity/Visibility | 121 | 120 | 115 | 115 | 118 | 122 |
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. |
