Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 732 | 661 | 732 | 741 | 765 | 743 |
| Tmin | 734 | 667 | 740 | 742 | 769 | 741 |
| Duration of sunshine | 187 | 169 | 250 | 271 | 279 | 210 |
| Precipitation | 104 | 91 | 99 | 128 | 128 | 125 |
| Humidity/Visibility | 85 | 78 | 86 | 112 | 116 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 760 | 762 | 741 | 761 | 743 | 760 |
| Tmin | 762 | 765 | 744 | 767 | 738 | 767 |
| Duration of sunshine | 186 | 248 | 240 | 279 | 210 | 248 |
| Precipitation | 130 | 131 | 120 | 130 | 135 | 133 |
| Humidity/Visibility | 117 | 116 | 112 | 106 | 111 | 118 |
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. |
