Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 775 | 701 | 774 | 749 | 775 | 750 |
| Tmin | 803 | 728 | 801 | 772 | 799 | 769 |
| Duration of sunshine | 371 | 364 | 401 | 357 | 372 | 416 |
| Precipitation | 155 | 141 | 154 | 151 | 155 | 150 |
| Humidity/Visibility | 137 | 124 | 135 | 132 | 135 | 130 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 774 | 772 | 750 | 769 | 750 | 775 |
| Tmin | 795 | 800 | 775 | 799 | 777 | 780 |
| Duration of sunshine | 398 | 429 | 416 | 420 | 358 | 245 |
| Precipitation | 158 | 156 | 150 | 152 | 152 | 129 |
| Humidity/Visibility | 135 | 136 | 132 | 132 | 131 | 125 |
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. |
