Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 800 | 724 | 805 | 777 | 804 | 776 |
| Tmin | 803 | 727 | 804 | 778 | 804 | 779 |
| Duration of sunshine | 155 | 169 | 186 | 180 | 186 | 180 |
| Precipitation | 202 | 197 | 232 | 231 | 244 | 234 |
| Humidity/Visibility | 179 | 160 | 173 | 166 | 170 | 165 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 796 | 796 | 808 | 828 | 797 | 809 |
| Tmin | 796 | 795 | 807 | 824 | 795 | 807 |
| Duration of sunshine | 186 | 217 | 180 | 186 | 150 | 186 |
| Precipitation | 216 | 223 | 243 | 242 | 208 | 219 |
| Humidity/Visibility | 169 | 166 | 199 | 202 | 202 | 181 |
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. |
