Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 821 | 750 | 827 | 800 | 830 | 808 |
| Tmin | 827 | 748 | 827 | 801 | 831 | 805 |
| Duration of sunshine | 155 | 112 | 186 | 180 | 217 | 270 |
| Precipitation | 186 | 172 | 190 | 183 | 188 | 182 |
| Humidity/Visibility | 182 | 164 | 177 | 173 | 181 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 825 | 824 | 817 | 842 | 831 | 859 |
| Tmin | 832 | 828 | 814 | 842 | 834 | 862 |
| Duration of sunshine | 155 | 124 | 210 | 279 | 180 | 186 |
| Precipitation | 186 | 190 | 212 | 212 | 210 | 216 |
| Humidity/Visibility | 181 | 179 | 199 | 199 | 205 | 210 |
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. |
