Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 887 | 812 | 896 | 868 | 896 | 870 |
| Tmin | 889 | 812 | 899 | 867 | 895 | 868 |
| Duration of sunshine | 174 | 149 | 173 | 172 | 177 | 166 |
| Precipitation | 372 | 339 | 372 | 361 | 372 | 360 |
| Humidity/Visibility | 185 | 166 | 183 | 175 | 184 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 895 | 896 | 897 | 922 | 897 | 923 |
| Tmin | 892 | 900 | 898 | 922 | 897 | 927 |
| Duration of sunshine | 169 | 176 | 190 | 190 | 193 | 206 |
| Precipitation | 372 | 376 | 392 | 401 | 390 | 405 |
| Humidity/Visibility | 181 | 184 | 205 | 208 | 206 | 212 |
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. |
