Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 834 | 750 | 835 | 805 | 827 | 808 |
| Tmin | 835 | 752 | 834 | 801 | 833 | 807 |
| Duration of sunshine | 275 | 246 | 276 | 260 | 273 | 263 |
| Precipitation | 186 | 170 | 186 | 187 | 186 | 180 |
| Humidity/Visibility | 182 | 165 | 183 | 177 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 835 | 832 | 834 | 860 | 832 | 865 |
| Tmin | 836 | 835 | 836 | 859 | 835 | 867 |
| Duration of sunshine | 269 | 260 | 283 | 298 | 322 | 329 |
| Precipitation | 186 | 192 | 212 | 215 | 218 | 219 |
| Humidity/Visibility | 183 | 182 | 204 | 209 | 204 | 213 |
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. |
