Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 183 | 158 | 185 | 177 | 182 | 179 |
| Tmin | 185 | 167 | 184 | 179 | 184 | 177 |
| Duration of sunshine | 463 | 386 | 461 | 445 | 493 | 474 |
| Precipitation | 186 | 180 | 187 | 181 | 186 | 182 |
| Humidity/Visibility | 183 | 162 | 185 | 179 | 184 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 176 | 183 | 207 | 205 | 189 | 215 |
| Tmin | 180 | 188 | 208 | 209 | 193 | 215 |
| Duration of sunshine | 490 | 464 | 508 | 512 | 491 | 493 |
| Precipitation | 185 | 196 | 210 | 222 | 210 | 217 |
| Humidity/Visibility | 181 | 184 | 206 | 206 | 205 | 215 |
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. |
