Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 180 | 165 | 183 | 175 | 183 | 177 |
| Tmin | 182 | 166 | 185 | 177 | 185 | 174 |
| Duration of sunshine | 248 | 198 | 217 | 210 | 186 | 180 |
| Precipitation | 188 | 169 | 187 | 181 | 186 | 182 |
| Humidity/Visibility | 184 | 167 | 185 | 179 | 185 | 179 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 181 | 182 | 206 | 203 | 205 | 207 |
| Tmin | 183 | 187 | 207 | 208 | 206 | 207 |
| Duration of sunshine | 217 | 186 | 240 | 279 | 240 | 217 |
| Precipitation | 186 | 196 | 214 | 215 | 212 | 217 |
| Humidity/Visibility | 184 | 184 | 204 | 207 | 206 | 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. |
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