Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 601 | 561 | 613 | 596 | 615 | 594 |
| Tmin | 599 | 559 | 614 | 598 | 615 | 589 |
| Duration of sunshine | 175 | 159 | 178 | 173 | 174 | 172 |
| Precipitation | 186 | 168 | 186 | 181 | 186 | 182 |
| Humidity/Visibility | 183 | 163 | 184 | 177 | 182 | 175 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 611 | 616 | 623 | 642 | 621 | 649 |
| Tmin | 617 | 620 | 624 | 643 | 622 | 649 |
| Duration of sunshine | 170 | 170 | 196 | 199 | 198 | 210 |
| Precipitation | 186 | 190 | 212 | 215 | 210 | 217 |
| Humidity/Visibility | 181 | 182 | 204 | 208 | 205 | 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. |
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