Sometimes there might be a scenario where you'd have conflicting axis types and can't put all the series into the same plot area. In this situation you can add a 2nd chart, make the background transparent and layer it on top of the other chart (e.g., put the line series on top of the combined bar series).
However, since it looks like you can share the horizontal axis between all 3 series, you shouldn't won't need to do this. all three series data shares the same horizontal categorical axis.
Regards,
Lance | Manager Technical Support
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I also need to make a quick correction about the combining of vertical axes. The combined vertical axes are not available on every platform.
Although you can move the temperature vertical axis to the right (with LinearAxis HorizontalLocation=Right), you won't be able to use it in the same plot area as the left vertical axis.
So, you will need to follow my guidance about layering 2 charts. You can make the horizontal labels and background of the extra chart transparent. That way, you only see the series and the vertical axis.
For example:
<Grid><!-- The bottom chart, this one is for the combined BarSeries (use Cluster mode)--><telerikChart:RadCartesianChart><!-- Use this one for the line series, make the background color and horizontal axis labels transparent --><telerikChart:RadCartesianChart></Grid>