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Output variables can be generated at different reporting frequencies. It looks like you have generated outdoor air drybulb temperatures at a monthly frequency (blue line), which is why there are less values to plot than the zone air temperature at an hourly frequency (orange line). See more discussion in another Unmet Hours post here.

If you didn't explicitly request monthly outdoor air drybulb output variables in the Output Variables tab of the OpenStudio application, then you are likely applying a measure to your simulation that is adding that.