'How to evenly spread out date data (pandas)

I'm working on a project and I'm struggling with some formats of dataframes. I have two dataframes, each containing a different number of months. I want all the months of 2013 (so 2013-01, 2013-02 ... 2013-12), which is in the second picture. I want to compare them to the storage_monhty in the first picture. However, the dates in the storage dataframe are not evenly spread, and there are less (9 months vs 12 months). Is there a way that I can add 3 months and interpolate the corresponding data to the 'standard' format of 2013-01 etc? Thank you in advance!

https://imgur.com/gallery/1Aw1AWg



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