Humidity vs Latitude

I do not believe there is a trend you can really infer from this plot. From my understanding, the conclusion I come to is as follows; because humditiy is relative to vapour pressure, and the presence of vapour pressure is mostly* independent on from hemisphere on a linear scale, it makes sense that there is no linear relationship observed. While humdity is related to temperature, that relation is a scale of how much humidity can be present based on a given temperature, and is not related to its genesis, or generation, only how much can be generated.

*There is a minor relationship based on the landmass size and ocean size of each hemisphere but seemingly not a strong enough one to majorly affect the outcomes of the locations used in this dataset