As it shows on the picture, there is no significant relation between the Latitude and the Humdity. If we look closer, higher humidity is more condensed in the northern hemisphere compare to the southern. One of the reason could be that at this time of the year in the north the weather is going from winter to spring and usually it rains a lot, on the other hand in the south is summer going to fall and it is not that rainy yet..

Visualizations