Latitude vs Humidity

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I expected cities near the equator to have the most humidity but that wasn't true. Overall the northern hemisphere is more humid than the south. The graph shows a cluster of the cities with the highest are near or on the Artic ocean in Russia, Greenland and Canada. When I looked into why I discovered that Artic humidity is the result of global warming. It has been rising since the glaciers started melting. The warmer air on the ice does not generate humidity but when the warmer air meets the water it does. The rising water vapor contributes to humid conditions and accelerates the rate of melting near the Artic circle. The more open surface water there is the more humidity there will be so it's a dangerous cycle.