Humidity

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There is no appreciable trend in relative humidity with respect to latitude. However, it should be noted that the perceived humidity (and partial pressure of water in the air) would be generally be much higher closer to the equator because the generally warmer air holds more water at equally high relative humidities.

Note: Despite sampling of data from random coordinates, there still exists bias towards island and coastal cities. This is because greater than 70% of the Earth is covered in water, and attempting to pull samples from oceans would result in sampling the closest coastal city. This would be even more significant in the Southern Hemisphere where there is less landmass. Removing redundant cities helps somewhat, but the effects may be visible in the data.

• About 50% of the sampled cities have over 80% relative humidity, which could be because coastal cities have higher humidity than landlocked cities.