Something of a “Captain Obvious” answer, but it's more humid at the ocean because humidity is water in the air, and the ocean is the world's largest source of water in the air. read more
Relative humidity is used to forecast dew, cloud, precipitation, and fog formation. Since saturated air is not able to absorb any more water vapor, excess water vapor will condense into dew, fog, precipitation, and/or clouds. The saturation point of air occurs when the relative humidity is 100%. read more
Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity (which depends on the current air temperature). A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain. read more
The relative humidity is the amount of water vapor in the air relative to the maximum amount of water it can hold at this temperature. So if it is 50 degrees F and the relative humidity is 50% that means that the air is holding half of the maximum water vapor that it can hold at this air temperature. Warm air can hold more water vapor than cold air. read more