Climate of North Dakota Climate of North Dakota Relative Relative humidity is the most commonly used measure of atmospheric moisture. Relative humidity is the ratio of the actual amount of moisture in the air to the amount of moisture that the air could hold if saturated at that temperature. The amount of moisture that air can hold depends upon temperature.
Warm air can hold more moisture than cold air.
Large daily changes in relative humidity can take place without any change in absolute moisture content of the air. Because of this temperature influence, relative humidity is lowest during the warmest portion of the day and highest during the coolest hours of night and very early morning. Comparison of average relative humidity data at six-hour intervals in Table 8 shows that the eastern areas of the state are more humid than the western areas. Average realtive humidity by month and for year at hour indicated at four locations in North Dakota.