Average precipitation has increased by 4% since 1901 across the United States. Precipitation is increasing on average because as the temperatures rise, there is more evaporation, which leads to more moisture in the air. That moisture in the air has to come down as precipitation, therefore leading to increased precipitation. However, this increased evaporation will also dry some land. That means in areas where precipitation is already common, there will be increased precipitation because the excess precipitation will fall. In drier areas, it will be even drier because of the increased precipitation, leading to increased risks of droughts, as previously mentioned.