average annual precipitation
state wide averages of annual rainfall plus snowfall range from a high of 63 7 inches 1618 millimetres in hawaii to a low of 9 5 inches 241 millimetres in nevadafor the entire united states excluding hawaii and alaska the average amount of moisture falling as rain and snow is 30 21 inches 767 millimetresow much precipitation each state in the us gets on average in a year is listed below the states are also ranked from the wettest state at number 1 to the driest state at number 50