Precipitation Climate of the United States



average precipitation



the characteristics of precipitation across united states differ across united states , possessions. late summer , fall extratropical cyclones bring majority of precipitation falls across western, southern, , southeast alaska annually. during fall, winter, , spring, pacific storm systems bring of hawaii , western united states of precipitation. of florida has subtropical monsoon rainfall pattern (wet summer , dry winter).


in central , upper eastern united states, precipitation evenly distributed throughout year, although summer rainfall increases 1 moves southeastward. lake-effect snows add precipitation potential downwind of great lakes, great salt lake , finger lakes during cold season. average snow liquid ratio across contiguous united states 13:1, meaning 13 inches (330 mm) of snow melts down 1 inch (25 mm) of water. el niño-southern oscillation affects precipitation distribution, altering rainfall patterns across west, midwest, southeast, , throughout tropics.


during summer, southwest monsoon combined gulf of california , gulf of mexico moisture moving around subtropical ridge in atlantic ocean bring promise of afternoon , evening thunderstorms southern tier of country great plains. equatorward of subtropical ridge, tropical cyclones enhance precipitation (mostly august october) across southern , eastern sections of country, puerto rico, united states virgin islands, northern mariana islands, guam, , american samoa. on top of ridge, jet stream brings summer precipitation maximum great lakes. large thunderstorm areas known mesoscale convective complexes move through plains, midwest, , great lakes during warm season, contributing 10% of annual precipitation region.








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