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Historical monthly precipitation and water use
Average water use (the blue line) is based on Seattle retail and wholesale consumption in the water years 1990 to 1998, except the drought year of 1992.
Monthly precipitation is based on National Weather Service gage records from SeaTac airport between 1948 and 1994. The graph shows monthly averages (black square) plus or minus 1 standard deviation (blue circles), and maxima and minima.
Average water use (the blue line) is based on Seattle retail and wholesale consumption in the water years 1990 to 1998, except the drought year of 1992.