Seattle, Washington, Average Temperature, July-April Degrees Fahrenheit 1949-1983 -99 194904 49.0 -2.3 195004 49.6 -1.7 195104 51.2 -0.1 195204 50.7 -0.6 195304 51.9 0.6 195404 50.9 -0.4 195504 49.7 -1.6 195604 48.7 -2.6 195704 50.1 -1.2 195804 52.5 1.2 195904 53.0 1.7 196004 51.2 -0.1 196104 52.1 0.8 196204 51.8 0.5 196304 51.7 0.4 196404 51.6 0.3 196504 51.0 -0.3 196604 52.4 1.1 196704 51.8 0.5 196804 54.0 2.7 196904 50.2 -1.1 197004 52.1 0.8 197104 50.3 -1.0 197204 50.4 -0.9 197304 50.5 -0.8 197404 51.3 0.0 197504 50.8 -0.5 197604 51.0 -0.3 197704 52.4 1.1 197804 51.7 0.4 197904 50.0 -1.3 198004 52.2 0.9 198104 53.0 1.7 198204 51.6 0.3 198304 52.7 1.4