SEATTLE SAND PT WSFO, WASHINGTON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 46.4 49.7 53.6 58.3 64.5 69.4 75.0 75.8 70.5 60.2 51.5 46.0 60.1
Highest Mean Max. Temperature (F) 52.2 54.4 58.1 62.2 70.5 74.1 82.4 80.0 76.6 65.7 56.9 49.7 82.4
Year Highest Occurred 1986 1977 1992 1989 1993 1992 1985 1986 1974 1987 1997 1980 1985
Lowest Mean Max. Temperature (F) 40.7 42.5 48.7 53.8 60.0 64.8 69.9 69.7 65.5 56.6 41.9 40.6 40.6
Year Lowest Occurred 1979 1989 1971 1972 1996 1971 1993 1976 1978 1984 1985 1990 1990
Mean Temperature (F) 40.8 43.0 45.9 50.1 55.9 60.6 65.2 66.2 61.5 53.3 45.9 40.7 52.4
Highest Mean Temperature (F) 45.5 46.5 49.0 52.8 61.7 64.3 69.0 68.8 64.6 56.9 49.7 44.8 69.0
Year Highest Occurred 1986 1991 1992 1989 1993 1992 1985 1986 1994 1993 1997 1980 1985
Lowest Mean Temperature (F) 34.5 35.2 41.4 46.0 52.7 57.0 62.7 62.8 58.0 50.5 36.3 35.2 34.5
Year Lowest Occurred 1979 1989 1971 1972 1999 1971 1986 1995 1972 1984 1985 1983 1979
Mean Min. Temperature (F) 35.2 36.2 38.1 41.8 47.3 51.7 55.4 56.5 52.4 46.3 40.2 35.4 44.7
Highest Mean Min. Temperature (F) 40.4 40.1 41.0 44.6 52.8 54.4 58.1 58.9 54.9 51.1 44.2 39.9 58.9
Year Highest Occurred 1994 1998 1983 1994 1993 1992 1998 1997 1997 1988 1995 1980 1997
Lowest Mean Min. Temperature (F) 28.3 27.9 34.0 37.9 43.9 48.8 53.6 53.5 49.5 43.4 30.6 29.8 27.9
Year Lowest Occurred 1979 1989 1971 1975 1999 1976 1999 1973 1985 1972 1985 1983 1989
Mean Precipitation (in.) 4.49 3.67 3.84 2.84 2.10 1.68 0.97 0.97 1.71 3.32 4.92 5.45 35.96
Highest Precipitation (in.) 8.18 8.06 7.80 6.27 4.49 2.95 2.33 2.79 4.18 8.70 9.74 10.85 10.85
Year Highest Occurred 1998 1999 1997 1993 1984 1983 1983 1975 1978 1975 1999 1996 1996
Lowest Precipitation (in.) 0.46 0.63 1.62 1.20 0.64 0.04 0.09 0.09 0.02 0.28 0.95 1.26 0.02
Year Lowest Occurred 1985 1993 1992 1998 1992 1987 1985 1998 1991 1987 1976 1985 1991
Heating Degree Days (F) 752. 618. 594. 448. 285. 144. 48. 40. 135. 364. 575. 753. 4756.
Cooling Degree Days (F) 0. 0. 0. 0. 4. 10. 56. 77. 27. 0. 0. 0. 174.

Western Regional Climate Center, wrcc@dri.edu