SILVERTON, OREGON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 46.1 50.4 55.2 59.6 66.0 71.6 78.6 79.2 74.3 63.4 51.9 45.5 61.8
Highest Mean Max. Temperature (F) 50.9 56.3 61.2 64.8 75.5 78.5 84.5 84.3 82.9 70.8 56.8 51.0 84.5
Year Highest Occurred 1986 1991 1992 1989 1992 1992 1985 1977 1974 1987 1995 1979 1985
Lowest Mean Max. Temperature (F) 37.7 43.1 50.6 54.6 61.3 66.5 71.5 73.8 68.6 57.2 43.7 39.8 37.7
Year Lowest Occurred 1979 1989 1971 1975 1977 1991 1993 1975 1986 1984 1985 1990 1979
Mean Temperature (F) 39.8 43.0 46.8 50.3 56.0 61.1 66.4 66.8 62.5 53.7 45.2 39.6 52.6
Highest Mean Temperature (F) 43.8 48.6 51.5 55.0 62.5 66.3 70.2 70.9 67.2 57.9 50.8 44.0 70.9
Year Highest Occurred 1986 1991 1986 1989 1992 1992 1985 1977 1974 1987 1995 1979 1977
Lowest Mean Temperature (F) 30.5 36.0 42.4 45.9 51.8 57.0 62.5 63.0 58.6 49.9 37.6 33.4 30.5
Year Lowest Occurred 1979 1989 1971 1975 1977 1971 1993 1975 1971 1971 1985 1985 1979
Mean Min. Temperature (F) 33.5 35.5 38.4 41.0 45.9 50.5 54.2 54.4 50.6 43.9 38.5 33.7 43.3
Highest Mean Min. Temperature (F) 38.3 40.9 42.8 45.1 50.2 54.3 56.9 57.5 54.8 48.7 44.8 37.2 57.5
Year Highest Occurred 1998 1991 1986 1989 1997 1986 1998 1977 1990 1988 1995 1973 1977
Lowest Mean Min. Temperature (F) 23.2 28.8 34.1 36.0 42.3 47.4 52.2 49.4 47.0 39.9 31.0 26.6 23.2
Year Lowest Occurred 1979 1989 1976 1982 1977 1971 1984 1973 1971 1971 1993 1985 1979
Mean Precipitation (in.) 6.49 5.57 5.03 3.79 2.98 2.08 0.86 0.99 1.88 3.60 7.16 7.07 47.50
Highest Precipitation (in.) 11.74 13.52 9.29 7.77 6.07 5.75 4.03 3.87 4.53 7.88 15.93 16.33 16.33
Year Highest Occurred 1997 1996 1997 1993 1991 1984 1983 1978 1971 1990 1973 1996 1996
Lowest Precipitation (in.) 0.66 1.51 1.69 1.16 0.17 0.32 0.03 0.00 0.00 0.20 1.68 1.74 0.00
Year Lowest Occurred 1985 1988 1992 1977 1992 1986 1994 1998 1975 1987 1993 1976 1998
Heating Degree Days (F) 780. 618. 565. 440. 286. 144. 46. 43. 119. 354. 595. 787. 4777.
Cooling Degree Days (F) 0. 0. 0. 0. 6. 25. 89. 98. 43. 1. 0. 0. 262.

Western Regional Climate Center, wrcc@dri.edu