PORTLAND WB CITY, OREGON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 45.5 50.1 55.5 60.8 67.0 72.6 78.9 79.1 74.2 63.0 51.4 45.5 62.0
Highest Mean Max. Temperature (F) 50.4 57.4 63.6 66.3 75.8 77.7 85.4 84.3 81.0 70.1 56.7 55.1 85.4
Year Highest Occurred 1986 1991 1992 1989 1992 1992 1985 1986 1974 1987 1995 1999 1985
Lowest Mean Max. Temperature (F) 34.9 42.4 49.9 55.2 61.1 67.2 71.2 73.0 68.5 58.3 42.5 39.5 34.9
Year Lowest Occurred 1979 1989 1971 1975 1977 1980 1993 1975 1978 1984 1985 1983 1979
Mean Temperature (F) 41.1 44.3 48.1 52.2 57.8 62.9 68.1 68.5 64.4 55.6 46.6 41.4 54.3
Highest Mean Temperature (F) 45.3 50.5 53.8 56.7 64.0 67.0 72.0 72.0 69.1 59.8 52.3 50.0 72.0
Year Highest Occurred 1981 1991 1992 1989 1992 1992 1985 1981 1974 1987 1995 1999 1981
Lowest Mean Temperature (F) 31.3 36.3 43.5 46.9 53.4 59.5 63.2 64.1 60.1 52.1 37.3 34.9 31.3
Year Lowest Occurred 1979 1989 1971 1975 1977 1991 1993 1975 1985 1984 1985 1990 1979
Mean Min. Temperature (F) 36.7 38.5 40.7 43.5 48.5 53.2 57.3 57.9 54.6 48.1 41.8 37.3 46.5
Highest Mean Min. Temperature (F) 41.5 43.5 44.4 47.9 52.6 56.3 60.4 60.6 58.2 52.9 47.8 44.9 60.6
Year Highest Occurred 1981 1992 1986 1992 1997 1978 1998 1977 1979 1979 1995 1999 1977
Lowest Mean Min. Temperature (F) 27.7 30.2 37.0 38.7 45.6 50.8 55.0 54.4 51.3 45.4 32.0 29.8 27.7
Year Lowest Occurred 1979 1989 1971 1975 1999 1984 1986 1973 1985 1972 1985 1985 1979
Mean Precipitation (in.) 6.24 5.07 4.51 3.10 2.49 1.60 0.76 0.99 1.87 3.39 6.39 6.75 43.16
Highest Precipitation (in.) 9.89 12.43 8.74 6.31 5.18 4.48 2.94 3.57 4.69 9.02 13.46 16.28 16.28
Year Highest Occurred 1971 1996 1989 1993 1998 1984 1983 1977 1977 1994 1973 1996 1996
Lowest Precipitation (in.) 0.27 0.96 1.73 0.63 0.13 0.09 0.00 0.00 0.00 0.28 1.13 1.36 0.00
Year Lowest Occurred 1985 1993 1978 1977 1992 1996 1984 1998 1993 1987 1976 1976 1984
Heating Degree Days (F) 741. 580. 525. 385. 238. 104. 32. 27. 89. 296. 552. 731. 4300.
Cooling Degree Days (F) 0. 0. 0. 0. 14. 41. 128. 136. 71. 3. 0. 0. 393.

Western Regional Climate Center, wrcc@dri.edu