SISTERS, OREGON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 39.1 43.2 49.8 56.7 64.6 74.0 83.4 83.6 74.8 62.8 45.8 39.2 59.8
Highest Mean Max. Temperature (F) 45.6 51.2 56.0 68.7 72.4 81.6 90.5 90.5 81.6 70.2 53.0 45.6 90.5
Year Highest Occurred 1994 1991 1992 1987 1992 1986 1985 1977 1998 1988 1999 1980 1985
Lowest Mean Max. Temperature (F) 28.3 33.5 44.1 48.3 57.9 68.0 73.4 75.3 66.6 56.5 37.8 31.8 28.3
Year Lowest Occurred 1979 1993 1975 1978 1977 1980 1993 1976 1985 1984 1985 1985 1979
Mean Temperature (F) 29.6 33.0 38.0 42.6 49.0 56.2 62.6 62.4 54.8 45.9 35.6 29.6 44.9
Highest Mean Temperature (F) 35.0 38.6 42.0 49.0 54.2 60.9 68.9 66.9 60.4 51.9 42.0 35.3 68.9
Year Highest Occurred 1999 1991 1986 1987 1992 1974 1998 1977 1998 1988 1999 1973 1998
Lowest Mean Temperature (F) 17.5 21.6 33.4 37.5 44.9 52.4 55.9 57.8 49.0 43.0 25.5 19.3 17.5
Year Lowest Occurred 1979 1989 1975 1975 1977 1980 1993 1975 1985 1984 1985 1985 1979
Mean Min. Temperature (F) 20.0 22.8 26.1 28.5 33.4 38.3 41.7 41.1 34.7 28.9 25.3 20.0 30.1
Highest Mean Min. Temperature (F) 26.4 30.1 31.7 33.4 38.9 41.5 48.5 46.7 40.6 34.1 30.9 28.0 48.5
Year Highest Occurred 1990 1983 1983 1992 1993 1977 1998 1999 1997 1979 1999 1973 1998
Lowest Mean Min. Temperature (F) 6.8 9.7 22.1 22.7 28.1 34.0 36.9 35.8 31.2 25.0 12.0 6.8 6.8
Year Lowest Occurred 1979 1989 1971 1982 1975 1976 1981 1980 1984 1974 1978 1985 1979
Mean Precipitation (in.) 2.32 1.72 1.17 0.89 0.79 0.60 0.45 0.50 0.48 0.98 2.14 2.15 14.19
Highest Precipitation (in.) 4.53 5.26 3.09 2.29 3.95 2.36 2.45 2.33 2.06 4.75 6.20 8.83 8.83
Year Highest Occurred 1971 1986 1983 1992 1998 1982 1987 1999 1982 1984 1984 1981 1981
Lowest Precipitation (in.) 0.11 0.21 0.21 0.00 0.06 0.00 0.00 0.00 0.00 0.00 0.37 0.15 0.00
Year Lowest Occurred 1985 1991 1973 1977 1976 1987 1999 2000 1999 1988 1979 1976 1977
Heating Degree Days (F) 1099. 896. 838. 672. 497. 274. 133. 137. 315. 594. 884. 1099. 7438.
Cooling Degree Days (F) 0. 0. 0. 0. 0. 8. 56. 54. 7. 0. 0. 0. 125.

Western Regional Climate Center, wrcc@dri.edu