HERMISTON 1 SE, OREGON

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 41.7 48.8 58.7 66.6 74.5 81.5 89.2 88.4 79.5 66.6 51.1 41.8 65.7
Highest Mean Max. Temperature (F) 49.1 56.2 63.1 71.8 80.0 88.8 96.6 94.4 85.6 74.0 57.2 47.6 96.6
Year Highest Occurred 1983 1995 1986 1977 1992 1986 1985 1971 1990 1988 1999 1974 1985
Lowest Mean Max. Temperature (F) 24.8 36.4 51.5 61.7 68.4 76.1 81.2 82.7 73.3 63.2 39.1 28.2 24.8
Year Lowest Occurred 1979 1989 1993 1975 1996 1980 1993 1976 1985 1982 1985 1985 1979
Mean Temperature (F) 33.8 39.0 46.4 53.0 60.4 67.1 73.3 72.5 63.5 52.1 41.8 34.4 53.1
Highest Mean Temperature (F) 41.0 44.7 50.8 57.0 65.3 73.1 78.6 76.7 68.8 58.2 47.4 39.7 78.6
Year Highest Occurred 1990 1991 1986 1994 1993 1992 1998 1971 1998 1988 1999 1973 1998
Lowest Mean Temperature (F) 16.7 26.7 41.9 47.9 55.6 63.1 69.1 68.1 58.3 49.9 30.2 23.0 16.7
Year Lowest Occurred 1979 1989 1971 1975 1977 1971 1993 1980 1971 1971 1985 1985 1979
Mean Min. Temperature (F) 25.9 29.1 34.1 39.3 46.3 52.7 57.4 56.6 47.5 37.5 32.5 26.9 40.5
Highest Mean Min. Temperature (F) 33.4 35.2 38.9 44.2 51.3 58.0 62.7 61.4 52.4 42.4 38.6 33.0 62.7
Year Highest Occurred 1990 1992 1983 1994 1993 1992 1998 1994 1998 1988 1995 1999 1998
Lowest Mean Min. Temperature (F) 8.7 16.9 29.3 33.8 42.6 48.1 54.4 52.4 42.4 33.9 21.3 15.4 8.7
Year Lowest Occurred 1979 1989 1975 1982 1977 1976 1978 1975 1971 1978 1985 1990 1979
Mean Precipitation (in.) 1.51 1.07 0.96 0.87 0.89 0.53 0.23 0.36 0.48 0.69 1.50 1.35 10.44
Highest Precipitation (in.) 9.60 3.70 2.74 2.16 3.27 1.60 0.86 1.83 2.75 1.75 6.89 3.46 9.60
Year Highest Occurred 1998 1998 1998 1988 1998 1994 1973 1979 1998 1982 1998 1973 1998
Lowest Precipitation (in.) 0.25 0.01 0.08 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.09 0.07 0.00
Year Lowest Occurred 1985 1988 1994 1977 1990 1986 1985 2000 1999 1988 1993 1990 1977
Heating Degree Days (F) 967. 729. 577. 363. 170. 52. 8. 12. 118. 401. 697. 951. 5045.
Cooling Degree Days (F) 0. 0. 0. 2. 28. 115. 265. 244. 73. 0. 0. 0. 727.

Western Regional Climate Center, wrcc@dri.edu