CHINOOK, MONTANA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 25.9 33.4 45.1 58.9 69.1 77.8 84.0 83.7 72.1 59.2 40.3 29.7 56.6
Highest Mean Max. Temperature (F) 44.7 47.4 57.4 67.8 76.5 91.4 89.7 90.5 81.9 64.9 52.2 46.3 91.4
Year Highest Occurred 1992 1991 1992 1980 1988 1988 1985 1983 1998 1974 1999 1999 1988
Lowest Mean Max. Temperature (F) 7.4 17.1 34.3 43.9 61.4 72.2 73.4 76.6 59.9 51.3 17.8 4.0 4.0
Year Lowest Occurred 1982 1979 1996 1975 1974 1998 1993 1974 1985 1984 1985 1983 1983
Mean Temperature (F) 12.7 19.8 30.9 44.4 55.0 63.9 68.6 67.6 55.4 43.2 26.9 16.7 42.1
Highest Mean Temperature (F) 29.1 32.8 40.3 51.4 60.6 73.7 72.2 72.8 63.1 45.8 37.9 31.6 73.7
Year Highest Occurred 1992 1991 1986 1980 1988 1988 1989 1971 1998 1979 1999 1999 1988
Lowest Mean Temperature (F) -5.2 3.7 22.0 33.4 49.4 59.4 61.7 62.0 49.0 38.2 6.6 -7.1 -7.1
Year Lowest Occurred 1982 1979 1996 1975 1974 1981 1993 1980 1985 1972 1985 1983 1983
Mean Min. Temperature (F) -0.5 6.2 16.7 29.9 40.8 49.9 53.1 51.4 38.6 27.2 13.4 3.7 27.5
Highest Mean Min. Temperature (F) 16.6 19.6 27.5 34.9 44.6 55.9 57.2 56.3 44.2 29.9 23.6 16.9 57.2
Year Highest Occurred 1986 1999 1986 1980 1988 1988 1989 1971 1998 1999 1999 1999 1989
Lowest Mean Min. Temperature (F) -17.8 -9.6 9.6 23.0 37.5 45.5 47.7 47.2 33.7 20.7 -4.7 -18.2 -18.2
Year Lowest Occurred 1982 1979 1975 1975 1974 1981 1972 1988 1974 1972 1985 1983 1983
Mean Precipitation (in.) 0.54 0.32 0.56 0.99 2.29 2.29 1.66 1.34 1.43 0.66 0.47 0.51 13.06
Highest Precipitation (in.) 1.99 1.22 1.34 2.56 6.14 5.19 5.20 5.49 8.83 2.05 1.20 2.11 8.83
Year Highest Occurred 1971 1994 1998 1973 1974 1995 1992 1974 1986 1995 1998 1977 1986
Lowest Precipitation (in.) 0.00 0.00 0.00 0.03 0.39 0.01 0.00 0.02 0.12 0.00 0.01 0.00 0.00
Year Lowest Occurred 1985 1981 1973 1972 1976 1985 1994 1988 1974 1978 1982 1999 1985
Heating Degree Days (F) 1624. 1265. 1058. 618. 318. 108. 38. 69. 314. 675. 1145. 1497. 8729.
Cooling Degree Days (F) 0. 0. 0. 0. 7. 74. 147. 148. 25. 0. 0. 0. 401.
Western Regional Climate Center, wrcc@dri.edu