AMERICAN FALLS 1 SW, IDAHO

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 32.9 39.2 49.7 60.1 68.7 78.2 86.3 85.8 75.4 61.8 44.1 33.8 59.7
Highest Mean Max. Temperature (F) 42.1 49.2 59.8 70.2 79.3 86.0 91.1 92.7 82.7 71.8 54.9 39.6 92.7
Year Highest Occurred 1994 1992 1992 1987 1992 1988 1994 1994 1990 1988 1999 1980 1994
Lowest Mean Max. Temperature (F) 21.8 28.5 38.1 50.1 61.8 69.6 78.9 82.1 66.0 53.5 35.4 21.1 21.1
Year Lowest Occurred 1979 1985 1985 1975 1977 1998 1993 1976 1986 1984 1985 1985 1985
Mean Temperature (F) 25.2 30.5 39.2 47.5 55.4 63.6 70.4 69.7 60.4 49.1 35.7 26.3 47.8
Highest Mean Temperature (F) 33.8 39.0 46.6 54.4 63.7 70.6 75.0 74.2 67.8 57.7 42.7 32.5 75.0
Year Highest Occurred 1994 1992 1986 1992 1992 1988 1988 1994 1990 1988 1999 1980 1988
Lowest Mean Temperature (F) 13.6 19.0 26.3 40.2 50.5 57.6 63.9 65.4 55.5 43.8 27.3 13.4 13.4
Year Lowest Occurred 1985 1985 1985 1975 1975 1998 1993 1976 1972 1984 2000 1985 1985
Mean Min. Temperature (F) 17.5 21.8 28.6 34.9 42.0 48.9 54.5 53.6 45.3 36.4 27.3 18.7 35.8
Highest Mean Min. Temperature (F) 26.2 29.9 35.2 40.5 48.0 55.1 59.6 58.9 52.9 43.6 31.8 26.7 59.6
Year Highest Occurred 1998 1986 1986 1990 1992 1988 1985 1991 1990 1988 1983 1977 1985
Lowest Mean Min. Temperature (F) 4.8 9.4 14.5 29.6 37.6 44.5 48.5 48.5 39.1 30.0 18.9 5.6 4.8
Year Lowest Occurred 1985 1985 1985 1997 1975 1995 1997 1974 1974 1976 2000 1985 1985
Mean Precipitation (in.) 1.10 0.97 1.35 1.20 1.60 0.95 0.61 0.60 0.84 0.95 1.20 1.06 12.43
Highest Precipitation (in.) 3.54 3.58 3.35 3.13 4.17 3.49 3.33 1.71 3.22 2.53 3.29 4.60 4.60
Year Highest Occurred 1980 1986 1989 1971 1980 1995 1984 1982 1982 1974 1983 1983 1983
Lowest Precipitation (in.) 0.19 0.00 0.15 0.13 0.13 0.08 0.00 0.00 0.00 0.00 0.00 0.11 0.00
Year Lowest Occurred 1992 1997 1992 1998 1992 1974 1999 1998 1987 1988 1976 1989 1997
Heating Degree Days (F) 1235. 967. 800. 526. 312. 124. 24. 25. 185. 495. 879. 1201. 6773.
Cooling Degree Days (F) 0. 0. 0. 0. 12. 80. 191. 171. 45. 2. 0. 0. 501.

Western Regional Climate Center, wrcc@dri.edu