CIRCLE, MONTANA

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 27.0 34.2 44.7 58.3 69.6 79.4 86.4 86.2 73.8 60.0 41.5 30.6 57.6
Highest Mean Max. Temperature (F) 43.5 48.3 54.6 67.6 78.9 94.6 92.3 96.5 83.5 65.6 56.4 44.8 96.5
Year Highest Occurred 1981 1984 1981 1980 1980 1988 1984 1983 1998 1979 1999 1979 1983
Lowest Mean Max. Temperature (F) 12.0 14.3 30.7 46.9 59.4 70.6 71.9 77.3 63.0 56.1 26.0 12.9 12.0
Year Lowest Occurred 1979 1989 1996 1975 1996 1998 1993 1993 1986 1971 1985 1983 1979
Mean Temperature (F) 16.4 23.4 33.0 44.9 55.8 65.1 70.8 70.2 58.4 46.2 30.6 19.9 44.6
Highest Mean Temperature (F) 30.7 36.5 42.7 51.6 62.5 77.9 75.4 77.9 67.0 49.8 42.0 30.3 77.9
Year Highest Occurred 1981 1984 1986 1987 1988 1988 1989 1983 1998 1979 1999 1979 1988
Lowest Mean Temperature (F) 1.4 4.7 20.8 37.5 49.9 59.1 61.9 62.6 53.1 42.1 16.7 2.9 1.4
Year Lowest Occurred 1979 1989 1996 1979 1996 1998 1993 1977 1986 1976 1985 1983 1979
Mean Min. Temperature (F) 5.7 12.5 21.2 31.5 42.0 50.7 55.2 54.2 42.9 32.3 19.7 9.1 31.4
Highest Mean Min. Temperature (F) 20.5 24.7 31.0 36.4 46.5 61.2 60.5 59.7 50.4 36.4 28.3 17.6 61.2
Year Highest Occurred 1986 1984 1986 1987 1988 1988 1989 1998 1998 1998 1981 1993 1988
Lowest Mean Min. Temperature (F) -12.2 -5.0 10.8 25.9 37.8 45.9 48.7 47.4 38.0 27.8 7.3 -7.2 -12.2
Year Lowest Occurred 1982 1989 1996 1979 1983 1985 1972 1977 1975 1976 1985 1983 1982
Mean Precipitation (in.) 0.42 0.36 0.64 1.15 1.94 2.39 1.94 1.29 1.35 0.93 0.44 0.43 13.28
Highest Precipitation (in.) 1.67 1.61 1.30 3.98 6.61 7.38 9.33 2.95 5.16 3.78 1.16 1.54 9.33
Year Highest Occurred 1971 1979 1987 1992 1978 1991 1993 1989 1986 1998 1978 1982 1993
Lowest Precipitation (in.) 0.00 0.00 0.00 0.15 0.15 0.50 0.04 0.00 0.08 0.00 0.00 0.00 0.00
Year Lowest Occurred 1995 1990 1999 1988 1980 1985 1984 1996 1993 1988 1987 1997 1995
Heating Degree Days (F) 1510. 1166. 994. 603. 305. 110. 39. 65. 245. 585. 1033. 1399. 8054.
Cooling Degree Days (F) 0. 0. 0. 0. 20. 112. 219. 225. 45. 0. 0. 0. 621.

Western Regional Climate Center, wrcc@dri.edu