JOHN MARTIN DAM, COLORADO

NCDC 1971-2000 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Monthly
Mean Max. Temperature (F) 42.6 50.3 58.8 67.9 76.4 88.1 93.6 91.4 82.7 71.7 55.3 44.9 68.6
Highest Mean Max. Temperature (F) 57.5 59.8 66.5 78.1 84.9 94.5 99.0 98.1 88.5 78.5 65.6 53.4 99.0
Year Highest Occurred 1986 1999 1986 1981 1974 1994 1980 2000 1998 1979 1999 1980 1980
Lowest Mean Max. Temperature (F) 32.3 36.4 51.3 56.7 69.1 78.6 89.3 83.5 77.4 62.4 43.0 30.7 30.7
Year Lowest Occurred 1979 1982 1984 1984 1995 1983 1990 1992 1993 1984 1972 1983 1983
Mean Temperature (F) 27.8 34.4 42.5 51.8 61.3 72.2 77.4 75.4 66.0 53.9 39.3 29.9 52.7
Highest Mean Temperature (F) 38.2 42.1 48.2 59.0 66.2 76.7 81.6 80.6 72.1 57.8 46.6 36.4 81.6
Year Highest Occurred 1986 1999 1986 1981 1998 1981 1980 2000 1998 1979 1999 1980 1980
Lowest Mean Temperature (F) 17.4 23.9 36.4 44.5 56.5 65.8 74.1 70.1 60.6 48.0 30.3 17.4 17.4
Year Lowest Occurred 1979 1978 1984 1984 1995 1983 1996 1992 1993 1984 1972 1983 1979
Mean Min. Temperature (F) 13.0 18.4 26.2 35.6 46.1 56.2 61.1 59.3 49.2 36.0 23.2 14.8 36.6
Highest Mean Min. Temperature (F) 21.5 27.4 30.7 39.9 49.4 60.0 64.2 63.0 55.7 42.3 28.9 20.9 64.2
Year Highest Occurred 1998 1987 1992 1981 1998 1981 1980 2000 1998 2000 1998 1997 1980
Lowest Mean Min. Temperature (F) 2.5 9.7 21.3 29.8 42.7 52.5 57.1 56.0 43.7 31.0 15.3 4.1 2.5
Year Lowest Occurred 1979 1989 1996 1983 1990 1982 1996 1974 1993 1976 1993 1983 1979
Mean Precipitation (in.) 0.19 0.33 0.76 1.08 2.16 1.85 2.40 2.02 1.12 0.80 0.46 0.30 13.47
Highest Precipitation (in.) 0.76 1.64 2.66 3.76 5.78 6.65 7.44 5.68 4.80 2.81 1.79 2.64 7.44
Year Highest Occurred 1990 1987 1973 1980 1977 1995 1990 1997 1988 1997 1998 1982 1990
Lowest Precipitation (in.) 0.00 0.00 0.00 0.00 0.55 0.21 0.52 0.05 0.00 0.00 0.00 0.00 0.00
Year Lowest Occurred 1998 1999 1986 1974 1991 1976 1987 1974 1974 1980 1995 1999 1998
Heating Degree Days (F) 1154. 859. 698. 406. 157. 17. 0. 3. 72. 349. 773. 1090. 5578.
Cooling Degree Days (F) 0. 0. 0. 8. 41. 230. 384. 324. 101. 2. 0. 0. 1090.

Western Regional Climate Center, wrcc@dri.edu