IRON MTN, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 64.7 70.5 75.9 83.9 93.0 102.8 108.0 106.0 99.5 88.5 74.5 64.9 86.0
Highest Mean Max. Temperature (F) 71.8 77.0 86.0 93.6 100.0 108.1 110.9 110.8 105.2 96.3 80.2 73.9 88.7
Year Highest Occurred 1986 1963 1972 1989 1984 1981 1988 1969 1979 1988 1962 1980 1981
Lowest Mean Max. Temperature (F) 54.9 64.8 69.5 75.7 84.4 94.9 102.3 101.6 93.7 79.3 68.5 58.6 83.3
Year Lowest Occurred 1979 1966 1973 1967 1977 1965 1982 1983 1985 1972 1972 1978 1982
Mean Temperature (F) 53.8 58.6 63.5 70.9 79.6 89.2 94.8 92.8 86.0 75.0 62.6 54.0 73.4
Highest Mean Temperature (F) 60.1 64.2 71.9 80.0 85.5 94.4 97.2 97.7 89.8 81.9 66.6 60.8 75.7
Year Highest Occurred 1986 1963 1972 1989 1984 1981 1988 1969 1979 1988 1967 1980 1989
Lowest Mean Temperature (F) 46.6 52.9 57.7 62.9 72.6 82.1 91.2 89.2 79.9 68.3 58.2 49.2 71.6
Year Lowest Occurred 1979 1966 1962 1967 1977 1965 1982 1968 1985 1971 1972 1978 1971
Mean Min. Temperature (F) 42.9 46.6 50.9 57.8 66.1 75.4 81.6 79.6 72.5 61.4 50.6 43.1 60.7
Highest Mean Min. Temperature (F) 48.3 52.2 57.7 66.3 71.0 80.6 83.9 84.6 76.3 67.4 54.1 47.7 62.9
Year Highest Occurred 1986 1968 1972 1989 1984 1981 1967 1969 1983 1988 1967 1980 1989
Lowest Mean Min. Temperature (F) 38.3 40.9 44.8 50.1 60.8 69.3 78.1 75.8 66.1 55.9 47.1 37.6 59.3
Year Lowest Occurred 1979 1966 1962 1967 1977 1965 1986 1976 1986 1971 1964 1990 1964
Mean Precipitation (in.) 0.44 0.29 0.31 0.15 0.07 0.05 0.30 0.39 0.28 0.40 0.27 0.43 3.38
Highest Precipitation (in.) 2.46 1.58 2.03 1.66 0.55 1.24 1.75 1.69 2.45 2.08 1.08 2.43 7.05
Year Highest Occurred 1978 1980 1983 1965 1987 1972 1979 1967 1976 1968 1985 1984 1978
Lowest Precipitation (in.) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.59
Year Lowest Occurred 1972 1987 1989 1989 1989 1989 1989 1985 1989 1988 1989 1990 1975
Heating Degree Days (F) 353. 194. 130. 52. 0. 0. 0. 0. 0. 12. 118. 350. 1209.
Cooling Degree Days (F) 6. 14. 84. 229. 453. 726. 924. 862. 630. 322. 46. 9. 4305.

Western Regional Climate Center, wrcc@dri.edu