TRACY PUMPING PLANT, CALIFORNIA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 53.7 61.2 65.5 71.3 79.0 86.1 92.1 91.1 86.4 77.8 63.7 53.8 73.5
Highest Mean Max. Temperature (F) 59.0 67.4 73.2 80.0 85.0 93.5 97.1 97.0 91.9 83.7 69.8 58.4 76.2
Year Highest Occurred 1976 1988 1972 1987 1987 1981 1988 1967 1984 1990 1986 1976 1990
Lowest Mean Max. Temperature (F) 48.5 55.0 61.0 58.6 70.8 78.7 86.9 84.6 80.3 72.7 57.2 45.4 71.2
Year Lowest Occurred 1985 1969 1973 1967 1961 1982 1987 1976 1985 1972 1982 1963 1963
Mean Temperature (F) 45.2 51.0 54.8 59.2 65.7 71.6 76.2 75.7 72.1 64.8 53.6 45.5 61.3
Highest Mean Temperature (F) 50.5 57.1 60.8 64.8 70.3 78.0 80.6 80.1 77.3 68.4 56.7 50.8 63.0
Year Highest Occurred 1986 1963 1972 1990 1984 1981 1988 1967 1984 1987 1967 1983 1981
Lowest Mean Temperature (F) 41.1 47.0 51.5 49.9 59.7 66.3 71.5 71.6 66.9 61.4 49.4 40.4 59.8
Year Lowest Occurred 1972 1962 1985 1967 1961 1965 1987 1968 1965 1971 1982 1963 1963
Mean Min. Temperature (F) 36.7 40.7 44.0 47.0 52.4 57.0 60.2 60.2 57.6 51.8 43.4 37.2 49.0
Highest Mean Min. Temperature (F) 43.1 48.0 49.5 51.7 56.6 62.5 64.5 63.2 62.6 56.3 47.9 44.3 51.2
Year Highest Occurred 1986 1963 1978 1990 1984 1981 1985 1983 1984 1979 1981 1983 1981
Lowest Mean Min. Temperature (F) 29.9 36.7 40.7 41.1 48.5 53.6 56.1 57.1 49.9 46.7 39.1 29.8 47.6
Year Lowest Occurred 1962 1989 1985 1967 1961 1965 1987 1987 1968 1971 1961 1990 1962
Mean Precipitation (in.) 2.38 1.92 1.71 0.80 0.22 0.14 0.05 0.10 0.26 0.67 1.88 1.72 11.85
Highest Precipitation (in.) 5.61 5.93 5.89 2.91 2.00 1.80 0.62 0.73 2.20 2.87 4.93 3.74 27.48
Year Highest Occurred 1978 1962 1983 1983 1990 1964 1980 1976 1982 1962 1983 1964 1983
Lowest Precipitation (in.) 0.25 0.01 0.05 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 5.44
Year Lowest Occurred 1976 1964 1972 1962 1987 1990 1990 1990 1988 1986 1986 1989 1976
Heating Degree Days (F) 614. 392. 316. 209. 81. 15. 0. 0. 12. 73. 342. 605. 2659.
Cooling Degree Days (F) 0. 0. 0. 35. 103. 213. 347. 332. 225. 66. 0. 0. 1321.

Western Regional Climate Center, wrcc@dri.edu