NINETY NINE ISLANDS, SOUTH CAROLINA

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 51.4 55.5 64.3 73.0 80.0 86.3 89.5 88.4 82.7 73.6 64.3 54.6 72.0
Highest Mean Max. Temperature (F) 61.2 66.2 69.8 78.0 88.6 90.5 94.5 94.5 87.5 80.2 69.8 64.0 73.2
Year Highest Occurred 1974 1976 1974 1981 1962 1981 1983 1980 1970 1984 1964 1984 1970
Lowest Mean Max. Temperature (F) 41.6 48.0 58.3 67.2 75.5 82.5 86.2 83.8 77.9 66.5 57.7 45.8 69.7
Year Lowest Occurred 1977 1978 1965 1961 1989 1979 1989 1986 1967 1988 1976 1989 1989
Mean Temperature (F) 38.7 41.9 49.8 57.9 66.1 73.5 77.4 76.6 70.4 59.1 49.9 41.7 58.6
Highest Mean Temperature (F) 51.0 49.0 54.7 61.5 72.5 77.8 80.7 79.6 74.5 67.0 58.0 50.6 60.6
Year Highest Occurred 1974 1976 1973 1977 1962 1981 1986 1980 1973 1984 1985 1971 1990
Lowest Mean Temperature (F) 29.4 35.0 43.9 52.6 62.4 69.8 75.4 74.3 64.0 52.2 43.1 34.8 56.8
Year Lowest Occurred 1977 1978 1969 1961 1989 1972 1979 1967 1967 1987 1976 1963 1988
Mean Min. Temperature (F) 25.9 28.2 35.3 42.7 52.2 60.7 65.4 64.8 58.0 44.6 35.5 28.7 45.2
Highest Mean Min. Temperature (F) 40.7 35.5 42.7 46.6 57.7 65.1 67.2 67.3 62.2 53.9 48.0 38.8 47.9
Year Highest Occurred 1974 1990 1973 1965 1975 1981 1986 1987 1980 1971 1985 1971 1990
Lowest Mean Min. Temperature (F) 17.2 19.3 27.7 37.7 47.9 55.5 62.9 61.6 50.1 35.7 28.4 21.8 43.2
Year Lowest Occurred 1977 1968 1969 1971 1981 1972 1976 1976 1967 1987 1976 1963 1981
Mean Precipitation (in.) 4.21 4.15 4.96 3.16 4.10 4.08 4.53 4.60 3.84 3.69 3.41 4.06 48.79
Highest Precipitation (in.) 8.25 6.43 9.54 7.95 10.52 7.91 10.91 11.04 9.73 14.93 8.83 8.75 62.79
Year Highest Occurred 1978 1961 1980 1964 1975 1962 1971 1985 1987 1990 1985 1983 1975
Lowest Precipitation (in.) 0.30 0.64 1.15 0.39 0.59 0.17 0.85 0.99 0.29 0.02 0.88 0.39 34.25
Year Lowest Occurred 1981 1978 1985 1976 1965 1986 1977 1962 1961 1963 1973 1965 1988
Heating Degree Days (F) 815. 647. 471. 220. 67. 0. 0. 0. 14. 220. 453. 722. 3629.
Cooling Degree Days (F) 0. 0. 0. 7. 101. 255. 384. 360. 176. 37. 0. 0. 1320.

Southeast Regional Climate Center, sercc@climate.ncsu.edu