RIO PIEDRAS EXP STN, PUERTO RICO

NCDC 1961-1990 Monthly Normals

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Mean Max. Temperature (F) 83.3 83.8 84.7 86.0 87.2 88.6 88.5 88.7 88.8 88.6 86.3 84.1 86.6
Highest Mean Max. Temperature (F) 85.5 85.9 87.9 89.5 90.4 91.5 90.9 90.9 91.2 90.5 89.0 86.8 88.1
Year Highest Occurred 1973 1983 1983 1984 1973 1983 1974 1987 1987 1972 1972 1989 1987
Lowest Mean Max. Temperature (F) 80.0 81.5 81.7 82.6 84.1 86.0 86.4 86.8 87.7 86.4 84.0 81.1 85.1
Year Lowest Occurred 1965 1962 1968 1968 1965 1989 1970 1965 1977 1975 1984 1964 1965
Mean Temperature (F) 74.6 74.8 75.7 77.1 78.9 80.3 80.6 80.6 80.6 80.1 78.1 75.7 78.1
Highest Mean Temperature (F) 76.9 76.1 78.4 80.2 81.3 82.5 81.9 82.9 82.7 81.9 80.5 77.6 79.7
Year Highest Occurred 1973 1973 1983 1987 1980 1988 1988 1987 1987 1987 1990 1987 1987
Lowest Mean Temperature (F) 71.9 72.8 73.6 74.6 77.2 78.7 79.3 79.3 79.2 78.1 76.3 73.5 76.8
Year Lowest Occurred 1965 1976 1967 1968 1963 1965 1976 1974 1974 1975 1961 1964 1975
Mean Min. Temperature (F) 65.8 65.8 66.6 68.1 70.5 71.9 72.6 72.5 72.2 71.5 69.8 67.3 69.6
Highest Mean Min. Temperature (F) 68.2 67.4 69.1 71.7 73.1 74.3 74.5 75.0 74.3 74.0 72.1 69.3 71.2
Year Highest Occurred 1973 1973 1969 1987 1969 1988 1983 1990 1990 1990 1990 1981 1987
Lowest Mean Min. Temperature (F) 62.5 60.7 63.8 65.5 68.0 69.3 70.5 70.0 70.3 69.6 67.1 65.5 67.5
Year Lowest Occurred 1985 1976 1976 1985 1975 1975 1976 1974 1974 1974 1975 1985 1976
Mean Precipitation (in.) 5.03 3.52 3.94 6.39 8.43 6.71 7.00 9.11 8.35 8.93 8.88 7.34 83.63
Highest Precipitation (in.) 13.65 9.53 11.21 19.44 22.91 22.68 25.64 24.77 27.63 18.76 36.91 28.18 181.95
Year Highest Occurred 1962 1979 1963 1964 1962 1964 1964 1961 1963 1961 1961 1961 1961
Lowest Precipitation (in.) 1.57 0.79 0.60 1.04 1.72 0.72 2.59 3.08 2.64 2.51 2.53 1.01 42.82
Year Lowest Occurred 1983 1986 1970 1968 1973 1977 1987 1967 1967 1981 1980 1963 1967
Heating Degree Days (F) 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
Cooling Degree Days (F) 298. 274. 332. 363. 431. 459. 484. 484. 468. 468. 393. 332. 4786.

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