Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1952 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 2.77 0.63 4.70 -99.99 1953 5.12 2.37 4.82 3.76 5.87 2.40 3.53 -99.99 -99.99 -99.99 -99.99 2.34 1954 1.51 1.18 4.08 2.66 4.30 0.47 1.83 3.44 2.34 2.91 4.31 2.89 1955 0.93 2.39 4.66 2.26 1.20 6.43 0.68 11.56 -99.99 2.46 1.13 0.23 1956 -99.99 3.24 4.25 2.74 2.09 3.11 3.84 4.15 -99.99 -99.99 5.51 -99.99 1957 1.61 3.85 2.91 3.47 1.00 3.63 2.23 5.17 3.76 3.75 2.56 5.26 1958 4.15 4.71 5.02 3.98 3.71 3.82 8.16 6.84 1.79 5.14 3.30 0.91 1959 2.07 2.74 3.16 3.60 1.39 3.55 3.63 3.50 3.19 4.77 3.39 2.90 1960 2.24 4.26 1.56 2.92 4.35 1.02 6.37 4.77 8.96 2.37 1.90 1.29 1961 3.10 -99.99 4.75 5.39 1.75 5.24 2.34 2.14 1.57 -99.99 2.14 2.80 1962 3.06 3.98 3.55 4.30 1.45 -99.99 -99.99 1.50 0.84 -99.99 5.38 -99.99 1963 1.43 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 1964 -99.99 -99.99 -99.99 4.90 0.19 1.56 2.81 1.64 3.36 1.56 1.63 4.74 1965 2.23 1.89 3.47 0.84 2.72 0.76 2.61 3.76 1.24 1.88 0.96 0.87 1966 2.48 3.23 1.26 2.65 2.78 0.29 1.39 1.33 7.07 5.37 1.79 4.23 1967 1.63 1.66 3.88 2.17 3.17 2.81 2.80 6.02 -99.99 2.11 1.77 5.28 1968 2.43 0.95 5.28 1.37 6.05 -99.99 1.51 1.72 1.05 3.25 4.16 2.17 1969 1.50 2.06 1.59 2.32 3.42 2.11 5.55 2.89 4.16 1.37 1.98 6.75 1970 1.68 1.61 3.69 5.68 1.10 5.54 3.11 1.90 1.04 1.69 3.81 3.01 1971 2.41 5.88 2.43 2.30 5.18 1.81 4.04 10.93 5.78 7.60 5.54 1.95 1972 3.08 5.00 2.64 4.89 3.40 10.70 4.50 1.15 1.81 4.92 6.68 5.59 1973 3.47 3.63 3.52 6.47 5.47 4.96 6.14 3.45 4.93 3.21 1.00 5.95 1974 2.78 1.25 4.34 3.18 3.22 4.18 1.95 3.89 7.20 1.55 1.63 4.37 1975 4.25 2.64 5.04 3.25 4.88 4.81 7.51 2.93 7.28 3.82 3.49 1.84 1976 5.63 0.95 0.98 1.74 2.19 0.98 4.52 2.52 2.27 7.35 0.49 2.26 1977 1.92 1.09 3.22 3.39 1.27 7.01 2.81 3.01 1.76 3.75 5.34 6.12 1978 6.07 0.59 4.63 1.58 6.17 1.43 3.97 4.55 0.56 1.12 2.33 5.19 1979 7.61 5.70 2.36 3.64 3.03 4.22 4.89 4.34 7.22 3.43 3.63 1.37 1980 2.22 0.83 4.94 4.68 2.72 5.09 1.41 2.93 2.31 4.66 2.29 0.56 1981 0.56 2.94 1.50 4.19 4.40 3.56 2.37 2.07 4.06 3.75 0.44 3.43 1982 -99.99 1.90 3.03 5.18 4.58 4.06 2.87 1.94 2.67 2.36 3.90 2.12 1983 2.42 3.69 8.04 6.86 7.44 3.49 0.88 2.11 3.19 4.11 5.66 6.74 1984 1.36 4.13 6.52 4.29 7.42 3.32 5.82 1.41 2.79 3.38 1.90 1.55 1985 1.34 2.31 2.10 1.13 4.67 2.74 4.42 -99.99 -99.99 -99.99 -99.99 -99.99 1986 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 4.98 2.65 1.14 4.05 5.72 7.19 1987 -99.99 0.00 1.12 2.71 3.46 2.49 1.55 1.15 4.41 2.33 3.78 2.41 1988 2.45 4.17 2.45 2.96 6.02 1.77 4.88 3.86 0.00 0.00 0.00 0.00