YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.17 | a | 50.52 | b | 40.39 | b | 37.55 | 46.66 | h | |
1932 | 37.34 | 39.10 | 45.71 | 49.95 | 54.73 | a | 61.40 | d | 59.67 | b | 63.67 | a | 60.50 | 53.37 | 46.59 | b | 36.60 | a | 50.72 | |||||||
1933 | 37.10 | 35.61 | 42.70 | a | 48.27 | b | 51.90 | 58.57 | a | 63.79 | c | 63.17 | y | 60.32 | 53.05 | b | 45.94 | e | ----- | z | 49.72 | b | ||||
1934 | 46.34 | 44.89 | a | 49.79 | 54.55 | b | 60.32 | 60.29 | f | 62.48 | d | 64.88 | b | 58.48 | a | 53.00 | c | 46.21 | b | 40.63 | a | 52.87 | a | |||
1935 | 38.18 | a | 41.66 | c | 40.44 | 47.07 | b | 55.07 | a | 60.21 | a | 63.65 | d | 63.97 | 61.26 | a | 49.76 | 40.62 | 40.77 | a | 50.22 | |||||
1936 | 41.31 | 34.24 | 43.29 | c | 55.76 | k | 58.05 | b | 61.76 | c | 63.39 | c | 66.32 | 58.08 | 53.73 | 42.75 | 42.47 | 51.40 | a | |||||||
1937 | 29.71 | 39.12 | 46.69 | 50.79 | a | 54.15 | 62.24 | g | 66.65 | a | 63.32 | c | 60.37 | 54.40 | 46.43 | 42.61 | 50.39 | a | ||||||||
1938 | 41.13 | 41.59 | 43.95 | a | 51.35 | 56.64 | b | 61.41 | b | 66.30 | f | 63.32 | 63.38 | 51.35 | 42.42 | 40.30 | a | 50.62 | a | |||||||
1939 | 42.53 | 39.30 | 44.47 | a | 52.72 | 55.85 | 59.25 | b | 64.31 | 65.02 | 60.30 | 52.23 | 47.14 | a | 44.18 | 52.27 | ||||||||||
1940 | 41.67 | a | 43.98 | 48.06 | 52.45 | 58.81 | 63.38 | 64.10 | 64.78 | a | 62.48 | 54.08 | 41.28 | a | 41.94 | 53.08 | ||||||||||
1941 | 40.90 | a | 43.57 | 49.87 | a | 52.43 | 55.47 | 59.55 | a | 68.05 | 64.03 | 57.45 | 52.47 | 45.85 | 40.00 | b | 52.47 | |||||||||
1942 | 37.40 | 41.41 | 43.98 | 51.02 | 55.02 | 59.38 | 65.53 | a | 66.53 | 60.33 | a | 53.68 | 42.53 | 42.02 | 51.57 | |||||||||||
1943 | 34.03 | 41.41 | 42.55 | 51.05 | 52.92 | 58.38 | ----- | z | 61.71 | ----- | z | 51.02 | b | 44.62 | a | 37.74 | h | 48.63 | c | |||||||
1944 | 40.05 | a | 40.97 | 43.50 | 48.87 | 54.22 | a | 59.19 | a | 63.94 | 63.52 | 61.68 | 54.56 | 44.95 | 36.29 | 50.98 | ||||||||||
1945 | 41.31 | 41.86 | 43.11 | 47.05 | 57.31 | b | 56.90 | 65.16 | 63.79 | 56.83 | 51.65 | 43.91 | a | 39.72 | a | 50.72 | ||||||||||
1946 | 40.95 | b | 42.27 | 44.37 | 48.55 | a | 59.47 | a | 57.70 | 64.19 | 64.27 | 58.33 | 47.48 | 40.07 | c | 41.52 | b | 50.77 | ||||||||
1947 | 35.20 | a | 43.59 | a | 47.26 | 50.76 | a | 58.42 | 59.65 | c | 63.13 | 63.78 | a | 59.07 | 52.26 | 44.37 | 41.80 | a | 51.61 | |||||||
1948 | 40.06 | d | 39.74 | d | ----- | z | ----- | z | ----- | z | 63.86 | a | 63.71 | 62.60 | 58.43 | 50.26 | 42.97 | a | 35.77 | 50.82 | c | |||||
1949 | 29.17 | a | 37.22 | a | 45.45 | 49.90 | a | 57.74 | 58.40 | 62.56 | 62.40 | a | 60.10 | i | 47.66 | c | 48.63 | 39.55 | 48.97 | a | ||||||
1950 | 27.45 | a | 39.84 | 42.58 | 46.32 | 52.11 | 60.23 | 64.24 | 65.44 | 58.67 | 49.94 | 44.08 | 45.44 | 49.69 | ||||||||||||
1951 | 38.39 | 40.91 | 39.71 | 49.95 | 54.60 | 61.60 | 64.76 | 63.92 | 59.40 | 51.16 | 43.47 | a | 37.06 | 50.41 | ||||||||||||
1952 | 36.61 | 40.86 | 42.68 | 49.03 | 54.66 | b | 57.50 | 64.00 | 64.36 | c | 60.48 | 54.69 | 42.07 | 40.80 | a | 50.65 | ||||||||||
1953 | 44.66 | b | 42.07 | 43.66 | 47.73 | 53.18 | a | 57.16 | a | 63.40 | b | 63.68 | a | 60.15 | 53.70 | a | 47.26 | a | 43.03 | 51.64 | ||||||
1954 | 36.73 | a | 42.44 | a | 42.19 | 47.33 | 54.82 | 56.41 | a | 60.35 | a | 61.52 | 59.58 | 50.77 | 48.53 | 40.28 | a | 50.08 | ||||||||
1955 | 39.95 | 39.07 | 40.35 | 44.55 | 51.48 | 59.23 | 61.13 | 62.16 | b | 57.47 | 50.61 | d | 40.00 | a | 38.65 | 48.72 | ||||||||||
1956 | 38.73 | 36.76 | 41.32 | 50.52 | 57.15 | 56.76 | i | 65.15 | 64.10 | 57.95 | 49.69 | 42.07 | a | 40.85 | a | 49.48 | a | |||||||||
1957 | 33.20 | a | 39.98 | 44.12 | a | 51.15 | 58.44 | 61.33 | 61.44 | 61.47 | a | 63.88 | 50.90 | 42.33 | 41.53 | 50.81 | ||||||||||
1958 | 41.42 | 46.44 | a | 43.03 | 48.37 | 59.79 | 64.12 | 68.69 | 67.06 | 59.07 | 52.84 | 42.43 | 43.97 | 53.10 | ||||||||||||
1959 | 40.18 | 41.25 | 43.85 | 49.43 | 53.21 | 60.02 | 66.09 | c | 61.89 | 57.90 | 51.79 | 43.35 | 39.95 | 50.74 | ||||||||||||
1960 | 38.53 | 41.28 | 44.16 | 49.88 | 52.98 | 60.03 | 66.61 | 62.87 | 58.15 | 52.56 | 43.52 | 39.13 | 50.81 | |||||||||||||
1961 | 42.73 | 44.33 | a | 44.97 | 48.45 | 54.81 | 62.97 | 66.18 | 67.81 | 58.03 | 49.85 | 40.85 | 39.47 | a | 51.70 | |||||||||||
1962 | 37.95 | 42.84 | 42.47 | 50.47 | 51.82 | 59.08 | 63.35 | 62.90 | 59.21 | a | 52.39 | 46.02 | 42.19 | 50.89 | ||||||||||||
1963 | 34.43 | a | 47.43 | 43.65 | 48.78 | 55.79 | ----- | z | 62.29 | ----- | z | 63.05 | ----- | z | 44.45 | ----- | z | 49.98 | d | |||||||
1964 | ----- | z | ----- | z | 43.85 | 47.08 | 54.21 | 59.43 | a | 62.56 | 62.11 | 58.63 | 51.21 | 41.53 | a | 36.19 | 51.68 | b | ||||||||
1965 | 38.92 | 43.16 | 45.24 | b | 49.97 | 52.60 | 60.25 | 66.79 | 65.61 | 57.45 | 53.79 | 48.07 | 39.61 | 51.79 | ||||||||||||
1966 | 39.11 | 41.07 | 43.90 | a | 50.40 | 55.68 | 58.63 | 63.13 | 64.98 | a | 61.42 | 50.73 | a | 45.16 | a | 44.13 | 51.53 | |||||||||
1967 | 41.83 | a | 43.00 | 42.19 | 46.35 | 55.56 | 64.15 | 65.43 | a | 69.73 | 63.15 | 53.03 | 45.08 | 39.68 | 52.43 | |||||||||||
1968 | 39.02 | b | 44.14 | 47.03 | 48.22 | 55.74 | 59.42 | 65.50 | 62.97 | 59.29 | a | 50.06 | 45.42 | 36.55 | 51.11 | |||||||||||
1969 | 32.08 | 38.70 | 44.69 | 48.08 | 57.55 | 64.65 | 63.97 | 62.10 | 59.87 | 50.11 | 45.88 | 42.21 | 50.82 | |||||||||||||
1970 | 39.71 | 44.54 | 45.69 | 47.17 | 54.16 | 63.30 | 64.35 | a | 63.82 | 56.53 | a | 49.11 | 44.50 | 37.74 | 50.89 | |||||||||||
1971 | 39.56 | 41.11 | a | 40.79 | 48.02 | 56.08 | 57.23 | 65.82 | 67.34 | 57.53 | 50.40 | 45.62 | 37.87 | 50.62 | ||||||||||||
1972 | 36.65 | 39.97 | 45.84 | 45.13 | 57.61 | 60.60 | 64.92 | 66.13 | 56.58 | 49.34 | 44.23 | 36.87 | 50.32 | |||||||||||||
1973 | 37.55 | 41.57 | 45.15 | 49.18 | 56.65 | 59.17 | 64.53 | 60.81 | 59.79 | a | 51.21 | 41.78 | a | 42.65 | 50.84 | |||||||||||
1974 | 37.00 | 40.86 | 43.68 | 48.33 | 51.66 | 60.20 | 62.21 | 65.34 | 62.86 | a | 51.42 | a | 46.27 | b | 41.85 | 50.97 | ||||||||||
1975 | 39.31 | 39.21 | 42.24 | 45.47 | 54.47 | 58.23 | 64.81 | 61.76 | 59.75 | 50.66 | 44.30 | 40.06 | 50.02 | |||||||||||||
1976 | 41.19 | 40.27 | a | 41.33 | a | 47.62 | 54.79 | 57.30 | 62.77 | 62.00 | 60.48 | 52.13 | 44.92 | 41.35 | a | 50.51 | ||||||||||
1977 | 37.67 | a | 45.16 | 44.05 | 51.53 | 53.08 | 61.53 | 62.90 | 68.21 | 58.07 | 50.74 | 42.13 | 40.29 | 51.28 | ||||||||||||
1978 | 42.56 | 44.95 | 47.92 | 49.83 | a | 54.63 | 64.50 | 67.27 | 65.03 | 58.65 | 53.53 | a | 39.70 | 35.63 | 52.02 | |||||||||||
1979 | 34.06 | 40.38 | 47.82 | 50.67 | 56.89 | 60.85 | 66.19 | 65.00 | 62.18 | 53.84 | 42.28 | 43.52 | 51.97 | |||||||||||||
1980 | 34.87 | 42.83 | b | 44.74 | 52.18 | 55.76 | 58.42 | 65.42 | 63.35 | 60.57 | 53.18 | 47.13 | 44.02 | 51.87 | ||||||||||||
1981 | 42.24 | 43.84 | 48.69 | 49.83 | 55.84 | 59.10 | 64.27 | 68.68 | 60.63 | 49.56 | 45.37 | 40.53 | a | 52.38 | ||||||||||||
1982 | 38.68 | 41.30 | a | 44.02 | 46.67 | 55.82 | c | 62.42 | f | 63.64 | f | 64.54 | f | 61.28 | c | 51.37 | 41.25 | 38.74 | 46.57 | c | ||||||
1983 | 42.98 | 44.79 | 47.42 | 50.42 | 58.34 | c | 60.03 | a | 63.39 | c | 65.88 | c | 57.64 | a | 50.42 | a | 46.14 | a | 35.02 | b | 51.87 | |||||
1984 | 42.34 | 43.52 | a | 47.83 | a | 47.90 | a | 52.91 | h | 59.18 | b | 64.78 | d | 64.86 | c | 59.29 | a | 49.18 | a | 43.67 | 36.13 | 50.79 | a | |||
1985 | 36.32 | 39.27 | b | 43.32 | 50.22 | 56.37 | 61.10 | 69.26 | b | 65.35 | a | 57.72 | 51.47 | 36.32 | 36.45 | 50.26 | ||||||||||
1986 | 42.78 | a | 42.11 | 49.26 | 48.48 | 56.43 | d | 63.81 | a | 62.35 | a | 69.16 | 59.60 | 53.89 | 44.87 | 40.68 | 52.78 | |||||||||
1987 | 39.63 | 44.50 | 47.32 | 52.67 | 57.53 | a | 63.50 | 64.15 | 66.15 | 62.75 | 53.68 | a | 47.10 | 38.21 | 53.10 | |||||||||||
1988 | 38.19 | 43.71 | a | 44.98 | 50.88 | 55.18 | 59.43 | a | 65.27 | 65.23 | 60.05 | 55.28 | a | 44.90 | 40.08 | 51.93 | ||||||||||
1989 | 40.17 | a | 35.48 | 42.68 | 52.82 | 55.95 | 62.60 | 63.12 | a | 64.40 | 62.32 | 52.23 | a | 45.87 | 43.11 | 51.73 | ||||||||||
1990 | 41.70 | a | 39.09 | 46.18 | a | 52.67 | 55.53 | a | 60.13 | 67.72 | a | 67.48 | 63.55 | 50.10 | a | 45.65 | 34.39 | 52.02 | ||||||||
1991 | 38.50 | 46.57 | 42.97 | a | 48.79 | a | 54.43 | a | 58.21 | a | 66.84 | 66.52 | 62.42 | 50.98 | 46.60 | 42.55 | b | 52.11 | ||||||||
1992 | 42.43 | a | 45.45 | 50.19 | 51.97 | 59.89 | c | 64.73 | d | 66.82 | 66.81 | 59.13 | 53.35 | 44.55 | 37.88 | a | 53.60 | |||||||||
1993 | 35.79 | 39.38 | 46.76 | 50.27 | 60.19 | 61.05 | 61.94 | 65.42 | 61.57 | 54.00 | b | 40.53 | 40.22 | a | 51.43 | |||||||||||
1994 | 43.53 | a | 39.50 | 47.87 | 52.33 | 57.60 | a | 59.57 | 66.72 | a | 65.77 | c | 63.43 | 50.48 | 40.55 | 38.82 | 52.18 | |||||||||
1995 | 41.63 | 43.91 | 45.68 | 50.16 | a | 58.62 | a | 61.79 | a | 66.29 | c | 62.95 | a | ----- | z | 51.63 | 48.16 | a | 39.83 | a | 51.88 | a | ||||
1996 | 39.80 | a | 40.97 | 46.31 | 51.12 | 52.62 | a | 60.04 | c | 67.15 | a | ----- | z | 58.05 | 50.57 | a | 41.81 | a | 37.22 | b | 49.60 | a | ||||
1997 | 38.86 | c | 41.81 | a | 43.37 | a | 48.25 | 57.81 | b | 58.98 | c | 64.57 | b | 66.48 | c | 61.62 | a | 50.88 | b | 46.44 | c | 39.40 | f | 52.64 | a | |
1998 | 41.41 | c | 43.09 | 45.67 | d | 48.96 | c | 54.71 | e | 60.09 | c | 66.82 | i | 66.34 | c | 62.71 | a | 50.82 | a | 45.48 | a | 37.77 | a | 50.64 | a | |
1999 | 40.79 | b | 39.91 | 42.58 | 47.30 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.65 | h | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 38.87 | 41.58 | 44.67 | 49.48 | 55.71 | 60.32 | 64.53 | 64.62 | 59.92 | 51.67 | 44.08 | 39.90 | 51.36 | |||||||||||||
S.D. | 3.57 | 2.66 | 2.43 | 2.08 | 2.23 | 2.12 | 1.97 | 2.04 | 1.97 | 1.73 | 2.50 | 2.58 | 0.98 | |||||||||||||
SKEW | -0.96 | -0.31 | 0.35 | -0.06 | 0.12 | 0.47 | 0.06 | 0.36 | 0.31 | -0.02 | -0.45 | -0.11 | 0.02 | |||||||||||||
MAX | 46.34 | 47.43 | 50.19 | 54.55 | 60.32 | 64.73 | 69.26 | 69.73 | 63.88 | 55.28 | 48.63 | 45.44 | 53.60 | |||||||||||||
MIN | 27.45 | 34.24 | 39.71 | 44.55 | 51.48 | 56.41 | 59.67 | 60.81 | 56.53 | 47.48 | 36.32 | 34.39 | 48.72 | |||||||||||||
YRS | 67 | 67 | 67 | 66 | 65 | 62 | 63 | 63 | 65 | 67 | 68 | 64 | 50 |