| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1932 | 27.00 | d | 25.67 | 41.18 | 42.05 | 50.34 | 59.67 | 61.00 | 59.65 | 57.37 | 45.81 | 39.70 | 23.06 | 44.37 | ||||||||||||
| 1933 | 23.81 | 22.73 | 37.31 | 43.77 | 44.90 | 57.43 | 64.77 | 61.90 | 52.40 | 49.73 | 37.53 | 34.60 | 44.24 | |||||||||||||
| 1934 | 34.85 | 38.11 | 45.77 | 49.48 | 54.35 | 55.72 | 62.13 | 63.32 | 55.18 | 47.81 | b | 40.28 | 33.34 | 48.36 | ||||||||||||
| 1935 | 27.18 | 35.36 | 34.63 | 43.42 | 51.02 | 58.35 | 62.72 | a | 62.94 | 58.05 | 44.93 | b | 34.07 | 31.73 | 45.36 | |||||||||||
| 1936 | 33.34 | 35.64 | 39.29 | 47.03 | 52.92 | 58.83 | 65.45 | 64.21 | 55.45 | 49.87 | 36.22 | 29.53 | 47.32 | |||||||||||||
| 1937 | 13.20 | a | 28.43 | 39.05 | 42.10 | 53.73 | 58.47 | 66.26 | 61.97 | 57.25 | 49.55 | 39.52 | 35.15 | 45.39 | ||||||||||||
| 1938 | 34.52 | 29.55 | 35.27 | 44.80 | 51.00 | 61.23 | 67.10 | 61.73 | 58.62 | 47.40 | 34.48 | 32.26 | 46.50 | |||||||||||||
| 1939 | 29.76 | 30.14 | 41.35 | 49.42 | 53.52 | 57.20 | 65.87 | 65.26 | 56.08 | d | 48.39 | 40.03 | 37.25 | a | 47.86 | |||||||||||
| 1940 | 36.21 | 37.76 | 42.27 | 46.53 | 55.02 | 63.53 | 63.10 | 64.82 | 54.78 | 48.00 | 35.82 | 33.50 | 48.45 | |||||||||||||
| 1941 | 34.50 | 38.29 | 40.81 | 43.38 | 52.47 | a | 55.75 | 65.74 | 61.13 | 51.77 | 45.32 | 40.88 | 32.44 | 46.87 | ||||||||||||
| 1942 | 26.44 | 32.52 | 36.94 | 43.63 | 47.63 | 55.93 | 65.63 | 63.53 | 55.88 | 48.31 | 37.95 | 33.69 | 45.67 | |||||||||||||
| 1943 | 28.48 | 32.25 | 40.77 | 49.25 | 53.50 | 53.42 | 67.45 | 64.37 | 64.40 | 48.31 | 39.63 | 32.85 | 47.89 | |||||||||||||
| 1944 | 29.62 | f | 34.22 | 38.81 | 43.67 | 53.42 | 56.33 | 67.05 | 64.37 | 60.07 | 52.48 | 33.18 | 32.27 | 48.72 | ||||||||||||
| 1945 | 32.50 | 36.46 | 37.55 | 45.23 | 52.55 | 59.18 | 69.89 | 66.08 | 57.72 | 52.19 | 37.23 | 31.68 | 48.19 | |||||||||||||
| 1946 | 28.18 | 31.30 | 40.03 | 48.25 | 55.35 | 58.15 | 67.44 | 67.94 | 56.97 | 43.61 | 37.03 | a | 33.97 | 47.35 | ||||||||||||
| 1947 | 27.66 | 40.39 | 43.18 | 48.95 | 59.32 | 56.73 | 63.45 | 62.52 | 58.90 | 49.27 | 36.93 | 33.89 | 48.43 | |||||||||||||
| 1948 | 34.63 | 32.72 | 35.81 | 39.93 | 49.35 | 60.72 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.19 | |||||||
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1950 | ----- | z | 37.16 | f | 37.47 | 43.43 | 51.65 | 57.32 | 66.07 | a | 64.27 | 56.44 | c | 48.48 | b | 40.98 | c | 37.85 | g | 51.79 | ||||||
| 1951 | 31.37 | 33.46 | 35.85 | 48.37 | 51.84 | 60.60 | 64.66 | 62.74 | 58.82 | 45.30 | a | 37.83 | 24.47 | 46.28 | ||||||||||||
| 1952 | 25.05 | 31.76 | 34.90 | 47.13 | 53.53 | a | 55.80 | 67.52 | e | 62.47 | a | 59.38 | 50.97 | 32.73 | 27.46 | f | 47.39 | |||||||||
| 1953 | 35.60 | 35.70 | 36.62 | a | 42.00 | 45.24 | 52.27 | 64.69 | 60.79 | 59.10 | 46.11 | 40.07 | 33.10 | 45.94 | ||||||||||||
| 1954 | 30.56 | 37.30 | 34.90 | 44.85 | 54.55 | 55.03 | 63.37 | 56.68 | 51.55 | 43.13 | 38.42 | 29.55 | 44.99 | |||||||||||||
| 1955 | 24.78 | a | 29.31 | b | 36.97 | 38.82 | 50.13 | 58.87 | 61.05 | 62.73 | 53.95 | a | 47.68 | 34.50 | 33.92 | f | 45.34 | |||||||||
| 1956 | 32.76 | 26.34 | 36.95 | 46.45 | 52.29 | 56.48 | 64.00 | 60.24 | 56.00 | 42.03 | 36.47 | 29.40 | 44.95 | |||||||||||||
| 1957 | 24.00 | 35.79 | 39.47 | 43.98 | 52.31 | 60.93 | 62.60 | 60.39 | 60.17 | 44.92 | 35.95 | 33.85 | 46.20 | |||||||||||||
| 1958 | 33.23 | 40.07 | 35.39 | 42.77 | 57.23 | 59.40 | 66.53 | 67.58 | 57.15 | 51.77 | 40.20 | 38.03 | 49.11 | |||||||||||||
| 1959 | 34.81 | 32.25 | 39.19 | 47.88 | 48.65 | 60.60 | 67.56 | 63.02 | b | 54.98 | 50.18 | a | 38.13 | 27.45 | 47.06 | |||||||||||
| 1960 | 29.21 | 33.71 | 41.05 | 43.52 | 49.73 | a | 62.27 | 69.06 | 62.61 | 59.88 | 48.21 | 35.77 | d | 32.68 | 47.31 | |||||||||||
| 1961 | 34.50 | 36.14 | c | 38.45 | 44.43 | 49.92 | a | 63.35 | 65.72 | b | 66.90 | b | 54.68 | b | 48.00 | 35.62 | a | 30.85 | 47.38 | |||||||
| 1962 | 22.19 | 30.07 | a | 36.78 | a | 47.70 | 48.56 | 58.15 | 63.26 | 61.77 | 59.71 | a | 48.36 | b | 43.22 | l | 34.14 | i | 47.66 | |||||||
| 1963 | 28.84 | 42.41 | 38.04 | d | 38.98 | 53.63 | 56.75 | 60.43 | a | 61.12 | a | 60.18 | 49.63 | a | 38.74 | a | 33.13 | 46.82 | ||||||||
| 1964 | 28.47 | 25.76 | 35.32 | 41.92 | 49.44 | 56.00 | a | 64.40 | 61.84 | 54.68 | 50.95 | 35.59 | a | 33.72 | b | 44.84 | ||||||||||
| 1965 | 29.55 | 36.63 | b | 39.37 | 46.12 | 50.32 | 58.58 | 64.68 | a | 61.90 | 54.10 | 50.75 | a | 37.38 | 27.42 | a | 46.40 | |||||||||
| 1966 | 31.15 | g | ----- | z | 41.54 | h | 47.40 | a | 56.15 | a | 56.52 | b | 61.90 | 64.95 | 59.53 | 49.05 | b | 36.48 | f | 34.26 | 53.72 | |||||
| 1967 | 32.82 | 37.46 | b | 35.47 | 36.08 | 52.58 | 59.50 | 67.82 | 68.76 | b | 61.25 | 47.73 | a | 40.15 | 23.48 | b | 46.93 | |||||||||
| 1968 | 29.29 | 40.47 | 41.19 | b | 44.23 | 51.63 | a | 60.63 | 68.65 | 61.37 | 57.78 | 48.76 | 38.24 | a | 28.73 | 47.58 | ||||||||||
| 1969 | 28.66 | 32.48 | 38.18 | 43.67 | 57.13 | 59.95 | 65.66 | 63.55 | 59.38 | 44.58 | 39.05 | a | 34.29 | 47.22 | ||||||||||||
| 1970 | 34.08 | 39.04 | 38.63 | 39.43 | 53.58 | a | 62.73 | 67.85 | a | 65.06 | 54.77 | 47.05 | b | 40.77 | 27.92 | 47.58 | ||||||||||
| 1971 | 32.35 | 34.62 | 35.26 | d | 42.30 | 51.08 | 57.52 | a | 66.12 | b | 67.53 | 54.10 | a | 43.30 | d | 37.93 | 23.84 | b | 45.50 | |||||||
| 1972 | 24.15 | d | 35.95 | 43.93 | a | 42.53 | a | 53.65 | 62.03 | 67.13 | 65.23 | 54.70 | 47.57 | b | 36.10 | 24.95 | b | 46.49 | ||||||||
| 1973 | 29.13 | 37.73 | ----- | z | 45.34 | a | 57.32 | a | 60.68 | 66.55 | 63.37 | 57.62 | ----- | z | 36.83 | ----- | z | 50.51 | ||||||||
| 1974 | 28.81 | 33.82 | c | 38.98 | a | 42.38 | a | 50.92 | a | 62.60 | 64.38 | a | 64.87 | 61.15 | 48.68 | 39.35 | 31.98 | d | 47.33 | |||||||
| 1975 | 24.65 | g | 33.21 | d | 37.19 | 38.22 | 52.19 | 58.00 | b | 65.76 | 60.81 | 60.92 | 46.00 | 35.85 | 32.96 | d | 47.37 | |||||||||
| 1976 | 34.38 | g | 34.52 | f | 35.39 | c | 41.75 | 53.73 | a | 56.33 | 66.03 | 59.48 | 59.13 | 49.07 | a | 41.12 | a | 30.28 | f | 51.34 | ||||||
| 1977 | 15.00 | i | 32.39 | f | 34.26 | d | 47.10 | 45.45 | 63.30 | 64.35 | 65.98 | 56.25 | 48.92 | 38.45 | a | 34.13 | d | 49.82 | ||||||||
| 1978 | 37.47 | b | 37.37 | a | 45.10 | a | 43.37 | c | 50.90 | a | 59.57 | 65.27 | 62.92 | 54.07 | b | 51.21 | 34.42 | 26.27 | 47.33 | |||||||
| 1979 | 29.69 | b | 35.14 | 42.53 | 43.78 | 54.52 | 59.78 | 65.55 | 62.92 | 60.47 | 51.97 | 34.43 | 34.52 | 47.94 | ||||||||||||
| 1980 | 33.94 | 40.05 | 37.48 | 46.80 | 51.02 | 55.15 | 65.61 | 62.23 | 58.62 | 50.47 | 38.98 | 32.63 | 47.75 | |||||||||||||
| 1981 | 36.18 | 36.91 | 40.21 | 46.95 | 52.48 | 59.90 | 65.10 | 66.82 | 59.12 | 46.58 | 41.30 | 36.74 | 49.02 | |||||||||||||
| 1982 | 28.35 | 35.09 | 36.66 | 39.97 | 52.65 | 59.67 | 63.29 | 63.95 | 54.50 | 45.97 | 34.13 | 28.73 | 45.25 | |||||||||||||
| 1983 | 32.47 | 37.68 | 39.13 | 39.95 | 53.18 | 56.63 | 60.24 | 63.35 | 56.50 | 49.10 | 35.80 | 30.58 | a | 46.22 | ||||||||||||
| 1984 | 29.16 | 34.21 | 40.44 | 42.42 | 53.58 | 57.35 | 67.65 | 64.19 | 56.30 | 43.87 | 35.45 | 24.55 | 45.76 | |||||||||||||
| 1985 | 26.55 | 32.77 | 36.15 | 48.43 | 51.66 | 62.63 | 67.52 | 61.05 | 52.18 | ----- | z | 28.30 | 28.31 | 45.05 | ||||||||||||
| 1986 | 39.13 | 39.54 | ----- | z | ----- | z | 52.74 | ----- | z | 62.69 | 67.18 | 51.20 | 48.19 | 37.42 | 31.31 | 47.71 | ||||||||||
| 1987 | 27.94 | 35.80 | 39.23 | 49.48 | 55.13 | 63.02 | 60.61 | 64.65 | 58.73 | 52.95 | 39.12 | 28.06 | 47.89 | |||||||||||||
| 1988 | 24.95 | 34.53 | 40.65 | 47.18 | 50.02 | 59.72 | 67.31 | 64.66 | 57.83 | 53.95 | 37.53 | 29.26 | 47.30 | |||||||||||||
| 1989 | 19.24 | 22.48 | 39.89 | 49.38 | 52.06 | 61.05 | ----- | z | 59.94 | 56.30 | 45.34 | 34.73 | 28.74 | 42.65 | ||||||||||||
| 1990 | 29.19 | 29.07 | ----- | z | ----- | z | 47.29 | 55.42 | 63.40 | 60.48 | 56.08 | ----- | z | 35.92 | 23.26 | 44.46 | ||||||||||
| 1991 | 30.11 | 40.14 | 35.85 | 41.80 | ----- | z | ----- | z | 66.79 | 63.77 | 59.37 | 48.23 | 36.83 | 28.00 | 45.09 | |||||||||||
| 1992 | 30.13 | 36.52 | 39.97 | ----- | z | 59.85 | 63.27 | 65.16 | ----- | z | 56.77 | 48.35 | 35.03 | 22.16 | 45.72 | |||||||||||
| 1993 | 19.55 | 24.54 | 41.55 | ----- | z | 54.79 | 57.57 | 58.87 | 61.50 | 56.32 | 48.21 | 29.70 | 28.16 | 43.70 | ||||||||||||
| 1994 | 31.95 | 31.27 | 40.50 | 44.92 | 54.65 | 59.80 | ----- | z | 63.45 | 59.70 | 45.77 | 29.75 | 26.92 | 44.43 | ||||||||||||
| 1995 | 35.74 | 40.25 | 38.26 | 42.67 | 52.11 | 56.80 | 63.29 | 61.10 | 59.02 | 46.89 | 42.43 | 35.50 | 47.84 | |||||||||||||
| 1996 | 32.84 | 36.74 | 40.27 | 44.95 | 49.94 | 58.95 | 67.92 | 64.81 | 54.57 | 46.63 | 38.05 | 33.35 | 47.42 | |||||||||||||
| 1997 | 31.10 | 33.52 | 40.37 | 43.85 | 56.55 | 57.18 | 63.40 | 63.29 | 56.60 | 45.26 | 38.73 | 28.56 | 46.53 | |||||||||||||
| 1998 | 34.76 | 34.59 | 39.39 | 42.50 | 46.37 | 57.13 | 67.71 | 65.56 | 59.75 | 44.47 | 34.65 | 24.84 | 45.98 | |||||||||||||
| 1999 | 30.60 | 29.66 | 35.21 | 42.17 | 49.60 | 56.47 | 62.18 | 62.15 | 57.40 | 48.70 | a | 41.02 | 29.43 | a | 45.38 | |||||||||||
| 2000 | 31.37 | 36.57 | 38.79 | 48.25 | 52.68 | 61.88 | a | 63.48 | 64.39 | 56.70 | 47.26 | 31.98 | 32.85 | 47.18 | ||||||||||||
| 2001 | 32.31 | 32.05 | 41.60 | 41.05 | a | ----- | z | 57.88 | 64.02 | 66.11 | 58.65 | 49.68 | a | 37.63 | 30.73 | 46.52 | ||||||||||
| 2002 | 29.87 | 36.93 | 36.79 | 46.12 | 51.71 | 61.80 | 68.60 | 62.21 | 57.88 | 47.68 | 38.73 | 34.05 | 47.70 | |||||||||||||
| 2003 | 39.65 | 34.32 | 40.97 | 40.57 | 52.76 | 62.77 | 70.53 | 65.42 | 60.02 | 52.69 | 35.37 | 34.44 | 49.12 | |||||||||||||
| 2004 | 32.73 | 35.53 | 45.00 | 46.83 | 52.79 | 61.38 | 67.15 | 65.60 | 56.03 | 47.29 | 36.53 | 33.56 | 48.37 | |||||||||||||
| 2005 | 31.02 | 36.48 | 41.19 | 44.32 | 53.82 | ----- | z | 69.03 | 66.82 | 55.35 | 48.52 | 36.17 | 33.42 | 46.92 | ||||||||||||
| 2006 | 34.23 | 34.46 | 33.45 | 45.08 | ----- | z | 62.90 | ----- | z | 63.84 | 58.60 | 46.66 | 38.62 | 32.84 | 45.07 | |||||||||||
| 2007 | 28.19 | 35.43 | 44.18 | 46.87 | 55.11 | 59.82 | 69.02 | 64.95 | 56.07 | 46.40 | 38.60 | 28.32 | 47.75 | |||||||||||||
| 2008 | 24.97 | 30.12 | 36.66 | 41.87 | 53.48 | 58.30 | 67.03 | 65.87 | 58.83 | 48.60 | 41.25 | 28.47 | 46.29 | |||||||||||||
| 2009 | 33.29 | 36.07 | 37.60 | 44.40 | 55.94 | 60.00 | 68.05 | 64.03 | 61.82 | 46.19 | 36.73 | 27.06 | 47.60 | |||||||||||||
| 2010 | 36.81 | 35.55 | 38.55 | 40.58 | 45.50 | 57.48 | 66.10 | 63.32 | 57.30 | 50.84 | 35.37 | 34.48 | 46.82 | |||||||||||||
| 2011 | 30.97 | 31.00 | 37.43 | a | 40.70 | 46.37 | 55.57 | 63.15 | 65.02 | 60.92 | 47.66 | 36.80 | 29.69 | 45.44 | ||||||||||||
| 2012 | 32.40 | 34.28 | 38.23 | 45.63 | 52.23 | a | 56.62 | 64.84 | 66.13 | 60.38 | 49.50 | a | 39.65 | 30.71 | 47.55 | |||||||||||
| 2013 | 23.52 | 33.14 | 40.85 | a | 44.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.00 | z | 32.50 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 30.25 | 34.19 | 38.77 | 44.24 | 52.19 | 58.86 | 65.31 | 63.56 | 57.32 | 48.02 | 37.14 | 30.71 | 46.89 | |||||||||||||
| S.D. | 4.67 | 4.16 | 2.74 | 3.05 | 3.08 | 2.58 | 2.46 | 2.26 | 2.60 | 2.47 | 2.77 | 3.70 | 1.20 | |||||||||||||
| SKEW | -0.81 | -0.74 | 0.39 | -0.16 | -0.26 | 0.02 | -0.34 | -0.11 | -0.17 | 0.01 | -0.74 | -0.45 | -0.31 | |||||||||||||
| MAX | 39.65 | 42.41 | 45.77 | 49.48 | 59.85 | 63.53 | 70.53 | 68.76 | 64.40 | 53.95 | 42.43 | 38.03 | 49.12 | |||||||||||||
| MIN | 13.20 | 22.48 | 33.45 | 36.08 | 44.90 | 52.27 | 58.87 | 56.68 | 51.20 | 42.03 | 28.30 | 22.16 | 44.24 | |||||||||||||
| NO YRS | 75 | 77 | 77 | 76 | 77 | 77 | 76 | 78 | 79 | 76 | 77 | 73 | 58 | |||||||||||||