| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.07 | 41.97 | k | 40.07 | ||
| 1930 | 24.29 | 44.55 | ----- | z | ----- | z | 52.02 | 57.98 | 62.06 | ----- | z | ----- | z | ----- | z | 43.53 | ----- | z | 47.41 | |||||||
| 1931 | ----- | z | 42.46 | d | 46.39 | i | 52.06 | d | 58.92 | e | 61.48 | 66.37 | a | 64.34 | ----- | z | ----- | z | ----- | z | ----- | z | 57.60 | |||
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.33 | ----- | z | ----- | z | ----- | z | 61.33 | ||
| 1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.44 | v | 65.18 | 62.27 | 55.26 | 42.07 | 41.52 | 53.26 | ||||||
| 1941 | 40.72 | a | 44.52 | 50.22 | a | 50.82 | 55.05 | 59.55 | 66.73 | 64.65 | 57.55 | 51.83 | d | 46.50 | 41.87 | a | 52.50 | |||||||||
| 1942 | 34.82 | 41.54 | 44.34 | 50.37 | 53.84 | 57.98 | 66.30 | k | ----- | z | 60.25 | p | 53.84 | 44.67 | 42.73 | 47.12 | ||||||||||
| 1943 | 33.33 | a | 42.61 | 43.73 | 52.87 | 51.93 | a | 57.03 | 62.06 | 62.39 | 61.80 | 53.28 | a | 44.52 | 37.61 | 50.26 | ||||||||||
| 1944 | 38.55 | 40.60 | 43.15 | 48.33 | 53.18 | 56.88 | 62.00 | 63.16 | 62.48 | 57.10 | 44.70 | 38.10 | 50.69 | |||||||||||||
| 1945 | 41.39 | 43.18 | 43.24 | 47.66 | a | 56.52 | 57.00 | a | 63.68 | 64.35 | 58.18 | 52.81 | 44.35 | 39.88 | a | 51.02 | ||||||||||
| 1946 | 40.47 | 42.78 | a | 45.12 | a | 49.03 | 57.03 | 57.90 | 62.42 | 63.29 | 57.72 | a | 48.18 | 42.67 | 40.55 | 50.60 | ||||||||||
| 1947 | 35.16 | 44.66 | 48.73 | a | 50.97 | 56.30 | a | 58.60 | 61.58 | 61.34 | 59.25 | 50.24 | 45.23 | 41.18 | 51.10 | |||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.20 | d | 58.58 | 56.77 | 49.94 | 40.17 | 34.33 | a | 49.83 | |||||
| 1949 | 25.65 | 37.05 | 43.55 | 49.70 | 55.00 | 56.78 | 60.10 | 62.41 | d | 62.55 | k | 46.12 | a | 48.07 | a | 39.04 | c | 47.59 | ||||||||
| 1950 | 26.83 | a | 39.04 | 42.19 | 47.21 | b | 52.95 | a | 59.98 | 62.07 | a | 65.39 | 59.53 | a | 50.15 | a | 46.78 | a | 46.69 | 49.90 | ||||||
| 1951 | 39.19 | 42.30 | 40.93 | b | 50.60 | 53.42 | 60.41 | a | 63.15 | 61.84 | 60.18 | 50.32 | 45.45 | 36.98 | 50.40 | |||||||||||
| 1952 | 36.13 | 41.57 | 42.90 | 49.98 | 54.77 | 56.81 | c | 66.53 | o | 66.54 | c | 65.42 | k | 56.20 | a | 40.63 | 41.92 | 48.75 | ||||||||
| 1953 | 46.44 | 42.25 | 44.42 | 48.02 | c | 53.19 | 56.50 | 64.21 | 64.97 | 61.65 | 54.71 | 47.95 | 42.48 | 52.23 | ||||||||||||
| 1954 | 38.98 | a | 43.55 | 43.18 | 48.60 | a | 55.95 | ----- | z | ----- | z | 61.15 | 58.08 | 51.10 | 48.20 | 40.45 | 48.92 | |||||||||
| 1955 | 39.16 | 41.05 | 41.45 | a | 45.40 | 52.70 | f | 63.55 | t | 60.76 | 61.77 | a | 58.38 | 52.44 | 39.82 | 39.69 | 47.99 | |||||||||
| 1956 | 40.24 | 34.88 | 43.02 | 51.50 | 58.27 | 57.02 | 65.37 | a | 63.17 | m | 59.28 | 49.97 | 41.28 | 38.95 | 49.07 | |||||||||||
| 1957 | 29.16 | 39.79 | 45.03 | a | 49.73 | 56.29 | 60.08 | e | 62.76 | d | 61.61 | 64.52 | a | 53.38 | b | 42.97 | 42.92 | 50.69 | ||||||||
| 1958 | 42.98 | 48.94 | a | 45.32 | a | 49.88 | b | 60.94 | 63.87 | 68.81 | 68.03 | 60.60 | a | 55.42 | 47.71 | b | 44.54 | c | 54.75 | |||||||
| 1959 | 40.60 | a | 41.41 | 44.98 | e | 49.85 | 53.32 | a | 60.58 | 65.72 | a | 63.16 | i | 58.48 | 53.57 | a | 43.43 | 39.08 | e | 50.09 | ||||||
| 1960 | 36.24 | 42.02 | a | 45.46 | c | 49.50 | b | 53.18 | 59.05 | 65.45 | 62.35 | a | 59.23 | b | 53.79 | 45.63 | d | 38.46 | c | 50.86 | ||||||
| 1961 | 42.85 | 45.85 | b | 45.92 | 47.91 | a | 54.52 | 61.90 | 65.61 | 68.60 | a | 57.63 | 51.35 | 41.55 | a | 39.97 | 51.97 | |||||||||
| 1962 | 36.95 | 42.00 | 43.31 | 50.62 | 50.94 | 58.63 | 62.77 | 63.50 | 61.30 | 53.61 | 47.45 | 41.76 | 51.07 | |||||||||||||
| 1963 | 33.44 | 47.34 | 44.29 | c | 48.25 | 55.05 | 59.27 | b | 60.41 | i | 63.27 | 63.10 | 53.93 | a | 46.41 | a | 39.82 | 50.38 | ||||||||
| 1964 | 41.35 | 40.78 | 42.94 | 45.72 | 51.35 | 57.38 | 62.60 | 61.26 | 57.05 | 53.06 | 41.87 | 37.94 | 49.44 | |||||||||||||
| 1965 | 39.85 | 41.70 | 45.55 | c | 49.85 | 51.24 | 57.84 | b | 66.28 | b | 65.30 | c | 57.15 | 54.74 | 47.24 | a | 37.58 | 51.19 | ||||||||
| 1966 | 38.85 | 40.93 | 44.65 | 50.52 | 53.93 | c | 58.62 | 62.35 | 63.69 | 61.40 | 51.13 | 45.78 | 43.56 | 51.28 | ||||||||||||
| 1967 | 43.45 | 42.45 | 42.82 | 45.27 | 54.08 | 62.15 | 64.30 | a | 69.18 | 64.05 | 52.92 | 45.13 | 40.16 | 52.16 | ||||||||||||
| 1968 | 38.90 | a | 46.47 | 47.47 | 47.19 | c | 54.21 | 59.18 | 61.87 | 62.13 | 59.73 | 50.55 | 45.02 | 36.92 | 50.80 | |||||||||||
| 1969 | 31.50 | 39.71 | 45.24 | 49.17 | 56.82 | a | 63.73 | 62.79 | 61.17 | a | 60.28 | 50.82 | 45.38 | 41.96 | h | 51.51 | ||||||||||
| 1970 | 38.90 | 45.07 | 44.50 | 45.83 | 53.39 | 62.15 | 64.31 | 63.95 | 57.10 | 50.44 | 45.95 | 38.27 | 50.82 | |||||||||||||
| 1971 | 38.34 | 41.54 | 41.36 | c | 47.53 | 54.45 | a | 56.22 | 65.24 | 66.27 | 57.78 | 50.06 | 44.82 | 38.60 | 50.18 | |||||||||||
| 1972 | 37.34 | 41.62 | 47.95 | 46.75 | 57.94 | 60.58 | 66.80 | u | ----- | z | 58.32 | b | 51.35 | a | 45.00 | 35.03 | a | 48.19 | ||||||||
| 1973 | 37.34 | 43.46 | 45.15 | a | 49.32 | 56.40 | 60.36 | a | 66.06 | 61.10 | 61.90 | 52.13 | 43.22 | 43.17 | b | 51.63 | ||||||||||
| 1974 | 36.76 | 41.29 | 45.82 | f | 49.02 | a | 51.87 | 61.15 | 61.74 | j | 65.29 | 64.24 | a | 52.24 | ----- | z | 41.79 | 51.52 | ||||||||
| 1975 | ----- | z | ----- | z | 40.68 | 43.63 | 53.73 | e | ----- | z | 62.65 | 59.08 | f | 63.57 | b | 52.11 | 42.88 | b | 41.13 | a | 50.05 | |||||
| 1976 | 40.48 | a | 39.35 | l | 41.79 | 47.37 | c | 54.05 | 56.60 | ----- | z | ----- | z | 60.58 | 51.66 | 46.22 | a | 38.85 | 48.62 | |||||||
| 1977 | 35.26 | 43.75 | 42.60 | 51.12 | 51.66 | 60.82 | 62.05 | 68.47 | 58.42 | 52.02 | 43.50 | 42.44 | 51.01 | |||||||||||||
| 1978 | 40.81 | 45.34 | 48.68 | a | 50.15 | 53.37 | 63.15 | 65.13 | 62.85 | k | 58.90 | 53.35 | 39.27 | 37.07 | c | 50.47 | ||||||||||
| 1979 | 31.97 | b | 39.59 | l | 47.80 | a | 49.48 | 55.17 | a | 59.85 | 64.98 | 63.29 | 62.10 | 55.16 | 42.75 | 43.76 | 52.39 | |||||||||
| 1980 | 33.63 | 41.38 | 44.16 | 51.02 | 54.02 | 56.97 | 64.48 | a | 61.61 | 59.38 | 52.40 | 46.38 | 42.82 | 50.69 | ||||||||||||
| 1981 | 42.02 | a | 42.38 | 47.35 | 49.42 | 54.32 | 58.05 | 62.92 | 67.48 | 60.77 | 50.61 | 46.80 | 41.53 | 51.97 | ||||||||||||
| 1982 | 36.81 | 41.32 | 44.39 | 45.85 | 54.31 | 61.73 | 62.74 | 64.27 | 61.03 | m | ----- | z | ----- | z | 35.80 | u | 51.43 | |||||||||
| 1983 | 43.45 | 45.95 | 48.63 | 49.38 | 56.82 | 58.42 | 61.82 | 63.85 | 56.80 | 50.03 | 47.68 | 34.79 | 51.47 | |||||||||||||
| 1984 | 40.53 | 43.41 | 48.29 | 47.50 | 52.42 | 57.42 | 63.02 | 63.82 | 58.97 | 49.76 | 44.52 | 36.40 | 50.50 | |||||||||||||
| 1985 | 34.10 | 37.91 | 42.87 | 49.45 | 54.44 | 58.87 | 68.23 | 62.97 | 56.25 | 50.08 | 36.08 | 32.08 | 48.61 | |||||||||||||
| 1986 | 41.98 | 43.02 | 49.55 | 47.53 | 53.89 | 62.80 | 60.89 | 68.13 | 57.88 | 53.58 | 44.97 | 37.85 | 51.84 | |||||||||||||
| 1987 | 38.08 | 43.80 | 47.03 | 51.50 | 57.48 | 61.02 | 62.94 | 65.10 | 61.77 | 54.45 | 46.35 | 36.94 | 52.20 | |||||||||||||
| 1988 | 37.68 | 42.03 | 45.34 | 50.32 | 53.87 | 58.78 | 63.76 | 62.92 | 59.78 | 54.76 | 45.17 | 39.53 | 51.16 | |||||||||||||
| 1989 | 40.15 | 33.89 | 43.94 | 52.02 | 55.23 | 61.22 | 61.53 | 62.58 | 61.00 | 51.44 | 45.65 | 38.52 | 50.60 | |||||||||||||
| 1990 | 41.24 | 39.11 | 47.06 | 51.73 | 53.69 | 60.23 | 66.65 | 66.60 | 62.95 | 49.45 | 45.23 | 32.52 | 51.37 | |||||||||||||
| 1991 | 37.48 | 47.12 | 43.27 | 48.15 | 51.82 | 56.37 | 64.76 | 65.97 | 62.30 | 52.06 | 45.75 | 40.47 | 51.29 | |||||||||||||
| 1992 | 42.50 | 47.29 | 50.13 | 53.08 | 58.29 | 63.12 | 66.87 | a | 66.63 | 58.55 | 53.90 | 43.53 | 37.61 | 53.46 | ||||||||||||
| 1993 | 34.87 | 38.34 | 46.77 | 49.90 | 58.47 | 58.98 | 60.03 | 64.05 | 60.92 | 53.60 | 37.60 | 38.18 | 50.14 | |||||||||||||
| 1994 | 41.52 | 39.02 | 48.19 | 50.97 | 56.76 | 58.28 | 65.58 | 65.31 | 62.75 | 49.63 | 39.47 | 40.74 | 51.52 | |||||||||||||
| 1995 | 42.10 | 44.07 | 45.82 | 48.45 | 56.97 | 59.78 | 65.98 | 62.21 | 63.40 | 51.90 | 48.83 | 40.58 | 52.51 | |||||||||||||
| 1996 | 40.25 | a | 41.02 | a | 45.79 | 50.97 | 52.65 | 58.65 | 67.06 | 64.90 | 57.57 | 51.05 | 43.80 | 40.26 | 51.16 | |||||||||||
| 1997 | 39.50 | 41.64 | 45.35 | 48.90 | 58.61 | 59.12 | 64.10 | 67.27 | 62.38 | 50.95 | 48.33 | 38.76 | 52.08 | |||||||||||||
| 1998 | 42.63 | 45.09 | 46.87 | 50.03 | 54.21 | 60.23 | 67.35 | 66.18 | 62.28 | 50.97 | 46.95 | 38.61 | 52.62 | |||||||||||||
| 1999 | 40.76 | 42.75 | 43.89 | 48.03 | 52.15 | 58.88 | 63.03 | 65.55 | 60.55 | 52.02 | 47.98 | 41.87 | 51.45 | |||||||||||||
| 2000 | 38.34 | 42.52 | 43.27 | 51.68 | 55.56 | 61.12 | 63.48 | 63.69 | 60.47 | 51.44 | 40.18 | 39.11 | 50.91 | |||||||||||||
| 2001 | 39.58 | 40.25 | 45.71 | 47.57 | 57.42 | 59.80 | 63.89 | 66.02 | 61.00 | 50.41 | b | 46.43 | 38.82 | 51.41 | ||||||||||||
| 2002 | 39.23 | 41.11 | 42.15 | 49.83 | 52.98 | 61.37 | 65.76 | 64.85 | 60.97 | 50.21 | 45.17 | 42.24 | 51.32 | |||||||||||||
| 2003 | 44.32 | 42.27 | 47.21 | 49.47 | 55.95 | 62.48 | 66.61 | 65.66 | 62.50 | 55.27 | 41.27 | 40.63 | 52.80 | |||||||||||||
| 2004 | 36.19 | 43.09 | 48.52 | 53.50 | 55.97 | 62.48 | 68.24 | 67.87 | 59.65 | 53.89 | 43.70 | 41.44 | 52.88 | |||||||||||||
| 2005 | 40.55 | 41.45 | 47.89 | 50.47 | 57.90 | 58.38 | 66.10 | 66.39 | 57.60 | 54.21 | 42.48 | a | 38.29 | 51.81 | ||||||||||||
| 2006 | 44.00 | 39.52 | 44.42 | 51.25 | ----- | z | 62.53 | 66.08 | 63.95 | 60.88 | 50.35 | 44.68 | 38.18 | 51.44 | ||||||||||||
| 2007 | 35.31 | 42.39 | 47.13 | 48.32 | 53.81 | 59.22 | 66.52 | 64.05 | 58.38 | 50.15 | 42.73 | 38.69 | 50.56 | |||||||||||||
| 2008 | 36.10 | 41.97 | 41.94 | 45.45 | 55.32 | 57.30 | 63.85 | 65.50 | 60.57 | 51.12 | a | 46.58 | 35.92 | 50.13 | ||||||||||||
| 2009 | 36.52 | 39.25 | 41.90 | 47.85 | 55.52 | 61.13 | 68.89 | 65.30 | a | 61.60 | 50.31 | 44.53 | 34.24 | 50.59 | ||||||||||||
| 2010 | 45.11 | 45.93 | 46.87 | 48.62 | 52.15 | 56.90 | 63.42 | 64.23 | 60.42 | 52.16 | 42.87 | 41.23 | 51.66 | |||||||||||||
| 2011 | 39.31 | 38.12 | 44.10 | 44.88 | 51.10 | 57.79 | a | 61.61 | 64.71 | 63.00 | 51.97 | 41.95 | 36.48 | 49.59 | ||||||||||||
| 2012 | 38.68 | 41.16 | 41.92 | 49.45 | 53.29 | 57.52 | 63.56 | 65.74 | 60.17 | 51.89 | 46.08 | 40.15 | 50.80 | |||||||||||||
| 2013 | 34.74 | 41.21 | 46.52 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.83 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 38.25 | 42.12 | 45.04 | 49.16 | 54.70 | 59.46 | 64.11 | 64.41 | 60.22 | 52.06 | 44.32 | 39.47 | 51.25 | |||||||||||||
| S.D. | 4.28 | 2.72 | 2.36 | 2.04 | 2.18 | 2.04 | 2.23 | 2.16 | 2.09 | 1.99 | 2.68 | 2.75 | 1.04 | |||||||||||||
| SKEW | -1.05 | -0.22 | 0.26 | -0.38 | 0.45 | 0.34 | 0.14 | -0.03 | 0.04 | 0.09 | -0.71 | -0.28 | 0.57 | |||||||||||||
| MAX | 46.44 | 48.94 | 50.22 | 53.50 | 60.94 | 63.87 | 68.89 | 69.18 | 64.52 | 57.10 | 48.83 | 46.69 | 54.75 | |||||||||||||
| MIN | 24.29 | 33.89 | 40.68 | 43.63 | 50.94 | 56.22 | 59.20 | 58.58 | 56.25 | 46.12 | 36.08 | 32.08 | 48.61 | |||||||||||||
| NO YRS | 72 | 71 | 71 | 72 | 71 | 70 | 67 | 67 | 70 | 72 | 73 | 71 | 54 | |||||||||||||