| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1942 | 37.53 | a | 35.79 | 37.06 | 44.83 | 46.00 | 55.10 | 62.58 | 59.74 | 53.90 | 48.29 | 39.37 | 33.10 | 46.11 | ||||||||||||
| 1943 | ----- | z | ----- | z | 41.23 | 47.47 | 51.61 | 52.83 | 62.23 | 58.16 | 57.77 | 48.00 | 39.13 | 37.39 | 49.58 | |||||||||||
| 1944 | 35.45 | 36.48 | 39.90 | 43.93 | 52.65 | 55.07 | 61.39 | 59.32 | 57.07 | 51.03 | 39.40 | 35.13 | 47.24 | |||||||||||||
| 1945 | 34.13 | 39.93 | 38.97 | 45.77 | 51.45 | 59.17 | 66.68 | 62.81 | 59.67 | 52.74 | 40.57 | 38.97 | 49.24 | |||||||||||||
| 1946 | 31.81 | 34.50 | 41.74 | 47.23 | 53.03 | 57.29 | f | 64.74 | 62.90 | 56.97 | 45.45 | 39.43 | 36.45 | 46.75 | ||||||||||||
| 1947 | 28.58 | 38.89 | 44.42 | 48.17 | 56.55 | 60.50 | 60.94 | 60.52 | 58.80 | 50.71 | 36.80 | 33.16 | 48.17 | |||||||||||||
| 1948 | 35.10 | 36.28 | 39.58 | 46.80 | 49.45 | 58.90 | 62.13 | 60.90 | 55.87 | 49.61 | 37.57 | 34.61 | 47.23 | |||||||||||||
| 1949 | 26.61 | 34.79 | 42.35 | 48.63 | 52.77 | 60.77 | 64.23 | 60.55 | 58.76 | a | 47.10 | b | 43.13 | 33.48 | 47.77 | |||||||||||
| 1950 | 32.81 | 38.46 | 39.71 | 47.48 | a | 53.39 | 57.40 | 67.55 | 62.80 | a | 58.86 | a | 51.10 | 46.47 | 43.42 | 49.95 | ||||||||||
| 1951 | 36.84 | 37.07 | 39.45 | 47.59 | a | 53.97 | 59.63 | 63.97 | 62.68 | 59.20 | 47.81 | 41.73 | 35.77 | 48.81 | ||||||||||||
| 1952 | 36.32 | 38.24 | 38.68 | 46.00 | 53.87 | 54.13 | 65.71 | 62.97 | 58.43 | 51.94 | 38.07 | 39.26 | 48.63 | |||||||||||||
| 1953 | 40.87 | 34.61 | 38.23 | 45.23 | 47.55 | 55.63 | 66.19 | 60.29 | 59.30 | 45.06 | 42.37 | 32.26 | 47.30 | |||||||||||||
| 1954 | 34.74 | 39.46 | 39.58 | 49.10 | 53.97 | 56.80 | 65.94 | 58.65 | 53.70 | 46.58 | 39.90 | 35.58 | 47.83 | |||||||||||||
| 1955 | 32.23 | 33.93 | 38.00 | 40.07 | 51.61 | 56.03 | 60.03 | 63.58 | 57.00 | 48.42 | 37.90 | 42.65 | 46.79 | |||||||||||||
| 1956 | 40.94 | 33.17 | 37.87 | 44.90 | 51.81 | 57.83 | 63.81 | 59.26 | 57.90 | 48.42 | 36.67 | 31.13 | 46.97 | |||||||||||||
| 1957 | 33.45 | 44.86 | 42.61 | 47.31 | a | 52.23 | 60.50 | 64.33 | p | 59.68 | 57.14 | a | 49.21 | b | 38.32 | b | 35.72 | b | 47.37 | |||||||
| 1958 | 34.38 | b | 43.21 | 40.00 | 45.54 | b | 54.00 | 57.20 | 64.19 | 67.87 | a | 57.17 | a | 51.87 | 38.97 | a | 35.73 | a | 49.18 | |||||||
| 1959 | 39.39 | 36.75 | 40.42 | 47.74 | c | 48.40 | a | 58.86 | a | 65.48 | 60.55 | 55.52 | c | 49.03 | a | 35.96 | b | 32.58 | 47.56 | |||||||
| 1960 | 33.71 | 38.28 | 42.90 | a | 44.17 | 48.68 | 62.20 | 65.68 | 60.71 | 56.83 | 45.97 | 38.93 | 33.61 | 47.64 | ||||||||||||
| 1961 | 31.39 | 39.11 | 39.71 | 44.63 | 49.81 | 62.07 | 66.77 | 66.74 | 54.27 | 47.16 | 37.90 | 35.65 | 47.93 | |||||||||||||
| 1962 | 29.39 | 39.04 | 38.13 | 44.83 | 48.03 | 57.27 | 62.65 | 60.90 | 56.37 | 47.13 | 40.27 | 36.26 | 46.69 | |||||||||||||
| 1963 | 29.84 | 44.82 | 38.81 | 42.70 | 52.97 | 57.00 | d | 61.29 | 61.39 | 60.53 | 52.19 | 42.17 | 32.81 | 48.04 | ||||||||||||
| 1964 | 33.84 | 34.52 | 38.61 | 43.83 | 48.84 | 57.40 | 64.26 | 62.90 | 54.33 | 51.58 | 40.33 | 41.19 | 47.64 | |||||||||||||
| 1965 | 39.35 | 38.57 | 42.65 | 48.90 | 52.03 | 55.67 | 63.87 | 65.39 | 53.93 | 50.03 | 45.63 | 33.55 | 49.13 | |||||||||||||
| 1966 | 32.55 | 34.75 | 39.74 | 46.23 | 53.55 | 58.80 | 60.39 | 64.42 | 64.57 | 49.32 | 43.00 | 38.00 | 48.78 | |||||||||||||
| 1967 | 33.94 | 36.54 | 40.61 | 38.93 | 50.84 | 57.20 | 67.32 | 66.90 | 61.00 | 52.06 | 45.30 | 31.52 | 48.51 | |||||||||||||
| 1968 | 32.87 | 45.17 | 41.87 | 45.27 | 49.19 | 59.60 | 64.45 | 58.68 | ----- | z | 47.87 | 40.97 | 33.10 | 47.19 | ||||||||||||
| 1969 | 39.35 | 38.86 | 39.10 | 43.57 | 53.71 | 57.57 | 64.71 | 62.39 | 59.37 | 45.61 | 39.20 | 33.61 | 48.09 | |||||||||||||
| 1970 | 40.29 | 40.29 | 41.71 | 41.17 | 51.23 | 58.20 | 64.77 | 61.55 | 53.83 | 44.97 | 42.40 | 37.97 | 48.20 | |||||||||||||
| 1971 | 34.23 | 37.29 | 38.55 | 45.27 | 50.23 | 57.27 | 64.84 | 65.74 | 57.57 | 45.19 | 37.03 | a | 31.35 | 47.05 | ||||||||||||
| 1972 | 30.74 | 38.31 | 44.58 | 47.30 | 54.58 | 61.93 | 64.84 | 63.58 | ----- | z | ----- | z | 38.30 | 32.87 | 47.70 | |||||||||||
| 1973 | 36.81 | 42.75 | 39.52 | 44.17 | 55.61 | 60.90 | 63.00 | ----- | z | ----- | z | 45.58 | 40.70 | 36.39 | 46.54 | |||||||||||
| 1974 | 36.23 | 35.61 | 42.97 | 42.77 | 51.94 | 60.40 | 64.94 | 62.68 | 59.83 | 52.26 | 38.23 | 36.48 | 48.69 | |||||||||||||
| 1975 | 30.19 | 39.18 | 40.94 | 39.23 | 50.42 | 57.77 | 61.48 | 59.70 | d | 56.58 | k | 45.87 | 33.73 | 30.23 | 44.43 | |||||||||||
| 1976 | 30.33 | a | 39.03 | 39.03 | 44.47 | 53.97 | 57.41 | a | 64.81 | 59.65 | 59.67 | 50.35 | 42.83 | 30.42 | g | 49.23 | ||||||||||
| 1977 | 35.61 | 38.00 | 35.81 | 45.27 | 47.26 | 61.43 | 63.06 | 63.94 | 57.03 | 49.26 | 39.67 | 39.71 | c | 48.00 | ||||||||||||
| 1978 | ----- | z | 41.21 | 45.29 | 42.43 | 49.00 | 55.20 | 63.13 | 62.68 | c | 53.57 | b | 49.36 | c | 36.57 | 30.55 | 48.09 | |||||||||
| 1979 | 36.39 | 35.96 | 43.43 | a | ----- | z | 49.29 | c | 56.54 | d | 63.97 | 60.62 | b | 58.79 | a | 52.35 | 39.33 | ----- | z | 49.67 | ||||||
| 1980 | 41.13 | 43.48 | 40.48 | 46.30 | 49.94 | 53.60 | 63.93 | c | 61.29 | ----- | z | 48.42 | 39.27 | 33.93 | a | 47.43 | ||||||||||
| 1981 | 39.32 | 39.57 | 42.00 | 45.69 | a | 52.73 | a | 62.87 | 62.39 | 62.10 | 59.40 | 45.77 | 45.03 | 39.90 | 49.73 | |||||||||||
| 1982 | 33.39 | 39.50 | 42.55 | 45.10 | 52.87 | 57.30 | ----- | z | 62.65 | 58.43 | 50.06 | 40.93 | 36.39 | 47.20 | ||||||||||||
| 1983 | 35.90 | 41.29 | 43.87 | 43.47 | 51.70 | a | 58.17 | 58.74 | 64.61 | 61.33 | 51.71 | 43.30 | 41.84 | 49.66 | ||||||||||||
| 1984 | 37.19 | 36.72 | 43.26 | 43.93 | 54.97 | 58.47 | 70.39 | 66.77 | 64.20 | 48.77 | 41.53 | 38.00 | 50.35 | |||||||||||||
| 1985 | 34.68 | 36.50 | 38.13 | 49.00 | 50.94 | 62.60 | 68.06 | 62.26 | 56.43 | 47.61 | 41.43 | 33.10 | 48.40 | |||||||||||||
| 1986 | 43.61 | 44.04 | 46.06 | 46.63 | 54.06 | 61.67 | 65.87 | 66.65 | 55.17 | 49.19 | 41.47 | 36.52 | 50.91 | |||||||||||||
| 1987 | 34.61 | 39.18 | 42.74 | 50.17 | 55.81 | 62.20 | 61.48 | 62.77 | 58.80 | 56.13 | 41.73 | 36.71 | 50.19 | |||||||||||||
| 1988 | 37.19 | 38.17 | 42.29 | 47.43 | 51.61 | 59.60 | 69.45 | 65.13 | 58.77 | 52.58 | 42.70 | 34.32 | 49.94 | |||||||||||||
| 1989 | 31.48 | 37.89 | 46.65 | 51.27 | 53.77 | 61.10 | 65.94 | 63.06 | 57.83 | 50.13 | 39.87 | 31.00 | 49.17 | |||||||||||||
| 1990 | 35.94 | 36.39 | 44.94 | 51.50 | 53.81 | 60.10 | 68.55 | 65.97 | 60.57 | 52.19 | 40.27 | 28.58 | 49.90 | |||||||||||||
| 1991 | 36.87 | 42.36 | 42.61 | 46.03 | 50.58 | ----- | z | 68.10 | 63.35 | 63.47 | 55.55 | ----- | z | 34.65 | 50.36 | |||||||||||
| 1992 | 35.52 | 45.14 | 46.87 | 49.43 | ----- | z | 62.37 | ----- | z | 67.03 | 60.00 | 54.84 | 41.23 | 35.00 | 49.74 | |||||||||||
| 1993 | 38.26 | 41.79 | 47.32 | 46.90 | 54.29 | 59.27 | 63.68 | 63.48 | ----- | z | 53.03 | 39.60 | 35.71 | 49.39 | ||||||||||||
| 1994 | 35.48 | 39.07 | 44.77 | 48.83 | 54.39 | 60.87 | 66.87 | 65.45 | 59.43 | 49.39 | 38.03 | 35.45 | 49.84 | |||||||||||||
| 1995 | 44.71 | 45.46 | 45.74 | 46.37 | 53.06 | 58.13 | 64.84 | 64.13 | 59.10 | 50.23 | 46.17 | 40.29 | 51.52 | |||||||||||||
| 1996 | 39.00 | 45.62 | 43.94 | 47.73 | 54.65 | 61.30 | 68.32 | 65.06 | 57.37 | 49.52 | 42.70 | 40.29 | 51.29 | |||||||||||||
| 1997 | 42.00 | 39.29 | 44.61 | 48.10 | 58.48 | 60.70 | 65.81 | 65.23 | 62.10 | 48.55 | 45.67 | 35.10 | 51.30 | |||||||||||||
| 1998 | 40.45 | 41.71 | 43.35 | 44.97 | 49.29 | 58.17 | 66.35 | 67.32 | 61.83 | 46.55 | 41.03 | 30.23 | 49.27 | |||||||||||||
| 1999 | 34.32 | 38.00 | 41.13 | 46.23 | 51.71 | 59.33 | 65.13 | 63.17 | a | 60.70 | 51.71 | 43.17 | 33.35 | 49.00 | ||||||||||||
| 2000 | 41.48 | 44.07 | 42.63 | a | 49.90 | 55.81 | 64.23 | 62.16 | 65.90 | 59.07 | 50.90 | 37.07 | 36.48 | 50.81 | ||||||||||||
| 2001 | 33.65 | 39.61 | 45.97 | 44.13 | 59.35 | 63.33 | 67.52 | 65.00 | 60.93 | 53.94 | 44.00 | 38.74 | 51.35 | |||||||||||||
| 2002 | 35.52 | 37.61 | 41.58 | ----- | z | 53.45 | 63.27 | 68.97 | 63.52 | 60.93 | 49.29 | 41.83 | 39.68 | 50.51 | ||||||||||||
| 2003 | 40.55 | 39.50 | 44.03 | 45.60 | 54.16 | 61.87 | 70.42 | ----- | z | 62.80 | 52.81 | 40.20 | 41.19 | 50.28 | ||||||||||||
| 2004 | 38.10 | 39.93 | 46.97 | ----- | z | 54.84 | 61.53 | 67.90 | 65.32 | 58.00 | 51.26 | 40.48 | i | 38.38 | g | 53.76 | ||||||||||
| 2005 | 40.55 | 43.63 | i | 44.16 | 44.30 | 53.39 | 57.13 | g | 69.81 | 66.32 | 55.23 | 49.61 | 43.72 | l | 41.77 | 51.68 | ||||||||||
| 2006 | 36.81 | ----- | z | ----- | z | 48.53 | ----- | z | 65.15 | q | 71.29 | 63.23 | 59.71 | m | 48.70 | k | 43.09 | s | 34.95 | i | 54.96 | |||||
| 2007 | 30.10 | 40.68 | 46.21 | q | 48.19 | n | 58.00 | j | 61.77 | 67.32 | 66.94 | 58.73 | 48.90 | 42.33 | 34.13 | 50.10 | ||||||||||
| 2008 | 37.58 | 38.31 | 41.97 | 44.00 | 56.13 | 61.33 | 71.04 | e | 68.87 | 60.43 | 50.00 | 44.00 | 34.48 | 50.68 | ||||||||||||
| 2009 | 35.81 | 39.96 | 41.65 | 47.03 | 59.32 | 61.50 | 69.03 | 64.81 | 63.00 | 50.00 | 39.83 | 36.84 | 50.73 | |||||||||||||
| 2010 | 40.03 | 41.86 | 40.35 | 45.70 | g | 49.75 | k | 62.17 | 68.81 | e | 63.58 | 59.17 | 54.58 | 39.47 | 42.16 | 51.22 | ||||||||||
| 2011 | 37.50 | a | 36.22 | j | 44.62 | b | 46.22 | c | 50.43 | c | 58.40 | 66.31 | b | 64.65 | 63.82 | b | 52.17 | a | 40.33 | 31.55 | 50.55 | |||||
| 2012 | 36.06 | 38.44 | b | 42.24 | b | 46.27 | s | 56.90 | 61.96 | b | 67.20 | a | 69.39 | h | 65.45 | j | 16.59 | d | 0.00 | p | ----- | z | 45.63 | |||
| 2013 | ----- | z | 26.42 | i | 45.58 | 55.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.58 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.84 | 39.18 | 41.84 | 45.90 | 52.51 | 59.21 | 65.29 | 63.23 | 58.60 | 49.25 | 40.58 | 35.74 | 48.88 | |||||||||||||
| S.D. | 3.75 | 3.09 | 2.71 | 2.58 | 2.80 | 2.61 | 2.82 | 2.55 | 2.70 | 4.79 | 2.65 | 3.44 | 1.42 | |||||||||||||
| SKEW | -0.02 | 0.38 | 0.09 | -0.37 | 0.12 | -0.29 | 0.07 | 0.00 | 0.08 | -4.59 | 0.16 | 0.31 | 0.17 | |||||||||||||
| MAX | 44.71 | 45.62 | 47.32 | 51.50 | 59.35 | 64.23 | 71.29 | 68.87 | 64.57 | 56.13 | 46.47 | 43.42 | 51.52 | |||||||||||||
| MIN | 26.61 | 33.17 | 35.81 | 38.93 | 46.00 | 52.83 | 58.74 | 58.16 | 53.57 | 16.59 | 33.73 | 28.58 | 46.11 | |||||||||||||
| NO YRS | 69 | 67 | 70 | 65 | 67 | 67 | 68 | 68 | 63 | 69 | 66 | 66 | 47 | |||||||||||||