| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1952 | ----- | z | 31.85 | s | 39.64 | b | 49.77 | 54.29 | 58.27 | 67.56 | 65.87 | 62.55 | 53.90 | 31.43 | 32.45 | 51.57 | ||||||||||
| 1953 | 41.96 | c | 38.09 | 40.77 | 43.75 | 50.15 | 53.75 | 65.26 | 64.10 | 61.60 | 49.53 | 43.48 | 37.68 | 49.18 | ||||||||||||
| 1954 | 33.68 | 39.88 | 37.28 | b | 46.50 | 53.65 | 56.28 | 63.87 | a | 60.47 | 55.98 | 45.71 | 42.87 | 30.82 | a | 47.25 | ||||||||||
| 1955 | 30.56 | 34.00 | 36.39 | 41.15 | 50.39 | 59.97 | 62.42 | a | 64.85 | 58.72 | 49.27 | 36.50 | 33.58 | 46.48 | ||||||||||||
| 1956 | 33.84 | 31.60 | 42.73 | a | 50.38 | 56.52 | 58.60 | 67.76 | 64.69 | 60.28 | 47.42 | 36.55 | 35.76 | 48.84 | ||||||||||||
| 1957 | 18.77 | 36.89 | 40.58 | 47.73 | 55.61 | 61.52 | 63.52 | 61.60 | 60.88 | a | 46.27 | 37.13 | 38.16 | 47.39 | ||||||||||||
| 1958 | 36.47 | 43.48 | 38.87 | 45.67 | 57.52 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.12 | |||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.43 | 66.02 | 67.13 | 62.03 | 49.65 | 41.59 | b | 37.05 | a | 55.41 | ||||||
| 1975 | 36.72 | b | 33.79 | 37.89 | 40.08 | 51.08 | 57.40 | 68.52 | 62.95 | 60.02 | 48.31 | 39.08 | 36.66 | 47.71 | ||||||||||||
| 1976 | 35.08 | 34.66 | 37.68 | 42.60 | 52.89 | 55.77 | 66.23 | 63.15 | 60.75 | 49.30 | a | 41.13 | 32.89 | 47.68 | ||||||||||||
| 1977 | 27.11 | 37.48 | 38.55 | 49.22 | 48.31 | 63.72 | 65.56 | 70.71 | 56.07 | 48.47 | 37.23 | 35.10 | 48.13 | |||||||||||||
| 1978 | 32.90 | 38.41 | 43.55 | 44.83 | 49.53 | 60.67 | 66.60 | 64.50 | 55.30 | 49.94 | 30.33 | 30.03 | 47.22 | |||||||||||||
| 1979 | 15.48 | a | 34.61 | 42.66 | 44.98 | 54.39 | 61.25 | 67.13 | 64.66 | 62.03 | 51.23 | 35.20 | 38.29 | 47.66 | ||||||||||||
| 1980 | 27.89 | 35.60 | 39.52 | 47.52 | 52.82 | 56.23 | 66.85 | 62.56 | 59.65 | 49.16 | 40.48 | 37.60 | 47.99 | |||||||||||||
| 1981 | 33.55 | 35.45 | 41.21 | 46.02 | 51.58 | 57.80 | 63.94 | 69.29 | 59.75 | 47.29 | 41.30 | 35.06 | 48.52 | |||||||||||||
| 1982 | 30.56 | 35.02 | 39.60 | 42.55 | 51.35 | 61.57 | 65.18 | 65.79 | 56.25 | 46.37 | 34.80 | 33.26 | 46.86 | |||||||||||||
| 1983 | 37.34 | 39.73 | 43.65 | 44.50 | 54.34 | 57.43 | 61.35 | 67.40 | 55.40 | 49.05 | 42.15 | 23.13 | 47.96 | |||||||||||||
| 1984 | 33.11 | 37.17 | 42.92 | 43.32 | 50.50 | 56.27 | 67.03 | 66.73 | 56.33 | 45.79 | 38.28 | 30.23 | 47.31 | |||||||||||||
| 1985 | 27.68 | 33.41 | 39.03 | 50.18 | 53.98 | 61.83 | 72.26 | 64.48 | 53.20 | 47.65 | 27.60 | 20.89 | 46.02 | |||||||||||||
| 1986 | 35.24 | b | 36.46 | 45.77 | a | 44.82 | 53.98 | 66.35 | 63.16 | 70.79 | 54.55 | 50.35 | 41.36 | b | 32.29 | 49.59 | ||||||||||
| 1987 | 31.02 | 37.00 | 41.94 | 52.55 | 57.65 | 64.00 | 65.44 | 66.47 | 62.60 | 52.50 | 39.55 | 31.95 | a | 50.22 | ||||||||||||
| 1988 | 31.15 | 37.93 | 41.79 | 49.25 | 52.71 | 60.68 | 68.23 | 66.50 | 59.78 | 56.39 | 41.35 | 32.84 | 49.88 | |||||||||||||
| 1989 | 36.35 | 25.50 | 40.92 | 51.03 | 53.00 | 62.53 | 65.61 | 63.74 | 59.78 | 48.42 | 41.77 | 32.24 | 48.41 | |||||||||||||
| 1990 | 37.10 | 35.61 | 42.98 | 52.47 | 52.08 | 61.25 | 70.11 | 68.35 | 64.68 | 48.13 | 41.90 | 25.65 | 50.03 | |||||||||||||
| 1991 | 32.79 | 43.43 | 40.32 | 45.67 | 50.55 | 58.02 | 69.29 | 71.16 | 63.28 | 50.68 | 41.03 | 35.55 | 50.15 | |||||||||||||
| 1992 | 37.32 | 41.72 | 45.53 | 50.22 | 59.61 | 66.37 | 67.10 | 69.10 | 58.72 | 51.58 | 39.43 | 29.82 | 51.38 | |||||||||||||
| 1993 | 22.56 | 27.12 | 41.61 | 46.12 | 57.95 | 59.05 | 60.18 | 64.31 | 61.25 | 51.84 | 31.14 | a | 33.55 | 46.39 | ||||||||||||
| 1994 | 38.27 | 33.80 | 44.21 | 49.43 | 56.37 | 60.30 | 71.10 | 67.55 | 64.03 | 48.05 | 35.82 | 35.24 | 50.35 | |||||||||||||
| 1995 | 33.58 | 41.34 | 41.03 | 44.92 | 55.05 | 59.50 | 67.68 | 63.98 | 62.68 | 47.29 | 44.48 | 33.39 | 49.58 | |||||||||||||
| 1996 | 35.89 | 32.22 | 41.63 | 48.77 | 51.39 | 60.50 | 71.24 | 69.08 | 57.62 | 49.44 | 39.92 | 35.16 | 49.40 | |||||||||||||
| 1997 | 32.97 | 36.62 | 43.05 | 45.93 | 58.76 | 59.38 | 67.03 | 69.81 | 61.17 | 49.26 | 41.70 | 32.85 | 49.88 | |||||||||||||
| 1998 | 36.45 | 39.38 | 43.05 | 46.72 | 52.58 | 61.40 | 72.74 | 69.73 | 64.90 | 47.89 | 41.75 | 33.40 | 50.83 | |||||||||||||
| 1999 | 37.76 | 38.96 | 40.05 | 43.70 | 50.50 | 59.10 | 66.31 | 69.27 | 59.32 | 50.05 | 45.33 | 36.40 | 49.73 | |||||||||||||
| 2000 | 31.19 | 37.19 | 40.89 | 49.70 | 54.34 | 62.50 | 67.11 | 67.60 | 59.45 | 49.16 | 33.87 | 32.08 | 48.76 | |||||||||||||
| 2001 | 32.39 | 34.43 | 43.02 | 44.92 | 57.82 | 59.90 | 67.32 | 70.13 | 63.57 | 50.15 | 41.32 | 33.24 | 49.85 | |||||||||||||
| 2002 | 34.34 | 38.16 | 38.15 | 47.55 | 52.77 | 64.05 | 70.55 | 66.19 | 61.28 | 46.45 | 39.88 | 35.81 | 49.60 | |||||||||||||
| 2003 | 39.31 | 37.18 | 45.19 | 45.78 | 54.26 | 64.32 | 72.24 | 69.29 | 63.55 | 53.85 | 36.07 | 34.68 | 51.31 | |||||||||||||
| 2004 | 28.32 | 36.84 | 45.84 | 49.10 | 54.84 | 62.77 | 70.52 | 70.77 | 58.40 | 51.18 | 39.45 | 37.03 | 50.42 | |||||||||||||
| 2005 | 34.00 | 36.09 | 44.58 | 46.53 | 56.74 | 58.87 | 70.97 | 70.23 | 58.67 | 51.63 | e | 37.68 | 27.24 | 49.44 | ||||||||||||
| 2006 | 39.65 | 33.64 | 39.73 | 48.08 | 56.71 | 63.90 | 72.65 | 67.97 | 61.10 | 48.87 | 40.93 | 32.73 | 50.50 | |||||||||||||
| 2007 | 29.87 | 37.38 | 45.82 | 46.23 | 56.21 | 61.95 | 72.71 | 67.52 | 59.35 | 47.82 | 38.73 | 34.53 | 49.84 | |||||||||||||
| 2008 | 30.89 | 38.71 | 39.81 | 42.80 | 54.52 | 59.40 | 69.58 | 68.74 | 60.58 | 49.68 | 44.33 | j | 29.55 | k | 51.47 | |||||||||||
| 2009 | 33.13 | 35.12 | p | 37.61 | i | 46.66 | h | 52.28 | k | 62.88 | 70.21 | x | ----- | z | ----- | z | 47.50 | p | 39.80 | e | 27.81 | 40.90 | ||||
| 2010 | 38.53 | 38.29 | 40.27 | 43.10 | 49.23 | 56.38 | 66.74 | 65.15 | 59.38 | 50.55 | 38.40 | 32.82 | 48.24 | |||||||||||||
| 2011 | 36.42 | e | 33.35 | e | 40.92 | f | 41.46 | e | 48.42 | e | 57.33 | c | 63.38 | e | 69.12 | g | 63.98 | d | 50.10 | j | 39.39 | h | 32.70 | k | 49.19 | |
| 2012 | 34.62 | n | 36.61 | o | 40.16 | o | 50.08 | r | 53.17 | k | 56.65 | m | 68.27 | e | 69.00 | l | 61.59 | g | 48.94 | f | 40.68 | e | 33.02 | h | 54.47 | |
| 2013 | 28.12 | j | 36.78 | j | 41.26 | f | 51.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.00 | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 33.00 | 36.37 | 41.42 | 46.46 | 53.56 | 60.35 | 67.37 | 66.77 | 60.01 | 49.42 | 38.85 | 33.02 | 48.87 | |||||||||||||
| S.D. | 5.23 | 3.57 | 2.49 | 3.06 | 2.87 | 2.94 | 3.14 | 2.78 | 2.87 | 2.25 | 3.83 | 3.81 | 1.42 | |||||||||||||
| SKEW | -1.33 | -0.67 | 0.09 | 0.04 | 0.11 | 0.03 | -0.07 | -0.24 | -0.39 | 0.78 | -1.01 | -1.24 | -0.22 | |||||||||||||
| MAX | 41.96 | 43.48 | 45.84 | 52.55 | 59.61 | 66.37 | 72.74 | 71.16 | 64.90 | 56.39 | 45.33 | 38.29 | 51.38 | |||||||||||||
| MIN | 15.48 | 25.50 | 36.39 | 40.08 | 48.31 | 53.75 | 60.18 | 60.47 | 53.20 | 45.71 | 27.60 | 20.89 | 46.02 | |||||||||||||
| NO YRS | 43 | 42 | 42 | 43 | 42 | 44 | 44 | 42 | 43 | 42 | 43 | 42 | 39 | |||||||||||||