| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.02 | g | 43.65 | 33.84 | 38.74 | |||
| 1960 | 29.36 | b | 32.52 | g | 41.64 | i | 40.48 | f | 47.27 | 64.05 | a | 72.05 | b | 66.29 | 63.48 | 51.35 | 36.60 | a | 33.58 | f | 53.81 | |||||
| 1961 | 37.97 | 36.43 | f | 37.05 | a | 43.82 | 49.77 | c | 64.48 | 69.27 | 69.94 | 56.62 | b | 49.58 | 37.86 | a | 31.00 | 49.76 | ||||||||
| 1962 | 28.29 | 32.93 | a | 35.32 | 48.82 | 47.55 | 58.53 | a | 66.50 | 64.50 | 63.08 | 49.50 | 42.18 | 36.80 | a | 47.83 | ||||||||||
| 1963 | 32.68 | a | 42.32 | 36.10 | b | 37.40 | 53.18 | 55.97 | 61.84 | 64.35 | 62.67 | 50.73 | 39.02 | 35.76 | 47.67 | |||||||||||
| 1964 | ----- | z | ----- | z | 34.15 | 41.07 | b | 47.84 | 54.92 | 65.79 | c | 64.43 | a | 57.00 | 54.42 | 35.69 | a | 32.65 | 48.79 | |||||||
| 1965 | 32.21 | 35.63 | b | 40.37 | a | 44.20 | 49.31 | 57.10 | 63.50 | 62.02 | 55.60 | 56.05 | 39.64 | a | 30.65 | a | 47.19 | |||||||||
| 1966 | 30.82 | 31.32 | 37.68 | 46.95 | 55.82 | 56.52 | a | 63.30 | a | 66.66 | b | 60.24 | a | 50.60 | 38.32 | 33.16 | 47.62 | |||||||||
| 1967 | 31.95 | b | 37.54 | 35.26 | 34.23 | 52.05 | 58.58 | 69.48 | 72.00 | 63.47 | 48.88 | a | 41.76 | a | 27.56 | 47.73 | ||||||||||
| 1968 | 29.08 | 38.74 | 40.71 | 42.98 | 50.11 | 60.03 | 70.47 | 61.32 | 59.82 | 48.10 | 37.62 | 28.16 | 47.26 | |||||||||||||
| 1969 | 27.95 | 29.75 | 36.26 | 43.10 | 55.24 | 58.92 | 66.77 | 66.40 | 61.50 | 43.50 | 40.77 | 33.63 | 46.98 | |||||||||||||
| 1970 | 32.35 | 38.20 | 37.58 | 38.22 | 52.68 | 61.40 | a | 68.84 | 68.11 | 55.84 | a | 48.30 | c | 40.00 | 27.00 | a | 47.38 | |||||||||
| 1971 | 32.16 | 34.84 | 34.27 | 41.83 | 49.45 | 54.90 | 67.81 | 70.15 | 55.78 | 44.13 | 37.50 | a | 26.06 | 45.74 | ||||||||||||
| 1972 | 26.92 | 35.03 | 43.89 | 40.77 | 53.58 | 61.08 | 68.77 | 67.31 | 55.73 | 47.85 | 34.90 | 26.08 | 46.83 | |||||||||||||
| 1973 | 27.71 | 34.46 | 35.68 | 45.42 | 56.26 | 60.98 | 68.20 | c | 66.60 | 58.84 | b | 48.25 | c | ----- | z | ----- | z | 50.24 | ||||||||
| 1974 | 26.02 | 31.05 | 35.53 | 40.68 | ----- | z | ----- | z | 65.26 | 66.95 | 64.13 | 50.81 | d | 38.65 | c | 31.53 | a | 45.06 | ||||||||
| 1975 | 30.05 | c | 30.12 | b | 33.16 | b | 34.66 | e | 52.06 | d | 57.82 | e | 66.57 | c | 62.82 | 64.72 | 46.37 | 35.32 | 34.48 | a | 45.68 | |||||
| 1976 | 33.81 | 34.48 | 34.20 | a | 40.17 | c | 53.84 | 55.57 | a | 67.31 | 59.95 | 61.36 | a | 52.33 | b | 45.08 | 35.31 | 47.78 | ||||||||
| 1977 | 26.40 | 37.75 | 33.35 | 47.73 | 43.27 | 63.97 | ----- | z | 70.22 | a | 57.58 | 50.23 | a | 38.40 | 34.71 | 45.78 | ||||||||||
| 1978 | 35.02 | 36.50 | 43.94 | 40.73 | ----- | z | ----- | z | ----- | z | ----- | z | 55.09 | h | ----- | z | ----- | z | ----- | z | 39.05 | |||||
| 1979 | ----- | z | ----- | z | 40.61 | 42.96 | g | ----- | z | ----- | z | ----- | z | ----- | z | 62.63 | c | ----- | z | 37.10 | 35.10 | a | 43.86 | |||
| 1980 | ----- | z | 38.52 | e | 36.06 | 44.65 | c | 50.45 | 53.73 | d | 67.30 | c | 65.53 | l | 60.12 | e | 52.05 | c | 40.32 | h | 35.50 | c | 48.71 | |||
| 1981 | 36.41 | c | 35.89 | a | 38.98 | h | 45.58 | f | 50.72 | a | 59.23 | 66.47 | 69.92 | 61.35 | 46.37 | 39.52 | b | 34.93 | c | 50.08 | ||||||
| 1982 | 28.02 | 32.96 | 35.31 | 39.32 | 51.73 | 58.13 | 64.84 | ----- | z | 55.37 | 46.40 | k | 35.53 | j | 29.55 | 43.91 | ||||||||||
| 1983 | 34.71 | 36.11 | 38.16 | 39.57 | i | 52.82 | 56.75 | j | 64.24 | f | 67.22 | f | 59.39 | g | 52.78 | d | 36.70 | 31.00 | 40.33 | |||||||
| 1984 | 33.56 | 35.72 | 41.34 | 43.35 | 53.48 | a | 58.10 | 69.59 | h | 67.97 | 60.76 | a | 44.35 | 35.03 | 28.40 | a | 45.64 | |||||||||
| 1985 | 30.02 | 32.50 | 35.65 | 49.93 | 50.73 | 63.68 | 70.84 | 65.23 | 53.10 | 47.71 | 30.87 | 32.52 | 46.90 | |||||||||||||
| 1986 | 38.90 | 38.75 | 44.42 | 44.28 | 51.97 | 64.92 | 65.76 | 72.24 | 53.88 | ----- | z | 40.27 | 32.21 | 49.78 | ||||||||||||
| 1987 | 28.94 | 36.95 | 38.37 | 50.88 | 55.82 | ----- | z | 61.76 | 68.24 | 63.47 | 57.90 | 39.28 | 29.61 | 48.29 | ||||||||||||
| 1988 | 29.32 | 38.45 | 39.76 | 46.67 | a | 48.87 | 60.85 | 71.26 | 70.19 | 61.93 | ----- | z | 37.70 | 30.89 | 48.72 | |||||||||||
| 1989 | 27.18 | 26.27 | 38.71 | 49.12 | 48.42 | 61.72 | 66.19 | 63.48 | 59.27 | 47.44 | 41.45 | 36.63 | 47.16 | |||||||||||||
| 1990 | 33.35 | 31.27 | 40.69 | 50.25 | 48.76 | 57.48 | 68.00 | 66.34 | 61.95 | 50.16 | 36.85 | 24.65 | a | 47.48 | ||||||||||||
| 1991 | 34.16 | 43.09 | 33.85 | 42.33 | 47.97 | n | 54.40 | 69.53 | 68.16 | 65.87 | 54.56 | 41.97 | 32.77 | 49.15 | ||||||||||||
| 1992 | 34.11 | 40.21 | 43.50 | 49.42 | 60.66 | 63.15 | 66.73 | 71.34 | 61.92 | 53.87 | 37.75 | 27.40 | a | 50.84 | ||||||||||||
| 1993 | 26.00 | 29.32 | 42.52 | 42.48 | 53.23 | 53.60 | 61.06 | 63.40 | 61.15 | 52.18 | l | 36.32 | 31.79 | 45.53 | ||||||||||||
| 1994 | 35.39 | 32.34 | 42.53 | 46.68 | 53.85 | 59.58 | 72.44 | 67.69 | 62.25 | 48.27 | 30.25 | 30.24 | 48.46 | |||||||||||||
| 1995 | 34.24 | 43.54 | 36.95 | 42.28 | 51.37 | 56.30 | 65.15 | 64.94 | 63.02 | 50.13 | 44.93 | 35.11 | 49.00 | |||||||||||||
| 1996 | 34.24 | 35.84 | 40.92 | 44.18 | 49.34 | 59.45 | 70.29 | 68.79 | 57.15 | 49.95 | 39.83 | 33.32 | 48.61 | |||||||||||||
| 1997 | 31.13 | 34.09 | 41.65 | 42.62 | 56.45 | 56.97 | 65.58 | 66.34 | 58.75 | 46.95 | 38.23 | 27.02 | 47.15 | |||||||||||||
| 1998 | 34.81 | 32.77 | 39.27 | 43.27 | 45.37 | 58.12 | 70.21 | 70.58 | 64.03 | 49.66 | 38.22 | 28.03 | 47.86 | |||||||||||||
| 1999 | 34.02 | c | 30.72 | c | 36.98 | c | 40.85 | c | 50.47 | b | 58.04 | d | 66.50 | a | 65.74 | 61.37 | 53.03 | 43.94 | e | 33.44 | f | 49.24 | ||||
| 2000 | 32.75 | c | 36.77 | a | 39.08 | 47.63 | 52.55 | 63.53 | 66.10 | 68.87 | 58.13 | 49.32 | 35.08 | 34.73 | 48.71 | |||||||||||
| 2001 | 33.03 | a | 32.66 | 42.40 | 42.07 | 58.94 | 59.50 | b | 68.15 | 70.58 | 62.92 | 53.45 | 39.37 | 31.06 | 49.51 | |||||||||||
| 2002 | 30.60 | 37.05 | 37.65 | 46.80 | 51.08 | 61.93 | 72.48 | 66.55 | 61.97 | 49.27 | 40.62 | 34.90 | 49.24 | |||||||||||||
| 2003 | 39.42 | 34.54 | a | 41.11 | 38.65 | 51.98 | 64.82 | 72.68 | 68.10 | 65.12 | 55.37 | 35.15 | 33.68 | 50.05 | ||||||||||||
| 2004 | 33.26 | 34.10 | 46.69 | 47.28 | 52.74 | 61.65 | 69.85 | 68.44 | 59.22 | 48.11 | 37.55 | 34.90 | 49.48 | |||||||||||||
| 2005 | 32.32 | 36.86 | 41.63 | 42.95 | 51.81 | 54.70 | 72.23 | 70.08 | 58.45 | 49.16 | 37.48 | 33.27 | 48.41 | |||||||||||||
| 2006 | 32.94 | 33.93 | 32.15 | 42.80 | 54.40 | 63.02 | 70.27 | 65.15 | 61.15 | 48.50 | 37.93 | 31.87 | 47.84 | |||||||||||||
| 2007 | 29.03 | 35.21 | 43.62 | c | 45.58 | 54.84 | 60.52 | 70.31 | 67.71 | 58.08 | ----- | z | 39.40 | 28.64 | f | 50.43 | ||||||||||
| 2008 | 26.13 | d | 34.12 | 38.40 | 41.83 | 52.77 | 59.72 | 69.69 | 69.10 | 63.25 | 51.37 | 40.18 | s | 31.48 | 48.90 | |||||||||||
| 2009 | 33.07 | h | 35.21 | 36.02 | e | 44.50 | h | 54.50 | k | 59.69 | i | 71.44 | n | 70.73 | r | 64.57 | 44.97 | p | 37.87 | 28.32 | 40.40 | |||||
| 2010 | 35.11 | l | 35.68 | 37.75 | k | 38.52 | 44.98 | 58.48 | 66.59 | t | 66.21 | c | 60.37 | 52.31 | 35.07 | p | 34.08 | 48.83 | ||||||||
| 2011 | 33.18 | 31.82 | 34.87 | 40.07 | b | 46.10 | 56.25 | 65.98 | 68.95 | 65.45 | 50.39 | 37.05 | 30.86 | q | 48.19 | |||||||||||
| 2012 | 33.64 | c | 34.14 | 34.91 | n | 42.71 | m | 52.65 | n | 58.14 | i | 67.93 | k | 71.38 | k | 65.09 | s | 49.84 | o | 39.60 | 29.20 | f | 35.79 | |||
| 2013 | 29.91 | h | 32.00 | v | 43.73 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.78 | 35.06 | 38.48 | 43.39 | 51.62 | 59.27 | 67.76 | 67.18 | 60.51 | 50.08 | 38.46 | 31.77 | 47.94 | |||||||||||||
| S.D. | 3.37 | 3.49 | 3.52 | 3.92 | 3.49 | 3.18 | 2.96 | 2.83 | 3.19 | 3.11 | 3.01 | 3.15 | 1.19 | |||||||||||||
| SKEW | 0.07 | 0.20 | 0.27 | -0.10 | 0.02 | 0.09 | -0.29 | -0.43 | -0.44 | 0.23 | -0.14 | -0.44 | 0.43 | |||||||||||||
| MAX | 39.42 | 43.54 | 46.69 | 50.88 | 60.66 | 64.92 | 72.68 | 72.24 | 65.87 | 57.90 | 45.08 | 36.80 | 50.84 | |||||||||||||
| MIN | 26.00 | 26.27 | 32.15 | 34.23 | 43.27 | 53.60 | 61.06 | 59.95 | 53.10 | 43.50 | 30.25 | 24.65 | 45.68 | |||||||||||||
| NO YRS | 48 | 49 | 49 | 47 | 47 | 46 | 45 | 46 | 50 | 44 | 48 | 47 | 28 | |||||||||||||