| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.05 | t | 34.02 | 34.02 | ||
| 1956 | 32.89 | 28.50 | 40.95 | 46.18 | 55.58 | 60.70 | 67.81 | 66.24 | 61.29 | d | 46.63 | 35.62 | 30.61 | 47.75 | ||||||||||||
| 1957 | 20.11 | 35.75 | 39.84 | 43.45 | a | 51.70 | a | 60.70 | 67.02 | 66.65 | 59.58 | 44.84 | 34.97 | 34.81 | 46.62 | |||||||||||
| 1958 | 31.32 | 40.82 | 35.40 | 43.95 | 60.56 | 61.90 | a | 68.77 | 72.82 | 61.37 | 52.76 | 39.95 | 38.25 | a | 50.66 | |||||||||||
| 1959 | 35.00 | 32.71 | 38.91 | c | 49.38 | 49.11 | 65.02 | 72.08 | 67.06 | 58.02 | b | 52.76 | 40.70 | 28.79 | 49.13 | |||||||||||
| 1960 | 25.35 | 31.79 | 43.66 | 47.07 | 51.08 | 64.72 | 73.94 | 66.08 | 61.88 | 50.32 | 38.07 | 30.23 | 48.68 | |||||||||||||
| 1961 | 32.87 | 38.32 | 39.48 | 44.85 | 53.80 | d | 67.98 | 72.03 | 73.05 | 54.48 | 47.98 | 36.40 | 28.40 | 49.14 | ||||||||||||
| 1962 | 21.58 | 31.30 | 35.35 | a | 49.25 | 50.48 | 60.73 | 66.29 | 66.24 | 60.22 | 48.52 | 38.65 | 32.90 | 46.79 | ||||||||||||
| 1963 | 25.87 | 40.62 | 35.66 | 40.58 | 55.27 | 58.05 | 65.61 | 67.24 | 63.38 | 53.90 | 39.08 | 29.52 | 47.90 | |||||||||||||
| 1964 | 29.24 | 32.21 | 35.60 | a | 42.38 | 51.45 | 58.72 | 69.97 | 65.83 | b | 57.78 | 52.52 | 37.05 | 33.56 | 47.19 | |||||||||||
| 1965 | 31.29 | 36.67 | a | 35.42 | 47.12 | 49.52 | 59.38 | 68.31 | 64.56 | 52.65 | 53.26 | 40.15 | 29.24 | 47.30 | ||||||||||||
| 1966 | 29.63 | 32.80 | r | 40.42 | 47.05 | 59.87 | 60.78 | 70.05 | 69.73 | a | 63.78 | 49.95 | 42.18 | 31.87 | 51.39 | |||||||||||
| 1967 | 34.73 | 38.77 | 39.63 | 38.93 | c | 53.85 | 60.43 | 73.90 | 73.71 | 64.93 | 51.26 | 40.68 | 28.61 | 49.95 | ||||||||||||
| 1968 | 30.13 | 38.93 | 42.77 | 41.72 | 52.40 | 61.63 | 71.81 | 62.44 | 59.75 | 49.58 | 38.32 | 30.11 | 48.30 | |||||||||||||
| 1969 | 32.52 | 32.27 | 37.81 | 47.48 | 55.66 | 61.52 | 70.16 | 69.34 | 62.22 | 45.05 | a | 38.68 | 34.66 | 48.95 | ||||||||||||
| 1970 | 34.26 | 38.77 | 37.08 | 38.98 | 52.84 | 63.13 | 70.26 | 71.27 | 55.85 | 46.26 | 40.15 | 27.87 | 48.06 | |||||||||||||
| 1971 | 34.24 | 35.68 | 36.89 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.80 | e | 25.76 | f | 35.90 | ||||
| 1972 | 28.38 | b | 35.84 | 43.28 | a | 42.52 | 56.31 | 63.95 | 69.74 | 67.29 | 54.13 | 48.32 | 37.45 | ----- | z | 49.75 | ||||||||||
| 1973 | 27.85 | 35.70 | 36.65 | 41.75 | 57.27 | 64.57 | 72.42 | 68.74 | 58.87 | 49.47 | 39.08 | 35.71 | 49.01 | |||||||||||||
| 1974 | 28.31 | 34.95 | 40.02 | 44.87 | 53.73 | c | 68.14 | a | ----- | z | 67.45 | 61.43 | 47.44 | 39.03 | 29.69 | 46.82 | ||||||||||
| 1975 | 29.08 | 31.55 | 36.19 | 36.67 | 51.18 | a | 58.25 | 71.29 | ----- | z | ----- | z | ----- | z | 36.90 | 36.39 | 43.06 | |||||||||
| 1976 | 32.90 | 36.36 | 34.79 | 43.43 | 55.82 | 60.77 | 71.19 | 64.29 | 60.47 | 48.47 | 42.82 | 31.21 | 48.54 | |||||||||||||
| 1977 | 20.53 | 36.36 | 35.35 | 49.38 | 48.34 | 66.52 | 69.24 | 69.15 | 59.90 | 50.85 | 37.63 | 36.48 | 48.31 | |||||||||||||
| 1978 | 34.87 | 36.86 | 44.66 | 44.22 | 49.71 | 61.09 | a | 69.95 | 66.23 | 56.95 | 51.21 | 35.27 | 26.19 | 48.10 | ||||||||||||
| 1979 | 20.34 | 33.04 | 43.31 | 44.87 | 54.73 | 62.63 | 71.56 | 67.48 | 63.35 | 52.74 | 32.45 | 34.94 | 48.45 | |||||||||||||
| 1980 | 29.60 | 37.98 | 36.50 | 48.62 | 54.34 | 58.50 | 70.74 | 65.48 | 60.52 | 49.79 | 38.85 | 34.23 | 48.76 | |||||||||||||
| 1981 | 30.19 | 35.14 | 39.76 | 48.29 | a | 51.93 | d | 61.67 | 69.47 | 71.85 | 61.42 | 46.03 | b | 41.47 | 36.53 | 49.48 | ||||||||||
| 1982 | 29.90 | a | 32.07 | 38.79 | 42.23 | 52.66 | 61.22 | 68.47 | 70.11 | 58.17 | 48.05 | 31.28 | 28.97 | 46.83 | ||||||||||||
| 1983 | 34.37 | 37.25 | 39.71 | 41.27 | 52.73 | 59.82 | 66.68 | 70.31 | 60.05 | a | 51.68 | 39.75 | 26.23 | 48.32 | ||||||||||||
| 1984 | 20.92 | 30.47 | 40.85 | 43.03 | 54.98 | 57.08 | 71.56 | 71.73 | 58.58 | 45.77 | 38.15 | 25.35 | 46.54 | |||||||||||||
| 1985 | 24.44 | 29.12 | 35.89 | 50.98 | 56.03 | 64.52 | 74.32 | 65.40 | 52.07 | a | 46.81 | j | 30.13 | 22.60 | 45.95 | |||||||||||
| 1986 | 34.44 | 39.71 | 45.23 | 45.87 | 54.80 | a | 68.73 | 69.71 | 73.37 | 52.98 | 49.29 | 39.87 | 27.89 | 50.16 | ||||||||||||
| 1987 | 27.48 | 33.56 | b | 39.69 | 52.60 | 56.65 | 65.92 | 65.58 | 65.89 | 60.42 | 50.98 | 36.02 | 28.71 | 48.62 | ||||||||||||
| 1988 | 26.07 | b | 36.10 | 39.15 | 48.33 | 55.08 | 66.30 | 72.82 | 68.65 | 59.72 | 57.81 | 38.60 | 26.97 | 49.63 | ||||||||||||
| 1989 | 27.31 | 23.75 | 41.55 | 49.38 | 51.47 | 63.30 | 71.87 | 64.48 | 58.25 | 48.40 | 37.97 | 31.37 | 47.43 | |||||||||||||
| 1990 | 31.60 | 29.68 | 38.66 | 50.57 | 52.94 | o | ----- | z | 71.90 | 69.35 | 64.45 | ----- | z | 40.19 | n | 22.02 | 47.28 | |||||||||
| 1991 | 30.68 | 40.93 | 39.16 | 44.40 | 49.84 | 58.58 | 71.03 | 71.16 | 62.92 | 50.39 | 38.15 | 30.45 | 48.97 | |||||||||||||
| 1992 | 33.92 | 40.09 | 43.69 | 50.73 | 60.03 | 65.47 | 68.08 | 70.52 | 61.08 | 52.02 | 32.42 | 27.00 | 50.42 | |||||||||||||
| 1993 | 22.40 | 25.80 | 41.92 | 46.02 | 58.77 | 58.43 | 60.05 | 63.52 | 60.37 | 50.32 | 32.53 | 32.13 | 46.02 | |||||||||||||
| 1994 | 36.61 | 32.68 | 44.26 | 48.72 | 56.29 | 62.87 | 71.08 | 69.58 | 61.72 | 47.32 | 30.60 | 28.16 | 49.16 | |||||||||||||
| 1995 | 33.31 | 41.75 | 38.55 | 43.55 | 52.00 | 59.23 | 68.85 | 65.92 | 61.92 | 49.31 | 45.88 | 32.97 | 49.44 | |||||||||||||
| 1996 | 34.23 | 34.62 | 42.90 | 47.58 | 50.60 | 62.77 | 72.39 | 69.68 | 58.48 | 49.87 | 40.57 | 35.45 | 49.93 | |||||||||||||
| 1997 | 32.00 | 33.75 | 44.42 | 44.45 | 56.89 | 62.12 | 68.60 | 70.00 | 61.83 | 48.63 | 40.58 | 27.39 | 49.22 | |||||||||||||
| 1998 | 36.08 | 35.12 | 40.31 | 43.27 | 50.53 | 57.98 | 73.61 | 71.84 | 63.95 | 46.63 | 39.17 | 28.15 | 48.89 | |||||||||||||
| 1999 | 34.03 | 34.77 | 39.31 | 42.25 | 50.94 | 59.42 | 69.47 | 68.47 | 58.77 | 51.69 | 42.93 | 29.71 | 48.48 | |||||||||||||
| 2000 | 32.74 | 37.66 | 39.00 | 49.82 | 55.61 | 64.35 | 69.63 | 70.27 | 58.17 | 45.97 | 30.87 | 28.92 | 48.58 | |||||||||||||
| 2001 | 24.56 | 30.04 | 41.31 | 42.32 | 57.40 | 62.67 | 68.73 | 73.82 | 64.68 | 54.46 | f | 40.71 | b | 31.55 | a | 48.89 | ||||||||||
| 2002 | 32.50 | 35.05 | 38.10 | 48.15 | 54.43 | d | 66.25 | 76.44 | 67.13 | 62.12 | 46.69 | e | 40.30 | 36.74 | 50.32 | |||||||||||
| 2003 | 38.26 | 34.34 | 44.65 | 44.62 | e | 54.42 | f | 64.06 | l | 77.90 | j | 73.03 | m | 62.02 | h | 56.24 | h | 37.12 | d | 35.48 | j | 39.80 | ||||
| 2004 | 28.58 | l | 31.42 | j | 46.24 | j | 48.96 | f | 55.03 | l | 61.42 | l | ----- | z | ----- | z | 57.14 | w | 45.62 | s | 37.27 | d | 34.00 | m | 37.27 | |
| 2005 | 30.18 | f | 32.81 | g | 41.15 | k | 46.46 | e | 53.66 | 58.39 | g | 72.97 | 71.98 | i | ----- | z | 52.00 | k | 36.90 | d | 30.91 | d | 48.18 | |||
| 2006 | 36.33 | h | 33.28 | l | 36.98 | i | 44.11 | l | ----- | z | 66.12 | i | 76.90 | 67.50 | u | ----- | z | 48.85 | r | 39.65 | g | 31.10 | g | 76.90 | ||
| 2007 | 28.33 | g | 37.05 | g | 45.53 | l | 45.95 | j | 56.82 | l | 65.78 | l | 78.22 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.50 | y | 42.67 | r | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 74.07 | q | 67.27 | 61.42 | 44.56 | 36.88 | 23.98 | 46.82 | ||||||
| 2010 | 34.73 | 33.79 | 34.82 | 41.82 | 47.95 | 59.85 | 68.50 | 66.74 | 62.92 | 52.79 | 36.65 | 34.08 | 47.89 | |||||||||||||
| 2011 | 31.57 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.57 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 30.14 | 34.77 | 39.54 | 45.33 | 53.74 | 62.14 | 70.27 | 68.41 | 59.98 | 49.50 | 37.84 | 30.66 | 48.55 | |||||||||||||
| S.D. | 4.67 | 3.92 | 3.03 | 3.54 | 3.12 | 3.01 | 2.92 | 2.86 | 3.14 | 2.81 | 3.31 | 3.82 | 1.13 | |||||||||||||
| SKEW | -0.68 | -0.49 | 0.17 | -0.12 | 0.22 | 0.41 | -0.57 | 0.12 | -0.80 | 0.36 | -0.50 | -0.07 | -0.23 | |||||||||||||
| MAX | 38.26 | 41.75 | 45.23 | 52.60 | 60.56 | 68.73 | 76.90 | 73.82 | 64.93 | 57.81 | 45.88 | 38.25 | 50.66 | |||||||||||||
| MIN | 20.11 | 23.75 | 34.79 | 36.67 | 47.95 | 57.08 | 60.05 | 62.44 | 52.07 | 44.56 | 30.13 | 22.02 | 46.02 | |||||||||||||
| NO YRS | 50 | 48 | 49 | 49 | 47 | 46 | 48 | 47 | 47 | 44 | 51 | 49 | 40 | |||||||||||||