| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.33 | r | ----- | z | ----- | z | 34.30 | a | 34.30 | |
| 1961 | 38.13 | a | 38.70 | a | 39.25 | a | 46.00 | a | 50.98 | 65.22 | 67.82 | 69.81 | 55.18 | 48.37 | 38.37 | 33.98 | 49.32 | |||||||||
| 1962 | 31.32 | 36.04 | 37.11 | 48.67 | 47.53 | 58.83 | 64.82 | 62.44 | 61.75 | 49.82 | 42.52 | 37.15 | 48.17 | |||||||||||||
| 1963 | 30.52 | 42.57 | ----- | z | ----- | z | 52.77 | 56.72 | 59.39 | 63.52 | 63.58 | ----- | z | 40.38 | ----- | z | 51.18 | |||||||||
| 1964 | ----- | z | 35.57 | ----- | z | ----- | z | ----- | z | ----- | z | 63.40 | 61.44 | 56.08 | 51.13 | 36.85 | 33.44 | 48.27 | ||||||||
| 1965 | 33.40 | 37.38 | 41.94 | 47.33 | 48.58 | 57.13 | 64.84 | 63.61 | 55.22 | 52.40 | 41.90 | 33.35 | 48.09 | |||||||||||||
| 1966 | 32.48 | 34.79 | 37.21 | 46.45 | 53.45 | 56.73 | 61.66 | 63.53 | 59.70 | 49.71 | 41.90 | 34.85 | 47.71 | |||||||||||||
| 1967 | 34.71 | 36.84 | 37.87 | 39.85 | 51.44 | 60.37 | 65.89 | 69.52 | 63.32 | 48.53 | 43.15 | 31.97 | 48.62 | |||||||||||||
| 1968 | 31.08 | 39.74 | 43.18 | 43.05 | 50.32 | 58.65 | ----- | z | 62.10 | 59.32 | 47.13 | 40.03 | 32.10 | 46.06 | ||||||||||||
| 1969 | 28.53 | 32.82 | 37.76 | 43.22 | 54.63 | 61.15 | 63.63 | 62.34 | 58.90 | 45.81 | 41.65 | 36.21 | 47.22 | |||||||||||||
| 1970 | 34.34 | 40.09 | 40.37 | 40.33 | 51.53 | 61.97 | 65.35 | 64.56 | 53.65 | 47.31 | 40.38 | 31.27 | 47.60 | |||||||||||||
| 1971 | 30.13 | 34.36 | 33.71 | 40.92 | 50.44 | 53.98 | 65.84 | 67.19 | 54.95 | 45.55 | 38.17 | 31.79 | 45.58 | |||||||||||||
| 1972 | 29.95 | 34.69 | 39.87 | 41.23 | 53.31 | 59.20 | 66.83 | a | 66.73 | 55.17 | 49.47 | ----- | z | 28.56 | 47.73 | |||||||||||
| 1973 | 30.02 | 39.23 | 39.87 | 45.80 | 54.53 | 58.00 | 64.79 | 62.97 | 58.45 | 48.60 | 35.17 | 34.97 | 47.70 | |||||||||||||
| 1974 | 29.97 | 35.23 | 38.39 | 43.52 | 49.61 | 59.90 | 63.10 | 65.29 | 63.92 | 52.27 | 41.42 | 35.69 | 48.19 | |||||||||||||
| 1975 | 33.58 | 34.00 | 38.03 | 40.07 | 50.13 | 56.82 | 65.60 | 61.16 | 62.78 | 48.10 | 37.27 | 35.52 | 46.92 | |||||||||||||
| 1976 | 34.10 | 34.52 | 37.52 | 42.63 | 52.39 | 55.05 | 63.48 | 61.58 | 61.30 | 51.58 | 44.82 | 35.45 | 47.87 | |||||||||||||
| 1977 | 33.61 | 42.46 | 37.94 | 48.25 | 46.47 | 61.82 | ----- | z | 68.13 | 56.32 | 50.37 | 37.87 | 37.89 | 47.37 | ||||||||||||
| 1978 | 36.18 | 39.45 | 45.76 | 44.30 | 49.50 | 60.15 | 65.32 | 62.45 | 54.70 | 53.31 | 35.75 | 30.58 | 48.12 | |||||||||||||
| 1979 | 28.55 | 33.84 | 42.95 | 44.40 | 53.82 | 59.40 | 64.65 | 62.94 | 61.70 | 53.85 | 39.43 | 37.10 | 48.55 | |||||||||||||
| 1980 | 32.90 | 40.62 | 40.19 | 46.45 | 50.71 | 54.80 | 65.13 | 61.08 | 58.55 | 51.92 | 42.30 | 35.55 | 48.35 | |||||||||||||
| 1981 | 40.35 | 38.64 | 42.50 | 45.48 | 50.77 | 56.25 | 62.79 | 67.21 | 59.43 | 48.02 | 41.30 | 35.69 | 49.04 | |||||||||||||
| 1982 | 31.85 | 33.71 | 39.56 | 42.73 | 51.05 | 59.80 | 63.32 | 64.47 | 56.78 | 48.97 | 38.15 | 35.26 | 47.14 | |||||||||||||
| 1983 | 37.21 | 39.79 | 43.06 | 45.37 | 55.48 | 57.15 | 60.94 | 65.44 | 57.40 | 53.97 | 41.08 | 30.02 | 48.91 | |||||||||||||
| 1984 | 35.03 | 38.38 | 43.61 | 42.58 | 50.39 | 56.13 | 67.42 | 65.21 | 57.50 | 46.63 | 37.83 | 31.53 | 47.69 | |||||||||||||
| 1985 | 33.19 | 34.50 | 39.11 | 48.10 | 52.50 | 60.65 | 68.92 | 62.02 | 54.05 | 48.02 | 31.95 | 31.29 | 47.02 | |||||||||||||
| 1986 | 37.06 | 37.34 | 45.63 | 45.38 | a | 52.73 | 62.73 | 60.82 | 68.31 | ----- | z | 52.40 | 45.98 | 35.89 | 49.48 | |||||||||||
| 1987 | 32.00 | 38.41 | 42.27 | 52.57 | 55.69 | 62.75 | 62.84 | 65.69 | 62.25 | ----- | z | 41.75 | 33.19 | 49.95 | ||||||||||||
| 1988 | 31.34 | 37.71 | a | 41.06 | 47.80 | 51.35 | 58.75 | 66.53 | 66.19 | 60.55 | 57.42 | 39.60 | 33.81 | 49.34 | ||||||||||||
| 1989 | 32.35 | 28.46 | 38.08 | 49.62 | 51.71 | 61.75 | 62.82 | 62.81 | 60.98 | 49.13 | 40.47 | 34.44 | 47.72 | |||||||||||||
| 1990 | 36.69 | 31.48 | 40.92 | 50.65 | 51.21 | 59.08 | 67.94 | 66.03 | 63.45 | 47.68 | 40.22 | 27.05 | 48.53 | |||||||||||||
| 1991 | 32.31 | 42.79 | 39.63 | 43.10 | 48.95 | 55.92 | 66.87 | 67.58 | 63.93 | 52.69 | 41.65 | 36.02 | 49.29 | |||||||||||||
| 1992 | 36.55 | 42.72 | 48.69 | 50.03 | 61.26 | 63.13 | 65.55 | 67.37 | 59.32 | 52.32 | 39.37 | 31.34 | 51.47 | |||||||||||||
| 1993 | 28.68 | 32.36 | 40.69 | 44.22 | 55.39 | 57.25 | 58.74 | 63.81 | 61.93 | 53.15 | 35.25 | 34.11 | 47.13 | |||||||||||||
| 1994 | 36.90 | 35.77 | 43.63 | 48.58 | 54.87 | 57.33 | 68.19 | 64.63 | 62.62 | 49.10 | 32.33 | 30.94 | 48.74 | |||||||||||||
| 1995 | 34.89 | 40.95 | 40.24 | 44.27 | 54.03 | 59.13 | 66.85 | 61.90 | 62.93 | 48.34 | 44.67 | 37.27 | 49.62 | |||||||||||||
| 1996 | 35.61 | 32.40 | 40.89 | 46.48 | 49.98 | 58.78 | 69.08 | 66.66 | 57.03 | 48.76 | 39.83 | 33.31 | 48.24 | |||||||||||||
| 1997 | 32.84 | 38.39 | 40.77 | 44.65 | 56.53 | 57.40 | 64.23 | 67.13 | 60.48 | 48.08 | 43.07 | 33.95 | 48.96 | |||||||||||||
| 1998 | 37.00 | 37.98 | 41.10 | 46.00 | 50.00 | 59.30 | 69.74 | 67.68 | 63.03 | 48.34 | 39.98 | 30.56 | 49.23 | |||||||||||||
| 1999 | 33.60 | 33.23 | 37.82 | 43.35 | 48.63 | 56.78 | 64.19 | 66.39 | 60.08 | 52.48 | 43.08 | 34.71 | 47.86 | |||||||||||||
| 2000 | 32.10 | 35.93 | 39.82 | 48.72 | 51.52 | 60.83 | 64.34 | 65.24 | 59.62 | 50.69 | g | 37.24 | i | 33.70 | k | 50.90 | ||||||||||
| 2001 | 34.00 | j | 36.66 | i | 44.25 | i | 45.00 | i | 55.24 | j | 58.53 | j | 66.03 | k | 67.37 | h | 61.59 | n | 50.24 | j | 40.72 | j | 32.52 | j | 9999.00 | |
| 2002 | 31.45 | j | 35.80 | h | 37.38 | j | 46.98 | 50.25 | i | 61.08 | l | 70.12 | k | 65.67 | j | 61.38 | j | 48.91 | h | 40.98 | i | 36.38 | j | 46.98 | ||
| 2003 | 38.19 | j | 38.66 | i | 41.52 | j | 43.61 | h | 54.43 | i | 63.48 | i | 69.64 | i | 68.08 | f | 62.17 | 49.71 | c | 37.43 | g | 33.71 | 48.53 | |||
| 2004 | 31.59 | h | 36.57 | 44.90 | 49.22 | 53.54 | h | 58.76 | e | 68.06 | m | 67.32 | 58.83 | g | 50.86 | f | 39.96 | e | 34.40 | f | 49.46 | |||||
| 2005 | 33.10 | j | 37.54 | d | 43.84 | f | 45.52 | c | 52.94 | 56.48 | a | 68.45 | a | 66.59 | b | 57.73 | 50.10 | 37.70 | 30.53 | a | 50.36 | |||||
| 2006 | 34.52 | 34.68 | 37.77 | a | 46.60 | 57.23 | ----- | z | 70.76 | b | 66.32 | 60.33 | 50.95 | b | ----- | z | ----- | z | 51.02 | |||||||
| 2007 | 32.54 | e | 37.33 | d | 44.26 | d | 44.72 | ----- | z | 58.77 | 68.74 | 63.76 | ----- | z | 45.74 | ----- | z | 31.69 | 47.51 | |||||||
| 2008 | 28.50 | 34.98 | 34.84 | 38.87 | 51.66 | 56.02 | 66.24 | 65.15 | 60.27 | 49.65 | 41.80 | 32.00 | a | 46.66 | ||||||||||||
| 2009 | 30.81 | 33.79 | 35.87 | 42.78 | 54.98 | 60.60 | a | 68.53 | 65.05 | 61.55 | 46.19 | 36.98 | 29.15 | 47.19 | ||||||||||||
| 2010 | 37.03 | 39.68 | 39.10 | 43.03 | 48.21 | 55.10 | 66.48 | 66.05 | 58.48 | 50.13 | 36.80 | 32.45 | 47.71 | |||||||||||||
| 2011 | 32.73 | 33.30 | a | 35.08 | 40.18 | 46.95 | 56.23 | 61.97 | 66.71 | 63.18 | 50.45 | 36.87 | c | 31.65 | 46.27 | |||||||||||
| 2012 | 32.65 | 34.60 | 35.24 | 46.10 | 51.19 | 55.72 | 64.90 | 67.23 | ----- | z | 49.81 | 39.75 | 33.15 | 46.39 | ||||||||||||
| 2013 | 28.73 | 34.27 | 40.35 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.45 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 33.16 | 36.61 | 40.12 | 45.13 | 51.94 | 58.61 | 65.21 | 65.07 | 59.60 | 49.86 | 39.71 | 33.33 | 48.10 | |||||||||||||
| S.D. | 2.87 | 3.19 | 3.11 | 3.10 | 2.89 | 2.50 | 2.71 | 2.29 | 2.99 | 2.51 | 3.02 | 2.45 | 1.09 | |||||||||||||
| SKEW | 0.25 | 0.07 | 0.34 | 0.08 | 0.66 | 0.41 | -0.23 | -0.03 | -0.34 | 0.54 | -0.43 | -0.28 | 0.39 | |||||||||||||
| MAX | 40.35 | 42.79 | 48.69 | 52.57 | 61.26 | 65.22 | 70.76 | 69.81 | 63.93 | 57.42 | 45.98 | 37.89 | 51.47 | |||||||||||||
| MIN | 28.50 | 28.46 | 33.71 | 38.87 | 46.47 | 53.98 | 58.74 | 61.08 | 53.65 | 45.55 | 31.95 | 27.05 | 45.58 | |||||||||||||
| NO YRS | 47 | 50 | 47 | 48 | 46 | 47 | 46 | 49 | 46 | 46 | 45 | 47 | 36 | |||||||||||||