| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.11 | p | 46.61 | 36.29 | d | 23.78 | o | 41.45 | ||
| 1960 | 25.82 | c | 30.47 | l | 40.73 | 44.13 | g | 48.46 | d | 63.28 | 68.59 | h | 60.65 | h | 57.76 | m | 46.87 | h | ----- | z | 27.14 | q | 44.57 | |||
| 1961 | 26.19 | r | 36.47 | l | 37.54 | q | 41.62 | 48.77 | 64.87 | g | 67.80 | a | 68.40 | 52.55 | 43.72 | b | 29.08 | 24.21 | q | 50.28 | ||||||
| 1962 | 19.64 | i | 31.79 | g | 33.19 | 47.13 | 47.61 | 58.18 | 65.60 | g | 63.79 | c | 59.16 | a | 47.77 | a | 37.64 | b | 34.14 | j | 49.31 | |||||
| 1963 | 24.10 | 40.27 | 35.32 | 37.52 | 52.95 | a | 55.47 | 62.56 | d | 63.41 | b | 59.25 | 48.11 | 35.47 | 27.78 | b | 45.18 | |||||||||
| 1964 | 26.03 | 29.22 | 32.73 | 39.43 | 46.26 | 54.48 | 65.95 | 62.89 | 52.67 | 47.56 | 31.37 | 30.85 | 43.29 | |||||||||||||
| 1965 | 29.05 | 33.62 | 33.82 | 44.46 | e | 47.52 | d | 55.39 | c | 64.60 | g | 61.08 | a | 49.75 | 46.50 | 36.33 | d | 22.75 | a | 41.84 | ||||||
| 1966 | 25.04 | c | 24.82 | c | 33.69 | e | 42.81 | f | 57.14 | c | 59.35 | c | 64.39 | c | 67.29 | c | 58.79 | b | 45.67 | e | 38.46 | e | 30.29 | 45.90 | ||
| 1967 | 31.23 | 35.36 | 34.77 | a | 34.81 | c | 52.09 | b | 58.46 | b | 69.88 | b | 69.76 | 60.23 | 47.33 | a | 37.72 | a | 25.45 | 46.42 | ||||||
| 1968 | 26.71 | 37.20 | a | 39.10 | b | 41.54 | d | 50.72 | b | 61.83 | c | 68.50 | d | 60.83 | a | 56.19 | c | 45.07 | a | 36.80 | 28.78 | b | 46.11 | |||
| 1969 | 31.42 | a | 30.24 | a | 34.36 | b | 43.90 | 56.09 | d | 59.17 | 67.24 | d | 65.92 | a | 58.60 | a | 40.37 | a | 35.20 | 31.73 | a | 46.19 | ||||
| 1970 | 31.34 | f | 36.21 | 36.81 | b | 37.34 | b | 51.87 | a | 63.64 | h | 67.69 | d | 66.24 | b | 52.55 | a | 40.77 | a | 38.79 | m | 26.92 | e | 46.27 | ||
| 1971 | 33.35 | 33.81 | a | 33.68 | ----- | z | 50.02 | c | 57.62 | a | 66.64 | q | 69.27 | c | 52.10 | 41.91 | b | 35.16 | e | 23.37 | a | 43.03 | ||||
| 1972 | 26.00 | h | 32.81 | b | 43.06 | e | 40.75 | f | 53.63 | e | 62.70 | h | 67.81 | d | 66.27 | e | 53.87 | c | 43.77 | a | 34.15 | c | 20.90 | e | 46.25 | |
| 1973 | 26.69 | d | 34.45 | f | 35.60 | f | 44.47 | 55.66 | b | 61.02 | e | 67.98 | d | 64.70 | c | 56.80 | h | 44.93 | c | 36.85 | c | 34.28 | f | 50.29 | ||
| 1974 | 27.12 | a | 32.63 | b | 39.20 | d | 42.38 | e | 52.02 | g | 62.72 | u | 66.13 | e | 63.90 | p | ----- | z | ----- | z | ----- | z | 25.47 | l | 41.49 | |
| 1975 | 27.02 | b | 30.70 | e | 35.58 | 37.18 | b | 50.88 | c | 56.54 | g | 68.70 | a | 63.00 | f | 58.23 | b | 43.31 | m | 31.18 | e | 32.29 | e | 41.31 | ||
| 1976 | 29.86 | c | 32.12 | c | 33.00 | 40.90 | d | 54.97 | b | 58.22 | a | 68.65 | d | 60.27 | a | 57.73 | b | 45.81 | b | 38.90 | e | 28.30 | c | 45.73 | ||
| 1977 | 20.74 | 33.61 | f | 31.90 | b | 46.93 | g | 47.19 | b | 66.45 | b | 67.67 | e | 66.87 | d | 55.59 | a | 46.16 | f | 35.98 | e | 33.40 | j | 49.05 | ||
| 1978 | 33.65 | e | 34.41 | 43.38 | c | 43.57 | 48.59 | d | 58.10 | i | 67.34 | b | 64.98 | d | 53.46 | d | 47.34 | c | 31.10 | d | 22.48 | a | 44.57 | |||
| 1979 | 21.86 | b | 32.35 | b | 39.77 | c | 43.68 | b | 53.88 | b | 59.90 | a | 69.35 | g | 66.05 | b | ----- | z | ----- | z | ----- | z | 34.25 | s | 45.35 | |
| 1980 | 32.43 | i | 38.13 | j | 35.88 | s | 47.30 | o | 53.73 | i | 54.76 | i | 66.79 | q | 63.00 | r | 56.57 | o | 46.55 | j | 44.64 | w | 32.44 | o | 9999.00 | |
| 1981 | 28.55 | j | 33.75 | l | 37.47 | n | 50.46 | p | 50.80 | i | 59.88 | m | 66.21 | j | 66.89 | c | 60.15 | f | 42.98 | i | 36.53 | j | 35.50 | d | 51.20 | |
| 1982 | 29.11 | 30.96 | 36.11 | 39.40 | 50.92 | 58.77 | ----- | z | 69.06 | m | ----- | z | ----- | z | ----- | z | 26.61 | 38.84 | ||||||||
| 1983 | 31.68 | 36.00 | 38.82 | 39.67 | 50.85 | 57.90 | a | 62.60 | 64.80 | c | 56.27 | 47.42 | 36.62 | a | ----- | z | 47.51 | |||||||||
| 1984 | 27.38 | f | 30.50 | b | 39.27 | c | 41.00 | d | 51.91 | b | 54.75 | b | 69.69 | j | 67.18 | k | 54.12 | d | 41.11 | 34.40 | d | 21.73 | e | 40.98 | ||
| 1985 | 23.73 | c | 27.41 | e | 33.90 | b | 47.89 | c | 51.00 | o | 61.94 | e | 70.48 | h | 62.34 | c | 49.15 | f | 43.78 | m | 28.81 | n | 25.83 | h | 42.87 | |
| 1986 | 34.50 | 37.66 | 40.78 | k | 43.52 | a | 52.11 | 64.73 | 64.08 | 69.10 | 49.43 | ----- | z | 40.84 | n | 26.55 | a | 49.08 | ||||||||
| 1987 | 25.39 | 32.71 | 36.96 | c | 47.44 | m | 55.60 | 62.33 | 64.87 | h | 65.00 | a | 58.65 | j | 49.70 | i | 35.75 | ----- | z | 44.82 | ||||||
| 1988 | 25.77 | c | 34.22 | 37.68 | a | 47.03 | 48.28 | o | 59.70 | h | 70.47 | 65.58 | 55.30 | 52.03 | 35.43 | 23.55 | 44.71 | |||||||||
| 1989 | 23.05 | 23.64 | 36.12 | w | 46.53 | m | 50.25 | u | 62.28 | u | 70.85 | u | 61.30 | p | 55.30 | 44.35 | 34.65 | 29.06 | 35.01 | |||||||
| 1990 | 31.26 | 28.21 | 39.55 | 50.02 | 49.92 | 60.35 | 67.92 | 66.29 | 59.78 | 45.28 | h | 34.42 | 18.05 | 45.98 | ||||||||||||
| 1991 | 26.58 | 36.26 | a | 36.02 | a | 42.13 | 47.62 | j | 56.44 | m | 66.71 | l | 66.94 | 58.45 | 47.29 | 39.24 | k | 29.52 | j | 44.81 | ||||||
| 1992 | 29.12 | a | 38.72 | k | 40.18 | 48.07 | 58.56 | 61.42 | 66.39 | 66.95 | 56.83 | 47.32 | l | 32.70 | 23.63 | 48.38 | ||||||||||
| 1993 | 20.29 | 23.38 | 41.74 | 43.37 | 54.97 | ----- | z | 60.45 | 62.42 | 55.92 | 46.45 | 31.95 | j | 31.48 | g | 45.44 | ||||||||||
| 1994 | 31.69 | 29.70 | 41.03 | 46.28 | n | 54.53 | 60.92 | l | 71.25 | a | 66.44 | 57.17 | 46.45 | t | 26.91 | n | 23.81 | 46.95 | ||||||||
| 1995 | 30.87 | 39.66 | 37.47 | l | 41.67 | z | 51.47 | m | 54.72 | n | 65.79 | s | 64.59 | n | 59.18 | p | 46.40 | p | 34.20 | y | 41.71 | x | 35.27 | |||
| 1996 | 27.21 | s | 33.75 | s | 39.00 | s | 45.69 | n | 51.67 | p | 59.32 | p | 71.43 | q | 64.93 | q | 54.46 | p | 49.13 | p | 38.80 | t | 31.29 | q | 9999.00 | |
| 1997 | 27.30 | p | 30.96 | p | 41.14 | m | 42.35 | q | 56.18 | l | 60.93 | p | 68.16 | l | 66.21 | 58.17 | 45.87 | ----- | z | ----- | z | 56.75 | ||||
| 1998 | ----- | z | 33.29 | ----- | z | 42.95 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.45 | 33.90 | ||||
| 1999 | 31.45 | a | 32.65 | e | 37.05 | i | 40.48 | g | 48.94 | o | 54.17 | u | 63.62 | w | 61.20 | z | 56.22 | u | 49.50 | r | 33.65 | t | ----- | z | 32.05 | |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.00 | 35.95 | 29.98 | a | 38.64 | |||
| 2002 | 28.25 | z | 34.00 | 37.48 | 46.72 | 53.79 | 64.28 | 73.53 | 65.26 | 58.72 | 44.23 | 35.72 | 32.18 | 49.63 | ||||||||||||
| 2003 | 38.61 | 30.18 | 41.84 | 41.38 | 54.55 | 65.25 | 73.52 | g | 68.24 | 60.12 | 52.89 | 31.75 | 33.19 | 47.09 | ||||||||||||
| 2004 | 31.84 | 33.09 | 44.82 | 46.97 | 53.79 | 62.82 | h | 71.35 | g | 68.53 | 57.48 | 48.24 | f | 34.40 | 31.35 | 44.70 | ||||||||||
| 2005 | 24.59 | c | 32.16 | 39.73 | 43.30 | j | 54.08 | f | 58.00 | g | 72.31 | 68.67 | j | 54.30 | 46.40 | 36.02 | ----- | z | 43.64 | |||||||
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 28.16 | 32.40 | 37.55 | 42.76 | 52.12 | 60.02 | 67.39 | 65.59 | 56.07 | 45.97 | 35.02 | 27.13 | 45.49 | |||||||||||||
| S.D. | 4.23 | 3.99 | 3.49 | 3.70 | 3.16 | 3.35 | 3.07 | 2.47 | 2.97 | 3.01 | 2.35 | 4.32 | 1.16 | |||||||||||||
| SKEW | 0.18 | -0.38 | 0.20 | -0.09 | -0.04 | 0.11 | -0.25 | -0.46 | -0.55 | 0.17 | -0.73 | -0.08 | -1.30 | |||||||||||||
| MAX | 38.61 | 40.27 | 44.82 | 50.02 | 58.56 | 66.45 | 73.53 | 69.76 | 60.23 | 52.89 | 38.90 | 35.50 | 46.42 | |||||||||||||
| MIN | 20.29 | 23.38 | 31.90 | 34.81 | 46.26 | 54.48 | 60.45 | 60.27 | 49.43 | 40.37 | 29.08 | 18.05 | 43.29 | |||||||||||||
| NO YRS | 33 | 34 | 33 | 29 | 31 | 24 | 24 | 32 | 31 | 27 | 29 | 27 | 6 | |||||||||||||