| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1951 | 21.59 | n | 27.63 | a | 28.50 | e | 37.78 | g | 45.07 | c | 47.32 | e | 58.73 | e | 57.93 | d | 48.33 | f | 37.21 | g | 30.06 | l | 22.93 | q | 44.20 | |
| 1952 | 21.10 | j | 22.05 | g | 24.19 | j | 40.43 | w | 45.15 | e | 49.81 | i | 56.40 | f | 53.36 | t | 46.28 | l | 41.88 | o | 22.58 | r | 23.47 | n | 45.15 | |
| 1953 | 32.58 | l | 28.74 | i | 31.76 | f | 34.46 | f | 39.35 | e | 45.24 | e | 56.15 | d | 55.11 | d | 51.41 | c | 41.73 | e | 36.05 | h | 24.53 | l | 48.16 | |
| 1954 | 28.00 | k | 30.45 | h | 27.78 | h | 35.17 | l | 43.33 | j | 47.32 | h | 55.90 | k | 51.23 | i | 46.71 | p | 36.41 | n | 30.36 | s | 22.19 | j | 9999.00 | |
| 1955 | 17.14 | j | 21.20 | h | 27.55 | i | 34.86 | i | 42.14 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.50 | 58.97 | 57.29 | 52.40 | 40.48 | 28.33 | 27.87 | 45.69 | ||||||||
| 1958 | 23.48 | 33.82 | 31.68 | 37.53 | 51.74 | 54.90 | 60.00 | 61.06 | 47.90 | 41.19 | 30.97 | 28.77 | 41.92 | |||||||||||||
| 1959 | 27.00 | 27.75 | 28.58 | 35.67 | 38.32 | 50.17 | 56.26 | 51.06 | 48.67 | 41.65 | 28.93 | 24.60 | a | 38.22 | ||||||||||||
| 1960 | 20.23 | 25.83 | 33.65 | 38.07 | 43.03 | 52.17 | 62.87 | 52.42 | 50.60 | 41.97 | 34.17 | 25.06 | 40.00 | |||||||||||||
| 1961 | 26.29 | 33.54 | 35.16 | 37.13 | 45.35 | 58.27 | 62.03 | 64.33 | a | 47.20 | 39.58 | 29.80 | 24.13 | 41.90 | ||||||||||||
| 1962 | 14.00 | 25.89 | 29.90 | 40.60 | 44.20 | a | 52.03 | 57.74 | 55.77 | 51.77 | 41.74 | 33.27 | 28.35 | 39.61 | ||||||||||||
| 1963 | 16.52 | 33.43 | 32.32 | 36.50 | 47.97 | 50.03 | 54.90 | 57.16 | 57.77 | 47.97 | 36.50 | b | 23.94 | 41.25 | ||||||||||||
| 1964 | 21.12 | g | 18.11 | j | 26.41 | i | 34.69 | a | 41.52 | 52.03 | 60.10 | a | 55.42 | 46.57 | 42.22 | d | 29.74 | k | 26.54 | g | 47.51 | |||||
| 1965 | 26.10 | k | 26.54 | 26.19 | 39.17 | a | 42.00 | a | 52.10 | 60.29 | 59.13 | 45.47 | 44.10 | b | 37.75 | j | 25.76 | j | 43.89 | |||||||
| 1966 | 26.86 | j | 23.47 | i | 31.09 | h | 37.90 | 48.10 | 52.83 | 58.94 | 59.00 | a | 54.93 | 39.07 | d | 36.10 | j | 26.14 | j | 50.11 | ||||||
| 1967 | 27.67 | j | 28.21 | i | 31.70 | k | 34.13 | g | 42.74 | 52.43 | 62.58 | 63.32 | 56.70 | 40.76 | f | 32.35 | j | 19.65 | k | 55.56 | ||||||
| 1968 | 22.68 | i | 31.40 | i | 33.81 | j | 32.97 | a | 42.97 | 51.00 | 60.55 | 56.61 | 49.10 | 39.67 | d | 32.00 | k | 25.71 | j | 47.55 | ||||||
| 1969 | 23.09 | i | 26.33 | j | 27.76 | j | 36.89 | b | 46.45 | 53.17 | 57.81 | 56.87 | 51.73 | 35.37 | d | 32.61 | l | 26.57 | j | 48.33 | ||||||
| 1970 | 28.24 | j | 30.37 | i | 30.73 | a | 30.87 | 43.84 | 55.23 | 59.94 | 59.74 | 44.23 | 37.57 | a | 34.63 | 24.65 | 42.14 | |||||||||
| 1971 | 25.87 | 27.57 | 27.77 | 36.30 | 45.39 | 50.87 | 58.97 | 63.16 | 44.90 | 36.45 | 30.37 | 22.97 | 39.22 | |||||||||||||
| 1972 | 22.42 | 26.52 | 33.81 | 34.37 | 45.35 | 53.30 | 55.87 | 60.16 | 46.47 | 41.61 | 33.73 | 19.06 | 39.39 | |||||||||||||
| 1973 | 23.94 | 30.50 | 31.48 | 35.87 | 45.23 | 50.73 | 59.42 | 57.77 | 49.10 | 39.71 | 34.43 | 29.87 | 40.67 | |||||||||||||
| 1974 | 20.03 | 28.72 | c | 32.97 | 35.60 | 41.26 | 53.43 | 56.94 | 55.42 | 49.07 | 39.74 | 34.63 | 24.77 | 39.38 | ||||||||||||
| 1975 | 18.65 | 26.93 | 28.29 | 31.60 | 39.71 | 48.73 | 62.55 | 55.74 | 51.47 | 40.84 | 29.00 | 24.58 | 38.17 | |||||||||||||
| 1976 | 23.87 | 25.41 | 26.52 | 35.13 | 42.68 | 44.67 | 56.84 | 53.74 | 50.33 | 37.23 | 30.07 | 20.10 | 37.22 | |||||||||||||
| 1977 | 11.61 | 22.46 | 25.80 | a | 35.21 | a | 39.52 | 54.00 | 53.61 | 59.10 | 48.50 | 41.16 | 29.73 | 30.35 | 37.59 | |||||||||||
| 1978 | 29.65 | 30.00 | 34.84 | 40.00 | 41.61 | 49.77 | 56.65 | 53.45 | 47.60 | 39.26 | 26.37 | 19.35 | 39.04 | |||||||||||||
| 1979 | 8.97 | 27.29 | 31.58 | 36.33 | 42.65 | 48.40 | 56.90 | 58.16 | 50.63 | 42.68 | 27.18 | h | 28.07 | p | 40.36 | |||||||||||
| 1980 | 22.80 | k | 33.78 | f | 30.32 | 39.10 | 46.03 | 48.70 | 57.90 | 53.52 | 49.83 | 39.21 | c | 32.87 | 27.54 | c | 42.50 | |||||||||
| 1981 | 29.35 | 28.79 | 34.71 | 37.79 | b | 43.19 | 49.50 | 55.13 | 59.87 | 50.83 | a | 36.92 | f | 37.03 | 29.90 | 41.46 | ||||||||||
| 1982 | 18.32 | 21.71 | 32.39 | 34.23 | 40.71 | 52.67 | 57.84 | 58.81 | 49.20 | 40.29 | 29.73 | 26.19 | 38.51 | |||||||||||||
| 1983 | 29.45 | 32.64 | 36.94 | 37.10 | a | 45.19 | 49.53 | 54.48 | 62.52 | 47.13 | 41.57 | j | 35.03 | 20.16 | 40.93 | |||||||||||
| 1984 | 20.32 | 24.83 | 33.68 | 37.37 | 44.87 | 50.47 | 60.61 | 62.00 | 48.13 | 38.32 | 32.90 | 16.74 | 39.19 | |||||||||||||
| 1985 | 14.06 | 18.25 | 28.23 | 39.83 | 47.16 | 53.33 | ----- | z | 53.13 | 45.20 | 37.03 | 19.93 | 6.45 | 32.96 | ||||||||||||
| 1986 | 21.87 | 35.21 | 39.61 | 38.00 | 45.61 | 56.23 | 55.87 | 60.87 | 46.47 | 40.45 | 33.90 | 22.23 | 41.36 | |||||||||||||
| 1987 | 20.97 | 31.43 | 34.32 | 41.63 | 47.87 | 54.30 | 55.65 | 53.94 | 49.57 | 41.61 | 34.07 | 25.48 | 40.90 | |||||||||||||
| 1988 | 18.06 | 28.48 | 28.90 | 40.30 | 44.26 | 52.87 | 56.10 | 53.61 | 44.90 | 43.26 | 31.67 | 17.39 | 38.32 | |||||||||||||
| 1989 | 13.73 | a | 10.64 | 30.58 | 39.17 | 42.68 | 52.60 | 56.45 | 55.10 | 47.43 | 41.26 | 27.53 | 20.94 | o | 37.92 | |||||||||||
| 1990 | 23.69 | o | 19.40 | m | 29.13 | 38.13 | o | 41.16 | 49.13 | 55.90 | 56.26 | 53.17 | 38.06 | o | 24.93 | o | 14.00 | q | 47.46 | |||||||
| 1991 | 11.94 | n | 25.93 | m | 25.65 | n | 31.59 | m | 38.43 | j | 43.70 | 54.35 | 58.97 | 50.87 | 37.59 | n | 29.71 | p | 24.53 | p | 51.97 | |||||
| 1992 | 23.67 | p | 32.15 | p | 33.62 | o | 39.76 | m | 48.55 | i | 53.87 | ----- | z | 54.68 | 44.17 | 39.50 | m | 23.83 | r | 21.83 | m | 50.90 | ||||
| 1993 | 14.73 | p | 15.88 | l | 29.61 | m | 33.15 | j | 46.19 | 45.27 | 47.00 | 53.06 | 47.37 | 40.25 | o | 24.69 | q | 24.06 | n | 47.78 | ||||||
| 1994 | 27.80 | p | 23.93 | m | 32.42 | l | 40.15 | q | 47.00 | 49.03 | 57.74 | 56.26 | 49.83 | 38.44 | o | 22.27 | o | 22.53 | n | 51.97 | ||||||
| 1995 | 27.82 | n | 29.60 | m | 31.60 | k | 37.06 | n | 44.79 | l | 50.20 | 56.58 | 51.26 | 48.57 | 34.59 | n | 33.07 | o | 25.00 | o | 51.65 | |||||
| 1996 | 25.56 | o | 26.69 | m | 33.44 | m | 39.53 | m | 42.84 | l | 50.13 | 58.19 | 54.84 | 44.10 | 40.72 | m | 30.86 | p | 25.93 | q | 51.82 | |||||
| 1997 | 20.19 | o | 24.27 | m | 31.88 | o | 36.73 | o | 48.15 | k | 51.77 | 56.52 | 57.06 | 52.52 | a | 39.06 | m | 34.67 | r | 21.12 | o | 54.47 | ||||
| 1998 | 28.07 | p | 30.67 | m | 30.62 | o | 38.22 | l | 44.29 | 47.57 | 61.13 | 57.32 | 54.00 | 36.71 | n | 31.25 | r | 18.89 | m | 52.86 | ||||||
| 1999 | 22.94 | o | 23.31 | l | 28.89 | m | 30.60 | j | 37.86 | j | 48.13 | 50.97 | a | 55.03 | 43.04 | g | 33.65 | k | 31.32 | k | 21.57 | j | 51.38 | |||
| 2000 | 20.84 | l | 25.90 | i | 31.04 | h | 43.55 | j | 45.78 | h | 52.96 | e | 57.18 | c | 56.80 | a | 46.83 | 40.77 | i | 25.50 | l | 24.31 | o | 53.44 | ||
| 2001 | 20.88 | o | 22.67 | m | 34.14 | q | 37.89 | l | 45.14 | b | 48.89 | c | 57.86 | b | 60.32 | c | 52.24 | i | 38.65 | n | 31.78 | l | 22.58 | l | 53.05 | |
| 2002 | 21.75 | k | 20.58 | i | 27.28 | m | 34.42 | k | 41.52 | h | 52.96 | b | 62.08 | g | 53.74 | 50.77 | 35.00 | n | 31.55 | j | 30.62 | j | 52.49 | |||
| 2003 | 28.24 | j | 22.44 | l | 29.85 | k | 33.90 | j | 37.68 | f | 47.36 | e | 61.23 | 61.26 | 51.47 | 52.45 | k | 25.00 | l | 28.90 | k | 55.33 | ||||
| 2004 | 21.74 | l | 26.83 | k | 34.41 | i | 38.38 | i | 44.19 | e | 52.75 | b | 58.85 | e | 57.65 | 47.26 | g | 43.41 | n | 29.37 | k | 28.52 | j | 53.36 | ||
| 2005 | 23.79 | l | 24.71 | k | 32.87 | h | 36.24 | i | 43.20 | k | 48.59 | c | 56.73 | e | 57.77 | 45.83 | 41.23 | i | 28.58 | k | 18.00 | n | 52.23 | |||
| 2006 | 26.00 | n | 23.06 | k | 32.15 | k | 37.18 | m | 45.04 | f | 53.59 | a | 62.35 | e | 54.13 | 49.57 | 37.82 | n | 30.53 | m | 20.62 | r | 54.91 | |||
| 2007 | 16.59 | n | 27.00 | k | 31.75 | o | 33.47 | k | 44.29 | j | 54.67 | i | 63.33 | g | 56.12 | n | 49.14 | i | 38.89 | m | 30.40 | t | 23.50 | m | 9999.00 | |
| 2008 | 16.27 | p | 21.62 | u | 25.38 | o | 29.71 | p | 45.67 | s | 52.31 | q | 59.35 | k | 56.44 | f | ----- | z | ----- | z | 34.63 | 22.42 | 28.53 | |||
| 2009 | 23.40 | u | 27.50 | 30.12 | e | 37.70 | 46.77 | 54.93 | 59.84 | 59.29 | 54.33 | 36.48 | 30.87 | 18.06 | 41.45 | |||||||||||
| 2010 | 29.45 | 31.36 | 32.06 | 36.17 | 39.90 | 53.20 | 56.65 | 56.68 | 51.30 | 45.06 | 30.87 | 27.42 | 40.84 | |||||||||||||
| 2011 | 21.52 | 24.41 | a | 32.90 | j | 33.20 | o | 40.71 | g | 46.92 | q | 57.06 | 60.03 | 55.07 | 42.42 | 29.73 | 20.42 | 38.83 | ||||||||
| 2012 | 25.06 | 27.72 | ----- | z | 39.43 | 43.73 | t | 49.03 | 60.42 | 60.32 | 52.60 | 40.55 | 35.43 | 27.97 | a | 41.85 | ||||||||||
| 2013 | 12.42 | 24.93 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.67 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 20.97 | 27.35 | 31.31 | 36.95 | 44.03 | 51.10 | 57.78 | 57.23 | 49.53 | 40.54 | 31.65 | 23.56 | 39.64 | |||||||||||||
| S.D. | 5.83 | 4.87 | 3.23 | 2.48 | 2.79 | 3.00 | 2.92 | 3.15 | 3.25 | 2.56 | 3.50 | 5.07 | 1.42 | |||||||||||||
| SKEW | -0.24 | -1.24 | 0.38 | -0.43 | 0.12 | -0.31 | -0.84 | 0.19 | 0.35 | 0.36 | -1.11 | -1.24 | 0.09 | |||||||||||||
| MAX | 29.65 | 35.21 | 39.61 | 41.63 | 51.74 | 58.27 | 62.87 | 64.33 | 57.77 | 47.97 | 37.03 | 30.35 | 41.92 | |||||||||||||
| MIN | 8.97 | 10.64 | 25.80 | 30.87 | 38.32 | 43.70 | 47.00 | 51.06 | 44.10 | 35.37 | 19.93 | 6.45 | 37.22 | |||||||||||||
| NO YRS | 28 | 31 | 31 | 34 | 43 | 55 | 53 | 56 | 52 | 35 | 31 | 30 | 20 | |||||||||||||