| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.57 | h | 9999.00 | |
| 1951 | 16.32 | 25.46 | 23.03 | 27.80 | 37.65 | 40.07 | 49.67 | a | 47.65 | 37.77 | 30.58 | 20.90 | 15.26 | 31.01 | ||||||||||||
| 1952 | 7.45 | 20.03 | 24.74 | ----- | z | 40.58 | 46.40 | 53.08 | g | 48.70 | a | 38.97 | 26.77 | 10.69 | d | 19.91 | h | 29.37 | ||||||||
| 1953 | 29.04 | c | 24.00 | c | 24.10 | j | 29.18 | b | 35.32 | l | 43.14 | b | 49.60 | a | 48.84 | f | 39.50 | l | 30.74 | l | 33.00 | z | 18.62 | w | 34.99 | |
| 1954 | 25.53 | a | 28.17 | d | 20.88 | n | 33.04 | b | 39.67 | d | 45.92 | f | 51.54 | c | 46.68 | 36.86 | a | 27.74 | d | 24.00 | d | 15.46 | c | 32.87 | ||
| 1955 | 14.63 | a | 16.00 | b | 23.21 | c | 29.85 | d | 38.87 | a | 46.10 | 47.41 | i | 42.68 | c | 36.63 | c | 26.00 | i | 19.31 | d | 23.63 | a | 29.09 | ||
| 1956 | 21.96 | e | 14.30 | b | 24.46 | g | 27.71 | b | 29.33 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.31 | e | 20.07 | |
| 1957 | 9.43 | a | 24.71 | 29.34 | b | ----- | z | ----- | z | ----- | z | ----- | z | 46.64 | c | 40.12 | f | 34.70 | d | 21.07 | a | 21.79 | l | 27.65 | ||
| 1958 | ----- | z | ----- | z | ----- | z | 29.32 | e | 42.62 | e | 47.91 | g | 50.78 | d | 53.00 | i | 38.50 | b | 28.67 | a | 29.87 | o | 24.35 | h | 37.98 | |
| 1959 | 21.72 | b | 19.50 | 19.63 | a | 30.57 | 34.50 | e | 47.30 | 50.19 | 46.16 | 44.00 | l | 32.35 | 15.33 | 8.55 | 29.62 | |||||||||
| 1960 | 11.20 | a | 21.96 | a | 27.84 | 31.15 | d | 36.61 | 43.86 | b | 53.35 | 43.07 | d | 37.79 | b | ----- | z | 24.61 | b | 13.11 | c | 31.32 | ||||
| 1961 | 14.94 | 27.67 | a | 27.11 | c | 27.68 | b | 35.32 | c | 47.62 | a | 48.97 | 54.14 | c | 37.27 | 30.65 | 18.07 | a | 20.38 | b | 32.48 | |||||
| 1962 | ----- | z | 23.72 | c | 24.04 | d | ----- | z | 39.77 | a | 44.61 | b | 47.70 | a | 45.76 | b | 38.93 | 31.74 | 27.40 | 21.03 | 34.47 | |||||
| 1963 | 10.32 | 28.71 | 24.81 | 27.50 | 40.41 | b | 44.93 | 47.65 | 46.77 | 44.50 | 34.45 | 28.27 | 19.43 | a | 33.15 | |||||||||||
| 1964 | 18.52 | 19.03 | ----- | z | 28.50 | ----- | z | 46.59 | a | 51.55 | 46.52 | 35.63 | 29.77 | 22.53 | 25.16 | 32.38 | ||||||||||
| 1965 | 21.87 | 22.86 | 20.30 | a | 35.23 | 36.40 | a | 45.24 | a | 48.61 | 48.71 | 34.83 | 29.94 | 27.90 | a | 15.37 | a | 32.27 | ||||||||
| 1966 | 20.29 | 20.32 | 24.13 | a | 27.27 | 40.14 | c | 45.47 | 49.19 | 49.12 | o | ----- | z | 26.00 | c | 29.13 | 22.19 | 30.41 | ||||||||
| 1967 | 24.10 | 23.33 | a | 24.87 | 28.25 | b | 36.00 | a | 46.28 | a | 54.45 | 51.30 | a | 41.38 | i | 30.13 | a | 26.14 | a | 16.06 | 32.81 | |||||
| 1968 | 15.42 | 27.17 | ----- | z | 26.00 | b | 38.84 | 45.90 | 52.19 | 46.93 | a | 39.83 | ----- | z | 29.00 | a | 20.29 | c | 34.16 | |||||||
| 1969 | 22.38 | b | 24.32 | 24.17 | b | 31.28 | a | 41.52 | 46.48 | a | 50.77 | 46.03 | a | 39.17 | 27.84 | 16.60 | 20.41 | d | 32.58 | |||||||
| 1970 | 22.84 | 23.07 | a | 23.83 | a | 24.37 | 35.81 | 49.10 | 50.84 | 46.40 | a | 35.00 | b | 26.10 | 26.90 | 17.32 | f | 33.11 | ||||||||
| 1971 | 22.97 | a | 20.29 | 20.13 | 25.85 | c | 36.87 | 43.20 | j | 49.90 | a | 49.13 | 32.50 | 30.03 | 22.58 | d | 16.73 | a | 29.73 | |||||||
| 1972 | 15.64 | c | 21.76 | 25.55 | 24.83 | 37.00 | 45.07 | 47.61 | 48.53 | a | 34.70 | 33.13 | a | 26.76 | a | 13.69 | b | 31.19 | ||||||||
| 1973 | 17.19 | 24.61 | 25.74 | 27.86 | a | 37.87 | a | ----- | z | 52.81 | 46.29 | 38.48 | a | 30.38 | b | ----- | z | 27.03 | a | 32.83 | ||||||
| 1974 | 16.31 | b | 22.00 | 26.10 | 29.86 | a | 37.39 | 47.45 | a | 52.03 | 48.10 | 36.07 | 28.68 | 24.77 | 21.71 | 32.54 | ||||||||||
| 1975 | 14.74 | 25.58 | b | 27.86 | c | 27.55 | a | 34.77 | 44.41 | a | 58.00 | 47.68 | 36.39 | g | 31.48 | 22.79 | a | 26.14 | c | 32.82 | ||||||
| 1976 | 22.03 | 20.90 | 19.87 | 29.18 | b | 37.62 | b | 43.71 | b | 53.16 | 47.06 | 42.77 | 26.57 | a | 19.97 | 6.74 | 30.80 | |||||||||
| 1977 | 6.61 | 18.26 | a | 20.10 | 30.43 | 38.47 | a | 51.79 | a | 52.03 | 52.81 | 41.77 | 31.03 | a | 25.70 | 28.13 | 33.09 | |||||||||
| 1978 | 25.77 | a | 28.50 | 32.60 | a | 34.23 | ----- | z | 43.97 | 52.19 | 49.68 | 38.57 | 27.45 | 18.47 | 14.42 | 33.26 | ||||||||||
| 1979 | 7.32 | 25.04 | 27.55 | 30.72 | a | 39.47 | a | 46.79 | a | 52.10 | a | 51.26 | 41.70 | 34.57 | a | 19.37 | 19.48 | 32.95 | ||||||||
| 1980 | 21.71 | 28.14 | 24.71 | 33.47 | 41.38 | b | 43.37 | 53.29 | 46.65 | 42.59 | a | 31.17 | a | 24.34 | a | 17.54 | c | 34.03 | ||||||||
| 1981 | 25.55 | b | 23.36 | 24.81 | d | 32.93 | 38.84 | 46.10 | a | 48.68 | 48.58 | 40.00 | 30.39 | 27.37 | 26.06 | 34.39 | ||||||||||
| 1982 | 16.94 | 20.93 | 26.74 | 27.00 | 35.74 | 47.10 | 51.74 | 48.68 | 39.57 | 31.23 | 19.47 | 20.90 | 32.17 | |||||||||||||
| 1983 | 23.97 | 29.96 | 29.81 | 29.07 | 37.35 | 43.57 | 47.23 | 52.13 | 38.40 | 32.84 | 30.10 | 18.71 | 34.43 | |||||||||||||
| 1984 | 7.03 | b | 17.90 | 31.68 | 29.70 | 40.77 | 43.07 | 53.65 | 49.35 | 37.00 | 30.48 | 27.10 | 12.03 | 31.65 | ||||||||||||
| 1985 | 9.93 | a | 14.79 | 21.23 | 31.73 | 40.52 | 45.23 | 55.65 | 46.55 | ----- | z | 27.45 | 18.20 | 4.13 | a | 28.67 | ||||||||||
| 1986 | 19.77 | 32.93 | 32.48 | 32.63 | 39.16 | 49.53 | 49.60 | a | 51.90 | 40.20 | 27.61 | 24.80 | 17.13 | 34.81 | ||||||||||||
| 1987 | 15.87 | 24.75 | 24.95 | k | 33.30 | 43.80 | a | 49.83 | 49.84 | 46.52 | 38.17 | 28.42 | 23.72 | a | 17.03 | a | 33.75 | |||||||||
| 1988 | 17.29 | 23.07 | 26.13 | 35.30 | 39.94 | 51.50 | 53.35 | 46.84 | 38.50 | 34.35 | 28.83 | 19.32 | 34.54 | |||||||||||||
| 1989 | 16.03 | 16.57 | 33.19 | 34.33 | 38.23 | 46.97 | 50.05 | k | 48.65 | 39.57 | 31.55 | 19.67 | 13.52 | 30.75 | ||||||||||||
| 1990 | 18.58 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.73 | 8.32 | 16.55 | ||||
| 1991 | 12.10 | 26.36 | ----- | z | 32.90 | 39.52 | 43.70 | 51.55 | 51.81 | 42.17 | 30.55 | 29.00 | 18.19 | 34.35 | ||||||||||||
| 1992 | 22.13 | 25.69 | 25.97 | 32.23 | 41.45 | 48.03 | 50.19 | 49.97 | 39.63 | 32.35 | 24.33 | 18.39 | 34.20 | |||||||||||||
| 1993 | 9.35 | 16.64 | 30.65 | 33.20 | 41.19 | 43.23 | 46.39 | 44.39 | 38.20 | 32.42 | 11.43 | 20.35 | 30.62 | |||||||||||||
| 1994 | 19.65 | 18.25 | 25.87 | 35.40 | 42.13 | 45.17 | 52.32 | 50.03 | 39.67 | 30.13 | 21.37 | 16.74 | 33.06 | |||||||||||||
| 1995 | 26.29 | 27.32 | 25.84 | 28.87 | 40.10 | 44.17 | 49.23 | 42.58 | 40.97 | 28.55 | 29.00 | 25.00 | 33.99 | |||||||||||||
| 1996 | 24.00 | 22.03 | 26.84 | 31.93 | 38.42 | 44.60 | 50.43 | x | 45.90 | 39.33 | 32.39 | 28.03 | 25.29 | 32.62 | ||||||||||||
| 1997 | 22.10 | 24.43 | 26.06 | 30.07 | 39.16 | 46.40 | 50.90 | 48.81 | 42.40 | 29.10 | 25.73 | ----- | z | 35.01 | ||||||||||||
| 1998 | ----- | z | 24.43 | 28.35 | 34.00 | 40.61 | 43.23 | 55.32 | 50.29 | 47.00 | 29.42 | 31.60 | 16.84 | 36.46 | ||||||||||||
| 1999 | 20.97 | 28.37 | a | 27.84 | 31.20 | 38.38 | b | 47.30 | 49.06 | 49.71 | 36.17 | 27.39 | 26.03 | a | 18.03 | 33.37 | ||||||||||
| 2000 | 24.29 | 28.24 | d | 27.06 | 38.19 | c | 43.65 | 46.13 | 53.45 | 49.06 | 40.07 | 32.80 | a | 21.33 | 22.23 | 35.54 | ||||||||||
| 2001 | 16.23 | 22.59 | a | 31.90 | 32.14 | a | 40.35 | 45.23 | 51.52 | 51.26 | 41.10 | 32.90 | 25.30 | 22.80 | a | 34.44 | ||||||||||
| 2002 | 22.58 | 21.75 | 25.32 | 32.50 | 38.97 | 47.97 | 54.35 | 45.13 | 38.53 | 22.52 | 19.03 | 24.35 | 32.75 | |||||||||||||
| 2003 | 28.71 | 21.14 | 32.00 | 31.83 | 41.55 | 46.53 | 55.16 | 51.48 | 40.53 | 34.13 | 22.23 | 26.48 | 35.98 | |||||||||||||
| 2004 | 20.71 | 25.24 | 28.29 | 32.90 | 40.16 | 48.30 | 52.84 | 51.42 | 39.67 | 34.13 | 26.43 | 23.13 | 35.27 | |||||||||||||
| 2005 | 22.71 | 22.11 | 27.65 | 32.70 | 41.19 | 42.43 | 51.45 | 49.48 | 37.27 | 31.21 | g | 23.23 | 19.84 | 33.64 | ||||||||||||
| 2006 | 25.77 | 19.46 | 25.61 | 32.53 | 38.23 | 48.97 | 55.48 | 46.35 | 37.47 | 27.55 | 26.20 | 14.35 | e | 33.16 | ||||||||||||
| 2007 | 7.44 | f | 23.68 | 29.26 | 33.50 | 41.35 | 48.07 | 56.71 | 51.42 | 39.60 | 33.23 | 23.60 | 18.10 | 36.23 | ||||||||||||
| 2008 | 17.61 | 24.21 | j | 25.00 | 27.10 | 40.58 | 43.90 | 52.16 | 50.42 | 38.20 | 28.68 | 27.97 | 15.68 | 33.39 | ||||||||||||
| 2009 | 23.32 | 22.11 | 26.03 | 31.60 | 44.42 | 50.07 | 53.35 | 51.79 | l | 44.20 | 30.68 | 22.57 | 12.61 | 32.81 | ||||||||||||
| 2010 | 29.39 | 27.89 | 28.39 | 31.70 | 38.06 | 46.60 | 52.77 | 48.55 | 38.90 | 36.90 | 23.80 | 22.87 | 35.49 | |||||||||||||
| 2011 | 17.90 | 21.00 | 28.03 | 28.67 | 33.45 | 41.71 | b | 47.86 | c | 47.35 | 38.97 | 31.20 | a | ----- | z | 8.87 | 31.37 | |||||||||
| 2012 | 17.35 | 18.55 | 25.43 | a | 31.17 | a | 34.55 | 42.00 | 51.90 | b | 46.10 | 36.83 | 26.42 | 25.60 | 18.35 | 31.19 | ||||||||||
| 2013 | 2.55 | 19.93 | 23.53 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 15.34 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 18.56 | 23.01 | 26.26 | 30.71 | 39.06 | 45.86 | 51.53 | 48.25 | 39.04 | 30.36 | 23.66 | 18.39 | 33.24 | |||||||||||||
| S.D. | 6.17 | 3.95 | 3.32 | 2.88 | 2.43 | 2.44 | 2.52 | 2.54 | 2.62 | 2.77 | 4.42 | 5.32 | 1.50 | |||||||||||||
| SKEW | -0.52 | -0.03 | 0.04 | -0.03 | -0.15 | 0.23 | 0.20 | -0.04 | 0.40 | -0.16 | -0.79 | -0.44 | -0.03 | |||||||||||||
| MAX | 29.39 | 32.93 | 33.19 | 38.19 | 44.42 | 51.79 | 58.00 | 54.14 | 47.00 | 36.90 | 31.60 | 28.13 | 35.98 | |||||||||||||
| MIN | 2.55 | 14.30 | 19.63 | 24.37 | 33.45 | 40.07 | 46.39 | 42.58 | 32.50 | 22.52 | 10.69 | 4.13 | 30.62 | |||||||||||||
| NO YRS | 59 | 60 | 54 | 58 | 56 | 55 | 55 | 56 | 53 | 55 | 57 | 56 | 30 | |||||||||||||