| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1952 | ----- | z | 23.10 | s | 28.41 | b | 32.97 | 39.13 | 43.70 | 48.26 | 47.42 | 44.47 | 37.16 | 19.50 | 25.58 | 36.66 | ||||||||||
| 1953 | 34.14 | b | 26.96 | 27.90 | 30.57 | 37.00 | 40.40 | 45.90 | 48.00 | 43.63 | 35.00 | 33.10 | 28.97 | 35.96 | ||||||||||||
| 1954 | 25.65 | 28.32 | 22.90 | b | 31.07 | 37.06 | 41.63 | 44.87 | a | 44.61 | 40.33 | 30.58 | 30.63 | 18.43 | a | 33.01 | ||||||||||
| 1955 | 18.97 | 21.29 | 22.23 | 28.60 | 35.19 | 43.07 | 45.87 | 44.13 | 41.80 | 34.52 | 25.20 | 24.94 | 32.15 | |||||||||||||
| 1956 | 25.61 | 22.76 | 29.45 | 32.93 | 41.77 | 43.00 | 48.61 | 46.55 | 42.50 | 34.35 | 25.20 | 24.61 | 34.78 | |||||||||||||
| 1957 | 7.39 | 25.79 | 31.16 | 34.23 | 41.23 | 45.13 | 44.61 | 43.84 | 41.69 | a | 35.16 | 23.37 | 27.87 | 33.46 | ||||||||||||
| 1958 | 27.03 | 34.25 | 27.35 | 33.00 | 40.00 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.41 | |||||
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.33 | 48.32 | 48.61 | 42.20 | 33.55 | 32.39 | b | 28.71 | 40.02 | |||||||
| 1975 | 28.59 | b | 24.46 | 27.77 | 27.33 | 35.10 | 41.43 | 50.74 | 46.35 | 40.90 | 36.13 | 28.17 | 28.06 | 34.59 | ||||||||||||
| 1976 | 24.90 | 23.55 | 25.45 | 30.30 | 37.39 | 39.87 | 49.45 | 49.65 | 43.87 | 31.93 | a | 32.23 | 20.48 | 34.09 | ||||||||||||
| 1977 | 17.35 | 25.61 | 26.06 | 32.47 | 35.58 | 47.17 | 48.48 | 53.58 | 41.40 | 34.42 | 25.90 | 28.81 | 34.74 | |||||||||||||
| 1978 | 26.68 | 30.18 | 30.84 | 33.40 | 35.94 | 45.37 | 49.58 | 48.55 | 41.30 | 32.35 | 18.53 | 19.26 | 34.33 | |||||||||||||
| 1979 | 6.63 | a | 26.79 | 29.74 | 33.83 | 39.26 | 45.10 | 49.84 | 49.13 | 44.90 | 39.26 | 28.20 | 28.74 | 35.12 | ||||||||||||
| 1980 | 18.84 | 28.62 | 28.74 | 34.43 | 39.16 | 43.20 | 49.48 | 44.77 | 42.97 | 34.94 | 30.87 | 28.68 | 35.39 | |||||||||||||
| 1981 | 28.16 | 25.54 | 29.58 | 33.27 | 38.55 | 44.17 | 47.29 | 50.84 | 43.97 | 34.23 | 30.73 | 27.26 | 36.13 | |||||||||||||
| 1982 | 22.06 | 25.86 | 27.71 | 28.97 | 36.35 | 47.33 | 49.90 | 49.06 | 42.33 | 33.87 | 25.93 | 26.35 | 34.65 | |||||||||||||
| 1983 | 29.45 | 32.50 | 34.06 | 32.33 | 39.74 | 43.17 | 47.00 | 50.84 | 39.10 | 35.03 | 33.50 | 16.97 | 36.14 | |||||||||||||
| 1984 | 24.26 | 27.90 | 31.84 | 32.43 | 37.29 | 42.07 | 48.97 | 49.19 | 40.73 | 34.29 | 30.57 | 22.03 | 35.13 | |||||||||||||
| 1985 | 21.19 | 22.36 | 26.13 | 35.20 | 37.77 | 44.43 | 52.81 | 47.13 | 38.83 | 33.65 | 18.77 | 14.23 | 32.71 | |||||||||||||
| 1986 | 27.55 | 28.71 | 34.13 | 31.07 | 38.87 | 49.23 | 46.68 | 52.06 | 41.40 | 36.13 | 32.87 | 26.74 | 37.12 | |||||||||||||
| 1987 | 22.58 | 28.57 | 30.71 | 36.23 | 42.81 | 46.10 | 49.65 | 47.81 | 44.50 | 35.84 | 29.60 | 25.30 | a | 36.64 | ||||||||||||
| 1988 | 23.94 | 25.69 | 28.45 | 35.47 | 38.06 | 46.03 | 50.13 | 47.13 | 42.67 | 41.55 | 33.40 | 23.39 | 36.33 | |||||||||||||
| 1989 | 27.87 | 16.32 | 30.45 | 37.20 | 39.19 | 46.27 | 47.29 | 46.90 | 42.90 | 35.45 | 29.33 | 22.06 | 35.10 | |||||||||||||
| 1990 | 28.90 | 24.71 | 29.77 | 37.27 | 37.94 | 46.60 | 52.10 | 52.48 | 46.87 | 34.32 | 30.83 | 15.74 | 36.46 | |||||||||||||
| 1991 | 22.74 | 32.11 | 29.13 | 31.80 | 37.10 | 43.50 | 51.35 | 53.35 | 45.20 | 35.77 | 32.77 | 29.00 | 36.99 | |||||||||||||
| 1992 | 29.61 | 32.93 | 31.94 | 37.00 | 42.32 | 49.07 | 50.32 | 50.39 | 42.97 | 37.81 | 30.33 | 22.94 | 38.14 | |||||||||||||
| 1993 | 14.84 | 18.86 | 31.97 | 34.13 | 43.19 | 45.17 | 45.26 | 47.58 | 43.30 | 38.23 | 18.83 | a | 26.81 | 34.01 | ||||||||||||
| 1994 | 27.90 | 23.93 | 30.61 | 35.67 | 41.61 | 44.60 | 51.48 | 49.00 | 47.57 | 34.39 | 26.43 | 25.61 | 36.57 | |||||||||||||
| 1995 | 27.19 | 31.00 | 29.65 | 31.87 | 40.90 | 45.60 | 51.94 | 46.61 | 46.20 | 33.74 | 35.10 | 26.19 | 37.17 | |||||||||||||
| 1996 | 27.39 | 22.66 | 30.16 | 36.43 | 37.03 | 43.13 | 53.29 | 50.61 | 42.00 | 36.68 | 29.90 | 26.81 | 36.34 | |||||||||||||
| 1997 | 23.97 | 27.79 | 30.32 | 33.00 | 43.19 | 43.87 | 50.16 | 52.61 | 46.50 | 36.45 | 33.37 | 23.74 | 37.08 | |||||||||||||
| 1998 | 26.94 | 31.04 | 31.35 | 33.63 | 40.97 | 46.13 | 55.06 | 51.03 | 48.03 | 34.94 | 34.40 | 24.87 | 38.20 | |||||||||||||
| 1999 | 28.71 | 30.21 | 29.03 | 30.00 | 35.39 | 44.17 | 48.13 | 52.74 | 41.50 | 35.84 | 36.00 | 28.84 | 36.71 | |||||||||||||
| 2000 | 24.52 | 30.45 | 28.77 | 34.90 | 41.16 | 45.97 | 49.52 | 49.06 | 44.27 | 38.26 | 26.37 | 24.97 | 36.52 | |||||||||||||
| 2001 | 24.97 | 25.79 | 30.26 | 32.43 | 41.32 | 45.37 | 50.26 | 52.06 | 47.17 | 36.55 | 32.80 | 26.19 | 37.10 | |||||||||||||
| 2002 | 26.68 | 26.29 | 25.84 | 33.13 | 38.32 | 48.47 | 51.97 | 48.32 | 44.67 | 31.84 | 28.97 | 29.74 | 36.19 | |||||||||||||
| 2003 | 32.77 | 26.89 | 34.42 | 33.57 | 40.90 | 48.03 | 52.77 | 52.23 | 46.93 | 40.65 | 27.13 | 27.61 | 38.66 | |||||||||||||
| 2004 | 21.77 | 28.38 | 32.52 | 34.17 | 41.48 | 47.33 | 52.94 | 55.26 | 43.43 | 38.48 | 28.80 | 29.13 | 37.81 | |||||||||||||
| 2005 | 26.39 | 24.93 | 32.03 | 33.83 | 44.03 | 44.27 | 52.58 | 51.65 | 42.20 | 39.08 | e | 29.50 | 19.68 | 36.68 | ||||||||||||
| 2006 | 31.84 | 23.11 | 29.90 | 35.27 | 42.00 | 49.17 | 54.10 | 49.87 | 43.83 | 33.77 | 31.57 | 24.52 | 37.41 | |||||||||||||
| 2007 | 21.55 | 28.32 | 31.68 | 32.03 | 40.19 | 46.00 | 55.00 | 50.16 | 43.07 | 36.16 | 29.73 | 26.13 | 36.67 | |||||||||||||
| 2008 | 21.03 | 28.41 | 26.81 | 29.37 | 41.45 | 42.97 | 51.77 | 52.35 | 43.27 | 36.74 | 34.25 | j | 17.15 | k | 37.42 | |||||||||||
| 2009 | 24.23 | 26.67 | p | 25.91 | i | 32.55 | h | 38.90 | k | 48.37 | 50.86 | x | ----- | z | ----- | z | 35.40 | p | 28.24 | e | 18.19 | 29.76 | ||||
| 2010 | 31.19 | 28.79 | 25.77 | 29.93 | 35.77 | 41.73 | 47.94 | 47.06 | 44.03 | 37.81 | 29.53 | 25.52 | 35.42 | |||||||||||||
| 2011 | 26.50 | e | 22.65 | e | 30.04 | f | 28.20 | e | 33.69 | e | 41.30 | c | 45.54 | e | 49.04 | g | 44.54 | d | 35.48 | j | 26.50 | h | 19.45 | k | 34.63 | |
| 2012 | 24.41 | n | 25.71 | o | 26.19 | o | 33.33 | r | 36.25 | k | 41.94 | m | 49.54 | e | 48.21 | l | 42.30 | g | 35.28 | f | 30.64 | e | 24.96 | h | 40.09 | |
| 2013 | 18.81 | j | 24.22 | j | 28.24 | f | 35.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 10.00 | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 24.66 | 26.70 | 29.36 | 32.91 | 39.11 | 44.89 | 49.70 | 49.30 | 43.39 | 35.64 | 29.05 | 24.75 | 35.84 | |||||||||||||
| S.D. | 5.62 | 3.76 | 2.73 | 2.47 | 2.63 | 2.39 | 2.69 | 2.75 | 2.18 | 2.31 | 4.34 | 3.98 | 1.55 | |||||||||||||
| SKEW | -1.38 | -0.36 | -0.50 | -0.26 | -0.06 | -0.04 | 0.00 | -0.04 | 0.22 | 0.36 | -0.97 | -0.98 | -0.47 | |||||||||||||
| MAX | 34.14 | 34.25 | 34.42 | 37.27 | 44.03 | 49.23 | 55.06 | 55.26 | 48.03 | 41.55 | 36.00 | 29.74 | 38.66 | |||||||||||||
| MIN | 6.63 | 16.32 | 22.23 | 27.33 | 33.69 | 39.87 | 44.61 | 43.84 | 38.83 | 30.58 | 18.53 | 14.23 | 32.15 | |||||||||||||
| NO YRS | 43 | 42 | 42 | 43 | 42 | 44 | 44 | 42 | 43 | 42 | 43 | 42 | 39 | |||||||||||||