| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.77 | q | 33.19 | 33.19 | ||
| 1955 | 31.58 | 31.36 | 30.94 | 34.23 | 39.23 | 47.73 | 51.26 | 51.90 | 49.07 | 44.55 | 33.76 | a | 33.23 | 39.90 | ||||||||||||
| 1956 | 32.77 | 28.90 | 31.45 | 37.47 | 45.13 | a | 47.63 | 54.84 | 53.29 | 50.40 | 42.39 | 36.20 | 34.42 | 41.24 | ||||||||||||
| 1957 | 25.94 | 32.93 | 35.90 | 39.70 | 47.84 | 51.43 | 52.16 | 52.10 | 52.47 | 44.39 | 35.97 | 35.06 | 42.16 | |||||||||||||
| 1958 | 35.45 | 39.36 | 34.23 | 39.20 | 48.52 | 54.63 | 56.68 | 56.39 | 50.37 | 45.87 | 39.00 | 38.68 | 44.86 | |||||||||||||
| 1959 | 35.61 | 33.82 | 35.42 | 39.07 | 42.39 | 50.63 | 54.16 | 53.23 | 49.63 | 46.00 | 37.60 | 35.42 | 42.75 | |||||||||||||
| 1960 | 30.42 | 33.83 | 34.32 | 38.50 | 42.03 | 49.70 | 54.84 | 51.65 | 50.52 | a | 45.32 | 38.27 | 34.87 | 42.02 | ||||||||||||
| 1961 | 36.32 | 36.57 | 36.48 | 38.27 | 44.81 | 52.83 | 54.06 | 56.97 | 47.73 | 43.39 | 35.37 | 33.77 | 43.05 | |||||||||||||
| 1962 | 30.39 | 33.39 | 32.90 | 39.43 | 41.55 | 48.10 | 52.74 | 53.19 | 51.83 | 45.19 | 39.87 | 36.39 | 42.08 | |||||||||||||
| 1963 | 27.71 | 38.75 | 35.03 | 37.57 | 44.19 | 49.20 | 51.32 | 54.55 | 54.10 | 46.16 | 39.67 | 34.90 | 42.76 | |||||||||||||
| 1964 | 34.10 | 32.07 | 33.97 | 36.73 | 41.32 | 48.50 | 53.42 | 52.81 | 48.33 | 45.06 | 36.37 | 33.39 | 41.34 | |||||||||||||
| 1965 | 33.81 | 34.18 | 34.65 | 40.20 | 41.16 | 48.37 | 54.65 | 55.23 | 47.93 | 47.00 | 42.00 | 32.58 | 42.65 | |||||||||||||
| 1966 | 32.84 | 33.89 | 34.06 | 39.73 | 43.77 | 48.40 | 52.32 | 53.45 | 51.73 | 43.61 | 40.93 | 36.35 | 42.59 | |||||||||||||
| 1967 | 36.42 | 34.32 | 34.68 | 36.00 | 43.35 | 51.60 | 54.71 | 57.00 | 52.80 | 45.39 | 40.83 | 33.35 | 43.37 | |||||||||||||
| 1968 | 31.84 | 38.14 | 37.68 | 37.10 | 43.90 | 50.40 | 55.19 | 55.13 | 52.17 | 43.52 | 39.90 | 32.16 | 43.09 | |||||||||||||
| 1969 | 27.94 | 31.57 | 33.00 | 38.23 | 46.42 | 53.87 | 52.87 | 51.52 | 51.13 | 42.52 | 40.17 | 36.94 | 42.18 | |||||||||||||
| 1970 | 35.10 | 36.39 | 35.77 | 36.17 | 43.32 | 52.80 | 53.68 | 52.26 | 46.43 | 42.61 | 39.67 | 33.29 | 42.29 | |||||||||||||
| 1971 | 30.97 | 33.32 | 32.23 | 36.27 | 43.00 | 47.47 | 54.48 | 56.84 | 48.57 | 41.68 | 37.63 | 32.84 | 41.27 | |||||||||||||
| 1972 | 30.06 | 33.86 | 37.42 | 36.67 | 44.48 | 50.20 | 54.52 | 55.13 | 47.43 | 42.55 | 40.40 | 29.39 | 41.84 | |||||||||||||
| 1973 | 30.45 | 36.82 | 36.13 | 37.93 | 44.90 | 48.73 | 53.10 | 50.94 | 50.27 | 42.90 | 36.31 | a | 37.58 | 42.17 | ||||||||||||
| 1974 | 29.32 | 34.07 | 34.84 | 39.07 | 42.16 | 49.93 | 53.77 | 54.87 | 52.70 | 43.26 | 40.03 | 36.10 | 42.51 | |||||||||||||
| 1975 | 34.45 | 33.14 | 34.55 | 34.77 | 40.97 | 46.30 | 53.45 | 51.26 | 51.00 | 45.52 | 36.97 | 35.29 | 41.47 | |||||||||||||
| 1976 | 33.42 | 32.45 | 32.42 | 37.40 | 42.42 | 45.70 | 51.55 | 52.74 | 51.63 | 44.10 | 41.70 | 35.32 | 41.74 | |||||||||||||
| 1977 | 31.61 | 36.18 | 34.55 | 38.83 | 41.29 | 50.43 | 51.58 | 57.32 | 50.10 | 45.55 | 37.00 | 38.26 | 42.73 | |||||||||||||
| 1978 | 37.68 | 37.04 | 39.77 | 39.37 | 42.48 | 50.97 | 54.06 | 54.39 | 50.80 | 45.84 | 34.07 | 29.81 | 43.02 | |||||||||||||
| 1979 | 26.74 | 32.96 | 37.06 | 39.70 | 44.87 | 48.30 | 53.65 | 54.35 | 53.30 | 47.65 | 37.43 | 38.48 | 42.88 | |||||||||||||
| 1980 | 31.13 | 37.00 | 36.90 | 39.73 | 43.29 | 47.30 | 54.13 | 50.19 | 49.53 | 45.48 | 41.77 | 37.03 | 42.79 | |||||||||||||
| 1981 | 37.35 | 36.29 | 37.26 | 40.00 | 43.45 | 48.53 | 50.94 | 56.06 | 50.60 | 42.13 | 40.07 | 36.29 | 43.25 | |||||||||||||
| 1982 | 32.26 | 32.64 | 34.65 | 35.73 | 42.61 | 50.53 | 52.42 | 54.03 | 50.13 | 45.00 | 36.43 | 35.48 | 41.83 | |||||||||||||
| 1983 | 35.90 | 38.00 | 39.48 | 37.57 | 45.74 | 48.40 | 52.29 | 55.74 | 48.83 | 44.74 | 41.07 | 30.74 | 43.21 | |||||||||||||
| 1984 | 34.29 | 35.00 | 39.13 | 38.40 | 42.10 | 47.67 | 52.03 | 53.19 | 50.37 | 43.84 | 38.27 | 32.10 | 42.20 | |||||||||||||
| 1985 | 32.16 | 30.61 | 33.26 | 40.00 | 43.42 | 48.53 | 55.00 | 52.55 | 47.50 | 43.39 | 31.13 | 30.26 | 40.65 | |||||||||||||
| 1986 | 37.71 | 36.36 | 40.00 | 37.90 | 44.29 | 52.03 | 50.55 | 55.23 | 47.87 | 45.94 | 39.33 | 35.65 | 43.57 | |||||||||||||
| 1987 | 32.39 | 36.07 | 37.68 | 41.20 | 46.77 | 49.97 | 52.29 | 52.77 | 50.90 | 46.23 | 41.07 | a | 33.77 | 43.43 | ||||||||||||
| 1988 | 32.19 | 33.86 | 35.65 | 39.83 | 42.97 | 48.63 | 52.48 | 52.00 | 49.70 | 50.39 | 39.73 | 34.48 | 42.66 | |||||||||||||
| 1989 | 33.90 | 26.54 | 36.00 | 41.53 | 43.32 | 50.00 | 51.42 | 52.16 | 49.63 | 42.74 | ----- | z | 35.03 | 42.03 | ||||||||||||
| 1990 | 35.48 | 30.54 | 36.58 | 41.93 | 43.39 | 49.47 | 55.58 | 55.26 | 53.73 | 42.81 | 39.50 | 27.35 | 42.64 | |||||||||||||
| 1991 | 31.23 | 39.32 | 35.48 | 38.73 | 42.65 | 46.17 | 53.65 | 54.94 | 51.53 | 44.19 | 41.47 | 37.55 | 43.07 | |||||||||||||
| 1992 | 36.65 | 39.52 | 39.97 | 43.23 | 46.97 | 51.47 | 53.71 | 53.97 | 49.63 | 46.84 | 39.70 | 33.13 | 44.56 | |||||||||||||
| 1993 | 29.84 | 31.32 | 38.19 | 40.77 | 47.71 | 48.37 | 50.87 | 53.10 | 49.37 | 46.97 | 33.47 | 35.03 | 42.08 | |||||||||||||
| 1994 | 36.81 | 33.61 | 36.68 | 41.17 | 45.81 | 47.67 | 53.16 | 52.58 | 51.97 | 43.77 | 33.73 | 34.48 | 42.62 | |||||||||||||
| 1995 | 37.39 | 37.75 | 36.06 | 38.97 | 45.61 | 48.30 | 54.81 | 51.52 | 53.70 | 44.90 | 42.50 | 37.16 | 44.06 | |||||||||||||
| 1996 | 35.52 | 32.17 | 36.39 | 40.13 | 42.29 | 47.70 | 54.74 | 53.87 | 48.90 | 44.65 | 38.73 | 34.65 | 42.48 | |||||||||||||
| 1997 | 34.16 | 34.82 | 36.29 | 39.17 | 47.32 | 48.70 | 53.10 | 55.55 | 52.40 | 45.29 | 42.47 | 35.39 | 43.72 | |||||||||||||
| 1998 | 36.52 | 37.00 | 37.81 | 39.47 | 44.84 | 50.17 | 56.26 | 55.10 | 52.93 | 44.71 | 40.60 | 31.90 | 43.94 | |||||||||||||
| 1999 | 34.94 | 34.25 | 34.97 | 36.97 | 41.13 | 48.13 | 51.52 | 55.10 | 48.77 | 44.35 | 42.13 | 35.61 | 42.32 | |||||||||||||
| 2000 | 33.35 | 36.34 | 35.61 | 40.97 | 44.32 | 49.43 | 51.61 | 51.74 | 50.87 | 45.55 | 35.83 | 35.58 | 42.60 | |||||||||||||
| 2001 | 35.35 | 34.29 | 37.35 | 38.17 | 43.55 | 46.60 | 51.39 | 52.45 | 48.59 | a | 41.39 | 37.87 | 33.52 | 41.71 | ||||||||||||
| 2002 | 34.23 | 33.36 | 32.81 | 37.83 | 40.84 | 49.70 | 52.77 | 51.94 | 50.67 | 42.35 | 38.30 | 36.39 | 41.76 | |||||||||||||
| 2003 | 38.03 | 33.25 | 38.45 | 38.13 | 44.23 | 49.97 | 53.06 | 54.32 | 51.97 | 46.94 | 35.33 | 35.65 | 43.28 | |||||||||||||
| 2004 | 32.81 | 35.66 | 37.68 | 40.50 | 46.10 | 49.33 | 54.23 | 56.23 | 50.50 | 45.42 | 38.20 | 36.87 | 43.63 | |||||||||||||
| 2005 | 33.42 | 32.93 | 37.45 | 39.63 | 46.06 | 47.40 | 53.52 | 52.94 | 46.63 | 45.32 | 36.03 | 32.23 | 41.96 | |||||||||||||
| 2006 | 34.87 | 30.89 | 33.23 | 37.53 | 43.48 | 50.20 | 53.58 | 50.35 | 48.20 | 41.42 | 37.10 | 32.35 | 41.10 | |||||||||||||
| 2007 | 28.77 | 33.25 | 35.61 | 37.53 | 42.48 | ----- | z | 52.52 | 50.19 | 46.40 | 40.77 | 35.33 | 32.35 | 39.57 | ||||||||||||
| 2008 | 27.77 | 31.38 | 31.00 | 32.80 | 41.52 | 44.47 | 50.65 | 52.35 | 47.73 | 42.42 | 39.57 | 30.10 | 39.31 | |||||||||||||
| 2009 | 30.84 | 30.68 | 32.77 | 35.73 | 42.26 | 49.43 | 54.35 | ----- | z | 50.37 | 41.87 | 35.60 | 27.84 | 39.25 | ||||||||||||
| 2010 | ----- | z | 35.21 | 33.74 | 35.67 | 39.45 | 46.30 | 51.32 | 50.65 | 49.27 | 42.03 | 35.17 | 33.06 | 41.08 | ||||||||||||
| 2011 | 29.90 | 29.14 | 30.68 | 31.77 | 37.87 | 45.77 | 48.48 | 51.06 | 50.07 | 42.81 | 34.10 | 29.10 | 38.40 | |||||||||||||
| 2012 | 30.42 | 31.69 | 30.32 | 36.17 | 39.26 | 43.33 | 49.84 | 50.65 | 47.37 | 40.65 | 36.57 | 31.58 | 38.99 | |||||||||||||
| 2013 | 26.45 | 31.14 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.80 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.88 | 34.09 | 35.42 | 38.32 | 43.49 | 49.01 | 53.06 | 53.48 | 50.16 | 44.30 | 38.16 | 34.08 | 42.33 | |||||||||||||
| S.D. | 3.11 | 2.77 | 2.40 | 2.17 | 2.26 | 2.15 | 1.63 | 1.93 | 1.93 | 1.90 | 2.67 | 2.60 | 1.25 | |||||||||||||
| SKEW | -0.33 | -0.07 | -0.14 | -0.59 | 0.03 | 0.09 | -0.27 | 0.17 | 0.02 | 0.35 | -0.34 | -0.54 | -1.00 | |||||||||||||
| MAX | 38.03 | 39.52 | 40.00 | 43.23 | 48.52 | 54.63 | 56.68 | 57.32 | 54.10 | 50.39 | 42.50 | 38.68 | 44.86 | |||||||||||||
| MIN | 25.94 | 26.54 | 30.32 | 31.77 | 37.87 | 43.33 | 48.48 | 50.19 | 46.40 | 40.65 | 31.13 | 27.35 | 38.40 | |||||||||||||
| NO YRS | 58 | 59 | 58 | 58 | 58 | 57 | 58 | 57 | 58 | 58 | 57 | 59 | 54 | |||||||||||||