| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.29 | m | 46.35 | 37.50 | 36.39 | 40.08 | ||||
| 1956 | 36.29 | 30.66 | 35.19 | 41.13 | 47.55 | 49.07 | 54.87 | 53.45 | 49.70 | 43.77 | 36.63 | 36.32 | 42.89 | |||||||||||||
| 1957 | 28.03 | 35.93 | 39.77 | 42.67 | 48.48 | 51.57 | 51.52 | 51.19 | 53.43 | 46.29 | 38.33 | 37.13 | 43.70 | |||||||||||||
| 1958 | 36.71 | 43.00 | 37.35 | 41.67 | 49.10 | 53.97 | 57.32 | 55.23 | 50.53 | 46.06 | 41.27 | 41.97 | 46.18 | |||||||||||||
| 1959 | 39.19 | 35.36 | 38.26 | 41.47 | 44.13 | 51.57 | 54.06 | 52.39 | 50.47 | 48.26 | 38.77 | 36.58 | 44.21 | |||||||||||||
| 1960 | 34.26 | 36.86 | 39.97 | 42.03 | 45.23 | 48.87 | 54.32 | 52.00 | 50.03 | 45.97 | 39.90 | 35.45 | 43.74 | |||||||||||||
| 1961 | 37.13 | 40.54 | 39.42 | 41.03 | 46.48 | 52.07 | 54.19 | 55.52 | 48.43 | 44.71 | 35.90 | 36.84 | 44.35 | |||||||||||||
| 1962 | 31.81 | 35.71 | 36.94 | 42.70 | 43.81 | 48.13 | 51.71 | 52.77 | 51.23 | 45.87 | 42.57 | 37.45 | 43.39 | |||||||||||||
| 1963 | 27.61 | 42.57 | 38.87 | 40.70 | 45.48 | 49.70 | 51.35 | 53.29 | 55.13 | 47.52 | 41.70 | ----- | z | 44.90 | ||||||||||||
| 1964 | 36.97 | 34.38 | 37.16 | 38.97 | 42.23 | 49.13 | 52.87 | 52.65 | 48.33 | 46.00 | 38.97 | 36.81 | 42.87 | |||||||||||||
| 1965 | 36.10 | 36.57 | 37.97 | 42.53 | 43.26 | 48.60 | 53.77 | 54.71 | 48.63 | 49.16 | 44.70 | 35.32 | 44.28 | |||||||||||||
| 1966 | 36.39 | 36.11 | 38.03 | 42.23 | 44.35 | 49.23 | 52.61 | 52.10 | 51.70 | 45.32 | 42.63 | 39.32 | 44.17 | |||||||||||||
| 1967 | 38.61 | 36.89 | 37.06 | 37.93 | 44.42 | 52.60 | 53.06 | 55.61 | 51.27 | 47.13 | 40.50 | 35.26 | 44.20 | |||||||||||||
| 1968 | 35.48 | 39.55 | 40.32 | 40.17 | 44.97 | 50.83 | 54.48 | 54.52 | 51.47 | 44.45 | 42.33 | 35.68 | 44.52 | |||||||||||||
| 1969 | 32.94 | 34.79 | 36.65 | 41.43 | 48.00 | 52.83 | 52.81 | 50.16 | 49.47 | 44.19 | 40.37 | 38.97 | a | 43.55 | ||||||||||||
| 1970 | 38.42 | 38.61 | 40.10 | 37.67 | 44.58 | 51.93 | 52.71 | 50.42 | 48.37 | 43.87 | 41.10 | 35.26 | 43.59 | |||||||||||||
| 1971 | 32.77 | 35.93 | 36.19 | 39.40 | 44.42 | 47.50 | 53.68 | 55.06 | 48.10 | 43.26 | 39.13 | 34.61 | 42.51 | |||||||||||||
| 1972 | 33.13 | 36.55 | 40.90 | 38.57 | 45.16 | 49.60 | 54.23 | 54.29 | 47.37 | 43.84 | 42.13 | 31.10 | 43.07 | |||||||||||||
| 1973 | 33.45 | 38.07 | 38.00 | 41.37 | 46.26 | 51.47 | 52.77 | 50.58 | 51.80 | 45.35 | 38.97 | 39.45 | 43.96 | |||||||||||||
| 1974 | 30.74 | 35.04 | 36.48 | f | 39.86 | a | 43.55 | 49.50 | 53.26 | 54.29 | 51.13 | 42.77 | 41.43 | 38.52 | 43.64 | |||||||||||
| 1975 | 37.35 | 36.21 | 35.81 | 37.27 | 46.77 | 47.83 | 54.48 | 52.35 | 49.50 | 46.52 | 39.33 | 37.45 | 43.41 | |||||||||||||
| 1976 | 35.81 | 34.28 | 36.10 | 39.83 | 43.63 | a | 45.73 | 52.65 | 53.58 | 51.23 | 44.65 | 41.63 | 33.42 | 42.71 | ||||||||||||
| 1977 | 30.90 | 37.21 | 36.13 | 40.47 | 42.32 | 49.17 | 49.68 | 55.97 | 48.93 | 44.29 | 38.34 | a | 39.83 | a | 42.77 | |||||||||||
| 1978 | 39.42 | 39.64 | 41.45 | 41.33 | 44.48 | 52.73 | 54.00 | 54.00 | 50.17 | 44.65 | 34.33 | 30.68 | 43.91 | |||||||||||||
| 1979 | 25.19 | 36.04 | 40.03 | 42.57 | 45.19 | 48.60 | 53.19 | 53.00 | 52.37 | 48.13 | a | 39.30 | 39.52 | 43.59 | ||||||||||||
| 1980 | 30.94 | 37.86 | a | 37.68 | 42.47 | 44.55 | 49.33 | 53.77 | a | 50.13 | 48.57 | 45.19 | 41.57 | 37.87 | 43.33 | |||||||||||
| 1981 | 36.45 | 36.46 | 39.10 | 41.37 | 45.48 | 49.83 | 52.32 | 54.35 | 50.00 | a | 43.97 | 41.23 | 38.52 | 44.09 | ||||||||||||
| 1982 | 33.10 | 34.79 | 37.29 | 38.00 | 42.55 | 51.33 | 51.58 | 52.87 | 50.03 | 46.03 | 37.23 | 35.35 | 42.51 | |||||||||||||
| 1983 | 37.74 | 40.14 | 42.23 | 40.37 | 45.97 | 48.73 | 53.52 | 55.16 | 48.03 | 45.84 | 42.17 | 33.97 | 44.49 | |||||||||||||
| 1984 | 35.03 | 37.24 | 41.84 | 40.17 | 43.94 | 47.73 | 51.74 | 53.00 | 48.60 | 44.45 | 39.97 | 32.71 | 43.03 | |||||||||||||
| 1985 | 30.35 | 33.39 | 34.74 | 42.50 | 44.29 | 49.13 | 54.87 | 52.58 | 48.30 | 43.10 | 33.43 | 28.84 | 41.29 | |||||||||||||
| 1986 | 38.06 | 38.04 | 41.58 | 40.23 | 45.26 | 52.60 | 51.42 | 55.26 | 48.97 | 47.39 | 41.37 | 36.32 | 44.71 | |||||||||||||
| 1987 | 33.71 | 37.71 | 40.13 | 43.33 | 48.16 | 50.17 | 53.29 | 52.32 | 50.80 | 44.06 | 41.77 | 35.42 | 44.24 | |||||||||||||
| 1988 | 34.16 | 35.55 | 38.06 | 42.03 | 43.97 | 49.03 | 53.61 | 51.06 | 48.30 | 49.61 | 42.50 | 34.58 | 43.54 | |||||||||||||
| 1989 | 35.45 | 28.46 | 39.06 | 43.87 | 45.77 | 50.50 | 52.74 | 53.23 | 51.67 | 45.16 | 41.27 | 34.26 | 43.45 | |||||||||||||
| 1990 | 36.90 | 33.71 | 39.81 | 44.27 | 44.81 | 50.30 | 56.23 | 55.97 | 52.87 | 44.81 | 40.77 | 28.35 | 44.07 | |||||||||||||
| 1991 | 32.29 | 41.00 | 37.23 | 40.77 | 43.03 | 47.37 | 54.00 | 53.81 | 50.10 | 43.97 | 43.17 | 37.45 | 43.68 | |||||||||||||
| 1992 | 38.52 | 40.69 | 42.42 | 45.57 | 48.19 | 52.80 | 55.13 | 53.81 | 50.97 | 48.00 | 39.77 | 34.77 | 45.89 | |||||||||||||
| 1993 | 30.74 | 33.43 | 41.77 | 43.23 | 48.19 | 49.90 | 51.58 | 53.39 | 50.57 | 48.03 | 34.03 | 34.39 | 43.27 | |||||||||||||
| 1994 | 36.52 | 34.71 | 39.90 | 43.03 | 47.10 | 48.70 | 53.81 | 52.26 | 53.63 | 44.74 | 35.47 | 36.16 | 43.84 | |||||||||||||
| 1995 | 37.32 | 39.79 | 38.97 | 40.93 | 46.16 | 49.67 | 55.29 | 51.13 | 54.00 | 45.52 | 44.27 | 38.90 | 45.16 | |||||||||||||
| 1996 | 37.13 | 35.03 | 39.16 | 44.00 | 44.23 | 48.57 | 55.90 | 53.52 | 49.43 | 46.74 | 41.00 | 37.71 | 44.37 | |||||||||||||
| 1997 | 35.71 | 36.75 | 39.23 | 42.27 | 49.16 | 50.37 | 54.03 | 55.00 | 53.90 | 46.00 | 44.13 | 34.74 | 45.11 | |||||||||||||
| 1998 | 40.00 | 39.89 | 40.03 | 42.30 | 46.39 | 50.40 | 56.52 | 53.48 | 52.07 | 46.39 | 42.63 | 34.29 | 45.37 | |||||||||||||
| 1999 | 37.00 | 37.54 | 36.55 | 39.67 | 42.45 | 48.83 | 51.55 | 55.45 | 48.73 | 43.45 | 43.80 | 36.13 | 43.43 | |||||||||||||
| 2000 | 34.19 | 38.21 | 36.29 | 41.97 | 45.81 | 50.00 | 52.10 | 50.84 | 51.07 | 44.32 | 36.37 | 36.35 | 43.13 | |||||||||||||
| 2001 | 35.48 | 34.11 | 39.00 | 39.17 | 43.90 | 47.47 | 52.26 | 53.68 | 50.50 | 44.84 | 42.37 | 36.00 | 43.23 | |||||||||||||
| 2002 | 35.71 | 36.00 | 35.90 | 40.80 | 43.00 | 49.43 | 53.39 | 50.84 | 50.50 | 43.32 | 39.83 | 38.29 | 43.08 | |||||||||||||
| 2003 | 39.55 | 35.75 | 41.29 | 40.07 | 44.13 | 49.43 | 52.39 | 52.87 | 51.27 | 47.23 | 37.10 | 37.23 | 44.02 | |||||||||||||
| 2004 | 36.16 | 35.45 | 38.06 | 40.83 | 45.23 | 50.93 | 54.42 | 55.35 | 49.63 | 46.52 | 38.33 | 36.87 | 43.98 | |||||||||||||
| 2005 | 35.71 | 33.29 | 39.68 | 41.60 | 47.94 | 49.00 | 54.39 | 52.81 | 47.24 | i | 48.16 | 37.73 | 35.58 | 43.26 | ||||||||||||
| 2006 | 38.65 | 34.79 | 36.81 | 40.83 | 44.94 | 51.77 | 54.71 | 50.97 | 50.07 | 44.26 | 42.13 | 36.77 | 43.89 | |||||||||||||
| 2007 | 33.03 | 38.29 | 41.23 | a | 42.10 | 44.35 | 49.73 | 57.10 | 54.00 | 50.87 | 45.20 | a | 39.57 | 37.19 | 44.39 | |||||||||||
| 2008 | 33.71 | 36.86 | 37.26 | 39.20 | 47.10 | 48.00 | 53.26 | 54.00 | 49.15 | c | 46.48 | 44.43 | 34.90 | 43.70 | ||||||||||||
| 2009 | 34.29 | 36.71 | 37.10 | 40.53 | 45.61 | 51.88 | d | 56.19 | 53.58 | 52.47 | 46.42 | 41.52 | a | 32.32 | 44.05 | |||||||||||
| 2010 | 42.71 | 41.79 | 39.32 | 40.80 | 44.48 | 50.30 | 52.58 | 53.65 | 53.97 | 46.81 | 41.17 | 39.29 | 45.57 | |||||||||||||
| 2011 | 37.97 | 35.07 | 40.19 | 39.17 | 44.25 | c | 49.70 | 53.53 | a | 55.06 | 54.63 | 48.68 | 41.03 | a | 34.13 | a | 44.45 | |||||||||
| 2012 | 36.47 | a | 37.59 | 37.13 | a | 43.63 | 44.45 | 50.04 | c | 53.71 | 54.65 | 49.77 | 46.27 | a | 43.90 | 38.10 | 44.64 | |||||||||
| 2013 | 32.42 | 36.96 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.69 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.14 | 36.72 | 38.64 | 41.16 | 45.24 | 49.92 | 53.55 | 53.32 | 50.58 | 45.68 | 40.26 | 36.02 | 43.86 | |||||||||||||
| S.D. | 3.27 | 2.69 | 1.94 | 1.74 | 1.76 | 1.65 | 1.53 | 1.58 | 1.85 | 1.63 | 2.67 | 2.59 | 0.88 | |||||||||||||
| SKEW | -0.64 | -0.07 | 0.09 | -0.04 | 0.49 | 0.22 | 0.32 | -0.29 | 0.55 | 0.38 | -0.63 | -0.71 | 0.16 | |||||||||||||
| MAX | 42.71 | 43.00 | 42.42 | 45.57 | 49.16 | 53.97 | 57.32 | 55.97 | 55.13 | 49.61 | 44.70 | 41.97 | 46.18 | |||||||||||||
| MIN | 25.19 | 28.46 | 34.74 | 37.27 | 42.23 | 45.73 | 49.68 | 50.13 | 47.37 | 42.77 | 33.43 | 28.35 | 41.29 | |||||||||||||
| NO YRS | 58 | 58 | 56 | 57 | 57 | 57 | 57 | 57 | 56 | 58 | 58 | 57 | 54 | |||||||||||||