| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.16 | f | 40.03 | 29.10 | 34.57 | |||
| 1973 | 31.45 | 35.75 | 36.93 | c | 37.27 | 43.26 | 48.00 | 52.84 | 47.94 | 49.93 | 42.71 | ----- | z | 38.77 | 42.26 | |||||||||||
| 1974 | 30.10 | 35.11 | 36.03 | 40.55 | a | 42.63 | a | 49.10 | a | 52.32 | 51.90 | 50.27 | 38.61 | 37.77 | 36.81 | 41.77 | ||||||||||
| 1975 | 34.84 | 33.07 | 35.61 | 35.33 | 43.61 | 47.90 | a | 53.42 | 50.34 | b | 48.53 | 44.97 | 36.70 | 35.55 | 41.66 | |||||||||||
| 1976 | 34.23 | 32.66 | 33.97 | 37.90 | 43.55 | 46.40 | 52.10 | 53.13 | 50.77 | 40.35 | 36.50 | 32.10 | 41.14 | |||||||||||||
| 1977 | 26.71 | 33.43 | 34.55 | 39.17 | 42.39 | 48.31 | a | 50.97 | 55.71 | 48.77 | 41.35 | 35.93 | 37.87 | 41.26 | ||||||||||||
| 1978 | 37.10 | 39.00 | 37.71 | 40.60 | 43.19 | 51.93 | 53.68 | 53.90 | 49.48 | a | 40.55 | 29.97 | 28.32 | 42.12 | ||||||||||||
| 1979 | 24.61 | 34.57 | 38.87 | 40.83 | 45.68 | 48.70 | 53.13 | 52.87 | 52.43 | 46.03 | a | 36.60 | 37.90 | a | 42.69 | |||||||||||
| 1980 | 28.81 | 35.86 | a | 36.73 | a | 41.57 | 44.03 | a | 48.77 | 51.77 | 49.06 | 47.57 | 40.52 | 39.53 | 34.83 | a | 41.59 | |||||||||
| 1981 | 34.90 | 33.70 | a | 36.81 | 40.63 | 45.39 | 49.17 | 52.13 | 53.71 | 47.53 | 39.39 | 36.31 | a | 34.70 | a | 42.03 | ||||||||||
| 1982 | 31.32 | 34.14 | 34.58 | 35.97 | 42.32 | 51.40 | 51.94 | 52.45 | 47.00 | 39.84 | 32.73 | 31.97 | 40.47 | |||||||||||||
| 1983 | 33.50 | a | 39.93 | 41.10 | 39.73 | 46.32 | 49.87 | 53.13 | 53.97 | 45.50 | 39.74 | 41.20 | 30.23 | 42.85 | ||||||||||||
| 1984 | 35.35 | 35.59 | 39.58 | 40.10 | 43.48 | 47.57 | 51.35 | 51.58 | 48.73 | 42.00 | 37.77 | 31.03 | 42.01 | |||||||||||||
| 1985 | 26.81 | 30.86 | 34.00 | 41.27 | ----- | z | ----- | z | 55.55 | 51.90 | 47.30 | 40.90 | 29.83 | 26.84 | 38.53 | |||||||||||
| 1986 | 36.55 | 36.11 | 40.97 | 39.27 | 45.19 | 52.87 | 52.29 | 54.87 | 48.60 | 44.90 | 40.17 | 34.42 | 43.85 | |||||||||||||
| 1987 | 33.48 | 37.07 | 38.65 | 41.57 | 47.45 | 50.97 | 54.03 | 53.61 | 50.57 | 43.61 | 39.60 | 33.74 | 43.70 | |||||||||||||
| 1988 | 32.74 | 35.66 | 36.19 | 41.07 | 44.55 | 49.60 | 53.00 | 52.42 | 47.70 | 48.45 | 40.40 | 33.42 | 42.93 | |||||||||||||
| 1989 | 35.29 | 27.79 | 37.65 | 43.60 | 46.13 | 52.43 | 53.16 | 52.58 | 49.13 | 43.32 | 38.90 | a | 33.87 | 42.82 | ||||||||||||
| 1990 | 36.32 | 34.04 | 39.00 | 42.83 | 45.45 | 52.40 | 56.23 | 55.77 | 53.24 | a | 41.61 | 38.67 | 27.26 | 43.57 | ||||||||||||
| 1991 | 32.10 | 38.54 | 35.06 | ----- | z | 43.55 | 48.10 | 53.52 | 54.32 | 51.13 | 41.90 | 40.03 | 35.81 | 43.10 | ||||||||||||
| 1992 | ----- | z | 39.38 | 39.45 | 43.10 | 47.10 | 52.87 | 56.81 | 54.32 | 47.87 | 45.81 | 39.50 | 33.52 | 45.43 | ||||||||||||
| 1993 | 31.39 | 32.43 | 40.42 | 42.60 | 49.77 | 51.10 | 52.71 | 55.65 | 48.93 | 45.90 | 30.63 | 33.81 | 42.95 | |||||||||||||
| 1994 | 37.48 | 32.71 | 39.19 | 42.37 | 47.81 | 49.57 | 54.03 | 53.61 | 52.57 | 40.23 | 33.67 | 36.23 | 43.29 | |||||||||||||
| 1995 | 38.58 | 36.79 | 37.61 | 39.07 | 47.68 | 51.37 | 56.81 | 52.45 | 54.30 | 44.10 | 44.43 | 37.35 | 45.04 | |||||||||||||
| 1996 | 35.94 | 33.31 | 37.68 | 42.93 | 44.45 | 50.07 | 56.84 | 54.39 | 48.23 | 43.61 | 37.67 | 35.29 | 43.37 | |||||||||||||
| 1997 | 36.00 | 35.46 | 36.55 | 39.03 | 50.13 | 50.73 | 54.55 | 59.75 | z | ----- | z | 48.50 | z | 42.67 | 34.90 | 42.23 | ||||||||||
| 1998 | 38.10 | 38.68 | 39.71 | 42.07 | a | 48.13 | 51.83 | 58.55 | 55.32 | 51.60 | 44.42 | 43.03 | 34.16 | 45.47 | ||||||||||||
| 1999 | 35.43 | a | 37.00 | 36.55 | 38.69 | a | 42.86 | c | 50.79 | a | 52.85 | d | 56.90 | 47.26 | c | 43.33 | a | 42.77 | 37.97 | a | 43.53 | |||||
| 2000 | 34.12 | e | 36.73 | c | 34.81 | 41.54 | b | 46.53 | a | 51.52 | a | 53.66 | b | 52.65 | 50.96 | b | 44.55 | 35.40 | 35.23 | a | 43.14 | |||||
| 2001 | 34.39 | 32.52 | a | 37.45 | b | 37.79 | a | 43.00 | e | 45.93 | c | 52.40 | a | 52.59 | b | 49.17 | a | 41.87 | a | 41.83 | 36.23 | a | 42.10 | |||
| 2002 | 34.90 | 34.75 | 35.97 | 40.63 | 42.90 | 49.69 | a | 53.58 | 51.16 | 48.22 | g | 42.13 | 38.67 | 36.45 | 41.89 | |||||||||||
| 2003 | 39.94 | 35.79 | 39.48 | 40.32 | e | 45.15 | e | 50.42 | d | ----- | z | 53.24 | j | 49.17 | g | 48.64 | i | 35.04 | e | 35.70 | k | 40.88 | ||||
| 2004 | 30.85 | k | 37.21 | e | 39.56 | d | 41.46 | d | 47.29 | g | 52.48 | i | 54.95 | l | 55.78 | m | ----- | z | 45.84 | l | ----- | z | 35.22 | h | 39.41 | |
| 2005 | 33.50 | g | 32.59 | f | 37.74 | d | 41.72 | e | 47.38 | g | 49.77 | 54.94 | 53.19 | 45.40 | 46.22 | d | 35.27 | 31.00 | e | 43.92 | ||||||
| 2006 | 38.10 | 31.54 | d | 35.00 | c | 39.67 | c | 44.87 | 52.23 | 54.84 | 52.32 | 49.63 | 42.16 | 40.24 | a | 34.19 | 42.90 | |||||||||
| 2007 | 31.03 | 37.54 | 40.43 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.28 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 33.80 | 35.14 | 37.39 | 40.37 | 45.12 | 50.04 | 53.72 | 53.12 | 49.34 | 42.75 | 37.86 | 33.97 | 42.73 | |||||||||||||
| S.D. | 3.63 | 2.65 | 2.04 | 2.00 | 2.15 | 1.84 | 1.80 | 1.93 | 2.15 | 2.39 | 3.69 | 3.10 | 1.16 | |||||||||||||
| SKEW | -0.73 | -0.40 | 0.03 | -0.67 | 0.67 | -0.34 | 0.91 | -0.53 | 0.35 | 0.33 | -0.53 | -0.70 | 0.36 | |||||||||||||
| MAX | 39.94 | 39.93 | 41.10 | 43.60 | 50.13 | 52.87 | 58.55 | 56.90 | 54.30 | 48.45 | 44.43 | 38.77 | 45.47 | |||||||||||||
| MIN | 24.61 | 27.79 | 33.97 | 35.33 | 42.32 | 45.93 | 50.97 | 47.94 | 45.40 | 38.61 | 29.83 | 26.84 | 40.47 | |||||||||||||
| NO YRS | 32 | 34 | 34 | 33 | 31 | 32 | 32 | 31 | 30 | 31 | 33 | 33 | 25 | |||||||||||||