| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.69 | r | 41.95 | 27.32 | a | 34.63 | ||
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.92 | 50.07 | 50.56 | 41.28 | 36.45 | 48.46 | ||||||
| 1987 | 30.03 | 36.36 | 37.50 | b | 47.00 | b | 51.35 | 61.06 | f | 58.27 | a | 60.23 | a | 57.37 | g | 49.94 | 38.78 | 24.55 | k | 45.50 | ||||||
| 1988 | 26.25 | a | 35.71 | a | 32.94 | 40.55 | a | 46.16 | c | 51.94 | d | 61.53 | b | 58.23 | g | 53.00 | 53.69 | 34.43 | 30.10 | 42.39 | ||||||
| 1989 | 29.02 | 20.79 | 32.37 | 42.75 | 46.05 | 57.23 | 57.35 | 56.19 | 54.40 | 43.63 | 36.58 | f | 35.53 | 43.21 | ||||||||||||
| 1990 | 31.02 | 26.70 | 35.34 | 43.28 | 44.52 | 51.68 | 62.23 | 59.89 | 57.18 | 43.52 | 35.97 | 20.69 | 42.67 | |||||||||||||
| 1991 | 30.32 | 39.45 | 32.29 | 37.45 | 43.40 | 51.05 | 66.81 | 65.31 | 57.75 | 45.79 | 36.22 | 33.24 | 44.92 | |||||||||||||
| 1992 | 32.53 | 37.50 | 41.94 | 43.23 | 55.42 | 56.97 | 57.66 | 61.55 | 53.78 | 49.08 | 35.97 | 26.63 | 46.02 | |||||||||||||
| 1993 | 25.15 | 26.98 | 37.58 | 38.53 | 51.24 | 51.55 | 52.37 | 57.31 | 55.85 | 46.68 | 33.28 | 32.71 | 42.44 | |||||||||||||
| 1994 | 33.87 | 29.98 | 38.08 | 42.27 | 49.48 | 51.27 | 61.90 | 57.24 | 55.65 | 43.11 | 27.50 | a | 28.58 | 43.24 | ||||||||||||
| 1995 | 32.42 | 37.07 | 34.11 | 39.02 | 48.65 | 51.02 | 60.52 | 55.42 | 56.58 | 44.37 | 40.47 | 32.63 | 44.36 | |||||||||||||
| 1996 | 31.55 | 31.21 | 35.92 | 40.42 | 43.73 | 52.95 | 62.65 | 61.13 | 51.17 | 44.13 | 35.65 | 31.15 | 43.47 | |||||||||||||
| 1997 | 29.97 | 32.21 | 35.02 | 37.89 | c | 48.25 | k | 52.77 | q | 59.93 | q | 63.07 | x | 57.50 | r | 43.22 | o | 38.50 | a | 29.89 | 33.91 | |||||
| 1998 | 33.02 | 34.42 | h | 34.53 | 42.89 | l | 44.69 | w | 54.79 | p | 65.97 | n | 59.82 | q | 57.71 | p | 46.44 | v | 35.00 | o | 24.96 | g | 33.77 | |||
| 1999 | 30.63 | l | 30.08 | d | 32.68 | n | 35.55 | k | 35.65 | u | 51.82 | m | 62.56 | v | 62.69 | r | 57.50 | t | 44.50 | z | 41.91 | n | 33.43 | q | 30.08 | |
| 2000 | 28.70 | i | 33.24 | l | 34.68 | q | 43.85 | t | 45.61 | m | 55.25 | l | 56.35 | u | 59.37 | l | ----- | z | 42.91 | n | 31.67 | u | 33.75 | z | 9999.00 | |
| 2001 | 32.14 | q | 29.91 | k | 36.21 | l | 38.29 | m | 48.31 | o | 50.67 | o | 56.75 | q | 60.28 | o | 54.12 | n | 40.64 | x | 36.31 | v | 29.67 | g | 9999.00 | |
| 2002 | 27.14 | j | 32.30 | 31.82 | i | 40.77 | o | 42.76 | n | 56.29 | k | 63.14 | q | 57.39 | m | 53.70 | o | 42.45 | u | 39.28 | n | 33.31 | m | 32.30 | ||
| 2003 | 33.35 | n | 31.18 | n | 34.92 | s | 35.37 | k | ----- | z | 57.18 | p | 61.89 | m | 60.72 | m | 55.64 | s | 47.87 | l | 28.31 | v | 32.88 | n | 9999.00 | |
| 2004 | 31.23 | k | 33.21 | j | 38.97 | o | 44.61 | l | 46.75 | o | 54.59 | n | 61.59 | o | 59.92 | r | 53.04 | p | 43.97 | p | 36.75 | l | 34.16 | o | 9999.00 | |
| 2005 | 30.74 | l | 33.96 | o | 38.39 | m | 39.68 | m | 45.39 | q | 48.03 | m | 62.80 | u | 58.97 | l | 52.25 | n | 50.18 | t | 33.81 | q | 30.74 | l | 9999.00 | |
| 2006 | 31.58 | l | 30.88 | l | 31.62 | j | 39.15 | g | ----- | z | 56.94 | l | 60.32 | t | 56.88 | n | 51.54 | g | 43.31 | 34.30 | 30.24 | 35.95 | ||||
| 2007 | 26.37 | 33.11 | 37.61 | 39.10 | 47.06 | 51.18 | 61.79 | 56.24 | 49.62 | 41.02 | 36.43 | 28.74 | 42.36 | |||||||||||||
| 2008 | 25.39 | 31.62 | 31.45 | 32.43 | 43.63 | 47.63 | 57.87 | 59.61 | 54.10 | 46.21 | 39.37 | 28.85 | 41.51 | |||||||||||||
| 2009 | 28.98 | 33.06 | a | 31.21 | 36.00 | 47.00 | 53.40 | 60.97 | 57.84 | 55.32 | 40.77 | 33.62 | 24.60 | 41.90 | ||||||||||||
| 2010 | 34.61 | 33.95 | 34.95 | 36.12 | 41.61 | 49.27 | 59.24 | 57.55 | 51.18 | 44.90 | 32.65 | 30.37 | 42.20 | |||||||||||||
| 2011 | 31.76 | 27.84 | 32.82 | 33.42 | 39.55 | 48.97 | 54.05 | 58.40 | 56.91 | a | 44.32 | 32.73 | b | 30.87 | 40.97 | |||||||||||
| 2012 | 30.94 | 30.83 | 31.19 | 39.02 | d | 45.74 | 48.75 | 58.56 | 59.98 | 56.18 | 44.47 | 36.50 | 27.94 | 42.51 | ||||||||||||
| 2013 | 27.68 | 30.73 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.20 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 30.05 | 31.87 | 34.83 | 39.32 | 46.54 | 51.66 | 59.61 | 59.24 | 54.30 | 45.53 | 36.08 | 29.82 | 42.97 | |||||||||||||
| S.D. | 2.83 | 4.34 | 2.90 | 3.73 | 4.02 | 2.71 | 3.49 | 2.78 | 2.61 | 3.37 | 3.51 | 3.67 | 1.42 | |||||||||||||
| SKEW | -0.31 | -0.52 | 0.69 | 0.04 | 0.43 | 0.77 | -0.21 | 0.68 | -0.51 | 0.88 | -0.35 | -0.45 | 0.79 | |||||||||||||
| MAX | 34.61 | 39.45 | 41.94 | 47.00 | 55.42 | 57.23 | 66.81 | 65.31 | 57.75 | 53.69 | 41.95 | 36.45 | 46.02 | |||||||||||||
| MIN | 25.15 | 20.79 | 31.19 | 32.43 | 39.55 | 47.63 | 52.37 | 55.42 | 49.62 | 40.77 | 27.50 | 20.69 | 40.97 | |||||||||||||
| NO YRS | 19 | 20 | 18 | 17 | 16 | 15 | 16 | 16 | 16 | 18 | 19 | 19 | 13 | |||||||||||||