| 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 | 27.15 | r | 28.90 | 20.13 | a | 24.52 | ||
| 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 | 41.45 | 34.00 | 31.35 | 28.13 | 24.03 | 31.79 | ||||||
| 1987 | 20.13 | 23.89 | 26.13 | 30.63 | 34.84 | 40.17 | 41.26 | 40.06 | 37.60 | e | 31.42 | 28.87 | 15.20 | k | 32.27 | |||||||||||
| 1988 | 19.80 | a | 25.14 | a | 25.77 | 30.67 | 33.61 | 37.67 | 43.90 | a | 41.71 | g | 36.13 | 36.52 | 28.10 | 21.97 | 30.84 | |||||||||
| 1989 | 20.10 | 11.89 | 24.32 | 31.23 | 34.32 | 41.60 | 43.10 | 41.81 | 38.63 | 32.00 | 27.46 | d | 22.03 | 30.71 | ||||||||||||
| 1990 | 24.71 | 19.07 | 24.94 | 29.33 | 32.42 | 38.00 | 43.52 | 43.65 | 39.37 | 30.26 | 29.67 | 10.74 | 30.47 | |||||||||||||
| 1991 | 19.42 | 29.11 | 23.45 | 29.07 | 33.61 | 37.10 | 46.74 | 45.48 | 35.23 | 29.65 | 29.17 | 26.71 | 32.06 | |||||||||||||
| 1992 | 24.55 | 29.34 | 28.71 | 32.50 | 36.06 | 40.00 | 41.16 | 40.65 | 35.40 | 33.19 | 28.93 | 21.13 | 32.64 | |||||||||||||
| 1993 | 18.29 | 17.32 | 27.29 | 30.53 | 36.94 | 37.93 | 37.77 | 40.13 | 36.53 | 32.65 | 20.23 | 24.94 | 30.05 | |||||||||||||
| 1994 | 24.03 | 20.11 | 26.16 | 31.90 | 36.00 | 35.57 | 41.19 | 37.61 | 38.63 | 29.42 | 19.33 | 21.32 | 30.11 | |||||||||||||
| 1995 | 27.90 | 23.54 | 25.74 | 28.73 | 35.35 | 38.97 | 47.45 | 40.16 | 42.13 | 33.94 | 33.53 | 27.87 | 33.78 | |||||||||||||
| 1996 | 25.71 | 24.07 | 25.77 | 31.10 | 32.71 | 37.53 | 44.06 | 42.74 | 36.57 | 33.71 | 28.37 | 25.94 | 32.36 | |||||||||||||
| 1997 | 22.55 | 24.21 | 26.26 | 29.03 | 34.29 | j | 39.27 | o | 42.40 | p | 44.62 | o | 46.08 | r | 31.12 | o | 32.13 | 22.74 | 26.15 | |||||||
| 1998 | 27.39 | 29.40 | h | 23.29 | 31.00 | l | 37.67 | v | 40.17 | l | 47.50 | m | 38.47 | n | 36.50 | n | 32.46 | r | 29.67 | o | 17.71 | g | 25.34 | |||
| 1999 | 23.81 | j | 23.83 | d | 24.24 | n | 25.42 | k | 28.00 | t | 36.94 | l | 41.09 | t | 45.13 | p | 37.10 | t | 35.00 | y | 32.41 | m | 28.27 | p | 23.83 | |
| 2000 | 21.50 | i | 24.65 | l | 24.80 | p | 28.57 | p | 34.00 | m | 39.37 | k | 38.90 | u | 37.63 | l | ----- | z | 32.00 | n | 25.27 | s | 27.60 | z | 9999.00 | |
| 2001 | 23.53 | p | 20.18 | k | 26.65 | k | 27.47 | m | 33.28 | m | 36.41 | m | 40.12 | o | 40.31 | o | 36.94 | n | 28.10 | u | 30.50 | t | 24.17 | g | 9999.00 | |
| 2002 | 19.05 | j | 21.43 | 21.32 | i | 26.67 | o | 29.53 | n | 39.58 | k | 42.21 | q | 37.33 | m | 34.87 | o | 29.20 | u | 27.62 | n | 25.11 | m | 21.43 | ||
| 2003 | 24.47 | n | 23.73 | m | 26.80 | p | 27.63 | k | ----- | z | 37.93 | o | 40.28 | m | 41.67 | m | 35.73 | s | 34.53 | l | 22.00 | v | 27.18 | n | 9999.00 | |
| 2004 | 23.80 | k | 26.05 | j | 27.38 | o | 29.72 | l | 34.62 | o | 39.69 | n | 41.56 | o | 43.85 | r | 37.36 | p | 33.27 | p | 24.28 | l | 24.44 | o | 9999.00 | |
| 2005 | 22.21 | l | 25.00 | n | 28.06 | m | 30.18 | m | 33.71 | q | 35.71 | m | 44.70 | u | 38.74 | l | 31.44 | n | 35.27 | t | 21.85 | q | 22.00 | l | 9999.00 | |
| 2006 | 25.53 | l | 19.12 | k | 22.71 | j | 27.65 | g | ----- | z | 42.67 | l | 41.27 | t | 38.18 | n | 35.96 | f | 31.03 | 28.73 | 21.97 | 27.24 | ||||
| 2007 | 16.87 | 26.18 | 26.90 | 29.43 | 34.61 | 37.87 | 46.81 | 39.55 | 34.73 | 32.00 | 26.43 | 23.00 | 31.20 | |||||||||||||
| 2008 | 18.26 | 24.52 | 22.84 | 24.37 | 32.42 | 34.27 | 40.55 | 45.03 | 39.23 | 34.23 | 31.23 | 20.52 | 30.62 | |||||||||||||
| 2009 | 20.10 | 24.00 | a | 24.26 | 26.00 | 33.61 | 41.63 | 42.68 | 40.84 | 38.77 | 31.42 | 26.17 | 17.00 | 30.54 | ||||||||||||
| 2010 | 28.97 | 27.07 | 25.71 | 27.10 | 32.84 | 38.50 | 42.29 | 41.13 | 39.07 | 34.00 | 26.63 | 25.94 | 32.44 | |||||||||||||
| 2011 | 23.84 | 19.82 | 26.97 | 25.20 | 30.81 | 36.83 | 38.74 | 40.19 | 41.10 | 34.03 | 26.46 | b | 19.19 | 30.27 | ||||||||||||
| 2012 | 22.74 | 23.48 | 22.58 | 28.85 | d | 32.42 | 37.17 | 42.68 | 40.32 | 37.20 | 33.00 | 29.33 | 22.94 | 31.06 | ||||||||||||
| 2013 | 17.81 | 22.32 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.06 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 22.27 | 23.02 | 25.39 | 29.16 | 33.91 | 38.17 | 42.74 | 41.30 | 37.67 | 32.43 | 27.89 | 22.11 | 31.31 | |||||||||||||
| S.D. | 3.66 | 4.03 | 1.66 | 2.32 | 1.65 | 1.98 | 2.72 | 2.05 | 2.24 | 1.83 | 3.35 | 3.87 | 1.15 | |||||||||||||
| SKEW | 0.29 | -0.90 | -0.08 | -0.66 | 0.13 | 0.12 | 0.11 | 0.62 | 0.21 | 0.22 | -1.13 | -1.19 | 0.75 | |||||||||||||
| MAX | 28.97 | 29.34 | 28.71 | 32.50 | 36.94 | 41.63 | 47.45 | 45.48 | 42.13 | 36.52 | 33.53 | 27.87 | 33.78 | |||||||||||||
| MIN | 16.87 | 11.89 | 22.58 | 24.37 | 30.81 | 34.27 | 37.77 | 37.61 | 34.00 | 29.42 | 19.33 | 10.74 | 30.05 | |||||||||||||
| NO YRS | 19 | 20 | 18 | 17 | 16 | 16 | 16 | 16 | 17 | 18 | 20 | 19 | 14 | |||||||||||||