| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1956 | ----- | z | ----- | z | 38.76 | f | 46.33 | 53.92 | 58.30 | 68.05 | 64.52 | 60.35 | 47.10 | 39.58 | 35.43 | j | 54.77 | |||||||||
| 1957 | ----- | z | ----- | z | 40.50 | j | 45.23 | f | 50.85 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1958 | ----- | z | ----- | z | 40.38 | z | 45.33 | a | 59.88 | a | 61.18 | 68.79 | 69.94 | 59.42 | 52.32 | 42.37 | 43.13 | 55.82 | ||||||||
| 1959 | 37.04 | c | 34.04 | 41.50 | 49.38 | 48.77 | 63.90 | 71.58 | 66.60 | 55.47 | 52.21 | 42.35 | 32.21 | g | 51.17 | |||||||||||
| 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 | 55.29 | g | 58.72 | 63.42 | 64.85 | 60.22 | 55.22 | k | 40.27 | 35.06 | 53.76 | |||||||
| 1964 | 32.26 | 32.60 | 35.63 | 43.72 | 50.71 | 58.25 | 68.63 | 66.13 | 57.33 | 52.76 | 35.87 | 33.37 | 47.27 | |||||||||||||
| 1965 | 32.26 | 36.98 | 38.71 | 46.30 | 50.84 | 60.05 | 66.82 | 63.94 | 53.63 | 52.79 | 40.37 | 30.94 | 47.80 | |||||||||||||
| 1966 | 31.58 | 31.52 | 39.53 | 48.33 | 57.73 | 58.88 | 65.55 | 67.13 | 59.20 | 49.05 | 40.67 | 34.13 | 48.61 | |||||||||||||
| 1967 | 34.32 | 37.27 | 37.08 | 36.75 | 53.29 | 60.22 | 70.98 | 71.40 | 62.62 | 51.19 | 42.80 | 27.73 | 48.80 | |||||||||||||
| 1968 | 31.68 | 40.64 | 42.98 | 45.15 | 53.23 | 63.97 | 73.29 | 63.77 | 60.58 | 50.76 | 37.95 | 30.63 | 49.55 | |||||||||||||
| 1969 | 31.74 | 30.66 | 35.19 | 45.65 | 57.69 | 62.02 | 69.85 | 69.35 | 63.30 | 44.69 | 41.88 | 35.85 | 48.99 | |||||||||||||
| 1970 | 33.85 | 40.16 | 39.20 | i | 40.62 | 55.27 | 63.95 | 72.03 | 70.74 | 56.63 | d | 48.21 | 40.78 | 27.02 | 49.93 | |||||||||||
| 1971 | 35.21 | e | 36.29 | 32.67 | h | 44.62 | 51.69 | 58.83 | 71.94 | d | 73.68 | 55.82 | 46.16 | 38.68 | 27.81 | 49.16 | ||||||||||
| 1972 | 29.06 | 35.14 | 45.92 | f | 43.33 | 56.69 | 63.94 | c | 70.85 | 70.98 | d | 56.70 | 48.66 | 37.28 | 27.00 | 49.06 | ||||||||||
| 1973 | 28.97 | 36.77 | 37.87 | 46.38 | 60.29 | 65.20 | 71.85 | 72.52 | i | 61.53 | 50.74 | h | 37.85 | 36.60 | 48.33 | |||||||||||
| 1974 | 29.52 | 35.66 | 39.45 | 45.30 | 54.18 | 68.30 | 70.54 | c | 69.81 | 64.85 | 51.63 | 42.16 | b | 32.50 | d | 50.32 | ||||||||||
| 1975 | 33.03 | b | 33.17 | d | 37.15 | 38.95 | 53.24 | 60.83 | 72.10 | 66.71 | 64.65 | 49.18 | 37.52 | 37.21 | 48.64 | |||||||||||
| 1976 | 35.65 | 35.84 | 35.94 | 44.65 | 58.06 | 60.10 | 71.52 | 63.82 | 64.23 | 52.40 | 44.98 | 36.02 | 50.27 | |||||||||||||
| 1977 | 26.42 | 39.62 | 36.87 | 51.05 | 48.10 | 67.78 | 70.53 | 71.81 | 59.78 | ----- | z | ----- | z | ----- | z | 52.44 | ||||||||||
| 1978 | 34.42 | y | 41.36 | n | 47.76 | 44.82 | 52.46 | f | 60.64 | i | 69.45 | 66.75 | e | 55.54 | d | 54.75 | e | 35.90 | 27.87 | 50.35 | ||||||
| 1979 | 26.60 | 34.95 | 42.44 | 45.87 | 55.98 | 63.53 | 71.98 | 67.81 | 65.22 | 53.73 | 36.38 | 36.39 | 50.07 | |||||||||||||
| 1980 | 33.69 | 41.19 | 38.81 | 48.55 | 54.03 | 58.63 | 71.32 | 67.37 | 61.93 | 52.26 | 41.82 | 38.21 | 50.65 | |||||||||||||
| 1981 | 35.23 | 35.50 | 40.77 | 48.30 | 54.47 | 63.05 | 70.02 | 72.10 | 61.13 | 45.79 | 40.70 | 36.39 | 50.29 | |||||||||||||
| 1982 | 29.78 | a | 34.23 | 37.94 | 41.45 | 52.44 | 60.98 | 67.82 | 68.60 | 54.27 | 46.81 | w | 33.33 | 30.42 | 46.48 | |||||||||||
| 1983 | 35.08 | 36.61 | 40.11 | 41.27 | 53.85 | 59.40 | 67.19 | 69.81 | m | 59.98 | 51.19 | 38.52 | 38.30 | z | 48.32 | |||||||||||
| 1984 | 32.66 | ----- | z | ----- | z | 43.83 | 55.85 | 59.15 | 72.26 | 70.79 | 60.02 | 44.13 | ----- | z | ----- | z | 54.84 | |||||||||
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.72 | e | 73.55 | 65.73 | 52.36 | a | 46.05 | ----- | z | 31.48 | 55.65 | |||||
| 1986 | 40.19 | 38.77 | ----- | z | ----- | z | 63.56 | n | 67.50 | 66.42 | ----- | z | ----- | z | 49.78 | o | 40.95 | a | 35.18 | 48.17 | ||||||
| 1987 | 30.39 | 37.71 | 42.00 | 53.91 | a | 58.21 | 65.65 | 66.12 | b | 69.48 | 65.42 | 57.42 | 40.62 | 31.23 | 51.51 | |||||||||||
| 1988 | 30.71 | 39.83 | 43.76 | 50.53 | 55.35 | 65.37 | 73.02 | 69.45 | 61.35 | 59.26 | 39.45 | 31.06 | 51.60 | |||||||||||||
| 1989 | 26.61 | 24.25 | 43.22 | a | 51.23 | 53.11 | 64.05 | 71.63 | 65.55 | 59.65 | 49.82 | 40.26 | a | 34.81 | 48.68 | |||||||||||
| 1990 | 34.02 | 30.46 | 47.95 | 52.50 | 52.39 | 60.95 | 69.76 | 68.90 | 62.17 | 47.66 | 30.98 | 21.79 | 48.29 | |||||||||||||
| 1991 | 33.42 | ----- | z | ----- | z | 43.32 | 48.77 | ----- | z | ----- | z | ----- | z | ----- | z | 51.37 | 40.88 | 33.92 | 41.95 | |||||||
| 1992 | 35.23 | ----- | z | 43.52 | 48.95 | ----- | z | ----- | z | 65.58 | l | 69.59 | n | 61.72 | l | 52.00 | 35.53 | k | 27.72 | o | 44.92 | |||||
| 1993 | ----- | z | ----- | z | 41.47 | a | 43.23 | o | 55.79 | q | 55.77 | o | 61.60 | u | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.47 | |
| 1994 | 35.52 | j | 31.06 | l | 44.38 | j | 47.86 | p | 54.39 | q | 60.65 | m | 72.23 | r | 68.75 | q | 63.40 | o | 48.50 | r | 26.11 | u | 26.24 | l | 9999.00 | |
| 1995 | 33.48 | 45.84 | l | 38.43 | q | 45.00 | s | 53.56 | v | 56.95 | t | 65.95 | u | 67.92 | r | 61.69 | q | 49.31 | o | 44.69 | q | 35.21 | l | 33.48 | ||
| 1996 | 28.85 | u | 36.47 | n | 40.78 | o | 45.25 | p | 51.94 | w | ----- | z | ----- | z | ----- | z | ----- | z | 49.46 | q | 38.67 | r | 33.92 | r | 9999.00 | |
| 1997 | 31.59 | i | 35.00 | k | 41.55 | k | 42.74 | k | 60.97 | p | ----- | z | 69.70 | p | 69.56 | o | 60.53 | o | 50.47 | o | 44.25 | p | 33.12 | o | 9999.00 | |
| 1998 | 35.00 | r | 29.46 | 39.00 | 46.21 | i | 46.15 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.22 | l | 30.42 | 32.96 | ||||
| 1999 | 33.63 | e | 29.50 | m | 39.50 | i | 40.78 | j | ----- | z | 59.63 | o | 69.12 | o | 67.41 | o | 60.40 | o | 52.88 | n | 44.30 | 34.42 | 37.45 | |||
| 2000 | 33.74 | 37.19 | 39.61 | 50.69 | l | 53.29 | 62.52 | d | ----- | z | 67.26 | n | 59.13 | g | 48.58 | 34.75 | d | 35.03 | m | 44.24 | ||||||
| 2001 | 32.29 | 31.93 | 42.21 | 42.05 | 58.98 | i | 59.67 | i | 68.21 | g | 68.67 | z | 60.61 | p | 57.28 | o | 39.67 | f | 31.48 | i | 37.12 | |||||
| 2002 | 31.40 | 36.00 | 37.36 | i | 51.40 | t | 49.61 | l | 61.52 | ----- | z | ----- | z | 62.13 | o | 46.66 | i | 40.22 | 35.89 | 41.00 | ||||||
| 2003 | 39.60 | 34.36 | 40.82 | 40.92 | 50.74 | b | 64.23 | ----- | z | ----- | z | 61.24 | g | 55.04 | e | 33.42 | 33.18 | 43.59 | ||||||||
| 2004 | 31.55 | 33.58 | j | 46.47 | 47.85 | m | 53.53 | 61.58 | d | 70.44 | d | 68.35 | e | 57.46 | e | 46.92 | f | 35.39 | h | 35.16 | 53.07 | |||||
| 2005 | 30.81 | 35.11 | 41.24 | 42.30 | 50.23 | 56.22 | 72.23 | ----- | z | 57.69 | n | 49.20 | k | 38.97 | 30.24 | 44.15 | ||||||||||
| 2006 | 32.87 | 33.07 | 33.65 | 40.17 | j | 57.19 | m | 65.47 | 74.19 | d | ----- | z | 64.20 | y | 50.00 | c | 37.78 | l | 30.50 | c | 45.68 | |||||
| 2007 | 29.12 | a | 35.54 | 44.07 | c | 44.92 | 55.52 | d | 61.40 | ----- | z | 71.00 | q | 54.47 | j | 46.74 | 40.52 | 27.54 | c | 42.82 | ||||||
| 2008 | 25.58 | 33.52 | 36.95 | 44.27 | f | 56.04 | f | 60.20 | 71.89 | 69.54 | q | 61.36 | s | 52.42 | g | 43.02 | e | 29.03 | 42.88 | |||||||
| 2009 | 33.68 | 33.64 | 36.67 | b | 43.97 | k | 55.50 | p | 60.71 | p | 71.37 | p | 73.50 | z | 65.10 | o | 45.03 | n | 38.66 | k | 27.52 | h | 34.66 | |||
| 2010 | 36.69 | e | 35.36 | 37.14 | j | 41.26 | m | 44.12 | r | 61.12 | r | 69.61 | v | 69.24 | n | 61.28 | n | 52.18 | q | 35.63 | k | 35.02 | h | 36.02 | ||
| 2011 | 31.81 | d | 30.52 | 36.37 | 40.95 | j | 48.07 | p | 48.33 | z | 69.03 | p | 70.75 | w | 65.83 | o | 49.11 | m | 36.73 | d | 30.73 | c | 33.23 | |||
| 2012 | 34.09 | b | 32.73 | a | 37.52 | a | 47.72 | l | 55.69 | o | 60.82 | s | 72.71 | q | 72.65 | n | 68.12 | z | 51.58 | k | 41.50 | h | 30.50 | 33.71 | ||
| 2013 | 25.50 | b | 32.79 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.14 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.32 | 34.90 | 40.06 | 45.49 | 53.98 | 62.12 | 70.22 | 68.14 | 59.77 | 50.47 | 39.33 | 32.40 | 49.46 | |||||||||||||
| S.D. | 3.32 | 3.41 | 3.50 | 3.90 | 3.09 | 2.95 | 2.51 | 2.73 | 3.54 | 3.54 | 3.13 | 4.02 | 1.27 | |||||||||||||
| SKEW | -0.09 | -0.53 | 0.46 | 0.11 | 0.09 | 0.24 | -0.80 | 0.04 | -0.25 | 0.31 | -0.65 | -0.02 | 0.10 | |||||||||||||
| MAX | 40.19 | 41.19 | 47.95 | 53.91 | 60.29 | 68.30 | 74.19 | 73.68 | 65.42 | 59.26 | 44.98 | 43.13 | 51.60 | |||||||||||||
| MIN | 25.50 | 24.25 | 33.65 | 36.75 | 48.10 | 56.22 | 63.42 | 63.77 | 52.36 | 44.13 | 30.98 | 21.79 | 47.27 | |||||||||||||
| NO YRS | 44 | 39 | 36 | 34 | 33 | 38 | 35 | 29 | 31 | 32 | 37 | 38 | 16 | |||||||||||||