| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1939 | ----- | z | ----- | z | ----- | z | ----- | z | 50.79 | 52.80 | 64.27 | 65.21 | 55.85 | 46.13 | 39.93 | 36.95 | 51.49 | |||||||||
| 1940 | 32.94 | 33.62 | 38.74 | 42.45 | 51.65 | 60.75 | 62.50 | 63.82 | 53.07 | 47.21 | 32.18 | 31.97 | 45.91 | |||||||||||||
| 1941 | 30.29 | 33.23 | 38.18 | 40.83 | 48.58 | a | 51.45 | 63.98 | 59.94 | 48.75 | 44.05 | 40.27 | 29.94 | 44.12 | ||||||||||||
| 1942 | 25.60 | 25.32 | 31.97 | 41.73 | 44.03 | 51.55 | 63.34 | 62.45 | 55.17 | 47.42 | 36.28 | 34.05 | 43.24 | |||||||||||||
| 1943 | 27.63 | 34.43 | 35.37 | 45.18 | 45.05 | 48.47 | 62.35 | 59.19 | 59.92 | 46.05 | 39.15 | 29.53 | 44.36 | |||||||||||||
| 1944 | 26.60 | 27.86 | 33.24 | 38.88 | 47.06 | 49.47 | 60.60 | 59.52 | 54.97 | 49.69 | 28.02 | e | 29.35 | r | 43.26 | |||||||||||
| 1945 | 30.52 | 30.48 | 31.53 | 39.87 | 47.24 | 51.20 | 63.71 | 62.82 | 52.58 | 47.76 | 33.70 | 28.34 | 43.31 | |||||||||||||
| 1946 | 28.08 | 28.34 | 35.66 | 44.37 | 49.15 | 53.67 | 62.89 | 63.40 | 59.50 | z | ----- | z | 35.90 | o | 31.68 | 44.14 | ||||||||||
| 1947 | 26.42 | 35.64 | 38.34 | 40.44 | f | 53.65 | 51.03 | 60.92 | 60.58 | 55.75 | 47.18 | 32.77 | 29.58 | 44.71 | ||||||||||||
| 1948 | 31.53 | 26.50 | 29.73 | 36.13 | 44.53 | 53.63 | 57.97 | a | 58.19 | 51.55 | 44.69 | b | 33.38 | 21.56 | 40.78 | |||||||||||
| 1949 | 11.53 | 25.18 | 31.64 | t | 46.40 | o | 49.26 | 53.66 | a | 62.24 | 61.35 | 56.93 | 41.48 | 44.85 | 28.55 | 43.50 | ||||||||||
| 1950 | 21.52 | a | 30.98 | 32.11 | 39.40 | 44.97 | a | 52.91 | a | 63.22 | b | 63.10 | a | 54.43 | 47.58 | a | 41.20 | 38.42 | a | 44.15 | ||||||
| 1951 | 27.00 | a | 31.22 | a | 29.84 | 43.67 | a | 47.39 | 54.41 | a | 63.42 | 61.29 | 57.14 | a | 42.73 | a | 34.52 | a | 24.21 | 43.07 | ||||||
| 1952 | 23.92 | 28.97 | 28.16 | 43.88 | 49.39 | 52.55 | 63.69 | b | 61.13 | a | 57.93 | b | 52.90 | 32.32 | 29.19 | 43.67 | ||||||||||
| 1953 | 37.02 | 32.09 | 34.90 | 39.00 | 41.37 | 48.93 | 62.81 | 60.07 | a | 59.33 | 45.90 | 40.00 | a | 33.20 | a | 44.55 | ||||||||||
| 1954 | 28.12 | o | 37.25 | 31.38 | a | 42.67 | 51.58 | a | 51.02 | b | 62.57 | a | 57.71 | 52.19 | a | 45.29 | 40.78 | a | 27.90 | a | 45.48 | |||||
| 1955 | 23.12 | a | 26.34 | 31.19 | 32.81 | a | 44.31 | 56.00 | 57.77 | c | 62.87 | 53.17 | 47.45 | a | 32.78 | a | 28.32 | 41.34 | ||||||||
| 1956 | 27.90 | 24.93 | a | 35.71 | b | 42.07 | 48.89 | 52.75 | 62.45 | 59.00 | 54.93 | 41.98 | a | 36.37 | 32.22 | a | 43.27 | |||||||||
| 1957 | 20.56 | 33.78 | a | 35.26 | 40.31 | a | 47.19 | 55.33 | d | 61.15 | 58.16 | 57.33 | 41.19 | 31.63 | 33.21 | 42.93 | ||||||||||
| 1958 | 31.00 | 36.14 | 29.60 | 38.28 | 53.40 | 54.50 | 61.44 | 64.92 | 53.72 | 49.56 | 37.08 | 37.71 | 45.61 | |||||||||||||
| 1959 | 32.00 | 28.77 | 35.18 | a | 43.22 | 42.35 | 57.10 | 65.71 | 60.24 | 51.52 | 45.39 | 38.50 | 31.00 | 44.25 | ||||||||||||
| 1960 | 24.08 | 27.42 | i | 35.79 | b | 41.03 | 43.84 | 57.63 | 66.47 | 59.62 | b | 56.00 | a | 45.18 | 32.67 | c | 31.13 | 44.86 | ||||||||
| 1961 | 33.53 | 33.37 | b | 34.41 | b | 39.56 | c | 46.59 | b | 62.72 | 65.60 | 66.85 | a | 50.27 | 44.74 | 32.22 | 26.21 | e | 44.67 | |||||||
| 1962 | 24.73 | 30.45 | f | 27.52 | 45.00 | 44.42 | 55.50 | 61.45 | 60.77 | 58.38 | 46.13 | 36.88 | 35.02 | c | 45.07 | |||||||||||
| 1963 | 26.45 | a | 38.21 | d | 32.43 | c | 33.46 | c | 50.69 | b | 52.76 | a | 58.55 | a | 60.05 | a | 59.17 | a | 48.52 | c | 37.09 | a | 32.87 | a | 44.19 | |
| 1964 | 24.15 | h | 28.40 | 29.93 | d | 36.25 | b | 44.38 | a | 52.57 | 63.32 | 60.17 | a | 52.55 | a | 49.93 | d | 32.24 | a | 28.78 | b | 43.50 | ||||
| 1965 | 30.45 | b | 33.38 | d | 33.03 | b | 40.41 | c | 43.70 | a | 53.72 | 60.26 | 59.26 | 48.85 | 50.82 | a | 37.47 | 26.85 | 43.18 | |||||||
| 1966 | 27.61 | 26.52 | 34.58 | 42.37 | 51.15 | 53.33 | 61.39 | 63.16 | 57.28 | 48.24 | b | 37.43 | 30.68 | 44.48 | ||||||||||||
| 1967 | 31.00 | 34.82 | 31.60 | 31.67 | 47.71 | 54.35 | 65.79 | 66.27 | 59.12 | 46.05 | a | 38.33 | 25.82 | 44.38 | ||||||||||||
| 1968 | 28.65 | 36.22 | 37.11 | 37.93 | 47.05 | 56.37 | 66.76 | 58.34 | 54.52 | 46.21 | 35.07 | 26.95 | 44.26 | |||||||||||||
| 1969 | 26.76 | 26.07 | 30.71 | 40.25 | 51.18 | 54.63 | 61.40 | 62.23 | 56.93 | 39.65 | 38.20 | b | 32.48 | d | 43.37 | |||||||||||
| 1970 | 30.16 | b | 35.57 | 33.06 | 33.80 | 48.10 | 57.92 | 64.45 | 64.55 | 51.17 | 43.08 | 37.50 | 25.05 | 43.70 | ||||||||||||
| 1971 | 31.79 | 31.55 | 30.81 | 38.63 | 46.27 | 51.60 | 63.32 | 66.67 | a | 50.57 | 43.46 | c | 33.75 | f | 24.61 | 43.57 | ||||||||||
| 1972 | 25.16 | b | 32.55 | 40.16 | 37.15 | 49.24 | 56.86 | a | 63.45 | 63.18 | 50.40 | 43.15 | 32.95 | 22.19 | g | 44.93 | ||||||||||
| 1973 | 25.95 | 33.00 | a | 31.32 | 37.92 | 51.79 | 56.26 | a | 63.65 | 61.84 | 55.15 | f | 43.74 | d | 34.67 | d | ----- | z | 44.01 | |||||||
| 1974 | 25.12 | f | 29.02 | 32.78 | b | 38.23 | 44.72 | a | 59.80 | c | 61.41 | d | 60.50 | 57.09 | a | 44.94 | 37.12 | e | 27.50 | g | 46.56 | |||||
| 1975 | 30.33 | e | 27.84 | i | 28.09 | d | 31.62 | a | 45.50 | 52.50 | 63.47 | 58.32 | f | 56.47 | l | 43.89 | d | 33.73 | d | 34.60 | 40.41 | |||||
| 1976 | 31.94 | 29.46 | b | 30.29 | 37.36 | a | 49.98 | 52.29 | a | 63.00 | 56.44 | 56.81 | c | 46.67 | a | 41.59 | c | 33.16 | 44.08 | |||||||
| 1977 | 26.35 | 35.52 | 30.68 | 44.66 | a | 41.63 | 59.40 | a | 61.95 | 64.00 | 53.75 | 46.61 | 35.98 | 32.09 | h | 45.50 | ||||||||||
| 1978 | 31.59 | d | 33.52 | e | 41.55 | b | 38.40 | 44.39 | 51.90 | a | 61.40 | a | 60.20 | a | 50.93 | b | 48.73 | e | 34.70 | h | 21.81 | e | 44.04 | |||
| 1979 | 21.30 | c | 28.71 | 35.90 | z | 38.26 | c | 47.75 | a | 55.40 | 62.61 | 60.83 | d | 58.17 | 48.43 | d | 31.11 | c | 32.47 | b | 44.09 | |||||
| 1980 | 26.29 | c | 35.78 | 31.63 | 41.98 | 47.65 | 50.68 | 62.93 | a | 59.31 | 56.58 | 47.65 | a | 37.58 | 34.89 | c | 44.41 | |||||||||
| 1981 | 33.45 | 30.80 | a | 34.85 | 41.95 | 47.06 | 54.85 | 60.82 | 63.60 | b | 54.87 | 40.95 | a | 36.48 | a | 32.30 | c | 44.33 | ||||||||
| 1982 | 26.95 | a | 29.00 | 31.27 | 35.62 | 45.47 | 53.98 | 59.63 | 62.10 | 51.28 | 43.26 | 30.02 | 27.21 | 41.32 | ||||||||||||
| 1983 | 32.88 | a | 32.73 | 34.82 | 36.23 | 47.71 | 52.47 | 56.74 | 62.18 | 52.40 | 47.05 | 34.25 | 26.03 | 42.96 | ||||||||||||
| 1984 | 30.95 | 29.97 | 35.87 | 36.88 | 48.08 | 51.08 | 64.65 | 62.95 | 53.72 | 39.84 | 33.42 | 25.58 | 42.75 | |||||||||||||
| 1985 | 26.42 | 27.39 | 31.32 | 45.02 | 48.42 | 57.68 | 67.61 | 59.55 | 47.57 | 43.71 | 27.55 | 29.56 | 42.65 | |||||||||||||
| 1986 | 37.71 | 34.93 | 40.74 | 40.70 | 48.16 | 60.25 | 58.66 | 66.35 | 47.88 | 46.19 | 37.35 | ----- | z | 47.18 | ||||||||||||
| 1987 | 26.85 | 32.48 | 35.26 | 47.18 | 50.44 | 59.65 | d | 58.73 | 61.89 | 57.95 | a | 50.35 | 35.14 | a | 27.00 | a | 45.24 | |||||||||
| 1988 | 27.98 | a | 36.41 | 35.68 | 43.77 | 47.79 | 56.33 | a | 64.32 | 61.69 | 54.73 | 52.08 | 32.82 | 28.15 | 45.15 | |||||||||||
| 1989 | 26.19 | 21.61 | 35.24 | 44.80 | 46.26 | 56.95 | 63.69 | 58.53 | 53.57 | 43.29 | 35.69 | c | 33.02 | 43.24 | ||||||||||||
| 1990 | 31.10 | 28.48 | 35.94 | 46.28 | 45.45 | 54.87 | 64.82 | 62.53 | 57.80 | 46.84 | 36.63 | 21.62 | a | 44.36 | ||||||||||||
| 1991 | 30.74 | 39.66 | 31.48 | 37.65 | 43.52 | 51.95 | 63.44 | 63.55 | 58.63 | 46.76 | 34.23 | o | 31.55 | 45.36 | ||||||||||||
| 1992 | 34.03 | 36.79 | 39.95 | 45.70 | 54.47 | 59.00 | 61.31 | 65.10 | 56.17 | 49.06 | 33.78 | 24.19 | 46.63 | |||||||||||||
| 1993 | 23.94 | 24.95 | 39.32 | 40.63 | 50.66 | 52.03 | 53.89 | 57.39 | 55.38 | 47.73 | 29.63 | 29.40 | 42.08 | |||||||||||||
| 1994 | 34.53 | 29.02 | 40.18 | 43.45 | 50.65 | 55.70 | 66.50 | 63.97 | 57.75 | 43.98 | 26.67 | 29.08 | 45.12 | |||||||||||||
| 1995 | 30.95 | 39.79 | 33.91 | n | 40.25 | 46.87 | 52.17 | j | 61.43 | a | 60.45 | 56.32 | 46.21 | 40.95 | 30.58 | 45.38 | ||||||||||
| 1996 | 31.53 | 31.72 | 37.40 | 42.17 | 45.79 | 55.77 | 65.21 | 63.68 | a | 52.92 | 45.27 | 38.30 | 32.52 | 45.19 | ||||||||||||
| 1997 | 30.39 | 29.61 | 38.43 | a | 39.47 | 52.69 | 54.67 | 61.53 | 62.26 | j | 56.03 | 44.67 | a | 37.86 | i | 27.38 | j | 45.28 | ||||||||
| 1998 | 31.35 | 30.15 | k | 34.80 | i | 40.50 | m | 42.28 | k | 53.11 | l | 67.79 | n | 66.19 | j | 62.54 | q | 44.25 | k | 34.96 | r | 28.50 | p | 31.35 | ||
| 1999 | 30.93 | p | 27.00 | n | 33.18 | l | 36.40 | o | 47.75 | k | 52.26 | k | 61.43 | i | 59.40 | j | 54.75 | b | 47.29 | n | 43.26 | k | 31.65 | k | 54.75 | |
| 2000 | 29.58 | s | 34.25 | m | 34.76 | n | 47.33 | r | 48.81 | w | 62.07 | g | 62.48 | g | 69.25 | u | 57.11 | p | 43.58 | y | 24.69 | v | 32.89 | v | 9999.00 | |
| 2001 | 28.33 | a | 27.33 | b | 37.46 | c | 36.62 | f | 52.69 | 55.44 | f | 61.90 | g | 65.87 | 57.32 | h | 47.50 | u | 37.17 | r | 30.28 | v | 42.34 | |||
| 2002 | 24.27 | r | 31.83 | s | 33.57 | q | 40.81 | n | 47.98 | d | 57.32 | 67.37 | 59.97 | 55.62 | 42.19 | 38.28 | l | 31.26 | 51.67 | |||||||
| 2003 | 39.24 | 28.68 | 37.70 | f | 36.38 | i | 47.90 | 57.80 | h | 69.23 | 64.32 | 58.12 | 50.55 | 31.30 | 32.30 | k | 48.67 | |||||||||
| 2004 | 30.55 | 29.60 | 42.81 | 43.02 | e | 47.84 | 57.02 | 65.26 | h | 64.47 | l | 53.58 | r | 43.62 | n | ----- | z | 32.36 | x | 41.81 | ||||||
| 2005 | 33.03 | n | 28.20 | r | 39.06 | v | 39.19 | n | 46.30 | i | 51.48 | h | 66.05 | l | 63.05 | l | 53.16 | k | 46.72 | m | 33.45 | s | 25.62 | r | 9999.00 | |
| 2006 | 32.68 | n | 33.00 | p | 31.79 | l | 39.81 | l | 48.07 | i | 60.47 | j | 70.42 | r | 60.25 | m | 56.32 | k | ----- | z | 34.84 | k | 30.21 | s | 9999.00 | |
| 2007 | 27.40 | j | 33.43 | g | 39.34 | l | 39.60 | j | 50.92 | l | 58.50 | l | 70.93 | k | 64.76 | h | ----- | z | 44.33 | h | 34.33 | g | 25.97 | n | 9999.00 | |
| 2008 | 23.40 | f | 29.53 | 32.80 | h | 36.62 | 47.66 | 54.02 | g | 64.93 | j | 63.80 | i | 56.85 | 50.77 | r | 41.52 | g | 27.11 | m | 42.67 | |||||
| 2009 | 31.17 | k | 30.66 | 30.75 | i | 38.77 | f | 49.74 | f | 54.70 | c | 64.35 | e | 62.45 | 59.80 | 42.71 | e | 33.89 | h | 24.32 | l | 52.45 | ||||
| 2010 | 33.33 | m | 30.34 | i | 33.23 | g | 36.94 | f | 42.38 | e | 51.80 | g | 62.37 | 61.37 | 54.70 | e | 45.53 | l | 32.89 | l | 31.45 | k | 55.21 | |||
| 2011 | 29.19 | m | 24.57 | g | 32.72 | d | 35.35 | 42.47 | 51.77 | 60.90 | 64.42 | 58.53 | 46.15 | 33.47 | 28.32 | 45.41 | ||||||||||
| 2012 | 30.19 | 29.36 | 33.98 | 42.27 | 47.69 | 53.92 | 66.16 | 66.31 | 60.12 | 45.40 | 37.40 | 26.53 | 44.94 | |||||||||||||
| 2013 | 25.82 | 28.80 | 36.84 | 48.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 7.50 | z | 30.49 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 28.71 | 31.16 | 34.25 | 40.10 | 47.55 | 54.50 | 62.69 | 61.87 | 54.97 | 45.90 | 35.38 | 29.72 | 43.88 | |||||||||||||
| S.D. | 4.46 | 3.96 | 3.61 | 3.70 | 3.07 | 3.02 | 2.69 | 2.52 | 3.14 | 2.88 | 3.72 | 3.89 | 1.25 | |||||||||||||
| SKEW | -0.70 | 0.12 | 0.32 | -0.32 | 0.11 | 0.45 | -0.44 | 0.10 | -0.46 | 0.07 | -0.06 | -0.05 | -0.43 | |||||||||||||
| MAX | 39.24 | 39.79 | 42.81 | 47.18 | 54.47 | 62.72 | 69.23 | 66.85 | 60.12 | 52.90 | 44.85 | 38.42 | 46.63 | |||||||||||||
| MIN | 11.53 | 21.61 | 27.52 | 31.62 | 41.37 | 48.47 | 53.89 | 56.44 | 47.57 | 39.65 | 26.67 | 21.56 | 40.78 | |||||||||||||
| NO YRS | 61 | 62 | 60 | 60 | 67 | 63 | 65 | 64 | 64 | 63 | 57 | 55 | 39 | |||||||||||||