| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1928 | ----- | z | 34.64 | a | 40.16 | 41.45 | 57.19 | 58.23 | 69.34 | 65.00 | 60.05 | 48.42 | 38.03 | 27.90 | 49.13 | |||||||||||
| 1929 | 20.18 | 23.59 | 39.00 | 41.23 | 52.66 | 57.47 | 65.61 | 69.82 | a | 56.47 | 52.02 | 40.57 | 36.48 | 46.26 | ||||||||||||
| 1930 | 13.77 | 36.43 | 39.90 | 49.45 | 50.03 | 55.77 | 68.02 | a | 68.19 | g | 58.88 | b | 44.69 | ----- | z | 27.37 | 44.43 | |||||||||
| 1931 | 32.85 | 33.12 | 38.69 | 46.28 | 56.89 | 58.68 | 68.89 | 67.73 | 56.72 | 48.11 | 32.40 | 26.56 | 47.24 | |||||||||||||
| 1932 | 28.84 | 30.29 | 37.47 | 45.10 | 51.58 | 61.52 | 63.19 | 65.50 | 60.65 | 49.68 | 40.88 | 25.71 | 46.70 | |||||||||||||
| 1933 | ----- | z | 25.12 | 35.24 | 46.08 | 46.97 | 59.07 | 69.05 | 68.79 | 53.45 | 52.06 | 41.10 | 35.40 | 48.39 | ||||||||||||
| 1934 | 37.71 | 39.32 | 46.48 | 53.47 | 56.23 | 61.03 | 67.84 | 69.94 | 57.65 | 49.65 | 40.08 | 31.27 | 50.89 | |||||||||||||
| 1935 | 30.00 | 35.39 | 34.73 | 42.32 | 53.02 | 58.38 | 66.60 | 65.11 | 63.53 | 47.98 | 35.68 | 29.15 | a | 46.82 | ||||||||||||
| 1936 | ----- | z | ----- | z | 36.16 | 49.72 | 58.00 | 61.00 | 67.55 | 67.05 | 59.23 | 54.81 | 37.84 | a | 34.44 | 52.58 | ||||||||||
| 1937 | 14.63 | 25.96 | 38.02 | 42.27 | 52.87 | 59.55 | 68.42 | 62.87 | 60.57 | 52.53 | 39.70 | 34.31 | 45.97 | |||||||||||||
| 1938 | 30.58 | 29.98 | 37.08 | 46.32 | 52.87 | 62.27 | 70.85 | 64.92 | 66.50 | 49.24 | 34.37 | 32.85 | 48.15 | |||||||||||||
| 1939 | 34.32 | 28.66 | 41.26 | 48.57 | 55.87 | 57.62 | a | 68.31 | 69.53 | 61.62 | 49.73 | 43.93 | 36.89 | 49.69 | ||||||||||||
| 1940 | 29.79 | 33.34 | 41.82 | 45.75 | ----- | z | 64.15 | 67.44 | 68.05 | 61.78 | 51.19 | 32.98 | 33.87 | 48.20 | ||||||||||||
| 1941 | 31.40 | 36.84 | 44.35 | 48.82 | 52.18 | 57.98 | 71.45 | 66.40 | 54.48 | 47.55 | a | 40.17 | 31.74 | 48.61 | ||||||||||||
| 1942 | 21.79 | 31.96 | 38.35 | 47.32 | 51.10 | 56.47 | 69.50 | 69.81 | 63.13 | 52.68 | 33.63 | 32.55 | 47.36 | |||||||||||||
| 1943 | 20.98 | 33.36 | 36.44 | 47.48 | 48.56 | ----- | z | ----- | z | ----- | z | 64.55 | b | 49.02 | 36.98 | d | 29.44 | 40.76 | ||||||||
| 1944 | 29.81 | 32.10 | 37.32 | 44.55 | 52.92 | 58.72 | 68.24 | d | 65.25 | k | 63.62 | a | 55.66 | 35.22 | u | 26.28 | a | 46.92 | ||||||||
| 1945 | 31.08 | 34.80 | 35.45 | 43.05 | 52.34 | 57.90 | 69.81 | 69.94 | 57.98 | 51.85 | 33.65 | 28.17 | a | 47.17 | ||||||||||||
| 1946 | 31.29 | 33.13 | a | 37.79 | 46.32 | 56.84 | c | 56.95 | 67.08 | a | 68.47 | b | 58.40 | a | 43.27 | a | 34.98 | 34.77 | 47.44 | |||||||
| 1947 | 28.25 | a | 37.41 | 43.47 | 48.48 | b | 59.79 | b | 57.48 | e | 66.40 | a | 65.50 | 61.38 | a | 47.44 | 37.50 | 33.40 | a | 48.87 | ||||||
| 1948 | 29.44 | 28.36 | 34.83 | b | 42.09 | a | 50.69 | e | 63.07 | a | 63.47 | a | 62.41 | h | 56.98 | c | 48.11 | 35.85 | 23.58 | 43.31 | ||||||
| 1949 | 15.37 | 28.62 | 38.40 | b | 49.25 | 58.15 | a | 61.67 | 65.95 | c | 65.81 | b | 61.33 | d | 46.33 | h | 41.66 | k | 30.21 | 47.48 | ||||||
| 1950 | 11.87 | 27.25 | 36.03 | 41.07 | 51.52 | a | 57.75 | 66.91 | b | 69.11 | 62.43 | 46.91 | c | 36.97 | 36.54 | h | 46.17 | |||||||||
| 1951 | 25.31 | 34.85 | h | 38.60 | e | 50.70 | b | 50.64 | x | 60.67 | a | 67.43 | d | 64.84 | f | 61.91 | b | 45.12 | a | 35.54 | d | 27.18 | c | 45.83 | ||
| 1952 | 24.54 | f | 33.06 | d | ----- | z | 50.40 | i | 53.00 | b | 56.33 | c | 69.07 | c | 65.95 | b | 59.38 | q | ----- | z | ----- | z | ----- | z | 55.48 | |
| 1953 | ----- | z | ----- | z | 38.83 | d | 43.50 | a | 49.35 | d | 52.35 | d | 66.48 | c | ----- | z | ----- | z | 47.94 | n | 40.50 | 35.44 | 46.64 | |||
| 1954 | 28.31 | 31.84 | 34.90 | 41.92 | 53.31 | 54.67 | ----- | z | ----- | z | ----- | z | ----- | z | 41.08 | r | 31.06 | 39.43 | ||||||||
| 1955 | 29.15 | 30.70 | 31.17 | a | 38.48 | 48.02 | 59.55 | 62.53 | a | 64.74 | f | 59.67 | 47.50 | 30.18 | 27.39 | 42.21 | ||||||||||
| 1956 | 28.82 | 25.24 | 35.52 | 47.60 | 55.77 | 54.63 | 68.71 | 66.48 | 60.03 | 45.27 | 33.72 | 33.23 | 46.25 | |||||||||||||
| 1957 | 16.87 | 30.50 | 36.45 | 45.65 | 55.68 | 59.43 | 62.74 | 62.03 | 61.82 | 44.81 | 37.93 | 35.53 | 45.79 | |||||||||||||
| 1958 | 32.48 | 39.68 | 36.42 | 42.97 | 62.93 | h | 63.95 | 72.44 | 71.58 | 58.32 | 52.81 | 35.40 | a | 35.47 | 49.23 | |||||||||||
| 1959 | 29.52 | 30.45 | 38.65 | 46.25 | 48.37 | 61.75 | 70.56 | ----- | z | 53.68 | 48.16 | l | 34.81 | a | ----- | z | 46.00 | |||||||||
| 1960 | 27.20 | a | 32.88 | 38.76 | 43.73 | 48.63 | 60.28 | 73.11 | 62.40 | b | 61.78 | 50.73 | 36.85 | 29.44 | 47.15 | |||||||||||
| 1961 | 32.61 | 36.48 | 38.10 | 44.08 | 50.61 | 65.20 | 70.81 | 73.26 | 56.28 | 46.94 | 33.60 | 30.77 | 48.23 | |||||||||||||
| 1962 | 29.52 | 34.16 | 35.76 | 47.98 | 47.58 | 58.15 | 66.95 | 63.82 | 62.35 | 49.27 | c | 38.83 | 34.61 | 47.42 | ||||||||||||
| 1963 | 23.97 | 40.68 | 38.00 | 41.00 | 50.79 | b | 57.37 | c | 60.98 | 67.15 | 64.12 | 49.95 | 37.43 | 29.55 | 46.75 | |||||||||||
| 1964 | 31.45 | 35.53 | 35.58 | 41.60 | 50.23 | 56.48 | 65.75 | a | 61.61 | 56.00 | 49.26 | 34.02 | 26.81 | 45.36 | ||||||||||||
| 1965 | 31.23 | 35.86 | 37.79 | 46.20 | 51.53 | 59.95 | 67.11 | ----- | z | 55.93 | 54.92 | 40.12 | 31.03 | 46.52 | ||||||||||||
| 1966 | 30.15 | 33.20 | 37.95 | 46.55 | a | 54.87 | 57.43 | 64.23 | 66.89 | 60.85 | 48.57 | c | 39.08 | 34.82 | 47.88 | |||||||||||
| 1967 | 34.98 | 37.39 | 36.48 | 38.82 | 51.82 | 62.27 | 67.78 | a | 73.15 | 65.74 | a | 47.84 | 39.00 | 30.37 | a | 48.80 | ||||||||||
| 1968 | 30.31 | 37.04 | c | 41.35 | 40.72 | c | 50.97 | b | ----- | z | 69.35 | 61.87 | 59.04 | b | 46.10 | 37.28 | a | 26.18 | a | 45.47 | ||||||
| 1969 | 19.16 | b | 28.46 | b | 37.97 | b | 43.60 | a | 55.18 | 64.07 | b | 65.00 | 63.53 | a | 59.10 | 45.03 | a | 39.33 | a | 29.74 | 45.85 | |||||
| 1970 | 28.47 | a | 36.34 | 37.93 | a | 39.83 | a | 51.40 | 63.87 | 70.40 | 68.95 | c | 54.57 | 49.66 | 38.28 | 29.53 | 47.44 | |||||||||
| 1971 | 34.82 | 35.02 | c | 33.76 | b | 42.93 | 54.76 | n | 56.50 | a | 69.85 | 71.95 | b | 53.55 | a | 45.92 | 37.16 | a | 27.45 | c | 46.26 | |||||
| 1972 | 27.29 | 32.66 | a | 40.40 | b | 40.09 | c | 53.26 | d | 58.12 | b | 66.22 | b | 69.03 | a | 54.73 | d | 48.35 | d | 37.83 | c | 24.89 | 46.07 | |||
| 1973 | 26.45 | 34.44 | a | 39.22 | b | 45.42 | 53.86 | c | 57.35 | f | 67.74 | d | ----- | z | 59.54 | b | 46.56 | d | 32.90 | 33.95 | b | 44.01 | ||||
| 1974 | 23.88 | c | 34.58 | h | 37.70 | f | 43.98 | b | 47.79 | b | 63.12 | a | 64.52 | d | 68.36 | b | 62.54 | b | 50.54 | c | 36.76 | e | 33.00 | a | 49.45 | |
| 1975 | 28.98 | b | 29.80 | 35.38 | g | 39.64 | b | 50.71 | b | 57.43 | h | 70.71 | 61.70 | c | 61.83 | d | 45.48 | a | 34.36 | b | 33.13 | d | 45.63 | |||
| 1976 | 33.84 | c | 31.30 | a | 33.27 | g | 43.48 | b | 51.16 | l | 55.15 | d | 66.06 | g | 63.79 | 62.66 | b | 50.03 | a | 39.67 | 34.21 | 46.02 | ||||
| 1977 | 25.20 | a | 34.78 | a | 38.77 | 49.50 | a | 47.29 | b | 64.07 | b | 64.98 | b | 71.64 | b | 54.53 | 48.95 | b | 34.10 | d | 29.94 | d | 46.98 | |||
| 1978 | 30.47 | 35.06 | a | 42.02 | b | 43.68 | e | 48.17 | d | 59.96 | f | 66.43 | a | 64.43 | a | 55.23 | d | 50.39 | 30.83 | 26.93 | c | 44.88 | ||||
| 1979 | 17.64 | b | 31.85 | d | 41.70 | d | 44.03 | a | 54.90 | a | 59.93 | a | 67.55 | a | 67.18 | a | 62.41 | b | 50.75 | a | 32.92 | 35.17 | d | 47.17 | ||
| 1980 | 22.20 | c | 32.16 | a | 37.42 | a | 46.89 | b | 50.88 | b | 53.62 | a | 65.05 | a | 62.29 | 59.39 | b | 50.31 | 38.34 | a | 36.61 | c | 46.26 | |||
| 1981 | 33.96 | d | 30.71 | i | 41.98 | d | 44.59 | h | 50.31 | e | 54.85 | c | 63.13 | 71.08 | a | 59.71 | d | 46.52 | g | 39.10 | d | 30.75 | c | 49.43 | ||
| 1982 | 28.45 | 30.82 | 37.37 | 39.95 | 50.39 | 61.88 | 64.45 | 65.65 | 56.68 | 45.47 | 32.47 | 28.68 | 45.19 | |||||||||||||
| 1983 | 35.85 | 36.41 | 41.10 | 43.90 | 54.34 | 56.07 | 61.98 | 68.08 | 54.93 | 48.50 | 39.02 | 20.55 | 46.73 | |||||||||||||
| 1984 | 32.24 | 34.53 | 41.24 | 41.02 | 47.56 | 54.93 | 67.69 | 66.87 | 55.33 | 43.53 | 34.75 | 26.53 | 45.52 | |||||||||||||
| 1985 | 22.56 | 28.54 | 36.45 | 46.42 | 52.97 | 60.05 | 73.55 | 64.37 | 53.13 | 45.44 | 23.68 | 20.56 | 43.98 | |||||||||||||
| 1986 | 33.40 | 33.46 | 43.77 | 43.50 | 52.82 | 65.18 | 61.92 | 72.45 | 54.37 | 52.50 | 36.76 | a | 28.31 | 48.20 | ||||||||||||
| 1987 | 28.35 | 35.46 | 40.21 | 49.77 | 56.06 | 62.38 | a | 64.63 | 67.26 | 64.57 | 54.52 | 40.08 | 28.23 | 49.29 | ||||||||||||
| 1988 | 28.02 | 36.74 | 39.61 | 47.55 | 50.94 | 58.60 | 67.29 | 67.27 | 60.43 | 56.95 | 37.60 | 31.48 | 48.54 | |||||||||||||
| 1989 | 32.42 | 23.12 | 36.37 | 48.05 | 51.89 | 62.13 | 65.35 | 63.84 | 61.40 | 48.48 | 40.77 | 33.11 | 47.25 | |||||||||||||
| 1990 | 32.98 | 30.55 | 41.23 | 49.62 | 50.81 | ----- | z | 69.02 | 67.71 | ----- | z | 45.65 | 39.78 | 21.56 | 44.89 | |||||||||||
| 1991 | 29.29 | 40.27 | ----- | z | 44.82 | 50.00 | 55.33 | 67.79 | 70.16 | 62.95 | 49.77 | 37.13 | 32.87 | 49.13 | ||||||||||||
| 1992 | 33.74 | 38.95 | 44.61 | 47.82 | 56.66 | 66.78 | ----- | z | 67.97 | 56.42 | 50.08 | 35.92 | 26.21 | 47.74 | ||||||||||||
| 1993 | 21.76 | 25.32 | 39.08 | a | 43.62 | 57.35 | 57.82 | 59.65 | 64.63 | 60.80 | 51.56 | 31.47 | 30.03 | 45.26 | ||||||||||||
| 1994 | 38.39 | 29.50 | 42.35 | 49.07 | 54.81 | 59.00 | ----- | z | 66.47 | 63.48 | 47.29 | ----- | z | 30.39 | 48.07 | |||||||||||
| 1995 | 31.03 | 38.74 | a | ----- | z | ----- | z | 54.47 | ----- | z | 66.31 | ----- | z | 62.60 | ----- | z | 41.50 | 30.60 | 46.46 | |||||||
| 1996 | 30.31 | 29.10 | ----- | z | 45.52 | 48.60 | 57.92 | 70.13 | 67.44 | 56.80 | 47.44 | 35.53 | 27.87 | 46.97 | ||||||||||||
| 1997 | 30.24 | 33.82 | ----- | z | 43.42 | 54.77 | 57.73 | ----- | z | ----- | z | ----- | z | 46.31 | ----- | z | 31.77 | 42.58 | ||||||||
| 1998 | 31.47 | 36.89 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.56 | ----- | z | ----- | z | 38.31 | ||||
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.59 | a | 27.26 | b | 28.92 | |
| 2001 | 29.11 | 31.25 | b | 40.15 | a | 41.65 | d | 54.26 | 56.83 | d | 66.35 | a | 69.47 | 61.83 | f | 47.29 | c | 38.11 | c | 29.08 | a | 45.78 | ||||
| 2002 | 31.29 | 33.14 | 34.76 | 44.33 | 49.19 | 60.36 | b | 66.88 | j | 61.74 | h | ----- | z | 45.44 | 37.27 | 31.84 | 40.85 | |||||||||
| 2003 | 33.76 | 34.68 | 41.29 | 42.33 | 49.71 | j | 60.85 | j | 73.75 | o | 68.11 | 59.02 | 49.65 | 32.73 | 30.98 | 43.62 | ||||||||||
| 2004 | 25.23 | 32.02 | 41.47 | 45.52 | 50.89 | 57.63 | 66.80 | f | 68.31 | 57.32 | 46.76 | ----- | z | 33.16 | 45.83 | |||||||||||
| 2005 | 28.94 | ----- | z | 40.06 | 44.25 | 52.26 | 56.88 | f | ----- | z | ----- | z | 54.48 | ----- | z | ----- | z | ----- | z | 44.00 | ||||||
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.73 | 26.73 | ||
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | 33.62 | 36.23 | 40.54 | d | 52.55 | 55.03 | a | 67.95 | 66.68 | 60.92 | ----- | z | 39.88 | 26.42 | 47.98 | |||||||||
| 2009 | 26.77 | 31.25 | 32.77 | 43.30 | 50.44 | 60.13 | 69.19 | 69.32 | 61.33 | 43.11 | 36.57 | 25.10 | 45.77 | |||||||||||||
| 2010 | 32.73 | 37.38 | 39.61 | 43.37 | 51.10 | 59.25 | 69.73 | 67.90 | 58.78 | 48.29 | 33.25 | 29.33 | a | 47.56 | ||||||||||||
| 2011 | 32.98 | 29.96 | 36.66 | 39.85 | 47.47 | 55.32 | 60.77 | 65.89 | 61.72 | 47.56 | 33.02 | 31.48 | 45.22 | |||||||||||||
| 2012 | 29.68 | 31.93 | 35.08 | 45.12 | 49.19 | 53.95 | 66.35 | 68.63 | 62.64 | a | 46.75 | a | 37.58 | 29.92 | 46.40 | |||||||||||
| 2013 | 26.48 | 35.16 | 38.92 | 51.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.52 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 28.36 | 32.88 | 38.50 | 44.70 | 52.22 | 59.03 | 67.11 | 67.14 | 59.44 | 48.73 | 36.51 | 30.21 | 47.06 | |||||||||||||
| S.D. | 5.54 | 3.91 | 2.88 | 3.19 | 3.02 | 3.15 | 2.92 | 2.89 | 3.35 | 2.98 | 3.36 | 3.71 | 1.39 | |||||||||||||
| SKEW | -1.06 | -0.34 | 0.25 | 0.23 | 0.31 | 0.30 | -0.30 | -0.01 | -0.17 | 0.50 | -0.77 | -0.37 | 0.39 | |||||||||||||
| MAX | 38.39 | 40.68 | 46.48 | 53.47 | 59.79 | 66.78 | 73.55 | 73.26 | 66.50 | 56.95 | 43.93 | 36.89 | 50.89 | |||||||||||||
| MIN | 11.87 | 23.12 | 31.17 | 38.48 | 46.97 | 52.35 | 59.65 | 61.61 | 53.13 | 43.11 | 23.68 | 20.55 | 43.98 | |||||||||||||
| NO YRS | 76 | 76 | 73 | 77 | 74 | 71 | 70 | 65 | 73 | 72 | 72 | 78 | 41 | |||||||||||||