| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1937 | -10.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.76 | 36.28 | a | 31.82 | 39.29 | |||
| 1946 | 32.45 | a | 33.93 | 37.29 | 44.47 | 52.05 | 55.17 | 63.57 | a | 62.40 | 54.00 | 41.60 | a | 34.45 | 35.44 | 45.57 | ||||||||||
| 1947 | 29.40 | 37.36 | 41.55 | 45.55 | 55.13 | 53.02 | 60.37 | 59.09 | d | 56.85 | 48.26 | 37.12 | 34.55 | a | 46.52 | |||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.95 | b | 59.32 | a | 52.37 | 45.72 | b | 35.72 | a | 23.35 | 45.91 | |||
| 1949 | 16.16 | c | 29.20 | a | 36.71 | 46.27 | 52.85 | 55.43 | 60.03 | 59.32 | c | 54.90 | 41.92 | a | 43.61 | b | 29.52 | 43.83 | ||||||||
| 1950 | 18.00 | a | 34.09 | 35.34 | b | 40.87 | c | 47.85 | 55.57 | b | 64.07 | a | 65.63 | 56.52 | a | 48.42 | 41.54 | b | 40.45 | b | 45.70 | |||||
| 1951 | 29.03 | 33.96 | a | 35.02 | 44.14 | b | 49.67 | a | 56.72 | c | 64.23 | a | 59.46 | d | 58.06 | d | 43.97 | b | 37.98 | e | 28.32 | f | 46.57 | |||
| 1952 | 29.11 | c | 36.97 | i | 33.95 | c | 46.98 | b | 49.16 | b | 54.84 | a | 65.26 | d | 63.30 | a | 59.83 | a | 52.77 | a | 33.34 | a | 31.19 | b | 47.25 | |
| 1953 | 40.08 | 35.20 | 38.50 | c | 41.10 | a | 45.55 | b | 50.43 | b | 61.81 | b | 60.20 | c | 58.27 | b | 47.50 | a | 42.37 | 36.21 | b | 46.43 | ||||
| 1954 | 29.85 | a | 39.50 | 32.81 | 43.02 | 50.53 | 53.23 | 62.55 | 57.13 | 54.02 | 45.23 | 43.35 | 32.63 | 45.32 | ||||||||||||
| 1955 | 30.52 | 30.66 | 32.97 | b | 36.43 | a | 45.98 | a | 56.53 | 59.23 | 61.32 | a | 54.76 | c | 47.34 | 33.88 | 30.74 | 43.36 | ||||||||
| 1956 | 32.16 | 29.75 | a | 36.90 | b | 45.02 | c | 52.92 | a | 53.67 | 64.18 | 60.87 | 56.67 | 44.74 | 36.93 | 37.18 | 45.91 | |||||||||
| 1957 | 18.82 | 34.27 | 38.48 | a | 43.80 | 52.18 | 57.35 | 59.84 | 57.56 | 58.38 | 44.34 | 35.23 | 36.58 | a | 44.74 | |||||||||||
| 1958 | 35.15 | 40.82 | 35.37 | 41.78 | 56.02 | 58.67 | 65.68 | 66.74 | 55.02 | 50.24 | 39.82 | 40.08 | 48.78 | |||||||||||||
| 1959 | 34.15 | a | 31.80 | 39.27 | 42.98 | 45.71 | 56.07 | 63.87 | 59.58 | 53.03 | 48.02 | 38.28 | 33.23 | 45.50 | ||||||||||||
| 1960 | 27.50 | 31.19 | 39.22 | a | 43.52 | 46.87 | 57.32 | 67.19 | 60.60 | 57.80 | 49.24 | 36.05 | 34.58 | 45.92 | ||||||||||||
| 1961 | 36.34 | 40.05 | 37.92 | 43.53 | 46.98 | a | 62.22 | 65.00 | 66.29 | 51.45 | 45.77 | 35.73 | 31.68 | c | 46.91 | |||||||||||
| 1962 | 30.22 | a | 34.80 | 34.97 | 46.19 | c | 43.95 | 52.92 | 58.74 | b | 57.88 | a | 56.23 | 46.97 | b | 41.41 | c | 37.04 | f | 45.84 | ||||||
| 1963 | 27.39 | d | 41.93 | e | 38.48 | d | 39.85 | d | 49.12 | c | 54.15 | c | 57.90 | e | 60.47 | a | 61.11 | b | 47.58 | 38.77 | 33.47 | 45.85 | ||||
| 1964 | 31.55 | a | 33.29 | a | 32.04 | d | 37.88 | a | 44.45 | c | ----- | z | 61.60 | b | 57.83 | d | 52.14 | a | 47.40 | a | 35.04 | b | 29.19 | g | 43.32 | |
| 1965 | 32.61 | d | 34.97 | i | ----- | z | 43.39 | b | 46.55 | 54.68 | 62.21 | c | 60.75 | c | 49.91 | b | 52.05 | b | 40.81 | a | 31.76 | 47.47 | ||||
| 1966 | 34.13 | a | 33.45 | 38.50 | a | 41.94 | d | 49.44 | 54.10 | a | 59.02 | j | 59.62 | b | 57.06 | c | 48.43 | a | 41.08 | d | 34.32 | a | 44.73 | |||
| 1967 | 34.78 | b | 37.81 | a | 34.68 | a | 36.80 | c | 48.92 | 57.40 | 64.66 | c | 68.07 | a | 61.03 | 49.10 | 38.30 | 30.47 | 46.83 | |||||||
| 1968 | 32.37 | 37.24 | 41.35 | 40.45 | 49.43 | c | 56.52 | b | 64.55 | 60.00 | a | 56.11 | b | 46.03 | a | 37.91 | a | 28.20 | d | 45.85 | ||||||
| 1969 | 23.34 | 29.20 | 36.37 | 42.60 | a | 52.95 | a | 59.03 | 61.82 | c | 60.57 | a | 55.80 | b | 43.39 | 40.33 | 33.70 | a | 44.93 | |||||||
| 1970 | 32.82 | 36.25 | b | 36.60 | e | 36.47 | 48.97 | 60.84 | b | 63.85 | 62.78 | b | 50.32 | 44.35 | a | 37.07 | a | 30.44 | 45.06 | |||||||
| 1971 | 33.87 | 34.28 | a | 35.33 | a | 40.47 | a | 48.53 | a | 52.98 | 65.05 | 66.61 | 51.41 | a | 42.29 | b | 37.81 | a | 29.35 | a | 44.83 | |||||
| 1972 | 30.76 | 35.81 | 41.61 | 39.74 | a | 50.97 | 57.72 | 63.78 | b | 63.41 | b | 52.37 | 44.58 | 38.54 | b | 25.34 | c | 45.38 | ||||||||
| 1973 | 28.93 | a | 35.74 | a | 37.43 | a | 42.67 | 52.02 | 57.20 | e | 64.33 | b | 61.71 | b | 56.65 | f | 46.13 | d | 35.43 | a | 35.69 | 45.21 | ||||
| 1974 | 26.32 | 35.20 | c | 37.34 | c | 40.27 | d | 45.82 | a | 60.88 | e | 60.03 | b | 62.10 | 57.50 | 47.65 | 39.57 | b | 33.58 | 45.52 | ||||||
| 1975 | 32.75 | a | 31.66 | 33.27 | c | 36.75 | 46.26 | d | 53.00 | e | 65.31 | b | 58.05 | b | 56.57 | b | 47.12 | b | 37.20 | c | 35.40 | b | 44.45 | |||
| 1976 | 35.55 | a | 33.19 | 35.53 | 40.47 | a | 48.04 | c | 50.35 | c | 61.30 | c | 58.79 | b | 56.69 | a | 46.25 | g | 40.79 | d | 33.32 | a | 44.91 | |||
| 1977 | 28.13 | d | 35.62 | 35.48 | h | 44.57 | b | 44.73 | e | 58.76 | c | 61.23 | c | 67.12 | c | 51.04 | d | 46.29 | b | 36.07 | b | 34.55 | c | 46.19 | ||
| 1978 | ----- | z | ----- | z | ----- | z | 41.88 | f | 46.28 | a | 56.70 | b | 62.50 | d | 60.41 | d | 52.26 | e | 47.46 | d | ----- | z | ----- | z | 54.27 | |
| 1979 | 15.43 | c | 34.75 | d | 39.67 | a | 41.26 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.83 | b | 33.41 | c | 37.42 | a | 35.97 | |
| 1980 | 27.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.77 | g | 39.55 | 39.52 | 35.65 | ||||
| 1981 | 32.38 | c | 34.98 | a | 38.62 | a | 40.98 | g | 46.63 | l | 50.50 | a | 55.98 | d | ----- | z | 50.63 | k | ----- | z | ----- | z | ----- | z | 42.49 | |
| 1982 | 25.55 | j | 31.83 | b | 35.85 | 38.12 | j | 44.95 | 55.58 | 59.03 | 60.20 | a | 49.43 | i | 40.08 | k | 31.07 | a | 29.15 | a | 43.46 | |||||
| 1983 | 34.72 | a | 34.84 | 38.45 | l | 37.22 | 48.06 | d | 51.78 | 59.62 | a | 64.53 | a | 51.62 | r | 43.32 | q | 37.53 | 23.84 | 43.57 | ||||||
| 1984 | 34.71 | 36.45 | 40.52 | 39.97 | 47.92 | a | 52.28 | 63.24 | 62.38 | c | 52.33 | a | 42.77 | a | 36.27 | f | 26.48 | b | 45.37 | |||||||
| 1985 | 28.18 | i | 31.57 | 34.98 | b | ----- | z | 43.91 | b | 57.23 | 67.02 | a | 66.16 | 51.07 | h | 44.05 | b | 23.10 | 24.38 | b | 43.60 | |||||
| 1986 | 37.34 | o | 36.23 | 43.78 | h | 41.37 | 50.72 | b | 61.33 | d | 58.40 | b | 66.26 | b | 52.26 | e | 48.06 | 39.10 | 32.44 | 48.62 | ||||||
| 1987 | ----- | z | 36.88 | 39.03 | 48.71 | b | 54.42 | f | 60.67 | c | 59.73 | a | 61.06 | 58.13 | 49.68 | 37.55 | a | 30.87 | a | 48.23 | ||||||
| 1988 | 30.68 | c | 38.14 | 39.77 | 45.65 | 48.02 | 55.98 | b | 63.26 | 61.26 | 55.15 | d | 54.45 | 37.55 | 33.10 | b | 46.92 | |||||||||
| 1989 | 32.85 | 23.82 | 38.62 | a | 47.92 | 48.39 | 58.09 | a | 59.50 | 58.66 | 53.62 | b | 46.08 | 40.04 | b | 35.55 | 45.26 | |||||||||
| 1990 | 34.47 | 32.82 | 40.76 | ----- | z | 45.66 | 55.88 | 65.32 | 62.94 | 59.68 | 46.26 | 38.85 | 23.40 | 46.00 | ||||||||||||
| 1991 | 31.03 | ----- | z | ----- | z | ----- | z | 45.60 | a | 50.58 | 62.76 | 64.79 | 57.47 | 47.18 | 40.22 | ----- | z | 49.95 | ||||||||
| 1992 | 36.85 | 40.14 | 41.52 | b | 45.91 | b | ----- | z | 60.82 | ----- | z | 62.34 | c | ----- | z | 50.24 | 37.23 | 26.67 | a | 44.64 | ||||||
| 1993 | 21.16 | 26.68 | 40.18 | 44.75 | 56.77 | i | 55.27 | b | 54.34 | 59.06 | o | 57.34 | n | 49.53 | 30.25 | 34.45 | 39.62 | |||||||||
| 1994 | 38.79 | 33.77 | 40.69 | 46.88 | 50.84 | 56.08 | 65.87 | 61.16 | 59.42 | 44.34 | 31.57 | 33.39 | 46.90 | |||||||||||||
| 1995 | 33.29 | 41.74 | a | 38.24 | 41.67 | 51.44 | 55.20 | 61.56 | 58.75 | a | 57.72 | 44.98 | 42.62 | 31.26 | 46.54 | |||||||||||
| 1996 | 32.05 | 31.66 | 38.90 | 44.95 | 45.65 | ----- | z | 64.98 | 63.71 | 52.87 | 44.76 | 38.52 | 33.98 | 44.73 | ||||||||||||
| 1997 | 32.40 | a | 33.46 | 39.94 | 41.47 | 52.73 | a | 52.65 | 60.74 | 63.71 | 56.07 | 44.26 | 39.40 | 31.52 | 45.70 | |||||||||||
| 1998 | 33.77 | 35.75 | 39.18 | a | 42.13 | 47.08 | 54.97 | 65.53 | 62.56 | 57.82 | 43.82 | 38.20 | 31.18 | a | 46.00 | |||||||||||
| 1999 | 34.87 | 34.46 | 36.52 | 39.98 | b | 46.07 | c | 52.95 | a | 60.75 | c | 62.86 | c | 53.59 | b | 47.33 | b | 43.85 | 33.55 | 45.56 | ||||||
| 2000 | 29.77 | 34.90 | c | 36.98 | b | 46.84 | b | 50.14 | b | 57.19 | a | 61.34 | b | 60.21 | c | 54.50 | 45.08 | 30.95 | 33.12 | b | 45.09 | |||||
| 2001 | 31.72 | a | 32.32 | 39.38 | b | 40.37 | 52.09 | b | ----- | z | 61.15 | 64.50 | b | 59.15 | 47.08 | 41.33 | a | 30.29 | 45.40 | |||||||
| 2002 | 33.05 | ----- | z | 35.55 | 43.13 | 47.55 | 58.75 | 65.08 | 59.32 | ----- | z | 41.73 | 38.95 | 33.26 | 45.64 | |||||||||||
| 2003 | 38.26 | 33.59 | 41.77 | 41.60 | 48.29 | e | ----- | z | 65.81 | 63.82 | 58.67 | 49.71 | 32.87 | 32.73 | 46.10 | |||||||||||
| 2004 | 31.24 | 35.09 | 43.23 | 44.82 | 48.61 | 54.68 | e | 64.29 | 64.82 | 53.55 | 46.82 | ----- | z | 36.08 | 47.57 | |||||||||||
| 2005 | 32.65 | 34.04 | 40.68 | 43.32 | 51.56 | 52.42 | 63.74 | 62.48 | 51.83 | 47.73 | ----- | z | 28.56 | 46.27 | ||||||||||||
| 2006 | 35.23 | 30.41 | 34.97 | ----- | z | 50.53 | k | 57.70 | ----- | z | 59.71 | 54.44 | e | 44.66 | 37.58 | 33.24 | 43.10 | |||||||||
| 2007 | ----- | z | 36.04 | 42.47 | 42.57 | 50.02 | 56.29 | a | 66.32 | 60.29 | 53.62 | 45.33 | e | 37.20 | 31.35 | 47.41 | ||||||||||
| 2008 | ----- | z | 35.81 | ----- | z | ----- | z | 49.39 | 52.98 | 62.23 | 62.28 | d | 54.90 | a | 47.28 | a | 41.67 | 26.87 | 48.16 | |||||||
| 2009 | 32.02 | 33.84 | 33.94 | 40.88 | 50.48 | 56.13 | 64.92 | 63.42 | ----- | z | ----- | z | ----- | z | ----- | z | 46.95 | |||||||||
| 2010 | 37.07 | b | 36.72 | a | 37.57 | a | 40.44 | d | 45.84 | 52.70 | 61.76 | 59.35 | 55.45 | 47.27 | 34.68 | 31.03 | 44.99 | |||||||||
| 2011 | 33.78 | a | 30.30 | 37.62 | a | 38.43 | 44.15 | d | 52.52 | c | 57.86 | b | 61.63 | 60.05 | 46.21 | 34.27 | b | 32.71 | 44.13 | |||||||
| 2012 | 33.47 | 32.17 | 36.15 | 42.58 | 47.30 | a | 52.10 | 62.10 | 62.79 | 56.61 | b | 46.08 | 39.67 | 29.84 | 45.07 | |||||||||||
| 2013 | 30.24 | 33.82 | 38.37 | 47.50 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.14 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.17 | 34.37 | 37.74 | 42.36 | 48.62 | 55.58 | 62.40 | 61.79 | 55.51 | 46.68 | 37.53 | 32.13 | 45.62 | |||||||||||||
| S.D. | 5.08 | 3.37 | 2.64 | 2.97 | 2.86 | 2.92 | 2.77 | 2.65 | 2.84 | 2.63 | 3.67 | 3.83 | 1.04 | |||||||||||||
| SKEW | -1.38 | -0.22 | -0.08 | -0.09 | 0.39 | 0.23 | -0.54 | 0.44 | 0.01 | 0.39 | -1.07 | -0.35 | 0.51 | |||||||||||||
| MAX | 40.08 | 41.93 | 43.23 | 48.71 | 56.02 | 62.22 | 67.19 | 68.07 | 61.11 | 54.45 | 43.85 | 40.45 | 48.78 | |||||||||||||
| MIN | 15.43 | 23.82 | 32.04 | 36.43 | 43.91 | 50.35 | 54.34 | 57.13 | 49.91 | 41.60 | 23.10 | 23.35 | 43.36 | |||||||||||||
| NO YRS | 60 | 61 | 59 | 57 | 59 | 60 | 62 | 63 | 56 | 62 | 62 | 61 | 33 | |||||||||||||