| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.47 | 48.69 | 38.13 | 24.76 | 42.76 | |||||
| 1925 | 37.53 | 39.73 | 41.08 | 49.08 | 54.76 | 59.52 | 68.35 | g | 65.40 | 57.78 | 48.00 | 40.62 | e | 36.63 | 48.19 | |||||||||||
| 1926 | 33.19 | ----- | z | ----- | z | 52.62 | 53.19 | 64.37 | 68.89 | 65.24 | 52.23 | 50.37 | 42.02 | 33.27 | 51.54 | |||||||||||
| 1927 | 28.15 | 37.14 | 38.81 | 43.87 | 49.19 | 60.92 | 66.37 | 65.89 | 55.57 | 50.18 | a | 43.17 | d | 25.98 | 47.10 | |||||||||||
| 1928 | 29.32 | c | 35.90 | 43.56 | 44.47 | a | 56.92 | 57.55 | 70.92 | 66.05 | a | 57.57 | 48.03 | 39.39 | b | 31.95 | 48.47 | |||||||||
| 1929 | 25.16 | 22.84 | 41.83 | a | 43.24 | a | 51.05 | c | 59.72 | a | 67.85 | 69.45 | a | 59.07 | 52.08 | 39.48 | 38.16 | 47.50 | ||||||||
| 1930 | 14.93 | a | 40.95 | 41.69 | 50.95 | 51.02 | 57.82 | 69.12 | c | 70.24 | 58.50 | 45.68 | 38.05 | 30.94 | 47.49 | |||||||||||
| 1931 | 36.11 | 35.06 | a | 38.81 | 45.04 | e | 58.39 | 60.03 | 71.03 | 70.63 | 57.53 | 49.32 | 35.65 | 30.98 | 49.05 | |||||||||||
| 1932 | 31.97 | 30.71 | 41.06 | 46.37 | 51.45 | 61.55 | 63.23 | 65.48 | 59.80 | 50.05 | 43.13 | 26.44 | 47.60 | |||||||||||||
| 1933 | 31.47 | 29.30 | 40.26 | 44.70 | 47.61 | 60.87 | 69.63 | a | 68.95 | 55.43 | 52.84 | 40.70 | 40.31 | 48.51 | ||||||||||||
| 1934 | 39.77 | 40.86 | 43.19 | 49.02 | ----- | z | 54.22 | ----- | z | 68.45 | 58.25 | 52.00 | 43.23 | 34.44 | 48.34 | |||||||||||
| 1935 | 32.44 | 37.61 | 38.03 | a | 44.18 | 52.34 | ----- | z | 68.05 | 65.52 | 62.68 | 48.66 | 35.81 | d | 31.03 | 46.94 | ||||||||||
| 1936 | 34.40 | 24.88 | 39.58 | 49.97 | 56.06 | 61.85 | 67.21 | 67.31 | 58.50 | a | 52.68 | 37.35 | 34.84 | 48.72 | ||||||||||||
| 1937 | 14.13 | 32.59 | 42.16 | 44.13 | 52.95 | 60.78 | 67.58 | 64.00 | 60.18 | 52.58 | 42.48 | 36.45 | 47.50 | |||||||||||||
| 1938 | 34.21 | 31.77 | 40.27 | 46.83 | 51.35 | 61.27 | 68.97 | 63.39 | 63.03 | 49.02 | 34.75 | 33.16 | 48.17 | |||||||||||||
| 1939 | 35.05 | 32.16 | 42.53 | 49.10 | 55.05 | 57.33 | 68.71 | 68.37 | 61.03 | 50.73 | 41.80 | 39.55 | 50.12 | |||||||||||||
| 1940 | 26.18 | 37.45 | 44.32 | 46.75 | 55.52 | 62.95 | 67.11 | 67.34 | 60.50 | 51.84 | 36.25 | 34.35 | 49.21 | |||||||||||||
| 1941 | 33.40 | 38.96 | 44.52 | 47.62 | 53.08 | 58.93 | 69.24 | 66.65 | 54.42 | 47.65 | 42.22 | a | 33.98 | 49.22 | ||||||||||||
| 1942 | 21.93 | a | 34.52 | 39.65 | 46.90 | 50.68 | 56.29 | a | 68.50 | 66.95 | 60.15 | 50.87 | 38.46 | b | 35.85 | 47.56 | ||||||||||
| 1943 | 24.27 | 36.12 | 39.18 | 48.45 | 49.62 | a | 55.57 | ----- | z | 61.78 | b | 62.70 | b | ----- | z | ----- | z | ----- | z | 47.21 | ||||||
| 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 | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.45 | 62.73 | 56.07 | a | 48.32 | c | 37.60 | 28.19 | 49.39 | |||||
| 1949 | 17.90 | 32.79 | 39.73 | a | 49.47 | 56.79 | 58.22 | 63.47 | 63.31 | 59.02 | 42.71 | 43.55 | b | 33.52 | 46.71 | |||||||||||
| 1950 | 19.85 | 33.07 | 38.50 | 43.98 | 50.00 | 58.87 | 66.16 | 65.45 | 58.87 | 49.40 | 40.57 | 39.87 | 47.05 | |||||||||||||
| 1951 | 30.97 | 35.88 | 37.63 | 48.00 | 52.97 | 60.65 | 67.03 | 63.69 | 59.55 | a | 46.97 | 38.57 | c | 30.13 | 47.67 | |||||||||||
| 1952 | 26.74 | 34.48 | 37.74 | 49.35 | 55.57 | c | 56.92 | 65.73 | a | ----- | z | ----- | z | 55.16 | 35.87 | d | 32.35 | 44.99 | ||||||||
| 1953 | 40.89 | 36.91 | a | 40.63 | 44.68 | 48.62 | c | 53.29 | d | 65.13 | 64.13 | a | 60.98 | b | 49.84 | b | 43.93 | a | 37.00 | 48.84 | ||||||
| 1954 | 32.47 | 40.07 | 37.47 | 46.08 | 54.63 | 55.98 | 65.12 | a | 60.75 | c | 56.15 | 47.00 | a | 45.18 | 33.81 | 47.89 | ||||||||||
| 1955 | 33.20 | a | 34.16 | 35.66 | 41.00 | 49.32 | 61.05 | 64.07 | a | 66.58 | 60.88 | b | 50.68 | 35.48 | a | 32.76 | 47.07 | |||||||||
| 1956 | 33.73 | a | 30.12 | 40.05 | 48.45 | 55.79 | 56.98 | 69.15 | a | 66.27 | 60.03 | 47.93 | a | 37.45 | 36.63 | 48.55 | ||||||||||
| 1957 | 20.37 | 35.54 | 40.18 | 46.97 | 55.82 | 60.50 | 64.31 | 62.53 | 62.38 | 46.56 | 38.17 | 39.00 | 47.69 | |||||||||||||
| 1958 | 36.06 | 43.68 | 39.02 | 45.27 | 59.61 | 63.27 | 71.35 | a | 72.10 | 59.79 | a | 53.68 | 41.23 | 40.24 | 52.11 | |||||||||||
| 1959 | 36.15 | 34.89 | 41.48 | d | 46.64 | b | 49.45 | b | 60.50 | 69.52 | 65.05 | b | 57.96 | e | 51.32 | 40.23 | 33.89 | 48.92 | ||||||||
| 1960 | 28.88 | b | 35.33 | 42.02 | 46.53 | 50.72 | a | 62.32 | b | 72.62 | b | 64.90 | b | 61.86 | a | 51.52 | c | 39.15 | c | 32.77 | a | 49.05 | ||||
| 1961 | 37.18 | 41.50 | 42.00 | b | 45.78 | 51.71 | 66.23 | 70.71 | b | 72.87 | 56.17 | 49.59 | c | 36.90 | a | 34.90 | b | 50.46 | ||||||||
| 1962 | 29.29 | b | 35.96 | a | 39.86 | f | 49.78 | c | 48.26 | 58.87 | 65.80 | c | 64.12 | b | 60.98 | a | 49.26 | b | 42.27 | b | 37.59 | c | 49.29 | |||
| 1963 | 27.82 | 43.00 | 40.21 | 42.57 | a | 53.64 | b | 57.45 | b | 62.83 | b | 66.83 | b | 65.39 | c | 52.05 | a | 41.53 | a | 34.10 | 48.95 | |||||
| 1964 | 35.26 | 36.91 | 38.52 | b | 42.83 | a | 50.82 | a | 59.28 | 67.94 | 64.08 | 58.65 | c | 51.17 | b | 36.75 | b | 31.95 | 47.85 | |||||||
| 1965 | 34.69 | 39.57 | a | 39.98 | 48.03 | 51.55 | 60.37 | c | 67.55 | b | 66.62 | c | 56.43 | a | 55.74 | b | 42.57 | b | 34.45 | b | 49.80 | |||||
| 1966 | 35.52 | 37.07 | a | 41.97 | 47.72 | 56.77 | 59.36 | b | 64.87 | d | 67.24 | 62.69 | a | 52.00 | a | 42.10 | 36.73 | 50.34 | ||||||||
| 1967 | 38.42 | a | 40.54 | 39.08 | a | 40.53 | a | 53.34 | 63.65 | d | 70.57 | d | 74.71 | 66.90 | a | 52.32 | c | 40.88 | b | 33.42 | 51.20 | |||||
| 1968 | 34.82 | a | 40.26 | 44.50 | 44.64 | a | 54.17 | b | 60.98 | f | 71.91 | c | 65.63 | 62.41 | c | 50.12 | b | 40.93 | c | 31.47 | a | 49.17 | ||||
| 1969 | 24.66 | 32.82 | 41.39 | 46.52 | 59.90 | b | 64.40 | d | 68.09 | d | 67.12 | c | 61.69 | a | 47.00 | 43.30 | c | 33.95 | a | 49.24 | ||||||
| 1970 | 34.24 | 38.61 | 40.81 | 41.82 | 54.84 | b | 66.66 | a | 71.75 | a | 70.18 | a | 56.29 | b | 48.83 | a | 40.25 | b | 33.42 | 49.81 | ||||||
| 1971 | 35.90 | 36.75 | 37.80 | a | 44.39 | b | 54.80 | d | 58.43 | c | 71.69 | b | 73.66 | 57.36 | e | 48.72 | b | 40.97 | 33.34 | b | 49.48 | |||||
| 1972 | 31.82 | a | 38.02 | 44.47 | a | 43.07 | 55.92 | e | 63.74 | c | 70.27 | a | 71.11 | 58.09 | g | 49.68 | c | 41.69 | c | 27.50 | a | 48.84 | ||||
| 1973 | 30.58 | a | 38.30 | a | 41.06 | 47.43 | a | 57.26 | 63.20 | e | 70.75 | c | 67.84 | b | 60.07 | i | 50.93 | a | 38.07 | a | 38.27 | 49.43 | ||||
| 1974 | 28.22 | b | 39.11 | 41.71 | 45.78 | 51.06 | 67.19 | a | 69.17 | b | 69.81 | 64.33 | c | 52.28 | b | 42.50 | a | 35.94 | 50.59 | |||||||
| 1975 | 35.19 | 34.70 | 37.55 | 41.09 | a | 52.48 | b | 59.79 | b | 70.84 | c | 64.37 | a | 63.57 | c | 49.55 | b | 41.04 | d | 36.83 | b | 48.92 | ||||
| 1976 | 37.26 | 36.12 | 38.84 | 44.95 | a | 53.89 | d | 57.76 | c | 69.31 | d | 64.23 | a | 63.89 | b | 51.84 | c | 45.29 | f | 36.40 | a | 50.41 | ||||
| 1977 | 30.98 | 39.84 | 39.79 | 51.72 | 48.98 | b | 66.24 | e | 67.48 | b | 73.11 | 56.70 | g | 51.91 | c | 38.53 | 35.03 | 49.42 | ||||||||
| 1978 | 34.92 | 39.88 | 45.61 | 45.16 | a | 49.82 | f | 62.75 | 68.66 | b | 65.86 | b | 55.95 | 50.26 | 31.83 | 28.15 | 48.09 | |||||||||
| 1979 | 16.68 | 35.29 | 44.06 | e | 44.78 | 53.69 | 59.68 | 67.08 | 65.26 | f | 63.65 | t | ----- | z | ----- | z | ----- | z | 45.89 | |||||||
| 1980 | 15.78 | v | 35.34 | 38.65 | 47.37 | 51.45 | 54.80 | 65.48 | 61.15 | 58.37 | 47.79 | 39.08 | 35.87 | a | 48.67 | |||||||||||
| 1981 | 32.81 | 34.52 | 40.42 | 45.22 | 51.23 | 56.55 | 63.00 | 67.95 | 58.90 | 45.66 | 39.92 | 33.18 | 47.45 | |||||||||||||
| 1982 | 27.34 | 33.62 | 38.92 | 42.02 | 50.18 | 61.28 | 64.50 | 65.55 | 55.62 | 44.81 | 33.78 | a | 32.18 | 45.82 | ||||||||||||
| 1983 | 36.65 | 40.05 | 43.79 | 43.63 | 54.13 | 56.63 | 61.00 | 67.31 | 55.43 | 50.29 | 40.98 | 23.45 | a | 47.78 | ||||||||||||
| 1984 | 32.97 | 37.36 | 42.65 | 42.35 | 49.82 | 55.83 | 67.08 | 67.08 | 56.68 | 44.87 | 37.75 | 28.44 | 46.91 | |||||||||||||
| 1985 | 27.18 | 31.71 | 38.35 | 48.50 | 52.61 | 59.35 | 71.02 | 63.18 | 52.77 | 46.68 | 26.83 | 21.60 | 44.98 | |||||||||||||
| 1986 | 35.50 | 36.43 | 45.71 | 43.23 | 53.13 | a | 65.33 | 61.71 | 70.73 | 53.47 | 50.23 | 39.12 | 31.39 | 48.83 | ||||||||||||
| 1987 | 29.60 | 36.68 | 40.92 | 50.41 | a | 55.27 | 62.70 | 64.06 | 65.52 | 62.35 | 54.15 | 40.30 | 31.08 | 49.42 | ||||||||||||
| 1988 | 31.13 | 38.24 | 40.50 | 48.75 | 51.40 | 58.57 | 67.84 | 65.90 | 59.33 | 57.53 | 40.05 | 33.24 | 49.37 | |||||||||||||
| 1989 | 34.65 | 25.11 | 40.23 | 49.98 | 51.52 | 60.70 | 64.58 | 63.00 | 59.50 | 48.60 | 42.10 | 34.24 | 47.85 | |||||||||||||
| 1990 | 35.52 | 34.36 | 42.05 | 51.28 | 50.60 | 59.93 | 70.21 | 68.94 | 64.50 | 48.32 | 41.50 | 25.23 | 49.37 | |||||||||||||
| 1991 | 31.98 | 43.11 | 38.61 | 44.27 | 49.26 | 54.25 | 67.73 | 69.95 | 62.80 | 50.87 | 40.03 | 34.05 | 48.91 | |||||||||||||
| 1992 | 36.40 | 41.26 | 45.37 | 48.98 | 56.79 | 64.75 | 65.76 | 68.37 | 58.13 | 52.15 | 37.68 | 28.56 | 50.35 | |||||||||||||
| 1993 | 23.45 | 27.14 | 41.65 | 44.35 | 57.08 | 56.82 | 57.81 | 62.81 | 60.03 | 52.13 | 31.87 | 32.98 | 45.68 | |||||||||||||
| 1994 | 37.97 | 32.86 | 43.66 | 48.35 | 54.90 | 58.58 | 69.23 | 65.90 | 63.30 | 47.48 | 34.33 | 33.31 | 49.16 | |||||||||||||
| 1995 | 32.68 | 40.46 | 40.29 | 44.10 | 52.82 | 57.97 | 65.94 | 62.66 | 61.70 | 47.16 | 43.18 | 32.21 | 48.43 | |||||||||||||
| 1996 | 33.76 | 30.91 | 40.19 | 46.53 | 48.39 | 57.97 | 69.02 | 67.18 | 55.90 | 48.00 | 38.87 | 33.16 | 47.49 | |||||||||||||
| 1997 | 32.23 | 34.68 | 41.98 | 43.78 | 56.16 | 57.75 | 65.35 | 68.45 | 60.15 | 47.42 | 40.67 | 32.21 | 48.40 | |||||||||||||
| 1998 | 35.31 | 38.43 | 41.44 | 44.48 | 49.53 | 57.57 | 70.29 | 67.35 | 62.88 | 46.10 | 40.00 | 31.48 | 48.74 | |||||||||||||
| 1999 | 35.48 | 36.38 | 39.23 | 42.15 | 48.95 | 57.40 | 64.48 | 67.15 | 58.40 | 49.27 | 44.42 | 33.78 | a | 48.09 | ||||||||||||
| 2000 | 30.37 | 35.78 | 39.31 | 47.95 | 52.00 | 60.37 | 65.11 | ----- | z | 57.55 | 47.26 | 32.10 | 31.47 | 45.39 | ||||||||||||
| 2001 | 32.16 | 32.64 | 41.34 | 42.22 | ----- | z | ----- | z | 67.12 | a | 70.46 | d | 63.30 | h | ----- | z | ----- | z | ----- | z | 47.66 | |||||
| 2002 | 32.52 | 37.11 | 36.32 | 46.03 | 51.27 | 62.33 | 70.92 | 65.27 | 59.35 | ----- | z | 40.53 | 34.97 | 48.78 | ||||||||||||
| 2003 | 38.40 | 35.73 | 42.73 | e | 43.22 | 52.31 | 62.88 | 72.19 | 68.34 | 63.33 | f | 52.85 | 34.23 | d | 34.22 | d | 48.83 | |||||||||
| 2004 | 29.15 | 35.56 | e | 44.82 | f | 46.32 | e | 51.88 | c | 59.31 | d | 69.52 | 69.23 | e | 58.69 | l | 49.81 | 38.62 | 35.73 | 48.51 | ||||||
| 2005 | 33.74 | d | ----- | z | 42.53 | 44.12 | 53.96 | e | 56.85 | 68.77 | 68.58 | ----- | z | 49.55 | 36.17 | ----- | z | 50.47 | ||||||||
| 2006 | 37.44 | 31.55 | ----- | z | ----- | z | 54.39 | ----- | z | 71.29 | 66.90 | 60.81 | c | ----- | z | 39.69 | f | 32.31 | 50.67 | |||||||
| 2007 | ----- | z | 37.27 | d | 43.73 | i | 44.43 | h | 54.26 | h | 60.15 | c | 71.87 | a | 65.47 | a | 57.78 | g | 48.50 | p | 38.08 | e | 34.39 | i | 54.57 | |
| 2008 | 29.48 | g | 37.62 | p | 37.62 | g | 40.14 | h | 55.13 | h | 61.03 | o | 69.64 | m | 67.00 | r | 61.44 | d | 50.18 | a | 43.59 | h | 28.31 | d | 46.65 | |
| 2009 | 29.98 | f | 35.43 | g | 35.35 | g | 43.72 | g | ----- | z | 60.78 | 78.71 | 67.69 | d | ----- | z | 43.37 | 38.67 | 26.27 | 52.58 | ||||||
| 2010 | 36.87 | 36.45 | 39.58 | 41.87 | 47.10 | 54.73 | 65.06 | 63.92 | 57.33 | 48.87 | 35.87 | 32.45 | 46.68 | |||||||||||||
| 2011 | 34.08 | 29.61 | 38.29 | 38.45 | 45.83 | a | 54.53 | 61.58 | 66.73 | a | 62.42 | 48.48 | b | 37.76 | a | 35.78 | a | 46.13 | ||||||||
| 2012 | 38.23 | 37.29 | 39.31 | 46.20 | 51.05 | b | 56.77 | 67.98 | a | 69.50 | a | 63.20 | b | 50.36 | f | 41.93 | b | 33.83 | e | 49.57 | ||||||
| 2013 | 29.36 | b | 36.52 | c | 41.37 | a | 52.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.75 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.61 | 35.80 | 40.72 | 45.88 | 52.70 | 59.73 | 67.66 | 66.78 | 59.50 | 49.69 | 39.22 | 33.05 | 48.42 | |||||||||||||
| S.D. | 5.69 | 4.05 | 2.20 | 2.89 | 2.98 | 3.16 | 3.27 | 2.92 | 3.05 | 2.68 | 3.30 | 3.80 | 1.38 | |||||||||||||
| SKEW | -1.20 | -0.76 | 0.27 | 0.05 | 0.17 | 0.29 | -0.08 | 0.40 | -0.08 | 0.06 | -0.95 | -0.64 | 0.04 | |||||||||||||
| MAX | 40.89 | 43.68 | 45.71 | 52.62 | 59.90 | 67.19 | 78.71 | 74.71 | 66.90 | 57.53 | 45.18 | 40.31 | 52.11 | |||||||||||||
| MIN | 14.13 | 22.84 | 35.66 | 38.45 | 45.83 | 53.29 | 57.81 | 60.75 | 52.23 | 42.71 | 26.83 | 21.60 | 44.98 | |||||||||||||
| NO YRS | 80 | 80 | 77 | 79 | 77 | 78 | 80 | 80 | 74 | 78 | 79 | 80 | 57 | |||||||||||||