| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1917 | 24.00 | s | 27.82 | 26.55 | 38.73 | 46.77 | 55.77 | 66.10 | 60.68 | 54.70 | 49.13 | 25.90 | 20.10 | 42.93 | ||||||||||||
| 1918 | 22.94 | 32.93 | 40.06 | 41.33 | 38.55 | 51.43 | 50.00 | 53.77 | 47.10 | 39.45 | 27.03 | a | 18.26 | 38.57 | ||||||||||||
| 1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 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 | ----- | 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 | 23.43 | 30.68 | 27.06 | |||
| 1939 | 28.74 | 27.18 | 34.06 | 40.63 | 44.81 | 50.60 | 58.55 | 57.48 | 46.87 | 33.74 | 38.93 | 25.97 | 40.63 | |||||||||||||
| 1940 | 30.84 | ----- | z | 33.84 | 42.47 | 47.23 | 53.47 | 53.65 | 54.52 | 47.83 | 39.19 | 26.10 | 29.29 | 41.67 | ||||||||||||
| 1941 | 30.77 | 34.36 | 34.81 | 36.97 | 46.65 | 47.93 | 55.26 | 54.19 | 43.43 | 38.81 | 29.33 | 27.61 | 40.01 | |||||||||||||
| 1942 | 24.94 | 25.57 | 29.26 | 40.10 | 42.13 | 50.37 | 59.20 | a | 57.03 | 42.87 | 43.10 | ----- | z | 24.09 | i | 41.46 | ||||||||||
| 1943 | 25.10 | 32.64 | 39.55 | 42.33 | 44.71 | 45.07 | 52.74 | 55.87 | 49.57 | 41.50 | a | 26.13 | 29.42 | 40.39 | ||||||||||||
| 1944 | 25.74 | 30.10 | 32.45 | 37.57 | 44.71 | 46.60 | 50.65 | 53.32 | 49.43 | 38.74 | 33.00 | 23.74 | 38.84 | |||||||||||||
| 1945 | 24.26 | 30.43 | 31.55 | 37.33 | 45.55 | 52.60 | 61.48 | 60.90 | 52.93 | 42.35 | 28.20 | 23.74 | 40.94 | |||||||||||||
| 1946 | 23.26 | 25.04 | 33.29 | 40.23 | 45.77 | 53.23 | 59.29 | 63.71 | 52.90 | 38.29 | 30.90 | 29.48 | 41.28 | |||||||||||||
| 1947 | 22.19 | 30.21 | 37.55 | 41.33 | 50.16 | 53.17 | 56.84 | 59.55 | 55.60 | 43.87 | 26.77 | 26.13 | 41.95 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.70 | h | 54.74 | 51.10 | 42.87 | 26.50 | 24.03 | 39.85 | ||||||
| 1949 | 16.94 | 25.14 | 34.06 | 40.97 | a | 45.66 | b | 53.80 | 58.23 | 53.84 | 51.20 | 38.84 | 36.47 | 23.10 | a | 39.85 | ||||||||||
| 1950 | 22.61 | 32.46 | 35.39 | 42.20 | 44.10 | 49.73 | 60.71 | 56.16 | 50.97 | 46.29 | 36.70 | 32.58 | 42.49 | |||||||||||||
| 1951 | 28.97 | 31.11 | 34.03 | 42.07 | 48.00 | 51.93 | 61.03 | 57.94 | 53.57 | 43.97 | 33.37 | 28.84 | 42.90 | |||||||||||||
| 1952 | 28.13 | 31.28 | 33.65 | 40.53 | 47.42 | 46.80 | 58.74 | 59.68 | 55.40 | 46.77 | 32.60 | 31.03 | 42.67 | |||||||||||||
| 1953 | 32.48 | 26.68 | 33.23 | 39.27 | 40.77 | 49.73 | 63.03 | 56.29 | 53.13 | 41.39 | 36.53 | 24.32 | 41.41 | |||||||||||||
| 1954 | 30.26 | 33.25 | 34.90 | 42.70 | 48.29 | 53.00 | 63.55 | 55.74 | 51.47 | 41.90 | 37.60 | 27.39 | 43.34 | |||||||||||||
| 1955 | 28.03 | 26.29 | 32.90 | 37.13 | 45.87 | 52.47 | 57.65 | 63.71 | 54.37 | 44.32 | 33.90 | 33.65 | 42.52 | |||||||||||||
| 1956 | 33.13 | 28.48 | 32.74 | 40.10 | 46.06 | 54.37 | 59.32 | 54.23 | 55.37 | 42.68 | 28.47 | 25.61 | 41.71 | |||||||||||||
| 1957 | 28.58 | 37.96 | 38.23 | 40.90 | 45.10 | 55.90 | 61.42 | 60.03 | 53.13 | 44.19 | 33.87 | 30.32 | 44.14 | |||||||||||||
| 1958 | 29.16 | 38.07 | 34.52 | 40.37 | 49.23 | 53.87 | 58.87 | 63.16 | 54.60 | 46.48 | 33.73 | 30.00 | 44.34 | |||||||||||||
| 1959 | 30.55 | 31.43 | 36.97 | 45.17 | 46.39 | 57.50 | 66.03 | 60.61 | 52.77 | 45.58 | 35.27 | 31.84 | 45.01 | |||||||||||||
| 1960 | 29.10 | 32.28 | 39.39 | 42.90 | 47.61 | 59.43 | 63.03 | 60.29 | 57.76 | a | 44.23 | 34.50 | 27.00 | 44.79 | ||||||||||||
| 1961 | 26.16 | 32.04 | 35.58 | 42.33 | 45.83 | a | 57.63 | 63.13 | 61.97 | 52.13 | 43.84 | 33.90 | 29.10 | 43.64 | ||||||||||||
| 1962 | 28.16 | 35.50 | 33.32 | 43.77 | 44.84 | 53.20 | 58.55 | 59.39 | 53.53 | 44.87 | 36.03 | 28.48 | 43.30 | |||||||||||||
| 1963 | 26.16 | 39.32 | 35.00 | 39.00 | 48.84 | 53.67 | 58.35 | 60.74 | 57.20 | 49.45 | 36.83 | 27.23 | 44.32 | |||||||||||||
| 1964 | 27.27 | a | 27.69 | 34.48 | 41.03 | 46.19 | 53.43 | 60.58 | 61.32 | 51.27 | 50.06 | 33.67 | 34.90 | 43.49 | ||||||||||||
| 1965 | 31.00 | 32.50 | 38.68 | 42.83 | 47.87 | 50.90 | 59.24 | b | 61.61 | 50.10 | 45.77 | 40.40 | 30.90 | 44.32 | ||||||||||||
| 1966 | 27.74 | 29.46 | 37.13 | 43.07 | 50.13 | 55.50 | 60.00 | 61.72 | b | 55.13 | 44.39 | 38.40 | 30.81 | 44.46 | ||||||||||||
| 1967 | 29.90 | 31.50 | 39.45 | 36.53 | 48.81 | 53.13 | 65.65 | 66.13 | 57.67 | 45.87 | 41.53 | 28.48 | 45.39 | |||||||||||||
| 1968 | 28.47 | a | 39.31 | 37.10 | 41.27 | 48.19 | 54.57 | 63.23 | 57.81 | 53.07 | 44.81 | 36.97 | 26.58 | 44.28 | ||||||||||||
| 1969 | 36.13 | 33.89 | 35.94 | 41.90 | 50.26 | 53.83 | 61.77 | 62.13 | 57.07 | 40.90 | 35.60 | 30.06 | 44.96 | |||||||||||||
| 1970 | 31.10 | 35.21 | 36.97 | 36.30 | 48.10 | 55.90 | 64.65 | 64.65 | 50.37 | 42.16 | 37.50 | 30.84 | 44.48 | |||||||||||||
| 1971 | 29.10 | 31.68 | 35.74 | 38.67 | 44.48 | 52.40 | 60.74 | 62.81 | 53.83 | 38.87 | 32.38 | a | 26.71 | 42.28 | ||||||||||||
| 1972 | 25.45 | 33.03 | 41.13 | 41.47 | 48.29 | 56.40 | 63.87 | 60.35 | 54.73 | 45.16 | 34.63 | 27.65 | 44.35 | |||||||||||||
| 1973 | 28.03 | 35.57 | 34.97 | 40.57 | 50.32 | 56.50 | 59.52 | 60.97 | 50.50 | 42.90 | 36.07 | 30.10 | 43.83 | |||||||||||||
| 1974 | 30.42 | 28.86 | 37.71 | 38.27 | 48.32 | 55.70 | 62.74 | 58.10 | 58.47 | 45.74 | 33.60 | 28.35 | 43.86 | |||||||||||||
| 1975 | 28.29 | 31.11 | 35.35 | 36.90 | 46.74 | 54.30 | 60.71 | 58.19 | 57.27 | 43.35 | 31.93 | 29.68 | 42.82 | |||||||||||||
| 1976 | 27.61 | 34.66 | 35.45 | 39.13 | 50.32 | 54.20 | 61.52 | 55.19 | 57.30 | 44.77 | 37.30 | 26.23 | 43.64 | |||||||||||||
| 1977 | 30.97 | 32.43 | 32.03 | 42.13 | 45.19 | 56.97 | 60.97 | 62.74 | 54.77 | 46.35 | 36.23 | 36.58 | 44.78 | |||||||||||||
| 1978 | 34.74 | 35.79 | 41.35 | 40.60 | 46.68 | 55.67 | 58.87 | 58.52 | 52.53 | 48.42 | 33.90 | 26.16 | 44.44 | |||||||||||||
| 1979 | 30.45 | 29.29 | 36.10 | 40.83 | 48.42 | 54.62 | a | 59.29 | 57.97 | a | 57.20 | 47.06 | 32.30 | 30.29 | 43.65 | |||||||||||
| 1980 | 35.81 | 36.90 | 36.68 | c | 41.67 | 46.52 | 52.37 | 62.06 | 60.90 | 53.17 | 44.97 | 35.60 | 31.81 | 44.87 | ||||||||||||
| 1981 | 34.77 | 34.68 | 38.32 | 44.23 | 50.29 | 59.00 | 60.81 | 62.74 | 57.53 | 42.81 | 38.07 | 33.52 | 46.40 | |||||||||||||
| 1982 | 29.00 | 36.25 | 36.71 | 41.70 | 49.16 | 52.90 | 60.55 | 62.32 | 56.10 | 42.68 | 35.33 | 31.19 | 44.49 | |||||||||||||
| 1983 | 30.77 | 36.43 | 39.87 | 38.80 | 47.55 | 52.97 | 57.48 | 62.29 | 59.43 | 47.29 | 37.67 | 34.94 | 45.46 | |||||||||||||
| 1984 | 30.29 | 31.72 | 38.23 | 40.53 | 53.13 | 55.87 | 65.65 | 63.68 | 60.27 | 42.35 | 35.17 | 30.26 | 45.59 | |||||||||||||
| 1985 | 29.00 | 31.07 | 34.39 | 45.13 | 47.84 | 55.67 | 62.77 | 56.81 | 50.70 | 44.19 | 35.27 | 30.19 | 43.59 | |||||||||||||
| 1986 | 35.23 | 38.11 | 41.19 | 43.13 | 48.68 | 56.30 | 59.19 | 62.74 | 49.77 | 43.16 | 37.10 | 29.74 | 45.36 | |||||||||||||
| 1987 | 27.00 | 33.18 | 36.06 | 44.20 | 47.68 | 53.97 | 52.52 | 58.94 | 53.33 | 50.26 | 36.63 | 29.65 | 43.62 | |||||||||||||
| 1988 | 31.06 | 33.93 | 35.90 | 43.30 | 47.16 | 54.23 | 63.58 | 60.61 | 53.97 | 49.74 | 37.73 | 29.45 | 45.06 | |||||||||||||
| 1989 | 28.58 | 33.04 | 39.55 | 46.53 | 50.00 | 53.90 | 61.81 | 58.16 | 53.83 | 43.35 | 35.30 | 29.03 | 44.42 | |||||||||||||
| 1990 | 30.52 | 32.07 | 37.26 | 45.33 | 47.06 | 56.47 | 62.81 | 59.45 | 54.60 | 45.45 | 34.47 | 22.84 | 44.03 | |||||||||||||
| 1991 | 30.71 | 36.82 | 35.23 | 41.10 | 44.81 | 52.00 | 60.16 | 60.03 | 57.93 | 48.71 | 36.90 | 31.52 | 44.66 | |||||||||||||
| 1992 | 28.00 | 37.93 | 39.55 | 44.63 | 50.35 | 52.33 | 58.58 | 60.97 | 54.63 | 47.26 | 32.53 | 28.68 | 44.62 | |||||||||||||
| 1993 | 31.90 | 36.32 | ----- | z | 41.80 | 48.58 | 52.73 | 56.52 | ----- | z | 51.87 | 45.35 | 34.00 | 27.74 | 42.68 | |||||||||||
| 1994 | 30.26 | 26.50 | x | 41.65 | 45.63 | 48.52 | 58.13 | 63.55 | 63.35 | 56.53 | 44.65 | 30.80 | 31.68 | 46.80 | ||||||||||||
| 1995 | 37.16 | 39.46 | 40.13 | 41.77 | 47.39 | 54.67 | 59.94 | 62.19 | 57.60 | 45.29 | 40.63 | 33.74 | 46.66 | |||||||||||||
| 1996 | 35.42 | 39.52 | 39.71 | 44.23 | 52.10 | 56.67 | 65.55 | 63.68 | 55.23 | 45.16 | 37.27 | 35.06 | 47.47 | |||||||||||||
| 1997 | 36.58 | 34.29 | 39.16 | 44.43 | 55.13 | 57.97 | 59.32 | 61.45 | 60.53 | 44.52 | 39.17 | 30.94 | 46.96 | |||||||||||||
| 1998 | 35.26 | 36.64 | 38.77 | 39.87 | 45.71 | 52.97 | 61.58 | 64.29 | 56.27 | 42.42 | 36.00 | 29.10 | 44.91 | |||||||||||||
| 1999 | 33.23 | 33.86 | 36.77 | 40.69 | d | 48.90 | a | 54.62 | a | 61.19 | 58.90 | 56.20 | 45.58 | 37.77 | 29.13 | 44.74 | ||||||||||
| 2000 | 36.39 | 37.83 | 39.39 | 45.50 | b | 50.15 | r | 54.60 | y | 58.22 | v | 60.45 | t | 54.88 | e | 46.74 | 31.30 | 32.19 | 40.53 | |||||||
| 2001 | 30.48 | 33.96 | 40.94 | 41.67 | 55.32 | 59.60 | 61.68 | 63.71 | 57.70 | 49.45 | 39.47 | 30.90 | a | 47.07 | ||||||||||||
| 2002 | 29.81 | 32.64 | 35.84 | 44.57 | 49.06 | 57.80 | 64.45 | 60.03 | 57.00 | 44.90 | 38.10 | 32.16 | 45.53 | |||||||||||||
| 2003 | 35.42 | 34.93 | 39.94 | 41.83 | 50.16 | 56.53 | 66.06 | 64.03 | 58.17 | 49.58 | 35.20 | 31.13 | 46.92 | |||||||||||||
| 2004 | 32.42 | 32.00 | 42.90 | 44.80 | 50.68 | 57.13 | 62.71 | 62.10 | 55.47 | 46.32 | 35.10 | 31.65 | 46.11 | |||||||||||||
| 2005 | 35.16 | 37.18 | 39.94 | 41.10 | 50.48 | ----- | z | 65.84 | 63.29 | 52.83 | 45.68 | 38.57 | 33.74 | 45.80 | ||||||||||||
| 2006 | 31.65 | 32.39 | ----- | z | 42.53 | 52.29 | 60.30 | 68.71 | 58.94 | 55.03 | 43.90 | 38.20 | 28.45 | 46.58 | ||||||||||||
| 2007 | 26.42 | 35.61 | ----- | z | 45.17 | 49.81 | 56.87 | 64.45 | 64.45 | 53.80 | ----- | z | ----- | z | 30.29 | 47.43 | ||||||||||
| 2008 | 31.00 | 34.28 | 36.81 | 41.03 | 47.65 | 57.83 | 61.90 | 63.97 | 58.23 | ----- | z | ----- | z | ----- | z | 48.08 | ||||||||||
| 2009 | 31.87 | 34.18 | 37.23 | 41.47 | 54.52 | 55.30 | 65.26 | ----- | z | 59.10 | ----- | z | ----- | z | ----- | z | 47.36 | |||||||||
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | 30.13 | 31.39 | 39.06 | 43.20 | 46.06 | 54.60 | 61.87 | a | 63.45 | 59.13 | 48.58 | 32.83 | 27.48 | 44.82 | ||||||||||||
| 2012 | 33.55 | 33.48 | 38.16 | 43.90 | 54.42 | 57.67 | 63.48 | 69.13 | 62.13 | 49.48 | 38.90 | 34.29 | 48.22 | |||||||||||||
| 2013 | 27.97 | 31.04 | 43.14 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.05 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.82 | 33.05 | 36.73 | 41.56 | 47.90 | 54.26 | 60.83 | 60.23 | 54.20 | 44.48 | 34.52 | 29.26 | 43.90 | |||||||||||||
| S.D. | 3.82 | 3.55 | 3.13 | 2.39 | 3.00 | 3.01 | 3.61 | 3.32 | 3.68 | 3.23 | 3.92 | 3.41 | 2.02 | |||||||||||||
| SKEW | -0.40 | -0.26 | -0.41 | -0.20 | 0.04 | -0.64 | -0.75 | -0.21 | -0.65 | -0.51 | -0.86 | -0.64 | -0.56 | |||||||||||||
| MAX | 37.16 | 39.52 | 43.14 | 46.53 | 55.32 | 60.30 | 68.71 | 69.13 | 62.13 | 50.26 | 41.53 | 36.58 | 48.22 | |||||||||||||
| MIN | 16.94 | 25.04 | 26.55 | 36.30 | 38.55 | 45.07 | 50.00 | 53.32 | 42.87 | 33.74 | 23.43 | 18.26 | 38.57 | |||||||||||||
| NO YRS | 74 | 73 | 72 | 74 | 73 | 72 | 73 | 72 | 75 | 72 | 72 | 73 | 63 | |||||||||||||