| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 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 | 28.93 | 35.28 | f | 28.93 | ||
| 1930 | 17.32 | 37.11 | ----- | z | ----- | z | 39.58 | 44.10 | 46.16 | ----- | z | ----- | z | ----- | z | 34.43 | ----- | z | 36.45 | |||||||
| 1931 | ----- | z | 35.60 | c | 37.30 | h | 38.88 | d | 44.38 | b | 51.47 | 52.97 | a | 53.26 | ----- | z | ----- | z | ----- | z | ----- | z | 46.09 | |||
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.03 | ----- | z | ----- | z | ----- | z | 52.03 | ||
| 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 | ----- | 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 | 55.67 | v | 48.03 | 50.70 | 45.68 | 33.63 | 34.35 | 42.48 | ||||||
| 1941 | 32.52 | 33.11 | 38.27 | a | 38.33 | 44.42 | 45.27 | 49.23 | 50.61 | 47.13 | 40.89 | d | 37.80 | 36.29 | 41.16 | |||||||||||
| 1942 | 26.90 | 33.68 | 33.58 | 39.27 | 43.55 | 46.57 | 52.80 | k | ----- | z | 42.86 | p | 41.52 | 37.47 | 37.32 | 37.76 | ||||||||||
| 1943 | 25.53 | a | 31.29 | 33.87 | 41.57 | 40.33 | a | 44.33 | 46.97 | 49.77 | 43.70 | 42.67 | a | 33.13 | 28.00 | 38.43 | ||||||||||
| 1944 | 28.35 | 31.59 | 31.03 | 37.87 | 39.84 | 43.17 | 45.23 | 46.84 | 46.67 | 43.71 | 35.63 | 29.35 | 38.27 | |||||||||||||
| 1945 | 33.19 | 35.86 | 33.84 | 37.93 | a | 44.65 | 41.83 | a | 44.97 | 46.55 | 43.37 | 39.06 | 38.77 | 32.80 | a | 39.40 | ||||||||||
| 1946 | 33.03 | 35.85 | a | 34.43 | a | 36.47 | 41.90 | 46.20 | 46.00 | 45.03 | 42.60 | 38.03 | 32.43 | 34.39 | 38.86 | |||||||||||
| 1947 | 27.81 | 33.93 | 35.32 | 39.27 | 40.55 | 45.87 | 46.29 | 44.87 | 41.43 | 41.58 | 37.57 | 34.10 | 39.05 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.44 | d | 45.81 | 41.77 | 36.23 | 33.00 | 28.27 | a | 38.25 | |||||
| 1949 | 17.10 | 29.68 | 33.32 | 35.70 | 41.87 | 40.27 | 45.32 | 48.96 | c | 42.93 | b | 32.27 | a | 36.48 | a | 32.34 | b | 36.35 | ||||||||
| 1950 | 19.39 | 30.64 | 33.48 | 35.14 | a | 37.35 | 46.83 | 44.81 | 47.45 | 39.27 | 40.55 | 38.27 | 38.71 | 37.66 | ||||||||||||
| 1951 | 32.45 | 32.18 | 30.76 | b | 34.77 | 37.42 | 44.97 | 46.29 | 43.55 | 41.10 | 38.74 | 35.77 | 30.71 | 37.39 | ||||||||||||
| 1952 | 29.26 | 33.34 | 34.55 | 33.73 | 38.97 | 44.77 | 47.44 | o | 51.93 | b | 45.58 | k | 39.00 | a | 28.37 | 34.06 | 36.80 | |||||||||
| 1953 | 39.48 | 33.64 | 34.94 | 36.26 | c | 39.90 | 44.23 | 48.35 | 50.58 | 43.37 | 41.19 | 38.43 | 35.45 | 40.49 | ||||||||||||
| 1954 | 32.68 | 33.04 | 31.19 | 36.10 | a | 41.00 | ----- | z | ----- | z | 49.03 | 43.53 | 35.35 | 38.10 | 32.35 | 37.24 | ||||||||||
| 1955 | 32.26 | 32.64 | 32.10 | a | 34.77 | 37.72 | f | 48.15 | q | 48.81 | 44.90 | a | 43.07 | 41.68 | 32.37 | 33.03 | 37.56 | |||||||||
| 1956 | 34.03 | 28.66 | 34.52 | 38.03 | 43.94 | 45.53 | 49.55 | 50.44 | m | 44.70 | 39.84 | 29.77 | 32.48 | 38.28 | ||||||||||||
| 1957 | 20.39 | 29.96 | 35.37 | a | 37.60 | 43.48 | 47.88 | e | 47.57 | c | 47.35 | 47.72 | a | 43.07 | b | 31.50 | 37.19 | 39.09 | ||||||||
| 1958 | 36.19 | 41.67 | a | 34.45 | 39.90 | a | 45.94 | 53.53 | 53.45 | 50.71 | 45.86 | a | 40.26 | 38.69 | a | 37.04 | c | 43.14 | ||||||||
| 1959 | 33.70 | a | 34.21 | 34.62 | e | 38.00 | 41.97 | a | 49.73 | 49.90 | 46.46 | g | 47.97 | 43.07 | a | 33.90 | 30.65 | e | 39.79 | |||||||
| 1960 | 31.03 | 33.86 | a | 36.18 | c | 40.17 | 43.39 | 44.83 | 48.16 | 49.20 | a | 46.00 | b | 43.00 | 37.15 | c | 28.68 | c | 40.14 | |||||||
| 1961 | 33.65 | 39.27 | b | 38.19 | 38.48 | a | 44.23 | 47.43 | 51.13 | 52.58 | 43.80 | 39.90 | 31.57 | 33.90 | 41.18 | |||||||||||
| 1962 | 29.58 | 32.29 | 34.10 | 38.93 | 42.48 | 45.60 | 47.94 | 51.06 | 47.03 | 42.87 | 39.43 | 34.06 | 40.45 | |||||||||||||
| 1963 | 26.03 | 37.50 | 33.75 | c | 39.87 | 42.23 | 49.29 | b | 47.95 | i | 50.52 | 49.87 | 43.60 | a | 38.76 | a | 32.32 | 40.34 | ||||||||
| 1964 | 35.84 | 30.76 | 34.94 | 36.27 | 40.19 | 46.87 | 50.29 | 48.90 | 44.13 | 39.35 | 34.77 | 32.06 | 39.53 | |||||||||||||
| 1965 | 33.65 | 34.32 | 32.96 | c | 37.97 | 39.35 | 43.52 | a | 52.00 | b | 53.33 | a | 42.23 | 42.26 | 39.72 | a | 30.48 | 40.15 | ||||||||
| 1966 | 33.13 | 32.00 | 34.87 | 37.80 | 38.66 | b | 45.60 | 48.97 | 48.10 | 47.97 | 38.87 | 37.70 | 38.48 | 40.18 | ||||||||||||
| 1967 | 37.87 | 32.68 | 34.71 | 35.13 | 40.61 | 48.67 | 47.55 | 49.94 | 47.20 | 42.90 | 35.97 | 34.74 | 40.66 | |||||||||||||
| 1968 | 32.80 | a | 35.62 | 38.10 | 37.00 | c | 44.00 | 47.13 | 44.68 | 49.71 | 47.97 | 40.23 | 37.17 | 31.90 | 40.53 | |||||||||||
| 1969 | 26.52 | 32.46 | 32.65 | 39.43 | 43.94 | 53.83 | 49.55 | 46.97 | a | 48.63 | 40.48 | 37.17 | 35.35 | h | 41.06 | |||||||||||
| 1970 | 32.35 | 34.25 | 33.68 | 36.67 | 40.68 | 48.40 | 49.68 | 47.87 | 44.67 | 38.39 | 37.67 | 32.71 | 39.75 | |||||||||||||
| 1971 | 33.45 | 33.89 | 32.71 | c | 37.17 | 42.90 | a | 46.80 | 51.74 | 51.23 | 45.17 | 39.94 | 38.80 | 33.42 | 40.60 | |||||||||||
| 1972 | 31.68 | 34.66 | 39.35 | 37.03 | 44.94 | 48.87 | 52.30 | u | ----- | z | 44.89 | b | 38.19 | 36.60 | 29.63 | a | 38.58 | |||||||||
| 1973 | 30.68 | 34.32 | 36.77 | 37.27 | 43.71 | 49.03 | 51.19 | 46.97 | 48.37 | 42.58 | 37.90 | 37.86 | b | 41.39 | ||||||||||||
| 1974 | 29.68 | 35.50 | 36.93 | c | 41.47 | 43.19 | 48.87 | 50.74 | h | 51.97 | 47.27 | 37.00 | ----- | z | 36.03 | 40.79 | ||||||||||
| 1975 | ----- | z | ----- | z | 30.94 | 34.43 | 40.65 | e | ----- | z | 50.42 | 47.62 | e | 45.67 | 45.55 | 36.21 | a | 34.90 | a | 40.71 | ||||||
| 1976 | 34.73 | a | 33.65 | l | 33.71 | 38.70 | c | 42.87 | 45.80 | ----- | z | ----- | z | 49.40 | 40.00 | 36.45 | a | 32.55 | 39.36 | |||||||
| 1977 | 26.23 | 34.04 | 35.19 | 38.97 | 43.26 | 48.77 | 48.84 | 54.71 | 48.90 | 41.84 | 37.37 | 37.87 | 41.33 | |||||||||||||
| 1978 | 36.55 | 39.11 | 39.13 | a | 41.13 | 43.68 | 51.47 | 52.74 | 52.55 | i | 51.00 | 41.00 | 31.30 | 30.38 | b | 41.59 | ||||||||||
| 1979 | 25.72 | b | 33.72 | j | 37.03 | a | 40.33 | 42.77 | 45.70 | 50.48 | 50.13 | 48.70 | 44.71 | 33.27 | 37.61 | 41.50 | ||||||||||
| 1980 | 25.26 | 33.41 | 36.68 | 40.13 | 43.87 | 48.27 | 50.87 | a | 47.68 | 45.87 | 38.26 | 39.13 | 36.16 | 40.47 | ||||||||||||
| 1981 | 31.83 | a | 33.82 | 36.81 | 40.23 | 44.55 | 48.33 | 50.13 | 51.52 | 46.70 | 39.00 | 36.97 | 35.68 | 41.30 | ||||||||||||
| 1982 | 31.42 | 33.93 | 34.35 | 35.20 | 41.68 | 49.57 | 50.29 | 51.06 | 47.70 | 39.84 | 33.37 | 32.97 | 40.11 | |||||||||||||
| 1983 | 36.29 | 39.18 | 40.74 | 36.90 | 44.90 | 48.63 | 51.90 | 51.45 | 43.37 | 37.61 | 41.40 | 29.58 | 41.83 | |||||||||||||
| 1984 | 32.81 | 34.66 | 40.00 | 39.03 | 42.68 | 46.57 | 47.87 | 47.29 | 45.50 | 41.03 | 36.97 | 30.42 | 40.40 | |||||||||||||
| 1985 | 24.32 | 29.64 | 32.84 | 39.30 | 42.19 | 45.43 | 50.45 | 47.13 | 43.50 | 38.48 | 28.80 | 23.06 | 37.10 | |||||||||||||
| 1986 | 32.81 | 34.82 | 38.45 | 36.40 | 42.61 | 49.90 | 49.03 | 50.32 | 45.63 | 40.03 | 37.17 | 30.06 | 40.60 | |||||||||||||
| 1987 | 30.23 | 34.46 | 37.52 | 38.43 | 45.10 | 45.83 | 50.94 | 47.45 | 44.67 | 35.68 | 37.50 | 30.55 | 39.86 | |||||||||||||
| 1988 | 30.48 | 31.93 | 34.35 | 40.13 | 43.45 | 46.57 | 48.68 | 47.10 | 43.83 | 44.19 | 38.97 | 31.81 | 40.12 | |||||||||||||
| 1989 | 34.19 | 24.75 | 35.87 | 38.90 | 43.87 | 48.93 | 50.10 | 50.68 | 43.00 | 40.16 | 37.87 | 32.35 | 40.06 | |||||||||||||
| 1990 | 34.39 | 31.14 | 35.45 | 40.77 | 43.65 | 50.13 | 51.94 | 53.23 | 49.27 | 37.77 | 37.50 | 25.87 | 40.92 | |||||||||||||
| 1991 | 28.68 | 36.71 | 33.81 | 38.63 | 43.23 | 46.43 | 50.42 | 51.84 | 45.13 | 37.19 | 39.37 | 35.55 | 40.58 | |||||||||||||
| 1992 | 34.48 | 37.07 | 36.97 | 42.80 | 43.68 | 48.97 | 53.23 | 49.65 | 44.23 | 42.00 | 36.27 | 31.65 | 41.75 | |||||||||||||
| 1993 | 27.61 | 27.71 | 36.81 | 41.93 | 47.42 | 49.30 | 51.32 | 51.26 | 43.60 | 40.45 | 28.00 | 30.94 | 39.70 | |||||||||||||
| 1994 | 34.90 | 31.18 | 36.35 | 40.67 | 45.32 | 46.93 | 50.52 | 51.03 | 47.83 | 36.58 | 33.60 | 34.39 | 40.78 | |||||||||||||
| 1995 | 34.61 | 34.25 | 34.97 | 38.07 | 44.77 | 49.00 | 53.58 | 48.26 | 51.03 | 41.55 | 41.20 | 34.23 | 42.13 | |||||||||||||
| 1996 | 35.42 | 30.17 | 35.71 | 41.37 | 43.65 | 46.47 | 52.03 | 48.94 | 44.23 | 40.10 | 36.93 | 33.87 | 40.74 | |||||||||||||
| 1997 | 33.29 | 31.54 | 36.87 | 38.50 | 45.35 | 47.73 | 50.19 | 53.00 | 48.43 | 41.65 | 38.87 | 31.87 | 41.44 | |||||||||||||
| 1998 | 36.71 | 37.43 | 36.84 | 38.50 | 46.94 | 49.70 | 55.55 | 50.19 | 45.73 | 40.06 | 41.60 | 32.48 | 42.64 | |||||||||||||
| 1999 | 34.84 | 36.68 | 35.10 | 35.43 | 40.97 | 49.23 | 49.74 | 53.16 | 41.53 | 38.29 | 40.67 | 34.90 | 40.88 | |||||||||||||
| 2000 | 31.45 | 34.17 | 33.61 | 39.80 | 45.58 | 47.83 | 50.16 | 48.45 | 47.33 | 40.16 | 30.40 | 32.03 | 40.08 | |||||||||||||
| 2001 | 31.71 | 29.21 | 35.55 | 37.97 | 42.26 | 47.87 | 51.68 | 53.00 | 46.13 | 38.97 | b | 39.63 | 32.16 | 40.51 | ||||||||||||
| 2002 | 34.71 | 30.61 | 33.03 | 39.47 | 42.10 | 49.30 | 51.52 | 49.42 | 44.60 | 36.55 | 35.13 | 35.35 | 40.15 | |||||||||||||
| 2003 | 36.74 | 32.46 | 39.97 | 40.80 | 44.45 | 49.53 | 51.00 | 50.03 | 48.13 | 46.45 | 33.23 | 34.55 | 42.28 | |||||||||||||
| 2004 | 31.58 | 34.66 | 37.77 | 39.73 | 46.74 | 50.63 | 54.61 | 55.61 | 48.47 | 44.35 | 36.30 | 35.42 | 42.99 | |||||||||||||
| 2005 | 33.16 | 29.00 | 36.32 | 41.87 | 48.55 | 49.13 | 53.06 | 50.87 | 42.80 | 46.52 | 34.27 | 32.42 | 41.50 | |||||||||||||
| 2006 | 39.32 | 29.89 | 36.71 | 40.60 | ----- | z | 51.27 | 52.06 | 48.81 | 45.97 | 37.94 | 38.53 | 30.71 | 41.07 | ||||||||||||
| 2007 | 26.84 | 35.39 | 37.52 | 38.43 | 41.55 | 48.13 | 53.97 | 51.32 | 45.73 | 40.87 | 33.83 | 33.90 | 40.62 | |||||||||||||
| 2008 | 30.03 | 33.41 | 33.13 | 36.07 | 46.03 | 46.10 | 49.84 | 53.45 | 46.27 | 40.29 | 39.50 | 30.29 | 40.37 | |||||||||||||
| 2009 | 29.71 | 28.68 | 34.06 | 37.03 | 42.58 | 50.37 | 54.23 | 52.68 | 47.83 | 40.39 | 36.97 | 26.26 | 40.07 | |||||||||||||
| 2010 | 39.68 | 36.43 | 36.65 | 39.27 | 42.90 | 47.10 | 50.39 | 50.84 | 50.77 | 41.35 | 36.43 | 35.58 | 42.28 | |||||||||||||
| 2011 | 33.13 | 30.96 | 37.61 | 36.07 | 41.77 | 47.90 | a | 49.65 | 51.35 | 48.73 | 43.58 | 34.27 | 29.16 | 40.35 | ||||||||||||
| 2012 | 31.48 | 33.31 | 34.32 | 39.47 | 41.42 | 47.47 | 51.94 | 50.77 | 43.83 | 41.39 | 39.70 | 35.61 | 40.89 | |||||||||||||
| 2013 | 29.65 | 33.93 | 36.92 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.50 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 31.34 | 33.39 | 35.35 | 38.36 | 42.88 | 47.54 | 49.92 | 49.78 | 45.91 | 40.49 | 36.08 | 32.92 | 40.37 | |||||||||||||
| S.D. | 4.68 | 2.96 | 2.22 | 2.03 | 2.24 | 2.47 | 2.60 | 2.51 | 2.71 | 2.68 | 3.21 | 3.07 | 1.36 | |||||||||||||
| SKEW | -1.00 | 0.01 | 0.18 | -0.15 | -0.17 | -0.15 | -0.30 | -0.16 | 0.07 | -0.10 | -0.71 | -0.49 | -0.64 | |||||||||||||
| MAX | 39.68 | 41.67 | 40.74 | 42.80 | 48.55 | 53.83 | 55.55 | 55.61 | 52.03 | 46.52 | 41.60 | 38.71 | 43.14 | |||||||||||||
| MIN | 17.10 | 24.75 | 30.76 | 33.73 | 37.35 | 40.27 | 44.44 | 43.55 | 39.27 | 32.27 | 28.00 | 23.06 | 36.35 | |||||||||||||
| NO YRS | 72 | 71 | 72 | 72 | 71 | 70 | 67 | 68 | 72 | 73 | 74 | 72 | 56 | |||||||||||||