| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.55 | k | 59.50 | 51.85 | 41.52 | 37.15 | 47.50 | |||||
| 1938 | ----- | z | ----- | z | ----- | z | ----- | z | 52.13 | ----- | z | 75.00 | 73.03 | b | ----- | z | ----- | z | ----- | z | 33.97 | 58.53 | ||||
| 1939 | 34.53 | 28.07 | 39.40 | 48.67 | 55.50 | a | 57.05 | a | 68.08 | 66.52 | 58.47 | 47.89 | 39.18 | 37.60 | 48.41 | |||||||||||
| 1940 | 32.84 | 37.02 | c | 42.85 | 47.38 | 56.55 | 63.67 | 67.82 | a | 66.06 | 62.24 | g | 50.42 | 33.32 | 34.98 | 48.45 | ||||||||||
| 1941 | 34.27 | 37.80 | 42.60 | e | 47.29 | a | 54.27 | a | 58.95 | 68.60 | a | 65.98 | 53.26 | a | 46.63 | a | 40.72 | 35.32 | 48.81 | |||||||
| 1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.22 | g | 49.63 | a | 36.05 | 31.10 | a | 38.93 | ||
| 1943 | 23.95 | 33.05 | 37.82 | ----- | z | ----- | z | 55.45 | k | 64.52 | a | 61.34 | 58.53 | 47.44 | 37.43 | a | ----- | z | 45.51 | |||||||
| 1944 | 22.54 | q | 30.64 | 34.96 | d | 47.52 | 54.66 | 58.63 | 65.86 | b | 63.55 | a | 59.88 | b | 50.53 | b | 34.24 | a | 30.12 | r | 50.05 | |||||
| 1945 | 32.27 | a | 36.37 | a | 37.88 | a | 44.00 | 53.57 | a | 57.03 | 66.53 | 64.02 | 54.77 | 42.26 | 35.40 | 28.45 | 46.05 | |||||||||
| 1946 | 29.45 | 29.39 | 40.98 | 47.92 | 51.94 | 56.62 | 64.11 | 63.95 | 53.33 | 42.50 | 35.08 | 34.97 | 45.85 | |||||||||||||
| 1947 | 23.56 | 35.43 | 42.45 | 49.47 | a | 58.63 | 56.47 | 66.84 | ----- | z | 60.78 | 49.85 | 36.77 | 33.78 | v | 48.02 | ||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.48 | 63.37 | 57.10 | 47.55 | 35.57 | 18.40 | f | 53.41 | ||||||
| 1949 | 7.85 | 29.98 | 41.10 | 49.50 | 56.94 | 59.55 | 66.20 | a | 67.11 | 60.34 | a | 43.55 | 43.90 | 31.55 | 46.46 | |||||||||||
| 1950 | ----- | z | ----- | z | ----- | z | 44.75 | n | 50.31 | 58.67 | 65.64 | b | 65.15 | 57.08 | 51.37 | 40.73 | 38.94 | 53.48 | ||||||||
| 1951 | 28.72 | a | 34.89 | 35.39 | 46.52 | c | 54.40 | a | 57.43 | 66.52 | 63.18 | a | 58.83 | 46.81 | 36.88 | 28.44 | 46.50 | |||||||||
| 1952 | 26.18 | 30.47 | 35.70 | a | 48.98 | 54.37 | 58.80 | 65.19 | 64.61 | 60.20 | 51.84 | 32.03 | 31.11 | 46.62 | ||||||||||||
| 1953 | 38.63 | 33.30 | 38.94 | 44.63 | 49.66 | 56.08 | 64.84 | 64.87 | a | 59.48 | 49.69 | 42.47 | 33.85 | 48.04 | ||||||||||||
| 1954 | 34.20 | a | 39.91 | 37.24 | 45.75 | 54.30 | a | 56.67 | a | 66.43 | c | 62.24 | n | 57.18 | 46.82 | 42.07 | 30.27 | 46.44 | ||||||||
| 1955 | 27.53 | a | 27.68 | 31.32 | 41.38 | 50.24 | 61.12 | 65.00 | 64.37 | 56.80 | 49.57 | b | 31.60 | 31.48 | 44.84 | |||||||||||
| 1956 | 30.23 | 26.28 | 37.00 | 47.45 | 55.84 | 58.00 | 67.85 | 64.40 | 58.52 | 46.65 | 35.40 | 32.18 | 46.65 | |||||||||||||
| 1957 | 18.31 | 32.19 | a | 41.08 | 48.22 | 55.87 | 61.86 | a | 66.56 | 63.39 | 60.70 | 47.95 | 35.45 | 36.50 | 47.34 | |||||||||||
| 1958 | 34.53 | 40.59 | a | 38.44 | 45.42 | 59.32 | 64.13 | 69.95 | 68.87 | 58.25 | 50.52 | 38.88 | 38.10 | 50.58 | ||||||||||||
| 1959 | 33.74 | 35.64 | 40.81 | 50.08 | 49.26 | 61.07 | 68.68 | 61.79 | 54.87 | 48.10 | 36.73 | 31.34 | 47.68 | |||||||||||||
| 1960 | 23.69 | 31.57 | 40.44 | 47.92 | 49.47 | 60.15 | 70.08 | 62.24 | 58.68 | 49.15 | 37.35 | 31.71 | 46.87 | |||||||||||||
| 1961 | 33.48 | 39.43 | 40.56 | 45.63 | 52.79 | 64.20 | 69.08 | 72.19 | 53.37 | 47.44 | 35.08 | 30.82 | 48.67 | |||||||||||||
| 1962 | 25.61 | 32.52 | 37.44 | 49.42 | 49.35 | 59.32 | 63.94 | 63.23 | c | 58.27 | 48.02 | 40.78 | 34.89 | 46.90 | ||||||||||||
| 1963 | 23.92 | 42.39 | 40.02 | 43.63 | 54.81 | ----- | z | 64.58 | 66.02 | 63.13 | 51.40 | 41.17 | 31.39 | 47.50 | ||||||||||||
| 1964 | 29.89 | 29.91 | 36.55 | 43.68 | 51.97 | 58.78 | 67.40 | 62.42 | 54.78 | 49.27 | 38.40 | 30.60 | 46.14 | |||||||||||||
| 1965 | 31.13 | 36.75 | 36.92 | 48.03 | 51.60 | 59.92 | 66.45 | 65.50 | 52.25 | 52.11 | ----- | z | 33.97 | 48.60 | ||||||||||||
| 1966 | 31.25 | m | 31.07 | 39.15 | d | 43.16 | e | 52.27 | e | 56.02 | b | 65.08 | f | 65.15 | d | 62.85 | d | 47.96 | f | 40.38 | f | 35.46 | d | 48.14 | ||
| 1967 | 44.15 | 38.16 | c | 39.43 | d | 42.42 | j | 51.94 | g | 62.44 | l | 69.88 | j | 70.87 | a | 64.68 | 49.70 | a | 39.04 | c | 28.19 | d | 46.78 | |||
| 1968 | 31.34 | f | 38.70 | d | 43.46 | c | 43.17 | d | 51.88 | k | 63.19 | n | 69.31 | g | 62.21 | l | 58.47 | m | 47.13 | l | ----- | z | ----- | z | 41.78 | |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.08 | 44.19 | 38.60 | 33.77 | 44.16 | |||||
| 1970 | 32.66 | 38.23 | 38.39 | 41.57 | 53.11 | 63.20 | 67.68 | 66.29 | 52.40 | 45.45 | 39.27 | 29.89 | 47.34 | |||||||||||||
| 1971 | 33.63 | 36.11 | 36.58 | 46.12 | 54.69 | 57.63 | 66.19 | 70.06 | 52.82 | 44.77 | 38.18 | 29.37 | 47.18 | |||||||||||||
| 1972 | 28.37 | 35.31 | 43.19 | 43.05 | 55.44 | 61.48 | 66.02 | 67.85 | 54.85 | 48.16 | 39.38 | 25.23 | 47.36 | |||||||||||||
| 1973 | 28.27 | 37.00 | 41.21 | 44.90 | 55.73 | 61.07 | 67.65 | 66.08 | 58.83 | 47.55 | 36.65 | 36.18 | 48.43 | |||||||||||||
| 1974 | 25.05 | 37.29 | 40.37 | 46.38 | 50.45 | 64.72 | 66.60 | 66.06 | 59.43 | 47.90 | 40.88 | 36.06 | w | 49.56 | ||||||||||||
| 1975 | 30.92 | m | 30.82 | k | 38.00 | 41.42 | 51.92 | 59.28 | 70.66 | 63.44 | 59.00 | 49.63 | 36.67 | 34.65 | 50.47 | |||||||||||
| 1976 | 30.56 | 32.84 | 36.47 | 45.07 | 54.05 | 57.60 | 67.48 | 63.61 | 60.83 | 48.19 | 40.93 | 31.60 | 47.44 | |||||||||||||
| 1977 | 24.63 | 37.20 | 38.03 | 49.45 | 50.81 | 64.95 | 66.47 | 68.61 | 57.03 | 49.37 | 37.22 | 35.84 | 48.30 | |||||||||||||
| 1978 | 35.18 | 38.55 | 45.32 | 46.82 | 51.35 | 61.12 | 68.03 | 66.87 | 57.53 | 49.02 | 33.38 | 24.52 | 48.14 | |||||||||||||
| 1979 | 17.29 | 33.61 | 41.15 | 46.90 | 55.44 | 61.73 | 68.13 | 67.23 | 61.90 | 51.32 | 33.60 | 36.92 | 47.93 | |||||||||||||
| 1980 | 28.90 | 38.76 | 39.31 | 49.37 | 54.87 | 58.72 | 66.85 | 62.58 | 60.60 | 48.32 | 39.52 | 35.52 | 48.61 | |||||||||||||
| 1981 | 35.21 | 35.66 | 42.63 | 48.08 | 54.00 | 59.95 | 65.05 | 68.95 | 57.96 | d | 46.82 | 41.53 | 34.37 | 49.19 | ||||||||||||
| 1982 | 28.82 | 30.68 | 39.63 | 43.50 | 52.68 | 64.37 | 66.06 | 67.13 | 57.38 | 48.42 | 35.17 | 32.13 | 47.16 | |||||||||||||
| 1983 | 35.82 | 39.45 | 44.03 | 45.38 | 55.48 | 60.03 | 65.44 | 70.10 | a | 55.40 | 49.50 | 40.83 | 23.65 | 48.76 | ||||||||||||
| 1984 | 27.81 | 32.10 | 41.69 | 44.75 | 51.48 | 58.38 | 66.08 | 67.45 | 56.65 | 44.44 | 38.77 | 24.63 | 46.19 | |||||||||||||
| 1985 | 20.89 | 26.16 | 36.68 | a | 49.05 | 55.32 | 61.48 | 69.97 | 63.77 | 52.27 | 46.48 | 26.43 | 20.16 | 44.06 | ||||||||||||
| 1986 | 33.68 | 38.00 | 45.97 | 46.43 | 54.95 | 64.77 | 63.26 | 69.37 | 54.00 | 48.74 | 37.95 | 31.79 | 49.08 | |||||||||||||
| 1987 | 27.27 | 36.50 | 42.55 | 53.12 | 57.21 | 63.02 | 65.94 | 63.82 | 60.95 | 48.32 | 39.67 | 31.20 | a | 49.13 | ||||||||||||
| 1988 | 28.40 | 35.47 | 40.95 | 49.97 | 54.63 | 61.23 | 66.31 | 65.55 | 59.02 | 55.42 | 39.12 | 28.94 | 48.75 | |||||||||||||
| 1989 | 28.29 | 22.18 | 39.85 | 50.52 | 53.68 | 62.62 | 67.35 | 63.97 | 57.87 | 46.08 | 39.92 | 32.66 | 47.08 | |||||||||||||
| 1990 | 33.55 | 32.45 | 41.52 | 50.07 | 51.31 | 59.58 | 67.56 | 65.68 | 61.73 | 45.26 | 39.73 | 21.71 | 47.51 | |||||||||||||
| 1991 | 25.71 | 38.93 | 38.32 | 44.28 | 49.52 | 56.07 | ----- | z | 67.10 | 58.68 | 46.81 | 36.67 | 33.45 | 45.05 | ||||||||||||
| 1992 | 33.44 | 40.66 | 44.65 | 48.95 | 56.50 | 62.98 | 64.35 | 65.40 | 55.87 | 49.40 | 35.22 | 26.02 | 48.62 | |||||||||||||
| 1993 | 22.90 | 24.84 | 38.35 | 44.68 | 57.74 | 58.07 | 58.98 | 61.85 | 56.25 | 48.53 | 30.57 | 33.40 | 44.68 | |||||||||||||
| 1994 | 36.16 | 31.27 | 41.69 | 48.65 | 56.03 | 58.52 | 67.29 | 66.39 | 59.92 | 45.82 | 31.43 | 29.87 | 47.75 | |||||||||||||
| 1995 | 31.95 | 38.07 | 40.27 | 44.72 | 52.50 | 58.45 | 65.37 | 61.55 | 60.17 | 44.47 | 41.83 | 33.29 | 47.72 | |||||||||||||
| 1996 | 32.74 | 31.22 | 41.47 | 46.95 | 50.47 | 59.55 | 67.08 | 64.32 | 54.37 | 47.10 | 38.80 | 32.69 | 47.23 | |||||||||||||
| 1997 | 30.50 | 34.75 | 41.66 | 44.43 | 56.24 | 59.47 | 63.53 | 67.39 | 60.53 | 47.23 | 41.18 | 31.02 | 48.16 | |||||||||||||
| 1998 | 34.29 | 38.11 | 40.60 | 46.32 | 53.60 | 58.73 | 69.37 | 67.37 | 63.47 | 46.65 | 40.35 | 29.40 | 49.02 | |||||||||||||
| 1999 | 35.50 | 34.89 | 40.15 | 43.25 | 50.98 | 58.73 | b | 64.16 | 68.85 | 56.72 | 48.47 | 43.60 | 31.68 | 48.08 | ||||||||||||
| 2000 | 32.31 | 38.60 | 41.04 | e | 50.60 | 54.56 | 59.94 | d | 66.19 | 65.31 | 57.97 | 47.40 | e | 32.05 | 30.60 | 48.05 | ||||||||||
| 2001 | 28.24 | 31.84 | 41.82 | 44.90 | 55.77 | 59.43 | 66.55 | a | 68.45 | 61.62 | a | ----- | z | ----- | z | ----- | z | 50.96 | ||||||||
| 2002 | ----- | z | ----- | z | 37.56 | 45.48 | 51.77 | 61.95 | 69.61 | 62.18 | 57.32 | 42.95 | 37.97 | 33.71 | 50.05 | |||||||||||
| 2003 | 37.13 | 34.07 | 42.50 | 45.12 | 67.00 | z | 62.03 | 70.65 | 68.45 | 60.50 | 52.05 | 33.70 | 34.26 | 49.13 | ||||||||||||
| 2004 | 28.48 | 32.76 | 43.42 | 47.98 | 53.03 | 60.72 | 68.40 | 67.35 | 56.45 | 48.44 | 38.37 | 33.90 | 48.28 | |||||||||||||
| 2005 | 31.74 | 34.50 | 42.02 | 45.97 | 54.94 | 57.50 | 67.06 | 66.39 | 55.07 | 48.44 | 36.30 | 24.92 | 47.07 | |||||||||||||
| 2006 | 36.00 | 33.48 | 38.60 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.03 | ||||
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2009 | 28.46 | g | 32.00 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.90 | 34.37 | 39.96 | 46.54 | 53.64 | 59.99 | 66.75 | 65.81 | 57.99 | 48.06 | 37.57 | 31.73 | 47.55 | |||||||||||||
| S.D. | 5.80 | 4.23 | 2.72 | 2.56 | 2.45 | 2.44 | 2.31 | 2.63 | 2.93 | 2.49 | 3.43 | 3.98 | 1.27 | |||||||||||||
| SKEW | -0.97 | -0.58 | -0.35 | 0.04 | -0.01 | 0.36 | 0.19 | 0.47 | -0.13 | -0.03 | -0.66 | -0.79 | -0.60 | |||||||||||||
| MAX | 44.15 | 42.39 | 45.97 | 53.12 | 59.32 | 64.95 | 75.00 | 73.03 | 64.68 | 55.42 | 43.90 | 38.94 | 50.58 | |||||||||||||
| MIN | 7.85 | 22.18 | 31.32 | 41.38 | 49.26 | 56.02 | 58.98 | 61.34 | 52.25 | 42.26 | 26.43 | 20.16 | 44.06 | |||||||||||||
| NO YRS | 59 | 62 | 64 | 61 | 61 | 60 | 62 | 63 | 65 | 65 | 64 | 62 | 47 | |||||||||||||