| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1936 | ----- | z | ----- | z | ----- | z | ----- | z | 59.71 | 63.75 | 72.63 | 71.95 | 61.42 | 54.37 | 37.68 | 31.73 | 56.65 | |||||||||
| 1937 | 12.24 | 27.32 | 40.79 | 44.90 | 57.94 | 61.68 | 74.18 | 69.21 | 64.47 | 53.60 | 40.85 | 35.53 | 48.56 | |||||||||||||
| 1938 | 30.65 | 36.23 | 38.97 | 48.68 | 54.90 | 65.88 | 72.27 | 68.03 | 66.73 | 51.44 | 32.28 | c | 31.45 | 49.79 | ||||||||||||
| 1939 | 30.45 | 27.11 | 39.10 | a | 51.08 | 60.26 | d | 58.78 | 72.71 | 73.34 | 63.13 | 49.15 | 41.45 | 35.63 | 50.18 | |||||||||||
| 1940 | 30.24 | 37.33 | z | 43.36 | x | 47.78 | 60.27 | 66.65 | 70.53 | 72.32 | 61.00 | 52.13 | 30.48 | 32.69 | 52.41 | |||||||||||
| 1941 | 30.98 | ----- | z | 42.39 | 49.12 | 55.52 | ----- | z | 70.50 | t | 61.39 | q | 55.27 | 47.24 | 38.42 | 30.05 | a | 43.62 | ||||||||
| 1942 | 20.60 | 29.13 | a | 36.84 | 49.46 | b | 51.26 | 58.14 | b | 70.87 | p | 69.02 | 59.32 | 49.29 | 35.90 | 29.27 | 44.38 | |||||||||
| 1943 | 23.19 | 29.64 | 34.23 | 51.36 | b | ----- | z | 57.73 | 68.92 | a | 66.06 | 62.43 | 49.58 | a | 37.77 | 29.08 | 46.36 | |||||||||
| 1944 | 21.98 | 32.12 | 36.60 | 47.78 | 56.13 | 59.33 | 68.50 | 66.10 | 60.05 | 52.68 | 34.90 | 27.71 | 46.99 | |||||||||||||
| 1945 | 27.15 | 35.38 | t | 39.47 | 46.97 | a | 55.22 | a | 58.73 | 68.79 | 68.11 | 56.75 | 49.50 | a | 35.80 | 27.65 | a | 48.56 | ||||||||
| 1946 | 21.39 | 24.91 | 37.73 | 48.82 | 55.60 | ----- | z | 68.11 | 67.27 | a | 55.70 | 41.82 | 36.88 | 33.05 | 44.66 | |||||||||||
| 1947 | 19.53 | 32.93 | 42.13 | 46.90 | 58.05 | 57.55 | 67.16 | 64.05 | 58.20 | ----- | z | 32.73 | 28.40 | 46.15 | ||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.53 | 63.19 | 56.53 | a | 48.29 | 36.15 | q | 7.03 | o | 58.14 | ||||
| 1949 | 0.54 | f | 25.93 | 37.98 | b | 49.42 | 57.75 | c | 60.87 | 66.81 | 67.27 | a | 60.71 | b | 42.45 | 40.95 | a | 25.89 | 48.73 | |||||||
| 1950 | 17.92 | 27.27 | 34.85 | 45.17 | 50.41 | d | 59.42 | 66.28 | a | 66.53 | 57.27 | 51.15 | d | 37.79 | k | 34.35 | 46.42 | |||||||||
| 1951 | 21.60 | e | 27.41 | e | 32.85 | 46.95 | 54.21 | 57.62 | 68.16 | 65.18 | 58.42 | 45.45 | a | 34.83 | f | 23.13 | a | 45.54 | ||||||||
| 1952 | 21.78 | a | 20.11 | a | 30.63 | 47.55 | 53.89 | i | 57.67 | i | 66.18 | 65.66 | b | 60.18 | 53.24 | n | 33.30 | j | 26.65 | e | 42.34 | |||||
| 1953 | 35.87 | h | 31.54 | 38.90 | f | 44.55 | 48.76 | 56.07 | 67.82 | 66.42 | 61.33 | a | 50.06 | 39.43 | c | 26.18 | 49.21 | |||||||||
| 1954 | 30.57 | a | 36.35 | d | 37.77 | a | 46.47 | 55.40 | e | 60.82 | m | 68.55 | 62.66 | 57.21 | a | 46.16 | b | 39.85 | 21.40 | 45.67 | ||||||
| 1955 | 18.92 | f | 17.27 | b | 35.25 | u | 41.48 | 51.94 | d | 61.68 | 66.82 | a | 66.95 | a | 57.75 | b | 48.06 | 30.79 | a | 25.37 | a | 46.81 | ||||
| 1956 | 25.53 | 22.24 | 35.87 | a | 47.33 | 54.88 | b | 59.28 | e | 69.35 | 65.23 | 58.77 | 45.02 | a | 32.90 | a | 26.44 | 45.24 | ||||||||
| 1957 | 13.61 | 28.70 | 39.50 | a | 47.78 | a | 56.18 | 60.97 | 66.87 | 64.58 | a | 60.60 | a | 47.00 | 33.61 | b | 29.85 | 45.77 | ||||||||
| 1958 | 24.92 | 35.04 | 38.03 | 45.25 | 60.02 | 62.92 | 68.98 | 69.55 | 56.45 | 49.77 | 36.37 | 33.35 | 48.39 | |||||||||||||
| 1959 | 30.94 | 34.09 | 38.47 | 47.62 | 50.18 | 62.73 | 67.92 | 63.90 | 55.55 | a | 46.84 | 32.88 | 25.45 | 46.38 | ||||||||||||
| 1960 | 19.05 | b | 26.57 | b | 34.87 | d | 46.22 | 49.64 | b | 61.02 | 72.62 | j | 62.24 | 60.34 | a | 46.79 | 36.20 | 26.92 | 42.71 | |||||||
| 1961 | 24.82 | 35.32 | 39.92 | 45.37 | 53.85 | 66.18 | 69.66 | 71.39 | 53.60 | 45.53 | 32.97 | 24.44 | 46.92 | |||||||||||||
| 1962 | 15.39 | 26.66 | 35.48 | 49.52 | 51.66 | 60.17 | 65.31 | 64.31 | 58.97 | 47.34 | 37.52 | 32.53 | 45.40 | |||||||||||||
| 1963 | 21.85 | 38.95 | 39.95 | 43.47 | 55.58 | 59.58 | 64.73 | 66.84 | 63.47 | 51.61 | 37.05 | 25.00 | 47.34 | |||||||||||||
| 1964 | 21.66 | 19.26 | 31.58 | 44.22 | 52.63 | 59.75 | 67.77 | 63.95 | 55.43 | 49.32 | 34.83 | 27.66 | 44.01 | |||||||||||||
| 1965 | 28.66 | 29.00 | 36.15 | 48.53 | 52.15 | 60.82 | 67.73 | 65.00 | 53.77 | 50.89 | 38.97 | 28.45 | 46.67 | |||||||||||||
| 1966 | 30.89 | 28.46 | 40.00 | 47.45 | 57.31 | 59.58 | 67.73 | 66.94 | 62.80 | 46.08 | 38.55 | 28.61 | 47.87 | |||||||||||||
| 1967 | 29.84 | 32.18 | 38.60 | 42.25 | 53.26 | 60.95 | 70.16 | 70.55 | 63.55 | 47.10 | 37.23 | 23.13 | 47.40 | |||||||||||||
| 1968 | 22.02 | 34.02 | 42.74 | 43.22 | 52.55 | 61.03 | 69.44 | 63.18 | 57.23 | 45.65 | 36.23 | 27.27 | 46.21 | |||||||||||||
| 1969 | 24.15 | 28.00 | 34.65 | 48.17 | 57.24 | 62.13 | 66.60 | 66.81 | 59.65 | 43.61 | 36.90 | 32.10 | 46.67 | |||||||||||||
| 1970 | 29.84 | 33.84 | 38.71 | 41.25 | 52.82 | 64.03 | 68.87 | 68.16 | 53.33 | 43.81 | 37.45 | 25.02 | 46.43 | |||||||||||||
| 1971 | 26.56 | 30.82 | 34.42 | 45.87 | 55.85 | 59.10 | 68.61 | 71.66 | 53.42 | 44.63 | 33.30 | 23.48 | 45.64 | |||||||||||||
| 1972 | 22.21 | 28.53 | 40.98 | 43.28 | 55.79 | 61.78 | 66.69 | 69.23 | 54.48 | 48.29 | 37.73 | 20.31 | 45.78 | |||||||||||||
| 1973 | 21.16 | 31.54 | 39.35 | 45.52 | 56.08 | 61.42 | 68.92 | 66.52 | 58.40 | 46.71 | 35.15 | 28.81 | 46.63 | |||||||||||||
| 1974 | 19.73 | 33.61 | 39.71 | 46.15 | 51.63 | 65.68 | 67.27 | 65.95 | 59.83 | 47.76 | 37.73 | 26.60 | 46.80 | |||||||||||||
| 1975 | 22.21 | 27.45 | 34.05 | 41.70 | 52.11 | 59.18 | 72.03 | 64.03 | 59.82 | 48.27 | 33.05 | 25.61 | 44.96 | |||||||||||||
| 1976 | 23.82 | 25.90 | 31.26 | 45.82 | 55.55 | 58.10 | 68.94 | 63.21 | 60.62 | 47.52 | 38.65 | 27.34 | 45.56 | |||||||||||||
| 1977 | 18.89 | 32.52 | 37.19 | 49.62 | 51.18 | 66.25 | 67.11 | 68.23 | 57.50 | 47.94 | 35.52 | 32.98 | 47.08 | |||||||||||||
| 1978 | 31.03 | 35.68 | 44.82 | 46.03 | 51.16 | 60.52 | 67.11 | 64.03 | 56.50 | 48.05 | 32.20 | 15.63 | 46.06 | |||||||||||||
| 1979 | 9.11 | 29.55 | 38.61 | 46.20 | 54.63 | 61.23 | 68.87 | 67.74 | 61.50 | 50.97 | 32.98 | 30.42 | 45.99 | |||||||||||||
| 1980 | 26.98 | 35.53 | 39.26 | 49.10 | 55.74 | 58.33 | 67.71 | 62.74 | 59.23 | 47.87 | 36.05 | 30.63 | 47.43 | |||||||||||||
| 1981 | 32.42 | 34.39 | 41.58 | 47.87 | 53.47 | 58.88 | 65.58 | 69.61 | 59.13 | 45.63 | 39.80 | 31.03 | 48.28 | |||||||||||||
| 1982 | 21.55 | 22.66 | 37.53 | 43.42 | 51.68 | 62.48 | 66.58 | 68.03 | 57.30 | 47.23 | 32.17 | 25.95 | 44.71 | |||||||||||||
| 1983 | 28.02 | 35.20 | 43.19 | 43.87 | 54.79 | 60.07 | 64.77 | 69.56 | 55.25 | 48.73 | 37.80 | 22.05 | 46.94 | |||||||||||||
| 1984 | 21.94 | 23.84 | 37.06 | 44.55 | 51.60 | 58.07 | 67.95 | 69.48 | 56.38 | 44.15 | 36.28 | 17.65 | 44.08 | |||||||||||||
| 1985 | 14.82 | 19.11 | 30.76 | 49.53 | 55.66 | 62.28 | 71.79 | 64.03 | 53.37 | 44.90 | 24.98 | 11.84 | 41.92 | |||||||||||||
| 1986 | 23.61 | 33.96 | a | 45.69 | 45.92 | 55.02 | 66.07 | 64.13 | 69.00 | 53.70 | 48.29 | 37.03 | 27.34 | 47.48 | ||||||||||||
| 1987 | 20.27 | 30.95 | 40.94 | 52.28 | 57.76 | 62.82 | 66.47 | a | 64.68 | 60.29 | a | 49.40 | 37.70 | 29.76 | 47.78 | |||||||||||
| 1988 | 23.29 | b | 30.77 | c | 40.65 | 49.53 | 54.06 | 63.98 | 68.05 | 66.05 | 57.63 | 55.69 | 36.40 | 21.81 | 47.33 | |||||||||||
| 1989 | 19.58 | 16.80 | 37.08 | a | 50.65 | 52.94 | 62.82 | 68.82 | 64.16 | 58.28 | 47.45 | 36.93 | 29.45 | 45.41 | ||||||||||||
| 1990 | 31.35 | 26.21 | 40.34 | 52.05 | 52.05 | 60.82 | 69.74 | 67.50 | 64.55 | 46.48 | 36.80 | 16.94 | 47.07 | |||||||||||||
| 1991 | 18.63 | 33.84 | 40.06 | 45.60 | 51.69 | 58.38 | 68.87 | 70.00 | 61.62 | 48.77 | 34.97 | 28.23 | 46.72 | |||||||||||||
| 1992 | 28.60 | 39.05 | 46.18 | 50.22 | 59.29 | 65.33 | 65.27 | 66.95 | 56.92 | 49.60 | 33.48 | 22.40 | 48.61 | |||||||||||||
| 1993 | 22.10 | 25.38 | 37.16 | 46.08 | 56.82 | 57.75 | 58.15 | 59.97 | 55.03 | 50.53 | 30.22 | 28.48 | 43.97 | |||||||||||||
| 1994 | 29.05 | 25.68 | 40.90 | 50.37 | 57.71 | 61.60 | 70.81 | 68.77 | 61.50 | 46.69 | 29.13 | 21.98 | 47.02 | |||||||||||||
| 1995 | 26.76 | 36.64 | 40.87 | 45.38 | 54.52 | 60.12 | 67.06 | 63.55 | 60.40 | 44.34 | 38.73 | 31.34 | 47.48 | |||||||||||||
| 1996 | 26.03 | 28.05 | 41.29 | 47.03 | 51.85 | 61.38 | 70.27 | 67.66 | 56.65 | 47.45 | 38.00 | 30.73 | 47.20 | |||||||||||||
| 1997 | 28.63 | 29.27 | 41.13 | 45.60 | 57.21 | 61.63 | 66.77 | 68.19 | 61.33 | 47.19 | 38.17 | 24.34 | 47.46 | |||||||||||||
| 1998 | 28.58 | 33.57 | 41.08 | 46.93 | 54.35 | 59.63 | 73.16 | 69.39 | 63.35 | 45.39 | 38.17 | 23.08 | 48.06 | |||||||||||||
| 1999 | 27.66 | 27.79 | 37.06 | 44.32 | 51.53 | 60.78 | 66.50 | 69.11 | 57.02 | 48.02 | 40.38 | 24.53 | 46.23 | |||||||||||||
| 2000 | 25.71 | 32.64 | 40.69 | 50.03 | 55.73 | 62.27 | 68.84 | 68.06 | 57.40 | 46.85 | 31.40 | 27.53 | 47.26 | |||||||||||||
| 2001 | 22.03 | 26.02 | 40.61 | 45.68 | 56.77 | 61.52 | 69.27 | 70.55 | 62.07 | 47.03 | 38.98 | 24.98 | 47.13 | |||||||||||||
| 2002 | 24.29 | 22.23 | 33.98 | 47.62 | 54.21 | 64.35 | 72.00 | 64.73 | 58.90 | 44.21 | 36.28 | 32.23 | 46.25 | |||||||||||||
| 2003 | 31.37 | 34.96 | 43.53 | 46.45 | 54.84 | 63.22 | 73.71 | 70.48 | 60.97 | 51.66 | 32.00 | 31.69 | 49.57 | |||||||||||||
| 2004 | 24.58 | 27.17 | 40.58 | 49.33 | 54.18 | 63.38 | 70.71 | 68.58 | 57.75 | 49.29 | 36.45 | 31.08 | 47.76 | |||||||||||||
| 2005 | 26.32 | 31.66 | 41.89 | 46.67 | 55.39 | 59.23 | 70.32 | 68.32 | 56.93 | 47.92 | 32.57 | 20.61 | 46.49 | |||||||||||||
| 2006 | 28.35 | 23.61 | 36.23 | 47.97 | 55.26 | 63.95 | 73.44 | 65.94 | 58.23 | 45.76 | 38.55 | 24.77 | 46.84 | |||||||||||||
| 2007 | 19.58 | 33.05 | 43.16 | 48.13 | 56.79 | 64.32 | 75.74 | 67.52 | 58.40 | 47.29 | 35.62 | 28.45 | 48.17 | |||||||||||||
| 2008 | 20.05 | 27.52 | 34.77 | 42.72 | 55.11 | 61.15 | 69.39 | 68.03 | 59.08 | 47.65 | 39.25 | 25.94 | 45.89 | |||||||||||||
| 2009 | 22.82 | 27.57 | 37.00 | 46.93 | 55.08 | 62.00 | 70.06 | 68.37 | 62.33 | 43.90 | 34.88 | 20.89 | 45.99 | |||||||||||||
| 2010 | 30.76 | 32.23 | 38.63 | 45.02 | 49.68 | 59.35 | 67.32 | 65.47 | 59.32 | 63.75 | z | ----- | z | ----- | z | 49.75 | ||||||||||
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.75 | z | 69.15 | 72.05 | 64.92 | 50.21 | 34.25 | 27.05 | 52.94 | |||||||
| 2012 | 29.48 | 30.29 | 41.84 | 51.16 | a | 54.90 | 62.73 | 74.32 | 71.73 | 62.88 | 47.18 | 39.38 | 30.18 | 49.67 | ||||||||||||
| 2013 | 16.87 | 29.93 | a | 40.88 | a | 52.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.23 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 24.17 | 29.46 | 38.62 | 46.90 | 54.59 | 61.25 | 68.63 | 67.12 | 58.93 | 47.86 | 35.90 | 27.03 | 46.77 | |||||||||||||
| S.D. | 5.14 | 4.98 | 3.40 | 2.56 | 2.66 | 2.45 | 2.78 | 2.76 | 3.05 | 2.68 | 3.12 | 4.59 | 1.50 | |||||||||||||
| SKEW | -0.47 | -0.44 | -0.32 | -0.08 | 0.05 | 0.34 | -0.16 | -0.03 | 0.15 | 0.40 | -0.77 | -0.69 | -0.36 | |||||||||||||
| MAX | 32.42 | 39.05 | 46.18 | 52.28 | 60.27 | 66.65 | 75.74 | 73.34 | 66.73 | 55.69 | 41.45 | 35.63 | 50.18 | |||||||||||||
| MIN | 9.11 | 16.80 | 30.63 | 41.25 | 48.76 | 56.07 | 58.15 | 59.97 | 53.33 | 41.82 | 24.98 | 11.84 | 41.92 | |||||||||||||
| NO YRS | 72 | 72 | 72 | 74 | 73 | 71 | 74 | 76 | 77 | 74 | 72 | 75 | 58 | |||||||||||||