| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.72 | o | 64.94 | 64.60 | 54.66 | 45.00 | 37.58 | 53.36 | ||||||
| 1944 | 37.58 | 41.26 | 44.24 | 49.17 | 54.63 | 60.20 | 66.42 | 65.10 | 64.53 | 57.29 | 43.20 | 37.02 | 51.72 | |||||||||||||
| 1945 | 40.23 | 43.30 | 43.55 | 48.50 | 57.29 | 60.42 | 67.69 | 66.56 | 60.60 | 53.18 | 45.65 | 41.17 | a | 52.34 | ||||||||||||
| 1946 | 40.18 | 42.18 | 45.11 | 50.47 | 57.98 | 59.90 | 66.77 | 66.69 | 60.37 | 48.76 | 43.17 | 40.76 | 51.86 | |||||||||||||
| 1947 | 36.32 | 44.11 | 48.27 | 52.88 | a | 59.39 | 59.77 | 64.66 | 63.95 | 62.13 | 54.97 | 46.45 | 41.48 | 52.87 | ||||||||||||
| 1948 | 38.26 | 39.36 | 43.63 | 46.72 | 53.90 | 63.73 | b | 64.47 | a | 64.55 | 61.18 | 52.13 | 42.92 | 35.79 | 50.55 | |||||||||||
| 1949 | 27.16 | 40.25 | 45.90 | 52.60 | 57.61 | 60.85 | 64.92 | 65.42 | 62.25 | 48.40 | 48.87 | 39.76 | 51.17 | |||||||||||||
| 1950 | 31.16 | 38.68 | 43.17 | a | 48.05 | 54.52 | 60.92 | 67.44 | 68.63 | 62.83 | 53.39 | 47.13 | 46.69 | 51.88 | ||||||||||||
| 1951 | 40.19 | 43.39 | 41.66 | 53.53 | a | 55.42 | 63.83 | 66.48 | 66.03 | 63.12 | 52.71 | 45.60 | 38.85 | 52.57 | ||||||||||||
| 1952 | 38.19 | 42.43 | a | 43.12 | a | 51.22 | 55.50 | a | 57.87 | 67.29 | 65.84 | 64.77 | 57.69 | 39.35 | 40.92 | 52.02 | ||||||||||
| 1953 | 46.08 | a | 42.89 | 44.45 | 48.72 | 52.55 | 56.90 | a | 65.53 | 65.55 | 63.45 | 54.05 | 48.87 | 43.58 | 52.72 | |||||||||||
| 1954 | 40.26 | 42.96 | 43.03 | 50.08 | 55.60 | a | 56.72 | 62.98 | 62.56 | 59.92 | 51.45 | 49.28 | 40.21 | 51.26 | ||||||||||||
| 1955 | 38.85 | 39.82 | 41.31 | 44.77 | 53.15 | 60.22 | 61.57 | a | 64.97 | 61.43 | 53.34 | 43.08 | 41.63 | 50.34 | ||||||||||||
| 1956 | 41.44 | 36.36 | a | 44.23 | 50.43 | 57.35 | 58.41 | a | 66.50 | b | 65.40 | 62.78 | 51.61 | 42.47 | 40.35 | 51.45 | ||||||||||
| 1957 | 31.87 | 41.91 | 46.19 | 51.65 | 57.67 | a | 61.87 | 64.31 | 63.73 | 65.42 | 53.18 | 43.07 | 42.97 | 51.98 | ||||||||||||
| 1958 | 42.23 | 48.02 | 44.48 | 49.53 | 60.11 | 63.27 | 70.68 | 70.34 | 62.87 | 55.44 | 46.83 | 46.27 | 55.01 | |||||||||||||
| 1959 | 42.97 | 41.59 | 46.18 | 51.62 | 53.40 | 61.10 | 68.10 | 66.19 | 59.35 | 55.47 | 44.83 | 40.77 | 52.63 | |||||||||||||
| 1960 | 37.44 | 42.34 | 46.02 | 49.92 | 53.21 | 62.52 | 68.32 | 64.37 | 61.98 | 54.48 | 45.60 | 39.34 | 52.13 | |||||||||||||
| 1961 | 42.95 | 45.98 | 45.69 | 49.63 | 54.15 | 63.77 | 67.05 | 69.34 | 59.30 | 53.10 | 42.12 | 41.85 | 52.91 | |||||||||||||
| 1962 | 36.60 | 41.64 | 43.56 | 51.93 | 51.15 | 59.88 | 65.45 | 64.63 | 63.27 | 53.27 | 47.32 | 42.19 | 51.74 | |||||||||||||
| 1963 | 34.65 | 48.07 | 45.10 | 46.33 | 55.08 | 59.85 | 62.32 | 65.29 | 64.18 | 54.69 | 46.13 | 40.35 | 51.84 | |||||||||||||
| 1964 | 41.08 | 40.88 | 43.19 | 47.28 | 51.94 | 58.42 | 65.37 | 64.13 | 59.82 | 54.34 | 42.38 | 40.90 | 50.81 | |||||||||||||
| 1965 | 40.13 | 43.12 | 46.92 | 50.70 | 53.05 | 59.42 | 66.63 | 66.61 | 60.78 | 55.50 | 48.78 | 38.84 | 52.54 | |||||||||||||
| 1966 | 40.31 | 41.20 | 44.84 | 51.92 | 55.11 | 60.27 | 64.53 | 66.23 | 63.08 | 53.19 | 46.50 | 43.95 | 52.59 | |||||||||||||
| 1967 | 42.76 | 43.46 | 43.53 | 45.12 | 54.82 | 63.32 | 67.68 | 71.15 | 65.67 | 53.35 | 46.88 | 40.98 | 53.23 | |||||||||||||
| 1968 | 40.73 | 47.33 | 47.55 | 47.73 | 53.47 | 60.32 | 66.15 | 64.00 | 61.12 | 51.92 | 46.87 | 38.77 | 52.16 | |||||||||||||
| 1969 | 34.76 | 38.34 | 45.55 | 48.08 | 57.47 | 62.87 | 64.44 | 63.68 | 61.63 | 50.66 | 45.37 | 42.05 | 51.24 | |||||||||||||
| 1970 | 41.03 | 44.48 | 46.34 | 46.03 | 54.79 | 63.63 | 67.05 | 65.60 | 58.62 | 51.89 | 45.42 | 39.58 | 52.04 | |||||||||||||
| 1971 | 39.27 | 41.05 | 42.06 | 47.30 | 54.74 | 57.25 | 66.26 | 68.05 | 59.38 | 50.11 | 44.07 | 38.94 | 50.71 | |||||||||||||
| 1972 | 38.95 | 43.00 | 47.79 | 45.98 | 56.27 | 60.67 | 68.40 | 68.40 | 59.10 | 52.08 | 46.35 | 34.97 | 51.83 | |||||||||||||
| 1973 | 37.53 | 43.93 | 43.77 | 50.05 | 56.06 | 61.30 | 66.55 | 63.85 | 61.83 | 53.00 | 43.37 | 43.55 | 52.07 | |||||||||||||
| 1974 | 36.15 | 40.46 | 45.29 | 48.33 | 53.31 | 61.15 | 64.74 | 67.13 | 66.40 | 54.15 | 46.18 | 43.48 | 52.23 | |||||||||||||
| 1975 | 43.26 | 40.96 | 43.76 | 44.92 | 54.00 | 60.03 | 66.11 | 63.32 | 63.98 | 52.65 | 43.47 | 41.74 | 51.52 | |||||||||||||
| 1976 | 40.76 | 40.86 | 42.82 | 46.75 | 54.39 | 57.63 | 64.77 | 63.95 | 63.32 | 54.44 | 47.08 | 37.39 | 51.18 | |||||||||||||
| 1977 | 38.13 | 44.25 | 43.66 | 49.90 | a | 51.21 | 61.78 | 64.74 | 69.89 | 59.47 | 53.95 | 43.65 | 43.03 | 51.97 | ||||||||||||
| 1978 | 43.19 | 44.91 | 48.97 | 48.68 | 53.02 | 62.85 | 66.55 | 66.45 | 59.77 | 54.82 | 40.52 | 36.29 | 52.17 | |||||||||||||
| 1979 | 31.60 | 41.23 | 47.68 | 49.23 | 56.29 | 60.93 | 66.92 | 65.10 | 63.53 | 57.18 | 43.42 | 43.11 | 52.18 | |||||||||||||
| 1980 | 36.65 | 43.07 | 44.94 | 50.50 | 53.37 | 57.37 | 66.18 | 63.82 | 62.05 | 55.08 | 47.38 | 42.81 | 51.93 | |||||||||||||
| 1981 | 41.31 | 42.93 | 46.66 | 49.82 | 54.15 | 59.97 | 65.74 | 68.85 | 63.23 | 51.90 | 46.52 | 42.94 | 52.83 | |||||||||||||
| 1982 | 37.08 | 41.98 | 44.56 | 46.53 | 55.34 | 62.37 | 64.69 | 67.32 | 62.75 | 54.34 | 42.97 | 41.35 | 51.77 | |||||||||||||
| 1983 | 42.48 | 45.59 | 49.66 | 51.25 | 58.15 | 60.40 | 64.15 | 67.66 | 61.90 | 54.82 | 48.35 | 38.19 | 53.55 | |||||||||||||
| 1984 | 43.02 | 45.47 | 50.02 | 49.00 | 54.53 | 59.20 | 67.42 | 67.03 | 62.85 | 52.40 | 45.27 | 38.85 | 52.92 | |||||||||||||
| 1985 | 36.06 | 41.73 | 45.02 | 53.18 | 56.06 | 62.70 | 71.11 | 66.61 | 60.35 | 53.47 | 38.40 | 33.32 | 51.50 | |||||||||||||
| 1986 | 42.85 | 44.12 | 51.16 | 49.77 | 55.32 | 65.03 | 64.31 | 70.89 | 60.53 | 55.74 | 46.72 | 39.68 | 53.84 | |||||||||||||
| 1987 | 38.87 | 43.86 | 47.44 | 53.38 | 58.27 | 63.42 | 64.44 | 68.16 | 63.57 | 58.97 | 47.13 | 38.81 | 53.86 | |||||||||||||
| 1988 | 38.50 | 43.34 | 47.05 | 51.53 | 54.11 | 59.98 | 68.08 | 67.35 | 63.75 | 56.87 | p | 47.32 | 41.15 | 52.92 | ||||||||||||
| 1989 | 41.90 | 35.45 | i | 46.16 | 56.30 | j | 55.82 | i | 62.93 | 65.63 | l | 65.60 | 65.55 | k | 54.98 | i | 46.03 | j | 39.92 | k | 54.15 | |||||
| 1990 | 42.65 | k | 39.08 | j | 48.89 | i | 54.24 | i | 54.48 | i | 61.95 | i | 69.64 | j | 68.94 | 66.00 | l | 54.00 | j | 44.82 | k | 38.64 | m | 68.94 | ||
| 1991 | 41.05 | k | 49.25 | j | 44.00 | j | 49.69 | i | 53.80 | i | 58.10 | j | 68.66 | i | 69.36 | i | 70.03 | j | 55.98 | i | 47.72 | l | 42.65 | k | 9999.00 | |
| 1992 | 46.40 | j | 48.55 | j | 52.82 | i | 54.95 | 60.95 | k | 66.05 | 68.98 | 71.69 | j | 64.76 | i | 55.17 | j | 45.50 | k | 39.33 | j | 63.33 | ||||
| 1993 | 36.18 | n | 39.71 | i | 50.39 | 51.53 | 58.95 | l | 60.98 | 62.98 | j | 67.23 | i | 65.10 | i | 57.92 | k | 43.03 | m | 41.08 | m | 54.30 | ||||
| 1994 | 43.39 | l | 41.97 | k | 49.50 | a | 53.00 | j | 59.21 | j | 60.38 | a | 70.66 | l | 68.34 | 66.79 | i | 54.28 | k | 42.61 | k | 43.50 | j | 59.41 | ||
| 1995 | 43.39 | l | 51.11 | n | 47.89 | i | 50.83 | j | 57.14 | i | 62.43 | 69.22 | k | 66.57 | b | 66.88 | j | 54.55 | j | 51.50 | k | 42.70 | k | 64.50 | ||
| 1996 | 41.86 | m | 42.82 | j | 48.26 | j | 51.89 | k | 53.88 | j | 58.87 | k | 67.50 | i | 66.25 | i | 57.78 | l | 52.21 | j | 46.25 | l | 41.28 | m | 9999.00 | |
| 1997 | 41.40 | k | 44.42 | i | 46.14 | j | 49.95 | 60.38 | n | 61.80 | j | 67.75 | i | 70.60 | j | 65.79 | i | 53.64 | j | 50.64 | l | 41.08 | l | 49.95 | ||
| 1998 | 44.68 | n | 45.83 | j | 48.37 | l | 51.20 | 56.12 | k | 62.87 | 71.32 | i | 69.16 | l | 62.31 | i | 51.88 | k | 48.19 | n | 42.65 | n | 57.03 | |||
| 1999 | 43.86 | m | 44.75 | l | 45.55 | i | 50.00 | k | 54.68 | l | 61.98 | h | 67.95 | k | 69.48 | i | 66.36 | i | 56.58 | k | 50.39 | l | 43.24 | j | 9999.00 | |
| 2000 | 41.20 | k | 47.20 | i | 47.52 | i | 55.25 | j | 57.52 | i | 65.30 | h | 67.50 | l | 70.36 | i | 65.68 | k | 55.61 | l | 44.74 | m | 41.35 | k | 9999.00 | |
| 2001 | 42.57 | j | 43.08 | j | 49.39 | l | 51.14 | l | 58.41 | i | 60.93 | i | 68.15 | n | 68.07 | h | 64.25 | l | 53.67 | m | 47.60 | j | 41.78 | k | 9999.00 | |
| 2002 | 41.41 | i | 44.39 | j | 44.12 | j | 52.48 | 54.76 | h | 64.40 | j | 70.50 | j | 69.05 | i | 65.71 | k | 55.34 | i | 47.71 | m | 43.45 | j | 52.48 | ||
| 2003 | 45.43 | j | 42.89 | i | 48.14 | j | 48.03 | j | 60.75 | s | 64.80 | j | 70.70 | h | 69.60 | k | 65.78 | l | 58.80 | i | 43.07 | p | 42.18 | l | 9999.00 | |
| 2004 | 40.53 | k | 44.03 | k | 51.24 | j | 51.70 | h | 57.83 | k | 62.03 | n | 69.68 | n | 69.93 | j | 63.33 | o | 55.50 | p | 45.31 | n | 42.39 | q | 9999.00 | |
| 2005 | 40.46 | q | 41.10 | m | 49.18 | l | 49.97 | m | 56.03 | n | 59.90 | o | 69.04 | q | 69.12 | n | 61.29 | p | 53.32 | t | 43.44 | l | 36.22 | o | 9999.00 | |
| 2006 | 40.91 | i | 40.75 | h | 41.91 | i | 49.28 | j | 55.88 | k | 61.00 | i | 66.15 | n | 63.62 | k | 61.77 | o | 52.23 | p | ----- | z | ----- | z | 9999.00 | |
| 2007 | 37.25 | s | 40.50 | m | 44.28 | v | 47.03 | n | 53.20 | p | 58.25 | n | ----- | z | 64.05 | u | 60.29 | p | 50.59 | t | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | 43.20 | n | 44.50 | p | 47.88 | n | 56.04 | s | ----- | z | 65.55 | t | 65.21 | s | ----- | z | 52.83 | p | ----- | z | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.45 | 33.40 | 38.43 | |||
| 2010 | 43.50 | 44.07 | 45.08 | 47.42 | 51.65 | 57.42 | 66.12 | n | 64.60 | a | 60.87 | 51.92 | 43.28 | 41.48 | 50.12 | |||||||||||
| 2011 | 39.63 | 38.61 | 44.92 | 45.30 | 51.45 | 58.58 | 63.13 | 65.55 | 63.68 | 52.82 | 43.60 | 37.76 | 50.42 | |||||||||||||
| 2012 | 39.50 | 40.10 | 42.18 | 50.18 | 53.39 | 57.00 | 64.53 | 66.15 | 61.03 | 52.87 | 45.52 | 41.15 | 51.13 | |||||||||||||
| 2013 | 35.23 | 41.50 | 53.25 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.36 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.02 | 42.50 | 45.44 | 49.50 | 54.90 | 60.79 | 66.01 | 66.25 | 62.13 | 53.56 | 45.06 | 40.36 | 52.07 | |||||||||||||
| S.D. | 3.66 | 2.41 | 2.34 | 2.45 | 2.13 | 2.21 | 1.93 | 2.04 | 1.90 | 2.07 | 2.42 | 2.83 | 0.94 | |||||||||||||
| SKEW | -0.93 | 0.11 | 0.56 | -0.10 | 0.37 | 0.03 | 0.26 | 0.54 | 0.11 | 0.05 | -0.50 | -0.39 | 0.67 | |||||||||||||
| MAX | 46.08 | 48.07 | 51.16 | 54.95 | 60.11 | 66.05 | 71.11 | 71.15 | 66.40 | 58.97 | 49.28 | 46.69 | 55.01 | |||||||||||||
| MIN | 27.16 | 36.36 | 41.31 | 44.77 | 51.15 | 56.72 | 61.57 | 62.56 | 58.62 | 48.40 | 38.40 | 33.32 | 50.34 | |||||||||||||
| NO YRS | 50 | 49 | 51 | 53 | 48 | 54 | 48 | 53 | 49 | 48 | 50 | 50 | 46 | |||||||||||||