YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | 56.87 | a | 68.23 | 71.58 | 90.07 | 90.65 | 86.77 | 82.43 | 72.68 | 60.14 | i | 51.71 | 74.55 | c | ||||||||
1936 | 52.52 | 50.10 | 61.61 | 73.40 | 80.00 | 89.30 | 88.77 | 86.23 | 78.00 | 68.07 | a | 56.28 | a | 53.56 | d | 69.82 | ||||||||||
1937 | 39.00 | 47.46 | b | 55.87 | a | 66.93 | 76.52 | 81.57 | 86.55 | 88.84 | 83.50 | 74.58 | 62.10 | 48.97 | b | 67.66 | ||||||||||
1938 | 52.52 | 50.14 | 55.10 | 67.30 | 74.52 | 86.30 | 88.81 | 86.71 | 83.68 | e | 72.19 | 57.97 | 52.77 | 69.00 | ||||||||||||
1939 | 47.48 | 42.82 | 60.94 | 72.30 | 79.97 | 87.40 | 92.65 | 88.52 | 78.57 | 71.55 | 62.38 | a | 60.19 | 70.40 | ||||||||||||
1940 | 53.22 | h | 52.28 | 64.10 | 68.03 | a | 79.94 | 90.00 | 92.14 | b | 85.35 | 77.00 | 66.67 | m | 55.33 | u | ----- | z | 76.10 | d | ||||||
1941 | ----- | z | ----- | z | ----- | z | 58.90 | a | ----- | z | 81.17 | 88.26 | 84.94 | 79.10 | 64.32 | 67.07 | o | 49.62 | g | 76.11 | f | |||||
1942 | 53.10 | 50.46 | 57.37 | a | 66.43 | 75.73 | a | 87.00 | 93.13 | 86.61 | 83.40 | ----- | z | ----- | z | ----- | z | 72.58 | c | |||||||
1943 | ----- | z | ----- | z | 62.18 | c | 72.57 | 79.03 | b | 84.10 | 91.77 | 84.13 | 85.54 | b | ----- | z | 64.46 | b | 48.52 | b | 74.70 | c | ||||
1944 | 49.70 | a | 48.52 | 55.31 | b | 62.48 | c | 75.40 | a | 82.38 | a | 88.65 | 89.60 | a | 82.30 | 73.52 | d | 55.10 | 53.58 | 68.04 | ||||||
1945 | 51.06 | 54.41 | a | 51.42 | 66.19 | c | 75.71 | g | 84.80 | e | 89.03 | 86.52 | 82.10 | 72.44 | m | 62.20 | 51.23 | a | 67.90 | b | ||||||
1946 | 50.33 | d | ----- | z | ----- | z | 73.76 | a | 76.73 | a | 89.80 | 89.52 | b | 85.58 | 83.38 | a | ----- | z | 67.60 | y | 56.19 | 75.66 | d | |||
1947 | 49.39 | 60.93 | a | 63.97 | b | 68.76 | a | 80.66 | b | 85.43 | 91.10 | 84.90 | 84.07 | 71.50 | c | 53.00 | h | 49.77 | e | 71.86 | a | |||||
1948 | 60.57 | q | 48.31 | c | 50.17 | g | 70.80 | o | 80.31 | o | 88.43 | g | 92.14 | i | 87.22 | h | 85.88 | f | 69.45 | k | 57.12 | e | 53.00 | l | 52.71 | j |
1949 | 37.42 | g | 46.92 | d | 59.08 | s | 72.57 | i | 74.91 | h | 83.28 | e | 87.84 | f | 88.00 | g | 82.69 | n | 68.50 | s | 71.10 | i | 48.80 | k | 65.10 | j |
1950 | 50.95 | l | 57.35 | k | 61.57 | h | 74.68 | h | 82.08 | s | 89.30 | c | 86.00 | 89.46 | g | 82.61 | g | 82.14 | j | 68.89 | b | 62.77 | i | 81.40 | i | |
1951 | 52.23 | e | 55.07 | a | 58.08 | f | 66.33 | c | 76.22 | d | 87.05 | i | 94.79 | c | 87.68 | f | 88.39 | l | 71.52 | j | 59.90 | i | 48.85 | d | 65.58 | f |
1952 | 48.68 | c | 53.30 | f | 50.75 | c | 66.15 | c | 79.61 | h | 86.37 | c | 88.96 | d | 89.96 | h | 86.18 | h | 81.19 | j | 57.24 | i | 48.50 | m | 68.18 | g |
1953 | 57.88 | o | ----- | z | 65.29 | q | 68.96 | b | 71.70 | a | 88.86 | a | 89.27 | a | 88.32 | c | 88.42 | f | 72.83 | g | 66.00 | h | 51.91 | i | 81.42 | g |
1954 | 53.36 | f | 63.38 | b | 57.22 | d | 75.27 | 80.75 | c | 86.38 | a | 89.97 | 86.62 | e | 84.41 | c | 76.15 | e | 67.76 | e | 55.48 | h | 76.79 | b | ||
1955 | 44.33 | d | 49.12 | b | 62.04 | c | 67.43 | b | 75.38 | b | 84.53 | 87.90 | b | 86.61 | c | 86.89 | c | 77.97 | a | 60.37 | c | 55.07 | b | 69.80 | ||
1956 | 54.38 | b | 50.32 | a | 65.90 | b | 65.07 | b | 80.77 | a | 90.97 | a | 88.20 | a | 87.37 | d | 89.72 | a | 72.22 | d | 62.07 | c | 54.43 | c | 71.79 | |
1957 | 46.37 | a | 59.14 | 59.55 | 65.03 | a | 70.03 | 86.55 | a | 88.71 | 85.86 | i | 85.73 | 66.11 | d | 54.46 | f | 55.90 | 68.31 | b | ||||||
1958 | 52.63 | a | 56.44 | c | 50.90 | a | 65.80 | 81.93 | d | 88.34 | a | 92.31 | b | 89.67 | a | 80.86 | a | 73.17 | b | 59.66 | a | 60.72 | b | 71.04 | ||
1959 | 55.73 | a | 51.12 | c | 64.10 | 72.54 | b | 75.00 | 88.31 | a | 91.50 | a | 83.81 | 82.03 | a | 74.13 | 61.76 | a | 54.08 | g | 72.73 | a | ||||
1960 | 46.27 | a | 48.71 | a | 65.10 | 70.50 | 77.87 | a | 89.38 | a | 93.17 | b | 90.06 | 85.67 | 67.80 | a | 61.16 | e | 50.00 | 70.47 | ||||||
1961 | 55.35 | 57.00 | 58.97 | a | 69.87 | 76.84 | 89.80 | 91.72 | b | 85.37 | a | 79.13 | 71.13 | 54.72 | a | 47.27 | a | 69.76 | ||||||||
1962 | 49.50 | a | 52.43 | 54.19 | e | 75.39 | b | 73.73 | a | 84.86 | a | 89.39 | 91.71 | 83.18 | b | 73.17 | a | 63.67 | f | 56.88 | f | 72.76 | b | |||
1963 | 49.52 | f | 61.00 | b | 59.48 | b | 65.37 | 80.23 | a | 83.33 | c | 92.50 | a | 83.65 | 83.57 | 74.84 | 60.46 | b | 55.17 | h | 74.44 | b | ||||
1964 | 49.86 | b | 52.54 | c | 55.39 | 63.80 | 75.07 | a | 83.36 | b | 89.65 | 84.84 | 80.13 | 78.60 | a | 56.41 | a | 51.30 | h | 69.97 | a | |||||
1965 | 54.31 | e | 53.56 | a | 54.87 | 62.52 | a | 70.40 | a | 78.47 | 86.53 | a | 87.23 | 76.53 | 77.26 | 60.69 | a | 49.36 | f | 69.31 | a | |||||
1966 | 46.92 | f | 48.43 | e | 62.97 | a | 72.23 | 80.06 | 85.17 | 89.19 | 87.23 | 81.40 | 71.90 | 63.07 | a | 51.89 | c | 72.14 | a | |||||||
1967 | 52.77 | e | 58.57 | 63.62 | b | 61.80 | 75.13 | 80.30 | 86.58 | 84.41 | b | 80.27 | 75.83 | a | 63.44 | c | 44.60 | k | 71.16 | a | ||||||
1968 | 48.82 | i | 54.62 | m | 61.10 | b | 63.80 | 75.48 | 85.77 | 86.68 | 82.80 | a | 83.37 | 73.29 | 59.13 | 49.21 | c | 72.06 | b | |||||||
1969 | 51.74 | d | 50.17 | j | 53.20 | f | 68.90 | a | 79.27 | a | 83.60 | 89.23 | 90.80 | f | 82.87 | 67.52 | d | 58.03 | 54.77 | a | 70.66 | c | ||||
1970 | 51.75 | c | 57.21 | i | 56.23 | 61.41 | a | 78.68 | 86.30 | 90.90 | 88.26 | 78.87 | 67.29 | 61.88 | e | 49.60 | f | 72.16 | b | |||||||
1971 | 53.80 | f | 55.71 | g | 63.77 | 67.00 | 71.10 | 86.73 | 92.07 | b | 84.94 | 82.23 | 65.35 | 59.34 | a | 43.85 | k | 74.73 | c | |||||||
1972 | 53.14 | j | 59.18 | g | 72.81 | 72.14 | a | 79.29 | 85.13 | 92.68 | 87.74 | 82.23 | 64.36 | c | 51.90 | a | 47.04 | g | 76.47 | c | ||||||
1973 | 47.17 | b | 49.93 | a | 47.84 | 63.03 | 77.42 | 86.47 | 90.61 | 88.74 | 84.47 | 75.52 | 58.63 | 56.05 | j | 69.98 | a | |||||||||
1974 | 47.73 | a | 55.67 | d | 61.53 | a | 68.50 | 79.93 | a | 93.23 | 87.00 | 87.06 | 81.63 | 70.37 | a | 59.30 | c | 49.95 | j | 72.00 | a | |||||
1975 | 50.27 | a | 51.68 | c | 54.11 | d | 59.20 | 74.52 | 85.77 | 87.29 | 89.06 | 81.27 | 73.67 | a | 62.00 | 54.88 | f | 69.89 | a | |||||||
1976 | 54.52 | d | 54.40 | d | 57.83 | a | 65.21 | b | 76.77 | 86.83 | 87.61 | 87.03 | 77.33 | 68.87 | 64.54 | b | 56.45 | i | 71.00 | a | ||||||
1977 | 48.54 | g | 60.00 | b | 59.32 | f | 70.60 | 71.06 | 87.47 | 89.00 | 87.42 | 82.07 | 73.93 | b | 63.97 | 56.39 | h | 76.17 | c | |||||||
1978 | 49.77 | a | 50.40 | h | 60.19 | d | 65.63 | 76.52 | 88.50 | 91.13 | 87.29 | 81.62 | a | 77.25 | c | 56.34 | a | 49.58 | s | 73.42 | b | |||||
1979 | 41.86 | c | 51.62 | b | 56.58 | g | 69.28 | e | 74.24 | f | 87.71 | f | 94.90 | b | 88.28 | b | 92.89 | c | 82.47 | a | 60.56 | e | 56.15 | e | 70.89 | c |
1980 | 52.91 | h | 57.30 | f | 56.82 | i | 68.10 | j | 73.07 | d | 91.65 | j | 96.88 | o | 87.85 | e | 85.74 | c | 75.57 | c | 66.46 | b | 60.62 | b | 74.89 | f |
1981 | 56.87 | 59.00 | c | 58.00 | a | 72.32 | e | 75.29 | c | 90.83 | a | 90.03 | a | 88.19 | 81.27 | 68.00 | d | 64.20 | 56.68 | 71.72 | ||||||
1982 | 48.48 | 54.96 | 56.28 | b | 62.25 | r | 76.50 | k | 85.80 | 88.80 | a | 86.70 | a | 81.74 | c | 71.84 | 56.74 | c | 51.00 | 68.23 | b | |||||
1983 | 55.06 | 53.86 | 54.65 | 60.10 | 76.23 | 83.83 | 88.58 | 87.00 | 84.83 | 72.71 | 59.53 | 52.90 | a | 69.11 | ||||||||||||
1984 | 56.84 | 58.59 | 65.26 | 67.86 | a | 85.10 | 85.33 | 88.74 | 86.39 | 84.97 | a | 67.20 | a | 62.07 | c | 48.97 | a | 71.44 | ||||||||
1985 | 49.97 | 53.39 | 58.16 | 72.10 | 78.03 | 90.20 | 91.13 | 90.00 | 78.59 | a | 71.17 | b | 56.55 | a | 58.55 | 70.65 | ||||||||||
1986 | 62.52 | b | 54.78 | a | 62.58 | 67.46 | b | 76.03 | 84.91 | g | 83.63 | d | 84.85 | e | 74.61 | b | 67.17 | a | 59.11 | c | 52.68 | c | 67.76 | a | ||
1987 | 48.47 | a | 51.61 | 55.96 | d | 73.11 | b | ----- | z | 88.31 | a | 86.35 | 84.29 | 80.80 | 73.40 | a | 56.10 | 47.00 | 67.76 | a | ||||||
1988 | 48.97 | a | 59.36 | a | 61.60 | a | 66.54 | b | 76.52 | b | 84.63 | 88.84 | 83.90 | a | 80.64 | b | 77.39 | 58.93 | a | 49.84 | 69.76 | |||||
1989 | 49.19 | 54.31 | b | 68.30 | a | 76.50 | 79.84 | 87.83 | 90.58 | 86.17 | a | 83.87 | 71.19 | 63.73 | 56.43 | a | 72.33 | |||||||||
1990 | 49.55 | 52.04 | b | 60.67 | a | 69.30 | 74.77 | 89.20 | 86.45 | 84.23 | 80.07 | 72.48 | 61.14 | b | 47.83 | a | 68.98 | |||||||||
1991 | 50.97 | a | 61.75 | 52.43 | a | 67.28 | a | 73.39 | 82.00 | c | 89.45 | 87.53 | a | 81.37 | 74.42 | 58.38 | a | 49.39 | 69.03 | |||||||
1992 | 50.23 | 55.25 | a | 56.90 | 72.93 | 73.87 | a | 81.00 | 84.67 | a | 83.03 | 81.47 | 72.77 | 56.70 | 46.65 | 67.96 | ||||||||||
1993 | 48.87 | 48.79 | 62.33 | a | 69.50 | b | 77.03 | 84.41 | a | 86.74 | 84.13 | 82.44 | c | 68.65 | 55.70 | 52.45 | 68.42 | |||||||||
1994 | 55.37 | a | 51.63 | a | 62.28 | b | 65.67 | f | 73.43 | a | 89.14 | a | 89.19 | 88.20 | a | 80.86 | a | 67.94 | 52.45 | a | 50.94 | 69.22 | a | |||
1995 | 45.63 | a | 60.85 | b | 58.60 | a | 62.83 | 68.34 | b | 81.89 | c | 88.45 | 88.32 | 82.12 | d | 74.52 | 67.19 | c | 55.14 | c | 69.49 | |||||
1996 | 54.42 | 58.89 | a | 62.77 | 71.79 | b | 80.07 | a | 88.10 | 88.84 | 87.13 | a | 75.93 | a | 69.41 | b | 60.37 | c | 53.10 | a | 70.90 | |||||
1997 | 47.16 | 54.15 | a | 66.53 | a | 63.72 | a | 80.00 | 82.33 | 88.39 | 85.00 | 80.87 | 69.30 | a | 58.79 | a | 47.80 | a | 68.67 | |||||||
1998 | 52.03 | 45.71 | 56.23 | 61.32 | b | 71.32 | c | 79.96 | b | 87.10 | 87.42 | 77.43 | 68.19 | d | 57.85 | c | 51.52 | 66.34 | ||||||||
1999 | 54.77 | a | 58.75 | 62.48 | b | 59.22 | c | 74.42 | 83.74 | c | 85.20 | f | 83.39 | c | 78.70 | c | 75.48 | 67.82 | b | 52.77 | 68.32 | a | ||||
2000 | 53.59 | b | 57.58 | e | 58.10 | a | 72.38 | a | 81.69 | b | 87.17 | a | 90.79 | c | 86.27 | a | 84.61 | b | 65.32 | f | 52.37 | c | 56.89 | d | 71.04 | a |
2001 | 47.83 | a | 53.04 | b | 63.11 | c | 65.07 | a | 82.19 | d | 87.67 | c | 87.97 | 85.60 | f | 84.35 | d | 71.77 | 59.11 | b | 44.83 | y | 70.21 | b | ||
2002 | ----- | z | 66.00 | n | 64.03 | a | 74.44 | c | 81.07 | b | 91.77 | 91.84 | 89.21 | c | 81.96 | b | 69.52 | b | 62.30 | c | 50.93 | a | 75.71 | b | ||
2003 | 63.00 | 55.41 | a | 61.50 | a | 66.88 | e | 81.32 | c | 87.90 | a | 93.76 | b | 88.50 | c | 86.65 | d | 80.46 | e | 58.10 | 53.64 | f | 74.86 | a | ||
2004 | 52.57 | a | 49.64 | a | 71.31 | b | 67.52 | a | 80.18 | c | 87.79 | a | 90.07 | a | 87.10 | b | 83.04 | d | 70.56 | f | 57.23 | h | 55.93 | b | 72.51 | b |
2005 | 51.87 | a | 54.04 | 58.90 | a | 70.21 | b | 78.84 | 84.54 | b | 92.87 | a | 85.71 | 84.00 | b | 74.57 | c | 65.38 | a | 58.83 | a | 71.65 | ||||
2006 | 58.56 | m | 61.89 | a | 55.29 | 71.75 | b | 81.93 | a | 89.47 | 88.52 | 85.45 | 80.23 | ----- | z | 66.33 | c | 52.58 | e | 73.34 | b | |||||
2007 | 50.03 | b | 56.65 | b | 68.97 | b | 71.04 | b | 78.96 | g | 90.10 | a | 91.21 | b | 88.37 | d | 83.41 | a | 74.67 | a | 69.47 | 49.58 | g | 74.39 | b | |
2008 | 48.00 | e | 55.21 | a | 66.19 | 71.50 | b | 74.93 | a | 88.86 | b | 88.68 | c | 87.45 | 83.97 | a | 77.47 | a | 68.33 | 51.18 | c | 71.81 | ||||
2009 | 56.76 | b | 59.12 | d | 64.81 | d | 69.39 | b | 82.17 | a | 82.21 | b | 92.37 | a | 90.84 | 84.35 | d | 71.90 | a | ----- | z | 47.92 | g | 75.39 | b | |
2010 | 51.88 | e | 51.81 | b | 60.35 | ----- | z | 74.03 | b | 86.79 | a | 89.39 | 86.23 | 88.15 | c | 71.23 | 59.90 | 54.89 | d | 70.42 | a | |||||
2011 | 54.30 | d | 53.68 | c | 66.18 | c | 70.50 | 74.79 | c | 87.47 | 89.97 | 91.84 | 84.90 | 74.68 | 58.10 | 48.65 | 71.25 | |||||||||
2012 | 57.87 | 55.38 | 63.29 | 73.07 | 80.85 | d | 92.33 | i | 87.65 | 88.94 | 83.27 | 76.14 | b | 67.93 | 50.97 | 71.40 | a | |||||||||
2013 | 50.90 | 52.39 | 67.23 | 72.43 | 78.87 | a | 91.30 | 88.23 | 87.00 | 81.10 | 71.45 | 62.70 | 52.61 | 71.35 | ||||||||||||
2014 | 61.35 | 61.30 | a | 65.93 | a | 73.80 | e | 76.32 | l | 90.70 | 90.55 | 84.13 | 83.17 | 77.87 | 65.13 | 52.84 | 73.34 | a | ||||||||
2015 | 55.97 | 64.64 | 69.19 | 70.57 | 71.26 | 88.97 | 87.29 | 89.45 | 85.53 | 74.23 | 58.90 | 57.57 | q | 74.18 | a | |||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.49 | 54.27 | 60.45 | 68.22 | 76.89 | 86.45 | 89.53 | 86.85 | 82.33 | 72.44 | 60.71 | 52.68 | 69.95 | |||||||||||||
S.D. | 4.37 | 4.63 | 5.10 | 4.24 | 3.59 | 3.14 | 2.27 | 2.04 | 3.08 | 3.83 | 4.11 | 3.60 | 1.50 | |||||||||||||
SKEW | 0.16 | 0.08 | -0.03 | -0.30 | -0.19 | -0.32 | 0.12 | 0.14 | 0.26 | 0.01 | 0.17 | 0.43 | -0.39 | |||||||||||||
MAX | 63.00 | 64.64 | 72.81 | 76.50 | 85.10 | 93.23 | 94.90 | 91.84 | 92.89 | 82.47 | 69.47 | 60.72 | 72.33 | |||||||||||||
MIN | 39.00 | 42.82 | 47.84 | 58.90 | 68.34 | 78.47 | 83.63 | 82.80 | 74.61 | 64.32 | 51.90 | 46.65 | 66.34 | |||||||||||||
YRS | 63 | 66 | 70 | 74 | 70 | 75 | 77 | 73 | 75 | 67 | 67 | 52 | 28 |