YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 94.55 | 82.40 | 75.23 | 71.33 | 66.45 | 77.99 | g | |||||
1940 | 59.19 | 59.14 | 67.65 | 68.83 | 82.61 | 91.07 | 93.55 | 93.74 | 84.97 | ----- | z | ----- | z | 62.00 | 76.27 | b | ||||||||||
1941 | 55.00 | 58.89 | 62.81 | 63.40 | 78.26 | 81.63 | 93.68 | 87.00 | 83.33 | 71.48 | 69.53 | 57.16 | 71.85 | |||||||||||||
1942 | 59.81 | 58.07 | 64.58 | 64.63 | 76.39 | 86.33 | 97.87 | 92.71 | 87.40 | 77.68 | 70.27 | 62.55 | 74.86 | |||||||||||||
1943 | 59.00 | 62.36 | 63.16 | 70.00 | 79.48 | 82.80 | 93.52 | 92.39 | 92.33 | 78.26 | 70.47 | 55.71 | 74.96 | |||||||||||||
1944 | 56.94 | 53.86 | 62.29 | 66.03 | 74.42 | 77.07 | 90.52 | 95.74 | 88.47 | 80.61 | 60.00 | 61.00 | 72.25 | |||||||||||||
1945 | 59.32 | 58.21 | 57.39 | 68.90 | 74.84 | 81.93 | 96.42 | 92.19 | 87.67 | 77.03 | 66.72 | a | 58.35 | 73.25 | ||||||||||||
1946 | 60.42 | 60.79 | 62.61 | 73.47 | 73.16 | 89.37 | 93.90 | 94.52 | 90.87 | 72.23 | 60.30 | 61.48 | 74.43 | |||||||||||||
1947 | 58.84 | 65.54 | 64.03 | 71.53 | 78.90 | 83.57 | 96.87 | 89.90 | 91.67 | 77.10 | 64.40 | 57.48 | 74.99 | |||||||||||||
1948 | 65.16 | 58.48 | 58.61 | 68.33 | 75.74 | 83.40 | 93.68 | 94.39 | 90.50 | 76.90 | 66.40 | 55.10 | 73.89 | |||||||||||||
1949 | 43.45 | 53.96 | 59.68 | 73.63 | 74.13 | 87.83 | 93.87 | 92.81 | 93.17 | 76.03 | 76.53 | 57.94 | 73.59 | |||||||||||||
1950 | 53.26 | 64.96 | 65.97 | 73.20 | 75.10 | 85.57 | 93.13 | 95.61 | 85.07 | 84.52 | 72.80 | 68.74 | 76.49 | |||||||||||||
1951 | 57.94 | 59.29 | 65.58 | 67.87 | 77.48 | 83.73 | 94.58 | 92.87 | 93.27 | 77.32 | 65.00 | 54.00 | 74.08 | |||||||||||||
1952 | 52.45 | 58.66 | 55.35 | 66.70 | 82.19 | 81.37 | 94.84 | 96.03 | 90.60 | 86.32 | 60.53 | 55.77 | 73.40 | |||||||||||||
1953 | 63.42 | 61.93 | 64.19 | 65.83 | 70.74 | 83.57 | 96.84 | 95.76 | f | 92.17 | 79.39 | 70.43 | 62.45 | 73.72 | a | |||||||||||
1954 | 58.32 | 68.89 | 59.81 | 73.50 | 78.55 | 85.17 | 95.90 | 89.42 | 91.20 | 81.13 | 71.70 | 59.35 | 76.08 | |||||||||||||
1955 | 52.26 | 57.39 | 65.94 | 69.83 | 72.68 | 83.17 | 90.19 | 95.06 | 91.20 | 81.97 | 67.27 | 59.84 | 73.90 | |||||||||||||
1956 | 62.03 | 56.62 | 69.84 | 67.40 | 75.13 | 88.77 | 92.65 | 91.23 | 95.80 | 76.26 | 72.10 | 65.61 | 76.12 | |||||||||||||
1957 | 53.19 | 65.32 | 64.29 | 68.59 | a | 69.94 | 89.17 | 97.06 | 94.03 | 89.40 | 70.71 | 61.47 | 62.74 | 73.83 | ||||||||||||
1958 | 61.61 | 61.18 | 56.29 | 68.17 | 81.00 | 86.63 | 92.81 | 95.81 | 90.87 | 84.13 | 69.13 | 70.55 | 76.51 | |||||||||||||
1959 | 64.26 | 57.93 | 71.13 | 76.93 | 73.90 | 90.30 | 98.52 | 92.74 | 84.20 | 81.26 | 71.50 | 61.32 | 77.00 | |||||||||||||
1960 | 54.74 | 57.69 | 68.87 | 74.30 | 78.19 | 92.13 | 97.97 | 95.45 | 93.23 | 79.13 | 65.97 | 61.30 | a | 76.58 | ||||||||||||
1961 | 65.23 | 65.96 | 64.35 | 75.00 | 74.10 | 91.77 | 96.65 | 94.39 | 86.34 | a | 79.16 | 64.83 | 59.55 | 76.44 | ||||||||||||
1962 | 60.35 | 56.00 | 58.23 | 76.70 | 73.68 | 85.34 | a | 95.03 | 99.50 | c | 93.97 | a | 81.93 | a | 72.73 | 66.73 | a | 76.68 | ||||||||
1963 | 58.94 | 71.11 | 65.65 | 67.07 | 77.68 | 82.03 | 95.90 | 94.48 | 92.03 | 79.39 | 67.23 | 64.55 | 76.34 | |||||||||||||
1964 | 59.40 | a | 64.93 | a | 63.73 | a | 69.07 | a | 76.43 | a | 86.30 | c | 97.97 | 95.13 | 90.48 | e | 76.92 | s | 62.97 | a | 59.33 | a | 75.07 | a | ||
1965 | 62.16 | 64.96 | 61.97 | 68.83 | 75.73 | a | 79.33 | ----- | z | 95.16 | 83.90 | 86.39 | 66.41 | a | 57.63 | a | 72.95 | a | ||||||||
1966 | 59.21 | b | 59.73 | b | 69.39 | 77.68 | b | 80.07 | c | 89.24 | a | 95.61 | 97.00 | a | 87.50 | t | 80.48 | 68.10 | a | 59.86 | b | 76.03 | a | |||
1967 | 61.90 | a | 67.74 | a | 66.27 | a | 60.38 | a | 72.72 | m | 81.87 | 97.37 | a | 99.20 | a | 87.10 | a | 87.07 | b | 72.60 | 57.79 | b | 76.30 | a | ||
1968 | 61.40 | a | 67.31 | c | 68.55 | 72.14 | a | 78.68 | 88.33 | 94.68 | 91.32 | 91.30 | 80.74 | 70.37 | 61.27 | i | 78.62 | a | ||||||||
1969 | 60.90 | 55.64 | 64.71 | 67.85 | j | 81.20 | a | 79.23 | 94.06 | 99.84 | 94.13 | 76.52 | 69.50 | 63.16 | 76.26 | a | ||||||||||
1970 | 60.71 | 66.86 | 67.13 | a | 70.10 | 81.19 | 88.07 | 97.42 | 97.06 | 90.67 | 78.55 | 69.11 | l | 58.10 | 77.81 | a | ||||||||||
1971 | 62.83 | a | 65.04 | 69.48 | 69.80 | 72.95 | j | 92.59 | m | 96.39 | 96.77 | 91.27 | 76.45 | 68.07 | 54.58 | 75.07 | b | |||||||||
1972 | 62.90 | a | 69.07 | 79.45 | 76.55 | a | 80.80 | a | 87.90 | 97.19 | 92.90 | 86.14 | a | 70.90 | u | 64.53 | 58.48 | 77.81 | a | |||||||
1973 | 56.74 | 59.64 | 56.94 | 69.12 | f | 84.41 | i | 89.57 | 94.03 | 93.48 | 86.17 | 81.90 | a | 63.45 | h | 63.87 | 75.82 | c | ||||||||
1974 | 57.32 | 65.36 | 64.97 | 73.93 | a | 78.33 | s | 90.63 | 92.40 | a | 92.87 | 92.27 | 76.97 | a | 69.00 | 59.29 | 75.91 | a | ||||||||
1975 | 63.20 | a | 61.79 | 62.00 | a | 62.10 | 75.67 | v | 85.37 | 95.45 | 95.19 | 90.66 | a | 78.13 | 70.00 | 62.90 | 75.16 | a | ||||||||
1976 | 65.23 | a | 63.03 | 65.10 | a | 75.94 | m | 81.43 | a | 90.10 | 93.26 | 92.03 | 80.80 | 78.40 | a | 71.90 | 63.74 | 76.82 | a | |||||||
1977 | 60.23 | a | 70.39 | 63.10 | 76.12 | m | 70.06 | 88.47 | 97.48 | 93.10 | 89.95 | k | 83.50 | a | 74.76 | a | 65.13 | 76.62 | b | |||||||
1978 | 57.83 | a | 61.19 | a | 64.90 | 66.19 | i | 82.42 | e | 91.86 | a | 97.90 | 94.81 | 83.14 | h | ----- | z | 66.20 | 57.32 | 74.94 | c | |||||
1979 | 51.58 | 60.59 | a | 65.03 | 73.37 | 80.29 | 92.97 | 98.10 | 93.42 | 97.20 | 80.13 | 68.07 | ----- | z | 78.25 | a | ||||||||||
1980 | 59.35 | 65.28 | 63.90 | a | 73.79 | a | 71.23 | 88.57 | 99.48 | 93.94 | ----- | z | 84.48 | 74.03 | a | 69.13 | a | 76.65 | a | |||||||
1981 | 65.47 | a | 68.57 | 63.52 | 76.10 | 79.84 | 97.23 | 97.97 | 99.94 | 92.13 | 74.71 | 72.27 | 66.81 | 79.55 | ||||||||||||
1982 | 58.13 | 63.57 | 61.45 | 70.00 | 76.94 | 80.33 | 95.61 | 96.23 | 87.57 | 79.23 | 63.93 | 59.13 | 74.34 | |||||||||||||
1983 | 62.68 | 62.54 | b | 61.80 | a | 65.27 | 80.70 | a | 84.45 | a | 96.32 | 94.10 | a | 92.69 | a | 79.06 | 67.13 | 60.58 | 75.61 | |||||||
1984 | 65.41 | b | 67.56 | b | 72.42 | 74.23 | 89.71 | 87.90 | 95.19 | 95.90 | 93.33 | 76.53 | a | 65.23 | 56.23 | 78.30 | ||||||||||
1985 | 59.00 | 64.50 | 65.94 | 78.97 | 81.87 | a | 94.93 | 99.26 | 97.84 | 83.69 | a | 80.00 | 63.66 | a | 64.60 | a | 77.85 | |||||||||
1986 | 68.17 | a | 64.21 | 69.53 | a | 74.61 | b | 83.61 | 93.87 | 94.35 | 100.21 | c | 81.73 | 77.20 | a | 71.17 | a | 62.59 | b | 78.44 | ||||||
1987 | 60.65 | 63.22 | a | 64.48 | 80.40 | 80.77 | 91.40 | 91.00 | 94.58 | 90.74 | c | 80.42 | 66.40 | 56.43 | a | 76.71 | ||||||||||
1988 | 61.74 | 70.03 | 74.17 | a | 73.93 | 83.00 | 89.21 | a | 98.23 | 95.39 | 91.57 | 88.13 | 69.29 | b | 61.67 | a | 79.70 | |||||||||
1989 | 60.61 | 62.92 | b | 73.03 | 81.57 | 81.10 | a | 90.50 | 99.32 | 93.47 | a | 92.40 | 81.45 | 73.90 | 69.26 | 79.96 | ||||||||||
1990 | 63.67 | a | 63.33 | a | 70.86 | b | 74.28 | a | 79.42 | 93.50 | 97.81 | 94.55 | 91.20 | 86.50 | a | 73.37 | 60.19 | 79.06 | ||||||||
1991 | 64.19 | 75.07 | 60.94 | 74.10 | a | 77.80 | a | 86.48 | a | 93.84 | 94.56 | m | 94.10 | 86.03 | 75.14 | a | 63.03 | b | 77.34 | a | ||||||
1992 | 64.35 | 65.10 | 63.55 | 78.63 | 83.32 | 87.03 | 93.16 | 97.80 | a | 94.37 | 83.26 | 69.87 | 57.36 | c | 78.15 | |||||||||||
1993 | 56.79 | b | 58.96 | 72.55 | 78.10 | 82.97 | a | 89.13 | 88.94 | 94.65 | 93.14 | a | 82.70 | a | 69.69 | a | 64.87 | a | 77.71 | |||||||
1994 | 69.16 | 61.32 | 70.81 | 73.31 | a | 77.10 | 95.10 | a | 96.10 | a | 98.03 | 92.48 | e | 78.28 | b | 64.07 | 62.68 | 78.20 | ||||||||
1995 | 56.87 | a | 71.37 | a | 66.84 | 71.23 | 71.16 | 86.17 | 97.13 | a | 99.71 | 94.52 | a | 86.21 | b | 80.50 | 68.39 | 79.17 | ||||||||
1996 | 66.39 | 66.79 | a | 71.23 | 80.40 | 82.74 | 91.90 | 100.03 | b | 99.93 | a | 91.11 | b | 82.48 | 71.83 | 64.32 | 80.76 | |||||||||
1997 | 59.90 | a | 67.21 | 78.55 | 76.41 | a | 89.61 | 85.80 | 94.28 | b | 98.29 | 93.23 | 80.06 | 71.43 | 61.84 | 79.72 | ||||||||||
1998 | 64.55 | 57.75 | 66.52 | 69.83 | 69.17 | b | 81.47 | 97.42 | 101.16 | 86.57 | 78.77 | a | 71.43 | 63.94 | 75.71 | |||||||||||
1999 | 67.61 | 65.82 | 68.00 | 66.97 | 78.26 | 88.45 | a | 93.90 | 95.65 | 92.03 | 88.61 | 76.93 | 68.23 | 79.21 | ||||||||||||
2000 | 67.55 | 63.59 | 69.77 | 78.93 | 87.23 | 93.67 | 96.26 | 97.42 | 94.17 | 78.52 | 69.40 | 71.16 | 80.64 | |||||||||||||
2001 | 61.55 | 60.89 | 70.90 | 70.77 | 88.74 | 96.00 | 94.45 | 99.00 | ----- | z | ----- | z | ----- | z | ----- | z | 80.29 | d | ||||||||
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.15 | q | 60.17 | m | ----- | z |
2004 | 61.24 | j | 58.16 | j | 76.56 | f | 72.38 | d | 78.56 | d | 84.12 | f | 92.93 | c | 90.72 | b | 86.11 | c | 74.74 | h | 61.21 | a | 61.23 | e | 77.59 | e |
2005 | 59.53 | n | ----- | z | ----- | z | 70.33 | x | 73.13 | p | 81.62 | n | 95.25 | w | 97.17 | m | 82.09 | s | 77.50 | o | 73.08 | r | 64.17 | g | ----- | z |
2006 | 63.11 | l | 67.82 | f | 59.64 | i | 68.75 | j | 84.17 | g | 98.25 | j | 99.27 | i | 97.14 | j | 91.17 | g | 74.42 | l | 74.48 | i | 62.27 | i | ----- | z |
2007 | 58.48 | h | 62.80 | h | 73.25 | g | 75.07 | p | 78.36 | i | 91.18 | h | 97.92 | g | 97.85 | e | 86.28 | l | 79.60 | f | 75.35 | j | 58.09 | i | 97.85 | k |
2008 | 56.13 | h | 63.28 | 70.42 | 76.37 | 76.48 | 94.40 | 98.10 | 98.16 | 94.70 | 85.68 | 75.90 | a | 57.84 | 81.03 | a | ||||||||||
2009 | 66.52 | 60.00 | 68.32 | 71.66 | a | 85.94 | 79.57 | 97.16 | 94.55 | 92.57 | 74.74 | 70.63 | 56.29 | 76.49 | ||||||||||||
2010 | 59.55 | 60.29 | 65.65 | 66.80 | 74.77 | 86.13 | 92.39 | 94.00 | c | ----- | z | ----- | z | ----- | z | ----- | z | 74.95 | d | |||||||
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 60.45 | 62.90 | 65.79 | 71.85 | 78.50 | 87.44 | 95.48 | 95.14 | 90.17 | 80.06 | 69.02 | 61.54 | 76.49 | |||||||||||||
S.D. | 4.56 | 4.50 | 4.88 | 4.75 | 4.76 | 4.61 | 2.42 | 2.85 | 3.79 | 4.06 | 4.38 | 4.20 | 2.36 | |||||||||||||
SKEW | -0.81 | 0.22 | 0.31 | -0.10 | 0.23 | -0.06 | -0.39 | -0.07 | -0.71 | 0.12 | -0.04 | 0.37 | 0.01 | |||||||||||||
MAX | 69.16 | 75.07 | 79.45 | 81.57 | 89.71 | 97.23 | 100.03 | 101.16 | 97.20 | 88.61 | 80.50 | 71.16 | 80.76 | |||||||||||||
MIN | 43.45 | 53.86 | 55.35 | 60.38 | 69.17 | 77.07 | 88.94 | 87.00 | 80.80 | 70.71 | 60.00 | 54.00 | 71.85 | |||||||||||||
YRS | 64 | 65 | 65 | 61 | 61 | 64 | 65 | 66 | 61 | 60 | 62 | 63 | 42 |