YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.81 | 92.45 | 93.67 | 81.39 | 78.77 | 65.45 | 83.92 | f | ||||||
1949 | 55.06 | 62.07 | 65.84 | 75.90 | 77.52 | 86.83 | 90.68 | 93.45 | 93.50 | 82.26 | 85.10 | 70.52 | 78.23 | |||||||||||||
1950 | 64.26 | 68.96 | 71.35 | 76.47 | 75.97 | 84.30 | 93.26 | 91.65 | 87.00 | 90.13 | 81.63 | 77.97 | 80.25 | |||||||||||||
1951 | 67.97 | 68.79 | 77.04 | h | 72.77 | 79.23 | 84.23 | 92.94 | 93.10 | 91.37 | 85.32 | 75.07 | 66.13 | 79.72 | a | |||||||||||
1952 | 62.10 | 69.00 | 63.71 | 70.47 | 83.94 | 80.83 | 95.06 | 95.52 | 96.90 | 88.84 | 72.87 | 68.29 | 78.96 | |||||||||||||
1953 | 72.94 | 73.93 | 71.81 | 71.07 | 77.10 | 83.97 | 95.00 | 92.58 | 92.33 | 87.48 | 79.57 | 74.29 | 81.00 | |||||||||||||
1954 | 67.39 | 77.68 | 67.68 | 73.93 | 78.55 | 83.00 | 94.84 | 89.77 | 94.17 | 85.68 | 81.03 | 71.81 | 80.46 | |||||||||||||
1955 | 63.65 | 69.36 | 73.23 | 76.37 | 75.26 | 83.80 | 89.19 | 95.10 | 95.60 | 82.23 | 75.27 | 68.55 | 78.97 | |||||||||||||
1956 | 69.26 | 64.28 | 76.23 | 71.77 | 79.71 | 89.20 | 91.61 | 90.65 | 97.77 | 80.87 | 82.37 | 75.48 | 80.77 | |||||||||||||
1957 | 63.65 | 70.04 | 69.84 | 72.90 | 73.52 | 89.43 | 94.68 | 94.13 | 90.17 | 76.13 | 70.50 | 72.74 | 78.14 | |||||||||||||
1958 | 71.16 | 69.93 | 65.00 | 75.50 | 82.48 | 85.77 | 91.67 | a | 93.16 | 94.13 | 89.55 | 77.03 | 79.19 | 81.21 | ||||||||||||
1959 | 74.52 | 67.18 | 78.32 | 79.67 | 77.06 | 88.77 | 95.23 | 92.58 | 88.07 | 84.45 | 80.67 | 72.40 | a | 81.58 | ||||||||||||
1960 | 65.55 | 66.38 | 72.71 | 78.90 | 80.55 | 88.97 | 96.71 | 93.10 | 95.07 | 83.13 | 73.53 | 72.03 | 80.55 | |||||||||||||
1961 | 75.81 | 73.89 | 70.87 | 77.87 | 76.29 | 87.47 | 90.61 | 91.71 | 87.67 | 84.81 | 72.90 | 67.52 | 79.78 | |||||||||||||
1962 | 68.52 | 63.64 | 64.03 | 79.10 | 75.68 | 82.73 | 90.90 | 95.39 | 91.43 | 83.19 | 77.00 | 71.26 | 78.57 | |||||||||||||
1963 | 65.58 | 75.96 | 70.70 | a | 70.57 | 77.48 | 79.83 | a | 91.97 | 92.39 | 92.90 | 83.00 | 73.37 | 73.65 | 78.95 | |||||||||||
1964 | 67.19 | 71.93 | 68.61 | 71.93 | 75.97 | 82.57 | 93.87 | 90.48 | 87.80 | 87.81 | 71.87 | 67.10 | 78.09 | |||||||||||||
1965 | 68.16 | 70.39 | 68.61 | 73.40 | 76.35 | 75.43 | 90.03 | 95.45 | 85.30 | 89.65 | 73.40 | 66.71 | 77.74 | |||||||||||||
1966 | 66.81 | 66.29 | 73.23 | 78.03 | 78.39 | 85.27 | 93.13 | 95.10 | 89.60 | 84.74 | 75.47 | 69.55 | 79.63 | |||||||||||||
1967 | 70.10 | 74.07 | 70.61 | 64.73 | 79.74 | 79.27 | 93.52 | 97.29 | 89.27 | 90.06 | 79.73 | 65.10 | 79.46 | |||||||||||||
1968 | 69.58 | 72.59 | 73.71 | 74.97 | 79.13 | 85.67 | 92.32 | 90.84 | 90.73 | 84.03 | 76.80 | 67.77 | 79.84 | |||||||||||||
1969 | 68.10 | 62.32 | 68.74 | 74.37 | 79.65 | 77.20 | 92.10 | 97.81 | 92.37 | 81.84 | 78.53 | 69.94 | 78.58 | |||||||||||||
1970 | 69.10 | 74.21 | 70.68 | 73.10 | 81.35 | 85.37 | 94.39 | 94.97 | 92.07 | 81.77 | 76.97 | 65.19 | 79.93 | |||||||||||||
1971 | 68.55 | 68.71 | 72.84 | 73.00 | 73.16 | 83.90 | 92.81 | 96.39 | 91.63 | 80.94 | 72.57 | 61.16 | 77.97 | |||||||||||||
1972 | 67.74 | 74.17 | 77.29 | 79.27 | 81.48 | 83.13 | 95.65 | 92.29 | 85.73 | 77.48 | 71.57 | 66.58 | 79.37 | |||||||||||||
1973 | 63.42 | 66.82 | 62.45 | 72.37 | ----- | z | 89.07 | 90.94 | 92.03 | 85.67 | 86.00 | 72.77 | 71.81 | 77.58 | a | |||||||||||
1974 | 66.03 | 72.43 | 70.00 | 77.20 | e | 78.46 | e | 89.67 | 89.71 | 87.13 | 88.73 | 79.61 | 76.72 | e | 67.84 | 78.63 | ||||||||||
1975 | 71.26 | 66.00 | 66.00 | 64.73 | 76.13 | 81.87 | 90.65 | 92.35 | 91.50 | 81.90 | 77.13 | 71.03 | 77.55 | |||||||||||||
1976 | 74.10 | 69.24 | 70.10 | 69.55 | a | 79.55 | 89.43 | 88.97 | 91.06 | 80.90 | 84.03 | 80.17 | 74.71 | 79.32 | ||||||||||||
1977 | 67.45 | 76.54 | 68.48 | 77.93 | 72.03 | 85.50 | 94.13 | 91.19 | 88.63 | 84.97 | 81.07 | 72.77 | 80.06 | |||||||||||||
1978 | 66.61 | 67.14 | 69.55 | 70.03 | 81.19 | 92.07 | 94.65 | 92.26 | 88.93 | 87.39 | 71.63 | 65.71 | 78.93 | |||||||||||||
1979 | 62.48 | 66.86 | 67.35 | 75.23 | 78.10 | 91.24 | e | 92.48 | 89.84 | 98.43 | 82.50 | a | 75.57 | 76.19 | 79.69 | |||||||||||
1980 | 67.23 | 73.00 | 68.52 | 75.87 | 70.29 | 87.57 | 95.68 | 92.26 | 87.97 | 86.19 | 79.80 | 76.13 | 80.04 | |||||||||||||
1981 | 72.71 | 74.30 | a | 68.06 | 75.03 | 78.97 | 93.17 | 94.94 | 96.45 | 92.07 | 78.77 | 78.57 | 74.61 | 81.47 | ||||||||||||
1982 | 64.71 | 69.75 | 68.16 | 74.53 | 75.07 | a | 78.47 | 93.50 | a | 94.42 | 90.47 | 85.58 | 72.73 | 67.81 | 77.93 | |||||||||||
1983 | 71.06 | 67.82 | 67.14 | b | 70.20 | 80.19 | 81.73 | 91.40 | a | 94.71 | 94.17 | 83.94 | 73.97 | 67.42 | 78.65 | |||||||||||
1984 | 72.26 | 73.24 | 77.48 | ----- | z | 87.29 | 86.10 | 95.52 | 92.90 | 96.23 | 80.39 | 71.50 | 64.84 | 81.61 | a | |||||||||||
1985 | 66.16 | 68.64 | 67.35 | 79.40 | 80.50 | a | 90.20 | 97.65 | 95.60 | a | 86.17 | 82.45 | 71.37 | 72.32 | 79.82 | |||||||||||
1986 | 75.87 | 70.79 | 72.47 | a | 76.90 | 82.81 | 89.21 | a | 91.42 | 97.10 | 83.43 | 81.23 | 79.10 | 71.68 | 81.00 | |||||||||||
1987 | 68.48 | 69.89 | 70.19 | 81.87 | 80.71 | 87.33 | 87.06 | 91.61 | 91.87 | 86.06 | 74.00 | 64.35 | 79.45 | |||||||||||||
1988 | 70.45 | ----- | z | 78.29 | 77.07 | 82.35 | 84.23 | 93.10 | 91.71 | 89.07 | 85.68 | 74.03 | 69.26 | 81.39 | a | |||||||||||
1989 | 68.10 | 68.11 | 75.90 | a | 83.07 | a | 80.90 | 86.80 | 94.68 | 91.19 | 92.87 | 83.00 | 80.73 | 75.32 | 81.72 | |||||||||||
1990 | 71.37 | a | ----- | z | 72.52 | 75.40 | 79.00 | 89.14 | a | ----- | z | 91.13 | ----- | z | 89.21 | c | 80.71 | b | 69.70 | a | 79.80 | c | ||||
1991 | 70.03 | 78.07 | 65.26 | 75.47 | 80.45 | 83.80 | 89.74 | 92.29 | ----- | z | 90.87 | 81.57 | 70.38 | b | 79.81 | a | ||||||||||
1992 | 72.16 | 73.41 | 69.55 | 82.40 | 83.58 | 89.40 | 94.16 | ----- | z | 97.27 | 87.03 | 79.77 | 68.26 | 81.54 | a | |||||||||||
1993 | 66.29 | 67.64 | 77.00 | 82.57 | ----- | z | 90.27 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.75 | g | |||||
1994 | 75.58 | 68.14 | 73.00 | ----- | z | ----- | z | 92.93 | 93.23 | 98.58 | 94.53 | 82.52 | 71.17 | 70.55 | 82.02 | b | ||||||||||
1995 | 65.12 | g | 74.62 | b | 69.52 | 75.13 | 73.52 | 83.87 | 96.32 | 100.10 | 95.90 | 87.06 | 79.93 | 72.33 | a | 82.57 | a | |||||||||
1996 | 73.47 | a | 69.69 | 74.03 | 84.91 | h | 87.65 | k | 92.00 | h | 97.36 | i | 98.86 | i | 92.64 | h | 85.67 | j | ----- | z | 72.70 | k | 72.40 | i | ||
1997 | 69.90 | k | 73.90 | g | ----- | z | 81.59 | h | ----- | z | ----- | z | 93.55 | i | 99.27 | i | ----- | z | ----- | z | 82.05 | j | ----- | z | ----- | z |
1998 | 69.81 | e | 64.00 | g | 70.12 | g | 73.79 | b | 75.00 | a | ----- | z | 98.68 | i | 103.26 | h | 91.48 | g | 86.36 | i | 78.76 | i | 71.55 | k | 72.86 | i |
1999 | 75.10 | j | 71.65 | h | 72.27 | e | 75.04 | e | 80.67 | j | 89.91 | g | 97.36 | i | 97.61 | h | 92.18 | h | 97.65 | h | ----- | z | 78.48 | j | 73.65 | j |
2000 | 77.60 | k | 74.04 | f | 76.90 | j | 81.50 | h | 89.44 | f | 94.52 | i | 95.80 | f | 101.40 | k | 94.86 | h | 82.74 | h | 77.77 | h | 78.90 | j | ----- | z |
2001 | 69.18 | i | 68.68 | f | 73.48 | j | 73.90 | i | 84.23 | i | 94.36 | h | 94.67 | g | 99.83 | h | 96.33 | i | 90.26 | d | 78.55 | a | 70.48 | 79.76 | i | |
2002 | 72.70 | a | 79.54 | 75.80 | f | 79.04 | f | 83.43 | h | 92.41 | h | 96.10 | j | 97.17 | h | 97.55 | h | 81.90 | j | 83.06 | l | 70.96 | h | 76.12 | j | |
2003 | 81.05 | j | 72.95 | i | 74.52 | f | 76.48 | i | 77.72 | m | ----- | z | 93.29 | x | 100.05 | l | 95.94 | n | ----- | z | 74.60 | o | 73.43 | j | ----- | z |
2004 | 72.50 | m | 68.48 | h | 80.65 | k | 82.29 | i | 87.50 | i | 87.85 | j | 96.00 | j | 94.70 | h | 95.20 | j | 80.50 | i | 72.00 | i | 72.21 | l | ----- | z |
2005 | 69.40 | k | 69.48 | g | 72.95 | j | ----- | z | 86.22 | h | 86.63 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | 71.60 | u | 79.81 | g | ----- | z | ----- | z | 82.59 | i | 94.86 | i | 100.09 | h | 94.90 | j | 94.64 | h | 86.13 | h | 84.26 | k | 74.64 | i | ----- | z |
2007 | 70.05 | k | 72.26 | i | 77.87 | h | 78.09 | h | 84.43 | j | 90.77 | h | ----- | z | 98.27 | i | 91.09 | h | 84.39 | m | 79.00 | i | 66.22 | h | ----- | z |
2008 | 67.95 | j | ----- | z | 77.39 | h | ----- | z | ----- | z | 95.73 | h | 95.48 | j | 96.30 | h | 96.41 | h | 92.24 | j | 85.52 | i | 69.90 | k | ----- | z |
2009 | 72.45 | i | 70.10 | h | 75.17 | h | 78.40 | j | 85.57 | h | 85.45 | h | 98.64 | i | 96.70 | h | 100.65 | j | 88.39 | h | 79.95 | i | 69.43 | j | ----- | z |
2010 | 72.74 | h | 69.40 | h | 72.48 | j | 75.38 | i | 79.27 | i | 87.10 | i | 92.73 | i | 94.50 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | 69.05 | i | 64.65 | h | ----- | z | 74.14 | h | 74.77 | i | 80.00 | i | ----- | z | 89.90 | j | 91.71 | f | 88.61 | h | 73.42 | k | 69.11 | c | 69.11 | k |
2012 | 75.65 | k | 71.03 | 73.96 | c | 77.33 | 84.23 | 89.07 | a | 93.70 | a | 98.90 | 98.80 | 88.47 | a | 79.42 | k | 68.45 | 84.39 | b | ||||||
2013 | 69.68 | 70.29 | 77.68 | 79.43 | 85.57 | c | 89.80 | 87.68 | 96.52 | b | 87.70 | 84.90 | 76.73 | 73.61 | 81.63 | |||||||||||
2014 | 80.77 | 75.14 | 77.74 | 81.47 | 86.90 | 89.83 | 93.74 | 93.97 | 96.07 | 90.42 | 81.43 | 70.71 | 84.85 | |||||||||||||
2015 | 73.23 | 79.08 | b | 82.29 | 81.33 | 76.65 | 90.53 | 90.74 | 95.68 | 94.30 | 88.74 | 78.83 | 71.26 | 83.55 | ||||||||||||
2016 | 69.81 | 82.86 | 77.90 | b | 81.30 | 76.74 | 91.70 | 95.13 | 95.65 | 91.37 | 91.48 | 81.13 | 72.03 | 83.92 | ||||||||||||
2017 | 69.48 | 69.96 | 79.94 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.13 | i | |||
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2020 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2021 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2022 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 68.99 | 70.86 | 71.40 | 75.53 | 78.83 | 86.17 | 92.84 | 93.61 | 91.39 | 84.86 | 76.81 | 70.32 | 79.91 | |||||||||||||
S.D. | 4.23 | 4.38 | 4.49 | 4.17 | 3.66 | 4.12 | 2.34 | 2.64 | 4.01 | 3.63 | 3.71 | 3.71 | 1.66 | |||||||||||||
SKEW | -0.21 | 0.38 | 0.28 | -0.35 | 0.14 | -0.50 | -0.34 | 0.29 | -0.26 | -0.10 | 0.00 | 0.08 | 1.07 | |||||||||||||
MAX | 80.77 | 82.86 | 82.29 | 83.07 | 87.29 | 93.17 | 97.65 | 100.10 | 98.80 | 91.48 | 85.10 | 79.19 | 84.85 | |||||||||||||
MIN | 55.06 | 62.07 | 62.45 | 64.73 | 70.29 | 75.43 | 87.06 | 87.13 | 80.90 | 76.13 | 70.50 | 61.16 | 77.55 | |||||||||||||
YRS | 54 | 53 | 54 | 52 | 50 | 52 | 51 | 51 | 50 | 53 | 52 | 54 | 41 |