YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | 51.26 | 54.55 | 64.26 | 68.82 | 76.34 | 85.87 | 90.15 | 91.35 | 88.10 | 79.42 | 62.50 | 57.63 | 72.52 | |||||||||||||
1956 | 57.53 | 53.22 | 65.02 | 69.92 | 79.48 | a | 89.42 | 92.66 | 92.06 | 92.38 | 74.68 | 61.37 | 55.60 | 73.61 | ||||||||||||
1957 | 54.68 | 64.20 | 65.48 | 70.28 | 74.74 | 89.95 | 95.68 | 91.48 | 87.37 | 72.27 | 59.47 | 57.24 | 73.57 | |||||||||||||
1958 | 56.58 | 61.04 | 60.15 | 70.90 | 84.21 | 88.32 | 93.23 | 93.42 | 88.38 | 79.11 | 62.48 | 59.03 | 74.74 | |||||||||||||
1959 | 57.26 | 56.79 | 66.58 | 75.65 | 76.58 | 90.87 | 95.89 | 91.44 | 84.98 | 75.81 | 64.93 | 55.53 | 74.36 | |||||||||||||
1960 | 50.90 | 56.26 | 67.63 | 72.77 | 78.52 | 91.77 | 94.63 | 93.06 | 88.37 | 75.11 | 62.58 | 53.65 | 73.77 | |||||||||||||
1961 | 57.76 | 61.00 | 63.84 | 72.52 | 77.13 | 89.83 | 92.68 | 91.73 | 83.65 | 73.40 | 59.82 | 54.05 | 73.12 | |||||||||||||
1962 | 55.52 | 58.62 | 59.60 | 76.07 | 75.31 | 85.82 | 92.61 | 94.66 | 87.93 | 75.48 | 66.28 | 57.84 | 73.81 | |||||||||||||
1963 | 51.10 | a | 65.61 | 62.81 | 67.30 | 80.50 | 83.70 | 93.76 | 91.77 | 89.33 | 77.84 | 64.05 | a | 55.00 | 73.56 | |||||||||||
1964 | ----- | z | 54.62 | 60.69 | 68.78 | 77.03 | 84.80 | 94.08 | a | 91.39 | 85.25 | 79.87 | 58.87 | 55.55 | 73.72 | a | ||||||||||
1965 | 56.42 | 58.71 | 61.47 | 70.48 | 76.65 | 80.82 | 92.50 | 92.47 | 83.33 | 78.45 | 64.86 | a | 54.08 | a | 72.52 | |||||||||||
1966 | 51.68 | 54.93 | 65.56 | 73.57 | 81.82 | 87.40 | 93.56 | 93.29 | 87.32 | 74.58 | 64.60 | 55.95 | 73.69 | |||||||||||||
1967 | 53.63 | 60.29 | 65.39 | 63.35 | 77.82 | 83.58 | 94.52 | 94.11 | 85.30 | 77.15 | 67.22 | 52.15 | 72.87 | |||||||||||||
1968 | 55.18 | 64.67 | 65.60 | 70.27 | 78.84 | 87.62 | 91.76 | 89.23 | 86.45 | 75.26 | 63.82 | 50.79 | 73.29 | |||||||||||||
1969 | 58.66 | 56.62 | 62.47 | 71.45 | 80.68 | 83.48 | 93.13 | 96.39 | 89.63 | 71.90 | 64.23 | 55.98 | 73.72 | |||||||||||||
1970 | 54.35 | 61.41 | 62.48 | 66.10 | 80.29 | e | 87.27 | 95.06 | 94.13 | 85.27 | 72.42 | 63.53 | 54.19 | 73.04 | ||||||||||||
1971 | 54.40 | 59.12 | 65.68 | 68.32 | 73.92 | 85.35 | 93.77 | 91.71 | 86.53 | 70.02 | 60.60 | 51.35 | a | 71.73 | ||||||||||||
1972 | 52.05 | 60.78 | 71.58 | 71.95 | 79.11 | 87.62 | 94.98 | 89.94 | 85.35 | 72.02 | 59.18 | 52.60 | a | 73.10 | ||||||||||||
1973 | 52.19 | 58.55 | 59.08 | 69.10 | 81.02 | a | 87.88 | 92.69 | 91.76 | 84.33 | 75.39 | 61.64 | a | 56.37 | 72.50 | |||||||||||
1974 | 54.56 | 57.88 | 65.39 | 71.37 | 78.97 | 90.92 | 91.77 | 91.50 | 88.17 | 76.40 | 62.88 | 52.03 | 73.49 | |||||||||||||
1975 | 54.22 | a | 57.12 | 61.53 | a | 63.77 | 76.32 | 85.65 | 92.95 | 92.53 | 87.48 | 73.16 | 62.95 | 55.40 | 71.92 | |||||||||||
1976 | 56.21 | 61.00 | 62.85 | 68.03 | 79.97 | 87.03 | 91.10 | 90.31 | 82.67 | 74.24 | 63.77 | 54.44 | 72.63 | |||||||||||||
1977 | 54.77 | 61.25 | 59.95 | 71.65 | 72.45 | 89.22 | 94.21 | 92.32 | 86.08 | 78.82 | 65.88 | 59.98 | 73.88 | |||||||||||||
1978 | 56.03 | 60.86 | 68.35 | 69.97 | 79.35 | 92.12 | 95.56 | 92.55 | 85.83 | 79.63 | 62.15 | ----- | z | 76.58 | a | |||||||||||
1979 | 51.02 | a | 57.73 | 63.11 | 71.68 | 77.76 | 88.67 | ----- | z | 89.13 | ----- | z | ----- | z | 60.82 | 58.06 | 68.66 | c | ||||||||
1980 | 59.02 | 63.16 | 63.16 | 70.41 | a | 74.19 | 88.10 | 95.31 | 91.87 | 86.58 | 76.23 | 64.55 | 60.69 | 74.44 | ||||||||||||
1981 | 60.02 | a | 62.09 | 64.35 | 73.73 | 77.94 | 91.83 | 94.34 | 94.98 | 88.25 | 71.85 | 65.57 | 58.72 | a | 75.31 | |||||||||||
1982 | 54.35 | d | 61.24 | a | 61.32 | a | 71.00 | 77.03 | 83.55 | 91.53 | 92.50 | b | 85.10 | a | 72.92 | 61.48 | b | 54.34 | 72.20 | |||||||
1983 | 57.73 | 59.11 | 64.34 | 65.93 | 79.03 | a | 85.05 | 93.44 | 90.13 | a | 89.30 | 76.58 | 63.80 | 58.02 | 73.54 | |||||||||||
1984 | 58.60 | 59.53 | 66.28 | a | 69.70 | 84.42 | 86.75 | 91.02 | 91.37 | 89.12 | 71.81 | 61.50 | 54.24 | 73.69 | ||||||||||||
1985 | 55.00 | a | 56.96 | 62.84 | 75.30 | 80.47 | 90.25 | 94.97 | 93.77 | 80.17 | 74.34 | 59.90 | 55.47 | 73.29 | ||||||||||||
1986 | 60.29 | 61.93 | 69.23 | 72.32 | 79.61 | 90.22 | 91.81 | b | 94.24 | 81.45 | 72.90 | 63.95 | 55.53 | 74.46 | ||||||||||||
1987 | 54.39 | 59.80 | 62.82 | 75.73 | 79.37 | 89.13 | 90.66 | 91.93 | a | 85.97 | 78.92 | 63.30 | 52.39 | 73.70 | ||||||||||||
1988 | 54.50 | 62.05 | 66.19 | 71.27 | 78.69 | 87.78 | 93.65 | 92.33 | b | 86.43 | 81.68 | 63.95 | 55.52 | 74.50 | ||||||||||||
1989 | 54.55 | c | 60.52 | a | 69.79 | 78.93 | 80.31 | 88.85 | 95.48 | 91.82 | a | 88.23 | 76.63 | 65.77 | 56.44 | 75.61 | ||||||||||
1990 | 54.89 | 56.88 | 67.30 | a | 74.20 | 78.42 | 90.13 | 93.97 | 91.50 | 87.78 | 77.82 | a | 64.85 | 52.00 | a | 74.14 | ||||||||||
1991 | 56.18 | 65.20 | 60.73 | a | 71.38 | a | 76.48 | 85.13 | 92.15 | a | 94.05 | 88.12 | 79.95 | a | 64.10 | 56.58 | 74.17 | |||||||||
1992 | 56.85 | a | 63.57 | 64.82 | a | 76.13 | 82.45 | 87.75 | 92.27 | 93.63 | 89.93 | a | 78.32 | 60.92 | 52.50 | 74.93 | ||||||||||
1993 | 56.98 | 60.38 | 67.66 | 74.27 | 81.56 | 88.30 | 91.31 | 92.40 | 88.40 | 78.27 | a | 62.17 | a | 55.69 | 74.78 | |||||||||||
1994 | 57.40 | 58.12 | 68.15 | 73.42 | 78.65 | 92.38 | 94.65 | 96.05 | 89.43 | 74.87 | 58.08 | 54.65 | 74.65 | |||||||||||||
1995 | 57.08 | a | 65.96 | 66.79 | 70.62 | 75.94 | 86.52 | a | 94.69 | 97.53 | 92.35 | 78.27 | 69.70 | 58.89 | 76.20 | |||||||||||
1996 | 58.40 | 64.62 | 67.10 | a | 75.67 | 82.79 | 90.52 | 96.71 | 95.13 | 86.43 | 76.84 | 64.42 | 56.35 | 76.25 | ||||||||||||
1997 | 58.85 | 59.59 | 70.45 | 72.10 | 86.26 | 85.80 | 92.31 | 95.50 | a | 89.91 | a | 74.73 | 65.10 | 53.44 | 75.34 | |||||||||||
1998 | 56.74 | 57.20 | 63.34 | 67.78 | 75.10 | 83.83 | 95.55 | 96.11 | 88.52 | 74.34 | 62.93 | ----- | z | 74.68 | a | |||||||||||
1999 | 57.58 | 60.57 | 64.15 | 66.47 | 78.39 | 86.57 | 92.27 | 93.37 | 89.53 | 79.42 | 67.03 | 56.95 | a | 74.36 | ||||||||||||
2000 | 59.48 | 61.40 | 65.58 | 75.85 | 83.60 | a | 90.30 | 93.97 | 93.73 | 88.92 | 74.02 | a | 57.92 | 58.00 | 75.23 | |||||||||||
2001 | 54.42 | 57.31 | a | 66.81 | 70.91 | b | 85.39 | 90.12 | 92.95 | 93.56 | 90.83 | 78.84 | 67.50 | 53.26 | 75.16 | |||||||||||
2002 | 55.42 | 60.36 | 63.53 | 73.62 | 79.35 | 90.37 | 94.95 | 92.90 | 89.32 | 74.31 | 66.15 | 54.26 | 74.54 | |||||||||||||
2003 | 62.75 | a | 59.55 | 66.31 | 68.70 | 80.73 | 87.95 | 95.73 | a | 94.07 | a | 90.58 | 82.85 | 61.17 | a | 55.61 | 75.50 | |||||||||
2004 | 56.94 | 57.48 | 74.23 | 73.90 | a | 82.06 | 88.10 | 94.23 | 93.47 | 86.77 | 73.85 | a | 59.92 | 55.29 | 74.69 | |||||||||||
2005 | 57.56 | 59.27 | 64.60 | 70.85 | 80.84 | 87.70 | 95.81 | 93.84 | 87.60 | 76.73 | 66.02 | 55.81 | 74.72 | |||||||||||||
2006 | 56.85 | 61.29 | 61.79 | 70.84 | a | 82.83 | a | 92.73 | 97.18 | 93.65 | 86.73 | 74.61 | 66.18 | 54.69 | 74.95 | |||||||||||
2007 | 52.98 | 60.48 | 68.81 | 72.63 | 81.11 | 88.88 | 94.27 | 95.95 | 87.65 | 76.12 | a | 68.03 | 52.84 | 74.98 | ||||||||||||
2008 | ----- | z | 60.33 | 66.95 | 73.12 | 77.73 | 91.33 | 94.53 | 93.31 | 90.95 | ----- | z | ----- | z | ----- | z | 81.03 | d | ||||||||
2009 | ----- | z | ----- | z | ----- | z | ----- | z | 85.10 | ----- | z | ----- | z | ----- | z | ----- | z | 72.87 | 64.90 | a | ----- | z | 74.29 | i | ||
2010 | 57.26 | 59.55 | 63.47 | 67.97 | 76.15 | 87.10 | 94.77 | 93.92 | 89.60 | 75.73 | 62.72 | 57.97 | 73.85 | |||||||||||||
2011 | 56.10 | 55.02 | 66.87 | 72.50 | 75.53 | 87.80 | 95.10 | 97.84 | 90.70 | 78.74 | 62.57 | 52.48 | 74.27 | |||||||||||||
2012 | 58.31 | 60.31 | 65.11 | 73.87 | 83.10 | 90.47 | 93.02 | 95.37 | 90.63 | 78.47 | 67.23 | 56.90 | 76.07 | |||||||||||||
2013 | 53.68 | 58.00 | 70.40 | 74.78 | 82.24 | 92.17 | 95.45 | 93.60 | 88.20 | 73.39 | 65.40 | 55.90 | 75.27 | |||||||||||||
2014 | 60.82 | 65.07 | 69.65 | 74.53 | 82.13 | 91.03 | 96.15 | 92.10 | 90.73 | 80.82 | 66.05 | 58.34 | 77.29 | |||||||||||||
2015 | 59.06 | 67.25 | 73.00 | 73.92 | 76.69 | 91.37 | 93.23 | 97.66 | 91.47 | 81.55 | 62.60 | 54.65 | 76.87 | |||||||||||||
2016 | 56.45 | 66.10 | 70.16 | 74.22 | 78.77 | 93.15 | 96.87 | 95.34 | 85.93 | 79.63 | 66.65 | 57.21 | 76.71 | |||||||||||||
2017 | 56.00 | 62.50 | 70.40 | 75.22 | 79.84 | 90.82 | 96.68 | 96.02 | 85.45 | 78.27 | 69.18 | 58.45 | 76.57 | |||||||||||||
2018 | 61.10 | 59.09 | 66.18 | 75.80 | 80.34 | 89.42 | 96.50 | 95.76 | 91.47 | 74.61 | 63.53 | 54.97 | 75.73 | |||||||||||||
2019 | 55.56 | 54.45 | 65.73 | 75.15 | 75.02 | 87.72 | 94.29 | 95.94 | 87.83 | 74.15 | 65.05 | 55.03 | 73.83 | |||||||||||||
2020 | 56.81 | 59.40 | 63.16 | 72.85 | 83.76 | 88.32 | 95.74 | 97.85 | 90.47 | 79.69 | 65.00 | 55.23 | 75.69 | |||||||||||||
2021 | 55.98 | 60.82 | 63.08 | 75.03 | 80.13 | 92.77 | 96.63 | 93.84 | 90.25 | 73.98 | 69.78 | 57.65 | 75.83 | |||||||||||||
2022 | 57.48 | 58.98 | 66.71 | 74.22 | 80.87 | 91.80 | 95.37 | 93.89 | 90.63 | 77.24 | 59.48 | 54.39 | 75.09 | |||||||||||||
2023 | 54.32 | 55.71 | 62.26 | 72.62 | 79.13 | 84.37 | 98.06 | 95.31 | 86.87 | 77.85 | 65.38 | 57.26 | 74.10 | |||||||||||||
2024 | 55.06 | 59.97 | 63.33 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.45 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 56.09 | 59.93 | 65.30 | 71.82 | 79.34 | 88.37 | 94.07 | 93.42 | 87.76 | 76.23 | 63.71 | 55.52 | 74.35 | |||||||||||||
S.D. | 2.52 | 3.07 | 3.24 | 3.12 | 2.97 | 2.72 | 1.75 | 2.02 | 2.53 | 2.84 | 2.72 | 2.17 | 1.25 | |||||||||||||
SKEW | 0.03 | 0.19 | 0.43 | -0.49 | 0.10 | -0.38 | -0.10 | 0.23 | -0.56 | 0.12 | -0.03 | 0.04 | 0.16 | |||||||||||||
MAX | 62.75 | 67.25 | 74.23 | 78.93 | 86.26 | 93.15 | 98.06 | 97.85 | 92.38 | 82.85 | 69.78 | 60.69 | 77.29 | |||||||||||||
MIN | 50.90 | 53.22 | 59.08 | 63.35 | 72.45 | 80.82 | 90.15 | 89.13 | 80.17 | 70.02 | 57.92 | 50.79 | 71.73 | |||||||||||||
YRS | 67 | 69 | 69 | 68 | 69 | 68 | 67 | 68 | 67 | 67 | 68 | 65 | 63 |