YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 88.27 | a | 88.16 | 84.08 | 73.21 | 54.22 | 49.79 | 72.95 | f | |||||
1949 | 42.26 | 49.86 | 57.24 | 66.77 | 73.29 | 82.22 | 88.50 | 85.27 | 85.05 | a | 67.71 | 64.35 | 51.11 | 67.80 | ||||||||||||
1950 | 48.77 | 56.59 | 59.26 | 68.50 | a | 72.16 | 81.18 | 87.95 | 86.21 | 79.27 | 75.63 | 62.70 | 56.48 | 69.56 | ||||||||||||
1951 | 50.00 | 53.66 | 58.60 | 65.45 | 74.15 | 80.23 | 89.94 | 85.87 | 81.42 | 71.21 | 57.78 | 50.45 | 68.23 | |||||||||||||
1952 | 49.19 | 52.37 | c | 53.20 | a | 65.60 | 76.87 | a | 81.57 | 86.16 | 87.29 | 82.43 | 74.77 | 55.40 | 49.33 | b | 67.85 | |||||||||
1953 | 52.89 | 52.80 | 59.98 | 64.67 | 67.68 | 81.43 | 89.08 | 87.05 | 81.67 | 69.90 | 60.18 | 48.21 | 67.96 | |||||||||||||
1954 | 51.16 | b | 60.07 | 57.87 | 70.17 | 75.26 | 80.55 | 88.71 | b | 85.79 | 83.13 | 72.27 | 61.78 | 51.97 | 69.89 | |||||||||||
1955 | 47.24 | 49.81 | a | 58.50 | 63.85 | 71.77 | 79.75 | 84.90 | 85.97 | 81.02 | 74.42 | 58.22 | 54.74 | 67.52 | ||||||||||||
1956 | 55.02 | a | 49.52 | 60.07 | a | 65.10 | 75.32 | 85.12 | 87.40 | 84.42 | 83.30 | 69.73 | 56.43 | a | 52.25 | a | 68.64 | |||||||||
1957 | 52.65 | a | 59.61 | 60.23 | 64.37 | 70.74 | 83.92 | 89.61 | 86.61 | 80.65 | 69.39 | 54.75 | 53.30 | a | 68.82 | |||||||||||
1958 | 51.10 | a | 56.43 | 55.40 | 65.13 | 78.87 | 83.88 | 88.90 | 88.68 | 83.12 | 73.35 | 59.07 | 55.11 | 69.92 | ||||||||||||
1959 | 52.40 | 51.70 | 59.74 | 69.75 | 71.74 | 85.80 | 90.53 | b | 86.74 | 80.73 | 70.65 | 59.12 | 52.27 | 69.26 | ||||||||||||
1960 | 47.40 | 49.40 | 62.27 | 67.13 | 74.05 | 85.63 | 88.97 | 87.32 | 83.83 | 69.05 | 59.15 | 50.79 | b | 68.75 | ||||||||||||
1961 | 53.77 | a | 54.96 | a | 59.08 | a | 66.88 | 72.65 | 84.62 | 88.65 | 87.00 | 79.32 | 68.68 | 54.56 | d | 50.65 | 68.40 | |||||||||
1962 | 49.62 | a | 54.70 | 54.53 | 70.65 | 71.11 | 80.28 | 88.06 | 89.65 | 83.07 | 71.39 | 62.41 | b | 54.73 | 69.18 | |||||||||||
1963 | 48.21 | 59.18 | 58.63 | 63.25 | 76.66 | 79.14 | a | 89.66 | 86.40 | 84.48 | 74.02 | 60.08 | 51.37 | 69.26 | ||||||||||||
1964 | 47.37 | 49.00 | 55.95 | 64.81 | a | 72.37 | 80.32 | 89.29 | 85.16 | 80.07 | 73.39 | 54.25 | 51.15 | a | 66.93 | |||||||||||
1965 | 52.10 | 51.93 | a | 56.21 | 64.18 | 70.53 | 77.08 | 89.53 | 88.18 | 79.22 | 72.23 | 61.07 | 52.29 | 67.88 | ||||||||||||
1966 | 48.15 | 49.66 | 60.79 | 68.35 | ----- | z | 83.77 | 90.73 | 89.21 | 82.32 | 70.42 | 60.60 | 51.87 | 68.71 | a | |||||||||||
1967 | 49.76 | 55.20 | 61.58 | 61.43 | 73.32 | 79.43 | 89.87 | 88.60 | 82.80 | 72.03 | 62.82 | 47.60 | 68.70 | |||||||||||||
1968 | 51.32 | 58.53 | 59.43 | a | 65.15 | 74.34 | 83.07 | a | 87.44 | 84.40 | a | 80.52 | 70.66 | 58.00 | 48.73 | a | 68.47 | |||||||||
1969 | 54.11 | 52.30 | a | 55.74 | 67.47 | 75.76 | 80.57 | 90.18 | 91.68 | 83.08 | 67.13 | 59.37 | 52.79 | 69.18 | ||||||||||||
1970 | 49.37 | 57.02 | 57.77 | c | 61.95 | 75.55 | 83.65 | 91.40 | 89.16 | 79.25 | 66.05 | 58.65 | 50.23 | 68.34 | ||||||||||||
1971 | 50.16 | 53.62 | 60.23 | 64.23 | 70.95 | 80.95 | 91.06 | 87.48 | 81.77 | 66.21 | 57.19 | a | 48.27 | 67.68 | ||||||||||||
1972 | 48.97 | 56.21 | a | 67.31 | 67.73 | 74.74 | 83.95 | 91.06 | 87.10 | 81.33 | 69.47 | 53.83 | a | 48.85 | a | 69.21 | ||||||||||
1973 | 47.92 | 53.88 | c | 53.98 | 64.35 | 76.52 | 82.87 | 89.87 | 89.19 | 81.03 | 71.03 | 57.52 | 52.05 | 68.35 | ||||||||||||
1974 | 51.18 | 52.88 | 61.26 | 66.42 | 75.76 | 87.16 | a | 88.71 | 87.27 | 82.47 | 72.19 | 58.75 | 47.98 | b | 69.33 | |||||||||||
1975 | 50.24 | 52.39 | 57.05 | 60.42 | 72.24 | 81.38 | 89.76 | 88.50 | 82.45 | 69.85 | 58.20 | 52.37 | 67.90 | |||||||||||||
1976 | 51.85 | 57.79 | 58.42 | 64.34 | a | 76.06 | 84.03 | 89.74 | 86.81 | 80.27 | 67.85 | a | 59.70 | 51.48 | 69.03 | |||||||||||
1977 | 50.50 | 56.62 | 56.48 | 67.93 | 70.19 | 84.67 | 89.71 | 89.00 | 81.55 | 73.06 | 60.53 | 54.74 | 69.58 | |||||||||||||
1978 | 51.77 | 54.36 | 62.42 | 65.45 | 74.56 | 86.27 | 90.61 | 85.53 | 81.80 | 74.08 | 58.25 | 48.52 | 69.47 | |||||||||||||
1979 | 47.06 | 52.98 | 57.84 | 66.72 | 74.32 | 84.17 | 89.52 | 85.88 | a | 85.47 | a | 72.50 | 55.80 | 52.60 | 68.74 | |||||||||||
1980 | 52.94 | 56.40 | 57.24 | 65.55 | 70.93 | a | 82.57 | 89.74 | 86.44 | 81.62 | a | 71.11 | 59.87 | 56.69 | 69.26 | |||||||||||
1981 | 54.58 | 56.11 | 59.15 | 71.22 | 75.42 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.29 | g | |||||
1982 | 53.65 | 59.43 | 61.14 | b | 69.47 | 76.84 | 83.52 | b | 90.16 | 91.50 | 84.87 | 71.21 | 60.59 | a | 53.68 | 71.34 | ||||||||||
1983 | 56.06 | 57.61 | 61.23 | 65.15 | 77.15 | 84.55 | 91.63 | 89.45 | 87.88 | 74.87 | 61.92 | 56.11 | 71.97 | |||||||||||||
1984 | 55.74 | 58.17 | 65.19 | 68.93 | 83.42 | 86.03 | a | 90.21 | 89.97 | 86.47 | 70.07 | a | 61.14 | a | 53.69 | 72.42 | ||||||||||
1985 | 53.97 | a | 56.95 | 62.16 | 73.88 | 80.45 | 89.28 | 92.77 | a | 91.69 | 80.62 | 74.02 | 60.08 | 55.42 | 72.61 | |||||||||||
1986 | 60.84 | 59.61 | a | 67.52 | 72.32 | 79.58 | 89.65 | 89.89 | 92.27 | 81.20 | 72.87 | 63.65 | 55.82 | 73.77 | ||||||||||||
1987 | 54.61 | 58.41 | a | 61.81 | 75.87 | 79.83 | a | 88.87 | 89.87 | a | 89.50 | 83.91 | a | 78.31 | 61.60 | 52.28 | a | 72.91 | ||||||||
1988 | 54.40 | a | 61.38 | a | 64.83 | a | 70.67 | a | 79.54 | c | 88.72 | 92.35 | 90.42 | 84.20 | 80.13 | 64.41 | c | 54.77 | 73.82 | |||||||
1989 | 54.39 | 60.27 | 67.47 | 77.00 | 80.10 | 87.28 | 93.24 | 89.58 | 85.65 | 75.15 | 64.85 | 55.58 | 74.21 | |||||||||||||
1990 | 54.92 | 56.36 | ----- | z | 73.10 | 77.39 | c | 88.95 | 91.10 | 87.35 | 85.30 | 75.56 | 64.78 | 52.89 | 73.43 | a | ||||||||||
1991 | 54.97 | a | 63.95 | 58.20 | a | 68.35 | 75.98 | 83.06 | c | 90.70 | a | 90.68 | 84.72 | 76.68 | a | 61.77 | 56.59 | h | 73.55 | a | ||||||
1992 | 55.25 | a | 60.75 | a | 62.87 | 73.67 | 80.42 | a | 86.45 | 90.25 | a | 87.94 | 85.03 | 74.55 | 57.68 | 51.37 | a | 72.19 | ||||||||
1993 | 56.08 | 56.05 | 63.08 | 69.97 | 79.65 | 83.53 | 87.18 | 87.33 | a | 82.23 | 71.52 | a | 56.28 | 50.89 | 70.32 | |||||||||||
1994 | 51.27 | 53.43 | 61.61 | 67.03 | 75.65 | 89.67 | 92.05 | a | 93.70 | a | 85.81 | a | 71.29 | c | 58.31 | c | 55.27 | a | 71.26 | |||||||
1995 | 54.53 | 63.58 | c | 65.71 | b | 67.57 | b | 74.50 | b | 84.16 | a | 91.28 | b | 92.78 | a | 86.92 | 74.48 | a | 66.85 | 57.03 | a | 73.28 | ||||
1996 | 56.83 | a | 62.16 | 64.66 | 72.74 | a | 80.50 | a | 88.82 | 93.93 | d | 92.45 | b | 83.27 | 73.98 | 65.25 | f | 57.16 | f | 76.93 | b | |||||
1997 | 56.48 | a | 58.94 | a | 69.02 | 70.15 | c | 84.18 | a | 84.68 | b | 91.00 | b | 91.12 | n | 88.45 | h | 73.45 | 65.24 | i | 54.33 | p | 73.49 | d | ||
1998 | 56.35 | g | 54.79 | b | 61.93 | b | 65.92 | 74.60 | 83.02 | 92.57 | a | 92.41 | c | 86.87 | c | 73.67 | a | 62.62 | a | 54.43 | c | 72.98 | a | |||
1999 | 57.00 | a | 60.70 | e | 63.02 | i | 67.62 | n | 77.07 | c | 86.12 | b | 89.73 | a | 91.08 | a | 86.45 | b | 78.66 | b | 68.33 | g | 56.19 | 75.89 | c | |
2000 | 59.02 | e | 61.00 | f | 63.37 | d | 73.83 | g | 83.65 | h | 88.60 | a | 92.45 | 91.24 | 88.30 | 78.09 | o | 56.33 | a | 57.38 | a | 74.59 | d | |||
2001 | 55.96 | c | 57.72 | c | 67.35 | h | 70.29 | b | 83.78 | a | 88.97 | a | 91.71 | b | 91.83 | b | 89.31 | a | 77.96 | g | 66.96 | d | 51.84 | f | 77.39 | c |
2002 | 54.71 | 59.98 | 62.65 | a | 74.02 | 78.65 | a | 89.83 | 92.81 | 91.55 | 86.72 | e | 73.19 | d | 66.78 | j | 54.62 | c | 74.43 | a | ||||||
2003 | 61.80 | a | 58.00 | 62.97 | 68.74 | c | 80.40 | 87.25 | 94.03 | 91.95 | c | 88.07 | b | 80.03 | 60.97 | a | 56.82 | a | 74.25 | |||||||
2004 | 57.35 | a | 55.23 | c | 70.63 | a | 71.86 | a | 80.17 | b | 87.73 | b | 92.61 | 90.48 | 85.55 | 74.14 | b | 60.69 | c | 56.17 | a | 73.55 | ||||
2005 | 58.53 | a | 59.82 | f | 63.35 | a | 70.61 | g | 80.55 | a | 87.55 | 94.29 | 90.55 | b | 90.05 | i | 76.91 | d | 67.83 | f | 57.29 | 76.13 | d | |||
2006 | 57.40 | 59.37 | a | 59.60 | a | 69.32 | k | 80.85 | 90.65 | 94.42 | a | 90.56 | 82.95 | 72.87 | 63.00 | c | 51.12 | c | 72.98 | a | ||||||
2007 | 50.56 | e | 56.89 | e | 64.90 | a | 69.43 | c | 80.07 | d | 86.02 | b | 91.86 | b | 92.46 | c | 86.25 | 75.57 | c | 66.14 | a | 50.75 | a | 72.58 | ||
2008 | 52.77 | 55.59 | a | 62.33 | e | 69.04 | f | 73.43 | b | 87.27 | 91.92 | a | 89.48 | c | 84.72 | a | 73.12 | c | 64.45 | b | 53.50 | d | 71.69 | a | ||
2009 | 56.54 | e | 58.34 | f | 63.81 | d | 67.52 | d | 81.35 | d | 84.02 | d | 92.72 | b | 89.06 | 84.45 | b | 71.19 | b | 63.31 | n | 50.86 | b | 74.15 | b | |
2010 | 55.59 | b | 56.65 | a | 60.31 | b | 66.84 | b | 73.65 | d | 84.00 | f | 91.67 | b | 90.02 | e | 86.06 | d | 74.95 | c | 59.32 | 56.81 | g | 71.50 | b | |
2011 | 52.10 | a | 50.90 | g | 62.89 | c | 69.18 | e | 73.17 | a | 81.93 | c | 89.97 | b | 92.32 | 84.88 | a | 72.86 | c | 58.77 | d | 50.45 | b | 71.68 | a | |
2012 | 54.92 | a | 55.33 | b | 62.02 | e | 70.15 | f | 77.08 | g | 85.31 | c | 88.52 | d | 89.46 | f | 83.56 | c | 73.00 | e | 63.59 | g | 52.72 | h | 71.81 | e |
2013 | 50.05 | b | 52.00 | j | 65.26 | d | 67.70 | e | 77.87 | e | 86.28 | 91.19 | g | 90.00 | f | 84.11 | b | 69.12 | c | 62.98 | b | 52.64 | f | 70.42 | d | |
2014 | 53.61 | l | 59.40 | c | 63.17 | e | 68.02 | g | 75.38 | j | 83.90 | f | 88.60 | e | 84.95 | a | 83.06 | d | 72.50 | a | 65.59 | b | 56.50 | g | 73.90 | e |
2015 | 56.71 | b | 62.88 | c | 69.76 | h | 68.74 | g | 74.90 | f | 87.54 | f | 89.14 | f | 90.59 | c | 84.94 | d | 74.75 | a | 57.38 | a | 49.44 | g | 71.21 | f |
2016 | 52.52 | d | 61.57 | f | 65.57 | i | 68.65 | g | 74.43 | h | 88.56 | d | 91.88 | g | 88.98 | e | 82.82 | k | 77.96 | e | 64.02 | d | 57.79 | g | 74.41 | g |
2017 | 54.05 | c | 60.06 | c | 66.71 | c | 69.67 | f | 76.20 | i | 87.52 | d | 91.17 | d | 89.02 | a | 82.55 | b | 75.63 | e | 66.97 | 57.82 | f | 74.85 | c | |
2018 | 59.34 | f | 58.20 | f | 64.24 | h | 77.19 | n | 77.98 | i | 84.82 | m | 90.88 | k | 89.93 | i | 87.60 | d | 73.80 | h | 59.35 | d | 53.02 | k | 73.47 | j |
2019 | 53.02 | b | 52.10 | c | 62.15 | g | 74.65 | m | 70.95 | i | 84.59 | h | 90.62 | o | 91.58 | f | 85.28 | c | 72.85 | h | 64.29 | f | 55.45 | c | 61.46 | h |
2020 | 55.54 | c | 58.36 | a | 63.40 | b | 71.15 | c | 81.81 | e | 87.07 | b | 93.94 | d | 94.00 | c | 87.10 | d | 77.56 | d | 63.85 | c | 53.89 | c | 73.97 | |
2021 | 54.39 | d | 58.80 | e | 62.61 | h | 73.23 | d | 78.02 | d | 90.09 | b | 90.88 | b | 89.23 | 84.91 | g | 72.64 | i | 68.63 | g | 55.66 | f | 76.38 | e | |
2022 | 53.20 | c | 54.98 | e | 61.15 | g | 69.72 | j | 77.17 | d | 87.23 | b | 90.33 | j | 87.79 | c | 85.21 | i | 72.41 | i | 57.78 | u | 53.63 | d | 69.00 | f |
2023 | 53.20 | k | 54.67 | e | 59.65 | e | 69.98 | g | 77.86 | f | 82.64 | l | 95.98 | j | 93.06 | g | 84.31 | i | 75.09 | n | 63.98 | f | 55.06 | f | 57.16 | j |
2024 | 52.85 | k | 56.61 | b | 60.67 | p | 63.22 | u | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.61 | k |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 52.94 | 56.27 | 61.04 | 67.98 | 76.21 | 84.84 | 90.40 | 88.90 | 83.63 | 72.80 | 60.28 | 52.76 | 70.07 | |||||||||||||
S.D. | 3.53 | 3.58 | 3.68 | 3.56 | 3.71 | 3.20 | 1.95 | 2.41 | 2.46 | 3.07 | 3.37 | 2.66 | 2.16 | |||||||||||||
SKEW | -0.16 | -0.11 | 0.22 | 0.35 | 0.10 | -0.16 | -0.06 | 0.09 | 0.14 | 0.12 | 0.10 | -0.06 | 0.68 | |||||||||||||
MAX | 61.80 | 63.95 | 70.63 | 77.00 | 84.18 | 90.65 | 94.42 | 94.00 | 89.31 | 80.13 | 66.97 | 57.38 | 74.25 | |||||||||||||
MIN | 42.26 | 49.00 | 53.20 | 60.42 | 67.68 | 77.08 | 84.90 | 84.40 | 79.22 | 66.05 | 53.83 | 47.60 | 66.93 | |||||||||||||
YRS | 71 | 69 | 66 | 61 | 65 | 68 | 68 | 69 | 69 | 68 | 64 | 61 | 47 |