YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | 66.52 | g | 74.95 | 86.75 | 90.37 | a | 88.39 | 80.18 | 71.24 | 56.66 | a | 51.55 | 75.01 | d | ||||||
1962 | 50.68 | 55.30 | 53.39 | 70.58 | 73.02 | 82.48 | 89.19 | 89.83 | a | 83.83 | a | 72.47 | 63.03 | 55.63 | 69.95 | |||||||||||
1963 | 47.77 | 59.36 | 58.76 | 63.85 | 77.90 | 80.70 | 91.21 | 85.89 | 84.58 | k | 74.43 | b | 60.40 | 52.10 | 68.40 | a | ||||||||||
1964 | 47.92 | 48.91 | 55.44 | 65.10 | 73.32 | 82.55 | 91.05 | 85.61 | 80.92 | 74.95 | 55.08 | 51.76 | 67.72 | |||||||||||||
1965 | 52.18 | 51.71 | 54.68 | 63.83 | 71.40 | 77.93 | 89.31 | 87.34 | 79.15 | 73.15 | 62.62 | 52.84 | 68.01 | |||||||||||||
1966 | 47.87 | 49.16 | 60.37 | 68.47 | 78.15 | 84.08 | 90.44 | 88.55 | 82.43 | 69.68 | 60.50 | 52.55 | 69.35 | |||||||||||||
1967 | 49.79 | 54.95 | 61.02 | 60.48 | 72.95 | 80.32 | 89.50 | 89.29 | 83.08 | 72.56 | 63.37 | 48.08 | 68.78 | |||||||||||||
1968 | 51.69 | 59.05 | 59.11 | 64.95 | 74.40 | 83.92 | 87.56 | 83.85 | 82.25 | 70.98 | 58.35 | 47.47 | 68.63 | |||||||||||||
1969 | 54.21 | 51.50 | 54.00 | 65.93 | 75.92 | 81.20 | 90.16 | 91.76 | 83.78 | 67.45 | 60.60 | 53.90 | 69.20 | |||||||||||||
1970 | 50.39 | 57.66 | 56.94 | 61.66 | a | 76.90 | 84.70 | 91.03 | 90.27 | 79.65 | 66.19 | 59.12 | 50.02 | 68.71 | ||||||||||||
1971 | 50.26 | 53.36 | 59.84 | 63.67 | 70.89 | 81.63 | 89.98 | 86.45 | 82.45 | 64.92 | 58.26 | a | 52.50 | y | 69.25 | a | ||||||||||
1972 | 51.76 | l | 56.40 | 67.26 | 67.40 | 75.85 | 85.43 | 91.61 | 87.94 | 83.65 | 70.50 | 54.90 | 49.32 | 71.84 | a | |||||||||||
1973 | 48.10 | 53.85 | a | 53.32 | 63.63 | 76.21 | 84.16 | a | 88.79 | 87.66 | 78.78 | 69.13 | ----- | z | 51.83 | j | 70.36 | b | ||||||||
1974 | 50.35 | 52.02 | 60.27 | 65.07 | 75.47 | 87.48 | 87.92 | 85.63 | 82.13 | 71.89 | 57.08 | 46.03 | 68.45 | |||||||||||||
1975 | 48.47 | 50.59 | 55.11 | 58.98 | a | 70.76 | 80.77 | 88.85 | 88.08 | 83.14 | a | 70.24 | 58.67 | 52.89 | 67.21 | |||||||||||
1976 | 51.81 | 56.57 | 57.58 | a | 63.53 | 75.90 | 83.53 | a | 88.73 | 87.11 | 80.03 | 69.02 | b | 60.91 | c | 52.23 | 68.91 | |||||||||
1977 | 50.56 | 56.00 | 55.50 | 68.30 | 70.94 | 86.00 | 90.98 | 89.98 | 83.27 | 75.35 | 65.07 | w | 56.00 | b | 71.17 | a | ||||||||||
1978 | 51.40 | j | 55.36 | ----- | z | 64.95 | 74.95 | 86.05 | 90.37 | 87.30 | c | 83.98 | 75.31 | 58.80 | 49.44 | e | 72.65 | b | ||||||||
1979 | 47.29 | 52.38 | b | 56.47 | 65.45 | a | 71.52 | 84.12 | b | 89.45 | 85.85 | a | 87.03 | a | 72.62 | a | 56.22 | c | 55.10 | 68.63 | ||||||
1980 | 54.45 | 57.54 | a | 57.19 | 65.90 | 71.65 | 84.72 | 91.40 | 86.61 | 83.12 | 71.98 | 60.95 | 59.34 | 70.40 | ||||||||||||
1981 | 56.16 | 57.64 | 59.05 | c | 71.21 | a | 75.13 | 88.65 | 90.37 | a | 90.90 | a | 84.45 | 70.26 | d | 53.40 | y | 54.67 | a | 72.59 | a | |||||
1982 | 50.72 | a | 55.20 | 57.56 | 66.43 | b | 74.53 | 81.90 | 89.10 | a | 89.75 | a | 82.85 | c | 69.28 | a | 57.85 | c | 50.53 | b | 68.81 | |||||
1983 | 53.14 | b | 54.52 | a | 57.07 | d | 61.32 | 74.27 | 81.87 | 89.61 | 86.70 | a | 86.23 | 72.00 | b | 58.23 | 53.22 | d | 69.02 | |||||||
1984 | 53.83 | a | 54.46 | b | 61.55 | b | 65.18 | 80.59 | b | 83.87 | 87.61 | 86.57 | a | 83.82 | 66.50 | a | 56.90 | a | 50.40 | a | 69.27 | |||||
1985 | 50.63 | a | 51.11 | a | 57.25 | a | 68.25 | 76.28 | b | 85.37 | 88.89 | ----- | z | 75.52 | a | 68.47 | 55.17 | f | 50.68 | c | 67.24 | b | ||||
1986 | 55.87 | 53.63 | b | 61.84 | b | 66.40 | a | 74.08 | 84.47 | a | 84.59 | c | 86.98 | b | 75.02 | 66.33 | a | 56.36 | a | 49.89 | 67.96 | |||||
1987 | 48.26 | b | 52.00 | 55.17 | a | 69.53 | 73.05 | 83.32 | 85.78 | a | 85.06 | 78.05 | 71.40 | b | 54.91 | b | 46.48 | e | 66.92 | |||||||
1988 | 48.94 | e | 54.10 | c | 57.89 | 64.15 | 72.35 | 82.83 | 87.33 | b | 84.52 | 77.98 | b | 73.55 | a | 57.27 | b | 51.91 | b | 67.74 | ||||||
1989 | 51.57 | a | 56.44 | c | 64.17 | d | 74.14 | b | 76.71 | b | 83.12 | 89.47 | 85.08 | 81.84 | a | 69.52 | 59.13 | 50.02 | a | 70.10 | ||||||
1990 | 48.28 | a | 50.84 | 62.09 | d | 69.66 | a | 75.06 | 87.68 | 88.32 | a | 84.57 | a | 82.33 | a | 72.88 | c | 59.59 | a | 48.05 | 69.11 | |||||
1991 | 49.75 | a | 58.83 | a | 53.10 | b | 62.34 | a | 70.87 | a | 77.43 | 86.12 | b | 86.84 | 81.52 | 74.20 | a | 58.10 | a | 52.12 | a | 67.60 | ||||
1992 | 51.13 | a | 55.88 | 57.84 | b | 68.47 | 75.47 | a | 81.90 | a | 86.27 | 85.88 | a | 81.41 | a | 71.69 | 54.48 | 48.84 | 68.27 | |||||||
1993 | 54.29 | 54.82 | 60.23 | 66.76 | a | 76.46 | d | 83.53 | 86.97 | 87.34 | 82.12 | 72.87 | a | 57.25 | 52.29 | c | 69.58 | |||||||||
1994 | 52.59 | b | 53.32 | 62.09 | c | 68.58 | 73.36 | c | 86.86 | b | 89.62 | f | 90.90 | a | 82.98 | c | 68.78 | d | 56.79 | k | 52.83 | j | 71.05 | c | ||
1995 | 51.92 | f | 60.50 | j | 59.95 | i | 64.44 | l | 70.93 | p | 82.07 | o | 88.89 | l | 89.38 | k | 85.08 | l | 71.90 | j | 63.54 | q | 55.61 | m | ----- | z |
1996 | 51.80 | k | 59.42 | j | 62.11 | l | 69.61 | h | 78.90 | k | 88.00 | k | 90.22 | k | 89.79 | l | 79.21 | f | 71.00 | 61.75 | 53.89 | 62.21 | i | |||
1997 | 53.27 | 54.93 | 65.02 | 66.05 | 80.90 | 82.42 | 89.05 | 88.66 | b | 86.03 | a | 70.02 | 60.50 | a | 50.67 | a | 70.63 | |||||||||
1998 | 53.44 | 50.95 | 58.57 | d | 60.90 | 70.98 | a | 79.41 | a | 90.24 | 90.92 | 83.84 | b | 70.05 | 59.29 | a | 54.52 | f | 69.87 | a | ||||||
1999 | 55.32 | c | 60.87 | e | 64.58 | a | 62.38 | a | 74.22 | a | 84.04 | d | 88.50 | a | 88.60 | b | 83.03 | a | 74.90 | 64.07 | a | 51.89 | 71.03 | |||
2000 | 54.66 | c | 57.11 | b | 59.86 | b | 70.57 | 79.63 | 87.24 | a | 90.70 | a | 89.53 | a | 86.78 | a | 70.06 | 54.07 | 53.77 | 71.17 | ||||||
2001 | 50.29 | c | 52.06 | d | 60.73 | a | 67.43 | b | 80.86 | b | 84.83 | a | 89.93 | b | 88.73 | a | 84.59 | b | 72.84 | c | 63.65 | d | 50.29 | c | 70.52 | |
2002 | 52.93 | d | 56.83 | d | 59.30 | c | 70.67 | a | 75.64 | b | 86.87 | 90.47 | 88.52 | a | 83.85 | 69.95 | a | 62.11 | h | 52.13 | e | 71.56 | a | |||
2003 | 59.40 | b | 55.76 | c | 59.72 | a | 64.19 | a | 76.16 | c | 84.60 | a | 92.23 | 90.64 | b | 85.71 | b | 78.23 | a | 59.43 | b | 53.31 | b | 71.61 | ||
2004 | 54.82 | c | 51.44 | b | 68.70 | d | 68.80 | c | 77.34 | 84.67 | 88.50 | a | 88.05 | a | 83.19 | c | 71.70 | c | 57.24 | a | 53.41 | d | 70.65 | |||
2005 | 55.13 | e | 56.27 | d | 59.43 | d | 67.66 | b | 76.16 | b | 84.83 | 91.52 | a | 87.30 | a | 83.26 | c | 73.23 | c | 62.67 | a | 54.47 | a | 70.99 | ||
2006 | 54.72 | b | 57.54 | e | 56.96 | d | 66.68 | e | 79.33 | b | 88.98 | 92.48 | b | 88.52 | c | 80.83 | c | 71.12 | f | 62.28 | e | 50.90 | g | 72.83 | b | |
2007 | 49.02 | g | 56.42 | c | 65.35 | e | 68.67 | a | 79.17 | a | 86.82 | 91.90 | b | 91.65 | 85.09 | b | 72.66 | b | 66.45 | b | 49.42 | f | 76.42 | b | ||
2008 | 52.17 | g | 54.08 | c | 61.85 | a | 66.57 | g | ----- | z | 87.09 | a | 90.70 | a | 88.74 | 85.20 | b | 73.94 | d | 64.46 | b | 53.61 | c | 73.30 | c | |
2009 | 55.74 | 55.64 | 60.79 | b | 67.61 | k | 81.74 | l | 84.44 | l | 93.60 | e | 89.31 | m | 86.71 | r | ----- | z | ----- | z | ----- | z | 66.44 | h | ||
2010 | 58.25 | q | 54.83 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.43 | x | ----- | z |
2012 | 54.48 | i | 55.48 | i | 60.37 | l | 69.63 | k | 78.89 | m | 87.10 | j | 89.78 | m | 90.92 | k | 83.28 | l | 73.93 | i | 63.85 | m | 54.03 | n | ----- | z |
2013 | 49.73 | k | 52.58 | i | 63.98 | j | 67.16 | h | 77.26 | n | 86.37 | k | 90.95 | i | 88.29 | j | 83.70 | j | 69.09 | i | 63.88 | n | 52.66 | i | ----- | z |
2014 | 55.14 | i | 58.09 | k | 63.95 | l | 68.48 | i | 76.47 | o | 85.53 | k | 90.30 | i | 86.43 | j | 83.94 | l | 73.09 | n | 59.91 | m | 55.79 | l | ----- | z |
2015 | 56.29 | l | 60.67 | h | 64.90 | j | 67.55 | i | 73.75 | o | 87.43 | h | 89.98 | i | 91.41 | n | 84.76 | k | 73.79 | n | 59.77 | q | 50.64 | m | ----- | z |
2016 | 51.66 | o | 59.05 | j | 64.65 | n | 69.11 | k | 75.47 | m | 88.85 | j | 92.74 | l | 89.10 | j | 81.77 | q | 75.94 | n | 65.23 | o | 56.56 | o | ----- | z |
2017 | 53.82 | i | 60.19 | j | 67.41 | o | 68.56 | m | 77.53 | p | 90.56 | m | 91.71 | l | 88.75 | o | 82.63 | k | 75.32 | n | 66.61 | p | ----- | z | ----- | z |
2018 | 59.11 | q | 57.42 | i | 61.88 | o | 73.17 | l | 78.20 | p | 88.17 | l | 91.12 | s | 89.47 | k | 84.31 | v | 71.06 | n | 59.82 | p | 54.47 | p | ----- | z |
2019 | 52.41 | o | 51.21 | p | 61.82 | q | 70.10 | o | 69.77 | p | 85.36 | l | 91.83 | k | 91.42 | l | 84.28 | n | 70.21 | n | 65.82 | s | 53.75 | q | ----- | z |
2020 | 53.12 | r | 54.12 | q | 61.25 | u | 66.55 | s | 79.57 | q | 86.00 | l | 91.88 | s | 93.88 | o | 84.83 | o | 76.26 | l | 65.41 | m | 53.80 | p | ----- | z |
2021 | 54.75 | q | 57.19 | j | 59.15 | k | 70.39 | k | 78.28 | m | 89.48 | i | 90.97 | k | 88.64 | q | 84.69 | l | 70.21 | n | 66.94 | n | 58.77 | p | ----- | z |
2022 | 53.53 | o | 53.94 | l | 61.05 | u | ----- | z | ----- | z | 88.06 | v | 92.56 | m | 89.10 | j | 84.63 | o | 75.26 | l | 57.08 | q | 51.07 | p | ----- | z |
2023 | 52.73 | t | 51.47 | j | 55.82 | n | 67.47 | j | 79.92 | y | 84.79 | w | 96.56 | w | 92.68 | n | 83.27 | o | 76.62 | r | 64.87 | o | 58.35 | r | ----- | z |
2024 | 52.21 | s | 56.05 | s | 58.57 | p | 66.04 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.87 | 54.66 | 59.20 | 66.09 | 75.15 | 83.98 | 89.52 | 87.87 | 82.45 | 71.31 | 59.30 | 51.77 | 69.19 | |||||||||||||
S.D. | 2.87 | 2.78 | 3.64 | 3.22 | 2.81 | 2.63 | 1.86 | 2.01 | 2.66 | 2.72 | 3.00 | 2.69 | 1.25 | |||||||||||||
SKEW | 0.30 | -0.08 | 0.49 | 0.04 | 0.25 | -0.35 | -0.44 | 0.07 | -0.82 | -0.12 | 0.29 | 0.12 | 0.18 | |||||||||||||
MAX | 59.40 | 60.87 | 68.70 | 74.14 | 80.90 | 88.98 | 93.60 | 91.76 | 87.03 | 78.23 | 66.45 | 59.34 | 71.61 | |||||||||||||
MIN | 47.29 | 48.91 | 53.10 | 58.98 | 70.76 | 77.43 | 84.59 | 83.85 | 75.02 | 64.92 | 54.07 | 46.03 | 66.92 | |||||||||||||
YRS | 42 | 46 | 45 | 44 | 45 | 46 | 46 | 45 | 45 | 46 | 41 | 41 | 31 |