YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 78.71 | w | 70.81 | 57.89 | b | 54.77 | 61.16 | i | ||
1940 | 47.61 | 53.21 | a | 63.29 | 68.80 | 80.40 | a | 87.23 | 91.43 | c | 86.57 | a | 83.27 | 73.20 | a | 58.14 | h | 52.79 | b | 71.62 | a | |||||
1941 | 47.65 | 54.86 | 57.10 | a | 63.63 | c | 76.65 | 83.65 | d | 88.62 | g | 86.93 | b | 79.56 | e | 69.32 | f | 60.04 | e | 53.46 | g | 67.78 | c | |||
1942 | 52.48 | 51.20 | c | 57.67 | g | 68.22 | c | 80.60 | f | 90.48 | c | 91.14 | c | 85.77 | e | 79.00 | e | 71.19 | e | 64.75 | b | 55.16 | f | 72.69 | c | |
1943 | 52.43 | c | 59.60 | h | 63.23 | e | 76.50 | b | 83.63 | d | 88.52 | c | 89.13 | a | 92.05 | i | 81.71 | f | 73.22 | d | 60.85 | c | 47.34 | b | 70.54 | c |
1944 | 47.23 | 55.24 | 60.57 | a | 68.23 | 78.90 | 88.17 | 90.29 | 88.39 | 81.03 | 73.50 | a | 56.20 | 50.94 | 69.89 | |||||||||||
1945 | 51.52 | 58.86 | 60.84 | 70.83 | 82.26 | 88.97 | 91.03 | 89.55 | 84.93 | a | 72.68 | 62.70 | 49.13 | a | 71.94 | |||||||||||
1946 | 48.00 | b | 58.00 | 63.55 | 77.43 | 79.58 | l | 93.20 | 90.54 | c | 89.19 | j | 85.44 | e | 71.56 | d | 57.78 | g | 58.28 | f | 73.46 | d | ||||
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 92.57 | x | 88.56 | d | 86.56 | c | 76.12 | f | 52.78 | g | 49.00 | b | 74.70 | i |
1948 | 47.12 | g | 51.60 | d | 57.41 | d | 75.38 | d | 82.03 | 87.08 | r | 93.78 | m | 90.52 | f | 84.93 | 72.46 | c | 56.96 | d | 52.52 | f | 68.68 | e | ||
1949 | 41.52 | 52.39 | 64.42 | e | 72.56 | e | 80.93 | c | 88.83 | 90.61 | c | 90.18 | c | 82.90 | 68.74 | 65.96 | b | 51.43 | c | 70.87 | ||||||
1950 | 54.57 | a | 60.45 | f | 64.93 | c | 75.32 | h | 80.88 | e | 92.04 | b | 87.44 | f | 88.85 | e | 80.46 | d | 80.72 | b | 65.54 | d | 58.57 | a | 74.06 | c |
1951 | 52.58 | e | 55.54 | 60.48 | f | 68.77 | 81.13 | 92.12 | f | 94.77 | e | 89.72 | b | 85.87 | g | 74.18 | c | 56.85 | c | 51.41 | b | 69.44 | c | |||
1952 | 55.21 | b | 54.48 | d | 57.48 | h | 68.80 | 79.54 | c | 91.57 | 91.72 | b | 91.71 | c | 84.50 | b | 76.77 | 57.31 | d | 48.77 | a | 72.76 | a | |||
1953 | 56.84 | 52.14 | 62.61 | c | 69.65 | d | 76.57 | c | 91.70 | c | 92.38 | e | 89.77 | a | 86.33 | 73.13 | 61.41 | a | 47.14 | c | 71.64 | |||||
1954 | 53.52 | b | 62.11 | a | 61.19 | e | 76.44 | c | 80.23 | 90.24 | a | 93.42 | 87.20 | a | 84.40 | 73.38 | e | 63.64 | b | 53.10 | 73.24 | |||||
1955 | 47.24 | b | 51.89 | 63.07 | a | 71.48 | a | 77.47 | a | 87.15 | c | 87.06 | 88.03 | b | 86.96 | b | 76.45 | b | 60.93 | a | 55.23 | a | 71.08 | |||
1956 | 56.00 | b | 51.22 | b | 67.50 | c | 70.39 | b | 84.80 | a | 93.21 | a | 91.82 | c | 89.07 | a | 88.03 | 74.73 | a | 57.52 | a | 52.48 | d | 73.06 | ||
1957 | 53.27 | a | 62.46 | b | 61.08 | e | 69.60 | 75.63 | a | 89.83 | a | 92.06 | 86.39 | 83.93 | b | 66.21 | b | 53.93 | 53.68 | 70.67 | ||||||
1958 | 47.80 | a | 58.04 | 53.67 | a | 68.17 | 82.52 | b | 92.52 | a | 93.94 | 91.87 | a | 79.56 | c | 68.23 | 60.97 | a | 57.37 | a | 71.22 | |||||
1959 | 53.70 | a | 54.61 | 62.36 | c | 72.72 | a | 80.38 | b | 91.20 | 91.60 | a | 87.70 | a | 85.18 | b | 73.55 | 58.57 | b | 51.30 | a | 71.91 | ||||
1960 | 45.84 | 49.45 | 66.45 | 73.53 | 79.26 | 91.30 | 89.03 | a | 91.61 | 85.17 | a | 70.42 | 61.38 | a | 44.67 | a | 70.68 | |||||||||
1961 | 47.58 | 56.63 | a | 62.65 | 72.17 | 83.07 | a | 91.20 | 91.58 | 87.90 | 79.87 | 72.90 | 54.93 | 49.94 | 70.87 | |||||||||||
1962 | 47.71 | 59.79 | 57.77 | a | 75.45 | a | 81.39 | 88.27 | d | 87.29 | 92.47 | a | 82.40 | 72.37 | a | 63.14 | a | 53.03 | 71.76 | |||||||
1963 | 48.84 | 59.56 | c | 64.57 | a | 73.62 | a | 84.23 | a | 89.33 | 93.68 | 86.32 | 84.97 | a | 77.06 | 61.30 | c | 52.17 | a | 72.97 | ||||||
1964 | 48.03 | a | 47.00 | a | 59.83 | b | 69.37 | c | 81.58 | 89.53 | 92.77 | a | 89.88 | e | 81.10 | 75.87 | a | 60.23 | 50.48 | 70.47 | ||||||
1965 | 54.29 | 54.29 | 58.50 | a | 71.10 | a | 79.07 | c | 86.80 | 91.81 | 88.61 | 79.47 | 73.63 | a | 64.03 | 51.58 | 71.10 | |||||||||
1966 | 45.23 | 48.21 | 65.10 | 72.80 | 82.59 | b | 87.48 | a | 93.16 | 87.83 | a | 82.90 | a | 72.73 | a | 64.40 | 51.65 | 71.17 | ||||||||
1967 | 53.48 | 57.81 | a | 69.58 | 74.41 | a | 79.86 | b | 86.79 | b | 91.65 | 85.68 | 80.46 | b | 75.57 | a | 62.57 | 45.45 | 71.94 | |||||||
1968 | 50.32 | 56.52 | 60.70 | a | 67.53 | 80.07 | b | 91.41 | a | 88.55 | b | 85.74 | 82.62 | a | 74.90 | 56.75 | b | 49.23 | 70.36 | |||||||
1969 | 56.14 | b | 55.89 | a | 59.18 | c | 73.33 | 80.87 | 90.10 | a | 91.26 | 91.42 | 82.42 | d | 69.67 | a | 58.54 | b | 52.94 | 71.81 | ||||||
1970 | 51.68 | c | 58.52 | c | 58.74 | 70.53 | 81.65 | 89.45 | a | 91.76 | b | 89.48 | 82.60 | 62.58 | 61.93 | 54.34 | b | 71.11 | ||||||||
1971 | 54.54 | c | 55.96 | 66.35 | 70.41 | a | 80.07 | a | 90.66 | a | 92.58 | 85.19 | 81.69 | a | 69.42 | 57.57 | 48.35 | 71.07 | ||||||||
1972 | 53.61 | 59.59 | 70.57 | c | 75.23 | 80.10 | 87.30 | 91.65 | 86.32 | 79.33 | 70.97 | 53.07 | 50.48 | 71.52 | ||||||||||||
1973 | 47.48 | 50.36 | 58.08 | e | 64.70 | 77.50 | a | 87.43 | 88.50 | a | 88.77 | 83.37 | 75.32 | 65.34 | a | 52.97 | a | 69.99 | ||||||||
1974 | 51.94 | 56.46 | 69.77 | a | 72.57 | 84.87 | 94.00 | 89.52 | 84.23 | a | 79.04 | d | 67.57 | c | 58.70 | c | 46.90 | 71.30 | ||||||||
1975 | 47.39 | 54.43 | 61.32 | 67.63 | 76.97 | 89.03 | 87.48 | b | 89.40 | a | 78.87 | 74.17 | a | 60.22 | c | 50.05 | i | 71.54 | a | |||||||
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 87.50 | m | 81.10 | 71.07 | b | 55.30 | c | 43.39 | m | 69.16 | i | |
1983 | 49.00 | b | 53.67 | a | 61.81 | e | 63.76 | e | 78.29 | g | 87.82 | b | 90.80 | f | 89.84 | f | 84.90 | a | 71.00 | b | 61.62 | f | 52.81 | d | 65.60 | d |
1984 | 50.46 | c | ----- | z | 61.43 | c | 70.59 | a | 84.72 | b | 87.56 | c | 88.71 | c | 84.37 | d | 81.27 | d | 63.93 | c | 57.56 | c | 48.15 | d | 70.79 | a |
1985 | 45.16 | 51.39 | 62.76 | b | 69.36 | e | 78.69 | b | 88.52 | c | 91.75 | g | 88.50 | a | 78.96 | d | 69.19 | e | 58.57 | 55.67 | j | 69.11 | b | |||
1986 | 56.17 | b | 58.70 | a | 64.59 | i | 71.59 | c | 77.14 | i | 86.00 | a | 85.86 | b | 89.21 | g | 80.13 | 68.20 | a | 55.00 | c | 47.19 | j | 70.21 | d | |
1987 | 46.48 | b | 51.81 | g | 59.77 | a | 65.91 | h | 76.73 | e | 88.44 | e | 91.57 | j | 86.18 | i | 81.00 | e | 75.93 | d | 57.96 | d | 43.26 | h | 69.47 | e |
1988 | 47.38 | b | 55.52 | f | 65.50 | g | 72.84 | e | 79.46 | g | 87.33 | f | 89.35 | h | 80.75 | c | 77.42 | f | 75.24 | b | 60.36 | b | 48.08 | g | 67.31 | g |
1989 | 50.46 | c | 56.35 | e | 68.42 | e | 78.63 | k | 83.46 | c | 90.38 | i | 89.11 | c | 85.00 | b | 79.81 | d | 69.42 | 58.90 | a | 48.54 | c | 68.95 | b | |
1990 | 46.48 | b | 52.45 | f | 61.27 | e | 69.93 | b | 76.71 | c | 93.50 | b | 84.96 | d | 84.38 | g | 78.89 | b | 72.04 | c | 57.85 | c | 47.44 | d | 68.91 | b |
1991 | 46.50 | a | 56.81 | b | 57.54 | g | 70.79 | a | 78.67 | a | 86.08 | d | 82.67 | g | 84.64 | i | 77.17 | a | 71.50 | i | 55.10 | a | 46.73 | e | 64.73 | d |
1992 | 44.14 | b | 54.28 | d | 63.79 | c | 72.81 | c | 75.04 | c | 85.70 | g | 89.19 | e | 87.62 | b | 84.00 | b | 74.97 | b | 53.58 | d | 46.03 | 67.77 | a | |
1993 | 50.89 | d | 55.33 | d | 63.52 | b | 73.36 | b | 78.88 | e | 88.92 | d | 90.60 | p | 84.68 | l | 81.12 | e | 70.07 | a | 58.22 | c | 51.00 | i | 68.92 | c |
1994 | 52.19 | 55.28 | c | 65.37 | d | 72.19 | c | 81.17 | h | 95.15 | d | 93.10 | a | 92.23 | e | 83.96 | e | 71.00 | e | 58.67 | 53.71 | 72.08 | a | |||
1995 | 50.50 | a | 61.46 | 65.10 | b | 68.93 | 79.62 | g | 87.41 | c | 91.32 | 89.32 | 84.00 | c | 75.97 | 64.80 | 54.45 | 72.12 | a | |||||||
1996 | 53.19 | 60.93 | b | 64.11 | d | 73.30 | c | 88.55 | 90.78 | c | 89.26 | h | 85.77 | e | 78.57 | b | 71.14 | b | 61.30 | g | 53.10 | a | 71.94 | b | ||
1997 | 48.28 | b | 54.60 | c | 68.31 | e | 68.16 | e | 81.67 | a | 88.46 | b | 90.30 | a | 88.15 | d | 83.07 | b | 71.64 | c | 57.58 | d | 47.91 | i | 72.75 | a |
1998 | 52.10 | 53.39 | 61.21 | c | 67.25 | b | 81.32 | 92.20 | e | 87.59 | d | 88.81 | e | 87.80 | 71.96 | c | 63.68 | e | 53.46 | c | 71.73 | |||||
1999 | 55.64 | c | 61.83 | d | 66.52 | d | 70.10 | a | ----- | z | 87.90 | a | 87.36 | c | 86.43 | c | 82.44 | c | 75.89 | c | 66.90 | a | 49.31 | e | 71.85 | a |
2000 | 56.55 | b | 62.10 | 64.03 | b | 76.39 | b | 88.42 | e | 88.17 | g | 92.38 | b | 88.70 | h | 86.60 | e | 69.52 | h | 51.69 | d | 50.72 | f | 72.27 | d | |
2001 | 46.40 | a | 55.83 | d | 60.14 | b | 73.44 | c | 84.00 | f | 91.36 | h | 91.61 | 87.29 | 86.19 | c | 74.48 | 59.30 | c | 50.59 | d | 68.53 | b | |||
2002 | 51.94 | 55.00 | 64.50 | a | 79.25 | b | 82.86 | c | 94.22 | c | 89.83 | a | 90.17 | h | 81.41 | a | 70.00 | c | 57.73 | d | 47.45 | i | 72.67 | b | ||
2003 | 56.32 | c | 54.18 | 62.67 | a | 72.79 | b | 84.21 | c | 89.14 | b | 96.26 | 91.43 | a | 84.41 | a | 76.34 | b | 61.12 | f | 54.95 | i | 76.78 | b | ||
2004 | 52.17 | b | 52.48 | d | 65.94 | 69.10 | 83.19 | d | 89.70 | c | 91.60 | a | 85.97 | 80.56 | e | 68.52 | d | 56.36 | h | 50.35 | 71.78 | a | ||||
2005 | 54.97 | a | 52.88 | b | 59.25 | g | 71.48 | c | 81.27 | e | 90.20 | e | 93.87 | 85.50 | a | 84.35 | j | 70.39 | 62.30 | 55.19 | 71.81 | b | ||||
2006 | 55.38 | e | 60.22 | a | 63.24 | f | 75.78 | c | 85.25 | c | 92.13 | 89.75 | c | 82.74 | h | 75.38 | a | 70.23 | a | 62.17 | 48.80 | a | 71.51 | b | ||
2007 | 45.81 | 58.19 | a | 65.57 | a | 71.18 | b | 77.42 | 89.63 | 91.13 | a | 90.77 | 83.29 | b | 75.76 | b | 63.93 | a | 49.93 | a | 71.88 | |||||
2008 | 48.06 | 57.33 | b | 65.53 | a | 72.67 | c | 81.76 | b | 92.48 | a | 87.20 | a | 86.82 | c | 80.28 | a | 72.29 | c | 61.00 | b | 52.39 | 71.48 | |||
2009 | 55.30 | a | 60.42 | b | 65.45 | b | 70.83 | 83.07 | b | 85.83 | a | 92.87 | a | 91.00 | m | 82.62 | d | 71.14 | b | 60.97 | 45.87 | a | 70.40 | a | ||
2010 | 47.87 | 50.32 | 60.87 | 71.07 | 79.90 | a | 92.40 | 89.55 | b | 89.53 | a | 86.96 | c | 74.50 | c | 58.47 | 58.55 | 71.67 | ||||||||
2011 | 50.97 | a | 53.58 | b | 69.29 | 75.82 | b | 81.19 | 93.83 | 92.35 | 92.26 | 83.07 | 72.70 | a | 58.20 | 42.03 | a | 72.11 | ||||||||
2012 | 54.35 | 54.64 | a | 66.86 | b | 76.30 | 81.73 | a | 94.10 | 89.81 | 91.06 | 82.86 | a | ----- | z | ----- | z | 51.61 | 74.33 | b | ||||||
2013 | 47.23 | 52.43 | ----- | z | 73.17 | 81.29 | 94.43 | 88.29 | c | 86.88 | o | 80.63 | 69.74 | 56.27 | 49.13 | 69.26 | b | |||||||||
2014 | 53.35 | 58.93 | 64.65 | 71.67 | 79.52 | 93.23 | 91.81 | 84.97 | 80.28 | a | 73.97 | 58.40 | 52.58 | 71.95 | ||||||||||||
2015 | 48.16 | 58.96 | a | 66.24 | b | 70.47 | k | 76.61 | 91.57 | 88.84 | 91.97 | 85.53 | 72.26 | 59.13 | 49.35 | 71.69 | a | |||||||||
2016 | 48.87 | 59.97 | 67.90 | 69.83 | 75.68 | 92.54 | b | 94.43 | j | 86.71 | 83.43 | 77.77 | 59.77 | 53.29 | 70.52 | a | ||||||||||
2017 | 50.71 | 60.61 | 71.03 | 73.57 | 79.42 | 93.31 | a | 91.29 | 87.16 | 83.37 | 71.97 | 68.00 | 55.58 | 73.83 | ||||||||||||
2018 | 54.48 | 58.36 | 65.52 | 75.41 | a | 85.74 | 94.04 | e | 90.00 | 89.97 | 84.37 | 67.87 | 58.33 | 48.87 | 72.75 | |||||||||||
2019 | 49.58 | 54.04 | 65.24 | f | 73.62 | n | 77.13 | ----- | z | 92.94 | 93.00 | b | 83.68 | e | 70.71 | 58.10 | 49.84 | 69.89 | c | |||||||
2020 | 51.35 | 54.07 | 64.26 | 72.90 | 85.90 | 91.87 | 94.06 | 94.48 | 83.11 | b | 76.03 | 63.90 | 50.90 | 73.57 | ||||||||||||
2021 | 50.90 | 55.21 | 63.68 | 72.70 | 82.29 | 91.50 | 89.03 | 87.43 | c | 84.77 | h | 74.74 | 66.27 | 59.38 | b | 72.10 | a | |||||||||
2022 | 53.45 | 55.50 | 64.77 | 76.25 | b | 87.07 | c | 88.93 | 92.42 | 87.70 | d | 84.23 | 68.23 | 56.53 | 52.87 | 72.33 | ||||||||||
2023 | 50.10 | 53.43 | 61.29 | 73.87 | 82.45 | 91.04 | c | 97.61 | 91.74 | 86.76 | a | 76.35 | 62.63 | 53.57 | c | 73.40 | ||||||||||
2024 | 49.81 | 59.74 | b | 63.48 | 73.60 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.66 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 50.69 | 55.79 | 63.48 | 71.75 | 80.97 | 90.20 | 90.88 | 88.41 | 82.61 | 72.36 | 59.85 | 51.14 | 71.68 | |||||||||||||
S.D. | 3.51 | 3.53 | 3.48 | 3.13 | 3.06 | 2.54 | 2.38 | 2.58 | 2.68 | 3.21 | 3.54 | 3.40 | 0.98 | |||||||||||||
SKEW | -0.11 | -0.07 | -0.12 | -0.23 | 0.26 | -0.09 | 0.02 | -0.07 | -0.13 | -0.37 | 0.15 | 0.04 | 0.41 | |||||||||||||
MAX | 56.84 | 62.46 | 71.03 | 79.25 | 88.55 | 95.15 | 97.61 | 94.48 | 88.03 | 80.72 | 68.00 | 59.38 | 73.83 | |||||||||||||
MIN | 41.52 | 47.00 | 53.67 | 63.63 | 75.04 | 83.65 | 84.96 | 80.75 | 75.38 | 62.58 | 51.69 | 42.03 | 69.89 | |||||||||||||
YRS | 76 | 71 | 67 | 72 | 67 | 68 | 65 | 63 | 73 | 74 | 71 | 64 | 36 |