YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 89.00 | 90.34 | 88.87 | a | 83.53 | a | 69.46 | g | 54.70 | 47.95 | 75.73 | f | ||||
1936 | 47.61 | 51.59 | 60.12 | a | 73.06 | c | 79.53 | a | 88.53 | 90.72 | a | 88.54 | d | 79.88 | a | 70.17 | a | 55.09 | a | 46.93 | a | 69.31 | ||||
1937 | 35.24 | 47.75 | 56.55 | 67.17 | d | 79.95 | a | 86.33 | 91.13 | a | 91.03 | 83.72 | 70.84 | 59.45 | a | 51.06 | 68.35 | |||||||||
1938 | 47.87 | 50.36 | 56.06 | 68.18 | 74.16 | 86.30 | 90.29 | 88.81 | 83.10 | 68.52 | 51.02 | a | 47.30 | a | 67.66 | |||||||||||
1939 | 46.06 | 43.46 | 59.52 | 69.97 | 78.40 | 87.60 | 93.00 | a | 91.37 | 79.66 | a | 68.20 | a | 56.66 | a | 49.09 | b | 68.58 | ||||||||
1940 | 46.87 | a | 51.54 | d | 62.12 | c | 68.57 | c | 80.20 | a | 89.79 | b | 93.28 | a | 90.71 | b | 78.64 | a | 69.26 | b | 53.84 | b | 46.57 | b | 69.28 | |
1941 | 48.16 | b | 54.20 | 59.20 | a | 60.95 | 75.27 | 82.02 | b | 90.82 | 86.98 | a | 80.75 | b | 65.52 | a | 61.18 | p | 47.05 | b | 68.27 | a | ||||
1942 | 48.03 | a | 51.14 | f | 55.29 | 68.00 | a | 75.36 | b | 87.50 | a | 92.47 | a | 88.65 | d | 82.48 | b | 70.25 | c | 62.16 | k | 50.97 | b | 71.90 | b | |
1943 | 48.58 | 54.38 | 61.38 | a | 72.00 | 80.55 | 85.98 | 93.28 | a | 88.24 | 85.33 | 71.03 | 55.93 | 48.29 | 70.42 | |||||||||||
1944 | 46.31 | 50.62 | 57.35 | 65.24 | a | 76.60 | a | 84.62 | a | 91.98 | ----- | z | 86.88 | 75.69 | 57.08 | 49.08 | 67.41 | a | ||||||||
1945 | 48.85 | 55.38 | 55.73 | 65.98 | a | 78.50 | 85.31 | a | 91.33 | a | 87.56 | 85.14 | a | 71.38 | e | ----- | z | 43.69 | 69.90 | a | ||||||
1946 | 44.89 | 49.57 | 60.32 | 70.26 | a | 77.03 | b | 89.16 | a | 89.65 | 86.98 | c | ----- | z | 65.85 | 52.72 | 48.79 | 66.84 | a | |||||||
1947 | 44.89 | 54.93 | a | 63.72 | a | 69.00 | a | 79.93 | a | 85.91 | a | 91.42 | 86.21 | 86.17 | 71.65 | a | 52.83 | 45.50 | a | 69.35 | ||||||
1948 | 45.21 | 48.72 | 52.77 | 69.50 | 79.15 | 85.84 | a | 91.48 | 87.89 | 85.12 | 70.73 | 53.93 | 48.69 | 68.25 | ||||||||||||
1949 | 39.58 | 47.40 | c | ----- | z | 76.61 | p | 75.68 | 84.00 | 92.83 | a | 90.19 | g | 83.98 | c | 66.89 | 58.28 | 45.71 | 66.04 | c | ||||||
1950 | 46.31 | 50.31 | l | 61.39 | 71.57 | 77.14 | c | 86.48 | g | 88.84 | 89.83 | j | 82.42 | 77.37 | 60.85 | 53.77 | 68.85 | c | ||||||||
1951 | 48.92 | 51.55 | 58.08 | 67.33 | 76.17 | a | 83.98 | h | 94.08 | 87.58 | 83.70 | 69.94 | 54.38 | 44.69 | 66.95 | a | ||||||||||
1952 | 44.92 | 50.10 | 53.48 | 66.60 | 77.52 | 84.95 | 89.74 | 88.39 | 81.98 | f | 73.40 | 52.38 | 44.85 | 66.03 | a | |||||||||||
1953 | 49.53 | 51.09 | 59.65 | 67.13 | 70.73 | 86.03 | 90.32 | 86.53 | 82.80 | 71.15 | 58.23 | 44.05 | 68.10 | |||||||||||||
1954 | 45.86 | f | 55.82 | 56.39 | 73.15 | 80.45 | 85.48 | 92.09 | b | 88.27 | 82.40 | e | 71.52 | 58.96 | b | 45.00 | d | 71.78 | a | |||||||
1955 | 42.71 | b | 45.23 | b | 58.60 | 67.48 | b | 74.69 | d | 82.23 | 89.81 | 89.09 | b | 84.54 | b | 76.23 | 56.30 | c | 51.15 | d | 68.17 | |||||
1956 | 51.22 | a | 50.30 | a | 60.95 | a | 68.26 | a | 79.67 | a | 89.37 | 90.00 | g | 89.16 | c | 87.91 | m | 71.85 | d | 52.45 | a | 45.39 | m | 68.14 | c | |
1957 | 47.78 | a | 57.61 | a | 60.66 | 66.17 | 70.14 | b | 87.05 | 89.54 | c | 84.15 | d | 83.28 | 68.17 | a | 51.98 | b | 47.21 | c | 67.81 | |||||
1958 | 46.79 | c | 54.83 | d | 54.35 | h | 66.70 | j | 79.76 | d | 87.95 | a | 92.66 | f | 87.20 | c | 77.92 | d | 67.52 | j | ----- | z | ----- | z | 72.41 | f |
1959 | ----- | z | 50.56 | d | ----- | z | 72.61 | u | 75.66 | c | 87.44 | c | 93.63 | 86.15 | d | 81.98 | f | 71.52 | e | ----- | z | 48.31 | j | 77.49 | f | |
1960 | 42.65 | a | 49.31 | h | 63.54 | d | 71.60 | i | 79.40 | g | 91.33 | l | 93.62 | r | 91.81 | r | 81.21 | i | 73.21 | x | ----- | z | 45.25 | a | 50.48 | i |
1961 | 47.00 | 55.79 | 59.00 | 68.33 | 78.15 | 91.52 | 93.68 | a | 88.26 | 80.03 | 70.98 | 56.20 | 42.27 | 69.27 | ||||||||||||
1962 | 46.27 | 50.07 | a | 56.16 | 75.02 | ----- | z | ----- | z | ----- | z | ----- | z | 77.50 | x | ----- | z | 55.45 | s | 49.74 | b | 55.45 | g | |||
1963 | 44.45 | 59.70 | 55.66 | l | 65.15 | m | 81.60 | 85.10 | 94.84 | 86.52 | 83.42 | 74.95 | 57.53 | 43.71 | 71.18 | b | ||||||||||
1964 | 42.50 | 45.47 | ----- | z | 67.67 | a | ----- | z | 86.48 | ----- | z | 89.31 | ----- | z | ----- | z | ----- | z | ----- | z | 66.29 | g | ||||
1965 | ----- | z | ----- | z | 55.98 | 63.58 | 72.68 | 80.23 | b | 89.63 | a | 90.40 | a | 79.77 | 74.98 | ----- | z | ----- | z | 75.91 | d | |||||
1966 | ----- | z | 48.61 | 63.03 | 71.90 | 81.77 | 88.22 | 91.70 | a | 92.19 | 85.52 | 72.23 | 61.45 | 49.94 | 73.32 | a | ||||||||||
1967 | 47.44 | 56.52 | 64.32 | 64.68 | 77.08 | 84.05 | 92.23 | 91.28 | d | 86.05 | 79.32 | a | 64.20 | 40.44 | 70.63 | |||||||||||
1968 | 41.94 | ----- | z | 66.32 | a | 73.29 | f | 79.82 | 100.72 | j | 93.85 | 88.61 | 89.34 | a | 75.53 | 58.16 | a | 42.36 | i | 74.20 | d | |||||
1969 | 48.98 | 50.33 | a | 58.18 | 74.67 | c | 85.37 | 90.55 | a | ----- | z | 86.88 | w | 82.05 | ----- | z | ----- | z | ----- | z | 70.02 | e | ||||
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.04 | s | 59.60 | d | ----- | z | 59.60 | k |
1971 | 39.19 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 94.40 | 89.89 | 81.97 | 65.85 | a | 52.40 | 44.10 | 71.43 | f | |||||
1973 | 41.79 | 49.46 | 52.32 | a | 62.11 | b | 77.79 | 85.08 | f | 92.68 | 88.98 | 81.60 | a | ----- | z | 58.03 | a | 50.03 | 65.48 | b | ||||||
1974 | 44.27 | a | 50.04 | 63.22 | a | 67.86 | w | 79.71 | 91.42 | 91.77 | a | 90.77 | a | 84.05 | 72.35 | 55.65 | 46.21 | 69.95 | a | |||||||
1975 | 44.41 | b | 49.73 | 54.55 | b | 59.00 | 73.47 | 85.75 | 92.22 | a | 90.85 | 82.18 | 71.85 | 57.42 | 47.74 | 67.43 | ||||||||||
1976 | 47.60 | 53.93 | 56.70 | a | 66.38 | 79.63 | a | 87.48 | d | 90.92 | 89.34 | 81.12 | 69.71 | 58.21 | b | 46.79 | 68.98 | |||||||||
1977 | 44.68 | 54.23 | 54.80 | a | 69.72 | 70.57 | a | 88.12 | b | 91.50 | a | 92.26 | d | 85.92 | 74.35 | 60.38 | a | 53.84 | b | 70.03 | ||||||
1978 | 49.13 | 52.18 | 62.16 | 67.10 | 75.35 | e | 89.92 | 93.00 | 90.05 | 81.05 | a | 73.63 | 56.24 | c | 40.77 | 69.21 | ||||||||||
1979 | 41.74 | 48.52 | a | ----- | z | 69.76 | e | 74.16 | 86.02 | a | 92.48 | 86.93 | b | 86.45 | 74.23 | a | ----- | z | 47.45 | 70.77 | b | |||||
1980 | 50.35 | 54.53 | 57.00 | a | 67.60 | a | 73.77 | a | 88.23 | ----- | z | 90.31 | 83.12 | 68.97 | 56.67 | 50.87 | 67.40 | a | ||||||||
1981 | 50.53 | 53.75 | 57.35 | 73.20 | 77.06 | 90.97 | 92.66 | 88.44 | 80.48 | 67.53 | 59.87 | 50.15 | 70.17 | |||||||||||||
1982 | 46.02 | a | 50.86 | 58.07 | a | 66.98 | 75.43 | a | 84.89 | b | 88.31 | 85.17 | a | 80.57 | 65.79 | c | 54.42 | 46.67 | a | 66.93 | ||||||
1983 | 47.00 | a | 52.59 | 57.77 | a | 61.02 | 73.88 | c | 85.59 | b | 87.56 | 84.66 | 82.50 | a | 68.68 | 56.19 | a | 50.73 | a | 67.35 | ||||||
1984 | 47.71 | 51.78 | 60.88 | a | 66.90 | 83.34 | 85.60 | 87.62 | a | 85.05 | a | 82.43 | a | 64.18 | 56.72 | 48.95 | a | 68.43 | ||||||||
1985 | 45.85 | 49.70 | 58.25 | a | 70.25 | 78.63 | a | 89.32 | 91.27 | 90.52 | a | 76.52 | 69.95 | 54.95 | a | 46.11 | 68.44 | |||||||||
1986 | 51.34 | 55.45 | 62.84 | 67.46 | b | 77.98 | 87.88 | b | 88.74 | 89.72 | b | 76.97 | 64.19 | b | 54.34 | b | 45.98 | 68.57 | ||||||||
1987 | 43.30 | a | 50.30 | c | 55.48 | c | 70.10 | f | 75.63 | a | 86.24 | a | 87.86 | b | 85.25 | a | 80.04 | b | 69.24 | 53.05 | a | 44.53 | 66.45 | a | ||
1988 | 45.55 | a | 53.57 | b | 61.43 | c | 67.50 | c | 76.45 | b | 85.39 | b | 92.37 | 86.85 | 79.27 | 72.40 | 57.12 | 47.95 | a | 68.82 | ||||||
1989 | 43.74 | 51.39 | a | 66.40 | b | 77.31 | a | 79.98 | 88.63 | 93.18 | a | 87.23 | 81.92 | 70.12 | a | 58.27 | 48.08 | a | 70.52 | |||||||
1990 | 48.05 | 51.52 | 62.48 | 70.31 | a | 77.31 | 90.68 | 91.82 | 87.21 | 81.10 | a | 70.25 | a | 56.30 | 41.75 | a | 69.07 | |||||||||
1991 | 44.35 | a | 56.14 | 55.85 | 67.63 | 75.62 | a | 85.67 | c | 92.90 | 90.98 | a | 82.78 | a | 73.30 | a | 55.79 | b | 46.95 | 69.00 | ||||||
1992 | 45.58 | 55.26 | 59.98 | 74.37 | 78.22 | b | 86.20 | 90.77 | 90.23 | a | 82.97 | a | 73.63 | 54.05 | 42.65 | 69.49 | ||||||||||
1993 | 48.26 | 52.86 | 61.83 | b | 70.35 | 79.60 | 86.92 | 92.30 | a | 86.53 | ----- | z | 68.91 | b | 54.39 | c | 46.97 | 68.08 | a | |||||||
1994 | 47.50 | a | 50.84 | 63.77 | a | 68.70 | 76.78 | a | 91.29 | b | 93.16 | 90.68 | 82.60 | 67.50 | 52.90 | 48.20 | a | 69.49 | ||||||||
1995 | 48.33 | a | 57.61 | a | 60.39 | 66.14 | a | 73.72 | b | 82.84 | b | 91.03 | a | 90.35 | 82.42 | 71.13 | d | 60.04 | c | 50.73 | a | 69.56 | ||||
1996 | 49.98 | a | 57.24 | b | 62.46 | d | 71.35 | 82.26 | 90.67 | a | 92.38 | a | 90.17 | a | 80.30 | 68.64 | c | 57.07 | b | 50.27 | 71.07 | |||||
1997 | 48.55 | 52.94 | b | 64.80 | c | 65.09 | a | 80.36 | b | 85.18 | 90.29 | 86.19 | 80.26 | a | 67.48 | d | ----- | z | 45.03 | a | 69.65 | a | ||||
1998 | 49.92 | 50.17 | b | 58.70 | c | 62.72 | c | 74.54 | c | 83.15 | c | 90.88 | f | 89.56 | d | 79.87 | d | 68.56 | d | 54.81 | a | 46.93 | d | 65.36 | a | |
1999 | 49.71 | c | 54.92 | c | 64.71 | b | 63.02 | g | 74.94 | e | 85.37 | d | 86.87 | e | 84.52 | b | 78.64 | e | 70.79 | b | 60.02 | a | 47.94 | 68.95 | a | |
2000 | 50.65 | 55.61 | b | 58.62 | f | 72.69 | c | 82.04 | c | 88.41 | c | 90.41 | c | 87.71 | e | 82.83 | c | 68.77 | c | 49.80 | b | 49.15 | d | 70.73 | a | |
2001 | 46.45 | b | 51.68 | f | 60.10 | b | 66.90 | d | 80.28 | h | 88.98 | f | 88.70 | c | 87.04 | c | 83.73 | b | 74.56 | o | 59.72 | 44.80 | d | 67.18 | d | |
2002 | 46.17 | e | 52.52 | b | 56.70 | d | 72.42 | e | 77.71 | b | 88.89 | b | 93.72 | h | 89.93 | c | 79.74 | c | 66.56 | g | 55.94 | d | 46.63 | e | 66.67 | b |
2003 | 51.10 | b | 51.57 | g | 57.74 | f | 64.41 | g | 79.03 | b | 87.63 | 94.28 | d | 88.32 | f | 83.41 | b | 74.17 | g | 56.58 | d | 48.31 | d | 71.48 | e | |
2004 | 47.52 | 47.65 | b | 66.29 | b | 67.30 | c | 78.80 | c | 86.69 | c | 89.21 | b | 86.17 | b | 79.96 | b | 66.82 | a | 53.50 | c | 46.59 | b | 68.04 | ||
2005 | 49.78 | b | 52.41 | 56.50 | f | 65.39 | h | 77.24 | j | 82.24 | a | 91.23 | c | 83.78 | d | 80.11 | c | 69.36 | c | 58.47 | a | 47.65 | e | 68.34 | c | |
2006 | 49.61 | c | 54.95 | f | 55.96 | d | 67.85 | c | 80.54 | e | 88.48 | c | 90.24 | b | 84.40 | g | 77.53 | 66.46 | e | 56.98 | b | 45.35 | g | 70.41 | c | |
2007 | 44.39 | c | 53.36 | c | 62.28 | a | 68.78 | c | 78.50 | e | 87.79 | b | 92.06 | 89.14 | b | 83.14 | a | 70.21 | b | 60.85 | 45.24 | 69.64 | ||||
2008 | 44.91 | b | 50.27 | c | 59.47 | b | 67.31 | c | 72.66 | f | 86.38 | e | ----- | z | ----- | z | ----- | z | 68.69 | o | 60.92 | k | 46.75 | k | 61.67 | g |
2009 | 47.40 | a | 51.87 | a | 60.21 | b | 65.35 | c | 80.15 | a | 80.91 | b | 91.86 | b | 88.24 | b | 82.54 | c | 68.35 | d | 58.40 | e | 43.86 | b | 68.26 | |
2010 | 45.28 | d | 49.58 | d | 57.13 | h | 64.24 | e | 73.06 | 86.75 | 92.04 | g | 86.87 | 84.48 | a | 67.13 | 53.42 | 49.74 | b | 66.06 | b | |||||
2011 | 45.22 | b | 48.46 | a | 59.45 | 66.70 | 71.64 | j | 84.85 | 89.15 | 90.15 | 80.40 | 68.56 | 55.29 | a | 43.98 | 66.57 | a | ||||||||
2012 | 47.76 | 51.40 | 60.15 | 69.37 | 79.92 | 90.05 | 88.39 | 85.81 | 80.42 | 70.73 | 57.83 | 48.42 | a | 69.19 | ||||||||||||
2013 | 43.15 | 48.25 | 62.06 | 68.48 | 76.94 | 89.42 | 89.00 | 84.18 | a | 77.57 | a | 64.79 | 56.02 | 44.13 | 67.00 | |||||||||||
2014 | 48.19 | 56.00 | 62.47 | 67.85 | 76.08 | 88.12 | 91.60 | 84.62 | a | 83.05 | 72.23 | 59.43 | a | 50.23 | 69.99 | |||||||||||
2015 | 47.47 | 56.64 | 63.10 | 67.33 | 71.18 | 88.33 | 88.29 | 86.40 | 82.10 | 69.77 | 54.67 | 46.11 | 68.45 | |||||||||||||
2016 | 46.23 | 54.62 | 62.97 | 66.76 | a | 73.61 | 90.90 | 91.90 | 84.69 | 79.07 | 72.42 | 59.43 | 48.47 | 69.26 | ||||||||||||
2017 | 47.89 | 55.23 | 63.24 | 67.72 | 75.18 | 90.17 | 91.37 | a | 88.40 | 80.85 | 71.79 | c | 62.94 | d | 49.13 | 70.32 | ||||||||||
2018 | 50.76 | 52.88 | 59.34 | 72.66 | a | 77.97 | 88.95 | a | 90.67 | a | 88.95 | a | 82.03 | 65.15 | 54.43 | 46.56 | 69.19 | |||||||||
2019 | 45.24 | 46.82 | 59.66 | 67.84 | b | 67.65 | 83.10 | ----- | z | 89.06 | e | 82.15 | 66.68 | c | 55.23 | 46.18 | 64.51 | a | ||||||||
2020 | 48.10 | 51.89 | a | 59.26 | 68.16 | h | 79.79 | 86.91 | b | 91.73 | 92.90 | 84.40 | 74.62 | b | 59.27 | 46.13 | a | 70.45 | a | |||||||
2021 | 45.98 | 53.08 | b | 57.33 | e | 71.40 | a | 78.35 | 91.18 | 91.79 | 90.28 | a | 85.37 | 67.31 | 60.62 | 49.71 | 70.20 | |||||||||
2022 | 47.88 | c | 50.70 | 58.95 | 71.02 | 79.54 | d | 89.09 | c | 92.36 | b | 88.97 | 84.63 | d | 69.48 | 52.65 | 47.58 | 69.40 | ||||||||
2023 | 47.16 | c | 48.81 | a | 54.19 | 66.16 | a | 75.73 | 82.45 | 93.98 | b | 86.25 | a | 81.15 | 71.37 | a | 58.15 | 49.95 | c | 67.95 | ||||||
2024 | 48.32 | 53.55 | a | 58.58 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.94 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 46.65 | 52.01 | 59.64 | 68.31 | 77.26 | 86.98 | 91.28 | 88.25 | 82.15 | 70.27 | 56.52 | 47.20 | 68.97 | |||||||||||||
S.D. | 2.79 | 3.16 | 3.31 | 3.36 | 3.21 | 2.61 | 1.82 | 2.15 | 2.47 | 3.15 | 2.89 | 2.71 | 1.00 | |||||||||||||
SKEW | -1.01 | -0.10 | -0.05 | -0.02 | -0.42 | -0.34 | -0.36 | -0.15 | 0.10 | 0.33 | 0.15 | -0.12 | -0.06 | |||||||||||||
MAX | 51.34 | 59.70 | 66.40 | 77.31 | 85.37 | 91.52 | 94.84 | 92.90 | 89.34 | 79.32 | 64.20 | 53.84 | 71.07 | |||||||||||||
MIN | 35.24 | 43.46 | 52.32 | 59.00 | 67.65 | 80.23 | 86.87 | 83.78 | 76.52 | 64.18 | 49.80 | 40.44 | 66.93 | |||||||||||||
YRS | 82 | 78 | 75 | 73 | 78 | 79 | 75 | 78 | 78 | 76 | 75 | 78 | 44 |