YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.06 | 90.06 | 81.57 | b | 78.55 | 69.86 | a | 48.57 | a | 76.61 | f | |||
1928 | 58.23 | 53.55 | 68.48 | 71.53 | 80.00 | 88.77 | 91.94 | 85.26 | 82.80 | 75.13 | 57.20 | 53.53 | a | 72.20 | ||||||||||||
1929 | 53.26 | 49.73 | b | 62.42 | 74.70 | 73.23 | 88.03 | 90.29 | 91.35 | 81.30 | 72.32 | 51.07 | a | 58.63 | a | 70.53 | ||||||||||
1930 | 43.53 | a | 64.29 | 61.40 | a | 78.23 | 77.10 | 87.53 | 91.42 | 92.10 | 87.37 | 68.77 | 58.33 | 47.65 | 71.48 | |||||||||||
1931 | 50.90 | 54.78 | a | 59.67 | a | 66.04 | b | 74.03 | 90.23 | 87.10 | b | 86.35 | 89.13 | 76.52 | 60.50 | 50.23 | 70.46 | |||||||||
1932 | 49.90 | a | 64.34 | 60.00 | 76.50 | 80.81 | 87.67 | 93.97 | 90.39 | 79.43 | 72.35 | 64.33 | 43.00 | a | 71.89 | |||||||||||
1933 | 57.26 | 54.22 | a | 68.00 | 72.43 | 83.32 | 93.80 | 95.84 | 90.39 | 89.33 | 80.61 | 67.52 | a | 64.87 | 76.47 | |||||||||||
1934 | 57.71 | 59.96 | 65.67 | a | 77.07 | 86.00 | 95.57 | 98.81 | 95.06 | 86.83 | 83.06 | 66.03 | 57.16 | 77.41 | ||||||||||||
1935 | 59.68 | 59.92 | b | 68.10 | 74.83 | 78.66 | b | 88.70 | 92.97 | 93.10 | 83.25 | b | 78.42 | 61.27 | 53.42 | 74.36 | ||||||||||
1936 | 51.86 | b | 58.74 | b | 70.06 | 77.53 | 83.16 | 94.10 | 94.42 | 96.68 | 82.34 | a | 74.21 | b | 63.59 | a | 57.58 | 75.36 | ||||||||
1937 | 50.73 | a | 58.80 | c | 60.23 | a | 76.72 | a | 83.32 | 91.37 | 97.39 | 97.13 | 86.33 | 78.50 | a | 64.67 | 55.38 | b | 75.05 | |||||||
1938 | 56.35 | 58.93 | a | 69.40 | a | 76.59 | a | 83.74 | 90.00 | a | 92.77 | 96.06 | 87.90 | 78.45 | 63.17 | a | 58.00 | a | 75.95 | |||||||
1939 | 55.37 | a | 51.14 | 69.90 | a | 76.86 | a | 84.39 | 94.63 | 95.68 | 91.97 | 90.67 | 78.00 | 61.77 | 60.20 | a | 75.88 | |||||||||
1940 | 47.00 | b | 55.83 | 69.45 | 75.29 | b | 84.23 | a | 88.57 | 98.16 | 88.71 | 87.33 | 79.65 | 60.86 | a | 58.80 | a | 74.49 | ||||||||
1941 | 53.35 | 56.81 | a | 58.00 | 71.34 | a | 78.90 | a | 85.63 | 88.87 | 90.71 | 82.79 | a | 71.21 | b | 66.13 | 55.83 | a | 71.63 | |||||||
1942 | 56.13 | a | 56.00 | 64.58 | 73.62 | a | 82.39 | 92.57 | 94.13 | 89.61 | 82.55 | a | 72.94 | 69.62 | a | 56.50 | a | 74.22 | ||||||||
1943 | 54.66 | b | 63.15 | a | 67.00 | a | 80.90 | 80.74 | 92.63 | 94.45 | 100.29 | 86.40 | 75.94 | 64.14 | a | 50.23 | 75.88 | |||||||||
1944 | 53.94 | 57.41 | 66.20 | a | 73.53 | 82.10 | 92.97 | 93.52 | 93.58 | 84.83 | a | 76.53 | a | 62.83 | 51.45 | b | 74.07 | |||||||||
1945 | 55.68 | 61.04 | b | 71.06 | 73.67 | 89.60 | a | 92.70 | 88.39 | 93.55 | 89.41 | a | 73.23 | 67.87 | 54.48 | 75.89 | ||||||||||
1946 | 49.83 | a | 61.61 | 70.87 | 83.83 | 82.06 | 92.97 | 97.71 | 93.74 | 83.14 | a | 74.06 | 61.64 | b | 59.37 | a | 75.90 | |||||||||
1947 | 50.23 | 53.71 | 60.83 | a | 71.34 | a | 81.00 | 93.83 | 95.35 | 92.90 | 90.13 | 78.31 | b | 55.50 | 54.84 | 73.17 | ||||||||||
1948 | 46.29 | 50.34 | 58.90 | 79.60 | 84.29 | 93.27 | 93.35 | 92.94 | 85.77 | 73.90 | 60.10 | 57.74 | 73.04 | |||||||||||||
1949 | 38.03 | 54.11 | 65.45 | 68.37 | 80.29 | 88.83 | 91.87 | 88.87 | 81.50 | 71.48 | 70.43 | 53.03 | a | 71.02 | ||||||||||||
1950 | 60.19 | 63.64 | 67.16 | 75.87 | 83.48 | 92.80 | 86.26 | 87.81 | 77.17 | 79.42 | 65.57 | 58.29 | 74.80 | |||||||||||||
1951 | 52.77 | 56.93 | 61.52 | 72.87 | 80.16 | 88.50 | 93.48 | 91.03 | 85.83 | 76.06 | 58.07 | 53.03 | 72.52 | |||||||||||||
1952 | 56.06 | 60.00 | 62.42 | 70.47 | 82.52 | 94.37 | 89.35 | 93.81 | 82.37 | 74.19 | 56.17 | 52.81 | 72.88 | |||||||||||||
1953 | 61.87 | 56.86 | 69.55 | 73.69 | a | 80.81 | 97.67 | 93.06 | 90.00 | 88.97 | 74.55 | 61.57 | 50.19 | 74.90 | ||||||||||||
1954 | 56.71 | 65.07 | 62.29 | 78.70 | 76.58 | 91.53 | 96.06 | 90.55 | 87.40 | 73.42 | 65.67 | 58.42 | 75.20 | |||||||||||||
1955 | 51.45 | 54.96 | 65.48 | 75.33 | 79.03 | 89.63 | 89.71 | 91.00 | 85.43 | 75.45 | 63.77 | 58.97 | 73.35 | |||||||||||||
1956 | 56.39 | 50.14 | 69.19 | 75.00 | 88.16 | 93.93 | 94.03 | 92.23 | 91.17 | 79.19 | 61.63 | 59.06 | 75.84 | |||||||||||||
1957 | 53.32 | 61.54 | 62.00 | 68.17 | 76.74 | 87.80 | 95.55 | 89.52 | 80.80 | 67.19 | 52.87 | 59.71 | 71.27 | |||||||||||||
1958 | 48.35 | 54.61 | 51.13 | 67.30 | 81.10 | 91.13 | 93.42 | 91.26 | 81.17 | 68.61 | 63.50 | 55.35 | 70.58 | |||||||||||||
1959 | 53.03 | 54.11 | 64.45 | 71.30 | 81.32 | 90.37 | 89.55 | 90.52 | 87.17 | 70.39 | 57.10 | 53.87 | 71.93 | |||||||||||||
1960 | 46.45 | 49.48 | 60.42 | 77.63 | 84.16 | 91.53 | 89.03 | 89.16 | 83.87 | 72.58 | 63.63 | 44.77 | 71.06 | |||||||||||||
1961 | 49.71 | 56.46 | 63.19 | 72.87 | 83.26 | 89.60 | 88.45 | 87.81 | 82.57 | 75.35 | 52.13 | 51.26 | 71.06 | |||||||||||||
1962 | 47.10 | 64.32 | 60.65 | 73.67 | 89.06 | 88.10 | 89.29 | 91.58 | 80.33 | 72.65 | 61.69 | a | 53.84 | 72.69 | ||||||||||||
1963 | 49.23 | a | 57.18 | 65.71 | 77.03 | 83.10 | a | 85.30 | 91.71 | 88.45 | 84.93 | 81.32 | 65.17 | 50.45 | 73.30 | |||||||||||
1964 | 53.84 | 47.00 | 64.03 | 76.47 | 84.65 | 90.13 | 96.13 | 92.23 | 81.07 | 77.97 | 62.43 | 53.61 | 73.30 | |||||||||||||
1965 | 58.35 | 54.64 | 57.13 | 76.50 | 82.32 | 87.50 | 93.13 | 89.06 | 83.33 | 75.13 | 68.63 | 57.71 | 73.62 | |||||||||||||
1966 | 47.16 | 52.82 | 68.39 | 72.83 | 80.84 | 86.27 | 95.68 | 84.74 | 80.80 | 73.45 | 68.27 | 55.06 | 72.19 | |||||||||||||
1967 | 58.16 | 58.89 | 72.87 | 79.00 | 81.94 | 86.83 | 88.68 | 88.23 | 81.20 | 77.90 | 64.10 | 49.81 | 73.97 | |||||||||||||
1968 | 52.45 | 53.90 | 62.26 | 70.63 | 79.29 | 91.73 | 88.03 | 88.06 | 82.33 | 75.26 | 58.03 | 55.55 | b | 71.46 | ||||||||||||
1969 | 58.80 | a | 55.29 | 52.03 | a | 72.37 | 78.71 | 86.40 | 93.77 | 91.87 | 80.93 | 66.97 | 61.97 | 56.61 | 71.31 | |||||||||||
1970 | 50.42 | 58.57 | 57.42 | 71.03 | 83.10 | 87.90 | 90.61 | 90.81 | 81.63 | 68.52 | 62.30 | 60.48 | 71.90 | |||||||||||||
1971 | 55.94 | 54.75 | 65.52 | 71.77 | 80.65 | 90.07 | 90.10 | 81.74 | 79.10 | 72.06 | 63.07 | 52.97 | 71.48 | |||||||||||||
1972 | 56.77 | 60.83 | 72.19 | 78.53 | 78.68 | 88.63 | 87.03 | 85.16 | 81.60 | 72.65 | 51.27 | 51.19 | 72.04 | |||||||||||||
1973 | 45.45 | 52.04 | 60.61 | 65.20 | 78.74 | 87.83 | 88.58 | 90.77 | 82.07 | 77.68 | 66.80 | 57.90 | 71.14 | |||||||||||||
1974 | 53.55 | 59.82 | 72.03 | 75.63 | 86.71 | 90.33 | 91.74 | 84.29 | 73.63 | 70.68 | 59.80 | 50.29 | 72.38 | |||||||||||||
1975 | 51.94 | 50.68 | 61.84 | 70.10 | ----- | z | 90.17 | 84.13 | 88.58 | 78.50 | 77.00 | 64.33 | 57.10 | 70.40 | a | |||||||||||
1976 | 55.32 | 65.07 | 64.83 | a | 75.13 | 78.06 | 88.83 | 85.61 | 89.40 | a | 79.93 | 67.19 | 55.27 | 54.58 | 71.60 | |||||||||||
1977 | 46.48 | 58.64 | 63.42 | 70.80 | 82.45 | 92.77 | 93.19 | 91.29 | 89.47 | 75.52 | 65.93 | 58.45 | 74.03 | |||||||||||||
1978 | 45.06 | 44.36 | 65.00 | 79.50 | 80.77 | 90.33 | 94.87 | 89.35 | 82.50 | 75.32 | 58.07 | 49.71 | 71.24 | |||||||||||||
1979 | 41.29 | 56.07 | 62.61 | 72.30 | 79.17 | b | 85.67 | 91.77 | 87.58 | 85.70 | 79.58 | 55.63 | 52.48 | 70.82 | ||||||||||||
1980 | 52.42 | 56.83 | 64.06 | 71.13 | 78.42 | 97.30 | 97.19 | 91.39 | 84.37 | 72.84 | 58.27 | 59.19 | 73.62 | |||||||||||||
1981 | 55.35 | 60.61 | 61.23 | 76.70 | 80.16 | 93.27 | 92.16 | 85.39 | 81.52 | a | 70.19 | 66.33 | 58.16 | 73.42 | ||||||||||||
1982 | 52.55 | 52.07 | 65.55 | 71.10 | 80.13 | 85.70 | 91.42 | 92.35 | 87.87 | 74.23 | 59.23 | 48.00 | 71.68 | |||||||||||||
1983 | 46.94 | 52.75 | 63.42 | 67.67 | 82.10 | 87.57 | 97.60 | a | 97.71 | 90.73 | 75.87 | 64.29 | b | 44.03 | a | 72.56 | ||||||||||
1984 | 49.48 | 60.28 | 64.89 | c | 71.97 | 85.45 | 89.97 | a | 93.84 | 88.61 | 82.33 | 68.19 | 60.90 | a | 52.35 | 72.36 | ||||||||||
1985 | 47.39 | 52.54 | 65.71 | 77.43 | 83.65 | e | 87.87 | 95.94 | 96.48 | 83.47 | 73.45 | 64.67 | 52.57 | a | 73.43 | |||||||||||
1986 | 59.52 | 58.68 | 69.52 | 78.86 | a | 82.45 | 85.70 | 94.16 | 90.00 | a | 82.33 | 69.93 | b | 57.96 | b | 47.14 | c | 73.02 | ||||||||
1987 | 49.70 | a | 54.74 | a | 60.10 | 71.30 | 79.74 | 88.80 | 91.74 | 88.84 | 81.90 | 74.87 | 62.83 | a | 50.97 | b | 71.29 | |||||||||
1988 | 46.55 | 58.29 | a | 65.94 | 73.24 | a | 79.48 | 87.83 | 88.74 | 89.39 | 82.79 | a | 73.45 | 65.40 | 52.90 | 72.00 | ||||||||||
1989 | 58.16 | 52.07 | 71.55 | 77.28 | a | 85.68 | 84.90 | 91.17 | a | 89.60 | a | 81.10 | 77.71 | 66.17 | 47.29 | 73.56 | ||||||||||
1990 | 54.52 | 58.93 | a | 60.90 | 71.21 | a | 80.97 | 98.80 | 89.03 | 89.19 | 84.80 | 73.58 | 64.43 | 51.94 | 73.19 | |||||||||||
1991 | 46.10 | a | 61.56 | a | 67.06 | 76.23 | 87.44 | f | 92.89 | b | 90.29 | 88.61 | 77.77 | 76.61 | 54.43 | 50.52 | 71.10 | a | ||||||||
1992 | 47.77 | 59.48 | 68.26 | 74.70 | 77.79 | b | 84.80 | 90.47 | a | 88.10 | b | 84.89 | b | 78.50 | a | 56.37 | 50.77 | 71.83 | ||||||||
1993 | 49.50 | c | 55.17 | e | 65.57 | j | 74.90 | 81.29 | 90.23 | 92.87 | 90.94 | 83.86 | a | 71.65 | 57.80 | 56.74 | 73.18 | a | ||||||||
1994 | 54.35 | 58.11 | 65.97 | 73.53 | 78.06 | 94.67 | 93.81 | 91.23 | 85.70 | 74.52 | 62.80 | 58.45 | 74.27 | |||||||||||||
1995 | 52.87 | 61.79 | 63.90 | 71.47 | 78.00 | 88.43 | 93.39 | 90.55 | 81.07 | 76.39 | 65.63 | 54.90 | 73.20 | |||||||||||||
1996 | 55.39 | 61.21 | 62.39 | 74.70 | 89.81 | 91.13 | 90.14 | c | 87.32 | 80.27 | 74.45 | 65.40 | 57.65 | 74.15 | ||||||||||||
1997 | 47.71 | 51.04 | 69.74 | 65.37 | 78.81 | 87.60 | 93.35 | 89.42 | 85.60 | 73.45 | 59.37 | 47.84 | 70.77 | |||||||||||||
1998 | 56.87 | 58.08 | c | 61.37 | a | 71.97 | 88.77 | 95.90 | 96.39 | 89.74 | 91.60 | 76.10 | 63.62 | a | 54.65 | 75.42 | ||||||||||
1999 | ----- | z | 63.50 | 64.31 | b | 72.69 | a | 79.16 | 89.13 | 91.73 | a | 91.52 | b | 81.27 | 76.13 | 71.57 | 54.10 | 75.92 | a | |||||||
2000 | 60.24 | b | 68.07 | 69.03 | 78.10 | 89.89 | c | 86.84 | e | 94.52 | b | 94.65 | e | 97.15 | q | ----- | z | ----- | z | ----- | z | 80.17 | d | |||
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 90.10 | 83.85 | c | 75.06 | 61.20 | e | 55.25 | c | 73.09 | g | ||
2002 | 53.38 | b | 54.32 | 63.63 | a | 73.15 | c | 84.04 | e | 92.24 | e | 90.65 | 91.58 | 82.26 | c | 66.48 | 55.70 | 49.17 | a | 71.38 | ||||||
2003 | 55.10 | 53.54 | 65.68 | 76.70 | 83.77 | 83.69 | d | 93.19 | 92.52 | d | 80.39 | b | 76.71 | 61.63 | 56.81 | 73.31 | ||||||||||
2004 | 54.19 | 51.31 | 66.00 | 68.93 | a | 83.94 | ----- | z | 87.53 | a | 84.19 | e | 81.00 | 71.39 | 54.20 | 54.48 | 68.83 | a | ||||||||
2005 | 57.04 | d | 56.77 | b | 61.97 | 73.67 | c | 76.08 | e | 90.96 | d | 90.39 | 86.97 | 88.15 | d | 73.71 | 69.32 | e | 56.13 | 73.43 | ||||||
2006 | 61.61 | 60.32 | c | 64.14 | c | 80.52 | e | 86.15 | d | 93.17 | 94.00 | a | 89.04 | f | 80.15 | c | 72.90 | 66.60 | 53.28 | f | 75.96 | b | ||||
2007 | 43.90 | 57.93 | 67.26 | 67.07 | c | 75.76 | b | 85.80 | 88.28 | m | 91.44 | d | 85.97 | 80.61 | 65.10 | 53.32 | 70.38 | a | ||||||||
2008 | 54.24 | b | 61.45 | 67.00 | 74.30 | 82.32 | 94.40 | 88.48 | 88.74 | 81.03 | 79.19 | o | 66.83 | 57.87 | 74.24 | a | ||||||||||
2009 | 58.16 | 65.21 | 68.65 | 75.64 | b | 81.23 | 90.67 | 90.81 | 91.77 | 81.90 | 71.71 | 67.53 | 46.90 | 74.18 | ||||||||||||
2010 | 52.45 | 47.50 | 62.90 | 73.20 | 79.52 | 93.87 | 88.39 | 92.81 | 88.63 | 77.10 | 65.07 | 58.61 | 73.34 | |||||||||||||
2011 | 54.81 | j | 55.82 | 72.74 | 81.00 | 84.13 | 98.93 | 97.61 | 98.97 | 86.37 | 76.19 | 63.90 | 44.61 | 78.21 | a | |||||||||||
2012 | 59.58 | 54.97 | 72.26 | 81.30 | 84.45 | 92.93 | 93.06 | 92.26 | 84.57 | 74.03 | 70.13 | 57.10 | 76.39 | |||||||||||||
2013 | 51.68 | 55.50 | 66.65 | 73.53 | 82.87 | 91.10 | 87.90 | 89.71 | 86.43 | 75.35 | 60.53 | 51.81 | 72.76 | |||||||||||||
2014 | 56.03 | 56.89 | 65.52 | 75.13 | 81.81 | 90.33 | 90.48 | 90.61 | 79.17 | 77.03 | 58.77 | 55.29 | 73.09 | |||||||||||||
2015 | 47.10 | 57.29 | 63.10 | 73.97 | 75.48 | 87.20 | 90.87 | 91.45 | 88.73 | 73.00 | 63.47 | 56.45 | 72.34 | |||||||||||||
2016 | 54.16 | 63.10 | 70.48 | 73.83 | 78.16 | 89.03 | 96.26 | 87.90 | 82.13 | 79.10 | 65.97 | 54.55 | 74.56 | |||||||||||||
2017 | 53.52 | 65.57 | 73.16 | 74.53 | 79.81 | 91.47 | 91.10 | 84.23 | 82.00 | 73.77 | 68.67 | 56.35 | 74.51 | |||||||||||||
2018 | 54.84 | 59.93 | 69.52 | 73.03 | 88.94 | 94.17 | 91.45 | 90.06 | 81.63 | 68.16 | 57.97 | 53.35 | 73.59 | |||||||||||||
2019 | 54.32 | 59.79 | 61.35 | 73.93 | 77.45 | 88.43 | 92.74 | 94.81 | 87.03 | 68.06 | 59.17 | 57.52 | 72.88 | |||||||||||||
2020 | 56.42 | 52.93 | 66.68 | 73.23 | 85.94 | 93.33 | 96.19 | 95.68 | 82.57 | 75.90 | 68.13 | 56.48 | 75.29 | |||||||||||||
2021 | 50.84 | 50.75 | 66.23 | 70.43 | 78.71 | 89.27 | 86.52 | 88.52 | 88.10 | 78.39 | 67.57 | 65.17 | a | 73.37 | ||||||||||||
2022 | 53.61 | 53.64 | 66.35 | 77.93 | 87.84 | 91.43 | 97.35 | 89.45 | 87.43 | 71.68 | 58.47 | 53.65 | 74.07 | |||||||||||||
2023 | 56.68 | 58.46 | 66.35 | 73.17 | 80.55 | 88.83 | 95.55 | 95.65 | 89.23 | 75.97 | 64.57 | 57.65 | 75.22 | |||||||||||||
2024 | 49.97 | 62.10 | 65.10 | 72.42 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.06 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 52.72 | 57.06 | 65.06 | 74.08 | 81.70 | 90.41 | 92.23 | 90.62 | 83.95 | 74.52 | 62.40 | 54.24 | 73.22 | |||||||||||||
S.D. | 4.72 | 4.63 | 4.27 | 3.64 | 3.56 | 3.24 | 3.19 | 3.27 | 3.53 | 3.52 | 4.61 | 4.28 | 1.65 | |||||||||||||
SKEW | -0.47 | -0.09 | -0.46 | -0.07 | 0.29 | 0.36 | -0.10 | 0.26 | 0.14 | -0.24 | -0.40 | -0.32 | 0.32 | |||||||||||||
MAX | 61.87 | 68.07 | 73.16 | 83.83 | 89.89 | 98.93 | 98.81 | 100.29 | 91.60 | 83.06 | 71.57 | 65.17 | 77.41 | |||||||||||||
MIN | 38.03 | 44.36 | 51.13 | 65.20 | 73.23 | 83.69 | 84.13 | 81.74 | 73.63 | 66.48 | 51.07 | 43.00 | 70.46 | |||||||||||||
YRS | 94 | 96 | 95 | 95 | 93 | 94 | 95 | 96 | 96 | 95 | 96 | 95 | 85 |