YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 16.15 | h | 14.12 | b | 30.50 | b | 46.52 | 48.31 | d | 60.83 | 64.25 | g | 65.38 | g | 54.93 | 46.34 | 30.16 | a | 12.89 | 38.29 | c | |||||
1943 | 5.98 | c | 14.84 | 17.97 | a | 39.48 | 51.92 | 66.68 | 69.76 | 66.48 | 53.00 | 46.13 | a | 23.72 | g | 19.88 | a | 41.10 | a | |||||||
1944 | 22.67 | d | 19.08 | c | 22.69 | d | 38.78 | 58.64 | b | 66.26 | a | 66.19 | 67.37 | a | 57.45 | a | 45.09 | b | 36.19 | f | 15.88 | f | 46.42 | b | ||
1945 | 10.94 | e | 14.42 | c | 35.79 | b | 41.10 | a | 48.34 | 57.54 | b | 64.19 | b | 64.40 | a | 56.33 | c | 43.15 | a | 30.85 | g | 11.32 | f | 43.62 | b | |
1946 | 15.00 | j | 14.89 | e | 38.35 | a | 45.48 | a | 51.72 | d | 62.52 | 67.84 | 63.50 | a | 56.11 | c | 49.39 | d | 31.38 | d | 17.43 | i | 48.12 | b | ||
1947 | 16.98 | f | 13.48 | c | 23.64 | c | 38.71 | b | 47.75 | c | 59.97 | a | 67.15 | a | 72.42 | 57.68 | 54.65 | a | 25.93 | c | 15.87 | d | 43.39 | a | ||
1948 | 3.20 | f | 11.29 | e | 21.78 | b | 44.70 | b | 52.26 | 60.98 | 67.40 | 65.23 | 59.12 | 44.02 | 35.30 | 16.94 | 43.55 | a | ||||||||
1949 | 15.18 | 12.32 | 24.39 | 41.22 | a | 55.98 | 67.52 | 70.94 | 68.00 | 53.78 | a | 49.32 | 32.98 | 17.39 | 42.42 | |||||||||||
1950 | 6.82 | 12.20 | 18.37 | a | 33.95 | 52.74 | ----- | z | ----- | z | 62.98 | 57.45 | b | 51.25 | a | 27.57 | a | 11.94 | 33.53 | b | ||||||
1951 | 10.03 | 13.39 | 20.48 | a | 40.35 | 60.74 | 62.62 | 68.74 | 65.11 | 55.77 | 48.27 | 24.82 | 19.75 | c | 40.84 | |||||||||||
1952 | 15.13 | a | 22.48 | 24.94 | 47.28 | 56.16 | 67.07 | 71.15 | 66.26 | 60.14 | a | 42.31 | 34.43 | 23.98 | 44.28 | |||||||||||
1953 | 18.27 | 15.95 | 29.66 | 40.88 | 57.50 | 68.62 | 69.87 | 69.82 | 59.41 | a | 54.66 | 38.68 | b | 20.77 | 45.34 | |||||||||||
1954 | 11.00 | 28.29 | 26.21 | 45.57 | 50.90 | a | 67.75 | 69.94 | 66.66 | 58.24 | a | 45.98 | 35.67 | 22.13 | 44.03 | |||||||||||
1955 | 12.21 | 13.21 | 24.58 | 50.60 | 59.57 | c | 64.12 | 74.02 | ----- | z | 60.10 | 48.84 | 26.93 | b | 11.94 | 40.56 | a | |||||||||
1956 | 12.74 | 12.19 | 24.13 | 40.63 | 55.37 | 68.53 | 65.84 | b | 66.84 | 56.07 | 54.60 | 32.32 | 21.29 | 42.55 | ||||||||||||
1957 | 6.89 | 18.05 | 28.61 | 45.00 | 54.58 | 65.62 | 71.71 | e | 66.55 | c | 56.78 | 46.45 | 31.71 | f | 21.95 | 43.84 | a | |||||||||
1958 | 19.53 | a | 13.46 | 30.06 | 46.08 | 55.98 | 60.02 | 67.56 | 67.97 | 60.96 | d | 50.55 | 34.90 | 12.23 | 43.28 | |||||||||||
1959 | 7.10 | 14.10 | c | 29.79 | 45.17 | 59.98 | 66.95 | 69.47 | 72.03 | 61.18 | 44.37 | 24.55 | a | 27.90 | 43.55 | |||||||||||
1960 | 16.33 | b | 18.14 | 19.66 | 45.63 | 55.85 | 63.20 | 68.82 | 69.60 | 61.65 | 48.85 | 35.12 | 17.68 | 43.38 | ||||||||||||
1961 | 14.18 | a | 24.18 | 33.53 | 40.30 | 53.79 | 66.17 | 69.00 | a | 69.55 | 59.65 | 50.21 | 32.57 | 17.08 | 44.18 | |||||||||||
1962 | 8.53 | b | 13.66 | 28.53 | 43.28 | 60.16 | 64.52 | 66.87 | a | 67.29 | 56.43 | 50.89 | 35.32 | b | 18.38 | c | 42.82 | |||||||||
1963 | 4.03 | a | 9.84 | 31.45 | 46.63 | 54.82 | 67.52 | 71.13 | 66.19 | 61.08 | e | 57.69 | 40.34 | h | 11.34 | 43.79 | a | |||||||||
1964 | 19.76 | 20.38 | 27.02 | 45.45 | 60.47 | 65.70 | 73.93 | c | 66.27 | 57.72 | 47.08 | 35.79 | a | 12.98 | a | 44.38 | ||||||||||
1965 | 9.16 | 11.84 | 20.35 | 41.20 | 60.39 | 63.43 | c | 68.25 | a | 65.92 | 54.17 | 49.44 | 32.87 | 25.82 | 41.90 | |||||||||||
1966 | 2.24 | b | 17.12 | 33.65 | 41.73 | 51.50 | 66.42 | 72.31 | 65.53 | 59.77 | b | 47.44 | 31.62 | 18.05 | 42.28 | |||||||||||
1967 | 16.35 | 8.45 | 28.44 | 44.30 | 50.44 | 65.25 | 67.58 | 64.00 | 58.42 | 46.50 | 28.12 | d | 20.21 | 41.50 | ||||||||||||
1968 | 12.77 | 13.84 | 37.85 | 46.67 | 53.52 | 65.27 | 69.03 | 68.08 | 58.75 | 50.81 | 33.65 | 17.65 | 43.99 | |||||||||||||
1969 | 10.53 | 18.84 | 24.32 | 46.98 | 58.47 | 58.60 | 68.82 | 70.55 | 60.13 | 45.90 | 31.81 | a | 20.21 | 42.93 | ||||||||||||
1970 | 6.16 | 13.63 | a | 23.66 | 45.93 | 58.52 | 67.78 | 71.37 | a | 68.65 | 59.65 | 50.08 | 30.72 | 19.37 | 42.96 | |||||||||||
1971 | 5.56 | 16.20 | 25.10 | 43.85 | 53.11 | 69.73 | 66.82 | 65.42 | 61.02 | 54.89 | 33.97 | a | 18.89 | 42.88 | ||||||||||||
1972 | 6.42 | 10.67 | 24.77 | 40.77 | 61.12 | a | 63.73 | 68.35 | 67.98 | a | 57.82 | 44.82 | 32.62 | 13.13 | a | 41.02 | ||||||||||
1973 | 15.65 | a | 19.95 | 38.66 | 43.90 | a | 52.90 | 67.50 | 71.37 | a | 70.48 | a | 59.77 | 53.23 | a | 33.66 | a | 18.11 | 45.43 | |||||||
1974 | 12.23 | 15.77 | 28.35 | a | 46.10 | 53.95 | a | 62.25 | 72.42 | 67.20 | a | 54.65 | 48.11 | 35.19 | a | 24.13 | 43.36 | |||||||||
1975 | 14.60 | a | 17.04 | 23.79 | 38.07 | 60.07 | a | 65.85 | 70.87 | d | 67.35 | 54.45 | a | 50.10 | a | 36.55 | b | 20.27 | g | 45.34 | a | |||||
1976 | 9.17 | b | 25.60 | 31.58 | a | 48.48 | f | 56.27 | 67.95 | 70.83 | a | 68.39 | 59.32 | 44.20 | d | 25.50 | b | 7.56 | 42.40 | a | ||||||
1977 | 0.10 | a | 20.11 | 36.43 | a | 51.30 | 65.48 | a | 64.19 | c | 72.19 | 63.98 | 58.88 | 47.48 | a | 31.70 | b | 16.66 | b | 44.04 | ||||||
1978 | 8.27 | a | 9.09 | a | 28.02 | 44.24 | a | 60.50 | a | 65.70 | g | 68.63 | 69.23 | 64.60 | a | 47.73 | 31.40 | 13.19 | 40.44 | a | ||||||
1979 | 4.41 | b | 8.44 | b | 29.06 | 41.50 | 52.70 | a | 64.03 | 70.02 | 66.35 | 61.32 | b | 45.77 | 32.07 | 25.15 | 41.74 | |||||||||
1980 | 11.80 | c | 14.60 | 24.88 | b | 46.91 | a | 59.55 | 65.79 | a | 71.82 | a | 68.45 | a | 58.97 | 43.73 | 34.70 | 17.57 | a | 43.23 | ||||||
1981 | 17.27 | a | 22.44 | a | 34.19 | b | 46.25 | b | 55.29 | 65.45 | 69.48 | 68.40 | 57.32 | b | 46.02 | 38.81 | c | 17.92 | 44.90 | |||||||
1982 | 2.91 | b | 13.68 | 27.29 | 41.05 | 62.16 | 61.32 | 71.80 | a | 67.00 | 59.13 | 50.22 | a | 32.43 | c | 25.56 | 42.88 | |||||||||
1983 | 17.76 | b | 26.59 | 32.59 | d | 39.80 | e | 53.17 | d | 65.43 | b | 73.87 | h | 73.67 | a | 61.62 | b | 49.50 | d | 36.18 | b | 7.87 | d | 42.20 | a | |
1984 | 12.90 | f | 29.39 | a | 27.71 | c | 47.29 | b | 55.37 | a | 68.92 | 69.66 | b | 73.28 | b | 62.67 | c | 51.82 | c | 32.86 | b | 16.85 | e | 48.71 | a | |
1985 | 11.42 | e | 12.52 | c | ----- | z | 49.00 | c | 60.85 | d | 63.29 | b | 69.92 | a | 65.57 | c | 58.96 | c | 49.07 | d | 28.77 | f | 10.18 | c | 45.08 | b |
1986 | 12.38 | g | 18.61 | e | 33.06 | d | 49.69 | c | 58.89 | 66.06 | f | 71.50 | 65.02 | c | 58.59 | c | 48.52 | e | 29.26 | c | 23.55 | b | 45.67 | b | ||
1987 | 18.88 | c | 27.85 | b | 36.57 | b | 50.82 | b | 60.60 | a | 68.89 | c | 72.82 | 66.91 | c | 61.02 | c | 43.00 | a | 36.10 | 24.79 | 47.35 | ||||
1988 | 9.69 | d | 12.79 | 31.75 | c | 45.41 | c | 61.25 | c | 68.30 | b | 75.60 | 71.85 | 59.34 | a | 42.20 | a | 33.56 | e | 19.41 | b | 44.26 | ||||
1989 | 18.75 | c | 9.10 | c | 23.87 | a | 42.09 | a | 54.88 | c | 62.64 | b | 70.87 | 67.16 | c | 58.89 | c | 48.06 | f | 27.96 | d | 6.83 | b | 40.28 | a | |
1990 | 23.62 | a | 18.86 | 34.03 | 45.98 | b | 54.32 | a | 65.95 | a | 68.45 | 67.77 | a | 62.02 | 47.43 | a | 37.97 | 17.26 | b | 45.30 | ||||||
1991 | 8.92 | 20.98 | 31.82 | a | 48.76 | a | 60.73 | a | 69.20 | 69.02 | 69.71 | 56.52 | 45.74 | b | 25.52 | b | 20.08 | 43.92 | ||||||||
1992 | 18.12 | a | 25.95 | a | 30.16 | 41.53 | 58.67 | a | 61.29 | a | 62.36 | b | 62.65 | 55.43 | b | 45.09 | c | 30.42 | 19.78 | a | 42.62 | |||||
1993 | 11.55 | b | 15.06 | b | 26.80 | a | 38.93 | a | 54.63 | d | 60.75 | 67.40 | b | 67.05 | b | 51.07 | a | 42.90 | 28.00 | b | 21.36 | f | 42.19 | a | ||
1994 | -0.75 | c | 8.40 | c | 28.85 | a | 42.11 | g | 55.65 | d | 65.98 | f | 67.36 | t | 64.65 | d | 61.24 | g | 49.54 | f | 36.33 | g | 22.87 | h | 31.36 | g |
1995 | 15.18 | f | 15.35 | d | 30.38 | f | 37.32 | h | 53.35 | k | 69.23 | h | 70.42 | k | 71.20 | h | 56.05 | j | 48.20 | i | 23.48 | j | 13.05 | l | 15.35 | k |
1996 | 5.18 | i | 10.09 | g | 20.55 | i | 40.07 | g | 52.77 | i | 64.37 | k | 66.16 | i | 67.20 | i | 59.33 | j | 45.89 | h | 24.12 | j | 14.89 | l | ----- | z |
1997 | 8.92 | e | 20.12 | h | 27.07 | k | 41.67 | d | 48.92 | k | 66.30 | h | 68.32 | i | 63.43 | i | 58.90 | i | 45.70 | h | 26.77 | j | 27.38 | j | 25.30 | j |
1998 | 17.29 | j | 31.05 | h | 31.15 | h | 48.17 | i | 63.38 | j | 62.38 | i | 69.89 | i | 68.80 | k | 60.45 | i | 47.32 | i | 36.63 | k | 28.06 | m | ----- | z |
1999 | 6.57 | q | 28.03 | k | 32.11 | l | 48.32 | k | 57.48 | k | 63.77 | h | 72.53 | l | 66.18 | l | 57.84 | k | 46.19 | j | 38.90 | o | 24.94 | m | ----- | z |
2000 | 11.07 | p | 22.23 | n | 39.00 | m | 42.32 | p | 56.53 | m | 61.88 | n | 67.61 | q | 68.37 | p | 57.62 | n | 47.54 | q | 31.30 | o | 2.92 | r | ----- | z |
2001 | 15.57 | p | 11.32 | i | 26.60 | k | 44.58 | k | 57.32 | i | 65.97 | m | 69.88 | k | 69.39 | i | 58.25 | l | 48.18 | l | 41.94 | m | 26.20 | p | ----- | z |
2002 | 21.97 | m | 23.26 | k | 22.11 | q | 42.95 | i | 50.76 | n | 64.47 | n | 71.78 | o | 65.68 | n | 60.21 | m | 40.41 | h | 32.07 | p | 22.47 | o | ----- | z |
2003 | 11.88 | o | 8.83 | m | 28.30 | k | 44.97 | o | 55.00 | n | 63.96 | r | 66.88 | n | 72.53 | o | 59.79 | k | 45.08 | l | 32.50 | q | 20.89 | v | ----- | z |
2004 | 7.39 | q | 20.32 | o | 32.39 | l | 44.92 | j | 53.23 | p | 62.72 | n | 67.83 | k | 62.03 | n | 61.62 | n | 48.31 | j | 34.79 | b | 17.63 | e | 26.21 | j |
2005 | 12.47 | l | 21.04 | e | 24.94 | g | 46.38 | b | 54.46 | e | 68.08 | 69.93 | b | 66.60 | b | 61.17 | f | 48.02 | c | 35.73 | j | 17.19 | e | 48.96 | d | |
2006 | 25.27 | e | 14.92 | d | 29.93 | c | 49.69 | f | 57.04 | f | 64.41 | b | 72.71 | c | 66.50 | b | 54.12 | 42.06 | g | 34.20 | b | 26.21 | b | 43.14 | c | |
2007 | 14.44 | f | 9.70 | a | 31.43 | a | 43.71 | d | 58.31 | e | 65.73 | 68.25 | c | 66.45 | 58.77 | d | 51.06 | 31.17 | g | 14.40 | b | 46.78 | b | |||
2008 | 13.00 | b | 9.66 | j | 23.98 | b | 41.17 | 51.09 | h | 63.33 | 68.58 | a | 65.84 | 58.17 | 43.04 | g | 26.77 | d | 8.65 | e | 41.05 | c | ||||
2009 | 1.06 | d | 15.62 | 27.63 | 43.70 | 55.16 | 63.73 | 63.20 | a | 64.23 | 61.63 | 40.79 | 35.17 | 15.94 | f | 42.90 | a | |||||||||
2010 | 12.15 | a | 16.59 | 37.34 | 50.00 | 57.15 | 63.98 | 69.77 | 69.21 | 55.13 | 47.63 | 33.07 | 15.08 | 43.93 | ||||||||||||
2011 | 9.06 | 14.96 | 25.52 | 40.43 | 54.02 | 63.58 | 72.89 | 67.92 | 57.98 | 50.48 | 36.68 | 24.94 | 43.21 | |||||||||||||
2012 | 17.60 | 25.05 | 43.42 | 46.12 | 58.71 | 66.63 | 73.76 | 66.58 | 56.78 | 43.81 | 34.67 | 23.63 | 46.40 | |||||||||||||
2013 | 13.82 | a | 15.77 | b | 20.85 | 35.57 | 54.10 | 63.85 | 67.89 | 68.12 | a | 60.85 | 46.19 | 27.48 | 9.11 | 40.30 | ||||||||||
2014 | 4.02 | a | 4.91 | 18.98 | 38.93 | 55.65 | 65.93 | 66.06 | 67.00 | 57.52 | 45.31 | 22.63 | 23.06 | 39.17 | ||||||||||||
2015 | 12.42 | a | 5.46 | 28.40 | 45.17 | 55.48 | 64.28 | 68.42 | 65.05 | 63.63 | 48.16 | b | 37.98 | 29.44 | 43.66 | |||||||||||
2016 | 12.74 | 18.38 | 35.66 | 43.10 | 55.32 | 64.70 | 69.47 | 66.26 | 61.95 | 50.52 | 42.07 | 18.66 | 44.90 | |||||||||||||
2017 | 17.48 | 26.48 | 29.08 | 45.92 | 53.79 | 64.65 | 68.60 | 64.39 | 61.50 | c | 49.34 | 29.35 | 15.17 | a | 43.81 | |||||||||||
2018 | 12.61 | 10.46 | 27.92 | 29.92 | 62.10 | 66.48 | 69.47 | 67.90 | 61.50 | 42.52 | 26.28 | a | 24.10 | 41.77 | ||||||||||||
2019 | 13.81 | 7.50 | 22.39 | 40.18 | 50.02 | d | 61.63 | 70.06 | n | 65.94 | 61.43 | 44.58 | 27.83 | 20.63 | 37.81 | a | ||||||||||
2020 | 18.85 | 15.69 | 33.19 | 40.78 | 54.66 | b | 66.32 | 71.48 | 68.34 | 56.93 | 40.52 | 37.27 | 23.06 | 43.92 | ||||||||||||
2021 | 18.65 | 9.14 | 37.10 | 44.00 | 54.65 | 69.35 | 69.27 | 67.90 | 60.15 | 53.39 | 33.97 | 22.52 | 45.01 | |||||||||||||
2022 | 6.42 | 11.32 | 27.40 | 38.12 | 56.68 | 65.27 | 69.42 | 67.47 | 60.45 | 46.76 | 34.80 | 16.53 | 41.72 | |||||||||||||
2023 | 20.90 | 17.98 | 26.92 | 42.38 | 57.60 | 67.73 | 67.94 | 67.73 | 63.20 | 49.79 | 34.50 | 32.35 | 45.75 | |||||||||||||
2024 | 20.64 | b | 30.50 | 33.24 | 44.47 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.13 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 12.13 | 16.09 | 28.59 | 43.43 | 56.09 | 64.99 | 69.53 | 67.26 | 58.67 | 47.80 | 32.33 | 18.52 | 43.40 | |||||||||||||
S.D. | 5.94 | 5.81 | 5.48 | 3.99 | 3.69 | 2.73 | 2.48 | 2.29 | 2.72 | 3.62 | 4.08 | 5.46 | 1.60 | |||||||||||||
SKEW | -0.05 | 0.58 | 0.24 | -0.52 | -0.01 | -0.48 | -0.28 | 0.62 | -0.36 | 0.31 | -0.32 | -0.06 | -0.14 | |||||||||||||
MAX | 25.27 | 30.50 | 43.42 | 51.30 | 65.48 | 69.73 | 75.60 | 73.67 | 64.60 | 57.69 | 42.07 | 32.35 | 47.35 | |||||||||||||
MIN | -0.75 | 4.91 | 17.97 | 29.92 | 47.75 | 57.54 | 62.36 | 62.65 | 51.07 | 40.52 | 22.63 | 6.83 | 39.17 | |||||||||||||
YRS | 66 | 73 | 71 | 70 | 70 | 68 | 67 | 70 | 70 | 68 | 64 | 66 | 45 |