YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1929 | ----- | z | ----- | z | ----- | z | 43.54 | p | 46.56 | e | 51.11 | b | 60.43 | d | 56.39 | 51.03 | 37.56 | g | ----- | z | ----- | z | 53.10 | g | ||
1930 | ----- | z | ----- | z | ----- | z | 42.65 | q | 41.89 | 53.93 | 58.00 | 55.44 | 48.75 | 40.15 | 25.55 | ----- | z | 46.24 | e | |||||||
1931 | ----- | z | ----- | z | ----- | z | 39.05 | 43.60 | 54.82 | 58.84 | 56.05 | a | 53.47 | 43.37 | ----- | z | ----- | z | 49.88 | e | ||||||
1932 | ----- | z | ----- | z | ----- | z | 37.23 | 44.67 | k | 53.88 | e | 58.93 | i | 56.87 | 49.87 | 41.60 | a | 32.83 | 15.32 | f | 45.38 | f | ||||
1933 | 13.38 | b | ----- | z | ----- | z | 39.35 | f | 46.66 | b | 57.50 | b | 62.18 | a | 59.87 | a | 57.78 | 46.10 | a | 35.35 | 31.38 | e | 45.58 | c | ||
1934 | 20.53 | 27.71 | 36.90 | 42.60 | a | 50.70 | d | 53.83 | a | 60.79 | b | 60.05 | 49.82 | 43.19 | 28.98 | a | 20.92 | 41.34 | ||||||||
1935 | 21.71 | 21.35 | a | 31.97 | b | 40.73 | b | 41.15 | a | 51.72 | e | 55.44 | 55.47 | 51.27 | 45.95 | a | 30.40 | 16.72 | b | 38.66 | ||||||
1936 | 19.03 | a | 25.12 | a | 34.32 | 38.82 | 46.45 | 53.77 | 53.39 | 52.19 | 44.70 | 36.45 | 31.27 | 20.69 | 38.02 | |||||||||||
1937 | 30.98 | h | 22.71 | b | 27.27 | 39.62 | 46.69 | 53.23 | 56.92 | 59.77 | 53.73 | 43.79 | 33.45 | 24.81 | 42.00 | a | ||||||||||
1938 | 18.57 | d | 27.69 | d | 32.84 | 38.43 | 44.87 | a | 55.70 | 56.73 | a | 58.03 | 51.23 | 42.60 | a | 28.04 | c | 23.89 | d | 39.89 | ||||||
1939 | 14.38 | f | 13.75 | d | 32.35 | d | 40.41 | c | 46.50 | b | 54.78 | a | 58.68 | a | 56.62 | c | 54.67 | 39.68 | 29.88 | 29.08 | g | 42.73 | b | |||
1940 | 13.52 | g | 17.11 | a | 31.28 | a | 39.14 | a | 47.69 | 53.28 | a | 59.08 | 56.40 | a | 52.18 | 44.08 | a | 27.71 | a | 17.96 | c | 40.54 | a | |||
1941 | 11.95 | b | 21.34 | ----- | z | 35.83 | a | 48.28 | a | 51.25 | 56.66 | 56.65 | a | 51.33 | 43.13 | 32.73 | 25.48 | d | 39.51 | a | ||||||
1942 | 17.76 | b | 18.40 | d | 23.78 | a | 40.24 | a | 45.58 | 53.40 | 57.63 | 58.09 | c | 50.93 | a | 42.10 | a | 37.05 | 22.61 | d | 38.96 | |||||
1943 | 23.75 | c | 25.87 | b | 31.40 | b | 43.07 | 48.63 | 56.15 | m | 59.47 | 61.43 | a | 51.18 | 40.74 | b | 28.98 | 9.41 | c | 38.54 | a | |||||
1944 | 11.85 | d | 17.64 | k | 24.23 | e | 34.47 | 44.86 | b | 54.21 | a | 58.05 | c | 61.74 | 49.95 | 42.42 | a | 30.04 | c | 23.33 | a | 39.56 | a | |||
1945 | 19.93 | i | 19.86 | g | 25.97 | b | 35.09 | g | 49.50 | a | 54.18 | b | 61.87 | 62.53 | 53.72 | a | 45.60 | a | 33.86 | a | 18.42 | 45.07 | c | |||
1946 | 13.42 | a | 23.83 | a | 36.55 | a | 45.93 | a | 47.82 | 59.38 | 61.53 | 61.27 | 55.23 | 42.97 | 24.88 | b | 26.64 | m | 42.98 | a | ||||||
1947 | 11.78 | b | 27.59 | 29.82 | f | 40.70 | 48.63 | 52.82 | b | 60.79 | 58.60 | 54.93 | 43.75 | c | 23.79 | b | 17.34 | b | 40.07 | a | ||||||
1948 | 17.06 | g | 24.42 | p | 23.29 | c | 41.09 | n | 50.75 | y | 54.18 | 59.11 | m | 58.39 | 52.75 | 41.47 | 27.39 | g | 25.48 | 42.59 | f | |||||
1949 | 14.31 | 21.59 | 33.45 | 39.50 | g | 47.39 | 54.92 | 59.57 | a | 56.98 | 53.10 | 41.11 | 36.53 | n | 20.37 | 40.28 | b | |||||||||
1950 | 23.23 | 30.59 | 34.34 | 41.98 | 45.95 | 54.92 | 58.15 | 55.58 | 50.42 | 47.19 | 33.18 | 28.18 | 41.98 | |||||||||||||
1951 | 23.76 | 26.59 | 31.55 | 38.65 | 47.16 | 53.03 | 61.52 | 58.85 | 50.35 | 41.11 | 26.93 | i | 19.73 | c | 41.12 | a | ||||||||||
1952 | 25.68 | 22.24 | 24.66 | 40.33 | 47.55 | 58.65 | 59.63 | 60.26 | 50.91 | b | 41.08 | 21.50 | 15.71 | 39.02 | ||||||||||||
1953 | 23.76 | 20.93 | 32.34 | 36.45 | k | ----- | z | 58.55 | 60.00 | 57.13 | 49.78 | 40.16 | b | 25.27 | 18.27 | a | 38.62 | b | ||||||||
1954 | 23.67 | a | 33.04 | 31.65 | 42.69 | a | 48.97 | a | 55.70 | 59.85 | 57.11 | 51.78 | 44.68 | 32.17 | 22.71 | 42.00 | ||||||||||
1955 | 17.61 | 18.91 | 32.56 | d | 38.02 | 46.23 | 51.95 | 57.37 | 58.13 | 50.10 | 41.19 | 32.07 | 25.42 | 39.13 | ||||||||||||
1956 | 27.97 | 18.21 | 32.15 | 35.47 | 46.85 | 56.60 | 58.74 | 55.69 | 52.05 | 40.92 | 24.66 | b | 23.08 | a | 39.37 | |||||||||||
1957 | 26.52 | a | 33.80 | 32.10 | 37.90 | 44.13 | a | 54.10 | 59.58 | 57.74 | 48.32 | 41.55 | 23.58 | 23.89 | 40.27 | |||||||||||
1958 | 22.65 | 28.75 | 28.53 | 36.12 | 49.37 | 55.52 | 58.98 | a | 58.35 | 53.60 | 41.19 | 33.20 | 29.10 | b | 41.28 | |||||||||||
1959 | 20.63 | 27.14 | 29.18 | 39.90 | 46.55 | 55.78 | 58.61 | 58.45 | 49.92 | 41.90 | a | 30.75 | 25.02 | 40.32 | ||||||||||||
1960 | ----- | z | 14.82 | a | 26.20 | d | 40.65 | 44.37 | 55.43 | 57.82 | f | 57.06 | 52.72 | 41.68 | ----- | z | 21.82 | a | 39.42 | c | ||||||
1961 | 14.37 | 23.25 | 32.13 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.59 | s | 42.48 | 30.88 | 23.54 | q | 28.62 | g | |||||
1962 | 14.50 | e | 29.61 | 26.06 | 42.13 | 46.35 | 53.05 | 57.25 | s | 57.40 | p | ----- | z | 43.26 | 31.32 | 23.48 | a | 34.42 | c | |||||||
1963 | 13.84 | 25.90 | g | 19.94 | n | 44.07 | 50.43 | a | 53.87 | 60.10 | a | 57.13 | 51.98 | 41.69 | 31.48 | i | 22.10 | p | 46.64 | d | ||||||
1964 | 13.93 | a | 10.28 | i | 20.17 | b | 31.88 | 44.17 | b | 51.97 | ----- | z | ----- | z | 49.84 | h | 40.33 | a | 29.73 | 14.42 | f | 33.17 | e | |||
1965 | 19.48 | f | 23.34 | 26.71 | 39.57 | 45.87 | a | 52.48 | 59.13 | 55.81 | b | 49.93 | 43.19 | o | 35.45 | 27.44 | 41.57 | b | ||||||||
1966 | 19.89 | 20.38 | 33.18 | 40.68 | 50.13 | 56.07 | 63.29 | 58.38 | a | 51.70 | 41.85 | 34.73 | 23.82 | 41.18 | ||||||||||||
1967 | 21.93 | a | 25.14 | 36.92 | 40.50 | 45.52 | 55.90 | 61.16 | 56.56 | 51.78 | 41.73 | 33.47 | 19.84 | 40.87 | ||||||||||||
1968 | 18.73 | 25.78 | 32.34 | 34.15 | 46.92 | 55.68 | 58.77 | a | 56.88 | a | 49.50 | 42.90 | 28.98 | 20.94 | 39.30 | |||||||||||
1969 | 27.06 | 20.50 | 20.75 | a | 40.65 | 47.58 | 52.43 | 61.23 | 60.40 | 51.62 | 39.87 | a | 29.48 | 23.05 | 39.55 | |||||||||||
1970 | 18.89 | 28.78 | a | 27.63 | 33.07 | 46.63 | 52.08 | 60.92 | 59.52 | 49.95 | a | 37.50 | 34.10 | 25.26 | 39.53 | |||||||||||
1971 | 21.60 | a | 25.86 | 31.84 | 36.50 | 43.27 | 53.02 | 59.60 | 56.20 | a | 48.70 | 40.40 | 30.78 | e | 19.63 | 38.95 | ||||||||||
1972 | 22.16 | 27.86 | 35.55 | 40.38 | 44.84 | 54.58 | 60.08 | e | 57.19 | 53.08 | 45.60 | a | 24.93 | 22.35 | a | 40.72 | ||||||||||
1973 | 15.98 | 21.98 | b | 29.62 | a | 31.53 | 45.79 | 53.42 | 59.32 | 57.93 | b | 49.84 | a | 43.19 | b | 34.02 | d | 23.93 | b | 38.88 | ||||||
1974 | 16.69 | e | 15.62 | 36.46 | c | 38.62 | 49.40 | 55.07 | 58.78 | b | 54.50 | a | 50.62 | a | 43.97 | a | 30.95 | 14.27 | a | 38.75 | ||||||
1975 | 14.69 | 17.46 | 28.45 | 35.40 | 43.18 | 53.33 | a | 58.45 | 57.56 | 50.00 | 41.71 | 28.60 | 17.32 | 37.18 | ||||||||||||
1976 | 14.17 | a | 29.25 | a | 30.56 | 39.07 | 44.53 | 53.25 | 58.48 | a | 56.32 | 52.07 | p | 38.34 | 26.83 | 9.27 | a | 36.37 | a | |||||||
1977 | 12.81 | 17.73 | 25.23 | 39.77 | 45.87 | 56.38 | a | 59.22 | a | 59.71 | 53.20 | 42.79 | 33.85 | c | 28.23 | 39.56 | ||||||||||
1978 | 24.85 | 25.29 | 33.50 | 40.50 | 44.59 | b | 55.28 | 59.97 | a | 57.18 | 52.03 | 42.55 | 33.10 | 18.19 | 40.59 | |||||||||||
1979 | 16.48 | 21.05 | 31.95 | 38.73 | 46.31 | 53.87 | 59.63 | 57.13 | 52.76 | a | 44.97 | 25.13 | 23.87 | 39.32 | ||||||||||||
1980 | 24.89 | 27.64 | 31.11 | 35.93 | 45.47 | 57.20 | 62.47 | 58.76 | 53.15 | 40.06 | 30.97 | 32.50 | 41.68 | |||||||||||||
1981 | 25.58 | a | 28.05 | 31.15 | 42.35 | 47.32 | 59.57 | b | 61.65 | 58.23 | a | 52.87 | c | 43.62 | a | 35.18 | 26.74 | 42.69 | ||||||||
1982 | 20.21 | 16.37 | a | 30.52 | k | 39.18 | h | 45.88 | f | 53.62 | 59.92 | 60.05 | b | 53.78 | a | 39.79 | q | 31.46 | b | 22.05 | 39.68 | d | ||||
1983 | 18.97 | 23.82 | 32.15 | h | ----- | z | ----- | z | 52.58 | 60.60 | 60.15 | 54.90 | a | 42.68 | c | 30.60 | 22.30 | a | 40.73 | c | ||||||
1984 | 13.75 | a | 16.67 | e | 26.87 | a | 35.52 | 51.47 | 54.38 | 60.00 | 59.27 | 53.28 | a | 38.27 | 33.15 | 25.11 | c | 38.98 | ||||||||
1985 | 15.03 | 21.71 | 29.60 | 41.42 | 48.10 | 56.33 | 59.97 | 59.56 | 50.82 | 43.97 | 35.50 | 25.98 | 40.67 | |||||||||||||
1986 | 26.53 | a | 29.45 | 37.15 | 42.60 | 47.89 | 55.47 | 59.94 | 59.15 | 50.47 | 39.31 | 31.72 | 16.88 | a | 41.38 | |||||||||||
1987 | 14.87 | 20.55 | 24.34 | 38.88 | 46.31 | 56.18 | 59.27 | 58.94 | 50.03 | 44.16 | 31.20 | 21.42 | 38.85 | |||||||||||||
1988 | 14.82 | 26.26 | 30.11 | 38.72 | a | 46.55 | 56.68 | 59.82 | 59.10 | 50.57 | 44.47 | 32.73 | 20.15 | a | 40.00 | |||||||||||
1989 | 16.87 | a | 21.30 | 35.55 | a | 43.10 | a | 48.40 | g | 55.71 | a | 60.34 | 57.73 | 51.83 | 42.73 | a | 33.55 | 16.81 | 39.59 | a | ||||||
1990 | 15.74 | 19.59 | a | 32.68 | 41.28 | 46.11 | 58.98 | 59.19 | 56.29 | 54.82 | 44.03 | a | 33.80 | b | 18.29 | b | 40.07 | |||||||||
1991 | 16.94 | 25.32 | 31.06 | 39.37 | 47.85 | 55.72 | 59.21 | 59.35 | 51.95 | a | 43.48 | 27.90 | 18.87 | 39.75 | ||||||||||||
1992 | 12.52 | b | 23.59 | 33.45 | 42.45 | 49.08 | 53.98 | 59.18 | 60.15 | 54.00 | a | 44.84 | 23.98 | 17.08 | a | 39.52 | ||||||||||
1993 | 22.97 | 20.96 | a | 31.66 | 40.03 | 49.03 | 56.73 | 60.86 | b | 58.37 | 52.27 | 43.93 | a | 27.36 | a | 22.70 | h | 42.20 | a | |||||||
1994 | ----- | z | 23.92 | b | 28.52 | a | 39.66 | a | 49.92 | a | 57.62 | 60.05 | 60.13 | 52.15 | 41.55 | 31.30 | 28.68 | 43.04 | a | |||||||
1995 | 22.78 | a | 34.41 | 35.34 | 38.36 | a | 45.15 | 53.98 | 57.56 | 61.08 | a | 52.79 | a | 41.83 | b | 37.32 | m | 23.69 | o | 44.33 | b | |||||
1996 | ----- | z | ----- | z | ----- | z | 39.71 | a | 52.26 | 57.30 | 61.50 | 58.68 | a | 50.45 | 40.82 | f | 33.66 | e | 26.17 | b | 47.47 | d | ||||
1997 | 19.43 | h | 22.65 | d | 32.87 | a | 34.69 | a | 48.03 | a | 54.30 | 59.84 | 59.28 | d | 55.15 | 40.48 | a | 29.76 | c | 19.67 | b | 41.52 | a | |||
1998 | 25.50 | b | 23.33 | a | 30.92 | 35.07 | a | 48.37 | a | 56.14 | a | 61.45 | 58.24 | b | 53.60 | a | 42.40 | b | 34.27 | 26.97 | a | 41.35 | ||||
1999 | 27.53 | 29.98 | 36.15 | a | 36.73 | 46.91 | c | 53.90 | a | 60.37 | 57.93 | a | 51.19 | a | 41.50 | a | 34.03 | a | 19.42 | 41.30 | ||||||
2000 | 27.27 | 31.36 | a | 33.85 | 41.57 | 51.69 | 57.58 | 61.31 | 60.50 | 53.92 | 42.95 | a | 26.42 | 25.00 | 42.78 | |||||||||||
2001 | 17.63 | a | 26.11 | 32.07 | a | 41.69 | a | 49.21 | 56.95 | 62.35 | 58.90 | a | 52.18 | b | 43.24 | 33.97 | 21.85 | 41.35 | ||||||||
2002 | 19.68 | 20.46 | 30.44 | 44.38 | 47.65 | 59.30 | 60.53 | a | 60.34 | b | 52.93 | 40.48 | 31.50 | 18.52 | 40.52 | |||||||||||
2003 | 24.24 | 23.54 | 31.37 | 39.82 | 48.69 | 54.83 | 63.15 | 60.22 | a | 51.77 | 44.98 | 30.60 | a | 24.08 | a | 41.44 | ||||||||||
2004 | 22.45 | a | 17.05 | 37.52 | 38.43 | b | 48.94 | 55.05 | a | 58.50 | a | 56.37 | 51.00 | a | 41.23 | 30.72 | 21.19 | 39.87 | ||||||||
2005 | 28.53 | a | 26.55 | 29.55 | 38.43 | 47.89 | 54.43 | 60.48 | 57.28 | a | 53.28 | 43.27 | 32.98 | 24.47 | a | 41.43 | ||||||||||
2006 | 23.37 | 26.38 | 32.52 | 41.34 | b | 49.47 | 57.93 | 60.73 | g | 59.73 | 48.43 | a | 41.33 | a | 33.02 | 15.52 | 39.00 | a | ||||||||
2007 | 9.89 | 22.89 | 32.30 | a | 37.97 | a | 46.74 | 55.00 | 59.63 | 60.85 | 53.18 | 42.23 | 32.65 | 19.39 | 39.39 | |||||||||||
2008 | 14.21 | b | 23.40 | 29.98 | a | 37.40 | 46.42 | 56.09 | b | 60.05 | 58.95 | b | 50.06 | f | 42.13 | 32.78 | 24.50 | 38.72 | a | |||||||
2009 | 20.06 | 27.27 | 33.81 | b | 37.28 | 51.18 | 53.18 | 61.37 | 57.56 | 51.45 | 39.66 | 32.57 | a | 16.42 | 40.15 | |||||||||||
2010 | 18.00 | a | 15.86 | 23.57 | a | 39.57 | a | 47.06 | 57.70 | 61.35 | 60.16 | 54.78 | 44.35 | 28.72 | 30.92 | 40.17 | ||||||||||
2011 | 20.13 | a | 20.17 | a | 36.29 | 41.29 | a | 45.18 | 58.07 | 63.39 | 62.31 | 52.80 | 42.15 | 30.78 | 15.60 | 40.68 | ||||||||||
2012 | 23.70 | a | 25.86 | 34.05 | 42.83 | 48.53 | 59.35 | 61.66 | 60.74 | 53.10 | 43.39 | 34.13 | 17.60 | 42.08 | ||||||||||||
2013 | 8.45 | 18.82 | 31.79 | 37.84 | a | 46.31 | 58.88 | 61.52 | 60.06 | 54.72 | 39.45 | 30.22 | 19.24 | 38.94 | ||||||||||||
2014 | 24.55 | 31.46 | 32.95 | 37.20 | 44.84 | 55.97 | 61.31 | 56.89 | 55.97 | 44.94 | 27.82 | 24.40 | 41.52 | |||||||||||||
2015 | 24.37 | 27.45 | 33.76 | 39.87 | 45.50 | 57.78 | 60.31 | 58.97 | 55.52 | 46.48 | 31.25 | 23.92 | 42.10 | |||||||||||||
2016 | 17.42 | 27.03 | 35.71 | 38.58 | 45.02 | 55.66 | n | 65.11 | v | 59.05 | k | ----- | z | ----- | z | ----- | z | ----- | z | 32.75 | g | |||||
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.06 | e | 21.24 | 23.15 | j | |
2019 | 20.52 | a | 25.45 | 35.44 | 41.97 | a | 44.65 | 54.62 | 60.56 | 61.03 | 55.72 | 40.16 | 32.85 | 21.05 | 41.17 | |||||||||||
2020 | 21.95 | 25.59 | 36.68 | 41.52 | 51.85 | a | 58.95 | 63.19 | 61.65 | 52.41 | a | 45.58 | 35.80 | b | 20.68 | 42.99 | ||||||||||
2021 | 19.63 | 25.25 | 32.09 | b | 40.50 | d | 49.44 | 57.88 | 61.13 | a | 59.45 | 55.26 | a | 43.03 | a | 36.79 | a | 30.58 | a | 42.59 | ||||||
2022 | 20.82 | 17.12 | p | 30.07 | b | 43.32 | 51.98 | 59.88 | 62.11 | h | 57.75 | e | 55.59 | b | 42.89 | 29.26 | a | 26.89 | 41.84 | b | ||||||
2023 | 21.40 | a | 23.80 | a | 32.08 | 39.88 | 49.65 | 54.41 | a | 64.66 | b | 62.10 | 54.65 | 44.14 | c | 33.85 | 21.73 | a | 41.86 | |||||||
2024 | 21.16 | 27.98 | 34.40 | 39.97 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.85 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.51 | 23.94 | 31.21 | 39.32 | 47.16 | 55.27 | 59.96 | 58.47 | 52.15 | 42.38 | 30.86 | 21.98 | 40.39 | |||||||||||||
S.D. | 4.81 | 4.58 | 3.89 | 2.80 | 2.29 | 2.13 | 1.79 | 1.92 | 2.13 | 2.03 | 3.40 | 4.50 | 1.31 | |||||||||||||
SKEW | -0.13 | -0.05 | -0.75 | -0.49 | 0.07 | 0.32 | -0.46 | -0.22 | -0.20 | -0.21 | -0.65 | -0.17 | 0.00 | |||||||||||||
MAX | 28.53 | 34.41 | 37.52 | 45.93 | 52.26 | 59.88 | 64.66 | 62.53 | 57.78 | 47.19 | 37.05 | 32.50 | 42.99 | |||||||||||||
MIN | 8.45 | 13.75 | 20.17 | 31.53 | 41.15 | 51.11 | 53.39 | 52.19 | 44.70 | 36.45 | 21.50 | 9.27 | 37.18 | |||||||||||||
YRS | 80 | 82 | 83 | 83 | 86 | 90 | 84 | 89 | 87 | 88 | 85 | 82 | 56 |