YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 47.87 | p | 45.20 | 36.16 | 23.53 | 21.29 | 31.55 | h | ||||
1934 | 17.55 | 23.18 | 25.70 | a | 30.57 | 36.35 | 36.37 | 48.74 | 50.00 | 40.00 | 31.94 | 23.47 | 20.48 | 32.03 | ||||||||||||
1935 | 19.97 | 21.11 | 24.10 | 28.97 | a | 31.77 | 39.40 | 47.10 | a | 50.42 | 39.27 | 30.84 | 22.50 | 18.16 | 31.13 | |||||||||||
1936 | 16.29 | 19.59 | 21.65 | 29.93 | 35.10 | 41.77 | 46.58 | 48.13 | 41.70 | 31.35 | 34.04 | d | 20.44 | d | 32.21 | |||||||||||
1937 | 8.29 | c | 14.78 | a | 28.21 | l | 28.90 | a | 34.39 | 37.70 | 43.84 | 50.48 | f | 49.54 | d | 33.17 | a | 20.93 | 20.42 | 29.19 | b | |||||
1938 | 20.13 | 21.20 | c | 24.42 | 27.20 | 32.29 | 38.63 | ----- | z | ----- | z | 37.18 | s | 31.32 | 16.57 | 18.23 | 25.55 | c | ||||||||
1939 | 14.13 | 8.39 | 21.19 | 30.15 | d | 30.97 | a | 39.24 | e | 47.26 | 48.65 | 43.73 | ----- | z | ----- | z | ----- | z | 31.52 | c | ||||||
1940 | 15.50 | a | 21.97 | 25.42 | 27.13 | g | 33.58 | 42.93 | 49.29 | 47.96 | f | 45.53 | 36.42 | 23.37 | 24.65 | 31.87 | b | |||||||||
1941 | 18.40 | a | 26.61 | 27.43 | a | 27.83 | 37.19 | 41.00 | 47.87 | 49.71 | 43.30 | 31.83 | s | 26.90 | 23.10 | 33.58 | a | |||||||||
1942 | 19.35 | 18.32 | 23.55 | 30.20 | 36.35 | 43.13 | 50.55 | 49.90 | a | 43.50 | 35.87 | 29.43 | 25.16 | 33.78 | ||||||||||||
1943 | 21.71 | 24.82 | 29.23 | 34.73 | 37.97 | 45.00 | 52.71 | 53.19 | 46.37 | 34.90 | 25.27 | 21.52 | 35.62 | |||||||||||||
1944 | 17.48 | 20.48 | 19.71 | 25.00 | a | 31.90 | 37.93 | 47.16 | 47.35 | 40.50 | 34.97 | 20.10 | 18.23 | 30.07 | ||||||||||||
1945 | 13.26 | 21.86 | 19.52 | 25.03 | 31.35 | 35.60 | 49.35 | 50.61 | 40.03 | 33.35 | 19.40 | 10.84 | 29.18 | |||||||||||||
1946 | 12.74 | 12.29 | 22.16 | 29.90 | 29.13 | 38.00 | a | 47.23 | 48.61 | 44.43 | 31.94 | 21.70 | 21.10 | 29.94 | ||||||||||||
1947 | 11.71 | 21.96 | 23.71 | 24.47 | 35.16 | 37.50 | 48.55 | 49.87 | 43.90 | 32.71 | 19.90 | 15.42 | 30.40 | |||||||||||||
1948 | 15.55 | 16.97 | 15.81 | 29.23 | 31.81 | 40.13 | 47.06 | 47.42 | 40.20 | 31.81 | 17.13 | 19.23 | 29.36 | |||||||||||||
1949 | 12.39 | 12.11 | 20.87 | 25.77 | 31.29 | 39.20 | 48.29 | 42.84 | 41.90 | 28.10 | 23.17 | 11.52 | 28.12 | |||||||||||||
1950 | 14.23 | 26.21 | n | 21.16 | 25.57 | 28.16 | 35.77 | 46.29 | 41.35 | 35.03 | 32.35 | 21.53 | 16.58 | 28.91 | a | |||||||||||
1951 | 14.13 | 16.04 | 18.32 | 24.50 | 27.27 | e | 35.14 | i | 46.77 | 47.74 | 37.83 | 32.88 | o | 22.52 | g | 16.55 | 27.68 | c | ||||||||
1952 | 19.58 | 16.69 | 17.39 | 28.24 | e | 31.65 | 37.03 | 44.74 | 48.00 | b | 42.93 | a | 31.72 | f | 20.21 | a | 17.07 | d | 29.41 | a | ||||||
1953 | 24.27 | a | 18.00 | b | 23.23 | 26.63 | 31.16 | 38.50 | 51.48 | 45.88 | f | 37.97 | 29.90 | 22.83 | 13.65 | 28.87 | a | |||||||||
1954 | 16.45 | 21.61 | 22.97 | 29.10 | 33.55 | ----- | z | 51.45 | 47.42 | 42.67 | 32.90 | 23.50 | 16.90 | a | 30.77 | a | ||||||||||
1955 | 7.61 | 10.43 | 21.68 | 24.27 | 31.58 | 39.20 | 46.71 | 50.94 | 38.67 | 32.19 | 24.43 | 19.70 | a | 28.95 | ||||||||||||
1956 | 20.48 | 8.66 | 21.13 | 28.62 | a | 33.16 | 43.60 | 47.00 | 44.16 | 40.90 | 30.87 | 16.57 | 14.16 | 29.11 | ||||||||||||
1957 | 21.58 | 25.85 | a | 25.23 | 26.57 | 33.68 | c | 42.40 | e | 50.87 | 50.10 | 40.73 | 35.87 | 22.30 | 22.45 | 33.14 | ||||||||||
1958 | 16.71 | 23.14 | 22.23 | 29.03 | 39.48 | 46.77 | 48.97 | 49.58 | 43.43 | 33.48 | 23.77 | 20.90 | a | 33.12 | ||||||||||||
1959 | 17.42 | 15.68 | 21.13 | 32.67 | 34.32 | 45.17 | 49.71 | 48.81 | 40.97 | 32.65 | 23.57 | 20.13 | 31.85 | |||||||||||||
1960 | 9.94 | 13.52 | 26.65 | 29.53 | 34.03 | 43.47 | 48.29 | 48.10 | 41.97 | 31.94 | 24.87 | 15.35 | 30.64 | |||||||||||||
1961 | 17.39 | 19.50 | 22.55 | 29.17 | 34.16 | 44.30 | 49.16 | 48.00 | 40.37 | 31.16 | 23.17 | 16.97 | 31.32 | |||||||||||||
1962 | 15.16 | 22.46 | 17.52 | 31.70 | 34.06 | 39.57 | 49.19 | 47.61 | 44.30 | 33.74 | 26.83 | 20.40 | a | 31.88 | ||||||||||||
1963 | 13.45 | 21.39 | 22.68 | 29.80 | 37.52 | 40.60 | 50.61 | 49.90 | 45.00 | 37.23 | 26.70 | 17.06 | 32.66 | |||||||||||||
1964 | 12.84 | 10.75 | a | 18.06 | 26.30 | 39.68 | 44.10 | a | 52.30 | a | 51.00 | a | 43.47 | 35.55 | 22.47 | 21.55 | 31.51 | |||||||||
1965 | 19.40 | a | 16.07 | 21.57 | a | 28.73 | 34.26 | 39.60 | 49.97 | 48.00 | 42.00 | 32.87 | 28.60 | 20.97 | a | 31.84 | ||||||||||
1966 | 10.55 | 13.46 | 23.37 | a | 30.54 | d | 38.06 | 43.97 | 52.26 | 48.30 | a | 42.97 | 31.06 | 27.43 | 17.84 | 31.65 | ||||||||||
1967 | 15.10 | 19.93 | 26.06 | 27.66 | a | 31.68 | 40.90 | 49.55 | 46.58 | 40.83 | 30.71 | 25.20 | 16.19 | 30.87 | ||||||||||||
1968 | 17.03 | 22.72 | 22.52 | 26.60 | 34.06 | 41.17 | 45.81 | 43.06 | 37.40 | 31.45 | 22.77 | 13.00 | 29.80 | |||||||||||||
1969 | 22.65 | 18.07 | 17.03 | 27.33 | 34.03 | 39.37 | 50.81 | 51.42 | 42.87 | 31.52 | 24.40 | 21.32 | 31.73 | |||||||||||||
1970 | 15.42 | 22.82 | 21.29 | 23.90 | 35.06 | 43.10 | 50.71 | 48.74 | 41.50 | 29.03 | 25.10 | 18.58 | 31.27 | |||||||||||||
1971 | 16.32 | 18.64 | 23.42 | 27.57 | 31.97 | 40.33 | 49.61 | 48.61 | 43.37 | 31.06 | 24.50 | 17.00 | 31.03 | |||||||||||||
1972 | 16.68 | 19.45 | 26.94 | 27.23 | 32.58 | 44.67 | 48.71 | 47.58 | 42.93 | 37.23 | 19.50 | 14.68 | 31.51 | |||||||||||||
1973 | 14.55 | b | 19.57 | 21.00 | 25.55 | a | 36.32 | 42.37 | 48.29 | 46.84 | 40.17 | 32.71 | 26.14 | a | 18.73 | a | 31.02 | |||||||||
1974 | 16.87 | 17.29 | 26.10 | 26.97 | 35.71 | 45.63 | 49.94 | 44.84 | 40.90 | 37.00 | 25.07 | 15.13 | 31.79 | |||||||||||||
1975 | 18.23 | a | 16.96 | 22.65 | 25.63 | 32.00 | 39.53 | 49.94 | 47.84 | 42.80 | 32.71 | 22.40 | 18.32 | 30.75 | ||||||||||||
1976 | 16.27 | a | 24.17 | 20.94 | 27.13 | 35.06 | 40.97 | 48.58 | 47.13 | 42.97 | 30.52 | 22.77 | 16.61 | 31.09 | ||||||||||||
1977 | 17.16 | 18.07 | 19.74 | 28.73 | 33.55 | 43.43 | 51.19 | 50.58 | 46.27 | 35.35 | 27.60 | 24.29 | 33.00 | |||||||||||||
1978 | 21.61 | 21.21 | 28.32 | 30.13 | 34.35 | 41.20 | 46.76 | b | 45.48 | 41.70 | 35.94 | 27.03 | 17.06 | 32.57 | ||||||||||||
1979 | 13.13 | 15.79 | d | 23.77 | 27.97 | 35.77 | 42.00 | 45.55 | 45.58 | 43.70 | 33.71 | 21.97 | 20.03 | b | 30.75 | |||||||||||
1980 | 22.94 | 22.86 | a | 23.10 | 28.13 | 33.07 | a | 42.20 | 49.60 | f | 47.52 | 41.17 | 30.10 | 23.43 | 23.26 | 30.71 | a | |||||||||
1981 | 22.13 | 20.21 | 22.32 | 31.87 | 35.74 | 44.73 | 51.03 | 48.16 | 42.77 | 32.58 | 25.30 | 20.58 | 33.12 | |||||||||||||
1982 | 19.20 | a | 22.04 | c | 25.03 | a | 28.50 | 33.81 | 38.00 | a | 47.61 | 49.94 | 43.90 | 28.69 | b | 30.32 | h | 17.97 | a | 32.24 | a | |||||
1983 | 17.31 | b | 19.46 | 23.87 | 24.83 | 31.94 | 37.73 | 49.00 | b | 50.40 | a | 45.97 | 34.68 | 24.93 | c | 22.52 | b | 31.89 | ||||||||
1984 | 18.00 | 15.69 | 22.33 | a | 26.75 | b | 37.68 | 43.27 | 52.17 | b | 49.67 | a | 43.83 | 30.93 | a | 23.52 | c | 20.38 | b | 32.02 | ||||||
1985 | 18.21 | b | 16.00 | 25.23 | a | 31.23 | 35.97 | 43.27 | 49.90 | 48.33 | g | 39.13 | 34.29 | 25.83 | 17.95 | i | 31.91 | b | ||||||||
1986 | 21.93 | a | 23.36 | c | 27.46 | c | 32.07 | c | 34.48 | b | 42.40 | 49.25 | o | 49.77 | a | 39.76 | a | 30.77 | 25.35 | d | 19.66 | b | 31.55 | a | ||
1987 | 16.10 | 20.96 | d | 20.67 | d | 29.65 | d | 34.59 | b | 41.83 | 46.46 | c | 47.97 | b | 39.72 | e | 36.13 | a | 23.68 | b | 15.83 | m | 32.52 | a | ||
1988 | 16.07 | d | 21.31 | p | 22.03 | a | ----- | z | 36.30 | a | 46.77 | 50.45 | 51.35 | 41.57 | 38.03 | 24.57 | 17.31 | b | 34.45 | b | ||||||
1989 | 14.42 | 22.21 | 26.94 | 33.67 | 38.48 | 44.07 | 51.27 | a | 47.87 | 42.73 | 33.03 | 24.60 | 16.97 | 33.02 | ||||||||||||
1990 | 15.00 | 17.43 | 25.32 | 32.00 | 35.63 | a | 49.00 | 50.71 | 47.29 | 46.43 | 33.68 | 25.93 | 15.58 | 32.83 | ||||||||||||
1991 | 18.32 | 23.61 | 19.68 | 26.87 | 35.30 | a | 42.60 | 50.07 | a | 50.07 | a | 43.90 | 36.83 | a | 24.23 | 21.10 | 32.71 | |||||||||
1992 | 14.10 | 24.07 | 27.06 | 32.03 | 39.81 | 43.57 | 49.39 | 48.68 | 44.83 | 37.48 | 19.72 | a | 17.74 | 33.21 | ||||||||||||
1993 | 23.45 | b | 23.11 | 25.39 | 30.10 | 38.77 | 44.87 | 49.61 | 50.97 | 42.70 | 35.10 | 24.37 | 20.40 | a | 34.07 | |||||||||||
1994 | 21.00 | 17.43 | 27.37 | a | 30.63 | 37.39 | 49.60 | 50.58 | 52.06 | 46.17 | 32.55 | 23.97 | 22.81 | 34.30 | ||||||||||||
1995 | 20.16 | 27.89 | a | 27.03 | 27.67 | 34.58 | 43.28 | a | 50.71 | 52.94 | 45.70 | 34.80 | a | 29.47 | 20.68 | 34.57 | ||||||||||
1996 | 20.74 | 27.66 | 24.35 | 30.28 | a | 40.00 | 48.93 | 53.19 | 50.84 | 43.43 | 34.55 | 27.33 | 21.81 | 35.26 | ||||||||||||
1997 | 18.74 | 19.96 | 25.10 | 30.27 | 41.00 | 44.90 | 50.20 | a | 51.68 | 49.03 | 33.90 | 27.97 | 16.94 | 34.14 | ||||||||||||
1998 | 22.23 | 19.54 | 23.70 | a | 26.90 | 36.55 | 43.83 | 53.48 | 52.10 | 48.63 | 35.42 | 28.43 | 21.19 | 34.33 | ||||||||||||
1999 | 22.19 | 23.04 | 26.16 | 27.27 | 36.23 | 45.33 | 52.03 | 51.58 | 45.97 | 36.13 | 29.80 | 18.03 | 34.48 | |||||||||||||
2000 | 22.48 | 24.44 | d | 25.67 | a | 32.83 | 42.87 | 48.97 | a | 53.45 | 51.55 | 47.07 | 38.17 | a | 21.30 | 22.45 | 35.94 | |||||||||
2001 | 18.13 | 20.39 | 25.94 | 32.57 | 40.97 | a | 48.47 | 53.32 | 51.33 | a | 46.53 | 38.06 | 29.33 | 18.68 | 35.31 | |||||||||||
2002 | 21.13 | 20.21 | 22.06 | 35.37 | 37.61 | 49.23 | 53.81 | 50.55 | 46.60 | 34.84 | 26.97 | 19.87 | 34.85 | |||||||||||||
2003 | 25.48 | 23.67 | a | 24.16 | 28.17 | a | 39.58 | 47.27 | 54.77 | a | 52.32 | 47.30 | 41.27 | a | 28.00 | a | 21.39 | 36.11 | ||||||||
2004 | 21.87 | 18.07 | 29.74 | 31.63 | 40.52 | 47.27 | 50.32 | 50.06 | 44.30 | 36.77 | 25.93 | 22.06 | 34.88 | |||||||||||||
2005 | 24.45 | 25.82 | 25.52 | 30.86 | a | 39.71 | 46.83 | 53.84 | 50.71 | 48.43 | 37.40 | a | 28.52 | a | 22.03 | 36.18 | ||||||||||
2006 | 19.84 | 23.61 | 25.06 | 32.10 | 41.26 | 48.87 | 54.90 | 52.26 | 42.27 | 35.29 | 28.70 | 19.03 | 35.27 | |||||||||||||
2007 | 15.23 | 20.25 | 26.29 | 29.83 | 39.61 | 47.60 | 53.13 | 54.23 | 47.90 | 36.23 | 30.50 | 16.35 | 34.76 | |||||||||||||
2008 | 15.69 | b | 21.45 | 25.42 | 29.43 | 36.58 | 47.77 | 52.81 | 52.00 | 45.23 | 34.16 | 29.20 | 21.23 | 34.25 | ||||||||||||
2009 | 20.74 | 19.50 | 26.48 | 27.40 | 41.68 | 45.00 | 53.39 | 50.00 | 44.27 | 33.13 | 26.87 | 14.65 | 33.59 | |||||||||||||
2010 | 18.06 | 20.18 | 22.42 | 28.50 | 34.26 | 45.77 | 53.06 | 53.58 | 47.67 | 37.48 | 22.87 | 26.45 | 34.19 | |||||||||||||
2011 | 15.19 | 16.14 | 26.67 | a | 30.40 | 35.00 | 45.10 | 53.35 | 53.77 | 47.40 | 35.84 | 25.93 | 16.61 | 33.45 | ||||||||||||
2012 | 20.35 | 21.52 | 24.06 | 32.37 | 39.23 | 47.73 | 52.87 | 53.55 | 46.63 | 35.71 | 27.97 | 18.03 | 35.00 | |||||||||||||
2013 | 11.00 | 16.29 | 27.29 | 30.40 | 37.58 | 48.60 | 53.68 | 52.32 | 46.73 | 32.23 | 28.33 | 19.39 | 33.65 | |||||||||||||
2014 | 21.61 | 24.00 | 26.52 | 29.53 | 37.10 | 46.90 | 52.90 | 49.55 | 48.20 | 37.81 | 26.57 | 22.55 | 35.27 | |||||||||||||
2015 | 22.42 | 26.25 | 28.45 | 30.47 | 36.48 | 49.53 | 52.77 | 53.26 | 48.20 | 39.74 | 24.93 | 17.55 | 35.84 | |||||||||||||
2016 | 16.58 | 22.00 | 27.42 | 30.93 | 37.29 | 50.10 | 53.39 | 50.29 | 45.63 | 39.19 | 28.80 | 22.94 | 35.38 | |||||||||||||
2017 | 22.77 | 27.18 | 29.39 | 31.17 | 38.16 | 49.43 | 53.52 | 51.39 | 46.43 | 37.77 | 34.03 | 22.39 | 36.97 | |||||||||||||
2018 | 22.77 | 23.75 | 27.68 | 33.10 | 39.55 | 49.50 | 53.77 | 51.97 | 47.43 | 36.55 | 24.07 | 21.29 | 35.95 | |||||||||||||
2019 | 19.42 | 19.39 | 27.03 | 32.10 | 34.45 | 45.93 | 52.39 | 52.81 | 47.27 | 33.29 | 27.67 | 21.00 | 34.40 | |||||||||||||
2020 | 20.94 | 21.38 | 28.97 | 31.97 | 40.87 | 49.03 | 53.87 | 54.16 | 45.13 | 36.74 | 29.40 | 19.06 | 35.96 | |||||||||||||
2021 | 19.74 | 19.68 | 24.10 | 32.23 | 38.03 | 49.20 | 53.29 | 52.16 | 47.90 | 34.65 | 29.00 | 25.06 | 35.42 | |||||||||||||
2022 | 18.06 | 16.82 | 24.58 | 31.43 | 38.90 | 49.23 | 53.84 | 52.55 | 47.43 | 35.42 | 22.43 | 22.74 | 34.45 | |||||||||||||
2023 | 17.10 | 16.68 | 24.84 | 29.60 | 38.97 | 42.93 | 55.13 | 53.77 | 47.30 | 37.48 | 29.13 | 22.58 | 34.63 | |||||||||||||
2024 | 18.94 | 22.17 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.55 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.79 | 19.90 | 23.90 | 29.16 | 35.65 | 43.51 | 50.37 | 49.66 | 43.71 | 34.17 | 24.99 | 19.31 | 32.95 | |||||||||||||
S.D. | 3.74 | 4.12 | 3.04 | 2.53 | 3.23 | 3.89 | 2.64 | 2.64 | 3.05 | 2.71 | 3.41 | 3.09 | 2.10 | |||||||||||||
SKEW | -0.35 | -0.57 | -0.38 | -0.03 | -0.06 | -0.08 | -0.23 | -0.64 | -0.26 | 0.08 | -0.04 | -0.29 | -0.20 | |||||||||||||
MAX | 25.48 | 27.89 | 29.74 | 35.37 | 42.87 | 50.10 | 55.13 | 54.23 | 49.54 | 41.27 | 34.04 | 26.45 | 36.97 | |||||||||||||
MIN | 7.61 | 8.39 | 15.81 | 23.90 | 27.27 | 35.60 | 43.84 | 41.35 | 35.03 | 28.10 | 16.57 | 10.84 | 28.12 | |||||||||||||
YRS | 91 | 89 | 89 | 88 | 90 | 88 | 87 | 85 | 90 | 87 | 88 | 88 | 74 |