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 | 63.65 | 60.74 | 54.50 | b | 40.03 | 31.55 | a | 19.73 | a | 45.03 | f | |||
1928 | 21.16 | 23.48 | 32.61 | 35.33 | 49.39 | 56.80 | 62.26 | 61.16 | 50.93 | 45.26 | 30.87 | 22.87 | a | 41.01 | ||||||||||||
1929 | 21.16 | 17.15 | b | 30.61 | 40.30 | 48.94 | 57.63 | 60.10 | 60.58 | 56.73 | 45.71 | 26.59 | a | 21.87 | a | 40.61 | ||||||||||
1930 | 14.90 | a | 28.79 | 28.03 | a | 44.00 | 48.42 | 60.67 | 62.26 | 62.71 | 55.27 | 47.39 | 33.57 | 20.45 | 42.20 | |||||||||||
1931 | 24.68 | 31.30 | a | 26.87 | a | 39.61 | b | 48.29 | 59.47 | 61.90 | 58.87 | 57.93 | 44.68 | 33.10 | 26.55 | 42.77 | ||||||||||
1932 | 21.60 | a | 34.10 | 28.19 | 41.10 | 51.35 | 58.87 | 63.65 | 63.23 | 54.53 | 41.87 | 28.90 | 18.80 | a | 42.18 | |||||||||||
1933 | 26.42 | 18.70 | a | 32.29 | 36.47 | 48.48 | 59.57 | 64.32 | 62.23 | 60.07 | 44.32 | 31.48 | a | 27.10 | 42.62 | |||||||||||
1934 | 19.83 | a | 21.54 | 30.07 | a | 43.83 | 52.65 | 60.90 | 64.42 | 64.87 | 52.37 | 44.32 | 32.67 | 24.16 | 42.64 | |||||||||||
1935 | 24.71 | 25.11 | 33.73 | a | 40.63 | 47.87 | a | 58.23 | 61.97 | 63.00 | 50.77 | 42.16 | 28.67 | 22.73 | a | 41.63 | ||||||||||
1936 | 18.52 | 18.07 | a | 32.07 | a | 35.79 | a | 52.77 | 59.47 | 62.19 | 59.13 | 57.17 | 39.55 | 24.43 | 25.30 | a | 40.37 | |||||||||
1937 | 15.67 | a | 22.64 | 27.07 | a | 38.20 | 51.80 | a | 58.50 | 62.06 | 62.90 | 55.63 | 42.26 | 28.00 | 22.48 | 40.60 | ||||||||||
1938 | 21.39 | 26.56 | a | 34.35 | 39.38 | a | 49.45 | 59.60 | 62.52 | 60.55 | 52.67 | 41.77 | 22.73 | 18.26 | 40.77 | |||||||||||
1939 | 22.87 | 14.79 | 27.35 | 36.07 | 48.48 | 57.13 | 60.87 | 58.39 | 51.60 | 37.35 | 22.77 | 18.71 | 38.03 | |||||||||||||
1940 | 15.68 | 22.07 | 26.65 | 36.63 | 49.03 | 55.60 | 61.52 | 58.23 | 52.17 | 40.35 | 25.87 | 23.57 | a | 38.95 | ||||||||||||
1941 | 20.52 | 25.82 | 28.10 | 39.30 | 51.35 | 56.50 | 60.65 | 59.71 | 54.30 | 45.23 | 28.30 | 24.84 | 41.22 | |||||||||||||
1942 | 18.48 | 19.75 | 26.74 | 40.37 | 46.13 | 58.60 | 60.32 | 60.00 | 51.17 | 41.77 | 28.70 | 23.77 | 39.65 | |||||||||||||
1943 | 18.55 | 22.18 | 24.94 | 40.83 | 45.74 | 59.60 | 61.48 | 62.23 | 52.40 | 37.23 | 22.63 | 21.23 | 39.09 | |||||||||||||
1944 | 18.97 | 26.07 | 27.06 | 35.40 | 48.90 | 59.47 | 61.65 | 61.23 | 52.13 | 40.81 | 30.63 | 21.42 | 40.31 | |||||||||||||
1945 | 19.94 | 24.54 | 30.97 | 33.97 | 47.48 | 54.20 | 60.90 | 61.19 | 51.33 | 40.29 | 26.43 | 18.16 | 39.12 | |||||||||||||
1946 | 18.26 | 21.11 | 30.19 | 41.97 | a | 46.39 | 58.50 | 61.84 | 62.32 | 55.75 | b | 44.87 | 26.73 | 25.00 | 41.08 | |||||||||||
1947 | 19.23 | 19.39 | 25.81 | 37.03 | 49.13 | 57.17 | 61.39 | 60.26 | 51.30 | 45.42 | 23.73 | 20.52 | 39.20 | |||||||||||||
1948 | 15.10 | b | 21.90 | 25.53 | a | 40.93 | 49.52 | 60.67 | 64.74 | 61.68 | 52.73 | 39.71 | 23.17 | 23.23 | 39.91 | |||||||||||
1949 | 16.61 | 26.61 | 30.23 | 39.77 | 51.29 | 59.13 | 63.74 | 59.97 | 54.60 | 41.10 | 29.97 | 20.23 | 41.10 | |||||||||||||
1950 | 21.48 | 23.50 | 24.26 | 37.60 | 48.65 | 61.27 | 63.16 | 59.55 | 54.67 | 44.77 | a | 26.33 | 17.87 | 40.26 | ||||||||||||
1951 | 18.77 | 22.61 | 27.90 | 35.50 | 50.23 | 58.23 | 65.13 | 64.16 | 53.67 | 42.00 | 26.67 | 23.06 | 40.66 | |||||||||||||
1952 | 23.94 | 23.10 | 26.87 | 39.40 | 49.94 | 64.27 | 63.32 | 65.55 | 51.97 | 36.45 | 26.90 | 21.10 | 41.07 | |||||||||||||
1953 | 25.81 | 22.79 | 34.81 | 37.77 | 47.71 | 64.63 | 65.26 | 62.65 | 50.77 | 42.97 | 30.47 | 20.29 | 42.16 | |||||||||||||
1954 | 22.06 | 28.18 | 29.13 | 44.07 | 49.45 | 61.37 | 65.00 | 63.65 | 56.63 | 45.26 | 29.00 | 22.16 | 43.00 | |||||||||||||
1955 | 24.00 | 17.64 | 28.13 | 39.17 | 50.71 | 56.90 | 63.81 | 61.90 | 55.70 | 41.77 | 25.79 | a | 24.71 | 40.85 | ||||||||||||
1956 | 23.00 | 19.69 | 29.58 | 37.77 | 54.23 | 63.40 | 64.10 | 60.81 | 54.63 | 45.10 | 25.20 | 23.25 | c | 41.73 | ||||||||||||
1957 | 22.65 | 33.32 | 32.90 | 39.37 | 50.68 | 59.87 | 65.77 | 63.39 | 52.00 | 44.58 | 30.03 | 24.74 | 43.27 | |||||||||||||
1958 | 22.03 | 26.21 | 28.74 | 39.30 | 53.55 | 62.37 | 65.35 | 63.87 | 57.63 | 44.03 | 30.30 | 20.45 | 42.82 | |||||||||||||
1959 | 18.16 | 23.89 | 27.10 | 40.97 | 52.39 | 61.77 | 62.81 | 63.94 | 54.93 | 39.52 | 24.47 | 25.45 | 41.28 | |||||||||||||
1960 | 19.90 | 19.07 | 28.10 | 41.87 | 46.74 | 61.40 | 63.39 | 62.97 | 55.37 | 43.77 | 30.17 | 22.77 | 41.29 | |||||||||||||
1961 | 16.35 | 25.14 | 31.16 | 37.90 | 50.26 | 59.53 | 61.74 | 60.94 | 51.97 | 39.74 | 30.13 | 22.84 | 40.64 | |||||||||||||
1962 | 15.94 | 26.64 | 26.71 | 42.23 | 53.39 | 59.13 | 64.06 | 61.03 | 56.90 | 44.29 | 32.93 | 25.23 | 42.37 | |||||||||||||
1963 | 11.87 | 24.79 | 32.61 | 44.97 | 52.58 | 60.20 | 65.55 | 63.29 | 57.03 | 47.10 | 31.87 | 20.03 | 42.66 | |||||||||||||
1964 | 18.71 | 19.45 | 28.26 | 40.63 | 53.29 | 59.33 | 65.39 | 62.45 | 55.90 | 42.74 | 33.07 | 25.52 | 42.06 | |||||||||||||
1965 | 25.26 | 21.46 | 25.00 | 44.30 | 53.65 | 61.10 | 65.77 | 61.77 | a | 53.83 | 41.13 | 36.30 | 25.45 | 42.92 | ||||||||||||
1966 | 13.90 | a | 20.61 | 31.00 | a | 40.75 | b | 50.16 | 61.13 | 67.90 | 62.00 | a | 56.03 | 36.61 | 31.43 | 17.23 | 40.73 | |||||||||
1967 | 17.97 | 19.96 | 34.58 | 44.53 | 45.45 | 59.07 | 61.90 | 58.00 | a | 52.50 | 37.55 | 29.10 | 18.77 | 39.95 | ||||||||||||
1968 | 24.13 | a | 23.10 | 31.70 | a | 38.87 | 48.61 | 58.27 | 63.30 | a | 62.32 | 50.31 | a | 43.16 | 31.60 | 22.52 | 41.49 | |||||||||
1969 | 23.70 | a | 25.39 | 25.68 | 43.50 | 52.00 | 56.23 | 65.35 | 63.29 | 57.00 | 41.52 | 29.03 | 24.94 | 42.30 | ||||||||||||
1970 | 18.55 | 26.07 | 27.32 | 36.97 | 47.29 | 57.07 | 64.26 | 61.10 | 55.10 | 37.74 | 27.67 | 22.94 | 40.17 | |||||||||||||
1971 | 20.39 | 19.93 | 25.97 | 38.30 | 46.65 | 59.07 | 63.19 | 59.39 | 52.90 | 42.29 | 32.30 | 26.16 | 40.54 | |||||||||||||
1972 | 18.87 | 21.38 | 33.68 | 42.50 | 49.48 | 58.57 | 61.58 | 58.87 | 55.27 | 42.48 | 25.87 | 19.81 | 40.70 | |||||||||||||
1973 | 20.19 | 23.89 | 32.29 | 34.53 | 46.35 | 55.93 | 60.97 | 58.45 | 53.13 | 42.39 | 30.70 | 19.61 | 39.87 | |||||||||||||
1974 | 20.94 | 20.64 | 35.06 | 40.87 | 52.26 | 57.53 | 60.97 | 59.35 | 49.83 | 44.65 | 31.10 | 22.23 | 41.29 | |||||||||||||
1975 | 22.58 | 23.64 | 27.03 | 37.30 | ----- | z | 56.67 | 60.71 | 59.39 | 49.33 | 38.06 | 26.77 | 22.16 | 38.51 | a | |||||||||||
1976 | 17.10 | 28.48 | 29.63 | a | 42.80 | 45.16 | 57.13 | 61.13 | 59.13 | 54.03 | 34.74 | 25.03 | 18.29 | 39.39 | ||||||||||||
1977 | 16.29 | 26.07 | 29.77 | 43.07 | 52.74 | 59.60 | 62.87 | 63.74 | 54.10 | 43.13 | 28.90 | a | 24.29 | 42.05 | ||||||||||||
1978 | 17.68 | 21.21 | 30.29 | 43.40 | 49.55 | 61.10 | 63.00 | a | 60.70 | a | 55.73 | 42.39 | 35.73 | 19.74 | 41.71 | |||||||||||
1979 | 16.23 | 22.61 | 31.52 | 40.47 | 48.29 | 56.83 | 61.77 | 58.68 | 53.00 | a | 41.23 | 26.80 | 22.55 | 40.00 | ||||||||||||
1980 | 23.45 | 24.38 | 27.87 | 36.33 | 49.06 | 62.30 | 65.87 | 62.32 | 57.73 | 39.97 | 27.93 | 26.07 | a | 41.94 | ||||||||||||
1981 | 24.84 | 24.04 | 34.52 | 44.13 | 49.19 | 59.63 | 65.26 | 61.84 | 54.53 | 44.48 | 32.77 | 25.00 | 43.35 | |||||||||||||
1982 | 21.71 | 21.57 | 32.30 | a | 38.31 | a | 49.97 | a | 54.07 | b | 63.23 | 63.55 | 55.90 | 38.61 | 30.87 | 24.23 | 41.19 | |||||||||
1983 | 18.74 | 25.15 | a | 30.29 | 32.80 | 44.19 | 56.13 | 63.30 | a | 62.26 | 56.30 | 45.10 | b | 34.07 | 15.10 | a | 40.29 | |||||||||
1984 | 18.00 | a | 19.54 | a | 27.82 | c | 36.04 | b | 49.72 | b | 60.50 | b | 61.77 | a | 61.00 | a | 50.14 | a | 42.20 | a | 31.21 | b | 26.47 | a | 40.37 | |
1985 | 19.13 | 21.21 | 32.29 | 42.07 | a | 48.00 | a | 58.31 | a | 59.10 | b | 61.58 | 54.38 | a | 41.68 | 26.93 | a | 15.37 | a | 40.00 | ||||||
1986 | 18.68 | 24.71 | 30.94 | 41.07 | a | 45.94 | 59.00 | 62.87 | a | 61.17 | b | 55.67 | 42.55 | b | 28.13 | 21.31 | b | 41.00 | ||||||||
1987 | 19.17 | a | 25.74 | a | 25.80 | a | 34.03 | 49.71 | 58.40 | 62.90 | 60.97 | a | 52.33 | 39.29 | 26.39 | b | 17.40 | a | 39.34 | |||||||
1988 | 16.19 | 20.46 | a | 25.69 | b | 34.52 | a | 46.35 | 57.40 | 61.55 | 61.47 | a | 50.25 | b | 39.17 | b | 27.17 | a | 18.10 | a | 38.19 | |||||
1989 | 20.23 | a | 20.86 | 30.71 | 40.45 | a | 52.48 | 58.20 | 60.53 | a | 61.70 | a | 50.53 | 37.65 | 24.30 | 14.87 | 39.38 | |||||||||
1990 | 17.74 | 21.93 | a | 31.10 | 40.52 | a | 46.23 | 63.67 | 62.61 | 58.94 | 56.77 | 38.19 | 28.77 | 16.10 | 40.21 | |||||||||||
1991 | 19.80 | a | 22.44 | a | 31.29 | 38.47 | 49.44 | f | 58.08 | d | 62.03 | 61.45 | 52.27 | 37.55 | 27.87 | 25.83 | a | 39.73 | a | |||||||
1992 | 22.94 | 29.28 | 31.13 | 42.27 | 48.55 | b | 56.13 | 61.17 | a | 59.11 | d | 53.29 | b | 39.60 | a | 25.57 | 22.87 | 40.99 | ||||||||
1993 | 23.04 | c | 23.61 | e | 30.80 | k | 38.17 | 49.26 | 58.93 | 65.65 | 61.97 | 50.59 | a | 38.87 | 23.67 | 20.29 | 41.28 | a | ||||||||
1994 | 19.52 | 19.68 | 30.90 | 37.77 | 51.65 | 61.30 | 62.42 | 61.68 | 52.60 | 41.71 | 32.30 | 24.00 | 41.29 | |||||||||||||
1995 | 23.48 | 26.63 | a | 30.94 | 36.60 | 48.42 | 56.70 | 61.29 | 63.77 | 54.40 | 37.97 | 29.87 | 23.35 | 41.12 | ||||||||||||
1996 | 18.26 | 25.93 | a | 26.00 | 37.40 | 54.50 | a | 61.30 | 64.43 | c | 63.29 | 52.80 | 40.30 | a | 29.07 | 20.35 | 41.14 | |||||||||
1997 | 21.10 | 24.57 | 30.77 | 36.00 | 49.93 | a | 58.17 | 63.80 | a | 61.87 | 57.30 | 41.71 | 27.93 | 20.65 | 41.15 | |||||||||||
1998 | 22.81 | 28.96 | c | 27.90 | 36.93 | c | 49.90 | a | 58.77 | 65.10 | 62.37 | a | 57.97 | 47.39 | 33.83 | a | 24.00 | 42.99 | ||||||||
1999 | ----- | z | 27.22 | a | 32.28 | b | 40.34 | a | 47.62 | b | 59.17 | 63.65 | 62.69 | b | 53.67 | 38.94 | 29.50 | 22.81 | 43.44 | a | ||||||
2000 | 22.59 | b | 28.10 | 32.71 | 39.90 | a | 51.11 | d | 61.64 | e | 64.76 | b | 62.19 | e | 61.00 | q | ----- | z | ----- | z | ----- | z | 45.37 | d | ||
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.81 | 53.22 | c | 39.20 | a | 34.60 | e | 21.41 | b | 42.05 | g | |
2002 | 20.50 | c | 20.48 | c | 25.43 | a | 41.04 | d | 49.08 | e | 61.71 | f | 62.77 | 63.76 | b | 53.44 | c | 42.90 | 27.20 | 23.16 | 39.07 | a | ||||
2003 | 21.48 | 22.78 | a | 29.43 | a | 36.70 | 48.16 | 56.48 | e | 62.29 | 62.44 | d | 52.18 | b | 44.32 | 31.10 | a | 20.52 | 40.66 | |||||||
2004 | 22.94 | 22.62 | 36.90 | 42.14 | a | 52.32 | ----- | z | 61.81 | 58.00 | e | 52.53 | 42.39 | 30.90 | 20.39 | 40.27 | a | |||||||||
2005 | 24.74 | d | 28.58 | b | 28.90 | 36.63 | c | 48.85 | e | 58.31 | d | 60.68 | 60.06 | 56.04 | d | 42.13 | 25.76 | e | 18.77 | a | 40.79 | |||||
2006 | 20.45 | 20.20 | c | 31.29 | c | 42.16 | e | 49.78 | d | 60.03 | 63.40 | a | 62.12 | f | 51.85 | c | 42.65 | 28.33 | 23.48 | f | 41.01 | b | ||||
2007 | 18.42 | 22.32 | 33.71 | 34.48 | c | 49.10 | b | 56.23 | 59.83 | m | 63.19 | d | 57.60 | 40.97 | 26.77 | 22.94 | 38.70 | a | ||||||||
2008 | 17.93 | c | 22.21 | 27.81 | 34.30 | 47.32 | 59.13 | 62.19 | 60.35 | 51.10 | 46.06 | n | 26.67 | 20.06 | 39.01 | a | ||||||||||
2009 | 17.29 | 23.57 | 31.23 | 37.29 | b | 49.61 | 58.90 | 62.10 | 60.87 | 50.77 | 38.61 | 27.13 | 16.87 | 39.52 | ||||||||||||
2010 | 18.00 | 22.00 | 28.39 | 38.00 | 47.45 | 61.20 | 63.29 | 60.48 | 56.17 | 40.90 | 25.97 | 23.03 | 40.41 | |||||||||||||
2011 | 13.52 | j | 15.79 | 31.06 | 38.67 | 44.97 | 61.80 | 66.39 | 65.87 | 52.03 | 40.87 | 28.70 | 24.00 | 42.74 | a | |||||||||||
2012 | 20.06 | 24.14 | 32.71 | 42.50 | 48.68 | 60.63 | 63.61 | 62.06 | 52.47 | 39.35 | 28.97 | 20.74 | 41.33 | |||||||||||||
2013 | 20.87 | 20.82 | 28.03 | 33.23 | 47.13 | 60.53 | 61.55 | 61.42 | 55.23 | 37.45 | 25.73 | 19.26 | 39.27 | |||||||||||||
2014 | 15.16 | 22.68 | 25.32 | 36.27 | 45.94 | 61.00 | 64.58 | 59.74 | 57.57 | 41.00 | 23.60 | 23.71 | 39.71 | |||||||||||||
2015 | 21.19 | 23.18 | 28.52 | 37.00 | 46.19 | 59.60 | 63.19 | 60.61 | 58.00 | 46.13 | 27.63 | 23.90 | 41.26 | |||||||||||||
2016 | 20.65 | 22.86 | 31.84 | 38.63 | 45.90 | 57.87 | 63.87 | 59.42 | 55.20 | 43.16 | 33.13 | 20.00 | a | 41.04 | ||||||||||||
2017 | 22.90 | 26.93 | 33.06 | 40.97 | 44.42 | 59.43 | 61.71 | 60.74 | 53.67 | 40.94 | 31.77 | 19.74 | 41.36 | |||||||||||||
2018 | 13.87 | 22.61 | 31.32 | 33.67 | 52.10 | 61.73 | 62.48 | 60.90 | 54.70 | 44.23 | 24.93 | 21.23 | 40.31 | |||||||||||||
2019 | 19.90 | 21.46 | 28.77 | 38.20 | 46.13 | 56.60 | 62.81 | 63.39 | 59.93 | 36.42 | 25.43 | 24.77 | 40.32 | |||||||||||||
2020 | 22.16 | 21.14 | 35.32 | 35.60 | 47.97 | 60.40 | 64.71 | 62.65 | 47.43 | 36.32 | 32.43 | 18.13 | 40.36 | |||||||||||||
2021 | 19.16 | 16.46 | 27.74 | 36.57 | 50.74 | 59.87 | 61.58 | 60.39 | 54.53 | 39.42 | 26.67 | 24.06 | 39.77 | |||||||||||||
2022 | 14.13 | 11.57 | 23.90 | 37.00 | 48.19 | 61.90 | 65.45 | 62.55 | 54.63 | 42.55 | 26.87 | 21.94 | 39.22 | |||||||||||||
2023 | 22.39 | 23.18 | 29.13 | 34.40 | 50.52 | 57.10 | 65.29 | 64.06 | 57.70 | 42.26 | 31.63 | 24.94 | 41.88 | |||||||||||||
2024 | 18.19 | 27.62 | 32.11 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.97 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.96 | 23.16 | 29.70 | 38.92 | 49.21 | 59.16 | 63.03 | 61.49 | 54.03 | 41.51 | 28.68 | 21.84 | 40.90 | |||||||||||||
S.D. | 3.02 | 3.70 | 2.88 | 2.99 | 2.39 | 2.11 | 1.68 | 1.74 | 2.50 | 2.80 | 3.14 | 2.82 | 1.18 | |||||||||||||
SKEW | -0.17 | 0.12 | 0.12 | 0.06 | 0.13 | 0.12 | 0.29 | 0.00 | 0.05 | -0.09 | 0.15 | -0.38 | 0.02 | |||||||||||||
MAX | 26.42 | 34.10 | 36.90 | 44.97 | 54.50 | 64.63 | 67.90 | 65.87 | 60.07 | 47.39 | 36.30 | 27.10 | 43.35 | |||||||||||||
MIN | 11.87 | 11.57 | 23.90 | 32.80 | 44.19 | 54.07 | 59.10 | 58.00 | 47.43 | 34.74 | 22.63 | 14.87 | 38.03 | |||||||||||||
YRS | 94 | 96 | 95 | 95 | 93 | 93 | 95 | 96 | 96 | 95 | 96 | 95 | 84 |