YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | 29.94 | ----- | z | 52.39 | 61.90 | 63.71 | 60.39 | 56.17 | a | 49.28 | b | 29.10 | a | 21.94 | 47.20 | c | ||||||
1951 | 21.35 | 26.00 | 29.52 | 38.63 | 50.68 | 58.53 | 66.61 | 64.94 | 55.13 | 42.83 | a | 28.60 | 26.76 | b | 42.47 | |||||||||||
1952 | 28.32 | 28.07 | a | 30.37 | a | 40.97 | 50.32 | 64.73 | 63.32 | 65.84 | 59.00 | 39.68 | 28.47 | 27.19 | 43.86 | |||||||||||
1953 | 32.48 | 27.36 | 36.58 | 39.80 | 48.84 | 65.40 | 65.13 | 62.74 | 54.40 | 45.27 | a | 33.80 | 24.58 | 44.70 | ||||||||||||
1954 | 23.68 | 30.68 | 29.94 | 46.10 | 49.23 | 59.90 | 64.16 | 64.32 | 60.77 | 45.10 | 31.57 | 24.32 | 44.15 | |||||||||||||
1955 | 22.68 | 20.04 | 28.37 | a | 39.10 | a | 51.30 | a | 56.33 | 62.68 | 61.84 | 57.17 | 43.68 | 26.03 | 26.06 | 41.27 | ||||||||||
1956 | 23.45 | 21.97 | 31.42 | 37.90 | 53.03 | 62.20 | 62.68 | 61.55 | 56.97 | 45.39 | 27.63 | 25.45 | 42.47 | |||||||||||||
1957 | 22.10 | 35.00 | 34.94 | 41.37 | 50.39 | 57.80 | 66.52 | 65.03 | 51.80 | 45.23 | a | 31.31 | a | 25.42 | 43.91 | |||||||||||
1958 | 23.55 | b | 26.86 | 27.97 | 38.87 | 52.71 | 59.37 | 65.26 | 63.74 | 58.63 | 45.48 | 32.37 | 23.68 | 43.21 | ||||||||||||
1959 | 18.93 | a | 26.25 | 29.35 | 40.24 | a | 53.33 | a | 61.33 | 61.19 | 63.58 | 54.87 | 41.29 | 28.37 | 28.94 | 42.31 | ||||||||||
1960 | 21.97 | 23.07 | 29.52 | 44.90 | 47.87 | 59.57 | 62.23 | 63.80 | f | 54.90 | 44.84 | 34.00 | 26.13 | a | 40.82 | a | ||||||||||
1961 | 19.10 | 27.57 | 34.32 | 40.48 | a | 51.77 | a | 61.58 | d | 62.48 | 61.48 | 54.10 | a | 43.80 | a | 31.47 | 24.71 | 42.74 | ||||||||
1962 | 18.97 | a | 29.64 | 30.23 | 42.53 | 55.61 | 59.33 | 65.00 | 61.97 | 57.69 | a | 45.97 | 35.41 | a | 27.23 | 44.13 | ||||||||||
1963 | 13.39 | 27.14 | 35.70 | a | 46.28 | e | 54.00 | c | 60.33 | 66.55 | 63.77 | 59.10 | 49.00 | 34.90 | 21.48 | 44.30 | ||||||||||
1964 | 24.06 | 21.90 | 29.71 | 42.17 | 53.35 | 59.53 | ----- | z | 65.26 | 57.27 | 44.81 | 35.17 | 26.26 | 41.77 | a | |||||||||||
1965 | 28.29 | 23.75 | 26.16 | 44.83 | a | 52.16 | 58.80 | 64.68 | 61.94 | 54.80 | 43.23 | 39.50 | 28.86 | c | 43.92 | |||||||||||
1966 | 17.29 | 23.00 | 35.06 | 41.77 | 51.32 | 60.90 | 67.71 | 62.19 | 57.90 | 42.48 | 37.60 | 22.45 | 43.31 | |||||||||||||
1967 | 25.58 | 26.43 | 39.26 | 47.47 | 48.84 | 61.43 | 64.87 | 62.00 | 55.30 | 45.74 | ----- | z | 24.87 | 45.62 | a | |||||||||||
1968 | 27.48 | 25.72 | 35.65 | 40.37 | 50.52 | 60.13 | 63.97 | 63.23 | 54.10 | 46.52 | 33.87 | 23.71 | 43.77 | |||||||||||||
1969 | 28.62 | b | 28.96 | 27.00 | c | 45.11 | c | 53.90 | b | 59.13 | 67.68 | 66.18 | c | 60.63 | 43.10 | a | 33.33 | 27.04 | c | 45.06 | ||||||
1970 | 20.84 | f | 30.42 | b | 30.71 | 39.93 | 52.55 | 59.73 | 66.32 | 64.84 | 57.03 | 42.20 | a | 32.73 | 29.48 | 46.00 | a | |||||||||
1971 | 23.71 | c | 27.00 | a | 33.39 | 42.60 | 49.46 | c | 63.24 | a | 67.22 | h | 61.16 | 55.70 | 45.94 | 36.40 | 29.97 | 42.60 | a | |||||||
1972 | 22.56 | d | 26.93 | 37.81 | 45.13 | 51.40 | a | 61.40 | 63.68 | 62.06 | 57.97 | a | 46.27 | a | 29.63 | 23.06 | 43.99 | |||||||||
1973 | 23.42 | 28.22 | a | 36.26 | 38.40 | 49.87 | 58.93 | 64.03 | a | 63.53 | a | 56.17 | 46.77 | 35.67 | 24.32 | 43.80 | ||||||||||
1974 | 21.71 | 26.89 | 38.48 | 45.17 | 55.45 | 60.50 | 65.68 | 61.68 | 52.00 | 47.16 | 34.45 | a | 24.84 | 44.50 | ||||||||||||
1975 | 24.94 | 25.93 | 31.58 | 41.40 | 49.84 | 60.20 | 63.06 | 63.71 | 52.87 | 43.90 | 31.37 | 26.55 | 42.95 | |||||||||||||
1976 | 21.77 | 33.66 | 34.55 | 45.18 | b | 47.73 | a | 60.00 | 63.77 | 63.81 | 57.23 | 39.58 | 28.00 | 23.81 | 43.26 | |||||||||||
1977 | 18.26 | 29.54 | 34.13 | 45.60 | 56.77 | 63.80 | 66.97 | b | 66.26 | 59.79 | a | 47.04 | h | 32.65 | d | 27.53 | a | 45.57 | a | |||||||
1978 | 18.90 | 22.29 | 34.27 | a | 44.61 | b | 51.84 | 63.93 | b | 68.39 | 63.77 | 59.00 | 47.27 | a | 37.07 | b | 22.20 | a | 44.46 | |||||||
1979 | 16.28 | b | 26.96 | 35.44 | f | 43.00 | c | 51.74 | 59.82 | b | 65.60 | f | 62.68 | 57.42 | d | 47.00 | b | 30.86 | b | 26.43 | a | 42.22 | b | |||
1980 | 25.80 | a | 27.38 | 31.37 | a | 40.00 | a | 51.19 | 65.80 | 70.26 | 67.70 | a | 60.50 | 44.71 | 30.90 | a | 30.45 | b | 45.50 | |||||||
1981 | 25.48 | 27.37 | a | 36.00 | 47.69 | a | 51.32 | 64.00 | 67.81 | 63.00 | 57.00 | 46.58 | 35.77 | 26.03 | 45.67 | |||||||||||
1982 | 22.36 | c | 23.59 | a | 31.39 | 41.25 | b | 51.97 | a | 58.90 | a | 64.57 | a | 65.17 | b | 57.87 | 42.52 | 32.13 | 25.59 | b | 43.11 | |||||
1983 | 21.87 | a | 25.86 | 33.52 | 36.63 | 46.94 | 57.13 | 67.06 | 67.84 | 60.43 | 49.71 | 37.90 | 25.06 | m | 45.90 | a | ||||||||||
1984 | 20.48 | f | 27.17 | 31.24 | b | 39.62 | a | 53.58 | 63.53 | 65.35 | 65.65 | 55.96 | b | 46.17 | a | 35.14 | a | 29.96 | c | 46.67 | a | |||||
1985 | 21.17 | b | 27.19 | b | 37.74 | 45.52 | a | 54.79 | b | 61.76 | a | 65.37 | a | 66.13 | 57.28 | a | 46.76 | b | 31.79 | a | 22.19 | 44.81 | ||||
1986 | 28.48 | 28.86 | 38.82 | c | 46.27 | 53.00 | 61.67 | 67.13 | 63.93 | a | 58.79 | b | 45.10 | 31.47 | 27.87 | 45.95 | ||||||||||
1987 | 23.03 | 32.14 | 32.68 | 41.00 | 53.35 | 61.43 | 65.16 | 63.94 | 56.50 | 44.72 | b | 33.36 | b | 23.43 | a | 44.23 | ||||||||||
1988 | 21.63 | a | 25.10 | 31.39 | 41.00 | a | 52.71 | 61.63 | 65.06 | 66.06 | 57.07 | b | 46.48 | 35.27 | 26.20 | a | 44.13 | |||||||||
1989 | 26.68 | 23.39 | 35.26 | 46.83 | 55.45 | b | 58.83 | a | 65.23 | a | 62.40 | a | 51.15 | c | 42.75 | c | 29.90 | a | 15.83 | a | 42.81 | |||||
1990 | 23.77 | 25.15 | b | 33.10 | b | 40.37 | 47.83 | a | 62.10 | a | 61.10 | 60.06 | 57.21 | b | 41.62 | b | 31.17 | a | 16.45 | b | 41.66 | |||||
1991 | 18.87 | a | 28.29 | 31.90 | a | 40.41 | a | 50.93 | b | 58.96 | e | 61.74 | d | 61.29 | 53.89 | c | 46.44 | d | 30.82 | b | 29.84 | 42.78 | ||||
1992 | 27.60 | a | 33.00 | b | 37.87 | 47.33 | 52.61 | 58.97 | 65.39 | 62.32 | c | 57.07 | b | 46.32 | 30.07 | 25.74 | 45.36 | |||||||||
1993 | 24.81 | 26.73 | b | 33.93 | b | 40.89 | b | 52.37 | a | 62.10 | a | 68.68 | 64.83 | a | 54.97 | a | 42.29 | 29.21 | a | 26.77 | a | 43.96 | ||||
1994 | 22.65 | 23.46 | 35.23 | a | 41.87 | 54.74 | 65.43 | 65.90 | a | 64.68 | 57.24 | a | 45.47 | a | 37.03 | 30.00 | a | 45.31 | ||||||||
1995 | 28.69 | b | 30.37 | a | 36.04 | e | 41.60 | 51.06 | 59.97 | 65.58 | 67.61 | 57.46 | b | 44.97 | 35.41 | a | 27.97 | a | 45.56 | |||||||
1996 | 22.06 | 27.96 | a | 29.80 | a | 42.89 | b | 58.38 | b | 63.34 | a | 67.45 | b | 65.39 | 55.86 | b | 43.79 | b | 35.14 | a | 28.47 | a | 45.04 | |||
1997 | 24.03 | 28.82 | 35.93 | a | 38.00 | 52.97 | a | 61.18 | b | 67.53 | a | 65.29 | 61.67 | 47.20 | a | 31.69 | a | 25.19 | 44.96 | |||||||
1998 | 29.10 | 32.43 | 32.68 | 39.96 | c | 56.89 | c | 63.39 | b | 69.47 | a | 65.39 | 61.48 | e | 50.57 | a | 38.93 | 27.87 | 47.35 | |||||||
1999 | 29.48 | 33.04 | 34.89 | d | 43.62 | a | 52.50 | a | 63.07 | b | 67.52 | b | 67.47 | a | 56.83 | a | 44.97 | b | 37.46 | b | 25.87 | 46.39 | ||||
2000 | 27.13 | a | 32.00 | a | 36.32 | 45.36 | b | 55.83 | a | 62.22 | c | 67.33 | a | 68.28 | b | 58.80 | 49.80 | a | 30.21 | b | 21.60 | a | 46.24 | |||
2001 | 23.55 | 28.39 | 34.87 | a | 48.10 | 54.37 | a | 63.62 | a | 70.55 | 65.94 | 56.76 | a | 45.48 | b | 40.24 | a | 27.81 | 46.64 | |||||||
2002 | 27.21 | b | 26.50 | b | 28.52 | f | 45.92 | f | 52.71 | c | 64.64 | b | 67.62 | b | 66.70 | a | 57.77 | d | 46.14 | b | 34.70 | t | 29.58 | s | 51.16 | d |
2003 | 27.38 | b | 24.84 | i | 35.19 | d | 45.44 | e | 54.93 | b | 60.28 | a | 69.21 | g | 66.89 | c | 55.37 | k | 51.04 | d | 34.30 | g | 26.62 | j | 48.73 | e |
2004 | 25.66 | b | 23.50 | e | 41.11 | c | 45.00 | f | 55.63 | d | 61.59 | c | 65.20 | k | 62.22 | d | 57.81 | c | 48.00 | d | 36.50 | d | 27.88 | e | 43.99 | b |
2005 | 28.68 | c | 32.59 | f | 32.46 | c | 40.16 | e | 52.68 | f | 61.89 | c | 64.72 | f | 64.00 | d | 59.73 | h | 44.47 | a | 32.17 | 21.60 | a | 40.68 | d | |
2006 | 25.20 | a | 22.11 | 34.81 | 44.28 | a | 54.87 | 61.86 | b | 66.97 | 64.90 | 51.97 | 44.39 | 31.62 | a | 22.60 | a | 43.80 | ||||||||
2007 | 18.19 | 22.86 | 38.00 | 35.53 | 50.27 | e | 59.56 | c | 63.23 | a | 65.47 | a | 58.13 | 44.13 | a | 31.46 | b | 23.07 | a | 42.49 | ||||||
2008 | 21.61 | 24.32 | a | 31.87 | 39.00 | 49.37 | a | 61.37 | 65.68 | 63.84 | 53.10 | 43.38 | b | 33.00 | d | 23.52 | 42.50 | |||||||||
2009 | 21.10 | 27.16 | i | 32.61 | 40.17 | a | 51.17 | a | 61.58 | d | 65.00 | d | 63.48 | 53.19 | d | 39.45 | b | 33.50 | f | 18.84 | 44.66 | b | ||||
2010 | 21.00 | c | 20.89 | a | 32.20 | a | 42.04 | b | 50.80 | a | 65.14 | a | 64.96 | h | 64.83 | b | 59.03 | a | 44.92 | e | 29.69 | a | 24.93 | b | 41.41 | a |
2011 | 18.48 | 15.37 | a | 33.74 | 42.20 | 49.00 | 67.00 | 71.19 | 71.47 | a | 55.00 | 45.39 | c | 32.03 | a | 24.97 | a | 43.82 | ||||||||
2012 | 25.30 | a | 26.68 | a | 38.65 | 45.71 | f | 55.45 | k | 64.20 | 68.16 | 65.71 | g | 56.17 | 41.61 | 32.67 | 22.77 | 41.80 | c | |||||||
2013 | 22.48 | 23.36 | 31.10 | a | 34.43 | 51.59 | b | 64.50 | b | 65.41 | b | 65.83 | a | 59.48 | a | 42.87 | 31.59 | a | 19.94 | 42.72 | ||||||
2014 | 18.39 | 21.89 | 27.57 | a | 39.07 | 50.90 | a | 62.30 | 64.84 | 64.68 | 57.50 | 45.58 | 27.00 | 26.58 | 42.19 | |||||||||||
2015 | 21.87 | a | 23.89 | 32.90 | b | 40.90 | 49.40 | a | 62.63 | 66.39 | 63.67 | a | 60.93 | a | 47.97 | 32.20 | 27.26 | 44.17 | ||||||||
2016 | 23.17 | a | 27.59 | 34.83 | a | 41.80 | 48.45 | 63.27 | 67.60 | a | 63.26 | 57.66 | a | 46.97 | 35.97 | 24.15 | d | 44.56 | ||||||||
2017 | 25.68 | 29.89 | 35.48 | 42.61 | b | 47.77 | 61.62 | a | 66.97 | 62.65 | 56.90 | 44.06 | 37.30 | 21.97 | 44.41 | |||||||||||
2018 | 19.04 | e | 24.00 | 34.19 | 36.80 | 57.26 | 65.20 | 67.16 | 64.97 | 57.77 | 44.16 | 27.96 | b | 23.94 | 43.54 | |||||||||||
2019 | 22.81 | 22.61 | 30.29 | 42.63 | 49.50 | a | 59.00 | 67.03 | a | 68.87 | 63.47 | 37.03 | 27.47 | 26.43 | a | 43.10 | ||||||||||
2020 | 24.44 | d | 22.00 | 36.23 | 37.68 | b | 51.53 | a | 61.24 | a | 66.55 | 65.06 | 53.17 | 40.77 | a | 33.35 | j | 24.00 | 43.88 | a | ||||||
2021 | 25.68 | 20.50 | t | 31.78 | v | 39.80 | y | 51.87 | 63.73 | 65.45 | 67.45 | 59.59 | a | 45.73 | a | 33.67 | 29.42 | 49.18 | c | |||||||
2022 | 17.90 | a | 18.15 | a | 29.21 | b | 40.47 | 51.42 | 66.19 | c | 70.90 | 68.37 | d | 60.45 | a | 46.84 | 29.09 | h | ----- | z | 46.99 | b | ||||
2023 | ----- | z | 24.41 | f | 34.81 | j | 39.72 | l | 53.27 | i | 61.17 | 67.52 | 67.40 | a | 59.97 | 45.84 | 33.90 | ----- | z | 55.96 | f | |||||
2024 | 20.50 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.50 | k |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.28 | 26.33 | 33.38 | 41.93 | 51.99 | 61.61 | 65.87 | 64.47 | 57.04 | 44.99 | 32.77 | 25.22 | 44.02 | |||||||||||||
S.D. | 3.66 | 3.74 | 3.24 | 3.10 | 2.51 | 2.27 | 2.24 | 2.21 | 2.56 | 2.59 | 3.25 | 3.03 | 1.30 | |||||||||||||
SKEW | -0.05 | -0.12 | -0.01 | 0.04 | 0.28 | 0.18 | 0.11 | 0.44 | -0.14 | -0.33 | 0.15 | -0.68 | 0.29 | |||||||||||||
MAX | 32.48 | 35.00 | 41.11 | 48.10 | 58.38 | 67.00 | 71.19 | 71.47 | 63.47 | 51.04 | 40.24 | 30.45 | 47.35 | |||||||||||||
MIN | 13.39 | 15.37 | 26.16 | 34.43 | 46.94 | 56.33 | 61.10 | 60.06 | 51.15 | 37.03 | 26.03 | 15.83 | 41.27 | |||||||||||||
YRS | 71 | 68 | 70 | 68 | 71 | 74 | 67 | 72 | 72 | 73 | 68 | 69 | 53 |