YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1928 | 22.74 | 28.43 | a | 39.18 | c | 38.57 | 47.58 | 49.80 | 59.94 | 55.10 | 49.47 | 42.65 | 33.97 | 25.90 | 41.11 | |||||||||||
1929 | 14.29 | 15.68 | 37.06 | 37.28 | a | 46.23 | a | 51.03 | 55.45 | 57.90 | 46.63 | 41.96 | f | 26.59 | a | 30.39 | 38.05 | a | ||||||||
1930 | 6.06 | 36.64 | 39.50 | i | 44.23 | 45.58 | 50.52 | a | 57.77 | 58.33 | a | 50.60 | 40.40 | a | 32.53 | 26.90 | 40.87 | a | ||||||||
1931 | 31.26 | 30.18 | 36.39 | 42.03 | 52.37 | a | 51.80 | 57.81 | 56.03 | 49.40 | 39.41 | b | 29.28 | a | 24.39 | 41.69 | ||||||||||
1932 | 26.65 | 28.62 | 37.06 | 42.10 | 46.30 | a | 54.34 | a | ----- | z | 56.74 | 49.27 | 43.23 | 38.23 | 22.19 | 40.43 | a | |||||||||
1933 | 29.17 | a | 21.39 | 33.74 | 39.73 | 43.52 | 54.53 | 57.94 | 56.84 | 48.72 | a | 44.34 | b | 34.27 | 36.43 | a | 41.72 | |||||||||
1934 | 35.48 | 34.43 | 40.39 | 46.76 | a | 48.68 | 53.40 | 57.74 | 56.90 | 46.93 | a | 45.13 | 40.86 | a | 32.23 | a | 44.91 | |||||||||
1935 | 28.70 | a | 30.89 | 33.29 | 37.00 | 45.03 | 53.20 | 56.77 | 55.29 | 52.00 | 39.71 | 28.37 | 27.74 | 40.67 | ||||||||||||
1936 | 30.13 | a | 13.24 | 34.42 | 44.03 | 50.65 | 54.50 | 59.58 | 57.16 | 47.60 | 41.81 | 24.40 | 31.29 | 40.73 | ||||||||||||
1937 | 7.68 | 25.18 | 36.23 | a | 40.70 | 46.20 | a | 54.59 | a | 61.35 | 55.06 | 54.83 | 46.45 | 37.63 | 33.35 | 41.61 | ||||||||||
1938 | 30.10 | 31.18 | 37.05 | j | 44.43 | 48.23 | 55.48 | a | 62.61 | 54.94 | 55.20 | 42.10 | 29.83 | 29.61 | 43.97 | a | ||||||||||
1939 | 31.00 | 28.75 | 36.71 | 41.70 | 47.29 | 51.37 | 58.50 | a | 58.84 | 50.43 | 41.35 | 31.27 | 34.27 | a | 42.62 | |||||||||||
1940 | 27.60 | a | 35.10 | 43.63 | a | 45.67 | 51.55 | 57.03 | 60.52 | 59.52 | 54.87 | 47.06 | 30.00 | 28.61 | 45.10 | |||||||||||
1941 | 28.77 | 31.67 | a | 37.16 | 43.17 | 47.16 | 52.47 | 62.52 | 58.65 | 50.47 | 41.70 | a | 34.48 | a | 30.87 | 43.26 | ||||||||||
1942 | 17.52 | 30.43 | 36.13 | 44.03 | 47.03 | a | 51.70 | 60.97 | 59.00 | 52.80 | 42.77 | 33.10 | 31.06 | 42.21 | ||||||||||||
1943 | 19.16 | 30.25 | 32.65 | 43.33 | 44.45 | 51.27 | 57.90 | 56.23 | 52.04 | d | 44.65 | 34.10 | 28.87 | 41.24 | ||||||||||||
1944 | 27.00 | 32.52 | 36.24 | j | 42.37 | 47.48 | 53.07 | 59.48 | 56.81 | 54.40 | 44.45 | 33.62 | a | 28.16 | 43.58 | a | ||||||||||
1945 | 32.32 | 34.18 | 36.65 | 39.20 | 48.32 | 51.93 | 60.50 | a | 58.13 | 50.50 | 45.00 | 35.40 | 27.74 | 43.32 | ||||||||||||
1946 | 31.39 | 33.75 | 36.81 | 40.37 | 47.23 | 52.03 | 58.35 | 57.00 | 49.80 | 40.77 | 31.50 | 30.97 | 42.50 | |||||||||||||
1947 | 23.90 | 31.71 | 38.74 | 43.53 | 51.29 | 53.43 | 57.97 | a | 56.39 | 51.57 | 45.58 | 36.17 | 32.06 | 43.53 | ||||||||||||
1948 | 27.39 | 28.93 | 32.43 | c | 39.23 | 46.32 | 56.53 | 55.35 | 55.84 | 48.93 | 39.48 | 34.30 | 25.24 | b | 40.83 | |||||||||||
1949 | 8.84 | 26.54 | 35.23 | 43.79 | b | 51.00 | 52.83 | 57.61 | 56.94 | 52.00 | 37.42 | 38.67 | 30.13 | 40.92 | ||||||||||||
1950 | 8.32 | 26.11 | 35.10 | 39.27 | 45.90 | 53.63 | 59.87 | 58.00 | n | 52.87 | 44.13 | 35.80 | 35.65 | 39.69 | a | |||||||||||
1951 | 29.31 | b | 30.79 | 33.19 | 39.63 | 49.94 | 54.37 | 58.87 | 56.57 | a | 49.73 | 41.74 | 30.71 | m | ----- | z | 44.41 | b | ||||||||
1952 | ----- | z | ----- | z | 41.00 | x | 41.13 | 49.45 | 53.73 | 61.48 | 60.77 | 53.63 | 45.68 | 28.00 | 35.08 | r | 49.24 | d | ||||||||
1953 | ----- | z | ----- | z | ----- | z | 45.20 | y | 45.13 | 48.60 | 57.84 | 58.13 | 51.00 | 43.13 | 36.28 | a | 34.81 | 46.86 | d | |||||||
1954 | 27.26 | 33.96 | a | 32.13 | 39.97 | 46.06 | 45.72 | l | 54.25 | w | 54.77 | a | 48.44 | c | 37.93 | c | 39.85 | d | 29.39 | 38.98 | b | |||||
1955 | 28.69 | b | 28.44 | l | 31.84 | 38.07 | b | 44.87 | a | 53.10 | 57.90 | a | 55.42 | 50.46 | d | 43.00 | m | 27.25 | b | 27.54 | c | 41.51 | b | |||
1956 | 28.85 | e | 20.54 | c | 36.39 | c | 41.36 | e | 51.27 | a | 51.39 | b | 61.59 | i | 58.97 | a | 51.81 | c | ----- | z | 33.22 | c | 32.83 | a | 40.66 | b |
1957 | 14.30 | a | 30.00 | 37.10 | b | 43.07 | b | 52.16 | 55.41 | a | 57.30 | a | 55.90 | a | 53.74 | c | 41.85 | d | 32.86 | a | 33.60 | u | 43.06 | a | ||
1958 | ----- | z | ----- | z | 33.71 | 41.53 | 52.65 | 56.97 | 61.68 | 62.35 | 51.13 | 41.16 | 36.10 | 32.61 | 46.99 | b | ||||||||||
1959 | 28.68 | 33.68 | 38.00 | 42.03 | 45.61 | 53.80 | 58.00 | 56.13 | 50.97 | 43.29 | 28.10 | 29.39 | 42.31 | |||||||||||||
1960 | 18.81 | 31.69 | 35.48 | 42.66 | a | 46.68 | 53.43 | 61.19 | 56.23 | 49.60 | 42.71 | 36.43 | 26.68 | 41.80 | ||||||||||||
1961 | 32.61 | 40.04 | 40.39 | 42.20 | 47.38 | b | 56.63 | 61.29 | 60.90 | 47.53 | 40.39 | 26.87 | 31.61 | 43.99 | ||||||||||||
1962 | 24.97 | 31.57 | 35.03 | 44.13 | 45.87 | 52.40 | 58.23 | 56.68 | 50.73 | 43.03 | 39.10 | 33.39 | 42.93 | |||||||||||||
1963 | 21.26 | 33.61 | 37.84 | 41.23 | 47.58 | 55.63 | 56.39 | 57.48 | 53.73 | 44.55 | 38.33 | 29.06 | 43.06 | |||||||||||||
1964 | 34.68 | 32.83 | 35.90 | 40.63 | 46.26 | 53.57 | 56.81 | 54.29 | 48.57 | 39.29 | 35.97 | 25.61 | 42.03 | |||||||||||||
1965 | 31.74 | 35.82 | 31.35 | 44.30 | 46.39 | 52.97 | 58.81 | 58.52 | 47.33 | 44.10 | 38.43 | 29.93 | a | 43.31 | ||||||||||||
1966 | 32.48 | 33.21 | 36.13 | 40.24 | a | 47.06 | 52.23 | 54.67 | s | 54.79 | b | 51.25 | v | 41.14 | b | 37.23 | 35.87 | 41.04 | b | |||||||
1967 | 38.13 | 35.14 | 36.71 | 38.27 | 46.61 | 55.40 | 59.81 | 59.87 | 54.10 | 43.00 | 33.17 | 29.71 | 44.16 | |||||||||||||
1968 | 31.26 | 35.83 | 38.26 | 41.03 | 46.74 | 54.03 | 58.42 | 55.77 | 50.37 | 39.48 | 36.03 | 26.61 | 42.82 | |||||||||||||
1969 | 16.26 | 29.71 | 35.26 | 40.87 | 48.97 | 56.20 | 56.03 | 53.97 | 51.20 | 37.71 | 34.67 | 31.06 | 40.99 | |||||||||||||
1970 | 28.10 | 35.14 | 35.90 | 38.33 | 47.06 | 56.15 | c | 59.68 | 55.23 | 45.40 | 38.23 | 33.63 | 28.81 | 41.80 | ||||||||||||
1971 | 34.16 | 32.39 | 33.87 | 38.87 | 47.65 | 51.47 | 56.48 | 57.94 | 42.47 | 37.10 | b | 33.90 | 28.61 | 41.24 | ||||||||||||
1972 | 25.19 | 30.34 | 39.10 | a | 37.77 | 47.10 | 53.50 | 56.13 | 57.06 | 47.03 | 39.61 | 35.27 | 22.19 | 40.86 | ||||||||||||
1973 | 23.74 | 30.93 | 39.42 | 40.60 | 47.32 | 53.10 | 57.29 | 57.35 | 51.00 | 42.32 | 36.23 | 35.97 | 42.94 | |||||||||||||
1974 | 23.94 | 36.50 | 37.61 | 42.63 | 46.75 | c | 56.87 | 61.77 | 59.74 | 51.57 | 42.32 | 36.80 | 34.74 | 44.27 | ||||||||||||
1975 | 29.68 | 29.43 | 34.84 | 37.80 | 47.74 | 53.61 | b | 64.10 | 56.16 | 48.43 | 46.10 | 33.63 | 32.42 | 42.83 | ||||||||||||
1976 | 32.00 | 32.59 | 35.35 | 39.70 | 48.42 | 52.00 | 60.58 | 57.87 | 53.37 | 39.87 | 34.73 | 26.06 | 42.71 | |||||||||||||
1977 | 20.45 | 34.56 | a | 38.32 | 45.43 | 46.81 | 58.43 | 59.68 | 63.71 | 51.17 | 40.19 | 33.73 | 32.10 | a | 43.72 | |||||||||||
1978 | 28.67 | a | 34.61 | 40.10 | a | 42.93 | 47.71 | 55.47 | 61.39 | 58.39 | 50.33 | 38.06 | 24.50 | 22.19 | 42.03 | |||||||||||
1979 | 8.42 | 30.30 | a | 37.19 | 42.53 | 50.16 | 54.37 | 59.90 | 59.45 | 51.47 | 43.32 | 27.57 | 33.45 | 41.51 | ||||||||||||
1980 | 21.00 | 30.34 | 37.19 | 45.00 | 48.55 | 51.43 | 58.94 | 53.65 | 50.83 | 40.00 | 36.13 | 32.73 | a | 42.15 | ||||||||||||
1981 | 33.84 | 32.43 | 38.52 | 42.63 | 48.48 | 52.97 | 58.71 | 61.87 | 52.53 | 41.06 | 34.60 | 29.29 | 43.91 | |||||||||||||
1982 | 25.81 | 31.79 | 36.52 | b | 39.13 | 47.63 | a | 57.37 | 58.32 | 58.06 | 47.83 | 41.07 | a | 30.80 | 30.10 | 42.04 | ||||||||||
1983 | 34.39 | 36.32 | 40.26 | 40.63 | 49.57 | a | 52.23 | 56.48 | 59.87 | 46.10 | 39.77 | 37.20 | 17.63 | a | 42.54 | |||||||||||
1984 | 27.50 | a | 32.93 | 39.55 | 40.83 | a | 45.94 | 52.30 | 59.23 | 58.61 | 47.87 | 40.81 | 35.83 | a | 23.18 | c | 42.05 | |||||||||
1985 | 23.61 | 26.92 | b | 34.39 | 44.47 | 48.84 | 54.55 | a | 65.31 | b | 55.35 | 47.40 | 42.55 | 21.07 | a | 17.35 | 40.15 | |||||||||
1986 | 28.87 | a | 32.79 | 41.90 | 41.63 | 49.45 | 59.50 | 57.13 | 62.87 | 49.47 | 42.42 | 36.55 | a | 26.93 | b | 44.13 | ||||||||||
1987 | 24.86 | c | 32.82 | 39.35 | 45.60 | 51.17 | a | 56.63 | 58.68 | 57.32 | 53.47 | 40.71 | 36.57 | 28.32 | 43.79 | |||||||||||
1988 | 26.77 | 33.39 | a | 38.00 | a | 43.77 | 47.48 | 54.55 | a | 60.19 | 57.52 | 50.43 | 46.74 | 39.43 | 27.58 | 43.82 | ||||||||||
1989 | 33.29 | 19.75 | 36.65 | 45.17 | 48.32 | 56.40 | 58.63 | a | 57.97 | a | 50.20 | 43.10 | 38.47 | 29.23 | 43.10 | |||||||||||
1990 | 34.39 | 31.57 | 38.00 | 46.00 | 47.65 | 54.73 | 61.45 | 62.29 | 57.07 | 42.74 | 39.30 | 18.23 | 44.45 | |||||||||||||
1991 | 24.84 | 36.71 | 34.97 | 42.43 | 47.23 | 52.33 | 60.45 | 62.48 | 52.90 | 41.23 | 35.53 | 33.60 | a | 43.73 | ||||||||||||
1992 | 34.15 | e | 38.17 | 41.39 | c | 46.68 | b | 52.07 | c | 60.68 | b | 60.13 | 59.23 | 49.33 | 43.61 | 35.03 | 26.74 | 45.60 | ||||||||
1993 | 19.35 | 23.54 | 36.03 | a | 44.00 | a | 52.26 | 53.87 | 56.03 | 56.35 | 51.87 | 43.67 | a | 27.20 | 30.84 | 41.25 | ||||||||||
1994 | 35.26 | 30.89 | a | 39.23 | 46.67 | 51.66 | b | 54.93 | 63.23 | a | 59.77 | 56.47 | 43.97 | a | 36.10 | 31.45 | 45.80 | |||||||||
1995 | 28.83 | a | 36.50 | b | 36.10 | 41.97 | 49.48 | 53.17 | a | 61.10 | 56.26 | 54.69 | a | 41.25 | c | 38.33 | 30.23 | 43.99 | ||||||||
1996 | 27.03 | 24.96 | a | 36.81 | 44.13 | 45.57 | a | 52.97 | 62.13 | 58.60 | a | 51.10 | 43.50 | a | 32.57 | 27.23 | 42.22 | |||||||||
1997 | 27.58 | 34.00 | 39.93 | a | 41.27 | 51.35 | 52.69 | a | 58.29 | 60.29 | 51.20 | 39.48 | 33.90 | 31.33 | a | 43.44 | ||||||||||
1998 | 29.87 | 36.86 | 38.23 | 42.13 | 49.00 | 55.63 | 66.58 | 62.00 | 58.73 | 41.87 | 40.93 | 29.23 | a | 45.92 | ||||||||||||
1999 | 36.10 | 35.86 | 37.35 | 39.37 | 45.74 | 52.90 | 58.26 | 62.16 | 49.50 | 39.58 | 39.73 | 34.30 | a | 44.24 | ||||||||||||
2000 | 30.26 | 31.79 | 36.55 | 43.93 | 48.39 | 54.83 | 61.16 | 61.29 | 52.73 | 43.61 | 29.79 | a | 27.65 | 43.50 | ||||||||||||
2001 | 30.10 | 30.82 | 37.77 | 42.24 | a | 50.94 | 53.90 | a | 62.32 | 64.61 | 57.72 | a | 44.10 | b | 36.87 | 33.40 | a | 45.40 | ||||||||
2002 | 32.89 | c | 31.76 | c | 38.13 | a | 43.79 | a | 48.26 | 57.83 | 65.21 | b | 60.94 | 54.50 | 40.61 | 34.70 | 35.13 | 45.31 | ||||||||
2003 | 35.90 | 33.29 | 43.71 | 42.83 | 50.23 | 57.70 | 65.90 | 62.65 | 55.83 | a | 47.03 | b | 30.36 | h | 31.03 | 47.83 | a | |||||||||
2004 | 23.77 | 33.04 | a | 40.13 | 43.50 | 50.74 | 54.97 | 64.10 | 64.06 | 54.07 | 46.65 | 35.67 | 31.83 | a | 45.21 | |||||||||||
2005 | 27.27 | a | 28.07 | 40.68 | 44.00 | 51.68 | 53.59 | a | 62.87 | 61.48 | 52.97 | 45.00 | a | 33.77 | 24.23 | 43.80 | ||||||||||
2006 | 36.77 | 28.00 | 36.84 | 43.30 | 49.65 | 56.87 | 64.87 | 60.90 | 53.80 | 42.61 | 35.50 | 26.74 | 44.65 | |||||||||||||
2007 | 25.10 | 33.14 | 39.30 | a | 42.53 | 48.55 | 54.71 | b | 64.48 | 59.84 | 52.33 | 41.60 | a | 33.83 | a | 31.13 | 43.88 | |||||||||
2008 | 24.19 | 33.38 | 36.68 | 38.90 | 48.53 | a | 51.77 | 60.87 | 60.42 | 51.83 | 42.16 | 37.20 | 22.23 | a | 42.35 | |||||||||||
2009 | 27.68 | 30.04 | 33.37 | a | 41.93 | b | 46.40 | a | 57.13 | 62.87 | a | 62.71 | 54.30 | 41.43 | a | 37.18 | b | 22.27 | a | 43.11 | ||||||
2010 | 35.41 | d | 35.20 | c | 37.27 | a | 41.10 | 46.90 | 54.40 | 61.61 | 60.74 | 55.40 | 45.45 | 33.73 | 30.16 | 44.78 | ||||||||||
2011 | 30.52 | 29.57 | 38.03 | 37.63 | 45.71 | 52.97 | 59.23 | 62.52 | 55.93 | 46.84 | 34.43 | 27.84 | 43.43 | |||||||||||||
2012 | 28.00 | 31.69 | 37.42 | 44.20 | 48.03 | 53.27 | 60.90 | 61.97 | 54.60 | 44.32 | 36.83 | 32.77 | 44.50 | |||||||||||||
2013 | 27.23 | 34.39 | 38.68 | 43.79 | a | 50.61 | 56.31 | a | 64.63 | a | 63.87 | 57.80 | 41.26 | 33.60 | 22.65 | 44.57 | ||||||||||
2014 | 30.29 | 29.96 | 39.10 | 43.23 | 51.77 | 56.03 | 66.77 | 64.45 | 54.73 | 50.97 | 32.53 | 32.71 | 46.05 | |||||||||||||
2015 | 30.87 | 36.89 | 42.32 | 42.03 | 53.23 | 62.83 | 66.45 | 64.23 | 53.63 | 49.29 | 34.33 | 32.32 | 47.37 | |||||||||||||
2016 | 29.90 | 36.52 | 39.94 | 47.73 | 52.48 | 57.57 | 62.29 | 62.52 | 54.80 | 47.03 | 42.00 | 24.97 | 46.48 | |||||||||||||
2017 | 17.48 | 27.82 | 40.39 | 43.20 | 51.00 | 57.37 | 65.35 | 65.16 | 55.17 | 43.13 | 37.93 | 27.77 | a | 44.31 | ||||||||||||
2018 | 35.39 | 34.32 | 37.61 | 43.47 | 55.50 | a | 56.13 | 64.58 | 62.97 | 52.77 | 44.32 | 33.03 | 33.84 | 46.16 | ||||||||||||
2019 | 32.23 | 22.11 | 30.52 | 45.93 | 51.74 | 56.43 | 61.35 | 63.65 | 55.67 | 39.90 | a | 31.20 | 29.71 | 43.37 | ||||||||||||
2020 | 34.42 | 33.34 | 37.55 | 44.13 | 50.58 | 56.60 | 62.55 | 63.42 | 55.50 | 45.61 | 35.63 | 30.29 | 45.80 | |||||||||||||
2021 | 34.94 | 30.79 | 37.65 | 42.63 | 50.65 | 61.93 | 67.42 | 63.10 | 55.00 | 44.90 | 40.63 | 29.84 | 46.62 | |||||||||||||
2022 | 26.58 | 28.82 | 38.61 | 37.10 | 44.65 | 53.67 | 63.68 | 64.32 | 55.07 | 47.81 | 28.43 | 21.87 | 42.55 | |||||||||||||
2023 | 29.55 | 28.64 | 34.03 | 40.23 | 51.97 | 56.40 | 63.26 | 64.03 | 54.67 | 44.39 | 33.70 | 33.52 | 44.53 | |||||||||||||
2024 | 23.74 | 34.34 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.04 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.20 | 31.26 | 37.12 | 42.09 | 48.48 | 54.45 | 60.41 | 59.08 | 51.76 | 42.65 | 34.26 | 29.23 | 43.32 | |||||||||||||
S.D. | 6.89 | 4.57 | 2.61 | 2.45 | 2.40 | 2.47 | 2.91 | 3.04 | 3.04 | 2.71 | 3.98 | 4.14 | 1.62 | |||||||||||||
SKEW | -1.19 | -1.43 | -0.06 | -0.13 | 0.40 | 0.73 | 0.46 | 0.26 | -0.20 | 0.34 | -0.79 | -0.74 | 0.25 | |||||||||||||
MAX | 38.13 | 40.04 | 43.71 | 47.73 | 55.50 | 62.83 | 67.42 | 65.16 | 58.73 | 50.97 | 42.00 | 36.43 | 47.37 | |||||||||||||
MIN | 6.06 | 13.24 | 30.52 | 37.00 | 43.52 | 48.60 | 55.35 | 53.65 | 42.47 | 37.10 | 21.07 | 17.35 | 40.15 | |||||||||||||
YRS | 94 | 93 | 91 | 95 | 96 | 95 | 92 | 95 | 95 | 93 | 94 | 93 | 80 |