YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.90 | a | 50.65 | 45.83 | 40.93 | a | 34.75 | b | 26.14 | c | 41.37 | f | ||
1925 | 33.29 | 35.75 | 34.71 | 38.70 | 44.29 | 45.55 | a | 49.67 | a | 49.32 | 47.21 | a | 39.94 | 36.33 | 38.52 | 41.11 | ||||||||||
1926 | 32.81 | 35.82 | 37.87 | 41.27 | 43.45 | 46.77 | 48.16 | 48.97 | 44.37 | 42.87 | a | 39.57 | 30.65 | 41.05 | ||||||||||||
1927 | 30.74 | 31.68 | 32.19 | 34.97 | 39.61 | 47.97 | 48.68 | 49.97 | 47.20 | 40.74 | 36.68 | b | 28.48 | b | 39.08 | |||||||||||
1928 | 30.32 | 32.31 | 37.16 | 38.06 | n | 42.81 | 47.20 | 50.48 | 48.58 | 44.73 | 41.23 | 36.50 | 30.48 | 40.16 | a | |||||||||||
1929 | 24.23 | 24.93 | 33.77 | 33.93 | 40.87 | 46.03 | a | 46.61 | 47.65 | 45.23 | 42.07 | a | 33.83 | 34.58 | 37.81 | |||||||||||
1930 | 20.84 | 32.18 | 33.23 | 38.73 | 39.61 | 44.70 | 47.65 | 48.68 | 46.53 | 39.23 | 34.53 | 32.35 | 38.19 | |||||||||||||
1931 | 34.84 | 33.32 | 34.23 | 37.13 | 42.71 | 45.70 | 47.90 | 46.52 | 47.10 | 39.26 | 31.97 | 30.29 | 39.25 | |||||||||||||
1932 | 28.16 | 26.90 | 35.16 | 36.93 | 39.94 | 44.90 | 46.19 | 49.42 | 44.27 | 42.06 | 38.33 | 27.58 | 38.32 | |||||||||||||
1933 | 29.48 | 25.14 | 31.84 | 32.93 | 38.26 | 42.07 | 45.65 | 49.35 | 43.23 | 40.42 | 35.60 | 33.55 | 37.29 | |||||||||||||
1934 | 34.52 | 35.89 | 37.45 | 40.53 | 42.84 | 44.53 | 47.23 | 48.32 | 44.60 | 40.32 | 38.77 | 32.94 | 40.66 | |||||||||||||
1935 | 28.42 | 33.21 | 29.97 | 32.87 | 37.94 | 44.60 | 47.35 | 47.06 | 46.40 | 38.48 | 30.17 | 33.90 | 37.53 | |||||||||||||
1936 | 31.39 | 20.00 | 29.45 | 36.27 | 41.81 | 45.97 | 47.26 | 47.81 | 42.93 | 40.77 | 34.20 | 32.29 | 37.51 | |||||||||||||
1937 | 18.71 | 27.25 | 33.55 | 34.63 | 38.68 | 45.70 | 47.71 | 46.81 | 45.80 | 42.87 | 36.23 | 31.48 | 37.45 | |||||||||||||
1938 | 30.45 | 30.54 | 31.29 | 36.13 | 39.84 | 47.83 | 51.35 | 48.77 | 50.13 | 44.16 | 36.53 | 35.39 | 40.20 | |||||||||||||
1939 | 35.74 | 30.86 | 34.19 | 39.60 | 43.48 | 45.93 | 51.06 | 51.29 | 47.57 | 43.74 | 40.83 | 37.61 | 41.83 | |||||||||||||
1940 | 34.65 | 36.41 | 38.48 | 41.30 | 45.58 | 47.43 | 50.81 | 50.65 | 51.93 | 45.58 | 34.67 | 36.03 | 42.79 | |||||||||||||
1941 | 35.81 | 37.00 | 39.13 | 40.30 | 44.39 | 47.73 | 53.90 | 52.23 | 47.47 | 43.74 | 39.57 | 33.65 | 42.91 | |||||||||||||
1942 | 31.29 | 32.21 | 34.35 | 39.33 | 42.90 | 46.43 | 54.03 | 52.87 | 47.23 | 43.68 | 35.30 | 33.48 | 41.09 | |||||||||||||
1943 | 26.03 | 33.89 | 33.03 | 38.90 | 40.26 | 45.60 | 49.94 | 49.16 | 47.13 | 42.32 | 38.80 | 33.13 | 39.85 | |||||||||||||
1944 | 31.68 | 31.41 | 31.90 | 38.53 | 41.65 | 47.00 | 51.97 | 51.42 | 49.77 | 46.35 | 37.30 | 35.00 | 41.17 | |||||||||||||
1945 | 34.94 | 34.18 | 33.68 | 35.87 | 44.74 | 46.57 | 51.26 | 50.87 | 46.70 | 43.42 | 35.40 | 33.13 | 40.90 | |||||||||||||
1946 | 33.16 | 33.57 | 35.23 | 38.07 | 44.42 | 47.07 | 51.90 | 51.55 | 48.63 | 39.42 | 33.86 | a | 33.39 | 40.86 | ||||||||||||
1947 | 29.35 | 34.71 | 37.90 | 40.53 | 46.29 | 48.47 | 50.74 | 49.97 | 49.21 | a | 44.45 | 38.03 | 35.39 | 42.09 | ||||||||||||
1948 | 31.84 | 30.69 | 33.35 | 36.43 | 43.29 | 50.13 | 50.65 | 52.90 | a | 45.67 | 41.87 | 35.23 | 29.87 | 40.16 | ||||||||||||
1949 | 22.48 | 29.41 | a | 35.32 | 38.73 | 44.58 | 45.67 | 49.29 | 51.55 | 49.57 | 39.68 | 44.93 | 32.48 | 40.31 | ||||||||||||
1950 | 18.00 | 30.86 | 34.47 | a | 36.33 | 40.52 | 47.80 | 51.13 | 52.58 | 46.87 | 42.13 | 37.30 | 38.19 | 39.68 | ||||||||||||
1951 | 30.65 | 32.25 | 31.77 | 36.63 | 43.10 | 48.20 | 51.13 | 48.97 | 48.93 | 43.52 | 36.69 | a | 30.52 | 40.20 | ||||||||||||
1952 | 28.00 | 31.62 | 33.16 | 37.67 | 42.45 | 45.70 | 50.29 | 50.94 | 47.40 | 45.23 | 34.43 | 33.23 | 40.01 | |||||||||||||
1953 | 37.48 | 33.86 | 34.55 | 38.10 | 43.03 | 46.67 | 50.68 | 52.58 | 49.00 | b | 46.64 | i | 39.80 | 36.71 | 42.04 | a | ||||||||||
1954 | 29.10 | 35.46 | 31.03 | 36.13 | 42.68 | 46.13 | 48.87 | 51.17 | a | 48.97 | 41.37 | a | 42.40 | 34.35 | 40.64 | |||||||||||
1955 | 32.26 | 31.14 | 29.45 | 34.77 | 40.19 | 47.33 | 49.55 | 49.20 | a | 46.73 | 43.16 | 30.57 | 30.71 | 38.76 | ||||||||||||
1956 | 30.61 | 28.10 | 31.53 | a | 37.33 | 44.29 | 47.20 | 51.37 | a | 51.61 | 46.90 | 41.13 | 37.77 | 35.13 | 40.25 | |||||||||||
1957 | 25.19 | 30.68 | 35.52 | 39.90 | 46.97 | 49.90 | 50.23 | 49.57 | a | 50.57 | 41.74 | 35.70 | 36.19 | 41.01 | ||||||||||||
1958 | 36.45 | 40.18 | 34.26 | 38.73 | 47.80 | a | 53.77 | 55.94 | 52.97 | 49.81 | d | 45.37 | a | 37.61 | g | 37.77 | a | 44.82 | a | |||||||
1959 | 31.77 | 33.14 | 35.52 | 39.13 | 42.19 | 49.63 | 52.90 | 49.68 | 47.60 | 43.13 | 35.76 | a | 33.61 | 41.17 | ||||||||||||
1960 | 30.87 | 33.55 | 33.52 | 38.80 | 42.10 | a | 47.30 | 52.52 | 51.42 | 47.41 | a | 43.77 | a | 36.37 | 34.03 | a | 40.97 | |||||||||
1961 | 37.19 | 36.82 | 35.73 | a | 38.70 | 43.26 | 49.76 | a | 53.16 | 53.65 | 45.69 | a | 40.60 | a | 34.23 | 32.65 | 41.79 | |||||||||
1962 | 30.77 | 33.93 | 32.55 | 40.03 | 41.77 | 46.10 | 50.71 | 51.93 | a | 49.50 | 44.35 | 39.45 | a | 36.23 | 41.44 | |||||||||||
1963 | 27.23 | 38.43 | 34.81 | 38.20 | 42.45 | 47.59 | a | 50.77 | 53.03 | 52.27 | 44.94 | 38.27 | 35.19 | 41.93 | ||||||||||||
1964 | 34.10 | 32.03 | 34.65 | 36.43 | 39.68 | 47.23 | 51.10 | 50.80 | a | 46.83 | 45.84 | 35.10 | 29.74 | 40.29 | ||||||||||||
1965 | 33.90 | 34.57 | 33.77 | 38.90 | 40.77 | 46.97 | 52.42 | 53.65 | 45.73 | 45.74 | 41.83 | 32.39 | 41.72 | |||||||||||||
1966 | 32.58 | 34.11 | 34.10 | 39.07 | 41.70 | a | 47.33 | 51.03 | 51.61 | 49.87 | 42.03 | 38.67 | 37.58 | 41.64 | ||||||||||||
1967 | 35.81 | 34.79 | 32.97 | 35.43 | 42.94 | 51.00 | 50.77 | 53.71 | 50.43 | 44.81 | 39.23 | 33.00 | 42.07 | |||||||||||||
1968 | 32.29 | 39.38 | 38.74 | 37.07 | 43.68 | 48.37 | 52.39 | 51.39 | 48.40 | 41.84 | 38.20 | 28.52 | 41.69 | |||||||||||||
1969 | 24.23 | 32.00 | 33.97 | 38.50 | 44.03 | 53.20 | 50.35 | 49.26 | 48.83 | 41.19 | 40.17 | 35.35 | 40.92 | |||||||||||||
1970 | 31.45 | 37.21 | 34.29 | 35.23 | 41.45 | 49.77 | 50.19 | 49.48 | 45.53 | 41.29 | 37.67 | 29.58 | 40.26 | |||||||||||||
1971 | 30.48 | 33.96 | 30.52 | 36.53 | 41.84 | 45.77 | 51.55 | 53.87 | 46.93 | 40.68 | 36.73 | 30.48 | 39.95 | |||||||||||||
1972 | 28.61 | 32.66 | 36.26 | 35.10 | 44.32 | 48.80 | 51.87 | 52.23 | 44.83 | 39.19 | 38.53 | 28.65 | 40.09 | |||||||||||||
1973 | 30.42 | 35.43 | 35.10 | 36.90 | 44.00 | 48.13 | 50.65 | 48.26 | 48.80 | 42.23 | 33.70 | 36.35 | 40.83 | |||||||||||||
1974 | 28.97 | 33.25 | 34.13 | 38.60 | 40.26 | 47.77 | 50.94 | 52.52 | 50.40 | 41.23 | 38.10 | 35.16 | 40.94 | |||||||||||||
1975 | 31.16 | 30.71 | 32.26 | 33.47 | 41.65 | 46.67 | 53.35 | 50.48 | 48.67 | 42.58 | 35.17 | 33.87 | 40.00 | |||||||||||||
1976 | 33.87 | 32.83 | 31.13 | 37.90 | 42.35 | 44.87 | 50.39 | 52.35 | 50.20 | 42.23 | ----- | z | 35.68 | 41.25 | a | |||||||||||
1977 | 29.45 | 37.57 | 33.87 | 39.40 | 41.71 | 49.20 | 49.94 | 54.06 | 46.93 | 41.39 | 33.83 | 34.87 | 41.02 | |||||||||||||
1978 | 35.13 | 36.48 | a | 38.06 | 38.80 | 42.58 | 50.87 | 52.58 | 51.84 | 48.67 | 43.94 | 31.93 | 28.65 | 41.63 | ||||||||||||
1979 | 25.42 | 31.32 | 36.90 | 38.63 | 44.71 | 47.23 | 51.58 | 52.81 | 50.93 | 44.74 | 35.60 | 36.42 | 41.36 | |||||||||||||
1980 | 27.10 | 34.55 | 35.71 | 39.87 | 43.19 | 47.60 | 51.26 | 50.13 | 48.27 | 43.00 | 38.70 | 35.74 | 41.26 | |||||||||||||
1981 | 39.94 | 34.26 | a | 37.90 | 38.80 | 42.58 | 46.47 | 51.23 | 54.57 | a | 49.10 | 39.65 | 38.73 | 32.77 | 42.17 | |||||||||||
1982 | 32.00 | b | 31.31 | b | 33.76 | b | 34.86 | a | 41.00 | 49.70 | c | 50.07 | a | 52.10 | a | 49.29 | b | 42.90 | a | 33.17 | 32.58 | 40.23 | ||||
1983 | 35.83 | a | 37.00 | 38.87 | 37.72 | a | 43.89 | c | 47.86 | a | 50.41 | b | 52.07 | a | 45.59 | a | 40.23 | a | 38.67 | 25.71 | 41.15 | |||||
1984 | 34.65 | 35.17 | 37.35 | 36.63 | 41.34 | b | 45.07 | 49.42 | 49.48 | 47.10 | 39.65 | 35.90 | 28.81 | 40.05 | ||||||||||||
1985 | 31.19 | 28.29 | 31.84 | 37.83 | 42.29 | 45.23 | 52.32 | 50.03 | 45.40 | 40.32 | 26.43 | 29.03 | 38.35 | |||||||||||||
1986 | 35.94 | 30.93 | 37.48 | 36.37 | 43.16 | 49.34 | a | 49.03 | 52.71 | 45.23 | 43.26 | 36.23 | 33.55 | 41.10 | ||||||||||||
1987 | 31.83 | a | 37.19 | a | 36.74 | 39.00 | 43.52 | 47.33 | 50.81 | 49.94 | 47.83 | 42.00 | 40.13 | 29.68 | 41.33 | |||||||||||
1988 | 30.97 | a | 33.97 | 33.94 | 38.37 | 41.84 | 45.53 | 48.97 | 49.32 | 45.77 | 45.42 | 36.20 | 34.19 | 40.37 | ||||||||||||
1989 | 31.58 | 24.36 | 32.65 | 38.07 | 42.10 | 48.37 | 49.48 | 50.45 | 47.30 | 40.77 | a | 38.03 | 34.19 | 39.78 | ||||||||||||
1990 | 33.97 | 29.18 | 35.40 | a | 40.30 | 41.84 | 46.52 | a | 52.72 | b | 51.81 | 48.90 | 38.94 | 36.93 | 24.94 | 40.12 | ||||||||||
1991 | 29.16 | 37.35 | b | 32.06 | 36.47 | 42.06 | 44.76 | a | 51.00 | 52.26 | 47.48 | a | 40.00 | a | 37.07 | 36.10 | 40.48 | |||||||||
1992 | 34.53 | a | 38.14 | a | 38.00 | 40.47 | 44.16 | 49.33 | 52.58 | 50.74 | 45.79 | a | 42.32 | 36.07 | 29.32 | 41.79 | ||||||||||
1993 | 27.77 | 31.21 | 35.62 | b | 38.73 | 46.29 | 48.14 | a | 49.90 | a | 51.39 | 45.67 | 44.17 | a | 29.82 | b | 31.97 | 40.06 | ||||||||
1994 | 36.16 | 29.93 | 35.26 | 39.50 | 43.13 | a | 45.17 | a | 51.26 | 51.13 | a | 49.90 | 41.71 | 32.07 | a | 31.52 | 40.56 | |||||||||
1995 | 35.16 | 34.56 | a | 35.62 | b | 38.07 | 44.71 | 48.40 | 53.53 | a | 49.79 | b | 51.23 | 41.67 | a | 40.60 | 31.26 | 42.05 | ||||||||
1996 | 31.23 | 30.59 | ----- | z | 38.03 | a | 39.73 | a | 44.40 | 50.97 | 50.55 | 45.60 | 41.30 | a | 35.33 | 31.19 | 39.90 | a | ||||||||
1997 | 31.83 | a | 33.61 | 35.35 | 37.07 | a | 45.40 | a | 48.93 | 51.97 | a | 54.47 | a | 51.10 | 43.45 | 40.72 | a | 35.97 | 42.49 | |||||||
1998 | 34.68 | c | 37.59 | a | 37.10 | 38.93 | b | 45.61 | 49.70 | 55.45 | 52.71 | 49.77 | 43.73 | a | 39.80 | 31.55 | 43.05 | |||||||||
1999 | 35.00 | 33.78 | a | 34.55 | b | 33.61 | l | 39.43 | a | 47.27 | 50.16 | 54.13 | 47.62 | a | 42.39 | 40.24 | a | 35.47 | a | 41.82 | a | |||||
2000 | 32.47 | a | 35.00 | a | 34.55 | b | 39.59 | a | 43.45 | 48.68 | b | 51.48 | 50.60 | a | 49.07 | a | 42.74 | 34.45 | a | 32.74 | 41.23 | |||||
2001 | 33.97 | 32.36 | 35.83 | b | 36.90 | a | 40.97 | b | 46.20 | 50.27 | a | 52.93 | a | 49.41 | c | 42.03 | a | 40.11 | b | 33.39 | 41.20 | |||||
2002 | 33.55 | 33.64 | 33.00 | b | 36.66 | a | 41.77 | a | 48.80 | 50.66 | b | 51.03 | a | 47.33 | 40.64 | c | 41.37 | 36.29 | 41.23 | |||||||
2003 | 39.04 | c | 33.93 | 37.41 | b | 38.39 | b | 43.17 | b | 50.00 | b | 52.34 | b | 52.62 | b | 48.85 | c | 43.93 | a | 34.52 | a | 34.34 | b | 42.38 | ||
2004 | 32.32 | 35.10 | 37.83 | a | 39.79 | b | 45.72 | b | 49.62 | f | 54.42 | g | 55.87 | 49.04 | b | 44.00 | b | 36.22 | c | 34.60 | f | 41.77 | c | |||
2005 | 34.83 | b | 33.58 | d | 38.07 | b | 39.45 | a | 47.00 | b | 48.14 | a | 51.92 | f | 52.82 | c | 45.63 | c | 45.76 | f | 35.80 | e | 34.76 | b | 41.01 | b |
2006 | 36.32 | c | 31.41 | a | 35.07 | a | 38.88 | d | 43.45 | b | 49.76 | a | 52.93 | a | 51.43 | a | 49.55 | a | 41.14 | c | 35.82 | b | 33.86 | c | 41.64 | |
2007 | 30.60 | a | 35.92 | b | 37.17 | a | 38.97 | a | 43.43 | c | 47.81 | d | 54.38 | b | 52.35 | e | 48.24 | a | 41.52 | d | 36.93 | b | ----- | z | 42.48 | a |
2008 | 30.93 | d | 34.28 | 33.52 | 34.13 | 44.30 | a | 44.10 | a | 50.23 | 52.03 | 47.63 | 41.93 | d | ----- | z | 27.77 | 40.08 | a | |||||||
2009 | 30.32 | 31.63 | a | 30.83 | a | 34.30 | ----- | z | ----- | z | ----- | z | 53.45 | 51.60 | 42.03 | 37.62 | a | 30.21 | b | 38.00 | c | |||||
2010 | 38.61 | 37.43 | 35.80 | a | 38.73 | 41.32 | 46.97 | a | 52.17 | b | 52.90 | 51.53 | 44.30 | a | 35.34 | a | 35.10 | 42.52 | ||||||||
2011 | 34.77 | 31.21 | d | 34.83 | a | 35.10 | a | 39.82 | c | 48.40 | 51.40 | a | 53.48 | 51.03 | 43.55 | 33.87 | 31.77 | 40.77 | ||||||||
2012 | 30.97 | 36.48 | 33.90 | b | 39.93 | 42.58 | 46.53 | 53.78 | d | 54.39 | 49.47 | 43.52 | 39.07 | 33.77 | 42.03 | |||||||||||
2013 | 29.48 | d | 34.79 | 36.53 | a | 39.31 | a | 45.21 | b | 51.00 | d | 52.77 | a | 55.68 | c | 52.21 | a | 40.71 | 39.23 | 30.42 | 42.28 | |||||
2014 | 34.73 | a | 30.89 | 36.68 | c | 41.50 | 47.73 | a | 49.43 | 54.57 | c | 56.83 | a | 53.03 | 49.53 | n | ----- | z | ----- | z | 45.05 | c | ||||
2015 | 39.25 | c | 40.88 | b | 39.19 | 39.03 | 47.48 | 52.33 | 56.00 | 54.94 | 48.80 | 48.90 | 36.20 | 34.58 | 44.80 | |||||||||||
2016 | 35.52 | 39.79 | 38.81 | 44.67 | 47.03 | 49.27 | 54.39 | 54.61 | 49.43 | 45.65 | 43.97 | a | 29.65 | 44.40 | ||||||||||||
2017 | 29.60 | a | 33.18 | 36.71 | 39.70 | 45.06 | 49.70 | 52.06 | 55.81 | 52.17 | 41.84 | 38.20 | 33.16 | 42.27 | ||||||||||||
2018 | 37.87 | 32.50 | 35.65 | 41.33 | 47.84 | 49.83 | 54.71 | 55.61 | 49.40 | 43.94 | 41.23 | 34.58 | 43.71 | |||||||||||||
2019 | 37.50 | a | 27.00 | 34.84 | 40.80 | 46.84 | 49.47 | 54.48 | 55.26 | 52.03 | 40.61 | 37.43 | 35.42 | 42.64 | ||||||||||||
2020 | 35.39 | 33.66 | 34.13 | 39.13 | 46.71 | 49.60 | 53.48 | 51.77 | 53.87 | 44.10 | 37.90 | 35.81 | 42.96 | |||||||||||||
2021 | 34.26 | 31.25 | 34.06 | 38.47 | 43.94 | 52.83 | 54.87 | 55.43 | a | 49.70 | 43.07 | a | 39.93 | 29.48 | d | 42.27 | ||||||||||
2022 | 32.94 | 33.79 | 37.03 | b | 36.04 | b | 42.45 | 50.25 | j | 56.35 | h | 56.32 | c | 53.00 | 46.03 | a | 34.27 | 29.42 | 40.13 | b | ||||||
2023 | 35.00 | 31.22 | a | 34.30 | a | 37.80 | 48.74 | 48.34 | a | 52.97 | 56.61 | 50.50 | 43.35 | 36.40 | 36.33 | a | 42.63 | |||||||||
2024 | 30.65 | 36.04 | a | 31.32 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.67 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.90 | 33.18 | 34.74 | 37.97 | 43.04 | 47.67 | 51.15 | 51.64 | 48.23 | 42.45 | 36.85 | 32.90 | 40.92 | |||||||||||||
S.D. | 4.11 | 3.47 | 2.31 | 2.08 | 2.30 | 2.09 | 2.11 | 2.29 | 2.31 | 1.96 | 3.01 | 2.93 | 1.49 | |||||||||||||
SKEW | -0.90 | -0.69 | -0.10 | -0.19 | 0.24 | 0.39 | -0.10 | 0.13 | 0.11 | 0.37 | -0.32 | -0.44 | -0.32 | |||||||||||||
MAX | 39.94 | 40.88 | 39.19 | 44.67 | 48.74 | 53.77 | 56.00 | 56.83 | 53.87 | 48.90 | 44.93 | 38.52 | 44.80 | |||||||||||||
MIN | 18.00 | 20.00 | 29.45 | 32.87 | 37.94 | 42.07 | 45.65 | 46.52 | 42.93 | 38.48 | 26.43 | 24.94 | 37.29 | |||||||||||||
YRS | 100 | 100 | 99 | 97 | 98 | 96 | 96 | 100 | 100 | 97 | 96 | 97 | 86 |