YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 21.91 | t | 35.25 | i | ----- | z | 37.80 | y | 49.48 | 57.80 | 66.84 | 65.68 | 60.10 | 48.13 | 41.30 | 29.52 | 52.36 | d | ||||||||
1933 | 27.94 | 26.54 | 36.03 | 38.70 | 45.19 | 57.20 | 67.58 | 65.42 | 60.77 | 51.58 | 39.90 | 34.77 | 45.97 | |||||||||||||
1934 | 32.39 | 38.93 | 45.81 | 48.83 | 56.06 | 55.60 | 69.55 | 68.17 | a | 60.53 | 52.55 | 42.17 | 37.84 | 50.70 | ||||||||||||
1935 | 35.17 | a | 37.29 | 36.00 | 44.07 | 45.32 | 58.83 | 65.10 | 66.81 | 59.63 | 48.29 | 38.13 | 34.77 | 47.45 | ||||||||||||
1936 | 31.55 | 34.45 | 39.13 | 46.03 | 52.97 | 63.40 | 67.84 | 67.32 | 58.67 | 50.23 | 41.17 | 33.87 | 48.88 | |||||||||||||
1937 | 19.77 | 32.29 | 37.29 | 41.83 | 51.32 | 57.43 | 66.68 | 66.81 | 62.23 | 51.29 | 40.53 | 36.35 | 46.99 | |||||||||||||
1938 | 34.06 | 34.46 | 36.45 | 41.93 | 49.55 | 57.17 | 64.19 | 65.74 | 61.70 | 48.77 | 33.67 | 35.58 | 46.94 | |||||||||||||
1939 | 31.71 | 25.29 | 36.74 | 43.55 | a | 49.65 | 56.47 | 65.97 | 65.23 | a | 58.73 | 45.68 | 41.70 | 36.77 | 46.46 | |||||||||||
1940 | 33.52 | 33.59 | 38.94 | 44.00 | 52.94 | 60.10 | 66.29 | 66.77 | 61.57 | 51.74 | 37.57 | 39.13 | 48.85 | |||||||||||||
1941 | 35.61 | 39.14 | 38.29 | 39.17 | 50.10 | a | 55.60 | 63.45 | 61.94 | 54.50 | 44.94 | 40.00 | 34.10 | 46.40 | ||||||||||||
1942 | 32.26 | 28.81 | a | 34.65 | e | 41.30 | 46.81 | 53.57 | 65.87 | 62.42 | 56.23 | 46.23 | 38.57 | 33.07 | a | 44.98 | ||||||||||
1943 | 33.84 | 36.43 | 40.10 | 45.70 | 52.29 | 57.21 | b | 65.74 | 65.48 | 59.70 | 48.84 | 39.70 | 34.29 | 48.28 | ||||||||||||
1944 | 30.68 | 32.34 | 34.26 | 38.80 | 47.68 | 52.80 | 61.55 | 64.03 | 56.63 | 49.45 | 37.63 | 34.90 | 45.06 | |||||||||||||
1945 | 32.00 | 34.14 | 34.32 | 40.27 | 47.26 | 53.73 | 66.71 | 65.90 | 58.17 | 49.39 | 36.00 | 29.55 | 45.62 | |||||||||||||
1946 | 29.61 | 28.07 | 32.81 | 46.24 | a | 46.58 | 57.57 | 64.71 | 64.77 | 58.63 | 42.27 | a | 33.97 | 34.55 | 44.98 | |||||||||||
1947 | 26.65 | 35.18 | 34.65 | 39.07 | 50.77 | 53.47 | 63.65 | 62.48 | 62.53 | 49.97 | 35.53 | 30.03 | 45.33 | |||||||||||||
1948 | 31.84 | 31.48 | 35.27 | t | 42.17 | 49.16 | 56.17 | 65.81 | 65.35 | 59.67 | 50.45 | 34.47 | 32.16 | 47.16 | a | |||||||||||
1949 | 24.77 | 28.64 | 34.00 | 45.37 | 48.77 | 57.93 | 66.23 | 61.42 | 60.57 | 45.74 | 44.30 | 30.10 | 45.65 | |||||||||||||
1950 | 28.26 | 36.96 | 37.23 | 44.17 | 45.45 | 54.10 | 64.55 | 61.92 | e | 55.83 | 51.90 | a | 42.53 | 37.90 | 46.73 | |||||||||||
1951 | 30.65 | 34.29 | 35.52 | 40.63 | 49.39 | 55.13 | 67.68 | 64.10 | 59.97 | 49.06 | 38.77 | 32.26 | 46.45 | |||||||||||||
1952 | 30.77 | 31.62 | 32.06 | 43.83 | 52.13 | 55.57 | 63.45 | 67.03 | 63.07 | 55.10 | 36.27 | 32.74 | 46.97 | |||||||||||||
1953 | 35.52 | 31.07 | 37.16 | 40.97 | 43.90 | 56.73 | 60.00 | 64.35 | 60.27 | 48.39 | 41.67 | 31.00 | 45.92 | |||||||||||||
1954 | 32.52 | 38.75 | 36.52 | 45.63 | 51.26 | 57.75 | b | 68.26 | 63.32 | 60.37 | ----- | z | 43.93 | 33.32 | 48.33 | a | ||||||||||
1955 | 29.84 | 28.14 | 35.65 | 39.10 | 47.31 | e | 55.50 | 61.42 | 65.45 | 58.20 | 52.06 | 40.20 | 35.03 | 45.66 | ||||||||||||
1956 | 36.32 | 27.38 | 37.32 | 42.66 | a | 52.03 | 61.33 | 65.68 | 62.35 | 64.11 | b | 47.94 | 37.37 | 33.13 | 47.30 | |||||||||||
1957 | 37.13 | 42.25 | 39.41 | b | 41.73 | 47.97 | 60.43 | 68.30 | a | 65.39 | 59.30 | 50.29 | 36.40 | 35.45 | 48.67 | |||||||||||
1958 | 31.29 | 36.68 | 34.61 | 40.43 | 55.39 | 60.43 | 66.77 | 68.42 | e | 61.17 | 51.45 | 38.90 | 37.03 | 48.55 | ||||||||||||
1959 | 33.45 | 32.32 | 37.00 | 46.90 | 47.35 | 62.17 | 68.42 | 64.37 | a | 56.73 | 49.68 | 40.83 | 35.42 | 47.89 | ||||||||||||
1960 | 27.45 | 28.38 | 39.52 | 42.13 | 48.74 | 62.70 | 65.52 | 65.42 | 61.23 | 49.55 | 39.40 | 32.16 | 46.85 | |||||||||||||
1961 | 34.90 | 34.46 | 35.06 | 44.20 | 48.26 | 61.70 | 67.23 | 66.06 | 56.83 | 46.94 | 36.27 | 32.94 | 47.07 | |||||||||||||
1962 | 31.87 | 34.64 | 31.39 | 46.93 | 47.17 | b | 56.30 | 64.10 | 66.03 | 60.83 | 49.55 | 43.57 | 36.61 | 47.42 | ||||||||||||
1963 | 28.39 | 38.21 | 35.55 | 40.37 | 51.58 | 54.03 | 67.52 | 65.20 | a | 60.80 | 52.58 | 40.90 | 33.23 | 47.36 | ||||||||||||
1964 | 28.06 | 28.10 | 33.35 | 40.87 | 48.81 | 56.43 | 68.06 | 64.74 | 59.03 | 53.35 | 35.13 | 32.42 | 45.70 | |||||||||||||
1965 | 35.42 | 32.64 | 34.29 | 41.77 | 45.77 | 50.57 | 66.81 | 63.68 | 54.43 | 51.77 | 42.97 | 34.81 | 46.24 | |||||||||||||
1966 | 28.97 | 28.82 | 37.58 | 42.67 | 50.65 | 56.90 | 67.35 | 65.42 | 60.57 | 48.19 | 39.40 | 32.39 | 46.58 | |||||||||||||
1967 | 30.90 | 33.71 | 37.32 | 36.30 | 48.52 | 55.43 | 67.55 | 65.45 | 60.67 | 49.77 | 42.07 | 27.45 | 46.26 | |||||||||||||
1968 | 31.32 | 40.21 | 38.48 | 40.33 | 49.13 | 57.47 | 64.10 | 61.42 | 56.53 | 48.29 | 39.33 | 28.35 | 46.25 | |||||||||||||
1969 | 37.32 | 32.39 | 32.42 | 40.83 | 49.39 | 56.63 | 66.13 | 68.81 | 61.00 | 45.26 | 40.07 | 34.74 | 47.08 | |||||||||||||
1970 | 30.10 | 37.29 | 36.42 | 37.60 | 49.81 | 60.37 | 68.58 | 66.06 | 54.33 | 44.23 | a | 38.80 | 31.71 | 46.27 | ||||||||||||
1971 | 31.35 | 31.68 | 36.45 | 40.03 | 46.19 | 56.43 | 66.45 | 64.81 | 58.33 | 44.32 | 37.13 | 30.29 | 45.29 | |||||||||||||
1972 | 28.97 | 33.72 | 42.10 | 40.43 | 48.61 | 59.33 | 67.87 | 63.16 | 58.50 | 47.26 | h | 35.10 | 30.77 | 46.23 | a | |||||||||||
1973 | 28.74 | 33.56 | a | 33.03 | 37.40 | 49.10 | 57.77 | 64.06 | 63.39 | 54.87 | 46.71 | 35.80 | 32.13 | 44.71 | ||||||||||||
1974 | 31.52 | 29.50 | 37.42 | 39.53 | 48.10 | 60.05 | j | 63.84 | 61.58 | 57.68 | b | 47.80 | k | 37.60 | 28.45 | 43.52 | b | |||||||||
1975 | 30.96 | f | 30.93 | 33.19 | 35.73 | 47.84 | 56.17 | 66.48 | 61.42 | 51.67 | i | 47.52 | 37.87 | 34.55 | k | 46.35 | c | |||||||||
1976 | 32.71 | 37.21 | e | 35.12 | g | 38.63 | 48.71 | 54.03 | 60.94 | 61.83 | a | 58.00 | 46.41 | d | 40.30 | 32.65 | 46.49 | a | ||||||||
1977 | 32.19 | 35.43 | 31.87 | 42.53 | 44.58 | 59.13 | 64.23 | 66.65 | 59.63 | 51.68 | 40.80 | 37.71 | 47.20 | |||||||||||||
1978 | 35.48 | 36.00 | a | 42.10 | 40.60 | 47.10 | b | 59.23 | 65.65 | 62.45 | 58.53 | 53.29 | 40.43 | 30.32 | 47.60 | |||||||||||
1979 | 29.19 | 31.54 | 36.29 | 40.43 | 48.87 | 57.43 | 63.71 | 61.19 | 60.47 | 50.52 | 35.27 | 35.58 | 45.87 | |||||||||||||
1980 | 36.39 | 38.45 | 35.97 | 41.55 | a | 45.58 | 57.57 | 66.74 | 64.40 | a | 59.37 | 49.13 | 39.33 | 39.26 | 47.81 | |||||||||||
1981 | 36.74 | 36.00 | 36.45 | 44.90 | 49.26 | 61.20 | 66.84 | 66.29 | 59.83 | 47.06 | 41.60 | 35.71 | 48.49 | |||||||||||||
1982 | 32.52 | 36.71 | 38.16 | 41.00 | 47.87 | 52.07 | 63.84 | 66.42 | 58.90 | 45.29 | 39.00 | 31.81 | 46.13 | |||||||||||||
1983 | 33.19 | 36.32 | 37.45 | 37.17 | 47.03 | 54.00 | 63.84 | 65.00 | 61.27 | 49.48 | 37.50 | 34.97 | 46.44 | |||||||||||||
1984 | 33.42 | 32.03 | 37.70 | d | 41.53 | 52.55 | 56.50 | 66.58 | 63.68 | 59.77 | 42.74 | 36.23 | 34.03 | 46.40 | ||||||||||||
1985 | 32.03 | 31.68 | 37.87 | 44.72 | a | 48.81 | 59.60 | 66.68 | 63.45 | 53.00 | 49.10 | 37.33 | 33.65 | 46.49 | ||||||||||||
1986 | 36.74 | 36.86 | 41.26 | 43.03 | 48.45 | 58.87 | 62.58 | 65.68 | 52.93 | 45.23 | 38.23 | 33.84 | 46.97 | |||||||||||||
1987 | 30.39 | 33.82 | 34.48 | 45.67 | 49.61 | 58.28 | a | 59.90 | 63.81 | 57.03 | 53.06 | 37.63 | 30.26 | 46.16 | ||||||||||||
1988 | 31.87 | 36.38 | 34.84 | 42.13 | 47.23 | 59.10 | 65.06 | 63.61 | 54.47 | 52.26 | 36.93 | 30.58 | 46.21 | |||||||||||||
1989 | 31.55 | 34.00 | a | 38.93 | a | 47.30 | 50.45 | 57.23 | 66.10 | 61.16 | 57.93 | a | 48.67 | a | 39.50 | 32.32 | 47.10 | |||||||||
1990 | 31.23 | a | 31.57 | 38.90 | a | 46.00 | 47.19 | 60.23 | 65.55 | 61.29 | 60.83 | a | 48.55 | b | 39.00 | 29.16 | 46.63 | |||||||||
1991 | 32.87 | 38.96 | 35.13 | 38.57 | 45.39 | 53.13 | 64.37 | d | 65.78 | d | 59.43 | b | 51.20 | a | 39.13 | 34.10 | 46.50 | |||||||||
1992 | 33.00 | a | 37.93 | a | 38.83 | a | 44.77 | 51.66 | b | 54.80 | 63.48 | 63.77 | 57.63 | 49.58 | 35.27 | 31.67 | a | 46.87 | ||||||||
1993 | 36.45 | 36.07 | 39.16 | 42.60 | 51.03 | 56.10 | a | 61.29 | 63.35 | 55.71 | b | 48.50 | a | 36.00 | 31.19 | 46.46 | ||||||||||
1994 | 32.03 | 31.44 | a | 38.23 | 43.17 | 48.03 | 60.07 | c | 63.87 | a | 67.44 | d | 60.33 | c | 46.86 | b | 33.00 | 35.48 | 46.66 | |||||||
1995 | 34.26 | 39.86 | 37.58 | 40.17 | 44.77 | 55.17 | a | 63.57 | a | 67.17 | a | 60.19 | c | 48.76 | b | 44.38 | a | 33.97 | 47.49 | |||||||
1996 | 31.97 | 39.72 | 39.35 | 45.17 | 50.94 | 59.73 | 68.60 | a | 66.54 | c | 58.31 | a | 47.41 | d | 40.50 | 33.61 | 48.49 | |||||||||
1997 | 33.29 | 33.64 | 40.71 | 42.70 | 54.52 | 56.23 | 64.84 | 66.50 | a | 63.34 | a | 46.17 | a | 38.97 | 32.00 | 47.74 | ||||||||||
1998 | 34.10 | 33.21 | 37.58 | 38.03 | 44.42 | 52.07 | 66.61 | 66.42 | 59.17 | a | 46.52 | b | 38.27 | 33.39 | 45.82 | |||||||||||
1999 | 34.19 | 35.14 | 35.84 | 37.90 | 48.10 | 56.73 | 65.19 | 64.77 | a | 59.41 | a | 50.17 | a | 41.80 | 33.19 | 46.87 | ||||||||||
2000 | 34.10 | 36.45 | 39.43 | a | 46.31 | a | 54.55 | 62.67 | 66.48 | ----- | z | 60.63 | 49.70 | a | 34.54 | b | 34.94 | 47.25 | a | |||||||
2001 | 32.50 | c | 32.12 | c | 39.03 | a | 42.34 | a | 53.34 | b | 60.00 | a | 65.90 | 65.68 | 61.20 | 52.00 | 43.20 | 31.13 | 48.20 | |||||||
2002 | 32.35 | 35.04 | 36.13 | 46.23 | 49.97 | 60.67 | 69.53 | a | 66.00 | 60.37 | c | 47.68 | 41.97 | a | 32.93 | a | 48.24 | |||||||||
2003 | 39.67 | a | 36.54 | b | 38.27 | a | 38.96 | e | 52.15 | e | 58.93 | a | 70.10 | a | 68.15 | d | 62.58 | d | 56.85 | d | 38.60 | e | 33.73 | a | 49.54 | |
2004 | 34.66 | b | 32.11 | a | 44.38 | e | 43.00 | d | 50.56 | d | 57.89 | c | 64.19 | d | 63.79 | c | 59.54 | b | 49.31 | b | 38.00 | c | 35.23 | 47.72 | ||
2005 | 37.10 | b | 38.70 | a | 38.10 | a | 40.30 | c | 52.00 | a | 56.81 | c | 66.69 | e | 64.95 | i | 58.10 | 50.83 | a | 40.76 | a | 34.07 | a | 46.68 | a | |
2006 | 32.93 | a | 35.14 | 35.38 | b | 42.83 | a | 54.03 | a | 62.50 | 70.52 | 65.81 | 58.30 | 48.13 | 41.80 | 32.84 | 48.35 | |||||||||
2007 | 31.82 | c | 35.86 | 41.81 | 44.24 | a | 53.55 | 60.07 | 68.87 | 69.07 | b | 61.10 | 50.16 | 45.93 | 32.26 | 49.56 | ||||||||||
2008 | 32.16 | 34.66 | 37.00 | 40.60 | 47.83 | a | 60.30 | 67.13 | 67.03 | 60.37 | 51.38 | b | 43.55 | a | 35.29 | 48.11 | ||||||||||
2009 | 36.39 | 34.54 | 38.45 | 42.03 | 56.06 | 58.00 | c | 68.65 | 65.00 | 61.31 | a | 47.45 | 42.63 | 31.58 | 48.51 | |||||||||||
2010 | 35.48 | 35.75 | 36.94 | 39.87 | 47.48 | 57.57 | 68.84 | 66.26 | 61.50 | 51.52 | 36.86 | a | 39.33 | a | 48.12 | |||||||||||
2011 | 32.35 | 30.39 | 39.39 | 44.37 | 47.74 | 57.03 | 67.68 | 69.56 | d | 62.56 | e | 52.14 | c | 38.25 | b | 33.81 | 47.94 | |||||||||
2012 | 34.55 | 33.72 | 36.48 | 45.83 | 52.90 | a | 60.60 | 67.83 | a | 68.03 | 61.23 | 49.61 | c | 41.86 | a | 33.16 | 48.82 | |||||||||
2013 | 30.58 | 31.29 | 41.00 | 44.97 | 50.27 | a | 61.07 | b | 68.35 | 66.77 | a | 59.57 | 45.48 | 41.27 | 32.29 | 47.74 | ||||||||||
2014 | 36.70 | a | ----- | z | 40.97 | 43.37 | 50.58 | 59.53 | 66.45 | 64.35 | 61.07 | 52.03 | 39.47 | 36.32 | 50.08 | a | ||||||||||
2015 | 37.13 | 39.50 | 43.35 | 41.03 | 48.19 | 61.93 | 64.90 | 67.32 | 62.70 | 53.39 | 36.57 | 31.35 | 48.95 | |||||||||||||
2016 | 32.23 | 38.24 | 40.58 | 45.20 | 48.65 | 63.13 | 66.65 | 64.77 | 59.40 | 52.35 | 43.00 | 35.77 | 49.16 | |||||||||||||
2017 | 34.97 | 38.07 | 41.32 | 42.67 | 49.97 | 61.67 | 67.45 | 65.13 | 57.87 | 50.90 | 44.77 | 36.26 | 49.25 | |||||||||||||
2018 | 37.03 | 34.36 | 39.61 | 48.33 | 51.57 | a | 59.97 | 67.68 | 65.00 | 61.20 | 50.16 | 37.83 | a | 33.35 | 48.84 | |||||||||||
2019 | 34.90 | 31.39 | 37.84 | 44.70 | 45.61 | 57.57 | 65.67 | a | 66.10 | 60.00 | 45.52 | 41.80 | 35.73 | a | 47.24 | |||||||||||
2020 | 32.90 | 33.45 | 37.90 | 41.90 | a | 51.67 | a | 57.03 | 67.10 | 68.63 | a | 60.97 | 51.21 | b | ----- | z | 32.45 | 48.66 | a | |||||||
2021 | 33.72 | b | 35.18 | 35.63 | a | 46.83 | 49.73 | a | 64.77 | 69.87 | 67.03 | 62.83 | 47.81 | 44.40 | 38.06 | 49.66 | ||||||||||
2022 | 34.06 | 33.61 | 38.84 | 45.69 | a | 52.71 | 63.30 | 71.03 | 67.87 | a | 63.87 | 50.20 | a | 34.28 | a | 34.81 | 49.19 | |||||||||
2023 | 32.26 | 31.54 | 35.26 | 42.33 | 48.23 | 52.80 | 68.97 | 69.16 | 59.60 | 51.37 | a | 41.90 | 36.32 | 47.48 | ||||||||||||
2024 | 33.21 | g | 36.62 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.62 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 32.61 | 34.17 | 37.34 | 42.36 | 49.38 | 57.84 | 66.05 | 65.18 | 59.43 | 49.26 | 39.28 | 33.59 | 47.22 | |||||||||||||
S.D. | 3.06 | 3.45 | 2.77 | 2.87 | 2.72 | 2.95 | 2.29 | 2.06 | 2.36 | 2.71 | 2.89 | 2.51 | 1.28 | |||||||||||||
SKEW | -0.85 | -0.24 | 0.34 | -0.00 | 0.32 | -0.01 | -0.44 | -0.16 | -0.69 | -0.15 | 0.01 | 0.03 | 0.29 | |||||||||||||
MAX | 39.67 | 42.25 | 45.81 | 48.83 | 56.06 | 64.77 | 71.03 | 69.56 | 64.11 | 56.85 | 45.93 | 39.33 | 50.70 | |||||||||||||
MIN | 19.77 | 25.29 | 31.39 | 35.73 | 43.90 | 50.57 | 59.90 | 61.16 | 52.93 | 42.27 | 33.00 | 27.45 | 44.71 | |||||||||||||
YRS | 90 | 91 | 89 | 91 | 92 | 91 | 92 | 90 | 91 | 89 | 91 | 91 | 81 |