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 | 30.06 | 28.93 | 36.52 | 42.28 | a | 51.63 | a | 58.23 | 70.06 | 66.43 | a | 58.07 | a | 47.65 | 32.17 | f | 31.55 | 47.40 | a | |||||||
1930 | 32.29 | 34.19 | a | 37.90 | 45.45 | a | 46.68 | 60.85 | c | 69.26 | 66.71 | 58.38 | a | 46.77 | 38.97 | a | 29.87 | 47.28 | ||||||||
1931 | 31.77 | 38.93 | 39.45 | 50.40 | 53.84 | 62.67 | 74.32 | 68.42 | 60.27 | d | 50.55 | 38.60 | 31.17 | b | 50.03 | |||||||||||
1932 | 28.03 | 36.86 | a | 38.93 | a | 43.27 | 51.06 | 57.63 | 69.10 | 67.27 | a | 60.70 | 49.61 | 40.77 | 30.74 | 47.83 | ||||||||||
1933 | 29.87 | a | 27.82 | 38.10 | a | 40.90 | 46.00 | a | 59.77 | 71.42 | 68.52 | 65.10 | a | 53.10 | a | 39.50 | 35.10 | 47.93 | ||||||||
1934 | 32.81 | 39.07 | 43.97 | 48.86 | a | 57.19 | 57.60 | 71.32 | 69.81 | 59.93 | 50.58 | 40.69 | a | 36.33 | a | 50.68 | ||||||||||
1935 | 33.00 | c | 37.00 | 37.10 | 45.87 | 49.48 | 59.50 | 66.19 | 68.26 | 60.83 | 48.13 | 36.47 | 33.90 | 47.98 | ||||||||||||
1936 | 30.67 | a | 34.79 | 41.68 | 47.03 | 54.00 | 64.17 | 69.74 | 68.68 | 59.93 | 50.61 | 40.30 | 32.88 | g | 51.05 | a | ||||||||||
1937 | 22.42 | e | 31.57 | 37.35 | 41.79 | a | 52.29 | 59.13 | 68.68 | 68.35 | 64.23 | 50.73 | a | 39.69 | a | 36.14 | b | 47.70 | ||||||||
1938 | 33.59 | b | 33.96 | 36.81 | 44.60 | 51.73 | a | 60.83 | 66.32 | 68.32 | 63.10 | 48.16 | 32.13 | 34.94 | 47.87 | |||||||||||
1939 | 31.48 | 27.50 | 38.06 | 45.30 | 51.27 | a | 59.47 | 69.00 | 68.23 | a | 63.67 | 44.93 | b | 40.37 | 35.19 | 47.87 | ||||||||||
1940 | 33.52 | 34.38 | 39.61 | 44.97 | 55.19 | 64.00 | 67.97 | 68.42 | 60.93 | 50.90 | 36.10 | 36.50 | a | 49.37 | ||||||||||||
1941 | 33.42 | 38.04 | 37.46 | c | 40.43 | 52.24 | b | 56.47 | 66.00 | 62.42 | 54.70 | 46.29 | 38.27 | 33.45 | 46.60 | |||||||||||
1942 | 30.32 | 29.11 | 33.25 | c | 42.97 | 46.63 | a | 57.73 | 68.35 | 67.68 | 58.93 | 46.48 | 40.47 | 32.77 | a | 46.22 | ||||||||||
1943 | 31.77 | 34.96 | 39.13 | 45.27 | 51.74 | 57.60 | 66.06 | 67.65 | 60.57 | 49.06 | 35.60 | 33.81 | 47.77 | |||||||||||||
1944 | 29.32 | 31.93 | 35.74 | 40.60 | 49.84 | 53.23 | 65.26 | 65.81 | 60.90 | 49.52 | 37.21 | a | 33.39 | 46.06 | ||||||||||||
1945 | 30.60 | a | 34.43 | 33.74 | 39.38 | d | 50.52 | 56.70 | c | 70.28 | b | 67.97 | 60.05 | i | 52.90 | j | ----- | z | ----- | z | 47.95 | d | ||||
1946 | ----- | z | 43.00 | a | ----- | z | 53.21 | f | 57.29 | c | 67.34 | a | 70.90 | a | 72.27 | e | 65.93 | 48.35 | 36.85 | c | 35.33 | d | 55.25 | c | ||
1947 | 30.22 | d | 34.67 | d | 39.31 | e | 45.04 | c | 55.30 | a | 59.97 | a | 67.67 | a | 64.97 | a | 61.47 | 47.71 | 33.37 | c | 29.48 | b | 47.43 | |||
1948 | 29.45 | 29.59 | 31.90 | 43.41 | a | 50.24 | b | 57.90 | a | 65.93 | b | 66.52 | b | 60.48 | g | 49.18 | c | 31.62 | i | 29.57 | h | 47.12 | c | |||
1949 | 23.29 | 28.69 | b | 33.59 | d | 43.50 | d | 50.13 | 58.79 | a | 66.39 | 61.74 | 60.34 | a | 44.53 | a | 41.00 | a | 32.52 | b | 45.38 | |||||
1950 | 30.94 | 38.46 | 39.68 | f | 49.34 | a | 52.00 | 60.17 | 66.06 | 64.17 | b | 56.54 | b | 52.81 | 44.28 | a | 41.63 | a | 50.58 | a | ||||||
1951 | 34.23 | 35.96 | 38.63 | a | 45.97 | 53.10 | 60.14 | a | 69.26 | d | 64.59 | d | 62.03 | a | 49.87 | 38.00 | 32.68 | 48.70 | ||||||||
1952 | 31.10 | b | 34.10 | 33.65 | 44.30 | 53.58 | 58.97 | 67.39 | 69.29 | 63.23 | 55.58 | 37.20 | 35.61 | c | 48.67 | |||||||||||
1953 | 37.06 | 33.79 | 39.06 | 45.00 | 48.11 | c | 61.17 | 71.50 | a | 67.16 | 63.76 | a | 52.94 | 45.60 | 33.89 | c | 49.92 | |||||||||
1954 | 35.81 | 40.89 | 37.31 | b | 49.90 | 55.94 | 60.97 | 71.87 | a | 66.30 | a | 63.60 | 55.23 | a | 45.07 | 35.65 | 51.54 | |||||||||
1955 | 32.67 | a | 30.96 | 39.48 | 41.77 | 52.26 | 60.33 | 65.00 | 67.94 | 61.50 | 56.26 | 42.29 | b | 39.58 | 49.17 | |||||||||||
1956 | 39.55 | 31.28 | 40.40 | a | 45.00 | b | 55.13 | 65.00 | 68.63 | a | 66.13 | a | 65.73 | 50.87 | 38.07 | 35.31 | b | 50.09 | ||||||||
1957 | 36.47 | a | 43.50 | 41.52 | 44.14 | a | 49.87 | 64.93 | 70.48 | 68.03 | a | 62.07 | 49.57 | a | 37.50 | 38.14 | c | 50.52 | ||||||||
1958 | 35.26 | 39.29 | 36.13 | 42.57 | 57.90 | 62.87 | 69.39 | 69.65 | 63.20 | 54.87 | 40.83 | 39.39 | 50.94 | |||||||||||||
1959 | 36.29 | 34.07 | 39.77 | 49.50 | 51.03 | 66.20 | 72.52 | b | 67.47 | a | 60.17 | 52.10 | b | 42.58 | d | 36.82 | c | 50.71 | ||||||||
1960 | 31.35 | 32.07 | 42.79 | b | 45.47 | 53.26 | 66.50 | 69.45 | 69.16 | 64.50 | 51.84 | 42.00 | 32.96 | g | 51.67 | a | ||||||||||
1961 | 37.03 | a | 38.25 | 39.58 | 46.83 | 53.16 | 67.33 | 70.77 | 69.16 | 59.10 | 50.39 | 39.71 | f | 34.55 | 51.47 | a | ||||||||||
1962 | 35.00 | a | 37.18 | 34.52 | b | 50.63 | 50.77 | 60.63 | 68.61 | 70.26 | 64.76 | a | 52.16 | 48.00 | a | 41.32 | 51.15 | |||||||||
1963 | 31.74 | 42.14 | 39.06 | 42.53 | 57.06 | 59.37 | 70.42 | 67.87 | a | 63.31 | a | 55.23 | 43.13 | 34.73 | a | 50.55 | ||||||||||
1964 | 31.42 | 32.21 | 36.29 | 43.69 | a | 51.40 | a | 61.67 | 70.71 | 66.43 | a | 61.07 | a | 56.26 | 37.10 | 34.60 | a | 48.57 | ||||||||
1965 | 36.76 | b | 34.86 | 37.32 | 44.13 | 49.14 | b | 56.62 | a | 68.84 | 65.72 | b | 56.93 | 52.27 | a | 44.77 | 36.13 | 48.62 | ||||||||
1966 | 31.50 | a | 31.93 | 41.29 | 46.83 | 57.62 | e | 61.37 | 69.19 | 69.55 | 63.60 | 50.74 | 41.93 | 34.00 | 49.96 | |||||||||||
1967 | 33.42 | 34.93 | 39.24 | b | 38.39 | b | 50.63 | a | 57.93 | a | 68.42 | 67.34 | b | 61.93 | 51.20 | a | 43.48 | a | 29.60 | a | 48.04 | |||||
1968 | 32.65 | 41.83 | 40.67 | a | 42.60 | 51.83 | b | 60.13 | 63.61 | 61.84 | 57.83 | 50.16 | 41.83 | 31.06 | 48.00 | |||||||||||
1969 | 37.97 | 32.89 | 36.06 | 44.97 | 54.71 | 58.83 | 68.26 | 68.94 | 61.73 | 47.33 | a | 41.53 | 36.17 | a | 49.12 | |||||||||||
1970 | 31.84 | 38.71 | 36.87 | 38.20 | 51.48 | 62.07 | 69.13 | 67.55 | 56.33 | 46.77 | 41.10 | 32.65 | 47.73 | |||||||||||||
1971 | 31.90 | a | 34.25 | 38.90 | 42.03 | 48.21 | b | 58.27 | 70.10 | 65.94 | 59.30 | 45.77 | 37.20 | 31.29 | 46.93 | |||||||||||
1972 | 30.35 | 35.52 | 45.23 | 45.50 | 52.74 | 60.93 | 68.77 | 65.84 | 59.14 | a | 49.90 | a | 35.53 | 30.77 | 48.35 | |||||||||||
1973 | 30.61 | 36.43 | 33.94 | 41.30 | 53.29 | 61.47 | 65.77 | 64.77 | 56.80 | 49.17 | b | 38.30 | 33.90 | 47.15 | ||||||||||||
1974 | 32.39 | 32.11 | 40.81 | 43.57 | 53.52 | 64.40 | 66.16 | 63.71 | 61.59 | c | 52.13 | 39.67 | 31.32 | 48.45 | ||||||||||||
1975 | 30.94 | 32.39 | 35.26 | 37.34 | a | 49.37 | a | 58.97 | 66.81 | 65.17 | b | 61.17 | a | 47.97 | 38.48 | c | 34.90 | 46.56 | ||||||||
1976 | 34.35 | 38.38 | 37.13 | 41.67 | 54.61 | 60.50 | 67.35 | 61.92 | g | 58.59 | a | 48.74 | 40.63 | 33.35 | 46.85 | a | ||||||||||
1977 | 33.39 | 36.82 | 34.10 | 45.07 | 47.90 | 62.60 | 67.32 | 65.74 | 59.00 | 52.26 | 42.17 | 39.52 | 48.82 | |||||||||||||
1978 | 35.97 | 36.43 | 43.39 | 42.53 | 50.52 | 61.67 | 66.68 | 64.61 | ----- | z | ----- | z | ----- | z | ----- | z | 50.22 | d | ||||||||
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | 36.37 | a | 37.47 | a | 49.33 | 53.77 | 63.43 | 64.87 | 66.76 | b | 60.17 | a | 55.19 | 39.87 | 32.00 | 50.84 | a | |||||||
1988 | 34.10 | 37.93 | 39.42 | 46.07 | 51.97 | 63.47 | 69.57 | a | 65.97 | a | 59.90 | 57.50 | a | 41.07 | 35.61 | 50.21 | ||||||||||
1989 | 33.32 | 36.69 | b | 45.19 | 52.17 | 54.55 | 62.21 | b | 69.52 | 69.11 | m | 63.23 | 52.55 | 43.00 | 34.67 | a | 49.74 | a | ||||||||
1990 | 33.26 | 32.89 | 42.71 | 49.60 | 52.39 | 65.67 | 69.23 | a | 66.55 | 63.60 | 52.42 | 42.77 | 29.23 | 50.03 | ||||||||||||
1991 | 34.42 | 40.89 | 34.61 | 44.47 | 51.48 | b | 59.50 | b | 69.15 | e | 68.80 | a | 62.90 | 55.16 | 41.29 | b | 35.47 | a | 49.85 | |||||||
1992 | 34.29 | 40.24 | 41.29 | 50.33 | 57.00 | 61.31 | a | 67.94 | 67.77 | a | 63.27 | 54.39 | 38.10 | a | 32.87 | 50.73 | ||||||||||
1993 | 36.73 | a | 36.79 | 42.19 | 48.63 | 56.35 | 62.73 | 66.84 | 67.55 | 62.30 | 52.93 | a | 38.17 | 32.74 | 50.33 | |||||||||||
1994 | 35.39 | 34.29 | 43.31 | e | 47.14 | b | 53.87 | 67.13 | 70.20 | a | 71.88 | f | 64.40 | 50.13 | a | 35.63 | c | 36.77 | a | 48.93 | a | |||||
1995 | 35.45 | 41.80 | c | 40.90 | b | 44.33 | 50.45 | 60.79 | b | 69.64 | c | 71.03 | b | 65.80 | 53.58 | 46.07 | b | 37.68 | 51.46 | |||||||
1996 | ----- | z | 40.71 | a | 40.13 | a | 48.90 | 56.68 | 65.41 | c | 72.60 | a | 70.06 | 61.38 | a | 52.21 | b | 42.00 | c | 36.71 | 53.34 | a | ||||
1997 | 36.10 | a | 35.26 | a | 44.28 | b | 45.18 | b | 60.03 | a | 61.93 | a | 68.97 | a | 70.38 | b | 65.70 | 50.64 | c | 42.46 | b | 33.40 | a | 51.19 | ||
1998 | 36.90 | 34.22 | a | 40.29 | 43.31 | a | 50.21 | b | 58.93 | a | 70.58 | 70.19 | 62.72 | a | 49.90 | a | 42.07 | 35.00 | 49.53 | |||||||
1999 | 36.94 | 36.12 | d | 40.83 | b | 41.90 | 53.63 | a | 63.07 | 69.27 | a | 68.23 | 63.20 | 54.10 | 47.28 | a | 36.22 | d | 50.90 | |||||||
2000 | 37.26 | 38.75 | a | 41.23 | 49.19 | c | 60.20 | a | 66.10 | 70.32 | 70.36 | c | 64.20 | 51.84 | 35.85 | c | 37.42 | 51.89 | ||||||||
2001 | 33.84 | 33.60 | c | 42.48 | b | 45.00 | a | 60.50 | a | 65.63 | 69.19 | d | 69.81 | 65.87 | 55.97 | 45.10 | 32.84 | 51.65 | ||||||||
2002 | 34.57 | a | 36.89 | 38.87 | 49.67 | 54.39 | 59.42 | d | 67.27 | a | 64.93 | c | 58.69 | d | 44.20 | a | 36.93 | 29.07 | d | 47.91 | ||||||
2003 | 34.48 | b | 32.04 | b | 34.73 | a | 37.93 | a | 49.50 | a | 58.23 | 68.29 | 65.03 | a | 59.07 | a | 51.50 | e | 33.93 | a | 29.71 | c | 46.20 | |||
2004 | 28.63 | a | 27.82 | a | 41.39 | 42.68 | b | 49.80 | a | 57.00 | b | 64.23 | 63.50 | a | 55.93 | a | 45.59 | b | 35.21 | a | 31.60 | a | 45.28 | |||
2005 | 26.97 | a | 23.08 | d | 32.88 | n | 39.86 | b | 50.74 | h | 58.00 | f | 67.25 | c | 65.48 | b | 58.38 | a | 48.19 | d | 37.18 | b | 28.28 | b | 43.85 | c |
2006 | 28.72 | b | 28.41 | a | 33.52 | d | 41.36 | b | 52.45 | b | 63.86 | b | 69.87 | a | 64.20 | a | 55.40 | 44.93 | a | 39.21 | a | 25.07 | a | 45.58 | ||
2007 | 26.73 | a | 32.33 | a | 38.20 | a | 44.89 | b | 52.65 | 57.78 | c | 68.77 | a | 67.16 | 59.60 | 46.16 | 39.89 | c | 27.61 | 46.81 | ||||||
2008 | 28.90 | 31.28 | 35.07 | b | 40.63 | 47.72 | b | 58.33 | 67.45 | 66.77 | 59.27 | 46.90 | 39.21 | a | 30.52 | b | 46.00 | |||||||||
2009 | 31.53 | a | 32.00 | a | 34.13 | 39.43 | 54.68 | 58.33 | 68.35 | 61.97 | b | 59.47 | 43.13 | 37.33 | 26.97 | b | 45.61 | |||||||||
2010 | 31.26 | 32.46 | 33.81 | 37.93 | a | 43.55 | 56.73 | 69.58 | 65.29 | c | 57.77 | 49.03 | 34.57 | 34.35 | 45.53 | |||||||||||
2011 | 27.00 | 26.35 | b | 35.77 | 41.43 | 45.77 | 55.60 | 65.20 | a | 67.90 | 59.23 | 47.52 | 35.90 | 28.90 | 44.72 | |||||||||||
2012 | 29.29 | 30.34 | 34.68 | 42.33 | 51.06 | 60.20 | 66.58 | 67.52 | 59.77 | 47.19 | 36.93 | 30.00 | 46.33 | |||||||||||||
2013 | 25.77 | 27.57 | 37.03 | 40.63 | 49.03 | a | 59.17 | 70.06 | 65.48 | 58.50 | 41.40 | a | 37.80 | 27.29 | 44.98 | |||||||||||
2014 | 30.55 | 32.86 | 38.77 | a | 42.77 | 51.00 | 57.47 | 67.19 | 64.16 | 63.33 | o | 47.70 | u | 37.59 | c | 36.15 | e | 45.85 | b | |||||||
2015 | 32.34 | b | 35.67 | d | 39.07 | a | 41.70 | 45.06 | 63.61 | l | 63.40 | k | 66.87 | 62.23 | 51.71 | 33.37 | 27.74 | 43.58 | b | |||||||
2016 | 29.19 | 32.24 | 37.00 | 42.67 | 48.06 | 62.23 | 66.94 | 64.84 | 55.30 | 49.62 | b | 39.60 | 30.93 | b | 46.55 | |||||||||||
2017 | 32.23 | 36.14 | 38.00 | 40.47 | 49.68 | 59.97 | 68.29 | 64.77 | a | 56.57 | 47.23 | a | 41.40 | 31.72 | b | 47.21 | ||||||||||
2018 | 33.97 | a | 31.82 | 35.97 | 45.73 | 50.57 | a | 59.21 | a | 67.57 | a | 66.29 | 59.10 | a | 49.45 | 34.19 | d | 30.08 | f | 48.53 | a | |||||
2019 | 31.26 | d | 28.92 | b | 36.74 | 41.86 | a | 44.58 | 57.79 | a | 63.37 | d | 66.17 | g | 59.38 | d | 41.97 | a | 36.44 | c | 32.24 | b | 43.14 | a | ||
2020 | 29.93 | a | 29.29 | a | 37.21 | b | 40.68 | b | 50.67 | a | 55.70 | c | 65.18 | c | 68.08 | f | 56.46 | d | 47.04 | e | 38.25 | b | 27.90 | 43.48 | a | |
2021 | 29.45 | 28.93 | 32.70 | a | 43.97 | a | 49.27 | e | 62.88 | e | 69.45 | b | 66.77 | a | 60.24 | a | 44.27 | a | 39.30 | c | 31.93 | a | 46.60 | |||
2022 | 29.06 | 27.93 | 34.42 | e | 41.83 | a | 50.77 | a | 60.86 | b | 68.60 | a | 66.23 | 62.64 | b | 47.52 | 30.77 | 31.19 | 45.98 | |||||||
2023 | 30.74 | 29.14 | 32.39 | 39.00 | a | 49.39 | 51.97 | 66.84 | 65.85 | e | 56.57 | 47.80 | a | 37.40 | 29.37 | a | 44.70 | |||||||||
2024 | 27.16 | 31.29 | a | 36.23 | 36.81 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.56 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 32.18 | 34.23 | 38.12 | 44.04 | 51.94 | 60.61 | 68.41 | 66.94 | 60.78 | 49.93 | 39.36 | 33.31 | 48.30 | |||||||||||||
S.D. | 3.25 | 4.21 | 3.15 | 3.38 | 3.45 | 3.16 | 2.09 | 2.17 | 2.81 | 3.47 | 3.44 | 3.39 | 1.98 | |||||||||||||
SKEW | -0.35 | 0.01 | 0.16 | 0.30 | 0.17 | 0.13 | -0.06 | -0.20 | -0.08 | -0.08 | 0.12 | 0.04 | 0.02 | |||||||||||||
MAX | 39.55 | 43.50 | 45.23 | 52.17 | 60.50 | 67.34 | 74.32 | 72.27 | 65.93 | 57.50 | 48.00 | 41.63 | 51.89 | |||||||||||||
MIN | 22.42 | 23.08 | 31.90 | 37.34 | 43.55 | 51.97 | 63.37 | 61.74 | 54.70 | 41.40 | 30.77 | 25.07 | 44.70 | |||||||||||||
YRS | 85 | 88 | 85 | 86 | 86 | 85 | 86 | 82 | 83 | 84 | 82 | 81 | 67 |