YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.87 | ----- | z | 29.48 | b | 38.68 | j | |
1925 | 34.89 | v | 40.18 | ----- | z | ----- | z | 54.36 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.18 | k | |
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 | 52.58 | j | 56.40 | b | 58.17 | a | 63.23 | i | ----- | z | 61.48 | d | 52.98 | i | ----- | z | ----- | z | 58.68 | i |
1940 | ----- | z | 41.16 | j | ----- | z | 50.92 | 59.57 | a | 62.57 | c | 65.18 | a | 66.32 | a | 63.82 | k | 44.83 | y | 40.17 | u | 39.95 | b | 57.42 | f | |
1941 | 38.29 | c | 43.19 | d | 50.20 | c | 51.83 | i | 56.23 | i | 61.23 | o | 68.24 | 66.78 | b | 57.29 | a | 50.40 | ----- | z | ----- | z | 53.48 | e | ||
1942 | ----- | z | ----- | z | ----- | z | 50.44 | d | 54.46 | g | 59.26 | c | 69.15 | e | ----- | z | 62.69 | c | 52.41 | d | 39.89 | k | 36.86 | c | 55.13 | f |
1943 | 30.26 | j | 38.15 | e | 41.34 | f | 51.17 | i | 53.00 | o | 60.98 | h | 67.76 | j | 68.03 | a | 67.09 | a | 53.50 | o | 42.61 | p | 38.20 | h | 57.76 | i |
1944 | 35.46 | h | 37.98 | d | 41.54 | q | 49.82 | s | 54.41 | c | 60.08 | f | 65.79 | 65.20 | a | 61.62 | b | 55.31 | w | ----- | z | ----- | z | 57.00 | g | |
1945 | 37.50 | g | 38.89 | j | 40.72 | m | 45.34 | e | 56.19 | 58.17 | l | 66.23 | 66.72 | b | ----- | z | 52.50 | x | 38.82 | p | 36.32 | i | 58.62 | h | ||
1946 | 36.55 | k | 38.36 | g | 42.94 | m | 48.74 | e | 55.53 | l | 58.23 | f | 66.94 | d | 66.60 | e | 58.30 | h | 46.12 | j | ----- | z | ----- | z | 60.76 | i |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.86 | m | 62.20 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.10 | o | 71.03 | n | 65.27 | g | 61.44 | l | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.02 | 63.53 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.77 | j | ||
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.26 | d | ----- | z | ----- | z | ----- | z | 39.35 | f | ----- | z | 71.26 | k |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | 40.83 | p | 39.60 | d | 42.79 | e | 47.75 | d | 53.07 | i | 56.69 | i | 66.91 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.38 | i |
1954 | 31.74 | l | 37.23 | 40.20 | a | 45.80 | 54.84 | 55.82 | 61.26 | b | 62.36 | b | 60.80 | o | 52.15 | g | 49.32 | m | 38.00 | v | 51.07 | e | ||||
1955 | 36.94 | m | 36.91 | l | 37.47 | m | 42.11 | k | 51.27 | p | ----- | z | 57.42 | e | 60.62 | a | ----- | z | ----- | z | 32.25 | l | 35.04 | c | 51.03 | i |
1956 | 35.05 | b | 32.24 | f | 38.03 | 48.88 | ----- | z | 56.72 | 65.72 | b | 63.40 | 58.35 | 48.76 | 41.31 | f | 38.47 | 50.38 | c | |||||||
1957 | 28.97 | b | 35.77 | 44.43 | c | 50.00 | a | 57.50 | 61.00 | c | 61.05 | 60.68 | 62.53 | a | 50.06 | 40.37 | d | 38.13 | 49.21 | |||||||
1958 | 39.36 | b | 44.29 | 41.62 | b | 46.92 | 59.68 | 64.07 | a | 69.50 | 65.26 | 59.43 | i | 52.65 | 41.14 | a | 40.95 | a | 51.40 | a | ||||||
1959 | 36.57 | a | 37.56 | a | 41.81 | 47.45 | 51.68 | a | 59.12 | e | 65.53 | b | 61.55 | c | 56.65 | g | 52.14 | b | 43.38 | 37.57 | a | 48.58 | a | |||
1960 | 34.77 | a | 39.18 | a | 41.94 | 48.36 | a | 51.40 | 59.04 | f | 65.92 | 62.28 | h | 56.61 | b | 50.41 | c | 40.62 | f | 37.92 | a | 47.39 | c | |||
1961 | 39.38 | a | 40.07 | a | 42.00 | c | 46.69 | a | 52.08 | a | 62.32 | 65.27 | 66.24 | 55.15 | 47.70 | a | 37.59 | b | 35.10 | a | 49.13 | |||||
1962 | 35.18 | 39.80 | a | 38.97 | 49.62 | 49.25 | a | 57.10 | 61.55 | 62.13 | 59.76 | a | 49.55 | c | 42.66 | e | 38.79 | j | 49.60 | a | ||||||
1963 | 31.52 | b | 43.95 | 41.18 | 45.47 | 52.92 | a | 57.34 | b | 60.52 | 62.74 | 60.11 | b | 50.03 | a | 40.31 | c | 36.65 | n | 49.64 | a | |||||
1964 | 35.54 | c | 37.34 | 39.35 | 43.62 | 49.75 | a | ----- | z | 64.66 | c | 61.79 | b | 55.91 | c | 52.90 | f | 38.76 | a | 33.31 | 46.00 | b | ||||
1965 | 33.63 | a | 37.33 | a | 41.84 | 48.47 | a | 49.66 | 58.64 | a | 64.65 | 64.63 | a | 53.55 | 51.63 | 43.88 | a | 33.07 | a | 48.41 | ||||||
1966 | 32.63 | 35.79 | 41.79 | 47.68 | 53.18 | a | 56.55 | 61.65 | 61.37 | 59.40 | 48.86 | i | 42.33 | d | 38.28 | a | 48.24 | a | ||||||||
1967 | 37.22 | a | 39.34 | 38.90 | 43.27 | 52.60 | a | 60.97 | 63.98 | 67.40 | a | 62.08 | 51.98 | e | ----- | z | 34.14 | m | 51.77 | b | ||||||
1968 | 35.95 | j | 44.62 | i | 45.95 | j | 46.05 | k | 55.00 | i | 59.45 | a | 65.27 | 62.32 | 58.87 | 50.30 | d | 42.24 | k | 34.33 | k | 59.24 | g | |||
1969 | 28.61 | l | 36.64 | j | 43.14 | m | 48.00 | j | 57.54 | h | 64.07 | a | 62.63 | a | 61.05 | 59.02 | 49.30 | i | 44.17 | o | 39.53 | l | 61.69 | h | ||
1970 | 36.83 | m | 43.03 | i | 43.02 | i | 44.50 | h | 54.75 | g | 62.05 | 64.79 | 64.90 | 56.38 | 48.70 | c | 41.69 | l | 32.63 | p | 59.36 | g | ||||
1971 | 32.78 | m | 38.43 | m | 38.69 | o | 46.20 | g | 54.76 | l | 53.86 | i | 65.70 | a | 67.26 | 55.50 | 47.36 | j | 39.21 | k | 32.20 | p | 62.82 | i | ||
1972 | 30.74 | l | 35.23 | i | 43.57 | h | 44.95 | k | 55.46 | f | 59.39 | h | 63.94 | 63.79 | c | 53.48 | 48.26 | d | 39.81 | l | 28.80 | a | 51.65 | g | ||
1973 | 31.77 | g | 40.10 | m | 41.20 | k | 46.34 | b | 52.95 | 57.11 | g | 63.21 | b | 60.68 | 60.83 | 49.02 | 36.50 | a | 39.32 | 51.11 | d | |||||
1974 | 32.29 | 39.04 | d | 41.87 | a | 46.42 | 50.90 | a | 60.55 | 63.08 | 64.23 | 62.21 | a | 50.17 | k | ----- | z | 38.32 | a | 49.89 | b | |||||
1975 | 35.45 | 37.00 | d | 39.87 | 43.62 | 55.18 | c | 56.20 | 64.58 | a | 61.47 | ----- | z | 47.39 | 40.22 | a | 39.23 | 47.29 | a | |||||||
1976 | 38.09 | b | 37.95 | 39.24 | b | 47.16 | b | 53.95 | 56.38 | 63.79 | 60.65 | 59.85 | 50.69 | b | 43.02 | d | 38.39 | 49.10 | ||||||||
1977 | 33.83 | b | 42.95 | 40.27 | 51.07 | 50.93 | a | 61.37 | 63.10 | 68.25 | a | 56.37 | 49.66 | 37.96 | b | 36.83 | a | 49.38 | ||||||||
1978 | 37.97 | 41.62 | 45.16 | 47.60 | 52.15 | a | 62.43 | 65.71 | b | 64.53 | 55.30 | b | 51.81 | 36.45 | 30.69 | 49.29 | ||||||||||
1979 | 30.77 | 34.54 | 44.48 | 48.09 | a | 55.89 | 61.05 | b | 67.11 | 64.84 | 62.20 | 52.03 | 40.15 | 39.48 | c | 50.05 | ||||||||||
1980 | 29.65 | 38.53 | 41.12 | a | 51.60 | 54.02 | 56.82 | 65.75 | a | 62.27 | 59.07 | 53.08 | 43.38 | a | 40.50 | b | 49.65 | |||||||||
1981 | 43.29 | 41.38 | b | 47.13 | 49.22 | 54.68 | 58.58 | 66.22 | b | 71.69 | d | 61.12 | 49.13 | a | 43.20 | 36.85 | a | 51.87 | ||||||||
1982 | 33.43 | b | 37.78 | e | 42.62 | e | 46.04 | g | 54.94 | g | 64.80 | h | 65.21 | g | 66.86 | f | 59.50 | g | 51.05 | j | 39.14 | b | 36.09 | c | 37.81 | g |
1983 | 39.56 | d | 42.12 | b | 46.17 | a | 49.43 | c | 58.85 | a | 59.78 | g | 63.05 | j | 68.33 | h | 57.13 | g | 50.82 | a | 42.47 | a | 29.97 | b | 44.92 | d |
1984 | 38.02 | a | 41.10 | 46.66 | 46.32 | 52.18 | 60.57 | c | 67.23 | 66.08 | 58.07 | a | 47.44 | 40.20 | 32.83 | a | 49.72 | |||||||||
1985 | 34.05 | 34.43 | 42.00 | 48.76 | a | 56.45 | b | 61.78 | c | 72.03 | a | 64.66 | 56.16 | a | 48.50 | 32.73 | b | 32.98 | 48.71 | |||||||
1986 | 39.73 | a | 38.45 | 46.35 | a | 47.36 | b | 56.22 | b | 63.50 | b | 61.43 | c | 69.60 | b | 57.28 | 52.55 | a | 42.28 | 36.95 | a | 50.98 | ||||
1987 | 33.80 | a | 41.77 | 43.97 | 49.57 | a | 55.79 | 61.57 | a | 62.53 | 65.21 | 61.57 | 53.15 | 44.72 | 33.98 | 50.63 | ||||||||||
1988 | 35.37 | 40.64 | a | 41.64 | c | 47.34 | b | 53.47 | a | 59.24 | a | 63.11 | 64.34 | 58.86 | a | 55.21 | c | 40.61 | c | 37.25 | a | 49.76 | ||||
1989 | 36.10 | b | 32.80 | 40.65 | a | 50.18 | 52.50 | a | ----- | z | 62.56 | 62.65 | 59.68 | b | 49.94 | 42.62 | b | 39.25 | a | 48.09 | a | |||||
1990 | 37.44 | 35.16 | 45.40 | a | 51.15 | 53.07 | b | 59.52 | b | 68.14 | c | 65.83 | b | 63.03 | 46.98 | a | 42.50 | 28.79 | b | 49.75 | ||||||
1991 | 34.61 | 43.93 | 41.15 | a | 45.69 | a | 52.69 | b | 57.31 | a | 66.60 | a | 66.26 | 61.67 | a | 50.31 | b | 42.29 | a | 38.68 | c | 50.10 | ||||
1992 | 39.09 | d | 45.12 | a | 48.13 | 50.56 | c | 57.83 | a | 63.07 | 65.25 | a | 65.00 | 57.20 | c | 51.90 | a | 41.36 | b | 35.07 | c | 51.63 | ||||
1993 | 32.96 | c | 38.29 | b | 45.16 | b | 46.64 | b | 57.98 | e | 58.02 | e | 59.34 | 63.20 | c | 59.36 | a | 53.12 | b | 36.77 | b | 35.87 | a | 48.89 | ||
1994 | 40.26 | 36.69 | b | 45.22 | a | 50.54 | b | 55.84 | c | 57.59 | a | 65.37 | a | 64.12 | a | 61.41 | b | 49.02 | c | 36.93 | b | 33.66 | c | 49.72 | ||
1995 | 41.71 | c | 41.98 | a | 43.98 | 46.40 | a | 55.36 | b | 58.50 | b | 65.18 | a | 60.90 | b | 61.58 | 48.69 | d | 44.70 | c | 36.52 | b | 50.46 | |||
1996 | 35.53 | 37.95 | a | 43.23 | c | 47.41 | c | 50.18 | a | 58.07 | 66.24 | 64.13 | a | 55.55 | b | 49.59 | c | 40.26 | a | 34.84 | b | 48.58 | ||||
1997 | 36.14 | b | 39.60 | b | 41.16 | c | 46.22 | c | 55.72 | a | 58.17 | a | 63.17 | b | 65.60 | 60.75 | b | 47.68 | c | 44.28 | 37.50 | a | 49.67 | |||
1998 | 36.21 | 41.75 | 43.90 | 49.25 | 52.76 | d | 59.31 | a | 67.78 | b | 65.97 | 62.38 | f | 49.88 | c | 42.32 | b | 34.70 | a | 49.44 | a | |||||
1999 | 37.08 | a | 37.38 | b | 41.73 | a | 45.98 | b | 49.68 | a | 56.91 | b | 62.11 | 64.50 | a | 59.47 | 49.07 | b | 43.73 | b | 38.33 | d | 48.83 | |||
2000 | 35.43 | a | 40.78 | 42.05 | 50.62 | b | 52.74 | b | 59.16 | b | 63.37 | ----- | z | 58.24 | e | 49.93 | d | 38.48 | b | 37.33 | a | 48.01 | a | |||
2001 | 38.85 | d | 38.50 | 43.74 | 45.55 | a | 54.61 | d | 55.98 | a | 62.22 | a | 64.94 | 60.02 | c | 47.61 | d | 42.93 | a | 35.93 | b | 49.24 | ||||
2002 | 36.60 | e | 39.21 | b | 39.16 | b | 47.66 | b | 51.83 | b | 59.83 | a | 65.38 | b | 63.95 | a | 58.50 | 50.20 | c | 44.90 | a | 38.04 | c | 49.60 | ||
2003 | 41.77 | c | 40.38 | 42.70 | c | 47.00 | c | 52.70 | d | 61.71 | a | 65.82 | 65.10 | b | 61.96 | d | 52.48 | e | 38.45 | a | 37.56 | d | 50.64 | |||
2004 | 35.20 | f | 41.20 | a | 46.80 | f | 51.57 | a | 54.52 | c | 61.05 | b | 67.55 | 66.21 | b | 57.90 | e | 52.22 | f | 42.02 | c | 40.71 | c | 53.64 | c | |
2005 | 40.72 | d | 41.81 | a | 46.98 | a | 48.88 | b | 57.52 | c | 59.28 | a | 66.00 | a | 66.84 | c | 58.17 | d | 53.30 | c | 40.54 | b | 36.97 | a | 51.42 | |
2006 | 39.28 | f | 37.80 | c | 41.93 | a | 48.21 | d | 55.25 | a | 61.05 | 66.37 | a | 64.19 | 59.67 | a | 49.73 | 40.63 | 36.55 | b | 51.04 | a | ||||
2007 | 35.03 | b | 40.30 | 45.71 | b | 48.88 | 56.13 | 60.05 | 69.45 | a | 66.29 | 59.80 | 49.03 | 42.28 | a | 35.40 | 50.70 | |||||||||
2008 | 33.92 | 40.40 | 41.52 | h | 44.33 | g | 56.43 | j | 56.91 | g | 66.20 | h | 65.62 | a | 60.12 | 49.50 | 46.17 | 33.94 | 47.09 | e | ||||||
2009 | 36.74 | 39.54 | 39.66 | 47.68 | 55.09 | b | 61.42 | 69.13 | 65.39 | 60.90 | 49.08 | 41.87 | 32.79 | 49.94 | ||||||||||||
2010 | 42.02 | 43.09 | 44.53 | 46.42 | 49.79 | b | 56.52 | 64.55 | 65.89 | 60.02 | 50.84 | 38.78 | 37.00 | 49.95 | ||||||||||||
2011 | 36.23 | 35.36 | 39.73 | 41.90 | 49.58 | 56.50 | 60.82 | 64.40 | 61.50 | 49.31 | 38.52 | 34.97 | 47.40 | |||||||||||||
2012 | 34.27 | 39.03 | 39.45 | 48.08 | 52.23 | 56.02 | 64.40 | 66.19 | 59.75 | 48.79 | 41.93 | 35.71 | 48.82 | |||||||||||||
2013 | 33.77 | 38.46 | 42.37 | 45.88 | 54.37 | 60.05 | 65.71 | 66.82 | 61.13 | 49.37 | 41.75 | 34.29 | 49.50 | |||||||||||||
2014 | 39.69 | 37.12 | 44.26 | 49.48 | 57.56 | 59.30 | 68.95 | 68.92 | 62.68 | 55.58 | 42.28 | 41.48 | 52.28 | |||||||||||||
2015 | 40.74 | 46.25 | 48.32 | 49.32 | 57.87 | 66.23 | 69.32 | 66.53 | 59.17 | 55.90 | 41.50 | 36.53 | 53.14 | |||||||||||||
2016 | 35.81 | 44.48 | 46.08 | 54.80 | 58.40 | 62.03 | 66.26 | 66.81 | 58.90 | 52.50 | 47.93 | 32.63 | 52.22 | |||||||||||||
2017 | 30.27 | 35.91 | 42.63 | 47.57 | 56.53 | 62.12 | 66.10 | 68.00 | 62.15 | 47.24 | 41.37 | 36.02 | 49.66 | |||||||||||||
2018 | 39.32 | 38.59 | 42.61 | 48.18 | 59.69 | 60.95 | 70.10 | 68.19 | 59.68 | 52.08 | 44.78 | 38.65 | 51.90 | |||||||||||||
2019 | 39.85 | 35.04 | 42.60 | 50.12 | 58.39 | 61.90 | 66.00 | a | 68.27 | 59.35 | 48.65 | 42.63 | 39.31 | 51.01 | ||||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 36.34 | 39.36 | 42.84 | 47.99 | 54.31 | 59.68 | 65.15 | 64.92 | 59.45 | 50.34 | 41.29 | 36.19 | 50.02 | |||||||||||||
S.D. | 3.25 | 2.86 | 2.68 | 2.26 | 2.84 | 2.41 | 2.78 | 2.40 | 2.52 | 2.09 | 2.74 | 2.97 | 1.22 | |||||||||||||
SKEW | -0.08 | 0.18 | 0.50 | -0.01 | 0.06 | 0.28 | -0.03 | 0.04 | -0.12 | 0.67 | -0.49 | -0.67 | 0.56 | |||||||||||||
MAX | 43.29 | 46.25 | 50.20 | 54.80 | 59.69 | 66.23 | 72.03 | 71.69 | 67.09 | 55.90 | 47.93 | 41.48 | 53.14 | |||||||||||||
MIN | 28.97 | 32.80 | 38.03 | 41.90 | 49.25 | 55.82 | 57.42 | 60.62 | 53.48 | 46.98 | 32.73 | 28.79 | 47.40 | |||||||||||||
YRS | 57 | 63 | 59 | 63 | 61 | 60 | 71 | 68 | 63 | 60 | 55 | 61 | 39 |