YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.40 | 65.23 | ----- | z | 53.63 | 40.40 | a | 35.07 | 29.74 | 47.08 | f | |||||
1924 | 23.87 | 28.59 | 33.55 | 37.93 | 48.77 | 60.89 | c | 64.88 | e | 63.50 | e | 57.42 | d | 45.75 | c | 32.29 | b | 21.48 | d | 43.24 | ||||||
1925 | 11.64 | c | 21.58 | d | 34.21 | b | 40.03 | 49.97 | 58.73 | 62.45 | 58.97 | 50.87 | 42.97 | 28.63 | ----- | z | 41.82 | a | ||||||||
1926 | ----- | z | 34.93 | 41.00 | a | 53.37 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.10 | i | ||
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 | 32.89 | s | 40.58 | e | 49.35 | d | 64.04 | d | 76.00 | e | 61.52 | d | 64.63 | d | 57.59 | c | 45.52 | d | 27.00 | d | 21.56 | d | 50.78 | b |
1930 | 27.11 | d | 29.12 | d | 32.58 | e | 42.35 | d | 44.96 | d | 56.77 | d | 62.37 | d | 58.96 | e | 47.37 | 32.91 | t | 32.44 | c | 24.23 | e | 41.66 | a | |
1931 | 23.12 | e | 32.96 | e | 31.46 | e | 39.81 | d | 47.00 | f | 57.54 | d | 63.23 | e | 60.31 | e | 57.80 | e | 44.37 | d | 30.27 | d | 24.54 | e | 42.31 | a |
1932 | 20.08 | f | 29.96 | e | 29.89 | d | 35.77 | d | 45.71 | g | 52.04 | d | 61.84 | f | 60.70 | d | 52.88 | e | 40.88 | e | 26.56 | e | 25.19 | e | 39.32 | c |
1933 | 23.04 | f | 22.35 | e | 31.85 | d | 34.76 | e | 41.73 | e | 56.19 | d | 61.28 | f | 61.30 | d | 57.76 | e | 47.04 | e | 30.84 | e | 23.32 | f | 42.65 | c |
1934 | 18.58 | e | 29.48 | e | 36.81 | d | 43.88 | e | 53.20 | a | 56.69 | a | 62.65 | 62.23 | 54.54 | b | 43.52 | 32.17 | 28.33 | a | 43.51 | |||||
1935 | 28.93 | a | 30.50 | 33.74 | 42.10 | 45.06 | 57.17 | 65.74 | 62.03 | 54.60 | 44.35 | 31.80 | 28.16 | 43.68 | ||||||||||||
1936 | 23.29 | 29.96 | a | 36.26 | 41.37 | 52.46 | e | 60.20 | 64.84 | 63.19 | 57.37 | 45.03 | 34.10 | a | 29.10 | a | 44.76 | |||||||||
1937 | 25.06 | 31.18 | 34.13 | 44.90 | a | 53.10 | 59.57 | 65.23 | a | 63.55 | 59.53 | 49.27 | a | 34.67 | 31.26 | 45.95 | ||||||||||
1938 | 29.35 | 32.32 | 37.42 | 41.24 | a | 51.16 | 60.87 | 62.77 | 62.90 | 55.43 | 48.94 | 28.07 | a | 28.42 | 44.91 | |||||||||||
1939 | 24.83 | a | 23.29 | 32.52 | 42.93 | 49.94 | 59.40 | 64.52 | 61.65 | 57.00 | 41.32 | 36.57 | 29.29 | 43.60 | ||||||||||||
1940 | 26.90 | 30.17 | 34.84 | 41.50 | d | 49.65 | 59.37 | 61.90 | 61.68 | 59.07 | 47.10 | 30.70 | 34.23 | 44.76 | ||||||||||||
1941 | 31.06 | 37.68 | 36.52 | 39.10 | 49.97 | 57.17 | 63.90 | 62.77 | 57.70 | 46.32 | 35.20 | 30.65 | 45.67 | |||||||||||||
1942 | 28.45 | 28.00 | 31.71 | 41.40 | 45.94 | 56.10 | 65.16 | 63.13 | 57.57 | 53.64 | t | 36.40 | e | 31.19 | 44.10 | a | ||||||||||
1943 | 32.39 | 32.61 | 38.00 | 44.27 | 51.48 | 60.37 | 65.81 | 65.29 | 57.33 | 44.90 | 30.27 | 29.29 | 46.00 | |||||||||||||
1944 | 21.45 | 30.86 | 32.58 | 37.93 | 48.84 | 56.73 | 64.42 | 63.77 | 56.73 | 48.29 | 34.67 | 25.61 | 43.49 | |||||||||||||
1945 | 26.52 | 29.11 | 30.26 | 38.03 | 48.48 | 53.43 | 61.65 | ----- | z | 55.77 | 44.97 | 29.57 | 21.10 | 39.90 | a | |||||||||||
1946 | 23.97 | 25.31 | l | 33.42 | 44.47 | 48.03 | b | 58.20 | 60.39 | 61.19 | 48.60 | 44.40 | a | ----- | z | ----- | z | 46.96 | c | |||||||
1947 | ----- | z | ----- | z | 32.39 | 35.54 | d | ----- | z | ----- | z | 63.00 | 63.46 | g | 58.10 | 44.76 | j | ----- | z | 21.30 | d | 42.06 | g | |||
1948 | 22.46 | e | 28.30 | f | 30.56 | d | 39.38 | d | 48.27 | e | 58.96 | d | 64.07 | d | 61.62 | g | 57.04 | d | 46.58 | e | ----- | z | ----- | z | 45.92 | d |
1949 | 22.28 | f | 27.62 | d | 33.30 | d | 41.44 | e | 46.27 | e | 56.04 | d | 61.88 | f | 59.81 | d | 57.29 | i | 38.62 | j | 32.30 | j | 23.33 | j | 44.08 | f |
1950 | 24.50 | o | 27.26 | i | 32.09 | h | 40.60 | j | 44.18 | i | 57.00 | m | 62.90 | k | 56.48 | h | 54.30 | j | 48.82 | i | 32.80 | j | 25.30 | k | ----- | z |
1951 | 24.09 | i | 25.00 | i | 31.50 | i | 38.48 | i | 47.73 | i | 56.12 | v | 65.59 | i | 62.70 | h | 55.00 | l | 46.00 | h | 32.43 | i | 28.85 | k | ----- | z |
1952 | 28.05 | i | 23.40 | i | 28.48 | j | 40.32 | h | 51.24 | j | 59.86 | i | 62.64 | i | 62.00 | j | 54.43 | i | 42.04 | h | 27.11 | k | 23.81 | j | ----- | z |
1953 | 25.52 | j | 25.60 | h | 34.05 | i | 40.32 | h | 42.62 | j | 57.64 | e | 63.39 | h | 59.47 | l | 50.10 | i | 41.32 | i | 30.75 | j | 17.16 | l | 57.64 | k |
1954 | 27.32 | l | 28.84 | i | 34.82 | i | 42.55 | h | 48.90 | j | 55.45 | h | 63.18 | i | 59.68 | i | 55.52 | i | 46.71 | j | 31.33 | i | 22.35 | h | ----- | z |
1955 | 21.24 | j | 20.95 | i | 33.40 | f | 35.73 | 45.36 | c | 55.21 | b | 61.41 | b | 60.42 | 50.61 | b | 44.37 | a | 30.12 | d | 24.97 | 45.35 | c | |||
1956 | 26.10 | 20.97 | 29.32 | 35.63 | c | 43.29 | 58.60 | 59.29 | c | 56.11 | c | 51.00 | a | 41.14 | c | 25.37 | c | 24.07 | b | 39.24 | ||||||
1957 | 33.80 | a | 35.62 | d | 34.05 | i | 38.71 | i | ----- | z | 64.75 | v | 62.16 | 60.16 | 49.64 | b | 43.77 | a | 27.61 | b | 20.81 | o | 44.68 | e | ||
1958 | 23.30 | a | 31.56 | a | 33.45 | 38.61 | b | 51.57 | a | 61.40 | 63.57 | h | 62.41 | b | 57.48 | c | 46.16 | 32.37 | ----- | z | 43.83 | b | ||||
1959 | 18.19 | o | 17.00 | b | 29.40 | a | 42.14 | b | 46.75 | c | 55.21 | p | 62.33 | a | 61.52 | b | 51.61 | b | 41.71 | c | 31.82 | b | 28.34 | b | 41.26 | b |
1960 | 22.93 | a | 24.92 | d | 33.47 | a | 41.00 | a | 44.53 | a | 58.25 | f | 60.90 | k | ----- | z | 54.00 | j | 40.81 | j | 30.81 | i | 22.09 | i | 33.37 | g |
1961 | 27.59 | i | 24.95 | i | 33.27 | i | 41.40 | j | 49.50 | i | 60.09 | h | 62.70 | k | 60.91 | h | 55.16 | k | 39.36 | i | 31.86 | i | 27.64 | f | ----- | z |
1962 | 24.19 | 31.89 | 29.94 | 43.53 | 48.10 | 53.80 | 63.45 | 60.81 | 58.80 | 46.97 | 36.87 | 30.90 | 44.10 | |||||||||||||
1963 | 24.81 | 29.00 | 33.55 | 39.50 | 49.81 | 55.03 | 64.74 | 61.45 | 56.30 | 44.97 | 34.03 | 22.58 | 42.98 | |||||||||||||
1964 | 19.45 | 20.14 | 32.58 | 40.30 | 47.61 | 56.63 | 64.06 | 61.35 | 55.47 | 43.45 | 30.27 | 25.77 | 41.42 | |||||||||||||
1965 | 27.42 | 25.11 | 31.06 | 39.50 | 46.94 | 52.90 | 62.35 | 60.32 | 53.40 | 39.29 | 36.43 | 29.00 | 41.98 | |||||||||||||
1966 | 21.03 | 22.79 | 32.48 | 39.87 | 49.71 | 57.23 | 64.39 | 62.55 | 56.43 | 42.35 | 36.37 | 24.45 | 42.47 | |||||||||||||
1967 | 20.48 | 29.93 | 36.61 | 40.63 | 46.77 | 57.10 | 65.23 | 60.87 | 56.40 | 44.52 | 34.50 | 27.42 | 43.37 | |||||||||||||
1968 | 28.42 | 34.83 | 37.94 | 40.27 | 48.65 | 57.47 | 61.19 | 59.03 | 53.10 | 43.32 | 33.67 | 23.03 | 43.41 | |||||||||||||
1969 | 30.00 | 28.86 | 28.52 | 41.10 | 47.69 | b | 56.52 | i | 65.86 | c | 64.89 | c | 57.29 | f | 42.55 | i | 33.30 | c | 27.87 | 40.90 | c | |||||
1970 | 24.54 | c | 30.56 | l | 34.55 | b | 36.82 | b | 48.45 | i | 57.81 | c | 64.77 | 60.90 | 55.00 | c | 41.25 | o | 33.13 | g | 27.44 | d | 45.23 | d | ||
1971 | 25.55 | 25.71 | n | 33.68 | c | 38.90 | i | 46.55 | k | 56.04 | b | 64.61 | h | 61.25 | s | ----- | z | ----- | z | 29.94 | m | 29.81 | d | 36.27 | h | |
1972 | 24.72 | m | 28.24 | 39.10 | b | 40.23 | d | 47.52 | 57.68 | e | 64.14 | j | 60.65 | h | 59.50 | t | 48.48 | 28.85 | j | 25.81 | d | 41.01 | e | |||
1973 | 25.07 | b | 30.08 | c | 31.66 | b | 35.64 | h | 47.15 | e | 56.46 | b | 61.75 | c | 58.57 | a | 53.86 | i | 40.87 | 32.03 | a | 21.61 | c | 40.53 | b | |
1974 | 26.06 | 21.18 | 36.58 | 40.90 | 49.42 | g | 60.73 | 62.39 | 61.17 | h | 51.75 | r | 47.03 | 33.96 | c | 23.87 | 39.19 | c | ||||||||
1975 | 25.45 | 28.43 | 33.52 | 35.80 | 41.83 | h | 54.27 | 61.36 | q | 61.55 | 54.53 | 42.06 | 30.87 | 27.06 | 39.35 | b | ||||||||||
1976 | 23.90 | 33.03 | 33.23 | 40.11 | c | ----- | z | 58.20 | j | 62.23 | 60.03 | 54.93 | 41.23 | 29.10 | i | 22.45 | 41.24 | c | ||||||||
1977 | 27.16 | 28.04 | 28.81 | 41.43 | 45.71 | 56.63 | 63.87 | 63.84 | 57.03 | 48.16 | 33.67 | 28.67 | a | 43.58 | ||||||||||||
1978 | 30.94 | 29.79 | 37.81 | 40.20 | 48.00 | 57.13 | 62.58 | 60.35 | 56.50 | 45.19 | 39.07 | 25.23 | 44.40 | |||||||||||||
1979 | 28.74 | 30.39 | 31.84 | 39.90 | 48.55 | 57.30 | 63.19 | 58.71 | 55.57 | 46.13 | 28.13 | 26.55 | 42.92 | |||||||||||||
1980 | 30.39 | 33.00 | 33.94 | 39.97 | 47.19 | 59.17 | 65.42 | 61.00 | 56.07 | 40.00 | a | 30.30 | 28.23 | 43.72 | ||||||||||||
1981 | 30.87 | 30.75 | 35.61 | 43.37 | 50.00 | 60.07 | 63.61 | 61.19 | 55.97 | 45.13 | 33.77 | 27.68 | 44.83 | |||||||||||||
1982 | 29.84 | 30.07 | 33.87 | 40.67 | 47.26 | 55.40 | 63.48 | 63.23 | 57.73 | 41.16 | 35.37 | 28.03 | 43.84 | |||||||||||||
1983 | 26.16 | 30.96 | 34.94 | 35.60 | 46.19 | 54.83 | 62.29 | 62.65 | 60.37 | 48.55 | 33.87 | 29.71 | 43.84 | |||||||||||||
1984 | 26.74 | 23.10 | 31.90 | 35.80 | 50.71 | 58.13 | 62.32 | 61.32 | 55.60 | 45.61 | 32.80 | 32.84 | 43.07 | |||||||||||||
1985 | 27.00 | 26.61 | 34.87 | 40.13 | 49.35 | 57.93 | 62.90 | 60.84 | 53.13 | 44.94 | 34.00 | 23.06 | 42.90 | |||||||||||||
1986 | 23.97 | 30.61 | 34.13 | 41.67 | 47.39 | 57.07 | 60.27 | i | 61.50 | e | 52.47 | 41.35 | 31.27 | 27.42 | 40.80 | a | ||||||||||
1987 | 22.55 | 28.32 | 30.61 | 39.30 | 46.30 | a | 55.83 | 60.32 | 61.00 | 53.17 | 47.42 | 29.30 | 23.42 | 41.46 | ||||||||||||
1988 | 24.61 | 28.48 | 28.03 | 37.50 | 45.65 | 56.43 | 62.52 | 61.03 | 51.13 | 46.23 | 30.30 | 24.35 | 41.36 | |||||||||||||
1989 | 23.87 | 33.32 | 35.81 | 42.17 | 48.03 | 55.53 | 64.00 | 62.77 | 55.00 | 43.65 | 32.60 | 21.19 | 43.16 | |||||||||||||
1990 | 23.87 | 27.00 | 35.52 | 43.57 | 47.94 | 61.83 | 64.35 | 60.35 | 58.87 | 41.58 | 34.28 | a | 26.10 | 43.77 | ||||||||||||
1991 | 27.48 | 31.64 | 31.77 | 36.53 | 44.48 | 52.17 | 62.81 | 62.13 | 54.97 | 42.06 | 29.83 | a | 29.68 | 42.13 | ||||||||||||
1992 | 26.16 | 31.31 | 34.55 | 40.60 | 49.74 | 52.67 | 60.61 | 60.52 | 54.70 | 43.42 | 25.87 | 30.03 | a | 42.51 | ||||||||||||
1993 | 34.16 | 30.36 | 31.87 | 37.17 | 49.06 | 54.93 | 64.48 | 64.03 | 55.31 | a | 43.13 | 30.13 | 26.19 | 43.40 | ||||||||||||
1994 | 20.73 | a | 28.25 | 36.74 | 40.37 | 47.81 | 62.97 | 65.61 | 65.55 | 57.63 | 45.55 | 35.50 | 32.06 | 44.90 | ||||||||||||
1995 | 29.45 | 35.36 | 33.94 | 34.07 | 45.45 | 54.53 | 62.55 | 64.58 | 58.30 | 43.42 | 35.10 | 27.06 | 43.65 | |||||||||||||
1996 | 24.71 | 34.07 | 33.35 | 40.73 | 51.61 | 59.67 | 65.90 | 62.39 | 55.73 | 43.94 | 33.37 | 24.32 | 44.15 | |||||||||||||
1997 | 27.42 | 28.07 | 34.03 | 39.57 | 52.19 | 56.10 | 63.23 | 63.90 | 60.83 | 42.00 | 33.43 | 24.71 | 43.79 | |||||||||||||
1998 | 25.71 | 28.71 | 32.71 | 35.13 | 48.45 | 56.40 | 65.94 | 63.81 | 61.23 | 47.68 | c | ----- | z | 30.71 | 45.13 | a | ||||||||||
1999 | 28.29 | 30.46 | 36.42 | 39.87 | 51.87 | 57.70 | 64.71 | 63.75 | w | 60.21 | a | 47.61 | 39.67 | 30.52 | 44.30 | a | ||||||||||
2000 | 32.68 | 35.96 | a | 38.06 | 49.23 | 57.97 | 63.79 | b | 67.58 | 64.97 | b | 61.80 | 49.57 | a | 33.20 | 30.65 | 48.79 | |||||||||
2001 | 29.58 | 32.63 | a | 38.68 | 43.37 | 56.87 | a | 65.00 | 66.41 | b | 63.43 | a | 60.30 | 51.79 | b | 41.30 | 27.26 | 48.05 | ||||||||
2002 | 30.53 | a | 32.37 | a | 37.16 | 50.03 | 53.71 | 64.00 | b | 67.32 | 65.17 | a | 59.37 | 45.77 | a | 37.50 | b | 30.55 | 47.79 | |||||||
2003 | 33.93 | c | 35.82 | 37.83 | a | 45.21 | a | 55.87 | 63.30 | 68.45 | 66.35 | 61.03 | 53.06 | 39.31 | a | 33.57 | q | 50.93 | a | |||||||
2004 | 34.81 | e | 31.69 | 44.65 | 46.03 | 54.74 | 62.73 | 65.94 | 63.87 | 58.37 | 49.38 | b | 37.78 | c | 30.35 | 48.36 | ||||||||||
2005 | 35.23 | 38.04 | a | 37.07 | a | 43.97 | a | 54.61 | 62.13 | 68.16 | 65.03 | 62.40 | 50.39 | 38.97 | 31.70 | a | 48.97 | |||||||||
2006 | 32.00 | a | 36.39 | 39.68 | 46.87 | 53.20 | a | 59.72 | e | 67.83 | a | 63.19 | e | 56.63 | 48.00 | 38.47 | 28.16 | 47.51 | ||||||||
2007 | 28.71 | 27.39 | 38.70 | a | 44.89 | b | 55.77 | 64.57 | 64.53 | a | 64.41 | d | 61.59 | a | 49.24 | b | 42.24 | a | 29.57 | a | 47.63 | |||||
2008 | 32.10 | 33.77 | c | 38.06 | 43.73 | 52.90 | a | 63.30 | 65.42 | 63.39 | c | 57.37 | c | 47.00 | e | 37.86 | b | 32.17 | a | 47.26 | ||||||
2009 | 32.00 | 34.86 | 41.06 | 44.08 | d | 58.27 | a | 60.73 | d | 68.21 | b | 65.30 | d | 58.84 | e | 48.59 | d | 39.11 | b | 30.68 | 48.48 | |||||
2010 | 29.35 | e | 32.81 | b | 35.23 | 43.97 | a | 50.23 | a | 58.67 | 61.92 | f | 62.35 | e | 55.50 | j | 36.39 | h | 28.82 | b | 32.77 | 41.58 | c | |||
2011 | 27.71 | 26.85 | a | 40.47 | a | 48.30 | c | 50.59 | d | 65.11 | c | 68.68 | 67.39 | c | 61.26 | g | 47.66 | b | 37.13 | 29.87 | a | 46.34 | a | |||
2012 | 31.90 | 33.74 | b | 37.71 | 45.79 | a | 54.83 | b | 65.53 | 66.10 | 66.82 | c | 59.10 | 49.18 | i | 41.50 | 31.27 | e | 48.57 | a | ||||||
2013 | 26.62 | g | 28.80 | h | 43.12 | n | 46.61 | l | 54.47 | p | 66.65 | g | 65.93 | q | 65.68 | l | 60.76 | e | 47.05 | k | 39.63 | c | 30.71 | g | 50.19 | j |
2014 | 30.94 | o | 37.50 | p | 43.38 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.00 | c | 36.27 | 33.29 | 39.52 | i | ||
2015 | 30.00 | 36.35 | b | 43.00 | 45.10 | 50.62 | b | 66.10 | 66.48 | 66.39 | 61.73 | d | 51.87 | a | 37.53 | 29.53 | a | 48.73 | ||||||||
2016 | 30.06 | 33.83 | 41.35 | 43.54 | d | 52.42 | 65.96 | b | 68.26 | 63.27 | a | 59.64 | b | 52.38 | b | 39.61 | b | 34.03 | a | 48.70 | ||||||
2017 | 32.68 | 35.96 | 43.74 | 45.63 | c | 48.90 | a | 65.52 | a | 66.68 | 64.50 | c | 59.88 | e | 50.29 | 45.10 | 32.90 | 49.32 | ||||||||
2018 | 32.81 | 36.75 | 39.90 | a | 50.72 | a | 56.03 | a | 65.90 | 65.29 | 67.03 | 61.43 | 49.81 | 36.33 | 33.74 | 49.65 | ||||||||||
2019 | 30.58 | 32.96 | 39.87 | 46.57 | 51.00 | 62.90 | 67.23 | 67.42 | 63.10 | 47.97 | 38.83 | 32.35 | 48.40 | |||||||||||||
2020 | 31.94 | 32.97 | 41.16 | 46.23 | 56.65 | 61.83 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.79 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.19 | 30.20 | 35.02 | 41.47 | 49.83 | 58.87 | 64.19 | 62.49 | 56.63 | 45.58 | 33.91 | 27.82 | 44.78 | |||||||||||||
S.D. | 4.27 | 4.32 | 3.67 | 3.93 | 3.90 | 4.02 | 2.13 | 2.26 | 3.33 | 3.19 | 4.10 | 3.50 | 2.49 | |||||||||||||
SKEW | -0.53 | -0.68 | 0.43 | 0.49 | 0.87 | 1.15 | 0.16 | 0.08 | -0.45 | 0.18 | 0.19 | -0.22 | 0.41 | |||||||||||||
MAX | 35.23 | 38.04 | 44.65 | 53.37 | 64.04 | 76.00 | 68.68 | 67.42 | 63.10 | 53.06 | 45.10 | 34.23 | 49.65 | |||||||||||||
MIN | 11.64 | 17.00 | 28.03 | 34.07 | 41.73 | 52.04 | 59.29 | 56.11 | 47.37 | 39.29 | 25.37 | 21.10 | 39.24 | |||||||||||||
YRS | 78 | 80 | 85 | 84 | 77 | 81 | 76 | 77 | 78 | 77 | 78 | 78 | 53 |