YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | 34.87 | b | 40.16 | 41.45 | 57.19 | 58.23 | 69.34 | 65.00 | 60.05 | 48.76 | b | 38.02 | a | 28.13 | a | 49.20 | a | |||||||
1929 | 19.37 | a | 23.76 | a | 39.00 | 41.23 | 52.66 | 57.47 | 65.61 | 69.60 | b | 56.47 | 52.02 | 41.39 | b | 36.40 | a | 46.25 | ||||||||
1930 | 14.62 | b | 36.43 | 39.90 | 49.45 | 50.03 | 55.77 | 68.02 | a | 68.19 | g | 58.88 | b | 44.69 | ----- | z | 27.37 | 44.52 | b | |||||||
1931 | 32.79 | b | 32.91 | a | 38.73 | a | 46.48 | b | 56.67 | b | 58.68 | 68.89 | 67.73 | 56.72 | 48.11 | 32.40 | 26.56 | 47.22 | ||||||||
1932 | 28.00 | c | 30.29 | 37.45 | a | 46.27 | h | 51.58 | 61.52 | 63.19 | 65.50 | 60.65 | 49.68 | 40.97 | a | 25.71 | 46.78 | a | ||||||||
1933 | ----- | z | 26.17 | b | 35.24 | 46.08 | 46.97 | 59.07 | 69.05 | 68.79 | 53.45 | 52.97 | a | 41.21 | b | 35.40 | 48.58 | a | ||||||||
1934 | 37.71 | 39.32 | 46.48 | 53.47 | 56.23 | 61.03 | 67.63 | a | 69.94 | 57.79 | b | 49.48 | b | 39.76 | a | 31.27 | 50.84 | |||||||||
1935 | 31.41 | c | 35.39 | 34.83 | a | 42.38 | b | 53.02 | 58.50 | a | 65.69 | b | 65.11 | 63.74 | a | 50.78 | d | 35.68 | 29.15 | a | 47.14 | |||||
1936 | ----- | z | ----- | z | 35.90 | a | 49.72 | 58.00 | 61.00 | 67.55 | 67.05 | 59.24 | a | 54.81 | 37.84 | a | 34.44 | 52.55 | b | |||||||
1937 | 15.13 | d | 25.96 | 38.02 | 42.27 | 53.38 | b | 59.48 | a | 68.42 | 62.87 | 60.57 | 52.53 | 39.86 | a | 34.65 | a | 46.10 | ||||||||
1938 | 31.11 | c | 29.98 | 37.08 | 46.32 | 52.92 | a | 62.27 | 71.30 | a | 65.08 | a | 66.50 | 49.24 | 34.37 | 32.85 | 48.25 | |||||||||
1939 | 34.47 | a | 31.92 | b | 41.26 | 48.57 | 55.87 | 57.62 | a | 68.31 | 69.53 | 61.62 | 49.73 | 43.93 | 36.85 | a | 49.97 | |||||||||
1940 | 29.79 | 33.34 | 41.82 | 45.75 | ----- | z | 64.15 | 67.44 | 68.05 | 61.78 | 51.62 | a | 32.98 | 33.87 | 48.24 | a | ||||||||||
1941 | 31.40 | 36.84 | 44.35 | 48.82 | 52.18 | 57.98 | 71.47 | a | 66.40 | 54.48 | 47.55 | a | 40.17 | 31.70 | a | 48.61 | ||||||||||
1942 | 21.38 | a | 31.96 | 38.35 | 47.32 | 51.10 | 56.47 | 69.50 | 69.81 | 63.13 | 52.68 | 33.63 | 32.38 | a | 47.31 | |||||||||||
1943 | 20.67 | b | 33.33 | a | 36.44 | 47.48 | 48.56 | ----- | z | ----- | z | ----- | z | 64.55 | b | 49.02 | 36.98 | d | 29.44 | 40.72 | c | |||||
1944 | 29.81 | 32.10 | 37.32 | 44.55 | 52.92 | 58.72 | 68.24 | d | 65.25 | k | 63.62 | a | 55.66 | 35.22 | u | 26.59 | b | 46.95 | b | |||||||
1945 | 31.08 | 34.80 | 35.45 | 43.05 | 52.34 | 57.90 | 69.81 | 70.00 | a | 57.98 | 51.85 | 33.64 | a | 28.17 | a | 47.17 | ||||||||||
1946 | 31.29 | 33.13 | a | 37.79 | 46.32 | 56.84 | c | 56.95 | 67.08 | a | 68.88 | c | 58.40 | a | 43.27 | a | 35.21 | a | 33.93 | c | 47.42 | |||||
1947 | 28.25 | a | 37.07 | a | 43.47 | 48.48 | b | 59.20 | c | 57.48 | e | 66.40 | a | 65.50 | 61.38 | a | 47.44 | 37.71 | a | 33.40 | a | 48.81 | ||||
1948 | 29.44 | 28.36 | 34.83 | b | 42.02 | c | 50.69 | e | 63.07 | a | 63.47 | a | 61.67 | j | 56.98 | c | 48.11 | 35.85 | 23.58 | 43.31 | a | |||||
1949 | 15.37 | 28.62 | 38.40 | b | 49.25 | 58.15 | a | 61.67 | 65.95 | c | 65.81 | b | 61.33 | d | 46.33 | h | 41.66 | k | 30.21 | 47.48 | b | |||||
1950 | 11.87 | 27.25 | 36.03 | 41.07 | 51.52 | a | 57.75 | 66.91 | b | 69.11 | 62.43 | 46.91 | c | 36.97 | 36.54 | h | 46.17 | a | ||||||||
1951 | 25.31 | 34.85 | h | 38.60 | e | 50.70 | b | 50.64 | x | 60.67 | a | 67.43 | d | 64.84 | f | 61.91 | b | 45.12 | a | 35.54 | d | 27.18 | c | 45.83 | c | |
1952 | 24.54 | f | 33.06 | d | ----- | z | 50.40 | i | 53.00 | b | 56.33 | c | 69.07 | c | 65.95 | b | 59.38 | q | ----- | z | ----- | z | ----- | z | 55.48 | g |
1953 | ----- | z | ----- | z | 38.83 | d | 43.50 | a | 49.35 | d | 52.50 | e | 66.48 | c | ----- | z | ----- | z | 47.94 | n | 40.50 | 35.44 | 46.66 | e | ||
1954 | 28.31 | 31.84 | 34.90 | 42.46 | b | 53.31 | 54.67 | ----- | z | ----- | z | ----- | z | ----- | z | 41.08 | r | 31.06 | 39.51 | e | ||||||
1955 | 29.15 | 30.70 | 31.17 | a | 38.48 | 48.02 | 59.55 | 62.53 | a | 64.74 | f | 59.67 | 47.50 | 30.18 | 27.39 | 42.21 | a | |||||||||
1956 | 28.82 | 25.24 | 35.52 | 47.60 | 55.77 | 54.63 | 68.71 | 66.48 | 60.03 | 45.27 | 33.72 | 33.23 | 46.25 | |||||||||||||
1957 | 17.55 | a | 30.50 | 36.45 | 45.65 | 55.68 | 59.43 | 62.74 | 62.03 | 61.82 | 44.81 | 37.93 | 35.53 | 45.84 | ||||||||||||
1958 | 32.48 | 39.68 | 36.42 | 42.97 | 62.93 | h | 63.78 | a | 72.44 | 71.58 | 58.32 | 52.81 | 35.40 | a | 35.38 | a | 49.20 | a | ||||||||
1959 | 29.63 | a | 30.81 | b | 38.65 | 46.05 | a | 48.38 | a | 61.75 | 70.56 | ----- | z | 53.29 | b | 48.16 | l | 34.25 | b | ----- | z | 45.93 | c | |||
1960 | 27.38 | b | 32.88 | 38.76 | 44.19 | a | 48.63 | 60.28 | 73.11 | 62.71 | c | 61.78 | 50.73 | 36.85 | 29.44 | 47.23 | ||||||||||
1961 | 32.61 | 36.48 | 38.10 | 44.14 | a | 50.61 | 65.20 | 70.81 | 73.26 | 56.28 | 46.94 | 34.82 | b | 30.77 | 48.34 | |||||||||||
1962 | 29.53 | a | 34.16 | 35.76 | 47.98 | 47.58 | 58.45 | a | 66.95 | 63.82 | 62.35 | 49.27 | c | 38.83 | 34.70 | a | 47.45 | |||||||||
1963 | 24.20 | a | 40.68 | 38.00 | 41.00 | 50.30 | c | 56.77 | d | 60.98 | 67.15 | 64.12 | 49.95 | 37.43 | 29.55 | 46.68 | ||||||||||
1964 | 31.45 | 35.53 | 35.58 | 41.60 | 50.23 | 56.48 | 65.75 | a | 61.61 | 56.00 | 49.26 | 34.02 | 26.81 | 45.36 | ||||||||||||
1965 | 31.05 | a | 35.86 | 37.79 | 46.20 | 51.43 | a | 59.95 | 67.07 | a | ----- | z | 55.93 | 54.83 | a | 40.12 | 31.03 | 46.48 | a | |||||||
1966 | 30.15 | 32.87 | b | 37.95 | 46.30 | b | 54.87 | 56.35 | c | 64.23 | 66.89 | 60.85 | 48.57 | c | 39.08 | 34.82 | 47.74 | |||||||||
1967 | 34.90 | a | 37.39 | 36.48 | 38.82 | 51.82 | 62.27 | 67.78 | a | 73.15 | 65.74 | a | 47.84 | 38.91 | a | 30.37 | a | 48.79 | ||||||||
1968 | 30.31 | 37.04 | c | 41.35 | 40.72 | c | 50.97 | b | ----- | z | 69.35 | 61.87 | 59.04 | b | 45.97 | a | 37.16 | b | 26.34 | b | 45.47 | a | ||||
1969 | 19.16 | b | 28.46 | b | 37.97 | b | 43.60 | a | 55.18 | 64.07 | b | 65.00 | 63.53 | a | 59.10 | 45.03 | a | 39.33 | a | 29.74 | 45.85 | |||||
1970 | 28.47 | a | 36.34 | 37.93 | a | 39.83 | a | 51.40 | 63.87 | 70.40 | 68.95 | c | 54.57 | 49.66 | 38.47 | a | 29.53 | 47.45 | ||||||||
1971 | 34.82 | 34.11 | f | 33.76 | b | 42.95 | b | 54.76 | n | 56.50 | a | 70.15 | a | 71.95 | b | 53.55 | a | 45.92 | 37.02 | b | 27.45 | c | 47.41 | b | ||
1972 | 27.29 | 32.66 | a | 40.40 | b | 40.09 | c | 53.26 | d | 58.12 | b | 66.22 | b | 69.03 | a | 54.73 | d | 48.35 | d | 37.83 | c | 24.89 | 46.07 | |||
1973 | 26.45 | 34.44 | a | 39.22 | b | 45.55 | a | 53.86 | c | 57.35 | f | 67.74 | d | ----- | z | 59.54 | b | 46.56 | d | 32.90 | 33.95 | b | 44.02 | b | ||
1974 | 23.88 | c | 34.58 | h | 37.70 | f | 43.98 | b | 47.79 | b | 63.12 | a | 64.52 | d | 68.36 | b | 62.54 | b | 50.67 | d | 36.76 | e | 33.00 | a | 49.46 | b |
1975 | 28.98 | b | 29.69 | a | 35.38 | g | 39.64 | b | 50.71 | b | 57.43 | h | 70.71 | 61.83 | d | 61.83 | d | 45.48 | a | 34.36 | b | 33.13 | d | 45.64 | b | |
1976 | 33.84 | c | 31.30 | a | 33.27 | g | 43.48 | b | 50.89 | m | 55.15 | d | 66.06 | g | 63.79 | 62.66 | b | 50.03 | a | 39.67 | 34.42 | a | 46.04 | c | ||
1977 | 25.20 | a | 34.90 | c | 38.77 | 49.50 | a | 47.29 | b | 64.07 | b | 64.98 | b | 71.64 | b | 54.53 | 48.98 | c | 34.10 | d | 29.94 | d | 46.99 | |||
1978 | 30.47 | 35.06 | a | 42.02 | b | 43.21 | f | 48.17 | d | 59.96 | f | 66.43 | a | 64.43 | a | 55.23 | d | 50.39 | 30.83 | 26.63 | d | 44.97 | b | |||
1979 | 17.64 | b | 31.85 | d | 41.70 | d | 44.03 | a | 54.90 | a | 59.93 | a | 67.55 | a | 67.18 | a | 62.41 | b | 50.75 | a | 32.92 | 35.04 | e | 47.16 | ||
1980 | 22.20 | c | 32.16 | a | 37.42 | a | 46.89 | b | 50.88 | b | 53.62 | a | 65.05 | a | 62.29 | 59.39 | b | 50.31 | 38.34 | a | 36.61 | c | 46.26 | |||
1981 | 33.96 | d | 30.71 | i | 41.98 | d | 44.59 | h | 50.31 | e | 54.85 | c | 63.13 | 71.08 | a | 59.71 | d | 46.52 | g | 39.10 | d | 30.75 | c | 49.43 | c | |
1982 | 28.81 | e | 29.04 | e | 37.38 | c | 39.79 | d | 50.29 | c | 61.31 | c | 64.58 | e | 66.00 | c | 56.29 | b | 45.08 | f | 32.91 | c | 29.02 | f | 46.64 | b |
1983 | 35.24 | f | 35.55 | f | 40.74 | f | 43.96 | c | 54.84 | b | 56.07 | 61.54 | c | 68.26 | 54.93 | 48.61 | h | 39.85 | f | 20.13 | d | 51.39 | e | |||
1984 | 32.02 | b | 35.00 | a | 41.28 | a | 41.37 | d | 47.56 | 54.93 | 67.75 | a | 66.70 | a | 55.31 | c | 43.53 | 34.46 | b | 26.77 | a | 45.56 | ||||
1985 | 23.27 | 28.54 | 36.43 | b | 46.30 | 52.81 | 60.05 | 73.55 | 64.37 | 53.32 | 45.27 | 23.68 | 20.92 | 44.04 | ||||||||||||
1986 | 33.40 | 33.46 | 43.73 | a | 43.50 | 52.82 | 65.64 | a | 61.92 | 72.45 | 54.37 | 52.50 | 36.95 | 28.16 | 48.24 | |||||||||||
1987 | 28.48 | 35.61 | 40.48 | a | 49.98 | a | 56.06 | 62.38 | a | 64.72 | a | 66.98 | 64.40 | 54.52 | a | 40.66 | b | 28.23 | 49.38 | |||||||
1988 | 28.02 | 36.29 | a | 39.61 | 47.52 | b | 51.02 | 58.60 | 67.29 | 67.27 | 60.43 | 56.95 | 37.60 | 31.48 | 48.51 | |||||||||||
1989 | 32.42 | 23.12 | 36.37 | 48.21 | a | 51.89 | 62.13 | 65.35 | 63.84 | 61.40 | 48.48 | 40.77 | 33.29 | 47.27 | ||||||||||||
1990 | 33.10 | a | 30.79 | 41.23 | 49.57 | a | 50.81 | ----- | z | 69.18 | 67.57 | a | ----- | z | 45.46 | c | 40.00 | 21.89 | 44.96 | b | ||||||
1991 | 29.03 | 40.27 | 37.02 | a | 44.82 | 50.00 | 54.62 | a | 67.98 | 70.16 | 63.30 | c | 50.50 | a | 37.88 | b | 32.65 | a | 48.19 | |||||||
1992 | 33.70 | a | 39.00 | a | 44.55 | a | 47.53 | a | 56.40 | a | 66.92 | ----- | z | 68.09 | c | 56.38 | a | 49.83 | a | 35.88 | a | 25.91 | b | 47.65 | a | |
1993 | 21.58 | a | 25.50 | c | 38.98 | d | 43.60 | a | 57.35 | 57.96 | b | 59.65 | 64.63 | 60.80 | 51.91 | c | 31.02 | b | 30.03 | 45.25 | ||||||
1994 | 38.38 | b | 29.50 | 42.35 | 48.74 | a | 55.05 | a | 58.84 | a | ----- | z | 66.47 | 63.59 | a | 47.23 | a | ----- | z | 29.75 | c | 47.99 | b | |||
1995 | 30.96 | c | 37.56 | a | ----- | z | ----- | z | 54.47 | ----- | z | 66.31 | ----- | z | 62.97 | ----- | z | 41.68 | b | 30.60 | 46.36 | e | ||||
1996 | 30.23 | 29.25 | c | ----- | z | 45.52 | 48.60 | 57.90 | a | 69.82 | a | 67.44 | 56.80 | 47.44 | 35.55 | a | 27.98 | b | 46.96 | a | ||||||
1997 | 30.76 | 33.76 | a | ----- | z | 43.47 | a | 55.23 | c | 57.53 | ----- | z | ----- | z | ----- | z | 46.09 | c | ----- | z | 31.63 | a | 42.64 | e | ||
1998 | 31.12 | b | 36.87 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.68 | 47.29 | b | ----- | z | ----- | z | 44.24 | h | |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.52 | b | 27.91 | b | 29.22 | j |
2001 | 29.13 | a | 31.71 | b | 40.15 | a | 41.65 | d | 54.84 | 57.00 | e | 66.35 | a | 69.23 | 62.07 | g | 47.48 | c | 38.48 | c | 29.35 | a | 45.94 | a | ||
2002 | 31.60 | e | 33.54 | d | 34.79 | e | 43.81 | a | 48.96 | d | 60.23 | d | 66.88 | j | 61.74 | h | ----- | z | 44.98 | c | 37.43 | a | 31.78 | a | 40.79 | c |
2003 | 34.14 | b | 34.88 | b | 41.02 | e | 42.25 | b | 49.71 | j | 60.66 | k | 73.75 | o | 68.09 | c | 59.23 | d | 49.43 | c | 32.62 | b | 30.92 | a | 43.62 | c |
2004 | 25.54 | c | 31.19 | e | 41.69 | b | 44.98 | a | 51.32 | a | 57.72 | 66.80 | f | 68.80 | a | 58.09 | c | 47.83 | a | 38.78 | a | 34.15 | 45.46 | a | ||
2005 | 30.82 | 33.32 | c | 40.17 | b | 44.67 | a | 52.20 | d | 56.88 | i | 68.03 | k | 66.75 | m | 54.69 | a | 45.98 | d | 32.55 | b | 25.76 | 40.02 | c | ||
2006 | 34.26 | b | 28.96 | d | 36.28 | b | 42.32 | h | 52.20 | i | 57.06 | d | 65.89 | c | 62.11 | d | 55.98 | c | 44.93 | b | 32.90 | e | 27.16 | 44.55 | b | |
2007 | 24.60 | a | 31.71 | b | 38.34 | f | 42.94 | f | 51.58 | m | 58.61 | p | 69.59 | n | 62.68 | q | 54.00 | w | 46.00 | j | 35.95 | i | 27.92 | g | 28.16 | j |
2008 | 23.35 | n | 33.52 | 36.55 | a | 40.54 | d | 52.55 | 55.03 | a | 67.68 | 67.27 | c | 60.41 | a | 47.54 | e | 40.97 | 26.23 | 48.03 | a | |||||
2009 | 28.87 | 32.18 | 32.77 | 43.80 | 50.81 | 59.75 | 68.71 | 69.52 | 61.10 | 43.31 | 36.36 | a | 24.94 | 46.01 | ||||||||||||
2010 | 33.71 | 37.54 | 40.06 | 43.65 | 50.47 | 58.88 | 69.55 | 68.29 | 58.93 | 48.21 | 34.40 | 29.79 | 47.79 | |||||||||||||
2011 | 32.98 | 29.96 | 36.66 | 39.85 | 47.47 | 55.32 | 60.77 | 65.89 | 61.72 | 47.56 | 33.02 | 31.48 | 45.22 | |||||||||||||
2012 | 29.68 | 31.93 | 35.08 | 45.12 | 49.19 | 53.95 | 66.35 | 68.63 | 62.64 | a | 47.18 | 37.58 | 29.92 | 46.44 | ||||||||||||
2013 | 26.48 | 35.16 | 38.92 | 43.67 | 53.45 | 57.05 | 70.52 | 68.10 | 59.57 | 44.81 | 36.23 | 30.23 | 47.01 | |||||||||||||
2014 | 31.47 | 27.55 | 39.00 | 43.97 | 52.70 | c | 58.20 | 71.95 | 68.92 | 60.12 | 52.40 | a | 35.62 | 31.55 | 47.79 | |||||||||||
2015 | 33.87 | 39.05 | 43.77 | 41.24 | k | 53.63 | a | 67.23 | 71.68 | 68.90 | 57.42 | 53.74 | 33.58 | 28.85 | 50.16 | a | ||||||||||
2016 | 30.71 | 38.60 | 40.40 | 50.70 | 54.11 | 60.33 | 66.18 | 69.29 | 58.22 | 46.87 | 43.57 | 25.26 | 48.69 | |||||||||||||
2017 | 21.06 | 29.09 | 38.90 | 42.18 | 52.40 | 60.45 | 71.21 | 73.65 | n | ----- | z | 48.08 | 37.68 | 28.03 | 42.91 | b | ||||||||||
2018 | 34.58 | 32.09 | 37.90 | 45.12 | 58.58 | f | 59.05 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.75 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 28.52 | 32.82 | 38.52 | 44.74 | 52.29 | 59.07 | 67.28 | 67.19 | 59.40 | 48.79 | 36.54 | 30.11 | 47.24 | |||||||||||||
S.D. | 5.46 | 3.87 | 2.85 | 3.20 | 2.94 | 3.19 | 2.99 | 2.87 | 3.27 | 3.04 | 3.42 | 3.66 | 1.37 | |||||||||||||
SKEW | -1.06 | -0.22 | 0.28 | 0.25 | 0.20 | 0.44 | -0.30 | -0.12 | -0.14 | 0.44 | -0.57 | -0.31 | 0.22 | |||||||||||||
MAX | 38.38 | 40.68 | 46.48 | 53.47 | 59.20 | 67.23 | 73.55 | 73.26 | 66.50 | 56.95 | 43.93 | 36.85 | 50.84 | |||||||||||||
MIN | 11.87 | 23.13 | 31.17 | 38.48 | 46.97 | 52.50 | 59.65 | 61.61 | 53.29 | 43.27 | 23.68 | 20.13 | 44.04 | |||||||||||||
YRS | 82 | 82 | 79 | 80 | 79 | 78 | 76 | 70 | 79 | 78 | 79 | 83 | 42 |