YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | 43.88 | a | 53.72 | 56.68 | 71.18 | 73.92 | 72.50 | 67.28 | 59.87 | 47.87 | o | 41.39 | 60.05 | c | ||||||||
1936 | 39.92 | 40.31 | 47.50 | 56.98 | 62.76 | 71.50 | a | 73.77 | 72.39 | 64.08 | 55.43 | a | 45.41 | a | 41.61 | d | 55.97 | |||||||||
1937 | 26.44 | 36.86 | c | 45.31 | b | 53.92 | 62.23 | 65.80 | 72.31 | 73.00 | 67.78 | 57.82 | 47.62 | 40.16 | b | 54.10 | ||||||||||
1938 | 40.61 | 39.04 | 42.79 | 51.25 | 58.26 | 68.38 | 71.97 | 71.77 | 67.96 | e | 56.39 | 43.48 | 40.84 | 54.40 | ||||||||||||
1939 | 36.37 | 31.07 | 46.44 | 55.57 | 62.69 | 71.07 | 76.95 | 73.85 | 66.35 | 55.73 | 48.97 | a | 46.44 | 55.96 | ||||||||||||
1940 | 41.80 | h | 41.05 | 49.19 | 53.59 | a | 63.05 | 72.27 | 75.53 | b | 71.16 | 64.55 | 55.38 | n | 42.17 | u | ----- | z | 61.30 | d | ||||||
1941 | ----- | z | ----- | z | ----- | z | 44.02 | i | ----- | z | 65.24 | a | 72.55 | a | 70.27 | 63.68 | 51.10 | 51.73 | o | 37.69 | g | 64.57 | g | |||
1942 | 39.42 | 36.96 | 42.28 | a | 50.65 | 57.91 | b | 67.40 | 75.18 | 70.74 | 66.27 | ----- | z | ----- | z | ----- | z | 56.31 | c | |||||||
1943 | ----- | z | ----- | z | 48.52 | c | 56.48 | 62.00 | b | 67.25 | 74.65 | 71.05 | 68.18 | b | ----- | z | 49.31 | c | 38.12 | b | 59.51 | c | ||||
1944 | 38.03 | a | 38.12 | 42.05 | b | 48.13 | c | 58.88 | a | 64.34 | a | 72.06 | 73.02 | a | 67.08 | 58.85 | e | 43.22 | a | 41.06 | 53.74 | |||||
1945 | 39.26 | 41.63 | a | 39.24 | 49.42 | d | 58.74 | h | 66.42 | e | 74.35 | 72.73 | 67.18 | 60.79 | q | 47.88 | a | 39.77 | a | 53.79 | b | |||||
1946 | 39.37 | e | ----- | z | ----- | z | 57.50 | a | 60.65 | a | 71.25 | 74.43 | b | 72.42 | 69.57 | a | ----- | z | 51.60 | y | 44.30 | a | 61.19 | d | ||
1947 | 36.47 | 46.93 | a | 48.64 | b | 53.48 | a | 63.78 | b | 68.55 | 74.97 | 71.43 | a | 70.25 | 57.25 | c | 41.32 | h | 37.17 | e | 57.17 | a | ||||
1948 | 45.64 | q | 36.64 | d | 38.50 | h | 54.46 | p | 61.67 | p | 69.93 | g | 74.80 | i | 72.41 | h | 68.89 | g | 56.50 | k | 43.17 | f | 39.37 | l | 36.64 | k |
1949 | 27.60 | g | 32.90 | d | 44.92 | s | 56.26 | i | 59.37 | h | 67.20 | e | 73.40 | f | 71.58 | g | 68.53 | n | 57.33 | s | 54.10 | i | 35.83 | k | 50.05 | j |
1950 | 36.26 | l | 43.44 | k | 46.17 | h | 56.52 | h | 63.09 | t | 68.80 | c | 72.11 | 72.43 | h | 65.89 | g | 62.81 | j | 52.73 | b | 48.05 | i | 64.55 | i | |
1951 | 39.21 | e | 42.37 | a | 43.82 | f | 52.08 | e | 60.11 | d | 67.50 | i | 77.52 | g | 72.41 | i | 69.24 | m | 56.08 | k | 46.05 | i | 37.48 | d | 46.25 | g |
1952 | 37.37 | d | 39.87 | f | 39.02 | c | 52.37 | d | 62.32 | i | 67.24 | c | 72.70 | d | 74.98 | h | 68.83 | j | 62.86 | j | 43.33 | l | 36.14 | m | 53.74 | g |
1953 | 43.69 | o | ----- | z | 49.07 | q | 53.00 | c | 55.85 | a | 70.24 | a | 75.00 | a | 73.02 | d | 70.61 | h | 56.86 | j | 50.67 | j | 39.41 | i | 65.42 | g |
1954 | 41.35 | g | 47.23 | d | 44.07 | d | 58.15 | 63.43 | d | 69.76 | a | 75.39 | 72.08 | g | 68.63 | d | 60.04 | e | 52.90 | e | 43.74 | j | 59.96 | c | ||
1955 | 33.41 | d | 35.70 | c | 46.23 | e | 51.43 | c | 59.18 | c | 67.23 | 72.00 | b | 72.54 | c | 69.31 | c | 61.77 | a | 47.37 | c | 43.31 | b | 54.96 | ||
1956 | 43.09 | b | 37.24 | b | 48.67 | b | 51.14 | b | 63.88 | a | 72.82 | b | 73.17 | a | 71.17 | d | 72.22 | a | 56.94 | d | 45.87 | c | 41.52 | c | 56.48 | |
1957 | 38.42 | a | 47.27 | 46.98 | 50.62 | a | 55.58 | 69.81 | a | 73.73 | 71.98 | i | 68.30 | 54.87 | d | 42.33 | f | 44.31 | 54.99 | b | ||||||
1958 | 40.23 | a | 44.32 | c | 41.05 | a | 51.30 | 65.11 | d | 71.16 | a | 75.76 | b | 74.83 | a | 67.17 | a | 58.84 | b | 46.83 | a | 46.52 | b | 56.93 | ||
1959 | 42.37 | a | 38.84 | c | 48.27 | 56.75 | b | 59.39 | 71.83 | a | 75.85 | a | 71.27 | 67.21 | a | 58.63 | 48.40 | a | 44.07 | h | 58.07 | a | ||||
1960 | 34.33 | a | 36.88 | a | 49.79 | 54.67 | 61.32 | a | 72.14 | a | 76.33 | b | 74.44 | 70.03 | 55.17 | a | 48.70 | e | 39.42 | 56.10 | ||||||
1961 | 42.92 | 43.59 | 45.68 | a | 54.28 | 59.92 | 72.52 | 75.66 | b | 72.22 | a | 64.70 | 56.03 | 43.24 | a | 36.88 | a | 55.64 | ||||||||
1962 | 38.07 | a | 41.55 | 41.13 | e | 58.54 | b | 58.22 | a | 67.74 | a | 73.82 | 75.05 | 68.41 | b | 58.10 | a | 50.10 | f | 44.66 | f | 58.06 | b | |||
1963 | 35.92 | f | 46.81 | b | 45.55 | b | 51.03 | 63.15 | a | 66.65 | c | 76.78 | a | 71.06 | 68.80 | 60.45 | 48.54 | b | 41.33 | h | 59.88 | b | ||||
1964 | 36.97 | b | 38.35 | c | 41.10 | 50.08 | 59.20 | a | 67.59 | c | 75.35 | 71.52 | 66.28 | 62.27 | a | 43.84 | a | 39.98 | h | 55.69 | a | |||||
1965 | 42.56 | e | 40.61 | a | 42.61 | 49.34 | a | 56.45 | a | 62.93 | 72.97 | a | 72.23 | 63.05 | 60.68 | 49.36 | a | 39.60 | f | 55.71 | a | |||||
1966 | 34.64 | f | 35.41 | e | 47.85 | a | 55.90 | 63.81 | 69.10 | 74.68 | 72.98 | 67.78 | 57.48 | 49.90 | a | 41.52 | c | 57.86 | a | |||||||
1967 | 40.04 | e | 44.32 | 49.14 | b | 48.33 | 59.77 | 65.27 | 73.42 | 71.27 | c | 66.93 | 59.53 | a | 50.26 | c | 33.73 | k | 57.12 | a | ||||||
1968 | 37.82 | i | 44.06 | m | 47.72 | b | 50.16 | a | 60.32 | 69.22 | 72.74 | 69.15 | a | 67.20 | 58.76 | 47.00 | 36.27 | c | 57.85 | b | ||||||
1969 | 42.62 | e | 39.50 | j | 40.02 | f | 53.59 | a | 62.52 | a | 67.50 | 74.73 | 75.96 | f | 68.27 | 54.19 | d | 46.65 | 43.48 | a | 57.06 | c | ||||
1970 | 40.55 | c | 44.50 | i | 43.76 | 47.38 | a | 61.98 | 69.95 | 75.66 | 74.31 | 64.53 | 53.15 | 48.32 | e | 38.72 | f | 57.96 | b | |||||||
1971 | 40.04 | f | 41.88 | g | 48.35 | 51.95 | 56.35 | 68.85 | 76.03 | b | 71.76 | 67.33 | 52.31 | 46.55 | a | 34.05 | k | 59.94 | c | |||||||
1972 | 39.90 | j | 44.30 | g | 55.29 | 55.36 | a | 61.90 | 69.33 | 76.31 | 72.76 | 67.07 | 54.12 | c | 42.16 | a | 36.65 | g | 61.59 | c | ||||||
1973 | 36.43 | c | 40.74 | g | 38.34 | 48.90 | 61.90 | 70.03 | 74.52 | 73.37 | 67.62 | 59.19 | 46.30 | 43.21 | j | 57.66 | b | |||||||||
1974 | 37.52 | a | 41.77 | d | 48.38 | a | 52.47 | 63.12 | a | 74.93 | 72.94 | 71.66 | 67.17 | 57.72 | a | 46.70 | c | 38.12 | j | 57.67 | a | |||||
1975 | 36.65 | a | 39.62 | c | 41.93 | d | 46.07 | 58.44 | 68.10 | 72.84 | 72.50 | 66.68 | 57.09 | b | 47.07 | 42.08 | f | 55.18 | a | |||||||
1976 | 40.98 | d | 43.24 | d | 44.07 | a | 50.39 | b | 60.87 | 68.13 | 72.47 | 70.77 | 64.25 | 54.74 | 49.02 | d | 41.76 | j | 56.27 | a | ||||||
1977 | 36.76 | h | 44.46 | b | 44.04 | f | 53.62 | 55.98 | 69.42 | 73.50 | 72.92 | 67.57 | 59.31 | b | 49.68 | 44.22 | h | 60.72 | c | |||||||
1978 | 40.15 | a | 39.35 | h | 47.75 | e | 51.33 | 59.73 | 70.65 | 74.42 | 71.21 | 63.26 | a | 53.95 | c | 43.00 | a | 38.54 | s | 57.54 | b | |||||
1979 | 31.50 | c | 38.33 | b | 43.58 | g | 51.64 | e | 58.84 | f | 67.72 | g | 75.26 | b | 71.31 | b | 70.59 | c | 62.48 | a | 43.07 | g | 41.58 | e | 55.34 | d |
1980 | 40.78 | h | 43.37 | f | 42.86 | i | 50.95 | j | 56.15 | d | 68.53 | j | 76.56 | o | 70.46 | f | 68.43 | c | 58.69 | d | 50.48 | b | 47.47 | b | 56.24 | g |
1981 | 44.44 | 44.27 | d | 44.83 | a | 55.60 | e | 59.95 | c | 73.26 | a | 75.22 | a | 73.11 | 67.10 | 55.02 | d | 50.20 | 44.19 | 57.27 | ||||||
1982 | 37.45 | 42.52 | 44.57 | b | 47.96 | r | 60.10 | k | 66.32 | 72.25 | a | 72.82 | a | 66.88 | d | 54.47 | 45.67 | c | 38.58 | 54.15 | b | |||||
1983 | 42.00 | 42.07 | 43.26 | 46.07 | 58.68 | 66.48 | 72.81 | 72.18 | 69.57 | 57.65 | 46.28 | 41.95 | b | 54.92 | ||||||||||||
1984 | 42.63 | 42.55 | 48.11 | 51.83 | a | 65.97 | 68.12 | 74.02 | 71.73 | 68.36 | a | 51.90 | a | 46.30 | c | 38.88 | a | 55.87 | ||||||||
1985 | 38.35 | 39.16 | 44.95 | 55.57 | 60.69 | 71.28 | 74.95 | 72.98 | 62.71 | a | 56.78 | b | 43.38 | a | 43.55 | 55.36 | ||||||||||
1986 | 46.90 | b | 44.73 | b | 49.29 | 53.05 | b | 60.87 | 69.23 | h | 70.75 | e | 72.31 | e | 61.36 | b | 53.17 | d | 46.65 | d | 41.44 | e | 54.59 | a | ||
1987 | 36.93 | b | 40.16 | 43.37 | e | 56.61 | b | ----- | z | 70.83 | a | 71.47 | 70.93 | a | 66.00 | 60.30 | a | 44.93 | a | 36.79 | c | 54.39 | a | |||
1988 | 38.52 | a | 45.48 | a | 46.55 | b | 52.39 | b | 60.86 | c | 69.40 | a | 74.05 | 71.33 | a | 65.68 | b | 62.48 | 46.47 | a | 38.55 | a | 55.98 | |||
1989 | 37.31 | 42.40 | c | 52.15 | a | 60.38 | 63.90 | 70.72 | 75.53 | 71.50 | a | 68.40 | 57.40 | 49.82 | 43.12 | b | 57.72 | |||||||||
1990 | 38.26 | 39.73 | b | 47.60 | a | 55.78 | 59.69 | 72.47 | 72.79 | 70.24 | 67.60 | 57.71 | 48.05 | b | 36.17 | b | 55.51 | |||||||||
1991 | 39.70 | a | 48.52 | 41.47 | a | 52.26 | a | 58.48 | 65.37 | c | 74.63 | 73.84 | b | 67.95 | a | 60.39 | 47.12 | a | 41.06 | 55.90 | ||||||
1992 | 39.62 | a | 45.04 | a | 46.79 | 57.95 | 61.65 | d | 66.37 | 71.48 | a | 71.31 | 67.13 | 59.34 | 44.75 | 37.89 | 55.78 | |||||||||
1993 | 40.82 | 40.96 | a | 49.20 | a | 54.75 | b | 62.40 | 68.96 | b | 72.37 | 71.59 | b | 66.80 | c | 56.08 | 44.25 | 40.58 | 55.73 | |||||||
1994 | 42.07 | c | 39.89 | a | 49.36 | b | 51.98 | f | 59.00 | a | 72.66 | a | 74.42 | 74.73 | a | 67.59 | a | 54.34 | 41.45 | a | 41.26 | 56.07 | a | |||
1995 | 37.70 | a | 48.33 | b | 46.80 | a | 49.45 | 55.28 | b | 66.71 | d | 73.35 | 74.97 | 68.25 | d | 59.23 | a | 52.85 | d | 43.13 | d | 56.34 | ||||
1996 | 41.45 | 47.05 | a | 48.11 | 55.95 | b | 63.98 | a | 72.45 | 75.37 | 73.40 | a | 63.57 | a | 56.36 | b | 47.56 | d | 41.92 | a | 57.26 | |||||
1997 | 37.68 | 41.85 | a | 50.88 | a | 51.10 | a | 64.76 | 67.18 | 73.42 | 72.63 | 68.88 | 55.37 | a | 47.16 | a | 37.83 | a | 55.73 | |||||||
1998 | 41.31 | 36.59 | 44.06 | 48.18 | b | 56.86 | c | 64.39 | b | 73.93 | a | 73.94 | 65.90 | 55.35 | d | 46.31 | c | 40.58 | 53.95 | |||||||
1999 | 42.68 | a | 45.00 | 48.36 | b | 47.00 | c | 60.22 | d | 69.02 | d | 72.36 | f | 71.20 | d | 65.85 | c | 59.63 | 52.96 | b | 40.68 | 54.78 | a | |||
2000 | 41.81 | b | 45.08 | e | 45.67 | a | 56.78 | a | 65.78 | b | 71.84 | b | 75.98 | c | 73.98 | d | 71.38 | e | 54.88 | g | 40.72 | e | 44.59 | d | 57.60 | a |
2001 | 38.23 | c | 41.62 | b | 49.80 | c | 52.21 | a | 66.02 | d | 71.00 | c | 74.57 | a | 72.40 | g | 69.53 | m | 58.45 | c | 46.21 | m | ----- | z | 56.49 | d |
2002 | ----- | z | 49.54 | o | 48.46 | c | 58.74 | e | 62.57 | c | 74.03 | 77.35 | 73.72 | d | 68.12 | b | 56.68 | c | 49.44 | c | 39.58 | a | 60.87 | b | ||
2003 | 49.11 | 43.65 | a | 47.55 | a | 51.78 | g | 64.86 | c | 70.66 | a | 78.43 | c | 74.98 | c | 71.21 | d | 64.76 | f | 46.72 | 41.20 | f | 60.80 | c | ||
2004 | 41.47 | a | 38.79 | a | 55.05 | b | 52.66 | b | 63.13 | e | 70.79 | a | 74.03 | b | 72.40 | b | 67.98 | d | 56.17 | h | 45.57 | h | 43.41 | b | 57.97 | b |
2005 | 42.27 | a | 43.96 | 46.45 | b | 54.00 | b | 63.44 | 68.16 | b | 76.65 | a | 72.48 | 68.85 | c | 60.11 | c | 51.21 | a | 44.90 | b | 57.71 | ||||
2006 | 43.85 | n | 47.13 | b | 43.53 | a | 55.73 | b | 65.53 | a | 73.50 | 75.71 | 72.60 | 66.09 | b | ----- | z | 51.13 | d | 40.46 | e | 59.14 | b | |||
2007 | 38.17 | b | 44.00 | i | 52.62 | b | 55.00 | c | 63.18 | i | 72.50 | c | 76.83 | b | 75.33 | d | 69.05 | a | 60.03 | b | 54.90 | 38.15 | g | 61.60 | c | |
2008 | 36.69 | e | 42.52 | a | 50.00 | a | 54.91 | b | 58.50 | a | 70.96 | b | 75.25 | c | 73.82 | a | 68.91 | a | 60.66 | c | 53.34 | a | 40.54 | c | 57.18 | |
2009 | 44.55 | b | 45.67 | e | 48.84 | f | 53.36 | b | 66.43 | a | 67.66 | b | 77.27 | a | 74.60 | 69.28 | e | 56.28 | a | ----- | z | 37.00 | h | 61.68 | c | |
2010 | 41.06 | e | 41.04 | c | 46.16 | ----- | z | 58.66 | b | 70.18 | b | 75.89 | 73.69 | b | 71.20 | c | 58.65 | 46.37 | 43.87 | d | 56.98 | a | ||||
2011 | 40.70 | d | 40.85 | d | 50.66 | c | 55.12 | 59.27 | c | 69.95 | 75.63 | 76.85 | 69.98 | 59.27 | 46.47 | 38.19 | 56.91 | |||||||||
2012 | 44.47 | 42.91 | 48.03 | 57.18 | 64.04 | d | 75.26 | i | 74.63 | 75.27 | 69.15 | 60.16 | b | 52.75 | 40.05 | 57.15 | a | |||||||||
2013 | 38.76 | 39.77 | 51.90 | 56.27 | 62.83 | a | 73.88 | 75.27 | 73.89 | 67.80 | 56.19 | 50.00 | 40.65 | 57.27 | ||||||||||||
2014 | 46.89 | 47.24 | a | 51.10 | a | 56.92 | e | 60.50 | l | 73.42 | 76.47 | 71.18 | 69.75 | 62.92 | 51.32 | 42.98 | 59.11 | a | ||||||||
2015 | 44.52 | 50.23 | 54.24 | 55.17 | 58.34 | 73.03 | 73.21 | 75.45 | 70.92 | 61.39 | 46.08 | 44.89 | q | 60.23 | a | |||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 39.77 | 41.82 | 46.66 | 53.20 | 60.93 | 69.47 | 74.40 | 72.66 | 67.49 | 57.62 | 47.65 | 41.11 | 55.95 | |||||||||||||
S.D. | 3.61 | 3.95 | 3.70 | 3.22 | 2.89 | 2.64 | 1.61 | 1.50 | 2.17 | 2.75 | 3.09 | 2.72 | 1.10 | |||||||||||||
SKEW | -0.51 | -0.24 | -0.02 | -0.19 | -0.08 | -0.16 | -0.01 | 0.37 | -0.45 | -0.21 | 0.10 | 0.17 | -0.27 | |||||||||||||
MAX | 49.11 | 50.23 | 55.29 | 60.38 | 66.43 | 74.93 | 78.43 | 76.85 | 72.22 | 62.92 | 54.90 | 47.47 | 57.72 | |||||||||||||
MIN | 26.44 | 31.07 | 38.34 | 46.07 | 55.28 | 62.93 | 70.75 | 69.15 | 61.36 | 51.10 | 40.72 | 36.17 | 53.74 | |||||||||||||
YRS | 63 | 64 | 69 | 72 | 70 | 75 | 76 | 71 | 74 | 66 | 64 | 52 | 28 |