YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | 11.62 | c | 26.89 | 34.15 | 38.31 | a | 52.65 | 57.60 | 68.33 | a | 66.10 | 61.37 | 49.90 | a | 39.40 | 34.85 | 45.10 | |||||||||
1938 | 30.52 | a | 28.66 | 32.84 | 43.80 | 50.24 | 60.47 | 69.52 | 65.11 | 61.60 | 46.97 | 32.15 | 31.57 | k | 47.44 | a | ||||||||||
1939 | 29.13 | d | 26.88 | 38.87 | a | 48.18 | 54.17 | a | 52.34 | h | 69.44 | 68.74 | 59.30 | b | 48.38 | a | 39.74 | a | 34.44 | 47.02 | a | |||||
1940 | 28.37 | 32.34 | 40.32 | 44.42 | 55.66 | c | 64.07 | b | 67.82 | a | 69.29 | 57.33 | a | 49.13 | 31.97 | 32.08 | a | 47.73 | ||||||||
1941 | 28.85 | a | 31.71 | 40.19 | 44.50 | b | 51.83 | a | 55.34 | a | 67.48 | 62.81 | 52.52 | 46.00 | 38.28 | 29.45 | 45.75 | |||||||||
1942 | 20.52 | 25.57 | 33.11 | 44.13 | 46.42 | a | 54.22 | 68.15 | 67.52 | 59.12 | 48.90 | 33.83 | 28.73 | 44.18 | ||||||||||||
1943 | 22.60 | 29.72 | a | 34.15 | 46.50 | 47.11 | 51.48 | 64.15 | d | 61.53 | 61.63 | 45.73 | a | 34.67 | 28.08 | a | 43.95 | |||||||||
1944 | 19.05 | 26.45 | 32.81 | 39.75 | 48.11 | 51.70 | 61.37 | 61.70 | a | 56.65 | 50.08 | 28.52 | 23.82 | a | 41.67 | |||||||||||
1945 | 26.58 | 30.64 | 31.81 | 39.18 | 48.19 | 53.12 | a | 66.81 | 65.03 | 56.22 | 50.05 | 32.43 | 26.02 | 43.84 | ||||||||||||
1946 | 24.34 | 26.64 | 35.87 | a | 44.60 | 49.85 | 55.18 | 66.83 | a | 68.81 | 55.11 | g | 38.90 | b | 34.48 | 33.10 | a | 43.51 | a | |||||||
1947 | 23.67 | e | 35.00 | 40.10 | 43.21 | k | 57.90 | 54.27 | 67.08 | f | 64.75 | q | 56.30 | c | 47.71 | j | 33.19 | c | 28.84 | 41.16 | d | |||||
1948 | 31.33 | e | 28.36 | a | 32.77 | 39.57 | 48.39 | 60.07 | 64.40 | a | 61.93 | a | 54.43 | 47.03 | a | 32.22 | 20.84 | 43.44 | ||||||||
1949 | 13.21 | 26.04 | 34.39 | 46.62 | 52.52 | b | 59.72 | n | 65.19 | b | 63.32 | a | 57.93 | b | 40.00 | c | 41.08 | 24.06 | e | 42.21 | a | |||||
1950 | 18.19 | 26.57 | a | 32.12 | a | 41.52 | c | 46.93 | a | 54.62 | 66.92 | a | 66.47 | l | 52.80 | o | 50.60 | e | 37.71 | a | 33.63 | a | 40.88 | b | ||
1951 | 23.63 | 31.24 | a | 32.08 | 46.28 | a | 51.03 | a | 57.90 | d | 67.93 | d | 65.29 | 60.33 | a | 44.05 | a | 31.27 | 22.32 | a | 44.45 | |||||
1952 | 21.85 | a | 25.78 | 25.50 | j | 47.96 | g | 51.35 | 55.78 | a | 66.76 | 67.18 | 61.45 | 54.63 | 34.41 | a | 28.90 | a | 46.81 | b | ||||||
1953 | 37.67 | b | 35.91 | 36.97 | 41.20 | 45.13 | 51.60 | a | 67.47 | 64.27 | a | 64.32 | e | 50.20 | h | 41.38 | 31.81 | 47.07 | a | |||||||
1954 | 29.83 | a | 36.13 | b | 33.85 | 44.80 | 53.78 | a | 53.53 | 67.66 | 62.02 | a | 56.36 | b | 47.94 | e | 42.27 | 26.67 | a | 46.24 | ||||||
1955 | 23.50 | 28.20 | c | 34.88 | a | 36.12 | 48.41 | c | 60.79 | a | 62.63 | a | 69.29 | b | 58.23 | b | 49.09 | b | 34.14 | a | 31.18 | a | 44.71 | |||
1956 | 29.02 | 26.10 | 36.50 | b | 46.98 | 52.52 | c | 54.78 | 68.33 | a | 65.07 | d | 59.22 | 47.64 | c | 37.90 | d | 30.58 | a | 46.22 | ||||||
1957 | 19.32 | a | 32.54 | d | 37.47 | a | 43.83 | a | 51.53 | 59.48 | 63.67 | a | 62.66 | 60.63 | c | 43.11 | c | 32.82 | b | 31.52 | 44.88 | |||||
1958 | 27.18 | 35.43 | a | 31.80 | a | 40.18 | 56.48 | 58.55 | a | 67.05 | b | 69.02 | 55.13 | 50.65 | a | 36.06 | d | 34.23 | a | 46.81 | ||||||
1959 | 31.03 | a | 31.00 | b | 36.82 | 45.84 | b | 46.27 | 60.07 | 69.35 | 63.82 | 53.22 | a | 48.45 | 39.30 | b | 26.69 | e | 45.99 | |||||||
1960 | 25.54 | g | 27.09 | a | 38.55 | a | 42.33 | 46.68 | a | 59.77 | 71.21 | 62.98 | 60.86 | a | 48.26 | b | 34.00 | a | 28.71 | b | 47.31 | a | ||||
1961 | 30.77 | a | 36.08 | b | 36.62 | a | 43.48 | e | 46.39 | 65.28 | 70.15 | 70.63 | 52.92 | 48.07 | b | 33.68 | 27.50 | a | 46.80 | |||||||
1962 | 21.95 | b | 30.24 | a | 32.06 | e | 47.83 | c | 46.81 | 58.53 | a | 65.61 | 64.40 | g | 60.17 | g | 47.15 | a | 37.88 | a | 32.44 | d | 42.05 | b | ||
1963 | 25.41 | i | 40.07 | a | 36.48 | 38.20 | 51.58 | 56.00 | a | 61.94 | 65.39 | 62.77 | 49.97 | a | 36.58 | j | 31.02 | a | 49.34 | b | ||||||
1964 | 26.32 | a | 29.79 | a | 31.88 | a | 40.62 | 47.64 | b | 55.17 | d | 66.00 | d | 63.53 | b | 56.07 | a | 51.85 | a | 34.94 | e | 29.16 | b | 44.41 | ||
1965 | 28.02 | b | 34.82 | 35.37 | a | 43.98 | 47.83 | d | 57.54 | b | 65.50 | a | 62.30 | c | 53.43 | a | 52.30 | f | 38.25 | 27.12 | e | 44.92 | a | |||
1966 | 26.81 | b | 28.50 | a | 38.48 | g | 44.98 | c | 54.98 | c | 55.47 | o | 63.34 | 65.45 | 59.30 | b | 47.63 | a | 37.57 | a | 28.12 | c | 45.67 | b | ||
1967 | 30.02 | a | 33.82 | f | 32.90 | 35.02 | a | 50.26 | 58.76 | a | 69.76 | 70.93 | a | 61.46 | c | 46.06 | e | 41.31 | i | 26.07 | d | 48.12 | b | |||
1968 | 26.15 | a | 36.91 | 39.15 | 39.35 | 48.82 | 58.62 | a | 69.50 | 59.89 | 56.83 | 45.29 | 35.02 | 28.35 | a | 45.32 | ||||||||||
1969 | ----- | z | 28.05 | 34.48 | k | 42.88 | 53.71 | 58.73 | 65.27 | 65.08 | 59.48 | c | 41.60 | 37.38 | 31.22 | a | 48.34 | b | ||||||||
1970 | 29.60 | 35.30 | a | 34.00 | 36.00 | 50.15 | 60.45 | 67.69 | 69.16 | 51.92 | 43.58 | 36.10 | 23.95 | k | 46.72 | a | ||||||||||
1971 | 30.79 | g | 32.29 | 31.32 | a | 40.64 | b | 49.32 | 53.85 | 67.13 | 71.15 | 52.65 | 42.71 | 34.22 | 24.45 | c | 45.43 | a | ||||||||
1972 | 25.33 | a | 31.02 | 39.81 | 39.32 | 51.87 | 60.91 | c | 65.35 | a | 65.71 | 51.04 | b | 46.63 | a | 34.52 | 21.15 | 44.39 | ||||||||
1973 | 25.02 | 32.65 | a | 34.88 | a | 42.77 | 54.58 | a | 60.67 | a | 68.97 | 67.12 | a | 57.27 | 46.35 | 33.47 | 31.68 | 46.29 | ||||||||
1974 | 24.48 | 31.09 | 34.68 | 40.20 | 47.56 | 64.13 | 66.26 | 66.56 | 63.03 | 49.15 | 36.63 | 30.00 | b | 46.15 | ||||||||||||
1975 | 28.39 | d | 30.24 | i | 34.27 | r | 36.08 | d | 50.24 | d | 58.25 | 70.16 | f | 63.12 | a | 64.15 | 45.87 | 37.38 | d | 34.55 | i | 47.93 | d | |||
1976 | 32.67 | g | 31.09 | f | 34.71 | 40.59 | a | 53.36 | c | 55.20 | 67.58 | 60.23 | 59.75 | 49.09 | c | 42.78 | a | 33.79 | 49.71 | b | ||||||
1977 | 23.44 | 35.46 | 33.50 | 47.38 | 43.83 | a | 62.82 | 65.13 | 69.63 | 55.02 | 48.94 | 34.50 | b | 31.34 | 45.92 | |||||||||||
1978 | 28.98 | 31.64 | 41.69 | ----- | z | 46.10 | 58.12 | 67.52 | 64.94 | 54.41 | a | 52.21 | 32.47 | 24.05 | 45.65 | a | ||||||||||
1979 | 19.20 | a | 30.94 | b | 40.61 | h | 41.75 | 52.52 | 60.37 | 68.05 | 65.35 | 62.43 | 52.27 | 32.13 | 30.47 | 46.86 | a | |||||||||
1980 | 26.24 | 35.64 | a | 35.13 | 45.00 | 49.58 | 54.09 | a | 66.97 | 63.47 | 58.27 | 47.57 | a | 37.10 | d | 35.17 | g | 47.19 | a | |||||||
1981 | 29.95 | l | 30.86 | 37.87 | 43.02 | b | 46.57 | d | 56.10 | 63.93 | a | 70.68 | 59.37 | 44.02 | c | 38.91 | g | 29.32 | n | 50.27 | c | |||||
1982 | ----- | z | ----- | z | 34.00 | x | 38.86 | p | 47.28 | m | 59.46 | b | 64.87 | e | 66.04 | f | 56.20 | g | 44.88 | j | 33.00 | l | 24.27 | t | 62.16 | j |
1983 | 31.35 | r | 33.15 | r | 37.17 | p | 39.72 | u | 53.84 | i | 56.74 | g | 60.20 | c | 67.98 | e | 56.69 | i | 49.45 | l | 35.30 | o | 26.09 | o | 64.09 | j |
1984 | 24.74 | n | 28.21 | q | 37.42 | s | 38.40 | o | 47.43 | q | 55.68 | m | 69.95 | k | 69.16 | o | 57.28 | u | 49.83 | y | 34.46 | q | 21.90 | 21.90 | k | |
1985 | 21.83 | b | 25.91 | 31.93 | a | 46.77 | b | 51.81 | g | 60.93 | p | 72.08 | g | 64.63 | e | 51.07 | p | 38.67 | s | 21.08 | q | 19.50 | k | 38.21 | g | |
1986 | 29.46 | h | 35.41 | f | 41.92 | a | 40.57 | b | 48.02 | f | 65.23 | f | 62.07 | c | 70.88 | c | 47.85 | g | 49.83 | b | 38.26 | c | 28.02 | 47.36 | e | |
1987 | 24.73 | a | 32.61 | 37.27 | a | 49.12 | b | 54.14 | b | 62.68 | e | 61.56 | f | 66.48 | g | 63.38 | b | 54.91 | b | 33.70 | j | 28.25 | g | 47.35 | d | |
1988 | 24.37 | d | 35.31 | b | 37.19 | e | 44.55 | a | 49.29 | b | 58.75 | b | 68.74 | b | 66.81 | 58.00 | c | 58.48 | e | 34.58 | 26.57 | a | 46.89 | |||
1989 | 24.75 | c | 22.52 | c | 36.77 | 46.93 | 49.38 | a | 61.12 | d | 67.10 | 61.56 | f | 58.07 | b | 48.03 | a | 38.93 | a | 32.43 | d | 44.18 | a | |||
1990 | 32.40 | a | 29.38 | 39.24 | b | 50.50 | c | 47.27 | a | 59.54 | c | 69.97 | a | 67.02 | b | 64.81 | c | 46.83 | b | 36.88 | b | ----- | z | 49.44 | a | |
1991 | 29.79 | 39.04 | 35.48 | 41.02 | b | 46.84 | b | 53.79 | a | 69.37 | 69.08 | 63.07 | 50.77 | 35.42 | 30.33 | a | 47.00 | |||||||||
1992 | 29.39 | 38.67 | b | 43.48 | 47.50 | 59.21 | 63.78 | a | 64.74 | b | 68.26 | 57.94 | e | 51.92 | g | 31.59 | b | 24.27 | a | 48.07 | a | |||||
1993 | 19.44 | 21.06 | a | 35.23 | c | 40.61 | h | 54.70 | f | 54.33 | c | 56.98 | b | 60.23 | c | 61.17 | 50.77 | 30.86 | a | ----- | z | 43.34 | c | |||
1994 | ----- | z | 29.89 | 41.45 | 45.97 | a | 53.42 | 60.09 | b | 71.23 | a | 68.03 | 62.72 | 46.45 | 28.20 | b | 27.23 | c | 48.61 | a | ||||||
1995 | 29.84 | l | 40.58 | d | 36.28 | a | 40.78 | c | 50.70 | a | 56.62 | b | 65.96 | e | 63.95 | b | 61.61 | b | 46.07 | c | 41.55 | b | 29.00 | c | 48.46 | a |
1996 | 29.98 | b | 26.64 | g | 38.57 | b | 43.81 | a | 47.72 | a | ----- | z | 67.02 | e | 67.37 | e | 55.46 | b | 45.93 | c | 36.80 | g | 30.88 | k | 49.48 | d |
1997 | 28.32 | k | 31.10 | h | 38.46 | d | 39.09 | g | 57.04 | h | 56.44 | e | 65.91 | c | 68.07 | b | 59.63 | c | 44.23 | c | 36.54 | g | 25.30 | h | 55.46 | f |
1998 | 32.37 | e | 30.35 | e | 36.79 | l | 38.46 | d | 47.03 | a | 56.47 | 71.48 | 69.98 | a | 64.37 | c | 45.70 | a | 36.08 | j | 29.30 | d | 48.55 | b | ||
1999 | 32.48 | a | 29.73 | b | 34.36 | b | ----- | z | 47.86 | b | 55.50 | a | 65.26 | 66.90 | a | 56.15 | c | 51.07 | c | 42.31 | d | 30.76 | d | 46.58 | a | |
2000 | 27.84 | o | 31.81 | k | 36.00 | g | 46.06 | c | 50.18 | c | 61.38 | f | 67.32 | l | ----- | z | 57.50 | i | 48.36 | i | 27.90 | o | 28.75 | m | 48.12 | j |
2001 | 23.26 | j | 26.28 | j | 37.32 | n | 40.18 | k | 56.69 | 54.03 | m | 70.28 | m | 71.39 | l | 61.68 | e | 50.31 | e | 37.88 | b | 26.88 | c | 46.69 | g | |
2002 | 28.57 | b | 28.87 | a | 36.16 | i | 43.89 | b | 47.55 | b | 57.63 | 72.97 | 64.78 | o | 61.36 | a | 46.07 | a | 39.84 | a | 32.28 | a | 45.90 | b | ||
2003 | 35.03 | b | 34.11 | 45.33 | d | 41.25 | 51.19 | 60.03 | a | 73.85 | h | 69.26 | j | 59.50 | m | 52.14 | b | 33.40 | f | 30.19 | e | 43.66 | d | |||
2004 | 26.48 | e | 29.00 | g | 42.79 | g | 46.31 | d | 50.29 | j | 60.12 | f | 70.80 | h | 70.34 | i | 57.88 | j | 48.65 | g | 36.93 | h | 32.02 | j | 36.39 | j |
2005 | 27.00 | f | 32.83 | b | 40.62 | f | 42.84 | h | 51.70 | i | 55.00 | h | 70.81 | m | 67.75 | k | 59.00 | j | 48.55 | j | 34.98 | h | 24.45 | k | 32.83 | k |
2006 | 30.30 | k | 30.06 | j | 33.82 | i | 36.34 | n | 43.88 | r | 62.08 | j | 71.81 | o | 65.86 | i | 53.57 | o | 48.18 | l | 36.44 | m | 28.22 | m | ----- | z |
2007 | 24.83 | m | 32.39 | j | 40.27 | k | 42.09 | n | 49.94 | n | 57.08 | l | 71.65 | r | 66.28 | m | 52.72 | n | 43.36 | m | 36.16 | n | 29.82 | n | ----- | z |
2008 | 23.43 | j | 32.83 | h | 33.56 | n | 38.26 | i | 49.92 | l | 57.47 | l | 68.38 | j | 67.47 | l | 60.55 | h | 51.12 | j | 40.20 | o | 28.27 | i | ----- | z |
2009 | 30.92 | l | 30.38 | h | 34.38 | j | 41.95 | k | 50.64 | m | 59.83 | j | 70.02 | j | 67.56 | m | 59.67 | j | 41.98 | j | 35.50 | i | 23.95 | k | ----- | z |
2010 | 31.42 | m | 31.94 | k | 36.89 | i | 39.48 | j | 44.23 | k | 55.95 | k | 66.50 | m | 63.14 | i | 59.85 | j | 49.78 | b | 32.96 | b | 27.41 | b | 36.72 | i |
2011 | 27.29 | 29.41 | 34.40 | 38.16 | b | 44.06 | 53.47 | 64.42 | 69.31 | 63.88 | 48.36 | c | ----- | z | 29.48 | 45.66 | a | |||||||||
2012 | 31.07 | a | 31.86 | 36.70 | d | 44.27 | 51.72 | a | 56.23 | 70.00 | 70.75 | c | 64.27 | 49.08 | 37.83 | c | 27.90 | 47.64 | ||||||||
2013 | 22.19 | e | 29.88 | c | 38.63 | e | 41.86 | b | 53.06 | d | 59.83 | c | 73.42 | 68.60 | 56.38 | m | 44.57 | c | 37.84 | a | 25.84 | c | 45.07 | a | ||
2014 | 34.32 | a | 33.13 | e | 39.37 | a | 41.15 | f | 51.12 | a | 57.55 | i | 72.54 | e | 65.97 | b | 59.95 | 52.09 | b | 33.29 | i | 31.97 | 48.94 | c | ||
2015 | 33.89 | h | 39.27 | 43.11 | 43.67 | 50.15 | k | 67.58 | 67.94 | 67.92 | 58.65 | 53.50 | 31.33 | 11.97 | 48.49 | b | ||||||||||
2016 | 26.24 | 35.00 | 38.78 | b | 49.10 | 51.97 | 61.20 | 66.08 | y | 69.13 | a | 56.33 | 45.76 | 39.48 | 21.48 | 44.95 | a | |||||||||
2017 | 17.97 | 29.62 | x | 42.12 | g | 40.80 | c | 53.53 | a | 57.40 | t | ----- | z | 71.19 | 25.38 | 44.35 | 35.80 | 25.74 | 39.35 | d | ||||||
2018 | 34.18 | 29.32 | 34.03 | a | 40.58 | 54.42 | a | 57.72 | 68.09 | n | 67.18 | 57.20 | j | 44.79 | 32.60 | d | 20.73 | r | 43.87 | c | ||||||
2019 | 29.58 | 26.13 | a | 34.02 | c | ----- | z | ----- | z | 57.40 | 66.69 | 68.21 | 56.93 | 40.52 | 38.35 | 28.79 | 44.66 | b | ||||||||
2020 | 28.83 | g | 34.34 | 36.56 | 45.07 | 52.77 | 55.60 | o | 69.18 | 69.79 | 64.71 | a | 50.48 | 34.68 | 29.32 | 48.69 | b | |||||||||
2021 | 31.79 | 33.14 | c | 39.13 | 45.52 | d | 50.24 | 67.63 | 75.90 | 69.66 | 61.82 | 48.66 | 37.50 | 28.55 | 49.13 | |||||||||||
2022 | 32.45 | 32.84 | 39.40 | 38.23 | b | 43.63 | 58.47 | 72.12 | c | 74.08 | 64.48 | a | 54.15 | 25.85 | 22.19 | 46.49 | ||||||||||
2023 | 25.77 | 26.69 | a | 27.65 | 40.33 | 54.29 | 59.74 | a | 72.44 | 68.27 | 57.89 | b | 47.40 | 36.52 | 30.76 | b | 45.65 | |||||||||
2024 | 31.98 | 33.78 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.88 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 26.59 | 31.26 | 36.26 | 42.88 | 50.37 | 58.11 | 67.23 | 66.57 | 58.52 | 47.95 | 35.70 | 28.32 | 45.61 | |||||||||||||
S.D. | 5.11 | 4.14 | 3.40 | 3.51 | 3.43 | 3.59 | 3.25 | 3.14 | 5.42 | 3.54 | 3.53 | 4.00 | 1.54 | |||||||||||||
SKEW | -0.56 | 0.11 | 0.29 | -0.12 | 0.24 | 0.43 | -0.19 | -0.19 | -3.39 | 0.04 | -0.20 | -1.19 | -0.20 | |||||||||||||
MAX | 37.67 | 40.58 | 45.33 | 50.50 | 59.21 | 67.63 | 75.90 | 74.08 | 64.81 | 58.48 | 42.78 | 34.85 | 49.13 | |||||||||||||
MIN | 11.63 | 21.06 | 27.65 | 35.02 | 43.63 | 51.48 | 56.98 | 59.89 | 25.38 | 38.90 | 25.85 | 11.97 | 41.67 | |||||||||||||
YRS | 65 | 70 | 67 | 69 | 71 | 67 | 69 | 69 | 68 | 72 | 66 | 66 | 28 |