YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.76 | 36.07 | c | 32.22 | b | 39.35 | i | |
1946 | 32.45 | a | 33.93 | 37.29 | 44.64 | a | 51.83 | a | 54.71 | a | 63.34 | c | 62.40 | 54.00 | 41.36 | b | 34.45 | 35.44 | 45.49 | |||||||
1947 | 29.40 | 37.36 | 41.58 | a | 45.55 | 55.13 | 53.02 | 60.37 | 59.09 | d | 56.85 | 48.26 | 37.12 | 34.55 | a | 46.52 | ||||||||||
1948 | 32.50 | a | 29.76 | 34.65 | 40.45 | 47.16 | 57.72 | 58.95 | b | 59.32 | a | 52.55 | a | 45.72 | b | 35.72 | a | 23.35 | 43.15 | |||||||
1949 | 16.16 | c | 29.20 | a | 36.71 | 46.27 | 52.85 | 55.43 | 60.03 | 59.32 | c | 54.90 | 41.92 | a | 43.61 | b | 29.52 | 43.83 | ||||||||
1950 | 18.00 | a | 34.09 | 35.34 | b | 40.87 | c | 47.85 | 55.57 | b | 64.07 | a | 65.63 | 56.52 | a | 47.53 | a | 40.85 | c | 40.24 | 45.55 | |||||
1951 | 29.03 | 33.96 | a | 35.02 | 44.14 | b | 49.67 | a | 56.72 | c | 64.23 | a | 59.46 | d | 58.06 | d | 43.97 | b | 37.98 | e | 28.32 | f | 46.57 | a | ||
1952 | 28.84 | 36.98 | i | 33.95 | c | 47.02 | c | 49.16 | b | 54.84 | a | 65.26 | d | 63.30 | a | 59.83 | a | 52.77 | a | 33.34 | a | 31.19 | b | 47.23 | a | |
1953 | 40.08 | 35.20 | 38.50 | c | 41.10 | a | 45.55 | b | 50.43 | b | 61.81 | b | 60.20 | c | 58.27 | b | 47.50 | a | 42.37 | 36.12 | c | 46.43 | ||||
1954 | 29.85 | a | 39.50 | 32.81 | 43.02 | 50.53 | 53.23 | 62.55 | 57.13 | 54.02 | 45.23 | 43.35 | 32.63 | 45.32 | ||||||||||||
1955 | 30.43 | a | 30.66 | 32.97 | b | 36.43 | a | 45.98 | a | 56.53 | 58.63 | a | 61.32 | a | 54.76 | c | 47.34 | 33.95 | a | 30.74 | 43.31 | |||||
1956 | 32.16 | 29.59 | b | 36.55 | c | 45.02 | c | 52.05 | c | 53.67 | 64.18 | 60.87 | 56.67 | 44.74 | 37.17 | a | 37.18 | 45.82 | ||||||||
1957 | 18.82 | 34.27 | 38.48 | a | 43.80 | 52.18 | 57.48 | a | 59.84 | 57.56 | 58.38 | 44.34 | 35.23 | 36.58 | a | 44.75 | ||||||||||
1958 | 35.15 | 40.82 | 35.37 | 41.78 | 56.02 | 58.67 | 65.68 | 66.74 | 55.02 | 50.24 | 39.82 | 39.72 | b | 48.75 | ||||||||||||
1959 | 34.10 | b | 31.80 | 39.27 | 42.98 | 45.90 | a | 56.07 | 63.87 | 59.58 | 53.03 | 48.02 | 38.17 | a | 33.23 | 45.50 | ||||||||||
1960 | 27.50 | 31.19 | 39.22 | a | 43.52 | 46.87 | 57.32 | 67.02 | a | 60.60 | 57.80 | 49.24 | 36.05 | 34.58 | 45.91 | |||||||||||
1961 | 36.58 | a | 39.81 | b | 37.92 | 43.43 | b | 46.98 | a | 62.22 | 65.00 | 66.29 | 50.67 | a | 45.77 | 35.73 | 31.67 | d | 46.84 | |||||||
1962 | 29.71 | b | 34.80 | 34.97 | 46.19 | c | 43.95 | 52.92 | 58.74 | b | 57.88 | a | 56.23 | 46.97 | b | 41.41 | c | 37.04 | f | 45.80 | a | |||||
1963 | 27.39 | d | 41.93 | e | 38.48 | d | 39.85 | d | 49.12 | c | 53.96 | d | 57.56 | g | 60.47 | a | 60.96 | c | 47.58 | 38.77 | 33.47 | 44.73 | a | |||
1964 | 31.55 | a | 33.29 | a | 32.04 | d | 37.88 | a | 44.45 | c | ----- | z | 61.60 | b | 57.83 | d | 52.55 | b | 47.40 | a | 35.04 | b | 29.19 | g | 43.36 | b |
1965 | 32.61 | d | 34.97 | i | ----- | z | 43.39 | b | 46.55 | 54.68 | 62.21 | c | 60.75 | c | 49.91 | b | 52.05 | b | 40.81 | a | 31.76 | 47.47 | b | |||
1966 | 34.41 | b | 33.45 | 38.50 | a | 41.94 | d | 49.44 | 54.10 | a | 59.02 | j | 59.62 | b | 57.06 | c | 48.43 | a | 41.08 | d | 34.32 | a | 44.76 | a | ||
1967 | 34.78 | b | 37.81 | a | 34.68 | a | 36.80 | c | 48.92 | 57.40 | 64.66 | c | 68.07 | a | 61.03 | 49.10 | 38.45 | a | 30.47 | 46.85 | ||||||
1968 | 32.37 | 37.24 | 41.35 | 40.03 | a | 49.43 | c | 56.52 | b | 64.55 | 60.00 | a | 56.11 | b | 46.03 | a | 37.91 | a | 29.50 | e | 45.92 | |||||
1969 | 23.10 | b | 29.20 | 36.37 | 42.60 | a | 52.83 | b | 59.03 | 61.82 | c | 60.48 | b | 55.93 | c | 43.39 | 39.98 | a | 33.70 | a | 44.87 | |||||
1970 | 32.82 | 36.25 | b | 36.60 | e | 36.47 | 48.97 | 60.84 | b | 63.85 | 62.78 | b | 50.32 | 44.35 | a | 37.07 | a | 30.44 | 45.06 | |||||||
1971 | 33.87 | 34.28 | a | 35.33 | a | 40.47 | a | 48.53 | a | 52.98 | 65.05 | 66.61 | 51.41 | a | 41.98 | c | 37.81 | a | 29.02 | b | 44.78 | |||||
1972 | 30.76 | 35.81 | 41.61 | 39.74 | a | 50.97 | 57.72 | 63.78 | b | 63.89 | d | 52.37 | 44.58 | 38.59 | c | 25.34 | c | 45.43 | ||||||||
1973 | 28.93 | a | 35.74 | a | 37.43 | a | 42.79 | a | 52.02 | 57.20 | e | 64.33 | b | 61.71 | b | 56.65 | f | 46.13 | d | 35.43 | a | 35.69 | 45.22 | a | ||
1974 | 26.32 | 35.20 | c | 37.34 | c | 40.27 | d | 45.82 | a | 60.88 | e | 60.03 | b | 62.10 | 57.50 | 47.65 | 39.57 | b | 33.58 | 45.52 | ||||||
1975 | 32.75 | a | 31.66 | 33.27 | c | 36.75 | 46.26 | d | 53.00 | e | 65.31 | b | 58.05 | b | 56.57 | b | 47.12 | b | 37.20 | c | 35.40 | b | 44.45 | |||
1976 | 35.55 | a | 33.19 | 35.53 | 40.47 | a | 48.04 | c | 50.35 | c | 61.30 | c | 58.79 | b | 56.69 | a | 46.25 | g | 40.79 | d | 33.32 | a | 44.91 | a | ||
1977 | 28.13 | d | 35.62 | 35.48 | h | 44.57 | b | 44.73 | e | 58.76 | c | 61.23 | c | 67.12 | c | 51.16 | e | 46.07 | c | 36.07 | b | 34.81 | d | 46.21 | a | |
1978 | ----- | z | ----- | z | ----- | z | 41.88 | f | 46.26 | b | 56.70 | b | 62.50 | d | 60.41 | d | 52.26 | e | 47.46 | d | ----- | z | ----- | z | 54.26 | f |
1979 | 15.43 | c | 34.34 | f | 39.67 | a | 41.26 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.83 | b | 33.41 | c | 37.43 | b | 36.17 | f |
1980 | 27.55 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.77 | g | 39.55 | 39.52 | 35.54 | i | ||
1981 | 32.38 | c | 34.98 | a | 38.57 | b | 40.98 | g | 46.63 | l | 50.50 | a | 55.92 | e | ----- | z | 50.63 | k | ----- | z | ----- | z | ----- | z | 42.47 | g |
1982 | 25.43 | k | 31.26 | g | 36.77 | e | 37.88 | i | 46.03 | b | 55.59 | g | 58.80 | c | 60.02 | h | 49.77 | j | 40.08 | k | 31.19 | i | 29.25 | i | 47.20 | i |
1983 | 34.73 | g | 34.63 | i | 38.44 | n | 36.96 | d | 48.31 | e | 51.77 | h | 59.25 | e | 64.54 | h | 51.62 | r | 41.65 | r | 36.43 | h | 21.74 | f | 48.17 | i |
1984 | 33.32 | i | 36.58 | i | 40.82 | f | 39.44 | c | 47.56 | e | 52.54 | d | 63.40 | g | 62.38 | c | 51.92 | f | 42.77 | a | 36.46 | f | 27.82 | l | 48.94 | g |
1985 | 27.00 | k | 31.86 | g | 34.78 | f | ----- | z | 48.74 | h | 57.11 | g | 66.62 | e | 66.08 | e | 51.78 | e | 43.80 | d | 22.83 | d | 24.65 | g | 50.22 | g |
1986 | 38.97 | l | 35.98 | b | 43.71 | g | 41.43 | c | 48.48 | f | 61.74 | e | 58.52 | h | 66.70 | d | 52.32 | e | 48.27 | e | 38.96 | d | 32.66 | b | 47.26 | d |
1987 | ----- | z | 36.89 | e | 36.90 | j | 48.83 | g | 54.42 | f | 60.70 | b | 60.42 | e | 60.60 | f | 57.10 | e | 50.19 | e | 37.83 | g | 30.96 | e | 49.38 | f |
1988 | 30.52 | a | 38.23 | c | 40.16 | f | 45.40 | e | 48.15 | g | 55.93 | b | 62.81 | d | 61.46 | c | 52.48 | j | 55.35 | e | 38.12 | b | 32.11 | c | 46.66 | c |
1989 | 32.20 | c | 22.52 | d | 38.48 | f | 47.92 | 47.85 | e | 57.54 | b | 60.26 | d | 58.91 | c | 54.22 | c | 46.05 | b | 40.75 | d | 36.29 | c | 45.86 | a | |
1990 | 34.50 | e | 33.67 | d | 41.82 | i | ----- | z | 46.62 | c | 56.43 | b | 65.21 | b | 63.55 | c | 59.70 | c | 47.05 | b | 40.57 | i | 23.87 | d | 47.85 | c |
1991 | 30.73 | e | ----- | z | ----- | z | ----- | z | 44.86 | j | 50.80 | 63.33 | e | 64.29 | g | 57.46 | e | 48.28 | d | 39.80 | c | 31.94 | f | 48.40 | f | |
1992 | 36.76 | d | 38.57 | h | 41.04 | h | 45.98 | d | ----- | z | 61.15 | c | ----- | z | 63.26 | f | 56.20 | t | 51.09 | d | 37.63 | c | 27.62 | g | 46.52 | g |
1993 | 20.90 | e | 26.93 | h | 40.43 | c | 44.52 | a | 56.17 | k | 55.43 | i | 54.65 | g | 58.94 | n | 56.95 | k | 49.65 | e | 29.75 | f | 35.35 | e | 38.17 | g |
1994 | 38.98 | 33.61 | f | 41.22 | d | 46.69 | c | 50.72 | f | 55.96 | d | 65.94 | g | 61.17 | b | 59.52 | d | 43.91 | c | 31.81 | c | 32.88 | c | 45.79 | c | |
1995 | 33.29 | 40.65 | d | 36.98 | c | 41.72 | c | 51.94 | g | 55.91 | c | 62.70 | d | 58.79 | c | 57.71 | a | 44.75 | c | 42.08 | e | 31.21 | b | 45.98 | a | |
1996 | 32.52 | 31.66 | 38.90 | 45.22 | a | 45.72 | b | ----- | z | 64.98 | 64.22 | b | 53.38 | e | 45.03 | 38.72 | 33.84 | 44.93 | a | |||||||
1997 | 32.31 | 33.46 | 39.62 | c | 41.58 | d | 52.30 | c | 52.69 | c | 60.72 | d | 63.91 | d | 56.24 | a | 44.12 | c | 39.40 | a | 31.80 | a | 45.68 | |||
1998 | 34.83 | b | 35.75 | 39.00 | b | 41.92 | 46.83 | a | 54.86 | b | 65.53 | 62.57 | a | 57.82 | 44.38 | b | 38.72 | a | 30.84 | b | 46.09 | |||||
1999 | 35.08 | 34.52 | b | 36.31 | 39.72 | c | 45.96 | c | 52.52 | b | 60.75 | c | 63.04 | e | 53.54 | c | 47.56 | f | 43.95 | a | 33.29 | 45.33 | a | |||
2000 | 29.93 | a | 34.90 | c | 36.86 | b | 46.83 | c | 50.34 | c | 57.54 | c | 61.39 | c | 60.21 | c | 54.50 | 45.60 | a | 31.36 | a | 31.98 | c | 45.12 | ||
2001 | 31.95 | c | 32.26 | a | 39.16 | b | 39.67 | c | 51.76 | b | 51.90 | a | 61.15 | 64.28 | b | 58.83 | 46.83 | a | 41.17 | a | 30.34 | b | 45.77 | |||
2002 | 32.90 | a | 35.76 | g | 35.47 | 42.89 | b | 46.98 | c | 59.10 | d | 65.16 | c | 59.25 | c | 53.63 | o | 41.31 | 39.12 | a | 33.78 | b | 45.60 | b | ||
2003 | 38.29 | c | 33.80 | 41.43 | a | 41.38 | b | 48.06 | f | 58.28 | e | 66.00 | a | 63.19 | b | 58.89 | b | 49.91 | c | 32.90 | 33.12 | a | 47.02 | a | ||
2004 | 31.90 | a | 35.09 | a | 42.93 | b | 45.04 | b | 48.55 | c | 54.68 | e | 64.00 | c | 64.86 | c | 53.62 | b | 47.02 | d | 38.03 | 36.26 | 46.83 | |||
2005 | 33.40 | 33.70 | c | 40.53 | 43.46 | d | 51.31 | b | 52.42 | 63.84 | c | 62.34 | 51.74 | a | 47.29 | 35.27 | 28.58 | 45.32 | ||||||||
2006 | 35.33 | a | 30.39 | 34.84 | 42.64 | a | 50.52 | k | 57.71 | a | 65.98 | c | 59.78 | d | 54.44 | e | 45.25 | a | 37.86 | a | 33.67 | a | 45.26 | a | ||
2007 | 29.82 | a | 35.82 | 41.93 | b | 42.45 | a | 50.05 | b | 56.30 | b | 66.59 | b | 60.56 | d | 54.00 | a | 45.33 | e | 37.88 | b | 31.40 | b | 46.01 | ||
2008 | 27.40 | g | 35.09 | a | 35.07 | b | 36.00 | a | 49.38 | c | 53.10 | a | 62.52 | d | 62.33 | e | 54.90 | a | 47.28 | a | 42.02 | a | 27.34 | b | 45.91 | a |
2009 | 32.20 | c | 34.07 | a | 33.97 | b | 40.73 | 50.48 | 56.28 | a | 65.15 | d | 63.79 | c | 57.47 | a | 42.44 | g | 38.17 | a | 29.29 | c | 45.60 | a | ||
2010 | 36.75 | c | 36.72 | a | 37.57 | a | 40.44 | d | 45.66 | 52.70 | 61.50 | a | 59.35 | 55.45 | 47.27 | 35.26 | a | 31.40 | 45.01 | |||||||
2011 | 33.78 | a | 30.30 | 37.62 | a | 38.43 | 44.15 | d | 52.52 | c | 57.86 | b | 61.63 | 60.05 | 46.21 | 34.27 | b | 32.71 | 44.13 | |||||||
2012 | 33.47 | 32.17 | 36.15 | 42.58 | 47.30 | a | 52.10 | 62.10 | 62.79 | 56.61 | b | 46.08 | 39.67 | 29.84 | 45.07 | |||||||||||
2013 | 30.24 | 33.82 | 38.27 | 40.25 | 49.60 | 55.17 | 63.35 | 62.36 | b | 55.53 | 42.87 | 35.12 | 28.84 | 44.62 | ||||||||||||
2014 | 33.74 | 27.41 | 38.05 | 42.20 | 49.53 | 54.17 | 65.15 | 62.26 | 55.58 | 49.42 | 32.45 | 32.13 | 45.17 | |||||||||||||
2015 | 37.02 | 37.50 | 42.89 | 40.85 | 50.53 | 61.33 | 63.45 | 62.37 | 52.92 | 50.50 | 31.93 | 30.21 | 46.79 | |||||||||||||
2016 | 32.44 | 39.03 | 37.42 | 46.33 | 49.76 | 55.18 | 58.98 | b | 61.15 | 53.75 | 46.77 | 43.98 | 23.94 | 45.73 | ||||||||||||
2017 | 23.00 | 33.96 | 41.47 | a | 41.10 | a | 49.62 | a | 55.79 | a | 64.18 | c | 65.44 | 56.93 | 44.19 | 38.70 | 28.48 | 45.24 | ||||||||
2018 | 35.82 | 31.86 | 36.56 | 42.15 | 52.50 | a | 54.47 | 63.98 | 62.58 | 52.57 | a | 45.42 | a | 37.65 | 32.33 | a | 45.66 | |||||||||
2019 | 34.16 | 26.30 | 34.00 | e | 45.00 | 51.35 | a | 55.73 | 61.40 | 64.87 | 55.35 | 43.61 | i | 38.28 | 35.34 | 45.62 | a | |||||||||
2020 | 35.53 | 35.10 | 36.05 | 43.95 | 50.77 | 55.72 | 63.03 | 64.66 | 59.77 | 49.16 | 38.85 | 34.87 | 47.29 | |||||||||||||
2021 | 35.77 | 32.44 | a | 38.03 | 43.45 | 50.66 | 63.95 | 68.63 | 64.21 | 57.68 | 46.73 | 42.93 | 31.68 | 48.01 | ||||||||||||
2022 | 36.76 | 35.21 | 41.00 | 38.77 | 46.11 | 55.98 | 67.10 | 69.02 | 59.47 | 51.34 | 32.10 | 28.32 | 46.76 | |||||||||||||
2023 | 33.82 | 34.00 | 33.40 | 43.10 | 54.00 | 57.70 | 66.10 | 66.18 | 55.97 | 47.95 | 39.17 | 38.65 | 47.50 | |||||||||||||
2024 | 31.26 | 35.36 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.31 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.46 | 34.17 | 37.46 | 42.14 | 48.90 | 55.85 | 62.92 | 62.14 | 55.61 | 46.82 | 37.70 | 32.45 | 45.66 | |||||||||||||
S.D. | 4.99 | 3.43 | 2.67 | 2.84 | 2.75 | 3.01 | 2.57 | 2.77 | 2.76 | 2.75 | 3.56 | 3.53 | 1.15 | |||||||||||||
SKEW | -1.40 | -0.50 | 0.14 | -0.20 | 0.31 | 0.39 | -0.32 | 0.37 | -0.06 | 0.35 | -1.01 | -0.28 | 0.28 | |||||||||||||
MAX | 40.08 | 41.93 | 42.93 | 47.92 | 56.02 | 63.95 | 68.63 | 69.02 | 61.03 | 55.35 | 43.98 | 40.24 | 48.75 | |||||||||||||
MIN | 15.43 | 22.52 | 32.04 | 36.00 | 43.95 | 50.35 | 55.92 | 57.13 | 49.91 | 41.31 | 22.83 | 23.35 | 43.15 | |||||||||||||
YRS | 71 | 65 | 64 | 70 | 64 | 70 | 69 | 69 | 67 | 71 | 71 | 68 | 42 |