YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1932 | 27.00 | d | 25.67 | 41.16 | b | 42.05 | 50.34 | 59.67 | 61.00 | 59.65 | 57.37 | 45.81 | 39.70 | 23.06 | 44.37 | |||||||||||
1933 | 23.65 | a | 22.73 | 37.31 | 43.77 | 44.90 | 57.43 | 64.77 | 61.90 | 52.40 | 49.73 | 37.53 | 34.60 | 44.23 | ||||||||||||
1934 | 34.85 | 38.11 | 45.77 | 49.48 | 54.35 | 55.72 | 62.13 | 63.32 | 55.18 | 47.81 | b | 40.28 | 33.34 | 48.36 | ||||||||||||
1935 | 27.18 | 35.36 | 34.63 | 43.42 | 51.02 | 58.35 | 62.72 | a | 62.94 | 58.05 | 44.93 | b | 34.07 | 31.73 | 45.36 | |||||||||||
1936 | 33.34 | 35.64 | 39.29 | 47.03 | 52.92 | 58.83 | 65.45 | 64.21 | 55.45 | 49.87 | 36.22 | 29.53 | 47.32 | |||||||||||||
1937 | 12.88 | b | 28.43 | 39.05 | 42.10 | 53.73 | 58.47 | 66.26 | 61.97 | 57.25 | 49.55 | 39.52 | 35.15 | 45.36 | ||||||||||||
1938 | 34.52 | 29.55 | 35.27 | 44.80 | 51.00 | 61.23 | 67.10 | 61.73 | 58.62 | 47.40 | 34.48 | 32.26 | 46.50 | |||||||||||||
1939 | 29.76 | 30.14 | 41.35 | 49.42 | 53.52 | 57.20 | 65.87 | 65.26 | 56.08 | d | 48.39 | 40.03 | 37.25 | a | 47.86 | |||||||||||
1940 | 36.21 | 37.76 | 42.27 | 46.53 | 55.02 | 63.53 | 63.10 | 64.82 | 54.78 | 48.00 | 35.82 | 33.50 | 48.45 | |||||||||||||
1941 | 34.50 | 38.29 | 40.81 | 43.38 | 52.47 | a | 55.75 | 65.74 | 61.13 | 51.77 | 45.32 | 40.88 | 32.44 | 46.87 | ||||||||||||
1942 | 26.44 | 32.52 | 36.94 | 43.63 | 47.63 | 55.93 | 65.50 | a | 63.53 | 55.88 | 48.31 | 37.95 | 33.69 | 45.66 | ||||||||||||
1943 | 28.48 | 32.25 | 40.77 | 49.25 | 53.50 | 53.42 | 67.45 | 64.37 | 64.40 | 48.31 | 39.63 | 32.85 | 47.89 | |||||||||||||
1944 | 30.04 | g | 34.22 | 38.81 | 43.67 | 53.42 | 56.33 | 67.05 | 64.37 | 60.07 | 52.48 | 33.18 | 32.27 | 48.72 | a | |||||||||||
1945 | 32.50 | 36.46 | 37.55 | 44.48 | a | 52.55 | 59.18 | 69.89 | 66.08 | 57.72 | 52.19 | 37.23 | 31.68 | 48.13 | ||||||||||||
1946 | 28.66 | b | 31.61 | a | 40.03 | 48.25 | 55.35 | 58.15 | 67.44 | 67.94 | 56.97 | 43.61 | 37.03 | a | 33.97 | 47.42 | ||||||||||
1947 | 27.66 | 40.39 | 43.18 | 48.95 | 59.32 | 56.73 | 63.45 | 62.52 | 58.90 | 49.27 | 36.93 | 33.89 | 48.43 | |||||||||||||
1948 | 34.63 | 32.72 | 35.81 | 39.93 | 49.35 | 60.72 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.19 | f | ||||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | 37.16 | f | 37.47 | 43.43 | 51.65 | 57.32 | 66.07 | a | 64.27 | 56.44 | c | 48.48 | b | 40.98 | c | 37.85 | g | 51.79 | c | |||||
1951 | 31.37 | 33.46 | 35.85 | 48.37 | 51.84 | 60.60 | 64.66 | 62.74 | 58.82 | 45.30 | a | 37.83 | 24.47 | 46.28 | ||||||||||||
1952 | 25.05 | 31.76 | 34.90 | 47.13 | 53.53 | a | 55.80 | 67.52 | e | 62.47 | a | 59.38 | 50.97 | 32.73 | 27.46 | f | 47.39 | a | ||||||||
1953 | 35.60 | 35.70 | 36.62 | a | 42.19 | a | 45.24 | 52.27 | 64.69 | 60.79 | 59.10 | 46.11 | 40.07 | 33.36 | b | 45.98 | ||||||||||
1954 | 30.56 | 37.30 | 34.67 | a | 44.85 | 54.55 | 55.03 | 63.37 | 56.68 | 51.55 | 43.13 | 38.42 | 29.65 | a | 44.98 | |||||||||||
1955 | 24.78 | a | 29.31 | b | 36.97 | 38.88 | a | 50.13 | 58.87 | 61.05 | 62.73 | 53.95 | a | 47.68 | 34.50 | 33.92 | f | 45.35 | a | |||||||
1956 | 32.53 | a | 26.34 | 36.95 | 46.45 | 52.29 | 56.48 | 64.00 | 60.24 | 56.00 | 42.03 | 36.47 | 29.40 | 44.93 | ||||||||||||
1957 | 24.00 | 35.79 | 39.38 | a | 43.98 | 52.31 | 60.93 | 62.58 | a | 60.39 | 60.17 | 44.92 | 35.95 | 33.85 | a | 46.19 | ||||||||||
1958 | 33.23 | 40.19 | a | 35.39 | 42.77 | 57.23 | 59.40 | 66.53 | 67.58 | 57.28 | a | 51.77 | 40.20 | 38.03 | 49.13 | |||||||||||
1959 | 34.81 | 32.25 | 39.19 | 47.88 | 48.65 | 60.66 | a | 67.56 | 63.02 | b | 54.98 | 50.18 | a | 38.13 | 27.45 | 47.06 | ||||||||||
1960 | 29.21 | 33.71 | 41.05 | 43.52 | 49.73 | a | 62.27 | 69.06 | 62.61 | 59.88 | 48.21 | 35.77 | d | 32.68 | 47.31 | |||||||||||
1961 | 34.50 | 36.14 | c | 38.45 | 44.43 | 49.92 | a | 63.35 | 65.72 | b | 66.90 | b | 54.68 | b | 48.00 | 35.62 | a | 30.85 | 47.38 | |||||||
1962 | 22.19 | 30.07 | a | 36.78 | a | 47.70 | 48.56 | 58.15 | 63.26 | 61.77 | 59.71 | a | 48.36 | b | 43.22 | l | 34.14 | i | 47.66 | b | ||||||
1963 | 28.84 | 42.41 | 38.04 | d | 38.98 | 53.63 | 56.75 | 60.43 | a | 61.12 | a | 60.18 | 49.63 | a | 38.74 | a | 33.13 | 46.82 | ||||||||
1964 | 28.47 | 25.76 | 35.32 | 41.92 | 49.44 | 56.00 | a | 64.40 | 61.84 | 54.68 | 50.95 | 35.59 | a | 33.72 | b | 44.84 | ||||||||||
1965 | 29.55 | 36.63 | b | 39.37 | 46.12 | 50.32 | 58.58 | 64.68 | a | 61.90 | 54.10 | 50.75 | a | 37.38 | 27.42 | a | 46.40 | |||||||||
1966 | 31.15 | g | ----- | z | 41.54 | h | 47.40 | a | 56.15 | a | 56.52 | b | 61.90 | 64.95 | 59.53 | 49.05 | b | 36.48 | f | 34.26 | 53.72 | d | ||||
1967 | 32.82 | 37.46 | b | 35.47 | 36.08 | 52.58 | 59.53 | a | 67.82 | 68.76 | b | 61.25 | 47.73 | a | 40.15 | 23.48 | b | 46.93 | ||||||||
1968 | 29.29 | 40.47 | 41.19 | b | 44.23 | 51.63 | a | 60.63 | 68.65 | 61.37 | 57.78 | 48.76 | 38.25 | b | 28.73 | 47.58 | ||||||||||
1969 | 28.66 | 32.48 | 38.18 | 43.67 | 57.13 | 59.95 | a | 65.66 | 63.55 | 59.38 | 44.58 | 39.05 | a | 34.29 | 47.22 | |||||||||||
1970 | 34.08 | 39.04 | 38.65 | a | 39.43 | 53.58 | a | 62.73 | 67.85 | a | 65.06 | 54.77 | 47.05 | b | 40.77 | 27.92 | 47.58 | |||||||||
1971 | 32.35 | 34.62 | 35.26 | d | 42.30 | 51.08 | 57.52 | a | 66.12 | b | 67.53 | 54.10 | a | 43.30 | d | 37.78 | a | 23.84 | b | 45.48 | ||||||
1972 | 24.15 | d | 35.95 | 43.93 | a | 42.53 | a | 53.65 | 62.03 | 67.27 | a | 65.23 | 54.70 | 47.00 | c | 36.10 | 24.95 | b | 46.46 | |||||||
1973 | 29.13 | 37.73 | ----- | z | 45.34 | a | 57.32 | a | 60.68 | 66.55 | 63.37 | 57.62 | ----- | z | 36.83 | ----- | z | 50.51 | c | |||||||
1974 | 28.81 | 33.82 | c | 38.98 | a | 42.38 | a | 50.92 | a | 62.84 | a | 64.38 | a | 64.87 | 61.15 | 48.68 | 39.35 | 31.98 | d | 47.35 | ||||||
1975 | 24.89 | h | 33.21 | d | 37.19 | 38.22 | 52.19 | 58.00 | b | 65.76 | 60.81 | 60.92 | 46.00 | 35.85 | 32.96 | d | 47.37 | a | ||||||||
1976 | 34.38 | g | 34.52 | f | 35.39 | c | 41.75 | 53.73 | a | 56.33 | 66.03 | 59.48 | 59.13 | 49.07 | a | 41.12 | a | 30.28 | f | 51.34 | c | |||||
1977 | 15.00 | i | 32.39 | f | 34.26 | d | 47.10 | 45.45 | 63.30 | 64.35 | 65.85 | a | 56.25 | 48.92 | 37.84 | b | 34.13 | d | 49.75 | b | ||||||
1978 | 37.30 | c | 37.37 | a | 45.22 | b | 43.37 | c | 51.09 | b | 59.64 | a | 65.27 | 62.92 | 54.07 | b | 51.21 | 34.42 | 26.27 | 47.35 | ||||||
1979 | 29.69 | b | 35.14 | 42.53 | 43.78 | 54.63 | a | 59.78 | 65.93 | a | 62.92 | 60.47 | 51.97 | 34.43 | 34.52 | 47.98 | ||||||||||
1980 | 33.94 | 40.05 | 37.48 | 46.80 | 50.77 | a | 55.15 | 65.48 | a | 62.38 | a | 58.62 | 50.47 | 38.98 | 32.63 | 47.73 | ||||||||||
1981 | 36.18 | 36.91 | 39.90 | a | 46.95 | 52.48 | 59.90 | 65.10 | 66.82 | 59.12 | 46.58 | 41.30 | 36.74 | 49.00 | ||||||||||||
1982 | 28.74 | b | 35.13 | b | 36.46 | d | 38.82 | e | 51.92 | e | 59.88 | e | 63.50 | e | 63.75 | g | 54.55 | j | 45.82 | f | 34.25 | d | 28.79 | e | 41.94 | c |
1983 | 32.26 | b | 37.44 | d | 39.21 | b | 39.38 | d | 53.94 | e | 55.50 | f | 59.91 | i | 63.80 | i | 56.32 | h | 48.86 | f | 34.64 | e | 31.19 | d | 38.29 | e |
1984 | 29.47 | b | 34.25 | c | 40.23 | e | 40.76 | i | 52.79 | c | 57.57 | c | 67.20 | f | 63.77 | g | 55.43 | i | 42.31 | g | 35.11 | c | 24.71 | b | 39.16 | e |
1985 | 26.32 | c | 32.70 | h | 35.94 | f | 47.54 | f | 50.66 | l | 62.04 | g | 67.65 | d | 61.11 | h | 51.45 | h | ----- | z | 27.87 | c | 28.59 | d | 37.61 | h |
1986 | 39.24 | b | 39.34 | c | ----- | z | ----- | z | 53.54 | g | ----- | z | 62.62 | f | 67.23 | e | 50.92 | j | 47.48 | g | 37.20 | e | 30.52 | f | 45.75 | h |
1987 | 28.00 | b | 35.93 | e | 38.57 | h | 49.02 | e | 54.45 | i | 62.52 | g | 60.12 | c | 64.54 | e | 58.39 | h | 52.67 | b | 39.26 | a | 28.12 | a | 44.71 | d |
1988 | 25.17 | d | 34.42 | c | 39.72 | f | 46.02 | g | 49.41 | b | 59.30 | g | 66.81 | j | 64.46 | h | 56.61 | l | 53.64 | f | 36.94 | d | 28.68 | c | 34.92 | g |
1989 | 19.21 | b | 22.62 | d | 40.07 | d | 48.50 | j | 51.95 | b | 60.52 | g | ----- | z | 59.88 | g | 55.90 | j | 44.82 | c | 34.68 | e | 28.23 | c | 34.51 | e |
1990 | 29.04 | g | 29.16 | c | ----- | z | ----- | z | 47.20 | i | 54.72 | g | 63.12 | f | 61.11 | h | 55.77 | h | ----- | z | 35.85 | c | 22.52 | d | 29.18 | i |
1991 | 30.83 | d | 40.35 | h | 35.46 | f | 41.55 | h | ----- | z | ----- | z | 66.91 | h | 63.90 | f | 59.05 | j | 46.36 | i | 36.26 | e | 28.56 | g | 33.55 | j |
1992 | 30.25 | c | 36.30 | g | 40.25 | g | ----- | z | 59.73 | g | 62.86 | l | 65.06 | f | ----- | z | 56.17 | g | 47.74 | h | 35.35 | c | 23.54 | e | 29.71 | i |
1993 | 20.42 | f | 25.44 | c | 40.94 | f | ----- | z | 54.50 | g | 55.55 | j | 58.34 | i | 61.74 | j | 56.38 | e | 46.34 | i | 29.42 | d | 27.98 | d | 34.81 | h |
1994 | 31.85 | d | 31.04 | e | 39.79 | j | 44.24 | g | 54.48 | i | 59.27 | h | ----- | z | 63.48 | f | 58.46 | e | 45.40 | j | 29.80 | h | 28.22 | f | 40.45 | i |
1995 | 36.02 | d | 41.25 | h | 37.94 | e | 41.67 | j | 52.58 | f | 57.05 | h | 63.15 | g | 60.98 | h | 57.76 | k | 45.50 | g | 42.48 | a | 35.48 | 37.98 | h | |
1996 | 32.50 | b | 36.74 | 40.27 | 44.95 | a | 49.73 | a | 58.69 | a | 66.76 | h | 64.57 | a | 54.57 | 44.12 | n | 37.50 | c | 32.95 | c | 45.25 | b | |||
1997 | 30.67 | b | 33.35 | a | 39.30 | i | 42.98 | i | 55.13 | h | 56.31 | i | 62.67 | e | 62.59 | i | 55.74 | g | 43.58 | l | 38.56 | f | 27.96 | d | 38.67 | h |
1998 | 35.21 | g | 34.09 | f | 38.67 | h | 41.35 | d | 46.20 | k | 56.96 | f | 67.25 | i | 65.43 | i | 58.07 | h | 43.14 | i | 34.87 | d | 24.59 | h | 38.11 | j |
1999 | 30.50 | f | 30.67 | e | 35.04 | h | 41.33 | i | 48.90 | j | 56.50 | j | 61.97 | l | 61.38 | g | 56.77 | j | 47.47 | l | 40.61 | c | 29.67 | g | 35.64 | j |
2000 | 31.54 | e | 36.67 | e | 37.67 | h | 47.94 | l | 52.71 | l | 61.92 | j | 64.02 | g | 64.72 | f | 55.88 | i | 46.60 | g | 31.77 | f | 33.06 | d | 33.75 | i |
2001 | 31.92 | f | 31.90 | h | 41.19 | g | 40.18 | h | ----- | z | 57.95 | i | 63.71 | e | 66.29 | g | 58.61 | h | 47.76 | n | 38.45 | j | 30.94 | d | 47.33 | j |
2002 | 28.32 | f | 35.98 | h | 36.52 | g | 44.90 | j | 51.43 | h | 61.50 | i | 68.72 | h | 62.04 | h | 57.80 | j | 48.36 | f | 38.08 | e | 34.17 | b | 36.13 | j |
2003 | 39.44 | e | 33.64 | f | 40.00 | e | 39.52 | h | 52.10 | g | 61.61 | g | 71.04 | g | 64.35 | g | 60.78 | g | 52.34 | f | 35.40 | f | 33.90 | e | 37.78 | i |
2004 | 32.41 | d | 35.62 | d | 44.50 | g | 46.42 | f | 51.98 | i | 60.98 | j | 66.74 | d | 65.33 | g | 55.82 | k | 47.44 | e | 36.00 | e | 33.34 | b | 41.93 | f |
2005 | 31.29 | c | 35.93 | e | 40.38 | g | 43.57 | h | 52.85 | h | ----- | z | 69.00 | g | 66.78 | k | 54.07 | i | 47.48 | g | 36.67 | d | 32.72 | b | 34.15 | h |
2006 | 34.26 | d | 32.92 | h | 33.10 | g | 44.25 | f | ----- | z | 63.12 | f | ----- | z | 63.48 | f | 58.02 | h | 45.97 | m | 38.39 | g | 32.63 | a | 33.45 | j |
2007 | 27.67 | g | 34.36 | j | 42.40 | j | 45.36 | i | 54.20 | i | 58.42 | j | 68.78 | f | 64.85 | k | 54.93 | i | 45.83 | g | 37.54 | f | 28.07 | k | ----- | z |
2008 | 25.21 | j | 31.32 | i | 35.76 | j | 39.38 | j | 51.36 | j | 58.26 | g | 66.72 | k | 65.75 | c | 58.78 | a | 48.60 | 41.25 | 28.47 | 48.57 | g | |||
2009 | 33.29 | 36.07 | 37.87 | a | 44.40 | 55.94 | 60.00 | 68.05 | 64.03 | 61.86 | a | 46.19 | 36.73 | 26.90 | 47.61 | |||||||||||
2010 | 36.81 | 35.55 | 38.55 | 40.33 | 45.50 | 57.48 | 66.10 | 63.32 | 57.30 | 50.84 | 35.18 | 34.32 | 46.77 | |||||||||||||
2011 | 30.97 | 31.00 | 37.43 | a | 40.70 | 46.37 | 55.57 | 63.15 | 65.02 | 60.92 | 47.66 | 36.80 | 29.69 | 45.44 | ||||||||||||
2012 | 32.40 | 34.28 | 38.23 | 45.63 | 52.23 | a | 56.62 | 64.84 | 66.13 | 60.38 | 49.67 | a | 39.65 | 30.71 | 47.56 | |||||||||||
2013 | 23.52 | 33.14 | 40.97 | 44.82 | 52.58 | 61.67 | 69.31 | 64.02 | 57.33 | 44.06 | 38.62 | a | 24.00 | 46.17 | ||||||||||||
2014 | 32.15 | 37.23 | 41.97 | 45.78 | 53.85 | 60.23 | 71.47 | 67.11 | 61.17 | 52.08 | 40.28 | 37.10 | 50.04 | |||||||||||||
2015 | 36.56 | 40.61 | 45.26 | 45.18 | 54.27 | 65.15 | g | ----- | z | 67.05 | 59.03 | 53.47 | a | 34.17 | 30.02 | 46.56 | b | |||||||||
2016 | 31.60 | 39.97 | 41.94 | 50.45 | 53.87 | 61.93 | a | 65.77 | 66.92 | 56.85 | 46.95 | 41.72 | 27.98 | 48.83 | ||||||||||||
2017 | 24.65 | 36.64 | 42.50 | 42.82 | 55.53 | 62.68 | 70.55 | 69.84 | 60.13 | 46.94 | 39.10 | 29.39 | 48.40 | |||||||||||||
2018 | 37.85 | 32.48 | 36.85 | 45.85 | 55.05 | a | 59.62 | 68.47 | 65.73 | 57.05 | a | 48.42 | a | 37.33 | a | 32.11 | 48.07 | |||||||||
2019 | 35.15 | 29.21 | 37.76 | 48.20 | 52.48 | 60.25 | 65.05 | 66.31 | 55.88 | 43.55 | 38.40 | 33.97 | 47.18 | |||||||||||||
2020 | 33.92 | 35.59 | 38.06 | 46.68 | 53.35 | a | 60.32 | 65.69 | 67.61 | 62.13 | 50.60 | 36.47 | 30.79 | b | 48.43 | |||||||||||
2021 | 33.11 | 34.84 | 37.61 | 47.00 | 53.77 | 65.65 | 72.08 | 66.94 | 59.27 | 47.63 | 39.85 | 30.05 | 48.98 | |||||||||||||
2022 | 34.00 | a | 34.59 | 42.84 | 42.03 | 49.02 | 60.00 | 69.87 | 69.69 | 61.80 | 50.84 | 30.93 | 28.13 | a | 47.81 | |||||||||||
2023 | 29.77 | 32.38 | 32.52 | 44.08 | 55.40 | 60.20 | 69.13 | 66.94 | 56.82 | 49.23 | 39.67 | 36.35 | 47.71 | |||||||||||||
2024 | 35.45 | 35.74 | 34.27 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.60 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.82 | 34.23 | 38.76 | 44.31 | 52.18 | 58.97 | 65.71 | 64.14 | 57.71 | 48.17 | 37.29 | 30.92 | 47.10 | |||||||||||||
S.D. | 4.62 | 4.14 | 2.83 | 3.12 | 2.95 | 2.62 | 2.55 | 2.63 | 2.69 | 2.60 | 2.74 | 3.70 | 1.30 | |||||||||||||
SKEW | -0.93 | -0.73 | 0.39 | -0.26 | -0.44 | -0.02 | 0.11 | -0.10 | -0.13 | -0.23 | -0.72 | -0.47 | -0.29 | |||||||||||||
MAX | 39.44 | 42.41 | 45.77 | 50.45 | 59.32 | 65.65 | 72.08 | 69.84 | 64.40 | 53.47 | 42.48 | 38.03 | 50.04 | |||||||||||||
MIN | 12.88 | 22.63 | 32.52 | 36.08 | 44.90 | 52.27 | 60.13 | 56.68 | 51.55 | 42.03 | 27.87 | 22.52 | 44.23 | |||||||||||||
YRS | 78 | 77 | 69 | 69 | 70 | 66 | 68 | 67 | 67 | 66 | 81 | 78 | 52 |