YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.93 | 35.28 | f | 28.93 | k | |
1930 | 15.79 | b | 36.93 | a | ----- | z | ----- | z | 39.58 | 44.10 | 46.16 | ----- | z | ----- | z | ----- | z | 34.43 | ----- | z | 36.17 | f | ||||
1931 | ----- | z | 34.83 | d | 37.30 | h | 38.88 | d | 44.38 | b | 51.00 | b | 52.97 | a | 53.26 | 52.03 | ----- | z | ----- | z | ----- | z | 46.77 | e | ||
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 55.67 | v | 48.03 | 50.70 | 45.68 | 33.63 | 34.35 | 42.48 | g | |||||
1941 | 32.52 | 33.11 | 38.27 | a | 38.33 | 43.77 | a | 45.27 | 49.23 | 50.61 | 47.13 | 40.89 | d | 37.80 | 36.29 | 41.10 | ||||||||||
1942 | 26.90 | 33.68 | 33.58 | 39.27 | 43.55 | 46.57 | 52.80 | k | ----- | z | 42.86 | p | 41.52 | 37.47 | 37.32 | 37.76 | c | |||||||||
1943 | 25.53 | a | 31.04 | a | 33.87 | 41.57 | 40.33 | a | 44.33 | 46.97 | 49.77 | 43.70 | 42.67 | a | 33.13 | 28.00 | 38.41 | |||||||||
1944 | 28.35 | 31.59 | 31.03 | 37.87 | 39.84 | 43.17 | 45.23 | 46.84 | 46.67 | 43.71 | 35.63 | 29.35 | 38.27 | |||||||||||||
1945 | 32.38 | b | 35.56 | a | 33.84 | 37.93 | a | 44.65 | 41.83 | a | 44.97 | 46.55 | 43.37 | 39.06 | 38.77 | 32.80 | a | 39.31 | ||||||||
1946 | 33.03 | 35.85 | a | 34.43 | a | 36.47 | 41.90 | 46.20 | 46.00 | 45.03 | 42.60 | 38.03 | 32.43 | 33.97 | a | 38.83 | ||||||||||
1947 | 27.81 | 33.93 | 35.32 | 39.27 | 40.55 | 45.87 | 46.29 | 44.87 | 41.43 | 41.58 | 37.57 | 34.10 | 39.05 | |||||||||||||
1948 | 29.65 | 30.76 | 31.97 | 35.17 | 41.76 | b | 50.43 | 44.44 | d | 45.81 | 41.77 | 36.23 | 33.00 | 28.27 | a | 37.44 | ||||||||||
1949 | 17.10 | 29.68 | 33.32 | 35.70 | 41.87 | 40.27 | 45.32 | 48.96 | c | 42.93 | b | 32.27 | a | 36.48 | a | 32.34 | b | 36.35 | ||||||||
1950 | 19.39 | 30.64 | 33.48 | 35.14 | a | 37.35 | 46.83 | 44.81 | 47.45 | 39.27 | 40.55 | 38.27 | 38.71 | 37.66 | ||||||||||||
1951 | 32.45 | 32.18 | 30.76 | b | 34.77 | 37.42 | 44.97 | 46.29 | 43.55 | 41.10 | 38.74 | 35.77 | 30.71 | 37.39 | ||||||||||||
1952 | 29.26 | 33.34 | 34.55 | 33.73 | 38.97 | 44.77 | 47.44 | o | 51.93 | b | 45.58 | k | 39.00 | a | 28.37 | 34.06 | 36.80 | b | ||||||||
1953 | 39.48 | 33.64 | 34.94 | 36.26 | c | 39.90 | 44.23 | 48.35 | 50.58 | 43.37 | 40.83 | a | 38.43 | 35.45 | 40.46 | |||||||||||
1954 | 32.68 | 33.04 | 31.19 | 36.10 | a | 41.00 | ----- | z | ----- | z | 49.03 | 43.53 | 35.35 | 38.10 | 32.35 | 37.24 | b | |||||||||
1955 | 32.26 | 32.30 | a | 32.10 | a | 34.77 | 37.72 | f | 48.15 | q | 48.81 | 44.90 | a | 43.07 | 41.68 | 32.37 | 33.03 | 37.53 | b | |||||||
1956 | 34.03 | 28.66 | 34.52 | 38.03 | 43.94 | 45.53 | 49.55 | 50.44 | m | 44.70 | 39.84 | 29.77 | 31.57 | c | 38.19 | a | ||||||||||
1957 | 20.39 | 29.96 | 35.37 | a | 37.60 | 43.48 | 47.88 | e | 47.57 | c | 47.35 | 47.72 | a | 43.07 | b | 31.50 | 37.19 | 39.09 | ||||||||
1958 | 36.27 | a | 41.67 | a | 34.14 | b | 39.54 | b | 45.94 | 53.53 | 53.45 | 50.71 | 45.86 | a | 40.26 | 38.61 | b | 37.04 | c | 43.08 | ||||||
1959 | 33.70 | a | 34.21 | 34.62 | e | 38.00 | 41.97 | a | 49.62 | a | 49.90 | 46.46 | g | 47.97 | 42.76 | b | 33.90 | 30.65 | e | 39.75 | a | |||||
1960 | 30.87 | a | 33.86 | a | 36.18 | c | 40.17 | 43.39 | 44.83 | 48.16 | 49.20 | a | 46.00 | b | 42.57 | a | 37.15 | c | 28.68 | c | 40.09 | |||||
1961 | 33.65 | 39.27 | b | 38.19 | 38.48 | a | 44.23 | 47.43 | 51.13 | 52.58 | 43.66 | a | 39.90 | 30.96 | b | 33.90 | 41.12 | |||||||||
1962 | 29.03 | a | 32.29 | 34.10 | 38.93 | 42.30 | a | 45.60 | 47.94 | 51.06 | 46.76 | a | 42.87 | 39.43 | 34.06 | 40.36 | ||||||||||
1963 | 25.90 | a | 37.41 | a | 33.75 | c | 39.87 | 42.23 | 49.29 | b | 47.95 | i | 50.52 | 49.52 | a | 43.60 | a | 38.76 | a | 32.32 | 40.29 | a | ||||
1964 | 35.84 | 30.71 | a | 34.94 | 36.27 | 40.19 | 46.87 | 50.29 | 48.90 | 44.13 | 39.35 | 33.54 | d | 32.06 | 39.43 | |||||||||||
1965 | 33.65 | 34.32 | 32.96 | c | 37.97 | 39.35 | 43.52 | a | 52.00 | b | 52.79 | b | 42.23 | 42.26 | 39.39 | b | 30.48 | 40.08 | ||||||||
1966 | 33.13 | 32.00 | 34.87 | 37.72 | a | 38.66 | b | 45.60 | 48.97 | 48.10 | 47.97 | 38.87 | 37.70 | 38.37 | a | 40.16 | ||||||||||
1967 | 37.87 | 32.68 | 34.71 | 35.13 | 40.61 | 48.67 | 47.55 | 49.94 | 47.20 | 42.90 | 35.97 | 34.74 | 40.66 | |||||||||||||
1968 | 32.83 | b | 34.96 | a | 38.10 | 37.00 | c | 44.00 | 47.13 | 44.68 | 49.71 | 47.97 | 40.23 | 37.17 | 31.90 | 40.47 | ||||||||||
1969 | 26.52 | 32.48 | a | 32.65 | 39.43 | 43.94 | 53.83 | 49.55 | 46.97 | a | 48.63 | 40.48 | 37.17 | 35.35 | h | 41.06 | a | |||||||||
1970 | 32.35 | 34.25 | 33.68 | 36.67 | 40.68 | 48.40 | 49.68 | 47.77 | a | 44.67 | 38.39 | 37.67 | 32.71 | 39.74 | ||||||||||||
1971 | 33.45 | 33.93 | a | 32.71 | c | 37.17 | 42.90 | a | 46.80 | 51.74 | 51.23 | 45.17 | 39.94 | 38.80 | 33.20 | a | 40.59 | |||||||||
1972 | 31.68 | 34.66 | 39.35 | 37.03 | 44.94 | 48.87 | 52.30 | u | ----- | z | 44.89 | b | 37.71 | c | 36.60 | 29.63 | a | 38.54 | b | |||||||
1973 | 30.70 | a | 34.11 | a | 36.77 | 37.27 | 43.71 | 49.03 | 51.17 | a | 46.97 | 48.37 | 42.58 | 37.64 | b | 37.86 | b | 41.35 | ||||||||
1974 | 29.68 | 35.50 | 36.70 | d | 41.47 | 42.77 | a | 48.87 | 50.67 | j | 51.97 | 47.27 | 37.00 | ----- | z | 36.03 | 40.72 | b | ||||||||
1975 | ----- | z | ----- | z | 30.94 | 34.54 | b | 40.65 | e | ----- | z | 50.42 | 47.62 | e | 45.67 | 45.55 | 36.21 | a | 34.90 | a | 40.72 | c | ||||
1976 | 34.73 | a | 33.65 | l | 33.71 | 38.70 | c | 42.87 | 45.69 | a | ----- | z | ----- | z | 49.21 | a | 40.00 | 36.45 | a | 32.50 | a | 39.32 | c | |||
1977 | 25.70 | a | 34.04 | 35.19 | 38.97 | 43.26 | 48.77 | 48.84 | 54.71 | 48.90 | a | 41.84 | 37.37 | 37.87 | 41.29 | |||||||||||
1978 | 36.55 | 38.93 | a | 39.13 | a | 41.13 | 43.68 | 51.47 | 52.74 | 52.55 | i | 51.00 | 41.00 | 31.30 | 30.38 | b | 41.57 | a | ||||||||
1979 | 25.72 | b | 32.94 | k | 37.03 | a | 40.33 | 42.77 | 45.70 | 50.30 | a | 50.13 | 48.70 | 44.71 | 33.27 | 37.61 | 41.48 | a | ||||||||
1980 | 25.26 | 33.41 | 36.68 | 40.13 | 43.67 | a | 48.27 | 50.87 | a | 47.68 | 45.87 | 38.26 | 39.13 | 36.16 | 40.45 | |||||||||||
1981 | 31.83 | a | 33.82 | 36.81 | 40.23 | 44.55 | 48.33 | 50.13 | 51.52 | 46.70 | 39.00 | 36.97 | 35.68 | 41.30 | ||||||||||||
1982 | 31.42 | 33.93 | 34.35 | 35.20 | 41.77 | a | 49.48 | a | 50.30 | a | 50.93 | a | 47.70 | 39.84 | 33.37 | 32.97 | 40.10 | |||||||||
1983 | 36.29 | 39.18 | 40.74 | 36.90 | 44.90 | 48.45 | a | 51.90 | 51.60 | a | 43.37 | 37.90 | a | 41.40 | 29.58 | 41.85 | ||||||||||
1984 | 32.81 | 34.66 | 40.10 | a | 39.03 | 42.68 | 46.41 | a | 47.90 | a | 47.29 | 45.50 | 41.03 | 36.97 | 30.42 | 40.40 | ||||||||||
1985 | 24.32 | 29.64 | 32.84 | 39.30 | 42.19 | 45.43 | 50.45 | 47.13 | 43.50 | 38.48 | 28.80 | 23.06 | 37.10 | |||||||||||||
1986 | 32.81 | 34.82 | 38.45 | 36.40 | 42.61 | 49.69 | a | 49.33 | a | 50.32 | 45.63 | 40.03 | 37.00 | a | 30.06 | 40.60 | ||||||||||
1987 | 30.23 | 34.56 | a | 37.52 | 38.43 | 45.10 | 45.43 | 50.94 | 47.45 | 44.67 | 35.68 | 37.50 | 30.55 | 39.84 | ||||||||||||
1988 | 30.48 | 31.93 | a | 34.35 | 40.13 | 43.45 | 46.57 | 48.68 | 47.10 | 43.83 | 44.16 | 38.97 | 31.81 | 40.12 | ||||||||||||
1989 | 34.19 | 24.75 | 35.87 | 38.90 | 43.87 | 48.93 | 50.10 | 50.68 | 43.00 | 40.16 | 37.14 | a | 32.52 | b | 40.01 | |||||||||||
1990 | 34.39 | 31.14 | 35.45 | 40.77 | 43.65 | 50.13 | 52.00 | a | 53.23 | 49.27 | 37.39 | 37.50 | 25.87 | 40.90 | ||||||||||||
1991 | 28.68 | 36.37 | a | 33.81 | 38.63 | 43.23 | 46.43 | 50.42 | 51.84 | 45.14 | a | 37.19 | 39.37 | 35.63 | d | 40.56 | ||||||||||
1992 | 34.88 | g | 37.07 | 36.90 | a | 42.90 | a | 43.63 | a | 48.97 | 53.34 | b | 49.27 | a | 44.31 | a | 42.17 | a | 36.14 | a | 31.65 | 42.39 | a | |||
1993 | 27.61 | 27.71 | 36.93 | a | 42.17 | a | 47.71 | 49.30 | 51.39 | 51.23 | a | 43.38 | a | 40.45 | 28.33 | 31.39 | 39.80 | |||||||||
1994 | 34.90 | 31.18 | 36.00 | 40.67 | 45.42 | 46.93 | 50.52 | 50.84 | 48.20 | 36.73 | a | 33.77 | 33.97 | 40.76 | ||||||||||||
1995 | 34.97 | 33.32 | 35.32 | 38.21 | a | 44.65 | 49.30 | 53.48 | 48.26 | 50.73 | 40.39 | 41.83 | 34.27 | a | 42.06 | |||||||||||
1996 | 34.45 | 30.28 | 36.07 | a | 41.33 | 43.71 | 46.60 | 51.94 | 48.93 | a | 44.21 | a | 39.68 | 37.07 | 34.16 | 40.70 | ||||||||||
1997 | 33.17 | a | 30.78 | a | 36.87 | 38.70 | 45.77 | 47.67 | 50.19 | 53.16 | 48.57 | 41.10 | 38.53 | 31.87 | 41.36 | |||||||||||
1998 | 36.71 | 37.43 | 37.07 | a | 38.50 | 47.00 | a | 49.70 | 55.58 | 50.19 | 45.66 | a | 40.06 | 41.60 | 31.90 | a | 42.62 | |||||||||
1999 | 34.84 | 36.68 | 35.10 | 35.50 | 40.97 | 49.45 | a | 49.74 | 53.16 | 41.60 | 38.20 | a | 41.24 | a | 34.65 | 40.93 | ||||||||||
2000 | 31.16 | 34.00 | a | 33.43 | a | 39.63 | 45.29 | 48.10 | 50.29 | 48.45 | 47.33 | 40.16 | 30.40 | 32.10 | 40.03 | |||||||||||
2001 | 31.71 | 29.21 | 35.55 | 38.00 | 42.26 | 47.87 | 51.71 | 52.93 | a | 46.17 | 39.61 | 39.47 | 32.00 | 40.54 | ||||||||||||
2002 | 34.03 | 31.04 | 33.32 | 38.48 | a | 42.00 | a | 48.67 | 51.06 | 48.90 | b | 44.30 | 37.26 | 35.33 | 35.10 | 39.96 | ||||||||||
2003 | 36.19 | 32.46 | 39.10 | a | 40.48 | a | 43.90 | 49.17 | 50.65 | 49.87 | 47.50 | 46.17 | a | 34.28 | a | 35.03 | a | 42.07 | ||||||||
2004 | 31.84 | 34.86 | 37.52 | 39.43 | 46.77 | 50.67 | 53.93 | a | 55.61 | 48.47 | 44.06 | 36.10 | 35.26 | 42.88 | ||||||||||||
2005 | 33.16 | 29.00 | 36.39 | 41.60 | 48.84 | 49.33 | 52.81 | 50.65 | 43.37 | 46.52 | 33.93 | 32.42 | 41.50 | |||||||||||||
2006 | 39.32 | 29.79 | 35.97 | 39.70 | ----- | z | 50.83 | 52.35 | 48.81 | 45.80 | 37.94 | 38.56 | c | 29.96 | h | 41.91 | b | |||||||||
2007 | 25.67 | g | 35.00 | c | 37.41 | i | 38.00 | e | 41.53 | a | 47.90 | a | 53.83 | a | 51.24 | b | 45.42 | d | 39.81 | e | 33.78 | c | 33.42 | e | 41.99 | b |
2008 | 29.67 | d | 33.19 | b | 33.29 | g | 35.67 | c | 45.96 | c | 46.10 | 49.84 | 53.45 | 46.27 | 40.17 | a | 39.50 | 30.29 | 40.92 | a | ||||||
2009 | 30.06 | 28.68 | 34.48 | 37.03 | 43.16 | 50.37 | 54.23 | 52.73 | a | 47.83 | 40.32 | 36.97 | 27.06 | 40.24 | ||||||||||||
2010 | 39.68 | 36.75 | 36.65 | 39.27 | 42.90 | 47.10 | 50.39 | 50.84 | 50.77 | 41.35 | 36.43 | 36.00 | 42.34 | |||||||||||||
2011 | 33.13 | 30.96 | 37.61 | 36.07 | 41.77 | 47.90 | a | 49.65 | 51.35 | 48.73 | 43.58 | 34.27 | 29.16 | 40.35 | ||||||||||||
2012 | 31.48 | 33.31 | 34.32 | 39.47 | 41.42 | 47.47 | 51.94 | 50.77 | 43.83 | 41.39 | 39.70 | 35.61 | 40.89 | |||||||||||||
2013 | 29.65 | 33.93 | 36.00 | 37.97 | 44.77 | 49.60 | 50.77 | 54.06 | 52.13 | 37.26 | 34.73 | 27.90 | 40.73 | |||||||||||||
2014 | 31.03 | 31.11 | 36.32 | 38.83 | a | 45.06 | 47.70 | 52.68 | 53.10 | 48.23 | 47.26 | 36.57 | 36.23 | 42.01 | ||||||||||||
2015 | 32.68 | 36.50 | 36.42 | 36.37 | 44.77 | 49.43 | 52.71 | 51.23 | 44.97 | 44.58 | 33.60 | 36.19 | 41.62 | |||||||||||||
2016 | 34.29 | 36.93 | 37.65 | 40.53 | 45.77 | 47.67 | 51.68 | 49.90 | 45.30 | 46.23 | 43.00 | 30.03 | 42.41 | |||||||||||||
2017 | 24.84 | 33.46 | 37.42 | 38.23 | 44.45 | 50.00 | 49.94 | 52.45 | 48.80 | 38.13 | 38.57 | 29.61 | 40.49 | |||||||||||||
2018 | 37.13 | 32.21 | 32.90 | 39.27 | 45.55 | 46.47 | 51.45 | 51.68 | 44.40 | 40.68 | 35.77 | 33.45 | 40.91 | |||||||||||||
2019 | 32.42 | 29.00 | 30.52 | 40.13 | 44.61 | 47.07 | 51.48 | 52.61 | 50.80 | 35.65 | 33.30 | 34.29 | 40.16 | |||||||||||||
2020 | 38.42 | 31.69 | 32.35 | 36.90 | 44.52 | 49.03 | 50.45 | 49.90 | 49.73 | 41.74 | 35.43 | 33.29 | 41.12 | |||||||||||||
2021 | 36.03 | 33.57 | 32.16 | 34.13 | 41.52 | 50.93 | 51.35 | 51.94 | 45.50 | 41.39 | 39.03 | 33.48 | 40.92 | |||||||||||||
2022 | 32.29 | 30.54 | 36.58 | 34.63 | 42.00 | 48.23 | 52.68 | 53.90 | 49.20 | 44.61 | 30.63 | 31.94 | 40.60 | |||||||||||||
2023 | 35.06 | 29.79 | 32.13 | 37.70 | 45.45 | 45.13 | 51.42 | 53.94 | 48.27 | 43.13 | 34.33 | 36.74 | 41.09 | |||||||||||||
2024 | 32.61 | 35.66 | 35.84 | 37.93 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.70 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.54 | 33.22 | 35.18 | 38.19 | 43.06 | 47.65 | 50.13 | 50.10 | 46.15 | 40.62 | 36.04 | 32.95 | 40.40 | |||||||||||||
S.D. | 4.63 | 2.90 | 2.25 | 2.03 | 2.21 | 2.37 | 2.47 | 2.53 | 2.75 | 2.82 | 3.22 | 3.02 | 1.36 | |||||||||||||
SKEW | -1.11 | 0.11 | 0.08 | -0.13 | -0.24 | -0.25 | -0.52 | -0.28 | 0.05 | 0.03 | -0.48 | -0.46 | -0.76 | |||||||||||||
MAX | 39.68 | 41.67 | 40.74 | 42.90 | 48.84 | 53.83 | 55.58 | 55.61 | 52.13 | 47.26 | 43.00 | 38.71 | 43.08 | |||||||||||||
MIN | 15.79 | 24.75 | 30.52 | 33.73 | 37.35 | 40.27 | 44.44 | 43.55 | 39.27 | 32.27 | 28.33 | 23.06 | 36.35 | |||||||||||||
YRS | 82 | 83 | 82 | 84 | 83 | 82 | 78 | 79 | 83 | 84 | 85 | 82 | 65 |