YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | 37.73 | t | 34.61 | 36.87 | a | 40.30 | 43.87 | 50.36 | b | 54.27 | a | 50.73 | a | 49.50 | 44.77 | a | 35.93 | 35.13 | 43.30 | a | ||||||
1960 | 29.87 | 34.48 | 34.33 | a | 38.57 | 43.77 | a | 48.63 | 54.10 | 51.47 | a | 50.07 | 44.97 | a | 36.47 | 33.97 | 41.72 | |||||||||
1961 | 34.87 | a | 36.75 | 36.84 | 38.63 | 44.97 | 52.30 | 53.61 | 54.65 | 45.93 | 40.45 | 32.80 | 31.70 | a | 41.96 | |||||||||||
1962 | 30.23 | 34.29 | 33.58 | 39.93 | 41.94 | 46.97 | 50.39 | 52.10 | 50.03 | 44.06 | 39.30 | 35.39 | 41.52 | |||||||||||||
1963 | 26.90 | 38.43 | 35.42 | 38.30 | 44.35 | 48.45 | a | 49.16 | 52.26 | 52.10 | 44.52 | 37.37 | 33.77 | 41.75 | ||||||||||||
1964 | 32.55 | 33.41 | 34.03 | 37.53 | 41.58 | 47.90 | 52.87 | 50.23 | a | 46.80 | 43.87 | a | 35.07 | 31.24 | b | 40.59 | ||||||||||
1965 | 32.55 | 34.26 | a | 35.47 | a | 39.67 | 41.90 | 46.30 | 52.29 | 52.70 | a | 45.24 | a | 47.84 | 42.72 | a | 34.68 | 42.13 | ||||||||
1966 | 33.52 | 33.82 | 35.10 | 40.07 | b | 42.50 | a | 46.69 | a | 50.55 | 49.90 | 50.37 | 41.55 | 38.00 | 35.71 | 41.48 | ||||||||||
1967 | 33.94 | 32.61 | 31.77 | 34.17 | 40.68 | 50.83 | 52.68 | 55.81 | 50.90 | 46.13 | a | 39.77 | 31.77 | a | 41.75 | |||||||||||
1968 | 31.96 | c | 36.81 | c | 38.42 | 37.76 | a | 44.90 | 49.43 | b | 54.35 | 53.32 | 51.41 | a | 43.10 | b | 39.70 | 30.29 | 42.62 | |||||||
1969 | 25.87 | 31.22 | a | 34.03 | 39.00 | a | 46.35 | 55.27 | 49.97 | 50.45 | 50.52 | a | 42.50 | a | 40.03 | 36.45 | 41.81 | |||||||||
1970 | 32.90 | 36.71 | 35.93 | a | 36.23 | 41.48 | 52.03 | 52.13 | 51.06 | 47.14 | a | 42.84 | 40.21 | a | 33.55 | 41.85 | ||||||||||
1971 | 31.52 | 34.61 | 32.26 | 37.03 | a | 43.61 | 46.57 | 52.58 | 53.68 | 47.63 | 41.61 | 37.60 | 32.68 | 40.95 | ||||||||||||
1972 | 29.80 | a | 32.52 | 36.84 | 35.97 | a | 45.10 | 50.83 | 53.07 | b | 52.73 | a | 45.33 | 42.06 | 38.80 | 29.72 | b | 41.06 | ||||||||
1973 | 29.52 | 34.25 | 35.48 | 38.07 | 45.48 | b | 49.33 | 52.47 | a | 48.10 | 49.07 | a | 42.86 | c | 34.60 | 36.20 | a | 41.29 | ||||||||
1974 | 28.58 | 33.57 | 34.06 | 38.53 | 41.34 | b | 50.07 | a | 53.46 | e | 54.53 | a | 53.57 | 45.32 | 40.83 | 36.48 | 42.53 | |||||||||
1975 | 32.87 | 31.44 | a | 33.16 | 33.86 | a | 41.90 | 47.43 | 53.03 | a | 50.52 | 52.45 | a | 44.16 | 36.73 | 34.74 | 41.03 | |||||||||
1976 | 34.87 | 32.59 | 31.31 | b | 37.30 | 43.32 | 46.93 | 50.52 | b | 53.06 | 51.64 | b | 44.23 | 40.56 | c | 35.10 | 41.79 | |||||||||
1977 | 30.29 | 35.50 | 33.10 | 38.87 | 41.48 | 49.21 | a | 50.23 | 55.67 | a | 47.63 | 43.67 | a | 34.70 | 35.06 | 41.28 | ||||||||||
1978 | 34.63 | a | 36.31 | b | 37.68 | 38.17 | 42.42 | 50.76 | a | 53.58 | 53.27 | a | 49.83 | 44.90 | 32.63 | 28.32 | 41.88 | |||||||||
1979 | 23.77 | a | 29.86 | 35.61 | 39.14 | a | 44.43 | a | 46.93 | a | 53.10 | 51.90 | a | 52.07 | 47.06 | 37.00 | b | 36.23 | 41.42 | |||||||
1980 | 27.03 | 34.24 | 34.81 | 39.83 | a | 43.18 | n | ----- | z | ----- | z | 50.36 | c | 49.74 | c | 46.11 | d | 40.07 | 36.37 | a | 39.84 | c | ||||
1981 | 38.03 | 35.33 | a | 38.50 | g | 39.72 | a | 46.52 | 48.90 | a | 51.63 | a | 56.16 | 52.00 | b | 44.19 | 42.50 | 35.97 | 44.63 | a | ||||||
1982 | 32.23 | a | 34.78 | e | 36.00 | e | 37.26 | c | 45.92 | e | 53.70 | c | 55.67 | g | 55.97 | b | 52.44 | e | 46.54 | g | 36.85 | c | 34.66 | b | 41.98 | b |
1983 | 37.48 | f | 38.74 | e | 41.70 | d | 40.64 | e | 47.90 | b | 49.93 | 54.00 | 55.17 | a | 48.69 | a | 43.36 | c | 41.00 | 29.34 | b | 44.59 | a | |||
1984 | 35.17 | a | 36.76 | 39.65 | 38.03 | 42.68 | c | 46.79 | b | 51.00 | a | 49.34 | b | 48.87 | 41.41 | b | 37.38 | a | 29.39 | c | 41.37 | |||||
1985 | 30.21 | b | 29.04 | a | 32.42 | 38.79 | a | 43.40 | a | 46.57 | b | 53.71 | 50.77 | a | 46.90 | 40.71 | c | 26.75 | b | 29.10 | b | 39.03 | ||||
1986 | 36.17 | a | 33.50 | 38.63 | a | 36.07 | a | 44.53 | a | 49.60 | 49.10 | 54.83 | a | 48.70 | 46.83 | b | 39.93 | a | 35.58 | 42.79 | ||||||
1987 | 32.71 | c | 37.74 | a | 39.13 | 42.69 | a | 46.81 | 50.36 | b | 53.10 | 53.03 | a | 52.70 | 45.29 | c | 42.71 | b | 32.33 | a | 44.05 | |||||
1988 | 32.93 | b | 35.96 | b | 35.73 | a | 41.29 | b | 44.48 | 48.40 | 52.90 | 51.70 | a | 49.90 | a | 49.67 | a | 38.97 | 34.61 | 43.05 | ||||||
1989 | 33.03 | 28.40 | c | 36.00 | b | 41.70 | 43.68 | 50.67 | 50.77 | 52.74 | 50.52 | a | 43.73 | a | 40.50 | b | 35.37 | a | 42.26 | |||||||
1990 | 35.41 | b | 30.41 | a | 37.16 | 42.59 | a | 45.07 | a | 49.90 | 54.90 | 54.13 | 51.70 | 40.26 | 37.90 | 28.36 | c | 42.32 | ||||||||
1991 | 32.03 | a | 39.77 | b | 34.68 | 38.93 | 43.10 | 46.32 | b | 52.65 | 52.80 | a | 50.53 | 43.77 | i | 37.17 | x | 38.55 | i | 43.42 | c | |||||
1992 | 38.05 | i | 41.33 | e | 42.32 | c | 43.88 | e | 48.77 | a | 52.10 | 55.27 | a | 53.28 | b | 49.61 | b | 46.73 | a | 39.25 | b | 31.93 | a | 45.86 | a | |
1993 | 29.73 | e | 32.52 | c | 38.30 | d | 41.23 | 48.97 | b | 49.61 | b | 52.27 | a | 53.73 | a | 50.78 | c | 47.59 | d | 33.68 | e | 33.82 | c | 42.69 | ||
1994 | 37.34 | b | 32.50 | 37.74 | 43.72 | e | 46.55 | 48.10 | a | 53.24 | b | 52.58 | 53.33 | 42.20 | a | 32.66 | a | 33.90 | a | 42.82 | ||||||
1995 | 36.59 | b | ----- | z | 36.07 | b | 38.68 | b | ----- | z | 49.37 | ----- | z | 51.97 | a | ----- | z | 44.60 | a | 43.31 | a | 35.79 | c | 42.05 | d | |
1996 | 34.23 | 32.93 | b | 36.59 | b | 41.62 | a | 43.23 | 47.97 | a | 56.62 | b | 54.59 | b | 48.63 | c | 44.87 | a | 38.83 | a | 33.81 | 42.82 | ||||
1997 | 34.35 | 35.00 | 36.35 | 39.41 | c | 48.42 | 49.55 | a | 53.19 | 56.14 | b | 53.70 | 43.78 | d | 42.63 | 35.39 | 43.99 | |||||||||
1998 | 34.97 | a | 37.81 | b | 38.68 | 41.13 | 46.84 | 51.63 | 58.33 | a | 54.84 | 52.20 | 46.43 | c | 41.48 | a | 32.58 | e | 44.74 | |||||||
1999 | 35.63 | a | 34.26 | a | 36.71 | 37.93 | c | 42.07 | d | 49.14 | a | 52.71 | 56.70 | a | 50.57 | b | 45.50 | c | 41.83 | a | 36.52 | 43.30 | ||||
2000 | 33.55 | b | 37.29 | a | 36.43 | c | 42.17 | a | 45.50 | c | 49.87 | 52.47 | a | 50.73 | a | 51.00 | c | 45.73 | a | 35.90 | 35.55 | 43.02 | ||||
2001 | 35.38 | b | 33.93 | 37.41 | b | 38.90 | 44.65 | 48.34 | a | 53.19 | 54.47 | a | 50.89 | b | 44.27 | a | 42.14 | a | 34.33 | a | 43.16 | |||||
2002 | 35.00 | a | 35.54 | d | 34.14 | b | 40.24 | e | 43.68 | c | 52.10 | 54.32 | 52.30 | a | 50.13 | 44.03 | a | 42.19 | c | 37.20 | a | 43.41 | ||||
2003 | 40.04 | e | ----- | z | 38.81 | 40.62 | a | 46.57 | a | 52.17 | a | 54.19 | 52.42 | 50.57 | ----- | z | 35.68 | b | 35.97 | a | 44.70 | b | ||||
2004 | 34.03 | b | 37.41 | 39.20 | a | 40.13 | 45.16 | 51.00 | a | 55.73 | a | 57.17 | a | 51.62 | a | 46.83 | b | 39.50 | b | 37.58 | 44.61 | |||||
2005 | 35.63 | a | 35.52 | a | 39.66 | b | 42.32 | b | 50.06 | 49.97 | a | 54.47 | a | 55.17 | a | 48.50 | b | 47.33 | a | 38.38 | a | 34.33 | d | 44.28 | ||
2006 | 36.93 | c | 33.96 | c | 36.65 | 40.27 | ----- | z | 52.48 | a | 55.60 | a | 53.32 | 51.33 | 42.94 | 38.14 | a | 35.62 | b | 43.38 | a | |||||
2007 | 31.10 | a | 36.41 | a | 39.48 | 41.20 | 45.27 | a | 49.67 | 56.52 | 53.90 | a | 48.59 | a | 43.37 | a | 37.83 | ----- | z | 43.94 | a | |||||
2008 | 30.84 | 34.39 | a | 34.45 | 36.30 | 45.41 | b | 48.21 | b | 53.63 | a | 55.71 | 50.40 | 44.26 | 42.63 | 30.96 | c | 42.27 | ||||||||
2009 | 32.12 | e | 34.36 | c | 33.20 | a | 36.72 | a | 44.47 | a | 51.60 | 57.19 | 54.96 | d | 52.90 | 43.39 | 38.53 | 31.20 | a | 42.55 | ||||||
2010 | 38.70 | a | 37.74 | a | 37.23 | a | 38.83 | 43.97 | 48.17 | a | 54.10 | 53.90 | 53.69 | a | 46.94 | 38.40 | 37.10 | 44.06 | ||||||||
2011 | 35.32 | 33.39 | 37.61 | 36.57 | 43.13 | 49.63 | 52.23 | 54.86 | b | 55.52 | a | 47.80 | a | 37.97 | 34.61 | 43.22 | ||||||||||
2012 | 34.69 | b | 37.31 | 35.23 | 41.17 | g | 44.16 | l | 49.42 | f | 55.67 | j | 55.96 | h | 51.13 | g | 45.72 | b | 42.56 | c | 35.00 | d | 38.42 | f | ||
2013 | 32.19 | e | 35.86 | g | 37.96 | c | 43.44 | n | 47.71 | 52.32 | b | 55.32 | f | 58.39 | 54.50 | 45.14 | b | 40.89 | b | 30.60 | a | 44.41 | c | |||
2014 | 37.08 | f | 32.80 | r | 38.17 | b | 41.59 | a | 48.40 | f | 48.94 | l | 58.10 | 57.76 | b | 54.17 | a | 51.00 | 40.90 | 38.68 | 47.55 | d | ||||
2015 | 39.81 | 41.40 | c | 42.42 | 41.53 | 49.19 | d | 52.67 | f | 57.24 | b | 57.06 | 50.20 | 48.45 | 35.17 | 35.37 | a | 45.26 | a | |||||||
2016 | 37.50 | e | 40.69 | 39.79 | c | 44.63 | 50.11 | d | 52.63 | c | 54.03 | a | 56.06 | 50.10 | 48.40 | a | 45.10 | 31.61 | 45.89 | |||||||
2017 | 29.29 | 34.43 | 37.26 | 40.50 | 46.70 | a | 51.45 | a | 52.42 | 57.97 | 53.27 | 43.30 | d | 39.23 | 33.10 | 43.24 | ||||||||||
2018 | 37.45 | 32.86 | 34.97 | 41.17 | a | 48.50 | a | 49.95 | h | 55.77 | e | 57.33 | a | 49.40 | 46.07 | a | 41.40 | 36.10 | 43.73 | a | ||||||
2019 | 36.74 | 30.75 | 34.00 | 41.67 | c | 47.07 | b | 50.37 | 53.87 | a | 55.61 | 51.93 | 41.68 | 39.77 | 37.61 | 43.42 | ||||||||||
2020 | 36.45 | 35.00 | g | 34.77 | 40.73 | 47.00 | 51.03 | 53.61 | 53.16 | 55.21 | b | 45.87 | 38.90 | 36.84 | 44.87 | a | ||||||||||
2021 | 36.84 | 32.54 | 35.23 | 39.32 | b | 45.16 | 54.86 | b | 54.47 | a | 55.74 | 52.45 | a | 44.68 | 42.23 | 33.23 | 43.89 | |||||||||
2022 | 34.45 | 34.64 | 37.90 | 37.31 | a | 43.50 | a | 50.80 | 56.43 | a | 56.10 | 52.57 | 50.23 | 36.30 | 32.65 | 43.57 | ||||||||||
2023 | 36.84 | 33.50 | 34.45 | 38.03 | 47.71 | 49.77 | 54.38 | b | 58.45 | 52.20 | 47.00 | 41.13 | 39.24 | b | 44.39 | |||||||||||
2024 | 33.16 | 36.96 | c | 39.64 | i | 41.00 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.06 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 33.43 | 34.82 | 36.35 | 39.41 | 44.95 | 49.80 | 53.46 | 53.77 | 50.66 | 44.84 | 38.75 | 34.09 | 42.55 | |||||||||||||
S.D. | 3.34 | 2.76 | 2.44 | 2.24 | 2.35 | 2.09 | 2.04 | 2.38 | 2.29 | 2.35 | 3.21 | 2.56 | 1.27 | |||||||||||||
SKEW | -0.50 | 0.19 | 0.31 | -0.08 | 0.32 | 0.31 | 0.17 | -0.06 | -0.27 | 0.33 | -0.93 | -0.50 | 0.08 | |||||||||||||
MAX | 40.04 | 41.40 | 42.42 | 44.63 | 50.11 | 55.27 | 58.33 | 58.45 | 55.52 | 51.00 | 45.10 | 39.24 | 45.89 | |||||||||||||
MIN | 23.77 | 28.40 | 31.31 | 33.86 | 40.68 | 46.30 | 49.10 | 48.10 | 45.24 | 40.26 | 26.75 | 28.32 | 39.03 | |||||||||||||
YRS | 62 | 61 | 64 | 63 | 60 | 60 | 60 | 64 | 63 | 62 | 64 | 63 | 48 |