YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.58 | 73.63 | 62.93 | 52.42 | ----- | z | ----- | z | 66.64 | h | ||||
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 75.70 | u | 74.29 | 65.83 | 53.90 | 39.60 | 35.15 | 53.75 | g | |||||
1958 | 32.63 | 41.02 | 42.35 | 53.40 | 64.82 | 75.05 | 76.44 | g | 77.50 | 68.14 | b | 56.23 | a | 43.89 | c | 38.29 | g | 55.50 | b | |||||||
1959 | 31.58 | 37.70 | 43.23 | 54.55 | 61.53 | 73.53 | 76.13 | a | 74.58 | 65.67 | d | 55.97 | 41.52 | a | 36.70 | a | 54.39 | |||||||||
1960 | 31.83 | a | 35.72 | 48.08 | a | 55.55 | 61.82 | a | 72.94 | e | 75.29 | 74.45 | 68.07 | 53.65 | a | 43.97 | 30.90 | 54.36 | ||||||||
1961 | 31.67 | a | 38.88 | 46.97 | a | 53.03 | 62.43 | a | 71.53 | 74.00 | 72.58 | a | 63.58 | 53.26 | b | 39.88 | b | ----- | z | 55.26 | a | |||||
1962 | 31.50 | 41.95 | 40.68 | 54.98 | 61.57 | a | 70.63 | 74.98 | 74.08 | a | 67.14 | a | 55.74 | 44.93 | c | 35.93 | b | 54.51 | ||||||||
1963 | 29.41 | b | 39.71 | 44.76 | 55.23 | 63.90 | 68.54 | b | 77.32 | 74.14 | c | 68.78 | a | 57.58 | e | 43.33 | d | 32.05 | 54.56 | |||||||
1964 | 28.60 | 28.69 | b | 41.13 | 50.32 | 62.17 | a | 68.98 | a | 76.06 | 72.79 | 65.38 | a | 55.05 | b | 41.67 | 35.03 | 52.16 | ||||||||
1965 | 36.65 | 37.88 | 43.50 | c | 53.07 | a | 59.76 | d | 67.61 | c | 75.95 | b | 72.55 | a | 64.90 | d | 55.45 | b | 46.43 | 36.44 | 54.18 | |||||
1966 | 31.03 | 33.98 | 46.55 | a | 54.68 | 65.52 | a | 70.02 | f | 77.56 | 74.71 | b | 66.74 | a | 55.34 | 46.13 | c | 35.85 | 53.46 | a | ||||||
1967 | 32.08 | 42.02 | 52.94 | d | 56.09 | a | 62.13 | e | 71.04 | b | 77.28 | d | 72.24 | b | 65.43 | b | 56.06 | e | 44.82 | b | 32.64 | f | 57.47 | a | ||
1968 | 34.76 | 42.53 | 46.10 | 51.89 | b | 61.52 | c | 71.89 | c | 74.89 | c | 71.48 | e | 63.76 | c | 57.00 | 42.97 | 31.98 | 54.23 | |||||||
1969 | 39.66 | 38.35 | a | 40.24 | b | 56.93 | c | 64.10 | a | 70.40 | a | 77.52 | a | 77.04 | c | 67.57 | a | 55.63 | 42.57 | 38.58 | 55.71 | |||||
1970 | 34.22 | a | 41.66 | 44.90 | a | 50.65 | 62.59 | c | 70.18 | 77.50 | 75.42 | a | 66.09 | c | 51.98 | 43.07 | 35.06 | 54.44 | ||||||||
1971 | 32.48 | 38.96 | 47.32 | 52.88 | 60.06 | 71.03 | 77.09 | c | 72.42 | 64.80 | 53.91 | c | 43.08 | 32.57 | a | 53.89 | ||||||||||
1972 | 35.02 | a | 41.33 | 51.56 | 55.12 | a | 60.76 | 71.48 | 75.86 | b | 73.50 | b | 66.37 | c | 57.95 | 40.32 | 34.76 | 55.34 | ||||||||
1973 | 32.77 | 38.36 | 45.10 | 49.07 | 60.92 | a | 69.56 | c | 74.22 | d | 73.35 | 65.52 | d | 55.18 | 44.52 | 34.95 | 53.63 | |||||||||
1974 | 34.31 | 36.02 | 51.42 | 52.60 | 64.17 | g | 74.90 | d | 75.18 | 72.56 | 65.47 | a | 56.62 | a | 43.13 | 30.94 | e | 53.92 | a | |||||||
1975 | 32.37 | 38.52 | 45.68 | 50.36 | a | 59.34 | b | 68.45 | 74.74 | 73.19 | d | 64.02 | g | 55.00 | 42.28 | 31.74 | 51.97 | a | ||||||||
1976 | 32.69 | 43.67 | 45.71 | b | 53.52 | 61.66 | 69.83 | 73.95 | 71.77 | c | 65.87 | 52.31 | 39.02 | a | 31.29 | 53.44 | ||||||||||
1977 | 30.33 | b | 40.17 | a | 43.03 | 54.95 | 61.62 | b | 71.35 | 75.53 | a | 75.40 | 68.00 | 56.59 | d | 45.00 | a | 39.92 | a | 55.16 | ||||||
1978 | 37.56 | 39.93 | 48.37 | a | 55.97 | 60.80 | a | 71.65 | d | 76.95 | 73.41 | b | 66.25 | b | 57.40 | a | 46.60 | a | 33.84 | 55.73 | ||||||
1979 | 33.15 | a | 38.73 | 45.79 | 53.63 | 61.29 | 68.95 | 74.65 | 71.95 | 67.53 | 57.52 | a | 40.03 | 37.62 | a | 54.24 | ||||||||||
1980 | 39.60 | 44.12 | a | 46.82 | a | 53.20 | 60.47 | 72.83 | 78.45 | 74.74 | 68.32 | 53.19 | 42.58 | 39.94 | 56.19 | |||||||||||
1981 | 37.44 | 41.62 | 47.45 | a | 57.72 | a | 63.61 | 74.35 | 77.24 | 74.68 | 67.55 | 55.58 | a | 45.63 | 38.97 | 56.82 | ||||||||||
1982 | 35.61 | i | 40.25 | f | 47.38 | k | 54.89 | h | 61.42 | e | ----- | z | 76.62 | a | 75.19 | e | 68.25 | h | 54.45 | i | 43.79 | f | 35.83 | e | 62.26 | h |
1983 | 35.20 | f | 39.98 | f | 48.46 | h | 49.77 | f | 60.91 | h | 69.54 | c | 77.05 | a | 76.50 | 72.58 | k | 58.60 | k | 49.14 | l | 38.92 | 65.50 | h | ||
1984 | 34.97 | 39.45 | 48.23 | 54.05 | 68.44 | 71.18 | 76.60 | 74.94 | 68.80 | 53.78 | a | 45.02 | 36.27 | 55.98 | ||||||||||||
1985 | 34.69 | 39.07 | 48.97 | 57.32 | 63.06 | 73.47 | a | 76.24 | 74.90 | 65.50 | 56.61 | 45.88 | 36.60 | 56.03 | ||||||||||||
1986 | 39.48 | 44.20 | a | 50.50 | 57.47 | 63.48 | 73.33 | 74.31 | 76.13 | 65.85 | 54.50 | 43.93 | 36.48 | 56.64 | ||||||||||||
1987 | 31.56 | 40.20 | 43.95 | 54.05 | 63.00 | a | 72.13 | 74.95 | 74.27 | 67.20 | 59.00 | 43.83 | a | 34.84 | 54.92 | |||||||||||
1988 | 33.02 | 42.40 | 45.60 | 54.97 | 63.87 | 73.27 | b | 77.44 | 74.92 | 65.50 | 59.06 | 44.38 | 33.32 | 55.65 | ||||||||||||
1989 | 34.21 | 41.77 | b | 51.06 | 60.05 | 66.89 | 72.90 | a | 77.05 | 74.71 | 68.40 | 55.39 | 43.70 | 34.56 | 56.72 | |||||||||||
1990 | 34.73 | 39.02 | a | 49.50 | 58.28 | 63.16 | 75.77 | 76.71 | 73.00 | 70.30 | 57.24 | 45.17 | 32.39 | 56.27 | ||||||||||||
1991 | 34.68 | 42.59 | 46.65 | 54.50 | 62.45 | 70.53 | 75.66 | 74.98 | 67.27 | 57.12 | a | 42.37 | 36.53 | 55.44 | ||||||||||||
1992 | 30.84 | 41.67 | 47.97 | 57.63 | 64.18 | 70.33 | 75.00 | 70.63 | 65.20 | 58.69 | 38.71 | a | 31.58 | 54.37 | ||||||||||||
1993 | 39.90 | 41.70 | 48.13 | 55.04 | c | 63.77 | a | 72.34 | a | 77.81 | 75.29 | 66.45 | 54.81 | 41.70 | 34.89 | 55.98 | ||||||||||
1994 | 35.40 | 37.55 | 49.95 | 55.50 | 63.74 | 75.93 | 78.68 | 77.48 | 67.72 | 50.55 | 38.40 | d | 34.03 | 55.41 | ||||||||||||
1995 | 34.53 | b | 46.82 | 49.71 | 52.30 | 61.95 | 69.20 | 73.61 | 77.65 | a | 69.75 | 56.60 | 47.50 | c | 39.18 | 56.57 | ||||||||||
1996 | 38.02 | 45.38 | c | 46.27 | a | 55.46 | c | 67.52 | b | 75.32 | b | 78.72 | a | 76.14 | b | 64.65 | c | 55.17 | b | 45.38 | a | 36.31 | b | 57.03 | ||
1997 | 33.53 | 39.87 | b | 49.62 | a | 51.56 | c | 65.21 | b | 70.25 | b | 76.70 | a | 75.55 | c | 70.84 | b | 55.65 | 42.90 | a | 31.02 | a | 55.22 | |||
1998 | 36.53 | 39.02 | a | 45.44 | 51.15 | 62.19 | 71.69 | a | ----- | z | 76.32 | 72.23 | 56.81 | e | 45.43 | b | 37.44 | 54.02 | a | |||||||
1999 | 38.36 | b | 41.83 | a | 49.55 | b | 53.17 | 63.08 | 71.66 | a | 76.66 | b | 74.90 | 67.03 | 56.10 | a | 46.08 | 33.39 | 55.98 | |||||||
2000 | 38.21 | b | 43.52 | a | 47.37 | 57.38 | 67.45 | 75.42 | 78.21 | 76.71 | 69.90 | 55.87 | 38.38 | 36.35 | 57.06 | |||||||||||
2001 | 33.40 | a | 41.36 | 47.56 | 56.18 | 67.02 | 74.47 | 78.71 | 75.61 | 68.83 | 57.52 | 47.40 | 34.13 | 56.85 | ||||||||||||
2002 | 35.55 | 36.68 | 45.48 | 60.18 | 65.50 | 76.15 | 77.23 | 75.69 | 67.77 | 54.84 | 42.77 | 35.16 | 56.08 | |||||||||||||
2003 | 39.61 | 40.23 | 46.29 | 54.37 | 65.40 | 72.65 | 80.89 | 77.56 | 68.77 | 60.13 | 44.67 | 35.15 | 57.14 | |||||||||||||
2004 | 36.35 | 36.26 | 51.95 | a | 54.77 | 64.97 | 72.35 | 75.98 | 73.37 | 66.15 | 56.00 | 43.30 | 34.60 | 55.50 | ||||||||||||
2005 | 40.32 | 43.16 | 46.33 | b | 54.57 | 65.27 | 72.66 | b | 79.24 | 75.66 | 70.73 | 57.82 | 44.72 | 35.53 | 57.17 | |||||||||||
2006 | 36.52 | 41.30 | 47.35 | 58.95 | 68.23 | 76.08 | 79.03 | 74.15 | 64.07 | 55.21 | 46.08 | 32.76 | 56.64 | |||||||||||||
2007 | 30.78 | a | 40.25 | 48.79 | 54.23 | 64.66 | 74.77 | 78.47 | a | 78.79 | 69.92 | 55.79 | 46.55 | 35.65 | 56.55 | |||||||||||
2008 | 31.58 | 39.21 | 46.48 | 53.10 | 62.89 | 75.20 | 77.55 | 76.02 | 68.00 | 56.48 | 44.16 | a | 37.92 | 55.72 | ||||||||||||
2009 | 37.47 | 42.36 | 48.79 | 54.97 | 67.94 | d | 73.19 | a | 79.48 | 75.31 | 67.62 | d | 54.53 | b | 44.15 | 32.16 | 56.50 | |||||||||
2010 | 34.11 | c | 38.09 | 44.18 | 55.82 | 62.00 | 75.48 | a | 78.41 | b | 76.05 | 70.93 | 58.50 | 41.80 | 38.94 | 56.19 | ||||||||||
2011 | 32.55 | a | 34.38 | 50.02 | 56.85 | d | 59.66 | b | 73.57 | 80.02 | 79.32 | a | 69.19 | a | 56.45 | 43.22 | 31.65 | 55.57 | ||||||||
2012 | 37.60 | 40.19 | 47.82 | 58.90 | a | 66.37 | 76.35 | 79.03 | 77.65 | 69.12 | 57.81 | 44.50 | 35.29 | 57.55 | ||||||||||||
2013 | 30.40 | 35.84 | 48.13 | 56.12 | 65.52 | 77.38 | 77.87 | 75.89 | 69.20 | 53.23 | a | 42.87 | 33.47 | 55.49 | ||||||||||||
2014 | 35.05 | 44.30 | 48.34 | 54.77 | 62.25 | a | 75.15 | 78.65 | 72.88 | a | 71.37 | 58.26 | 43.38 | 38.24 | 56.89 | |||||||||||
2015 | 34.68 | 42.55 | 50.74 | 54.88 | 62.26 | 76.45 | 76.74 | 76.65 | 70.97 | 59.53 | 44.28 | 34.74 | 57.04 | |||||||||||||
2016 | 34.18 | 41.88 | 50.55 | 55.15 | 62.12 | a | 76.95 | 79.68 | a | 73.30 | a | 68.42 | 59.63 | 46.98 | 36.71 | 57.13 | ||||||||||
2017 | 37.37 | 44.00 | 51.97 | 55.07 | 63.23 | 75.70 | 78.76 | 74.27 | 67.92 | 55.45 | 47.32 | 35.18 | 57.19 | |||||||||||||
2018 | 33.23 | 41.48 | 46.58 | 56.97 | 66.60 | 75.42 | 77.71 | 74.81 | 68.28 | 55.40 | 39.90 | 33.26 | 55.80 | |||||||||||||
2019 | 32.39 | 38.38 | 49.45 | 56.05 | 60.15 | 71.73 | 79.19 | 77.56 | 70.80 | 53.40 | 42.08 | 36.58 | 55.65 | |||||||||||||
2020 | 35.73 | 40.00 | 50.50 | 56.60 | 67.66 | 73.38 | a | 79.23 | 78.29 | 66.30 | 56.58 | 47.83 | 33.45 | 57.13 | ||||||||||||
2021 | 34.61 | 39.09 | 46.11 | 55.65 | 64.92 | 76.67 | 77.31 | 75.32 | 69.95 | 53.95 | 45.62 | 37.27 | 56.37 | |||||||||||||
2022 | 33.90 | 34.55 | 45.13 | 56.67 | 65.90 | 74.07 | 79.23 | 75.24 | 69.62 | 54.84 | 38.82 | 36.40 | 55.36 | |||||||||||||
2023 | 34.82 | 37.00 | 44.45 | 53.28 | 65.19 | 71.98 | 82.39 | 77.13 | 69.07 | 57.31 | 44.02 | 36.56 | 56.10 | |||||||||||||
2024 | 35.71 | 42.45 | 47.03 | 52.06 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.73 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 34.52 | 40.04 | 47.20 | 54.90 | 63.51 | 72.79 | 77.15 | 74.93 | 67.56 | 55.88 | 43.57 | 35.17 | 55.72 | |||||||||||||
S.D. | 2.79 | 3.07 | 2.80 | 2.29 | 2.34 | 2.46 | 1.80 | 1.85 | 2.12 | 1.95 | 2.40 | 2.35 | 1.14 | |||||||||||||
SKEW | 0.24 | -0.78 | -0.28 | -0.09 | 0.34 | -0.05 | 0.18 | 0.07 | 0.03 | -0.16 | -0.46 | 0.00 | -0.70 | |||||||||||||
MAX | 40.32 | 46.82 | 52.94 | 60.18 | 68.44 | 77.38 | 82.39 | 79.32 | 72.23 | 60.13 | 47.83 | 39.94 | 57.55 | |||||||||||||
MIN | 28.60 | 28.69 | 40.24 | 49.07 | 59.34 | 67.61 | 73.61 | 70.63 | 62.93 | 50.55 | 38.38 | 30.90 | 52.16 | |||||||||||||
YRS | 65 | 65 | 65 | 64 | 64 | 64 | 65 | 68 | 65 | 66 | 65 | 64 | 57 |