YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 48.60 | a | 57.89 | 57.29 | 68.52 | a | 68.98 | 84.05 | 89.73 | 88.03 | a | 79.83 | 67.87 | 57.92 | 49.35 | 68.17 | ||||||||||
1931 | 49.56 | 54.41 | 58.87 | 67.73 | 75.95 | 84.35 | 93.05 | 87.27 | 81.57 | 69.37 | 55.30 | 46.90 | 68.70 | |||||||||||||
1932 | 43.63 | 52.93 | 56.98 | 63.75 | 72.44 | 82.20 | 90.00 | 90.03 | 85.60 | 69.76 | 62.02 | 47.73 | 68.09 | |||||||||||||
1933 | 46.68 | 46.66 | 58.39 | 61.90 | 68.35 | 84.98 | 93.92 | 90.48 | 85.57 | 75.98 | 62.17 | 52.53 | 68.97 | |||||||||||||
1934 | 52.00 | 58.38 | 67.44 | 72.57 | 80.87 | 80.77 | 93.21 | 89.81 | 82.48 | 72.82 | 60.83 | 54.08 | 72.10 | |||||||||||||
1935 | 51.48 | 54.91 | 53.82 | 64.73 | 69.29 | 85.55 | 89.03 | 87.40 | 81.93 | 69.66 | 55.52 | 52.16 | 67.96 | |||||||||||||
1936 | 50.55 | a | 52.10 | 61.32 | 69.30 | 78.95 | 87.68 | 91.45 | 89.35 | 81.42 | 71.00 | 59.87 | 51.03 | 70.34 | ||||||||||||
1937 | 39.61 | 50.93 | 56.47 | 64.47 | 76.08 | 83.43 | 91.55 | 91.98 | 86.22 | 73.84 | 60.90 | 55.48 | 69.25 | |||||||||||||
1938 | 53.00 | a | 53.68 | 56.29 | 66.68 | 74.13 | 84.23 | 89.24 | 88.85 | 85.35 | 70.82 | 54.05 | 54.71 | 69.25 | ||||||||||||
1939 | 49.77 | a | 45.55 | 59.48 | 69.20 | 76.73 | 84.38 | 92.15 | 89.11 | 80.75 | 68.98 | 62.12 | 55.60 | 69.48 | ||||||||||||
1940 | 52.31 | 53.79 | 62.66 | 68.02 | 80.18 | 88.45 | 90.35 | 90.00 | 82.72 | 70.95 | a | 54.95 | 53.69 | 70.67 | ||||||||||||
1941 | 51.15 | 55.93 | a | 56.13 | 58.88 | 73.45 | 80.18 | 88.69 | 85.87 | a | 78.73 | 66.48 | 60.13 | 51.77 | 67.28 | |||||||||||
1942 | 51.55 | 49.48 | 54.35 | 64.28 | 72.05 | 82.40 | 92.08 | a | 87.50 | a | 82.88 | a | 70.84 | 61.75 | 54.53 | a | 68.64 | |||||||||
1943 | 51.23 | 56.23 | b | 61.54 | d | 68.69 | a | 77.50 | b | 81.95 | b | 90.55 | a | 86.43 | a | 84.63 | 70.89 | 59.62 | 51.40 | a | 70.05 | |||||
1944 | 49.65 | a | 50.12 | 54.55 | b | 61.62 | b | 73.56 | 79.41 | a | 88.90 | a | 90.40 | 82.88 | b | 73.92 | 57.50 | a | 52.34 | c | 67.91 | |||||
1945 | 49.57 | a | 53.37 | a | 54.48 | a | 62.55 | 71.14 | f | 78.36 | a | 90.50 | 88.56 | 83.87 | 72.92 | 56.72 | 47.90 | 67.16 | a | |||||||
1946 | 48.32 | 50.23 | 58.39 | 71.05 | a | 74.55 | 86.10 | 89.48 | a | 89.92 | 83.50 | 65.58 | a | 53.80 | b | 54.21 | b | 68.76 | ||||||||
1947 | 46.90 | 58.07 | a | 60.45 | 67.50 | 78.08 | 84.80 | o | 92.15 | 87.68 | 86.67 | 71.81 | 54.02 | a | 48.34 | 68.33 | a | |||||||||
1948 | 51.21 | 51.88 | i | 53.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.54 | j | ||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.00 | v | ----- | z |
1962 | 50.58 | k | 54.70 | 53.83 | a | 72.59 | a | 73.45 | 83.63 | 90.68 | 92.27 | 84.68 | 73.66 | 63.02 | a | 55.38 | a | 72.54 | a | |||||||
1963 | 48.29 | 60.26 | a | 59.24 | 64.07 | a | 78.73 | 81.50 | a | 92.53 | b | 87.32 | 84.57 | w | 74.38 | a | 59.73 | 51.44 | 68.86 | a | ||||||
1964 | 46.02 | 49.91 | 55.13 | 65.67 | 73.87 | 83.28 | 92.33 | a | 86.77 | 81.34 | b | 75.00 | 55.15 | 50.48 | 67.91 | |||||||||||
1965 | 52.42 | 53.00 | 55.21 | 63.23 | 71.42 | 77.80 | 90.82 | 89.15 | a | 78.85 | 74.10 | 61.43 | 51.05 | a | 68.21 | |||||||||||
1966 | 47.77 | 48.15 | b | 59.48 | d | 68.32 | 78.85 | 84.52 | h | 91.74 | 90.35 | 83.25 | 71.30 | a | 60.62 | ----- | z | 69.98 | b | |||||||
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | 59.48 | 65.93 | a | 81.13 | 87.18 | 89.34 | 89.87 | a | 86.37 | 74.63 | 62.65 | 49.16 | 74.57 | b | ||||||||
2002 | 51.45 | 56.25 | 58.60 | 70.02 | 75.42 | 87.58 | 91.44 | 89.70 | a | 83.53 | 69.13 | 61.71 | a | 50.47 | 70.44 | |||||||||||
2003 | 58.97 | 54.61 | 59.05 | a | 61.97 | 76.18 | 84.43 | h | 92.85 | a | 89.28 | a | 84.57 | 77.31 | 56.69 | a | 52.08 | 69.41 | a | |||||||
2004 | 52.32 | 50.76 | 67.50 | a | 66.92 | 76.58 | 84.07 | 89.55 | 88.19 | 82.59 | a | 68.32 | c | 55.50 | 50.98 | 69.44 | ||||||||||
2005 | 52.26 | 53.43 | 56.05 | 64.25 | 75.68 | 82.75 | 91.10 | 87.97 | 83.08 | 72.26 | 62.00 | 53.66 | 69.54 | |||||||||||||
2006 | 52.97 | a | 56.62 | 56.34 | 66.65 | 78.77 | 89.05 | 93.68 | 88.84 | 77.70 | 68.68 | 61.70 | 50.81 | 70.15 | ||||||||||||
2007 | 48.95 | 54.93 | 62.79 | 66.30 | 75.39 | 83.92 | 90.58 | 90.73 | 82.80 | 70.69 | 63.88 | 47.08 | 69.84 | |||||||||||||
2008 | 47.35 | 51.33 | 59.03 | 67.15 | 72.98 | a | 87.05 | 89.56 | 90.23 | 84.37 | 71.76 | 61.58 | 50.35 | 69.40 | ||||||||||||
2009 | 53.34 | 54.21 | 61.47 | 65.32 | 81.32 | 83.28 | 94.06 | 90.66 | 85.47 | 68.89 | 63.08 | 49.50 | 70.88 | |||||||||||||
2010 | 52.73 | 53.36 | 56.02 | 62.63 | 71.56 | 84.13 | 91.81 | 88.89 | 86.73 | 72.48 | 57.48 | 55.68 | 69.46 | |||||||||||||
2011 | 51.66 | 49.64 | 62.24 | 68.20 | 72.61 | 84.50 | 91.00 | 93.97 | 86.38 | 74.29 | 58.10 | 49.16 | 70.15 | |||||||||||||
2012 | 54.65 | 54.78 | 60.39 | 69.87 | 78.61 | 87.30 | 89.06 | 91.06 | 84.12 | 73.65 | 64.25 | 51.52 | 71.60 | |||||||||||||
2013 | 49.50 | 51.91 | 63.66 | 69.20 | 77.47 | 89.53 | 92.21 | 89.85 | 82.62 | 68.73 | 62.13 | 51.29 | 70.68 | |||||||||||||
2014 | 55.90 | 59.05 | 63.87 | 69.28 | 77.69 | 87.17 | 92.35 | 86.23 | 83.17 | 74.26 | 60.87 | 53.18 | 71.92 | |||||||||||||
2015 | 54.98 | 60.79 | 66.65 | 67.53 | 72.15 | 88.42 | 88.92 | 92.08 | 85.28 | 73.52 | 56.33 | 49.42 | 71.34 | |||||||||||||
2016 | 50.81 | 59.67 | 63.53 | 68.43 | 73.56 | 89.87 | 93.31 | 88.66 | 81.85 | 75.60 | 62.55 | 54.13 | 71.83 | |||||||||||||
2017 | 50.44 | 56.78 | a | 63.31 | 68.58 | 75.00 | 88.23 | 91.29 | 89.73 | 81.70 | 75.27 | 67.10 | 55.92 | 71.95 | ||||||||||||
2018 | 56.68 | 54.66 | 60.85 | 71.58 | 76.55 | 86.08 | 91.79 | 89.95 | 86.77 | 68.73 | 58.00 | 51.68 | 71.11 | |||||||||||||
2019 | 52.05 | 48.91 | a | 59.31 | 68.68 | 69.97 | 84.65 | 91.42 | 92.39 | 83.18 | 69.06 | 61.03 | 51.31 | 69.33 | ||||||||||||
2020 | 52.39 | 53.60 | 58.11 | 65.39 | c | 84.89 | 88.88 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.88 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 50.73 | 53.71 | 59.18 | 66.73 | 75.50 | 84.60 | 91.18 | 89.35 | 83.34 | 71.65 | 59.66 | 51.69 | 69.74 | |||||||||||||
S.D. | 3.41 | 3.60 | 3.66 | 3.11 | 3.65 | 3.03 | 1.51 | 1.77 | 2.25 | 2.76 | 3.24 | 2.47 | 1.33 | |||||||||||||
SKEW | -0.59 | -0.09 | 0.47 | -0.28 | 0.16 | -0.27 | 0.06 | 0.20 | -0.46 | -0.09 | -0.20 | -0.04 | 0.15 | |||||||||||||
MAX | 58.97 | 60.79 | 67.50 | 72.59 | 84.89 | 89.87 | 94.06 | 93.97 | 86.77 | 77.31 | 67.10 | 55.92 | 72.10 | |||||||||||||
MIN | 39.61 | 45.55 | 53.82 | 58.88 | 68.35 | 77.80 | 88.69 | 85.87 | 77.70 | 65.58 | 53.80 | 46.90 | 67.28 | |||||||||||||
YRS | 42 | 42 | 44 | 43 | 42 | 39 | 42 | 42 | 41 | 42 | 42 | 41 | 35 |