YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | 15.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 15.68 | k | |
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 | 17.00 | a | 24.00 | a | 24.52 | 34.76 | a | 48.72 | b | 54.50 | 57.13 | 57.90 | a | 49.62 | a | 39.77 | 30.37 | 16.41 | b | 37.89 | ||||||
1999 | 5.48 | 20.68 | 23.90 | a | 34.93 | a | 47.50 | a | 55.80 | 61.81 | 53.52 | 43.87 | 33.97 | 28.93 | a | 17.45 | 35.65 | |||||||||
2000 | 6.83 | a | 15.32 | a | 28.97 | 31.41 | a | 47.48 | 55.72 | a | 57.29 | 57.39 | 47.60 | 41.03 | a | 27.47 | 2.65 | 34.93 | ||||||||
2001 | 12.94 | 8.61 | 21.17 | a | 38.03 | a | 46.71 | 56.27 | 59.04 | e | 58.97 | 46.37 | 37.20 | a | 33.67 | 21.68 | 36.72 | |||||||||
2002 | 17.94 | 18.00 | 18.42 | 35.53 | 40.26 | 57.23 | 61.87 | 56.13 | 50.67 | 33.48 | 24.10 | 17.87 | 35.96 | |||||||||||||
2003 | 6.19 | 3.00 | a | 20.73 | a | 29.93 | b | 41.43 | a | 52.00 | 57.52 | 57.52 | 48.23 | 35.10 | 27.73 | 19.84 | 33.27 | |||||||||
2004 | 2.23 | 13.54 | c | 27.81 | 32.70 | 43.39 | 53.07 | 56.39 | 51.17 | a | 50.20 | 38.10 | 29.50 | 14.19 | 34.36 | |||||||||||
2005 | 8.13 | 17.25 | 17.13 | 33.77 | 42.39 | 58.27 | 57.90 | 56.74 | 50.53 | 40.35 | 26.47 | 12.45 | 35.12 | |||||||||||||
2006 | 23.84 | 10.46 | 22.19 | 36.70 | 46.87 | 52.57 | 59.87 | 56.20 | a | 46.00 | 34.87 | 31.47 | 22.23 | 36.94 | ||||||||||||
2007 | 15.29 | 4.93 | 24.61 | 33.00 | 46.71 | 55.13 | 54.48 | 57.30 | a | 49.40 | 43.55 | 24.67 | 11.48 | 35.05 | ||||||||||||
2008 | 9.81 | 3.59 | 16.45 | 34.83 | 39.32 | 55.04 | b | 58.55 | 53.77 | 50.33 | 37.29 | 25.70 | 4.87 | 32.46 | ||||||||||||
2009 | -0.81 | 11.82 | 19.42 | 32.13 | 45.29 | 53.73 | 52.48 | 54.19 | 47.20 | 36.13 | 31.83 | 13.68 | 33.09 | |||||||||||||
2010 | 11.39 | 12.18 | 23.97 | 37.57 | 46.67 | a | 56.50 | 61.90 | 61.10 | 47.33 | 37.19 | 28.03 | 11.81 | 36.30 | ||||||||||||
2011 | 5.87 | 11.32 | 18.94 | 32.23 | 42.94 | 52.90 | 62.13 | 55.71 | 45.70 | 39.00 | 30.13 | 21.29 | 34.85 | |||||||||||||
2012 | 13.55 | 18.76 | 34.74 | 33.07 | 48.03 | 55.60 | 62.48 | 55.94 | 45.20 | 36.29 | 28.10 | 23.00 | 37.90 | |||||||||||||
2013 | 9.61 | 8.54 | 16.06 | 31.90 | 44.55 | 54.17 | 58.52 | 54.52 | 46.93 | 38.19 | 25.70 | 6.74 | 32.95 | |||||||||||||
2014 | -1.55 | -0.29 | 12.52 | 31.70 | 44.90 | a | 57.03 | 55.03 | 56.19 | 47.10 | 38.77 | a | 21.77 | 19.58 | 31.90 | |||||||||||
2015 | 9.19 | -1.82 | 20.13 | 32.73 | 44.90 | 52.30 | 56.30 | a | 56.48 | 53.73 | 39.74 | 32.20 | 28.97 | 35.41 | ||||||||||||
2016 | 9.65 | 16.03 | 27.58 | 32.17 | 43.39 | 54.70 | 60.45 | 58.94 | 54.07 | 42.03 | 31.80 | 16.23 | 37.25 | |||||||||||||
2017 | 15.03 | 19.64 | 22.26 | 37.37 | 44.03 | 58.57 | 59.94 | 55.16 | 50.43 | 44.16 | 26.43 | 12.97 | 37.17 | |||||||||||||
2018 | 10.55 | 10.82 | 21.42 | 24.80 | 50.29 | 56.27 | 59.29 | 58.58 | 51.27 | 36.90 | 23.50 | 21.90 | 35.47 | |||||||||||||
2019 | 6.61 | 7.07 | 15.32 | 33.37 | 44.65 | 57.60 | 63.94 | 55.03 | 54.30 | 37.97 | 23.80 | 20.19 | 34.99 | |||||||||||||
2020 | 17.32 | 9.34 | 27.39 | 31.43 | 43.77 | 55.33 | 62.97 | 57.26 | 49.53 | 34.45 | 32.40 | 19.77 | 36.75 | |||||||||||||
2021 | 14.42 | 3.75 | 27.16 | 34.67 | 44.65 | 57.63 | 58.55 | 59.52 | 49.87 | 45.81 | 26.33 | 20.45 | 36.90 | |||||||||||||
2022 | 3.97 | 8.32 | 22.19 | 31.83 | 47.06 | 55.03 | 58.81 | 57.68 | 49.90 | 36.55 | 28.30 | 16.65 | 34.69 | |||||||||||||
2023 | 21.26 | 13.86 | 21.87 | 36.07 | 43.39 | 52.13 | 57.26 | 56.65 | 53.13 | 41.29 | 26.17 | 27.03 | 37.51 | |||||||||||||
2024 | 18.71 | 21.24 | 25.18 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.71 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 10.93 | 11.48 | 22.30 | 33.41 | 44.97 | 55.20 | 58.92 | 56.52 | 49.17 | 38.43 | 27.94 | 16.98 | 35.44 | |||||||||||||
S.D. | 6.35 | 6.74 | 4.88 | 2.77 | 2.60 | 1.93 | 2.80 | 2.12 | 2.79 | 3.18 | 3.15 | 6.29 | 1.70 | |||||||||||||
SKEW | -0.04 | -0.10 | 0.29 | -0.78 | -0.17 | -0.08 | -0.21 | -0.26 | 0.15 | 0.54 | 0.02 | -0.45 | -0.42 | |||||||||||||
MAX | 23.84 | 24.00 | 34.74 | 38.03 | 50.29 | 58.57 | 63.94 | 61.10 | 54.30 | 45.81 | 33.67 | 28.97 | 37.90 | |||||||||||||
MIN | -1.55 | -1.82 | 12.52 | 24.80 | 39.32 | 52.00 | 52.48 | 51.17 | 43.87 | 33.48 | 21.77 | 2.65 | 31.90 | |||||||||||||
YRS | 28 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |