YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.33 | 40.52 | 28.37 | 23.10 | 36.58 | h | ||||
1940 | 4.00 | 17.71 | a | 19.33 | a | 35.70 | 47.55 | 60.97 | 65.52 | 61.58 | 55.72 | a | 45.29 | 25.43 | 19.37 | a | 38.18 | |||||||||
1941 | 14.13 | a | 9.86 | 21.40 | a | 44.20 | 55.61 | 61.62 | a | 64.58 | 63.52 | 56.31 | a | 45.06 | 31.37 | 23.10 | 40.90 | |||||||||
1942 | 13.19 | 14.36 | 29.74 | 43.40 | 48.90 | 60.17 | 62.97 | 62.65 | 51.90 | 40.65 | 28.04 | b | 11.63 | a | 38.97 | |||||||||||
1943 | 2.23 | 9.82 | 16.65 | 35.57 | 47.39 | 62.80 | 65.13 | 63.17 | a | 49.87 | 39.90 | a | 25.21 | a | 17.03 | a | 36.23 | |||||||||
1944 | 17.48 | b | 14.75 | a | 20.93 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.72 | i |
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 | 67.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.68 | k | |
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 | 39.93 | p | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | 48.03 | 60.73 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.38 | j | ||
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.17 | ----- | z | 29.47 | 16.74 | 33.79 | i | |||
1970 | ----- | z | ----- | z | 22.65 | ----- | z | 53.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.03 | ----- | z | 35.56 | i | |||
1971 | ----- | z | ----- | z | 21.16 | ----- | z | ----- | z | 65.07 | 60.68 | 60.29 | 57.07 | 50.55 | 31.79 | a | 19.10 | a | 45.71 | d | ||||||
1972 | ----- | z | 7.31 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 7.31 | k | |
1973 | ----- | z | 16.86 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 14.23 | 15.54 | j | ||
1974 | 11.21 | b | ----- | z | ----- | z | ----- | z | ----- | z | 57.13 | ----- | z | ----- | z | 49.73 | 44.23 | a | ----- | z | 22.10 | 36.88 | g | |||
1975 | 9.73 | a | ----- | z | 16.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 13.30 | j | |
1976 | ----- | z | ----- | z | ----- | z | 42.03 | ----- | z | 60.40 | 64.71 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.71 | i | |||
1977 | ----- | z | 13.54 | 32.52 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.03 | ----- | z | ----- | z | ----- | z | 34.03 | i | |||
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 | 37.50 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.50 | k | |
1981 | ----- | z | ----- | z | 27.35 | 41.77 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.56 | j | ||
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 | 63.20 | 62.94 | 62.45 | 51.03 | 38.68 | 19.33 | 14.74 | 44.62 | e | |||||||
1992 | 16.06 | 22.17 | 23.90 | 35.73 | 47.96 | c | 54.71 | b | 58.03 | a | 56.68 | 50.67 | c | 38.87 | a | 28.59 | a | 15.69 | b | 37.42 | ||||||
1993 | 2.54 | e | 7.20 | c | 16.11 | c | 30.56 | c | 47.79 | b | 52.36 | b | 61.54 | c | 61.34 | b | 46.07 | b | 37.43 | a | 26.38 | a | 16.97 | b | 33.86 | |
1994 | -6.54 | c | 0.92 | c | 22.27 | e | 35.75 | b | 45.93 | c | 59.47 | 60.15 | d | 57.22 | d | 55.07 | b | 45.15 | d | 31.64 | b | 20.28 | b | 35.61 | ||
1995 | 9.22 | d | 10.52 | a | 24.71 | c | 33.32 | b | 45.39 | c | 59.15 | c | 62.00 | d | 68.00 | b | 49.92 | f | 42.07 | b | 21.69 | a | 10.89 | d | 35.18 | a |
1996 | -0.33 | a | 11.42 | c | 14.10 | a | 30.93 | b | 45.79 | b | 57.93 | b | 59.80 | a | 59.93 | a | 53.76 | a | 40.11 | c | 20.07 | 9.90 | a | 33.62 | ||
1997 | 2.47 | a | 11.64 | 22.10 | 33.79 | b | 42.39 | c | 57.68 | b | 61.54 | e | 58.61 | c | 53.68 | e | 40.76 | b | 24.37 | c | 22.45 | 35.96 | ||||
1998 | 16.00 | e | 25.89 | 25.87 | 40.00 | 51.32 | 55.83 | a | 62.13 | 62.10 | b | 55.48 | a | 43.89 | d | 31.50 | 20.70 | a | 40.89 | |||||||
1999 | 3.87 | a | 20.96 | b | 24.26 | 41.47 | 50.10 | a | 57.54 | b | 65.13 | a | 60.40 | a | 50.82 | b | 38.87 | 33.42 | d | 18.14 | b | 38.75 | ||||
2000 | 6.00 | a | 19.00 | f | 31.38 | b | 35.04 | c | 50.52 | 56.12 | d | 62.35 | 62.03 | b | 54.28 | l | 42.67 | a | 27.60 | -0.40 | a | 37.33 | b | |||
2001 | 11.39 | 6.20 | c | 19.48 | 38.53 | 49.81 | 57.50 | 61.20 | a | 62.39 | c | 50.97 | 39.29 | 38.63 | c | 22.58 | 38.16 | |||||||||
2002 | 18.00 | 20.57 | 17.70 | a | 35.97 | 43.31 | b | 58.60 | 65.23 | a | 62.00 | a | 55.69 | d | 37.43 | a | 26.47 | 18.84 | 38.32 | |||||||
2003 | 7.58 | 5.54 | 21.87 | 35.97 | 45.58 | 55.53 | 61.60 | a | 62.10 | 50.38 | a | 40.06 | 27.14 | a | 19.45 | 36.07 | ||||||||||
2004 | 5.60 | a | 11.41 | 29.13 | a | 36.77 | 44.67 | a | 54.73 | 60.68 | 55.48 | 56.21 | b | 41.89 | c | 31.96 | b | 14.55 | 36.92 | |||||||
2005 | 7.39 | 19.89 | 21.32 | 39.28 | a | 45.90 | 61.57 | 62.42 | 60.74 | 55.97 | 44.13 | 29.63 | 12.58 | 38.40 | ||||||||||||
2006 | 23.74 | 11.11 | 24.61 | 41.87 | 48.81 | 58.27 | 65.26 | 62.81 | 50.43 | 36.71 | 30.83 | 21.68 | 39.68 | |||||||||||||
2007 | 13.26 | 3.71 | 26.32 | 35.23 | 50.39 | 58.80 | 60.58 | 61.00 | 52.17 | 46.94 | 27.30 | 10.26 | 37.16 | |||||||||||||
2008 | 4.87 | 0.24 | 17.68 | 35.07 | 44.55 | 57.30 | 60.06 | 58.52 | 53.07 | a | 39.48 | 27.70 | 1.80 | a | 33.36 | |||||||||||
2009 | -5.76 | b | 12.39 | 24.10 | a | 36.00 | 47.29 | 55.90 | 57.42 | 58.45 | 54.50 | 37.32 | 34.10 | a | 13.32 | 35.42 | ||||||||||
2010 | 5.58 | 6.11 | 27.97 | 41.87 | 48.58 | 59.03 | 64.26 | 65.77 | 50.77 | 42.42 | 29.47 | 7.90 | 37.48 | |||||||||||||
2011 | 3.29 | 9.39 | 21.32 | 36.50 | 47.16 | 58.20 | 67.20 | a | 62.39 | 51.47 | 43.48 | 32.13 | 19.87 | 37.70 | ||||||||||||
2012 | 13.87 | 20.59 | 39.29 | 38.63 | 51.19 | 59.60 | 67.55 | 58.74 | 49.03 | 38.23 | 29.03 | 18.48 | 40.35 | |||||||||||||
2013 | 8.58 | 9.07 | 15.35 | 31.87 | 46.90 | 58.17 | 63.19 | 61.39 | 54.66 | a | 39.74 | 24.87 | 6.61 | 35.03 | ||||||||||||
2014 | -3.68 | -5.36 | 14.10 | 33.57 | 47.52 | 60.60 | 60.71 | 62.77 | 52.73 | 40.19 | 21.37 | 19.42 | 33.66 | |||||||||||||
2015 | 8.28 | b | -3.56 | a | 21.90 | 37.67 | 49.84 | 58.97 | 62.23 | 61.29 | 59.83 | 42.87 | 34.83 | 27.65 | 38.48 | |||||||||||
2016 | 6.90 | 14.48 | 31.39 | 38.41 | a | 47.90 | 59.70 | 64.81 | 64.48 | 58.00 | 45.10 | 36.47 | 12.74 | 40.03 | ||||||||||||
2017 | 12.84 | 19.18 | 24.57 | a | 40.93 | 47.94 | 57.93 | 63.32 | 59.71 | 56.67 | 45.03 | 25.97 | 12.35 | 38.87 | ||||||||||||
2018 | 5.90 | 5.54 | 23.71 | 26.93 | 54.65 | 62.07 | 64.03 | 62.97 | 57.23 | 39.48 | 24.80 | 21.42 | 37.39 | |||||||||||||
2019 | 7.00 | 0.96 | 16.97 | 36.72 | a | 46.94 | 57.70 | 65.45 | 60.90 | 57.97 | 40.94 | 25.53 | 16.97 | 36.17 | ||||||||||||
2020 | 14.73 | a | 8.64 | a | 30.39 | 35.13 | 48.68 | 59.73 | 65.42 | 61.43 | a | 52.07 | 36.93 | a | 31.87 | 19.48 | 38.71 | |||||||||
2021 | 16.32 | 2.61 | 30.97 | a | 37.87 | 47.97 | a | 61.86 | a | 63.00 | a | 62.27 | a | 54.90 | 49.07 | a | 30.03 | 19.10 | 39.66 | |||||||
2022 | -1.00 | 5.61 | 25.23 | 33.21 | a | 50.43 | a | 59.50 | 63.55 | 62.06 | 55.30 | 40.42 | 28.79 | a | 13.70 | a | 36.40 | |||||||||
2023 | 17.10 | 12.93 | 24.16 | 38.73 | 50.73 | a | 59.59 | a | 60.55 | 62.55 | 57.90 | 45.94 | 29.23 | 28.29 | 40.64 | |||||||||||
2024 | 18.26 | 24.72 | 28.26 | 38.63 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.75 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.53 | 10.92 | 23.51 | 36.91 | 48.27 | 58.87 | 62.91 | 61.37 | 53.77 | 41.69 | 28.62 | 16.54 | 37.48 | |||||||||||||
S.D. | 6.99 | 7.50 | 5.51 | 3.73 | 2.81 | 2.52 | 2.44 | 2.38 | 3.02 | 3.34 | 4.18 | 6.04 | 2.14 | |||||||||||||
SKEW | -0.16 | -0.01 | 0.43 | -0.21 | 0.44 | -0.07 | -0.05 | -0.07 | -0.27 | 0.64 | -0.08 | -0.68 | -0.28 | |||||||||||||
MAX | 23.74 | 25.89 | 39.29 | 44.20 | 55.61 | 65.07 | 67.68 | 68.00 | 59.83 | 50.55 | 38.63 | 28.29 | 40.90 | |||||||||||||
MIN | -6.54 | -5.36 | 14.10 | 26.93 | 42.39 | 52.36 | 57.42 | 55.48 | 46.07 | 36.71 | 19.33 | -0.40 | 33.36 | |||||||||||||
YRS | 40 | 40 | 43 | 39 | 38 | 41 | 40 | 38 | 40 | 40 | 41 | 42 | 34 |