YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 17.27 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.67 | 40.26 | 28.17 | 22.10 | 34.05 | h | ||||
1966 | 7.58 | 11.89 | 22.74 | 28.63 | 38.32 | 51.53 | 59.81 | 55.65 | 50.10 | 38.71 | 26.50 | 17.10 | 34.05 | |||||||||||||
1967 | 13.06 | 3.00 | 16.71 | 29.63 | 34.39 | 48.73 | 54.58 | 54.16 | 49.17 | 38.87 | 25.97 | 18.68 | 32.25 | |||||||||||||
1968 | 8.23 | 6.66 | 23.74 | 32.83 | 36.77 | 48.53 | 56.42 | 54.48 | 50.97 | 42.93 | a | 28.10 | a | 18.13 | 33.98 | |||||||||||
1969 | 13.97 | 10.43 | 12.32 | 30.50 | 39.65 | 46.07 | 54.77 | 59.39 | 50.80 | 37.71 | 27.07 | 19.29 | 33.50 | |||||||||||||
1970 | 5.16 | 5.75 | 14.84 | 29.93 | 38.29 | 49.10 | 58.55 | 57.32 | 50.70 | 41.26 | 29.40 | 17.29 | 33.13 | |||||||||||||
1971 | 8.48 | 8.14 | 16.29 | 29.70 | 36.17 | b | 50.33 | 53.07 | c | 52.85 | d | 52.96 | d | 47.10 | 29.47 | 17.86 | b | 33.54 | ||||||||
1972 | 5.19 | 4.45 | 11.29 | 23.03 | 39.10 | 47.93 | 53.77 | 53.65 | e | 45.46 | b | 35.81 | d | 27.21 | f | 8.00 | k | 31.97 | b | |||||||
1973 | 13.40 | a | 10.55 | h | 26.90 | 31.40 | 36.96 | c | 51.89 | c | 58.72 | m | 60.47 | l | 50.10 | i | 44.41 | i | 30.05 | h | 15.44 | o | 32.11 | g | ||
1974 | 4.67 | s | 1.46 | o | 16.93 | b | 24.58 | k | 30.78 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.15 | d | 22.74 | 23.28 | i | |
1975 | 14.59 | b | 14.36 | 17.61 | 25.20 | 43.04 | c | 49.32 | b | 55.75 | g | 55.39 | 45.23 | 40.61 | h | 31.27 | 16.10 | 31.21 | b | |||||||
1976 | 8.35 | 16.62 | 20.68 | 33.60 | 37.74 | 51.00 | 55.45 | 55.65 | 46.10 | 34.45 | 22.77 | 7.77 | 32.52 | |||||||||||||
1977 | 0.74 | 11.82 | 25.03 | 30.73 | 43.90 | a | 48.13 | 55.45 | 51.29 | 48.10 | 37.90 | 26.90 | 16.84 | 33.07 | ||||||||||||
1978 | 10.45 | b | 10.39 | 16.84 | 28.33 | 39.74 | 48.60 | 55.13 | 57.16 | 49.40 | 37.68 | 24.77 | 9.74 | 32.35 | ||||||||||||
1979 | 3.23 | -1.36 | 17.33 | a | 25.50 | 35.84 | 47.03 | a | 52.55 | 51.03 | 46.67 | 34.84 | 25.30 | 20.32 | 29.86 | |||||||||||
1980 | 8.94 | m | 7.55 | 13.71 | 29.80 | 40.83 | a | 45.87 | 54.93 | a | 55.84 | 45.07 | a | 33.10 | 26.67 | 10.94 | 33.12 | a | ||||||||
1981 | 9.00 | 12.18 | 18.41 | d | 29.95 | h | 33.97 | 50.03 | 54.06 | 53.72 | b | 43.55 | a | 34.53 | a | 28.81 | c | 16.87 | 32.29 | a | ||||||
1982 | -0.17 | a | 4.39 | 17.23 | 21.18 | b | 41.61 | 43.57 | 54.71 | 50.68 | 46.55 | a | 38.19 | 19.80 | t | 19.31 | b | 30.66 | a | |||||||
1983 | 14.32 | 17.41 | a | 21.97 | 26.90 | 33.84 | 49.33 | 58.71 | 57.45 | 49.57 | 37.42 | 28.47 | o | 5.90 | 33.89 | a | ||||||||||
1984 | 4.60 | a | 20.07 | 11.52 | 33.93 | p | 37.94 | 50.80 | 53.13 | 56.50 | a | 43.77 | 37.94 | 26.82 | h | 13.52 | 32.98 | b | ||||||||
1985 | 7.52 | 4.61 | 22.32 | 37.31 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.43 | q | 26.15 | c | 9.27 | e | 13.97 | g | |||
1986 | 11.93 | b | 8.92 | b | 19.71 | 35.30 | 44.61 | 49.79 | b | 56.61 | 53.26 | 47.26 | c | 36.06 | 21.78 | g | 18.77 | 34.75 | a | |||||||
1987 | 16.55 | 18.09 | e | 23.35 | 32.80 | 42.56 | d | 51.54 | b | 57.44 | d | 54.00 | c | 48.00 | c | 34.11 | c | 29.12 | f | 19.00 | m | 37.84 | b | |||
1988 | 8.29 | 5.77 | c | 18.35 | 28.76 | a | 38.23 | a | 51.23 | 57.39 | 55.32 | f | 47.08 | d | 35.50 | c | 29.38 | f | 14.54 | e | 30.51 | b | ||||
1989 | 16.29 | 4.58 | d | ----- | z | 26.52 | c | 37.93 | a | 47.41 | a | 56.00 | 54.85 | d | 46.80 | 37.32 | c | 22.20 | e | 6.87 | a | 32.43 | a | |||
1990 | 18.43 | c | ----- | z | 19.39 | 30.26 | c | 34.45 | 47.40 | 52.97 | 52.28 | f | 44.72 | a | 33.47 | a | 28.56 | e | 12.87 | a | 32.25 | b | ||||
1991 | 6.52 | 12.25 | 18.26 | 31.60 | 39.63 | a | 47.93 | c | 53.29 | c | 54.30 | d | 42.31 | a | 34.54 | c | 23.44 | e | 16.69 | b | 31.73 | |||||
1992 | 14.52 | 15.93 | b | 17.43 | a | 28.83 | 41.63 | d | 45.92 | e | 48.14 | i | 48.36 | f | 44.48 | c | 35.18 | c | 23.11 | k | 15.10 | j | 30.49 | d | ||
1993 | 7.50 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.09 | s | 18.33 | a | 18.33 | k |
1994 | -2.00 | g | -1.29 | g | 20.97 | b | 28.29 | f | 38.65 | k | 48.92 | d | 53.46 | e | 52.78 | d | 49.17 | f | 38.50 | g | 29.87 | g | 20.16 | l | 44.03 | h |
1995 | 15.70 | u | 10.68 | c | 15.71 | q | 30.00 | r | 39.88 | e | 52.33 | f | 54.93 | c | 58.89 | d | 44.64 | b | ----- | z | 18.92 | e | 11.96 | d | 34.27 | e |
1996 | 6.93 | d | 2.36 | r | 12.32 | l | 23.29 | b | 33.07 | b | 47.46 | b | ----- | z | ----- | z | 49.74 | g | 36.13 | 23.35 | d | 14.26 | d | 26.35 | e | |
1997 | 7.97 | 9.59 | f | 14.74 | l | 22.20 | o | 33.39 | c | 48.10 | i | 49.82 | n | 50.62 | j | 47.82 | s | 37.23 | e | 24.70 | c | 21.76 | f | 25.82 | h | |
1998 | 14.42 | 24.21 | i | 17.04 | e | 28.75 | j | 39.83 | a | 48.75 | b | 54.65 | k | 55.00 | i | 49.86 | h | 33.64 | t | 28.65 | m | 14.91 | i | 30.01 | h | |
1999 | 7.25 | g | 13.77 | o | 18.68 | c | 27.10 | j | 40.15 | k | 49.08 | r | 54.14 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.68 | k |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.11 | b | 55.24 | f | 56.92 | g | 49.52 | a | 38.04 | d | 26.74 | c | 21.18 | i | 40.10 | h |
2004 | 6.13 | a | 13.18 | a | 22.82 | c | 29.05 | i | 37.65 | e | 46.62 | d | 51.17 | a | 49.32 | f | 54.32 | k | 38.27 | e | 28.57 | b | 13.08 | f | 30.55 | d |
2005 | 10.00 | b | 16.64 | c | 16.46 | c | 32.41 | c | 39.79 | g | 52.81 | c | 54.88 | o | 55.93 | c | 50.75 | b | 40.48 | j | 29.10 | t | 13.00 | v | 33.57 | e |
2006 | 22.91 | t | 13.50 | l | 21.87 | p | 28.20 | y | 44.08 | g | 49.41 | m | 56.95 | j | 54.84 | 44.89 | b | 32.94 | ----- | z | 27.53 | p | 44.22 | i | ||
2007 | 15.70 | a | 7.85 | b | 25.74 | h | 27.32 | h | 46.11 | l | 49.50 | p | 56.87 | h | 58.83 | y | 48.86 | i | 41.37 | d | 24.31 | q | 19.67 | s | 21.64 | i |
2008 | 11.26 | l | 8.50 | y | 12.42 | l | 32.17 | r | 36.54 | r | 50.70 | 55.20 | a | 53.68 | 49.47 | 38.71 | 29.20 | 10.87 | 41.12 | e | ||||||
2009 | 4.45 | 10.11 | 16.94 | 28.20 | 38.45 | 47.43 | 51.45 | 54.58 | 51.43 | 34.68 | 33.13 | 15.77 | 32.22 | |||||||||||||
2010 | 15.77 | 15.64 | 24.29 | 33.77 | 44.29 | 51.17 | 59.55 | 59.71 | 44.07 | 40.00 | 27.67 | 17.87 | 36.15 | |||||||||||||
2011 | 11.42 | 11.96 | 18.77 | 29.83 | 38.94 | 47.07 | 59.19 | 56.81 | 46.83 | 40.87 | 29.57 | 19.71 | 34.25 | |||||||||||||
2012 | 15.90 | 20.24 | 31.77 | ----- | z | 44.61 | 54.17 | 59.84 | 55.58 | 45.30 | 37.19 | 28.30 | 23.35 | 37.84 | a | |||||||||||
2013 | 13.29 | 11.07 | 18.23 | 27.03 | 36.68 | 46.60 | 53.97 | 56.42 | 47.93 | 39.52 | 25.50 | 9.58 | 32.15 | |||||||||||||
2014 | 1.00 | 1.64 | 7.06 | 25.63 | 39.84 | 48.13 | 55.35 | 52.26 | 48.47 | 37.71 | 21.03 | 18.45 | 29.72 | |||||||||||||
2015 | 6.97 | -0.21 | 16.87 | 30.33 | 43.21 | b | 47.13 | 57.23 | 56.55 | k | 53.73 | 37.13 | 31.30 | 27.13 | 31.89 | a | ||||||||||
2016 | 14.26 | 17.03 | 22.35 | 26.80 | 39.16 | 49.73 | 57.23 | 58.45 | 51.97 | 41.29 | 34.07 | 16.87 | 35.77 | |||||||||||||
2017 | 15.81 | 18.18 | 19.55 | 30.63 | 37.97 | 51.13 | 54.45 | 51.81 | 51.30 | 41.65 | 25.10 | 11.81 | 34.11 | |||||||||||||
2018 | 12.06 | 7.68 | 16.10 | 22.67 | 41.90 | 48.20 | 57.10 | 55.81 | 49.73 | 34.26 | 22.23 | 21.52 | 32.44 | |||||||||||||
2019 | 7.74 | 6.11 | 15.10 | 28.87 | 36.61 | 45.73 | 57.87 | 52.58 | 51.47 | 37.19 | 23.37 | 18.03 | 31.72 | |||||||||||||
2020 | 17.68 | 13.76 | 21.61 | 25.93 | 39.61 | 51.90 | 60.13 | 57.35 | 46.97 | 33.61 | 30.20 | 20.84 | 34.97 | |||||||||||||
2021 | 18.19 | 6.61 | 23.35 | 32.23 | 40.71 | 53.30 | 53.74 | 59.61 | 47.77 | 45.29 | 28.43 | 20.32 | 35.80 | |||||||||||||
2022 | 5.97 | 4.86 | 17.00 | 28.30 | 42.52 | 50.70 | 55.42 | 55.06 | 48.37 | 39.13 | 30.33 | 17.00 | 32.89 | |||||||||||||
2023 | 18.87 | 13.82 | 18.74 | 30.47 | 40.94 | 50.03 | 53.39 | 52.03 | 51.37 | 42.19 | 27.23 | 27.90 | 35.58 | |||||||||||||
2024 | 18.03 | 19.48 | 23.19 | 24.29 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.24 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 10.61 | 10.46 | 18.89 | 28.91 | 39.03 | 49.00 | 55.60 | 55.07 | 47.92 | 37.81 | 27.02 | 16.54 | 33.24 | |||||||||||||
S.D. | 5.13 | 5.61 | 4.35 | 3.25 | 3.08 | 2.26 | 2.35 | 2.39 | 2.81 | 3.17 | 3.28 | 5.00 | 1.70 | |||||||||||||
SKEW | -0.20 | -0.06 | 0.14 | -0.41 | -0.05 | 0.08 | 0.30 | 0.16 | 0.06 | 0.71 | -0.23 | -0.13 | -0.14 | |||||||||||||
MAX | 18.87 | 20.24 | 31.77 | 35.30 | 44.61 | 54.17 | 60.13 | 59.71 | 53.73 | 47.10 | 34.07 | 27.90 | 36.15 | |||||||||||||
MIN | -0.17 | -1.36 | 7.06 | 21.18 | 33.07 | 43.57 | 51.17 | 50.68 | 42.31 | 32.94 | 18.92 | 5.90 | 29.72 | |||||||||||||
YRS | 47 | 44 | 47 | 39 | 45 | 47 | 41 | 40 | 45 | 46 | 40 | 43 | 24 |