YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 27.19 | 35.53 | 42.87 | 39.32 | 34.36 | e | 27.26 | 14.30 | 1.62 | e | 27.81 | d | ||||||
1968 | 0.14 | b | 4.86 | 4.71 | 15.77 | 25.23 | a | 31.77 | 40.19 | 39.97 | 28.40 | 21.48 | 12.07 | 4.08 | e | 19.06 | ||||||||||
1969 | 7.26 | -3.46 | -3.35 | k | 19.47 | 29.00 | 34.17 | 41.68 | 41.48 | 32.80 | 20.35 | 14.70 | 5.19 | 22.06 | a | |||||||||||
1970 | -5.62 | o | 4.12 | l | 4.87 | 10.47 | 23.65 | 32.70 | 40.90 | 41.23 | 31.53 | 22.45 | 17.66 | a | 5.06 | 23.05 | b | |||||||||
1971 | 10.48 | 5.82 | 7.87 | 19.43 | 24.19 | 29.80 | 37.06 | 38.42 | 28.07 | 22.70 | k | 13.03 | 1.23 | 19.58 | a | |||||||||||
1972 | 6.58 | -0.39 | k | 15.90 | 20.52 | a | 24.29 | 31.87 | 37.26 | 37.52 | 32.96 | f | 26.57 | c | 8.47 | 0.83 | a | 20.98 | b | |||||||
1973 | -0.73 | a | -1.50 | 5.68 | 10.83 | 24.20 | a | 30.47 | 37.90 | 35.27 | a | 26.80 | 20.42 | 16.87 | 7.33 | d | 17.79 | |||||||||
1974 | -3.48 | -1.71 | 11.43 | c | 14.00 | 23.35 | 29.50 | 38.68 | 34.84 | 29.63 | 25.06 | 13.53 | 2.67 | a | 18.12 | |||||||||||
1975 | -0.31 | e | -5.14 | g | 3.54 | e | 6.90 | 19.10 | b | 35.47 | m | 40.06 | 34.58 | 28.23 | 17.23 | 8.23 | 11.32 | 16.89 | b | |||||||
1976 | 3.32 | 3.14 | ----- | z | 11.00 | 20.33 | a | 26.83 | 38.00 | 36.13 | 32.07 | a | 16.32 | 11.73 | 2.03 | 18.26 | a | |||||||||
1977 | 0.32 | 0.64 | 7.61 | 19.53 | 26.10 | 35.17 | 40.68 | 36.65 | 30.70 | 19.52 | 16.00 | 8.00 | 20.08 | |||||||||||||
1978 | 0.21 | b | 0.43 | 11.39 | h | 21.20 | j | 28.00 | i | 37.76 | i | 41.55 | k | 39.22 | h | 32.70 | 24.67 | j | 12.80 | j | 0.25 | k | 11.11 | i | ||
1979 | -9.91 | i | 0.21 | i | 9.14 | j | 16.43 | i | 27.72 | f | 34.77 | 40.56 | d | 40.26 | h | 34.05 | k | 26.45 | i | 5.15 | j | 4.26 | l | 37.66 | j | |
1980 | 2.55 | i | -0.80 | i | 1.71 | j | 13.18 | h | 29.86 | j | 37.57 | i | 44.36 | i | 42.29 | j | 36.05 | i | 23.43 | j | 15.62 | f | 16.48 | j | ----- | z |
1981 | 2.90 | k | 6.79 | i | 8.38 | j | 24.92 | f | 31.96 | g | 41.35 | d | 44.35 | h | 41.68 | f | 37.53 | 28.48 | j | 18.53 | k | 6.52 | j | 39.44 | j | |
1982 | 3.00 | k | -0.53 | i | 14.91 | i | 17.18 | h | 30.00 | a | 36.47 | 41.39 | 44.32 | 36.67 | 22.45 | k | 13.16 | k | 6.55 | k | 37.77 | g | ||||
1983 | 6.05 | j | 6.16 | i | 9.61 | h | 10.59 | a | 25.88 | g | 35.10 | 42.32 | 44.00 | 36.30 | 25.19 | j | 14.53 | k | 0.29 | n | 33.66 | g | ||||
1984 | -5.86 | j | -3.05 | j | 3.95 | i | 12.00 | h | 25.81 | d | 33.13 | 41.00 | 39.74 | d | 32.26 | k | 18.18 | i | 9.42 | k | 1.11 | l | 34.92 | h | ||
1985 | -6.73 | i | -5.14 | 10.62 | j | 21.91 | h | 32.77 | 38.93 | 43.91 | h | 42.23 | i | 33.84 | k | 28.05 | i | 15.67 | l | 9.37 | l | 22.19 | i | |||
1986 | 6.43 | j | 11.58 | i | 16.00 | j | 24.73 | h | 30.43 | a | 39.13 | 42.71 | 43.14 | j | 35.52 | i | 27.23 | i | 18.00 | l | 3.86 | j | 37.43 | i | ||
1987 | -2.96 | d | 2.11 | i | 3.95 | i | 19.20 | 32.41 | d | 38.41 | a | 42.27 | i | 42.48 | j | 33.81 | i | 29.19 | j | 15.89 | k | 6.86 | j | 21.76 | h | |
1988 | -1.21 | l | 3.85 | i | 9.73 | i | 21.14 | i | 30.14 | c | 39.67 | 42.43 | h | 42.39 | h | 32.24 | i | 28.25 | k | 17.05 | k | 2.52 | j | 34.90 | j | |
1989 | -4.25 | k | -5.11 | j | 18.00 | h | 22.90 | j | 32.79 | b | 37.43 | 43.30 | k | 41.04 | h | 34.05 | j | 24.05 | j | 15.50 | j | 3.32 | l | 35.11 | j | |
1990 | -0.90 | k | 6.74 | i | 16.27 | i | 24.52 | i | 28.20 | f | 38.73 | 43.33 | j | 40.87 | h | 36.79 | k | 26.86 | i | 17.45 | j | 5.68 | l | 38.73 | k | |
1991 | -1.10 | j | 7.26 | i | 8.95 | j | 18.19 | i | 29.48 | d | 37.93 | 41.73 | i | 42.09 | i | 34.05 | j | 26.95 | i | 15.95 | k | 4.76 | j | 33.71 | j | |
1992 | 1.62 | j | 5.00 | j | 11.00 | j | 25.10 | j | 33.45 | b | 36.13 | 40.74 | d | 38.15 | k | 33.25 | f | 27.00 | c | 11.07 | 5.69 | e | 25.68 | f | ||
1993 | 3.61 | c | 0.46 | b | 13.89 | d | 19.43 | b | 30.45 | b | 35.45 | a | 39.46 | c | 41.87 | 32.72 | e | 25.66 | b | 10.28 | a | 4.59 | b | 21.49 | ||
1994 | 5.71 | c | 1.84 | c | 14.97 | b | 20.79 | b | 32.17 | a | 40.24 | a | 42.34 | b | 43.00 | c | 35.07 | c | 27.45 | b | 13.63 | c | 6.48 | d | 23.64 | |
1995 | 4.77 | e | 8.96 | b | 10.11 | d | 17.86 | i | 27.40 | a | 34.75 | b | 39.42 | 44.21 | c | 36.21 | p | 25.00 | r | 19.73 | s | 7.71 | g | 24.23 | e | |
1996 | 5.95 | l | 4.47 | l | 8.06 | n | 20.32 | k | 33.58 | e | 37.83 | 44.60 | f | 41.24 | j | 33.17 | a | 25.85 | d | 19.28 | a | 10.48 | b | 26.70 | f | |
1997 | 5.37 | a | 1.40 | c | 14.48 | b | 20.03 | 31.48 | b | 38.10 | 42.73 | a | 43.84 | f | 39.66 | a | 25.52 | b | 16.67 | c | 6.59 | b | 22.00 | a | ||
1998 | 8.00 | c | 6.59 | a | 12.19 | e | 17.78 | g | 30.20 | a | 35.45 | a | 45.59 | b | 43.28 | b | 39.41 | c | 28.52 | b | 23.07 | a | 11.79 | b | 25.83 | a |
1999 | 9.95 | j | 1.16 | c | 18.10 | a | 21.21 | a | 29.52 | d | 36.29 | b | 45.56 | f | 43.80 | f | 34.36 | b | 25.41 | b | 18.97 | a | 8.70 | a | 21.52 | c |
2000 | 10.87 | a | 10.85 | c | 13.33 | a | 23.64 | h | 32.55 | b | 38.92 | d | 45.16 | 44.96 | e | 36.68 | e | 28.80 | a | 11.21 | b | 8.04 | e | 25.58 | a | |
2001 | 2.77 | e | 4.69 | b | 14.47 | a | 22.63 | 30.80 | a | 38.00 | a | 41.30 | a | 42.23 | a | 33.28 | a | 24.75 | c | 16.86 | a | 7.03 | 23.23 | |||
2002 | 7.25 | c | 2.54 | b | 8.37 | d | 24.35 | d | 28.45 | 39.57 | 45.94 | 43.93 | c | 39.19 | c | 25.54 | c | 15.17 | a | 9.19 | d | 24.12 | ||||
2003 | 14.50 | c | 6.58 | b | 19.56 | f | 22.07 | b | 31.58 | 35.50 | 43.74 | 44.19 | 33.50 | b | 29.93 | b | 17.82 | b | 11.26 | 26.43 | a | |||||
2004 | 4.32 | 4.28 | d | 17.86 | b | 22.79 | a | 29.79 | b | 36.00 | a | 41.00 | p | 37.55 | b | 32.14 | i | 26.10 | b | 14.04 | b | 8.68 | c | 20.14 | b | |
2005 | 5.69 | b | 4.46 | b | 10.13 | 20.52 | a | 29.52 | b | 35.00 | 45.61 | 42.97 | b | 38.29 | b | 28.93 | c | 19.47 | 8.86 | b | 24.12 | |||||
2006 | 6.03 | b | 5.08 | b | 14.93 | b | 23.85 | c | 31.10 | a | 36.93 | 45.24 | b | 42.17 | b | ----- | z | 27.74 | d | 20.52 | e | 9.75 | g | 25.36 | b | |
2007 | -0.66 | b | 9.84 | c | 16.00 | c | 22.64 | b | 29.55 | 36.17 | 44.68 | 44.70 | a | 35.32 | b | 25.27 | e | 19.21 | b | 5.39 | c | 24.01 | ||||
2008 | -3.46 | e | 4.00 | a | 4.19 | 13.63 | c | 26.80 | a | 36.15 | c | 42.48 | 43.71 | 35.07 | a | 27.97 | a | 22.30 | 10.77 | 21.97 | ||||||
2009 | 12.10 | 9.93 | 16.81 | 22.67 | 33.29 | 36.73 | 40.68 | 37.71 | 33.87 | 24.35 | 18.37 | -0.35 | 23.85 | |||||||||||||
2010 | 2.84 | -4.18 | 4.23 | 20.43 | 28.65 | 38.63 | 43.35 | 41.94 | 34.43 | 27.00 | i | 16.03 | a | 16.39 | 22.07 | a | ||||||||||
2011 | 5.71 | 3.82 | 16.94 | 24.30 | 29.23 | 35.67 | 44.13 | 42.90 | 36.87 | 27.45 | 17.30 | 4.65 | 24.08 | |||||||||||||
2012 | 8.39 | 0.52 | 15.65 | 24.53 | 29.13 | 37.97 | 42.97 | 40.52 | 34.00 | a | 25.19 | 17.67 | 7.39 | 23.66 | ||||||||||||
2013 | -1.90 | -0.68 | 8.26 | 17.40 | 24.39 | 34.37 | 42.10 | a | 39.39 | 35.17 | 21.81 | 14.36 | h | 4.74 | 20.46 | a | ||||||||||
2014 | 5.26 | 6.79 | 8.50 | a | 16.97 | 27.16 | 33.57 | 40.52 | 38.45 | 36.00 | 28.81 | 17.33 | 10.81 | 22.51 | ||||||||||||
2015 | 9.94 | 11.36 | 17.43 | a | 23.00 | 30.90 | 40.33 | 42.68 | 42.10 | 36.87 | 31.61 | 14.60 | 7.45 | 25.69 | ||||||||||||
2016 | 1.58 | 10.55 | 18.60 | a | 23.37 | 29.03 | 41.10 | 44.68 | 41.03 | 34.73 | 28.00 | 19.80 | 9.48 | 25.16 | ||||||||||||
2017 | 5.29 | 15.89 | 20.26 | 23.30 | 29.03 | 37.90 | 41.77 | a | 37.81 | 36.37 | 25.10 | 20.80 | 13.10 | 25.55 | ||||||||||||
2018 | 10.71 | 13.68 | 15.06 | 25.63 | 27.16 | 36.27 | 41.84 | 39.19 | 34.53 | 28.16 | 14.43 | 4.39 | 24.26 | |||||||||||||
2019 | 4.97 | 4.00 | 12.39 | 24.57 | 26.29 | 32.70 | 41.16 | 40.84 | 37.07 | 21.45 | 17.10 | 4.42 | 22.25 | |||||||||||||
2020 | 4.06 | 2.45 | 14.87 | 24.00 | 32.68 | 40.20 | 44.00 | 44.03 | 35.47 | 27.77 | 18.87 | 7.29 | 24.64 | |||||||||||||
2021 | 6.52 | 8.54 | 13.39 | 22.87 | 32.03 | 41.03 | 46.90 | 42.87 | 38.43 | 28.94 | 23.79 | a | 16.00 | 26.78 | ||||||||||||
2022 | 8.74 | 3.93 | 13.61 | 22.43 | 32.42 | 40.80 | 46.58 | 45.35 | 38.73 | 28.39 | 15.57 | 8.68 | 25.44 | |||||||||||||
2023 | 6.52 | 2.33 | a | 6.00 | 18.63 | 33.03 | a | 36.13 | 45.10 | 45.06 | 36.77 | 27.45 | 17.53 | 11.48 | 23.84 | |||||||||||
2024 | 6.13 | 4.55 | 11.74 | 22.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 11.26 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.69 | 4.23 | 12.06 | 19.71 | 28.89 | 36.27 | 42.14 | 40.99 | 34.54 | 25.54 | 16.23 | 7.29 | 23.14 | |||||||||||||
S.D. | 4.35 | 4.77 | 4.70 | 4.69 | 3.43 | 3.17 | 2.48 | 3.05 | 3.19 | 3.46 | 3.69 | 3.86 | 2.36 | |||||||||||||
SKEW | -0.07 | 0.30 | -0.33 | -1.11 | -0.81 | -0.68 | -0.06 | -0.49 | -0.62 | -0.92 | -0.18 | 0.23 | -0.92 | |||||||||||||
MAX | 14.50 | 15.89 | 20.26 | 25.63 | 33.58 | 41.35 | 46.90 | 45.35 | 39.66 | 31.61 | 23.79 | 16.39 | 26.78 | |||||||||||||
MIN | -3.48 | -5.14 | 3.54 | 6.90 | 19.10 | 26.83 | 37.06 | 34.58 | 26.80 | 16.32 | 8.23 | -0.35 | 17.79 | |||||||||||||
YRS | 41 | 40 | 38 | 40 | 51 | 54 | 45 | 42 | 42 | 40 | 41 | 41 | 24 |