YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | -1.04 | f | ----- | z |
1989 | -0.54 | c | 1.91 | e | 18.87 | a | 19.50 | b | 28.54 | c | 33.10 | 39.74 | 38.80 | a | ----- | z | 18.14 | b | 10.21 | b | -1.97 | b | 18.76 | a | ||
1990 | 6.21 | b | 2.48 | a | 14.42 | e | 21.13 | 22.53 | a | 33.53 | 38.39 | 37.13 | 34.14 | b | 23.71 | 14.69 | d | -0.13 | a | 20.69 | ||||||
1991 | 0.89 | d | 7.79 | 14.69 | b | 20.78 | c | 28.87 | 37.47 | 40.81 | 40.65 | 32.24 | a | 20.94 | 11.20 | e | 3.36 | c | 21.64 | |||||||
1992 | 0.83 | b | 6.86 | 14.69 | b | 24.36 | b | 31.48 | 36.30 | 40.19 | e | 38.45 | b | 30.93 | b | 24.47 | a | 8.85 | c | 2.93 | c | 21.69 | ||||
1993 | 3.07 | b | 5.25 | 15.71 | 30.48 | a | 29.32 | 35.25 | b | 40.42 | 41.38 | b | 32.00 | f | 20.77 | a | 9.86 | b | 3.48 | d | 21.36 | a | ||||
1994 | 4.07 | b | 4.08 | b | 13.87 | 19.71 | f | 31.19 | 38.37 | 39.13 | 42.77 | 31.85 | c | 23.55 | 13.81 | d | 7.28 | b | 22.72 | a | ||||||
1995 | 6.52 | b | 11.37 | a | 14.03 | b | 20.50 | b | 28.14 | b | 36.34 | a | 38.73 | e | 42.23 | a | 33.77 | 20.93 | a | 16.43 | i | 14.20 | k | 25.26 | b | |
1996 | 4.44 | d | 10.11 | a | 11.77 | 22.28 | a | 32.50 | c | 36.23 | 42.34 | b | 39.19 | d | 32.03 | a | 22.94 | 17.11 | b | 8.57 | a | 23.29 | ||||
1997 | 6.31 | b | 7.21 | 13.84 | 17.70 | 28.82 | c | 37.00 | b | 39.58 | 42.32 | 37.25 | b | 21.78 | d | 8.16 | e | 2.34 | b | 21.86 | ||||||
1998 | 4.86 | b | 3.46 | b | 13.17 | b | 19.67 | 28.83 | a | 34.00 | c | 44.58 | 40.56 | d | 35.21 | b | 23.83 | a | 20.54 | d | 5.10 | a | 22.82 | |||
1999 | 8.93 | d | 11.04 | 18.00 | 19.07 | b | 27.94 | 35.00 | 44.34 | b | 43.29 | 32.30 | 20.13 | 15.72 | a | 3.15 | d | 23.24 | ||||||||
2000 | 8.21 | b | 13.97 | 15.97 | b | 25.20 | 34.35 | 40.17 | 43.77 | 43.65 | 34.72 | a | 23.74 | 4.00 | e | 0.63 | d | 24.03 | ||||||||
2001 | -0.40 | a | 6.33 | a | 15.00 | 23.68 | b | 27.69 | b | 36.32 | b | 40.32 | c | 38.55 | 31.44 | c | 21.72 | b | 11.38 | d | 5.17 | b | 21.43 | |||
2002 | 5.75 | c | 1.25 | 10.10 | 22.33 | c | 25.89 | d | 38.12 | d | 41.04 | c | 38.50 | a | 32.96 | b | 18.70 | a | 12.14 | b | 4.86 | b | 20.97 | |||
2003 | 9.97 | b | 5.00 | 14.29 | c | 23.23 | 28.90 | 35.17 | a | 40.75 | c | 41.19 | d | 30.67 | 25.00 | 13.85 | d | 6.62 | b | 22.89 | ||||||
2004 | 2.69 | b | 2.38 | 18.55 | 24.82 | b | 28.13 | 35.81 | d | 40.15 | d | 38.52 | b | 31.16 | e | 25.29 | 12.59 | h | 7.15 | d | 23.15 | a | ||||
2005 | 11.21 | b | 9.82 | 14.52 | 22.41 | c | 30.78 | d | 35.85 | d | 41.19 | 40.37 | a | 33.89 | c | 24.94 | 17.30 | c | 3.34 | b | 23.80 | |||||
2006 | 6.67 | d | 4.88 | c | 13.52 | 22.70 | 28.24 | b | 36.82 | b | 45.56 | f | 43.21 | b | 29.77 | 24.28 | b | 14.55 | a | 7.54 | g | 22.46 | b | |||
2007 | -3.45 | b | 10.22 | a | 17.52 | b | 21.19 | c | 30.29 | c | 36.31 | a | 43.23 | 43.69 | b | 34.64 | h | 24.62 | b | 15.26 | c | 3.24 | b | 22.01 | a | |
2008 | -1.37 | a | 6.10 | 12.77 | 16.72 | e | 27.10 | 33.40 | 40.35 | 40.45 | 32.43 | 22.57 | a | 14.33 | 5.97 | 20.90 | ||||||||||
2009 | 6.81 | 7.79 | 14.26 | 20.37 | 32.16 | 36.47 | 41.26 | 39.35 | 33.23 | 20.39 | 15.40 | -0.48 | d | 22.25 | ||||||||||||
2010 | 3.87 | -0.67 | a | 13.16 | 24.13 | 29.45 | 37.50 | 42.93 | b | 43.48 | 32.13 | 24.65 | 12.72 | a | 13.14 | c | 23.04 | |||||||||
2011 | 5.48 | b | 3.14 | 18.42 | 21.97 | 28.20 | a | 36.68 | b | 44.25 | c | 42.73 | a | 33.33 | 23.31 | b | 14.57 | 4.28 | m | 24.73 | a | |||||
2012 | 9.20 | a | 6.90 | 17.42 | 23.97 | 30.10 | 38.37 | 44.87 | 41.52 | 32.73 | 22.97 | a | 14.87 | 2.73 | a | 23.80 | ||||||||||
2013 | -0.81 | 3.39 | 13.00 | 17.70 | 27.26 | 36.80 | 44.07 | a | 42.58 | 40.00 | a | 21.58 | 14.30 | 2.39 | 21.85 | |||||||||||
2014 | 4.77 | 9.36 | 15.50 | a | 21.48 | a | 28.48 | 35.83 | 45.10 | 41.32 | 36.27 | 25.43 | a | 13.90 | 5.26 | 23.56 | ||||||||||
2015 | 10.16 | 11.25 | 19.07 | a | 23.23 | 30.74 | 41.45 | a | 43.90 | b | 42.84 | 35.57 | 30.42 | 12.63 | 3.94 | 25.43 | ||||||||||
2016 | 3.47 | a | 13.18 | a | 16.84 | 22.70 | 27.97 | 40.30 | 43.13 | a | 40.39 | 33.83 | 26.12 | g | 13.69 | a | 9.06 | 24.05 | a | |||||||
2017 | 5.00 | 15.25 | 20.16 | 21.90 | 27.74 | 39.10 | a | 43.55 | 40.42 | 37.40 | 23.19 | 21.00 | 11.10 | 25.48 | ||||||||||||
2018 | 7.00 | 10.50 | 15.58 | 21.63 | 31.06 | 37.97 | 43.87 | 41.77 | 34.27 | 23.94 | 11.50 | 3.61 | 23.56 | |||||||||||||
2019 | 3.23 | 6.82 | 14.90 | 23.97 | 26.29 | 34.70 | 41.42 | 41.94 | 37.13 | 16.29 | 13.20 | 4.84 | 22.06 | |||||||||||||
2020 | 4.68 | 2.03 | 17.90 | 18.77 | 30.52 | 37.10 | 42.39 | 40.00 | 31.13 | 21.23 | 16.37 | 1.42 | 21.96 | |||||||||||||
2021 | 8.13 | 8.61 | 13.74 | 21.30 | 30.71 | 38.37 | 44.65 | 41.10 | 35.17 | 24.81 | 17.53 | 13.32 | 24.79 | |||||||||||||
2022 | 6.65 | -0.14 | 13.65 | 23.07 | 29.35 | 39.00 | 45.58 | 43.26 | 35.53 | 21.68 | 9.77 | 7.29 | 22.89 | |||||||||||||
2023 | 4.03 | 3.32 | 11.87 | 16.83 | 30.26 | 36.93 | 43.68 | 42.39 | 33.57 | 22.13 | 14.23 | 8.35 | 22.30 | |||||||||||||
2024 | 5.71 | 9.79 | 15.84 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 10.45 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.78 | 6.72 | 15.18 | 21.79 | 29.14 | 36.77 | 42.17 | 41.14 | 33.69 | 22.77 | 13.60 | 4.91 | 22.78 | |||||||||||||
S.D. | 3.46 | 4.05 | 2.32 | 2.73 | 2.14 | 1.94 | 2.06 | 1.78 | 2.30 | 2.55 | 3.41 | 3.63 | 1.31 | |||||||||||||
SKEW | -0.39 | 0.14 | 0.25 | 0.50 | -0.36 | 0.23 | -0.12 | -0.38 | 0.67 | 0.08 | -0.31 | 0.54 | 0.41 | |||||||||||||
MAX | 11.21 | 15.25 | 20.16 | 30.48 | 34.35 | 41.45 | 45.58 | 43.69 | 40.00 | 30.42 | 21.00 | 13.32 | 25.48 | |||||||||||||
MIN | -3.45 | -0.67 | 10.10 | 16.72 | 22.53 | 33.10 | 38.39 | 37.13 | 29.77 | 16.29 | 4.00 | -1.97 | 20.69 | |||||||||||||
YRS | 36 | 36 | 36 | 34 | 35 | 35 | 34 | 35 | 32 | 34 | 33 | 32 | 26 |