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 | ----- | 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 | 26.96 | c | 34.93 | 48.94 | 57.90 | 58.10 | 60.43 | a | 48.42 | d | 37.00 | 23.00 | a | 16.16 | 41.18 | b | ||||||
1995 | 13.43 | a | 19.48 | a | 25.68 | 31.39 | b | 43.48 | 54.37 | 57.61 | 61.06 | 48.50 | b | 31.89 | d | 23.04 | d | 15.79 | c | 35.48 | ||||||
1996 | 8.93 | d | 17.40 | d | 21.65 | 34.45 | a | 48.11 | c | 56.63 | 61.26 | 58.72 | b | 49.50 | b | 36.48 | d | 22.72 | e | 12.95 | i | 37.80 | a | |||
1997 | 11.82 | i | 17.65 | h | 25.39 | c | 28.59 | a | 44.37 | a | 55.24 | a | 59.48 | 59.57 | a | 52.67 | c | 35.52 | b | 23.15 | d | 17.21 | b | 40.12 | b | |
1998 | 18.32 | c | 24.04 | 24.45 | b | 32.38 | a | 46.62 | b | 50.90 | 62.07 | a | 58.45 | 52.80 | 37.59 | b | 27.33 | 13.93 | c | 37.41 | ||||||
1999 | 17.94 | 19.56 | a | 26.97 | 33.96 | c | 44.87 | 53.57 | 62.58 | 59.94 | 48.41 | a | 32.45 | b | 24.77 | 16.29 | 36.77 | |||||||||
2000 | 15.90 | 19.96 | a | 29.63 | a | 33.93 | 45.55 | 54.87 | 60.87 | 60.23 | a | 47.90 | a | 36.97 | 18.13 | 11.74 | 36.31 | |||||||||
2001 | 10.48 | 17.75 | 26.58 | 36.80 | 46.19 | 55.23 | 63.43 | a | 58.45 | 48.30 | 33.58 | 25.90 | 15.87 | 36.55 | ||||||||||||
2002 | 14.55 | 14.61 | 18.10 | 35.93 | 42.67 | a | 59.38 | a | 61.97 | 60.60 | a | 50.14 | a | 33.27 | a | 22.69 | a | 15.97 | 35.82 | |||||||
2003 | 17.61 | 15.89 | a | 28.23 | a | 39.47 | 46.19 | 54.53 | 62.42 | 60.97 | 46.07 | 36.83 | a | 22.53 | 14.13 | a | 37.07 | |||||||||
2004 | 12.90 | 17.24 | 30.42 | 36.50 | 46.19 | 53.53 | 57.81 | 54.84 | 48.47 | 35.77 | 24.60 | 14.48 | 36.06 | |||||||||||||
2005 | 17.13 | 20.15 | a | 25.23 | 33.50 | 44.77 | 54.20 | 60.48 | 58.61 | 51.27 | 39.10 | a | 22.67 | c | 12.84 | 36.66 | ||||||||||
2006 | 16.26 | 12.86 | 23.87 | 35.77 | 45.90 | 58.27 | 62.83 | a | 60.42 | 45.20 | 35.69 | b | 23.97 | 15.19 | 36.35 | |||||||||||
2007 | -1.00 | 12.14 | 28.84 | 33.10 | 46.03 | 53.40 | 59.81 | 61.68 | 49.86 | a | 35.43 | a | 20.07 | a | 10.87 | 34.19 | ||||||||||
2008 | 9.71 | 13.66 | 24.10 | a | 30.30 | 42.16 | 53.77 | 61.03 | 58.84 | 48.30 | 36.65 | 25.70 | 13.50 | a | 34.81 | |||||||||||
2009 | 13.61 | 18.00 | 23.90 | 33.80 | 47.29 | 55.10 | 59.23 | 56.47 | a | 47.90 | 30.77 | 25.13 | 9.33 | a | 35.04 | |||||||||||
2010 | 11.58 | 17.29 | 25.26 | 35.17 | 43.52 | 58.24 | a | 62.38 | b | 60.27 | e | 50.38 | a | 36.23 | a | 19.86 | a | 17.13 | 36.44 | |||||||
2011 | 8.94 | 10.68 | 24.13 | 32.47 | 41.61 | 56.03 | 63.90 | 63.29 | 48.73 | 34.61 | 22.10 | 6.87 | 34.45 | |||||||||||||
2012 | 17.26 | 17.71 | a | 27.23 | 39.10 | 45.87 | 58.70 | 63.03 | 57.45 | 48.33 | 32.74 | 21.60 | 12.32 | 36.78 | ||||||||||||
2013 | 9.47 | a | 14.18 | 21.23 | a | 28.20 | 45.42 | 57.23 | 61.17 | a | 60.83 | a | 54.66 | a | 33.57 | a | 21.60 | 10.55 | 34.84 | |||||||
2014 | 9.40 | a | 14.54 | 22.10 | 33.97 | 44.35 | 56.60 | 60.93 | a | 57.74 | 49.83 | 38.00 | 19.20 | 16.19 | 35.24 | |||||||||||
2015 | 16.55 | b | 19.11 | 26.65 | 35.48 | a | 45.03 | 57.86 | a | 60.52 | 59.19 | 52.10 | 40.87 | 22.53 | 17.32 | 37.77 | ||||||||||
2016 | 12.61 | 19.55 | 24.97 | 34.13 | 42.58 | 57.90 | 60.90 | 57.45 | 50.17 | 35.90 | 25.83 | 8.65 | 35.89 | |||||||||||||
2017 | 14.90 | 21.21 | 27.61 | c | 37.73 | 48.29 | 58.00 | 59.89 | c | 56.23 | 50.33 | 34.65 | 26.63 | 12.29 | 37.31 | |||||||||||
2018 | 10.69 | b | 13.14 | 24.00 | 29.21 | a | 50.62 | b | 58.83 | 62.19 | 59.29 | 51.83 | 38.65 | 24.17 | 14.00 | b | 36.39 | |||||||||
2019 | 13.74 | 11.57 | 23.32 | 33.90 | 39.03 | 52.10 | 57.87 | a | 58.43 | c | 50.87 | 25.90 | 19.20 | 15.35 | 33.44 | |||||||||||
2020 | 12.42 | 13.61 | f | 25.65 | e | 29.87 | 46.90 | 56.30 | 60.68 | c | 57.68 | 44.48 | a | 28.68 | 23.30 | 12.67 | a | 36.24 | a | |||||||
2021 | 14.74 | 8.93 | 22.60 | a | 28.72 | a | 45.48 | 54.23 | 60.26 | 57.16 | 48.90 | 34.61 | 22.17 | 17.00 | 34.57 | |||||||||||
2022 | 10.65 | 11.26 | a | 20.40 | a | 31.60 | 43.26 | 55.17 | 62.20 | k | 53.53 | n | 48.23 | 33.81 | 16.47 | 5.77 | 27.66 | b | ||||||||
2023 | 15.03 | 12.04 | 20.10 | 28.87 | 48.06 | 53.43 | 59.29 | 59.35 | 48.97 | 33.94 | 21.33 | 17.10 | 34.79 | |||||||||||||
2024 | 9.90 | 20.41 | 24.84 | 28.08 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.39 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 12.88 | 16.23 | 24.84 | 33.44 | 45.31 | 55.72 | 60.83 | 59.09 | 49.38 | 34.90 | 22.71 | 13.67 | 35.86 | |||||||||||||
S.D. | 4.01 | 3.79 | 2.84 | 3.08 | 2.41 | 2.18 | 1.72 | 1.81 | 2.19 | 3.06 | 2.55 | 3.16 | 1.12 | |||||||||||||
SKEW | -1.29 | -0.06 | -0.25 | -0.04 | -0.27 | -0.13 | -0.25 | -0.11 | 0.09 | -0.83 | -0.40 | -0.90 | -0.28 | |||||||||||||
MAX | 18.32 | 24.04 | 30.42 | 39.47 | 50.62 | 59.38 | 63.90 | 63.29 | 54.66 | 40.87 | 27.33 | 17.32 | 37.77 | |||||||||||||
MIN | -1.00 | 8.93 | 18.10 | 28.20 | 39.03 | 50.90 | 57.61 | 54.84 | 44.48 | 25.90 | 16.47 | 5.77 | 33.44 | |||||||||||||
YRS | 29 | 28 | 31 | 30 | 30 | 30 | 29 | 29 | 30 | 30 | 30 | 29 | 25 |