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 | 34.75 | c | 23.42 | d | 25.46 | g | 29.09 | j |
1981 | 17.69 | e | 20.00 | i | 30.42 | e | 39.80 | j | 42.60 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.06 | 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 | 36.47 | a | 26.52 | a | 10.55 | 24.51 | i | |
1990 | 17.26 | 19.93 | 28.10 | a | 35.87 | 42.07 | a | 57.47 | 57.77 | 56.61 | 53.03 | 35.23 | 28.53 | 10.47 | a | 36.86 | ||||||||||
1991 | 14.29 | 23.79 | 28.10 | 35.17 | 45.77 | a | 56.97 | a | 58.93 | a | 58.00 | 48.86 | b | 35.10 | a | 23.23 | 20.80 | a | 37.42 | |||||||
1992 | 19.61 | 24.93 | 29.16 | 37.83 | a | 45.88 | e | 50.96 | c | 56.74 | d | 54.41 | i | 47.97 | 35.60 | a | 20.32 | b | 16.87 | 35.08 | a | |||||
1993 | 16.60 | a | 17.41 | a | 27.10 | a | 34.87 | 44.48 | 53.10 | 58.77 | 57.55 | 45.26 | c | 32.97 | 20.31 | a | 17.58 | 35.50 | ||||||||
1994 | 15.68 | 15.32 | 29.45 | 33.14 | b | 48.40 | a | 57.87 | 57.77 | 60.13 | 50.14 | a | 37.23 | a | 26.60 | 21.42 | 37.76 | |||||||||
1995 | 18.13 | 23.14 | 26.52 | 30.46 | b | 40.72 | b | 51.87 | 57.23 | a | 59.93 | a | 47.57 | b | 33.93 | b | 26.31 | a | 18.03 | a | 36.15 | |||||
1996 | 12.42 | 17.79 | a | 22.94 | 33.24 | a | 45.57 | a | 54.37 | 57.90 | b | 55.81 | 45.55 | a | 35.29 | 26.73 | 16.29 | 35.32 | ||||||||
1997 | 13.94 | 19.93 | 28.26 | 27.53 | 42.21 | c | 52.88 | d | 58.26 | 57.13 | a | 50.87 | 34.71 | 23.13 | 14.19 | 35.25 | ||||||||||
1998 | 21.35 | 24.14 | 24.45 | 31.97 | a | 44.72 | f | 49.83 | 59.45 | b | 55.30 | a | 53.75 | b | 39.76 | f | 29.46 | b | 16.13 | a | 36.58 | b | ||||
1999 | 19.83 | a | 22.79 | 27.87 | a | 32.10 | 40.83 | a | 51.47 | 59.10 | 57.32 | 46.13 | 32.67 | a | 26.10 | 17.16 | 36.11 | |||||||||
2000 | 19.48 | 23.34 | 28.77 | 32.76 | a | 44.28 | b | 53.13 | 59.87 | 58.39 | 50.00 | 38.53 | a | 19.59 | c | 14.26 | h | 38.92 | a | |||||||
2001 | 14.48 | 19.04 | a | 27.80 | a | 37.00 | e | 45.39 | c | 56.03 | 63.19 | 59.00 | 49.43 | 36.45 | 31.41 | a | 17.81 | 38.09 | ||||||||
2002 | 16.37 | a | 18.79 | 21.48 | 37.50 | ----- | z | 61.10 | a | 62.35 | 60.57 | a | 52.66 | a | 35.03 | 24.40 | e | 19.68 | 37.27 | a | ||||||
2003 | 22.52 | 18.74 | a | 29.55 | 38.38 | a | 46.43 | c | 52.80 | 64.32 | 60.32 | 47.67 | 39.48 | 26.00 | 19.42 | 38.80 | ||||||||||
2004 | 18.06 | 19.90 | 31.71 | 35.67 | 47.13 | 53.23 | 57.84 | 55.52 | 51.10 | 38.81 | 26.29 | b | 19.74 | 37.92 | ||||||||||||
2005 | 20.39 | 23.61 | 25.94 | 33.73 | 46.45 | 54.17 | 59.31 | b | 56.32 | 52.38 | a | 38.16 | 26.32 | b | 16.86 | c | 37.80 | |||||||||
2006 | 20.23 | 15.25 | 26.07 | a | 37.97 | 46.58 | 58.10 | a | 61.43 | a | 58.70 | a | ----- | z | 35.45 | 27.03 | a | 16.71 | 36.68 | a | ||||||
2007 | 7.13 | 16.14 | 31.35 | 33.50 | 45.10 | 52.90 | a | 59.23 | 61.37 | a | 51.83 | a | 37.48 | 25.38 | a | 12.94 | 36.19 | |||||||||
2008 | 12.61 | 18.45 | 25.10 | a | 31.86 | b | 42.16 | 53.60 | 60.97 | 59.29 | 48.87 | 36.90 | 27.80 | 18.32 | 36.33 | |||||||||||
2009 | 17.97 | 21.54 | 26.26 | 34.13 | 46.42 | 53.93 | 59.39 | 56.26 | 47.73 | 30.58 | 28.63 | 11.39 | 36.19 | |||||||||||||
2010 | 15.45 | 18.21 | 26.42 | 36.97 | 43.52 | 57.97 | 61.74 | 60.00 | 52.63 | 38.13 | 22.67 | 20.29 | 37.83 | |||||||||||||
2011 | 13.10 | 13.32 | 27.97 | 34.30 | 41.03 | 56.73 | 63.71 | 62.58 | 48.80 | 35.94 | 26.53 | 12.32 | 36.36 | |||||||||||||
2012 | 21.81 | 20.83 | 30.58 | 39.53 | 45.84 | 61.07 | 64.39 | 59.74 | 49.43 | 34.10 | 29.13 | 18.58 | 39.59 | |||||||||||||
2013 | 13.94 | 18.82 | 24.06 | 29.97 | 44.68 | 58.60 | 61.35 | 59.31 | e | 55.03 | 36.10 | 25.70 | 16.00 | 36.96 | ||||||||||||
2014 | 15.16 | 17.00 | 25.74 | 35.67 | 44.26 | 55.87 | 60.77 | 57.32 | 51.27 | 40.00 | 23.70 | 16.87 | 36.97 | |||||||||||||
2015 | 19.71 | 21.07 | 27.90 | 36.30 | 43.90 | 56.10 | 59.87 | 59.39 | 54.37 | 42.77 | 27.40 | 19.90 | 39.06 | |||||||||||||
2016 | 19.42 | 20.72 | 27.52 | 34.37 | 41.52 | 56.33 | 60.48 | 57.81 | 51.33 | 39.61 | 30.00 | 14.61 | 37.81 | |||||||||||||
2017 | 16.65 | 27.36 | 30.16 | 35.70 | 42.39 | 54.97 | 60.13 | 56.10 | 51.33 | 35.03 | 30.63 | 16.03 | 38.04 | |||||||||||||
2018 | 17.10 | 17.57 | 26.58 | 32.53 | 49.90 | 60.40 | 60.87 | 58.16 | 53.13 | 36.16 | 23.90 | a | 17.16 | 37.79 | ||||||||||||
2019 | 17.13 | 16.18 | 23.74 | 34.40 | 39.26 | 52.97 | 61.06 | 59.81 | 55.27 | 28.97 | 23.37 | 18.94 | 35.92 | |||||||||||||
2020 | 18.26 | 15.76 | 29.58 | 30.80 | 46.48 | 58.00 | 61.10 | 60.03 | 46.87 | 31.97 | 29.73 | 17.71 | 37.19 | |||||||||||||
2021 | 18.84 | 14.21 | 27.45 | 31.43 | 46.45 | 56.40 | 60.81 | 59.42 | 53.10 | 37.35 | 27.77 | 21.35 | 37.88 | |||||||||||||
2022 | 15.86 | b | 12.96 | 24.61 | 32.80 | 44.03 | 56.83 | 62.84 | 58.90 | 51.27 | 36.71 | 22.03 | 15.65 | 36.21 | ||||||||||||
2023 | 15.48 | 17.36 | 23.74 | 31.57 | 48.03 | 53.57 | 59.65 | 60.23 | 52.50 | 36.61 | 26.50 | 22.32 | 37.30 | |||||||||||||
2024 | 13.65 | 24.72 | 27.42 | 34.13 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.93 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.88 | 19.43 | 27.22 | 34.15 | 44.60 | 55.34 | 60.25 | 58.55 | 50.52 | 36.01 | 25.91 | 17.06 | 37.12 | |||||||||||||
S.D. | 3.14 | 3.56 | 2.43 | 2.71 | 2.50 | 2.86 | 2.00 | 1.80 | 2.72 | 2.71 | 2.94 | 3.04 | 1.11 | |||||||||||||
SKEW | -0.64 | 0.19 | -0.26 | -0.13 | -0.19 | 0.24 | 0.36 | -0.07 | -0.20 | -0.20 | -0.29 | -0.53 | 0.19 | |||||||||||||
MAX | 22.52 | 27.36 | 31.71 | 39.53 | 49.90 | 61.10 | 64.39 | 62.58 | 55.27 | 42.77 | 31.41 | 22.32 | 39.59 | |||||||||||||
MIN | 7.13 | 12.96 | 21.48 | 27.53 | 39.26 | 49.83 | 56.74 | 55.30 | 45.26 | 28.97 | 19.59 | 10.47 | 35.25 | |||||||||||||
YRS | 36 | 35 | 36 | 34 | 32 | 34 | 34 | 33 | 33 | 35 | 36 | 34 | 29 |