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 | 28.71 | q | ----- | z | 23.52 | j | ----- | z |
1981 | 19.65 | e | 17.19 | b | 26.26 | 39.93 | a | 42.57 | c | 54.43 | b | 59.29 | c | 56.00 | 51.00 | a | 38.23 | a | 29.07 | a | 19.48 | 37.76 | ||||
1982 | 13.04 | d | 20.37 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.70 | j |
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 | 36.97 | 47.42 | 51.97 | 61.13 | 58.39 | 48.20 | 35.81 | 20.00 | a | 15.06 | 41.66 | c | ||||||||
1986 | 24.63 | a | 20.63 | a | 31.71 | 37.20 | 44.45 | 57.30 | 61.29 | 58.48 | 50.17 | 39.03 | 24.67 | 19.13 | 39.06 | |||||||||||
1987 | 19.45 | 25.57 | 25.61 | 36.33 | 49.33 | j | ----- | z | ----- | z | 53.67 | j | 46.17 | 31.90 | a | 25.60 | 17.00 | c | 28.45 | d | ||||||
1988 | 9.65 | 18.31 | 22.74 | 31.15 | c | 45.79 | b | 57.34 | a | 58.61 | 58.84 | 47.19 | d | 35.61 | 24.62 | a | 16.45 | 35.53 | ||||||||
1989 | 14.61 | 9.43 | 24.84 | 34.62 | d | 44.94 | 51.50 | 59.42 | 56.79 | c | 45.30 | 34.87 | 25.03 | 11.16 | 34.38 | |||||||||||
1990 | 15.74 | 16.75 | 26.97 | 34.17 | 41.87 | 55.67 | 58.07 | b | 55.68 | 51.40 | 36.27 | a | 26.30 | 11.23 | a | 35.84 | ||||||||||
1991 | 12.13 | 21.63 | a | 26.29 | 34.87 | 47.37 | a | 57.48 | a | 59.60 | a | 56.65 | 46.97 | 34.71 | 22.27 | 19.35 | 36.61 | |||||||||
1992 | 15.34 | b | 27.21 | a | 29.90 | 36.43 | 45.65 | 52.80 | 56.68 | 55.03 | b | 47.28 | a | 36.13 | 21.20 | 9.61 | 36.11 | |||||||||
1993 | 11.65 | 12.04 | 26.00 | 32.67 | 43.10 | a | 50.77 | 57.52 | 55.61 | 43.93 | 35.29 | 19.13 | 18.65 | 33.86 | ||||||||||||
1994 | 16.10 | 11.25 | 26.55 | 33.47 | 47.61 | 58.17 | 55.67 | a | 58.55 | 51.32 | h | 37.16 | 23.63 | c | 21.47 | a | 35.42 | a | ||||||||
1995 | 16.57 | a | 23.25 | d | 28.80 | a | 34.57 | 44.77 | 53.29 | b | 60.43 | a | 61.60 | f | 52.47 | 37.61 | 29.47 | 19.13 | 36.40 | a | ||||||
1996 | 10.39 | 13.60 | d | 19.48 | 31.63 | 45.61 | 56.03 | 59.32 | 56.96 | g | 49.29 | b | 34.68 | 21.00 | 14.48 | 32.32 | a | |||||||||
1997 | 13.07 | a | 17.36 | c | 24.16 | 27.73 | 40.58 | 53.97 | 57.55 | b | 57.18 | i | 50.27 | 34.03 | 23.10 | 18.71 | 32.78 | a | ||||||||
1998 | 17.41 | d | 24.64 | 22.71 | 30.97 | 46.68 | 48.70 | c | 60.90 | 57.00 | 50.97 | 37.06 | 28.20 | 13.97 | 36.60 | |||||||||||
1999 | 17.42 | 20.50 | 24.52 | 32.10 | 43.84 | 53.13 | 60.97 | 56.92 | g | 45.27 | 34.03 | 27.47 | 20.68 | 34.54 | a | |||||||||||
2000 | 17.48 | 22.43 | f | 29.58 | 33.53 | 45.58 | 52.63 | 59.77 | 59.23 | 48.40 | 38.77 | 18.40 | 11.39 | 37.71 | a | |||||||||||
2001 | 15.63 | d | 16.93 | 25.59 | i | 35.14 | b | 45.03 | 54.10 | 61.71 | 58.77 | 48.97 | 35.16 | 26.03 | 17.94 | 37.76 | a | |||||||||
2002 | 15.29 | 16.32 | 17.42 | 34.37 | 42.35 | 58.25 | f | 60.07 | a | 57.48 | 48.20 | 32.94 | 26.23 | 18.74 | 33.58 | a | ||||||||||
2003 | 18.21 | b | 14.75 | 27.19 | 37.40 | 45.16 | 52.10 | 60.06 | 58.61 | 44.14 | a | 37.97 | 21.50 | 15.81 | 36.08 | |||||||||||
2004 | 15.61 | 16.24 | 26.71 | 32.63 | 45.10 | a | 52.30 | 56.90 | 52.40 | f | 50.70 | 38.52 | 25.87 | 18.58 | 34.47 | a | ||||||||||
2005 | 17.41 | b | 19.43 | e | 25.30 | d | 34.83 | 43.84 | 55.20 | 59.42 | 57.03 | 50.57 | 37.74 | 28.93 | 15.16 | 37.07 | ||||||||||
2006 | 19.00 | a | 16.87 | e | 23.26 | 33.73 | 44.97 | 56.13 | 61.94 | 59.55 | 44.00 | 35.42 | 24.70 | 15.97 | 36.29 | |||||||||||
2007 | 6.29 | 14.07 | 31.12 | g | 33.07 | 46.26 | d | 54.63 | 60.39 | 61.61 | 49.33 | 37.30 | a | 21.70 | 9.81 | 35.86 | a | |||||||||
2008 | 9.13 | 18.00 | 24.24 | b | 32.37 | k | 42.94 | o | 51.53 | k | 62.57 | j | 58.32 | i | 44.90 | 35.74 | d | 26.03 | 10.63 | d | 24.10 | e | ||||
2009 | 14.27 | e | 19.46 | 22.58 | 31.57 | 44.03 | 52.38 | a | 57.06 | 56.67 | a | 48.27 | 29.10 | a | 27.00 | 11.23 | 34.47 | |||||||||
2010 | 14.82 | c | 14.54 | 25.90 | 34.19 | c | 41.00 | 56.20 | 60.07 | a | 58.58 | 48.73 | 36.58 | 22.70 | 17.16 | 35.87 | ||||||||||
2011 | 13.23 | 11.11 | 24.65 | 33.20 | 39.90 | 52.90 | 61.27 | a | 60.29 | 47.13 | 35.16 | 22.30 | 15.58 | 34.73 | ||||||||||||
2012 | 15.87 | 16.72 | 29.67 | g | 39.00 | 45.90 | b | 57.37 | 61.71 | 56.87 | 48.62 | a | 33.00 | a | 24.43 | 14.52 | 37.64 | a | ||||||||
2013 | 13.61 | 15.86 | 20.16 | 27.40 | 42.80 | a | 53.62 | a | 58.57 | a | 58.48 | b | 51.97 | 34.58 | 22.72 | a | 11.39 | 34.26 | ||||||||
2014 | 16.95 | k | 17.50 | v | 24.03 | a | 32.96 | c | 42.87 | 53.07 | 59.42 | 57.00 | 48.40 | 37.97 | b | 20.23 | 15.90 | 39.19 | b | |||||||
2015 | 17.19 | 15.00 | m | 27.61 | 35.83 | 42.61 | 59.15 | j | 59.47 | a | 58.16 | 52.60 | e | 41.13 | 26.03 | 19.10 | a | 37.97 | b | |||||||
2016 | 18.14 | b | 23.44 | b | 28.47 | a | 34.43 | 43.17 | b | 57.17 | 59.56 | d | 55.55 | b | 49.23 | 37.69 | b | 29.35 | g | 13.00 | e | 38.17 | a | |||
2017 | 13.83 | b | 22.67 | a | 28.72 | b | 36.14 | a | 43.61 | 54.67 | f | 60.56 | d | 54.69 | b | 48.80 | 37.33 | m | 27.03 | 14.71 | c | 35.08 | b | |||
2018 | 15.97 | 14.00 | 25.87 | 28.93 | 48.17 | a | 56.33 | 59.70 | a | 55.35 | e | 50.90 | 33.23 | a | 22.83 | 17.52 | 35.73 | |||||||||
2019 | 15.74 | 10.32 | 25.81 | d | 34.33 | 40.61 | 51.77 | 60.20 | a | 60.62 | b | 52.93 | a | 27.72 | b | 22.19 | d | 20.90 | a | 35.26 | ||||||
2020 | 17.96 | c | 14.34 | 28.75 | c | 29.23 | 44.72 | b | 56.45 | a | 61.07 | d | 59.00 | a | 46.72 | a | 29.68 | 26.50 | b | 17.83 | a | 36.02 | ||||
2021 | 17.81 | 10.37 | a | 25.50 | a | 30.70 | 45.32 | c | 55.87 | 58.75 | c | 57.17 | b | 50.96 | c | 36.00 | a | 26.66 | a | 16.25 | c | 35.95 | ||||
2022 | 12.23 | 12.86 | 21.61 | 28.43 | 43.90 | 55.23 | 62.42 | 56.68 | 51.55 | h | ----- | z | ----- | z | ----- | z | 36.67 | d | ||||||||
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.30 | 17.17 | 25.43 | 33.58 | 44.30 | 54.35 | 59.64 | 57.64 | 48.66 | 35.51 | 24.35 | 15.91 | 35.87 | |||||||||||||
S.D. | 3.38 | 4.56 | 3.02 | 2.94 | 2.04 | 2.29 | 1.59 | 1.69 | 2.49 | 2.80 | 2.87 | 3.33 | 1.24 | |||||||||||||
SKEW | -0.19 | 0.30 | -0.47 | -0.20 | -0.24 | -0.25 | -0.55 | 0.27 | -0.26 | -0.84 | -0.16 | -0.35 | 0.60 | |||||||||||||
MAX | 24.63 | 27.21 | 31.71 | 39.93 | 48.17 | 58.17 | 62.42 | 61.61 | 52.93 | 41.13 | 29.47 | 21.47 | 39.06 | |||||||||||||
MIN | 6.29 | 9.43 | 17.42 | 27.40 | 39.90 | 48.70 | 55.67 | 54.69 | 43.93 | 27.72 | 18.40 | 9.61 | 33.86 | |||||||||||||
YRS | 38 | 36 | 35 | 38 | 37 | 34 | 37 | 32 | 37 | 37 | 37 | 38 | 20 |