YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1949 | 3.52 | h | 7.18 | 16.52 | 26.97 | 34.32 | 44.50 | 51.48 | 47.23 | 42.97 | 28.03 | 24.77 | 12.81 | 30.62 | a | |||||||||||
1950 | 9.97 | 19.25 | 21.71 | 29.10 | 31.55 | 39.70 | 51.81 | 45.03 | 39.83 | 36.90 | 25.10 | 11.58 | 30.13 | |||||||||||||
1951 | 9.94 | ----- | z | ----- | z | 19.03 | 37.12 | o | 43.20 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.06 | i | |||
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 | 33.32 | c | 43.71 | b | 51.48 | ----- | z | 44.30 | 34.39 | 28.97 | 26.60 | a | 37.54 | e | ||||
1981 | 23.35 | 21.93 | a | 23.00 | 33.63 | 37.16 | 49.47 | 55.13 | 50.70 | a | 45.87 | 30.26 | 28.21 | a | 25.69 | b | 35.37 | |||||||||
1982 | 18.10 | a | 21.11 | 23.00 | b | 27.25 | b | 37.00 | d | 43.47 | 49.72 | b | 51.30 | a | 43.39 | b | 31.32 | c | 24.93 | 18.59 | b | 32.43 | ||||
1983 | 20.42 | 23.19 | a | 24.32 | 23.82 | b | 33.84 | 42.40 | 50.38 | b | 47.61 | 47.03 | 33.17 | a | 26.20 | 25.90 | 33.19 | |||||||||
1984 | 20.71 | 20.89 | a | 25.81 | 27.17 | 41.03 | 43.93 | 51.00 | a | 48.68 | 43.19 | d | 28.24 | b | 21.73 | 13.32 | 32.14 | |||||||||
1985 | 15.26 | 18.78 | a | 22.58 | 32.60 | 38.16 | 45.00 | a | 51.42 | 49.68 | 39.67 | 32.73 | a | 22.73 | 20.21 | b | 32.40 | |||||||||
1986 | 24.97 | a | 23.07 | a | 26.13 | a | 29.27 | 35.97 | b | 45.59 | a | 49.57 | a | 51.87 | 38.07 | 29.29 | 26.17 | 19.53 | a | 33.29 | ||||||
1987 | 16.10 | b | 18.14 | 19.81 | 30.90 | 32.90 | 43.13 | 46.13 | a | 48.67 | a | 42.23 | 35.73 | a | 24.87 | 11.24 | b | 30.82 | ||||||||
1988 | 16.23 | a | 21.52 | b | 22.17 | a | 28.80 | 34.26 | 45.10 | 51.53 | a | 48.65 | 39.93 | 38.55 | 26.40 | 13.31 | b | 32.20 | ||||||||
1989 | 12.61 | c | 18.20 | c | 26.17 | b | 33.87 | 35.83 | a | 42.87 | 52.84 | 48.84 | 44.10 | 31.61 | 24.10 | 21.48 | 32.71 | |||||||||
1990 | 18.07 | a | 15.07 | 30.65 | h | 35.23 | 38.87 | 46.30 | 47.93 | a | 45.68 | 42.43 | 30.61 | 23.53 | 9.45 | 32.11 | a | |||||||||
1991 | 15.16 | 20.50 | 14.71 | 24.55 | a | 27.52 | 38.90 | 45.19 | 44.35 | 37.40 | 31.90 | a | 21.40 | 15.45 | 28.09 | |||||||||||
1992 | 12.48 | 16.36 | a | 20.68 | 26.93 | 34.13 | 36.67 | 42.16 | 44.81 | 39.17 | 30.32 | 16.00 | a | 7.93 | c | 27.30 | ||||||||||
1993 | 11.13 | 12.25 | 19.00 | 22.83 | 30.74 | 33.30 | 40.23 | 41.00 | 32.63 | 24.39 | 16.43 | 11.94 | 24.66 | |||||||||||||
1994 | 13.19 | 8.18 | 18.63 | a | 21.10 | 28.06 | 40.93 | 42.71 | 43.81 | 35.27 | 22.42 | 8.97 | ----- | z | 25.75 | a | ||||||||||
1995 | 9.72 | b | 15.61 | 13.57 | a | 18.07 | 23.29 | 28.57 | 36.90 | b | 41.03 | a | 34.03 | a | 22.10 | 19.10 | a | 9.81 | 22.65 | |||||||
1996 | 11.96 | c | 13.14 | 13.77 | 19.83 | a | 26.83 | b | 33.76 | a | 42.19 | 38.66 | b | 31.00 | 24.81 | 26.13 | 22.39 | 25.37 | ||||||||
1997 | 18.52 | d | 21.11 | a | 26.71 | 28.32 | b | 40.52 | b | 43.71 | b | 47.41 | b | 50.77 | 42.56 | c | 30.76 | b | 25.70 | 18.16 | 32.85 | |||||
1998 | 21.79 | b | 18.31 | b | 22.61 | 23.79 | a | 32.61 | 39.43 | 50.00 | a | 51.74 | 42.43 | 30.97 | 26.60 | 20.40 | a | 31.72 | ||||||||
1999 | 24.17 | a | 22.29 | 25.79 | b | 24.70 | 34.94 | 42.47 | 52.71 | 48.63 | a | 43.13 | 34.52 | d | 28.90 | a | 21.60 | f | 34.75 | a | ||||||
2000 | 22.72 | b | 22.38 | 20.47 | a | 26.24 | a | 38.37 | a | 44.87 | 49.80 | a | 53.18 | c | 43.17 | 34.83 | a | 21.28 | a | 22.89 | d | 33.35 | ||||
2001 | 15.59 | b | 19.85 | b | 27.37 | a | 27.83 | 42.03 | a | 47.57 | 49.55 | 51.37 | a | 46.00 | a | 37.97 | 26.59 | a | 21.25 | c | 34.41 | |||||
2002 | 19.56 | d | 22.35 | b | 21.59 | b | 33.41 | c | 36.26 | d | 46.83 | a | 52.31 | b | 52.10 | b | 44.10 | a | 27.37 | a | 22.25 | b | 16.93 | a | 32.92 | |
2003 | 24.50 | a | 18.71 | 22.84 | 24.52 | c | 30.32 | 40.29 | b | 52.73 | a | 52.00 | a | 46.10 | 47.23 | a | 26.47 | 19.81 | j | 35.06 | a | |||||
2004 | 19.79 | c | 18.75 | a | 30.00 | a | 31.73 | 39.97 | a | 45.53 | 49.94 | 50.03 | b | 41.83 | 33.27 | a | 23.33 | 20.28 | b | 33.70 | ||||||
2005 | 19.83 | b | 21.29 | 25.35 | 29.31 | a | 39.00 | 44.40 | 51.90 | 49.06 | 41.73 | 35.32 | 29.57 | 23.29 | 34.17 | |||||||||||
2006 | 22.32 | 22.04 | 20.26 | 30.37 | 39.03 | 47.97 | 53.06 | 49.35 | 40.13 | 32.42 | 28.07 | 21.87 | 33.91 | |||||||||||||
2007 | 16.61 | 22.61 | 27.32 | 31.87 | 39.23 | 45.44 | c | 54.13 | a | 53.17 | a | 44.70 | 34.13 | 28.97 | 18.58 | 34.73 | ||||||||||
2008 | 17.14 | b | 19.72 | 24.58 | 29.30 | 35.19 | 44.67 | 52.13 | 52.13 | 43.17 | 33.39 | 30.30 | 19.55 | 33.44 | ||||||||||||
2009 | 22.83 | a | 19.75 | 22.97 | 28.73 | 41.03 | 42.13 | 52.87 | 49.42 | 46.00 | 32.37 | a | 27.50 | 17.29 | 33.57 | |||||||||||
2010 | 20.74 | 19.82 | 23.61 | 26.03 | 32.87 | 46.43 | 54.26 | 50.65 | 45.30 | 36.35 | 26.00 | 27.35 | 34.12 | |||||||||||||
2011 | 20.52 | 20.36 | 25.71 | 29.80 | 34.97 | 43.40 | 51.23 | 51.97 | 44.70 | 35.61 | 25.47 | 17.65 | 33.45 | |||||||||||||
2012 | 24.61 | 21.55 | 28.06 | 32.00 | 40.39 | 46.90 | 51.00 | 52.61 | 45.37 | 37.39 | 29.57 | 21.29 | 35.89 | |||||||||||||
2013 | 17.03 | 19.46 | 28.68 | 30.70 | 37.55 | 48.17 | 53.65 | 51.26 | 42.07 | 29.58 | 26.60 | 19.00 | 33.64 | |||||||||||||
2014 | 25.19 | 24.50 | 25.87 | 30.63 | 39.97 | 46.27 | 56.13 | 52.94 | 52.00 | 41.45 | 28.50 | 23.81 | 37.27 | |||||||||||||
2015 | 25.32 | 28.25 | 28.42 | 29.87 | 36.23 | 49.20 | 50.23 | 53.65 | 48.30 | 38.58 | 23.67 | 19.74 | 35.95 | |||||||||||||
2016 | 19.55 | 24.31 | 28.26 | 32.10 | 34.94 | 51.37 | 53.61 | 51.90 | 43.17 | 38.87 | 28.48 | a | 21.29 | 35.65 | ||||||||||||
2017 | 17.63 | a | 26.32 | 27.50 | a | 32.37 | 37.81 | 49.00 | 54.84 | 50.55 | 42.17 | 32.68 | 32.67 | 24.68 | 35.68 | |||||||||||
2018 | 24.97 | 20.07 | a | 26.03 | 34.00 | 39.00 | 48.17 | 53.65 | 53.33 | a | 47.40 | 33.03 | 26.37 | 21.17 | a | 35.60 | ||||||||||
2019 | 22.13 | 14.46 | 22.35 | 31.93 | 33.16 | 44.87 | 52.55 | 51.94 | 43.33 | 29.33 | a | 26.43 | 21.83 | a | 32.86 | |||||||||||
2020 | 22.65 | 22.66 | 24.52 | 29.17 | 40.13 | 44.67 | 53.23 | 54.13 | a | 46.83 | 38.03 | 26.57 | 20.81 | 35.28 | ||||||||||||
2021 | 20.13 | 21.96 | 22.61 | 32.10 | 38.27 | a | 50.64 | b | 53.96 | c | 51.03 | 45.83 | a | 32.57 | a | 30.31 | a | 20.27 | a | 34.97 | ||||||
2022 | 19.00 | 19.76 | c | 26.23 | a | 29.97 | 35.60 | a | 47.56 | c | 54.55 | b | 51.71 | 46.73 | 36.24 | b | 19.79 | f | 22.26 | 35.42 | a | |||||
2023 | 18.58 | 15.81 | a | 14.88 | g | 23.83 | 35.26 | d | 40.37 | 54.71 | 51.19 | e | 39.89 | b | 28.15 | d | 26.50 | 24.32 | 32.60 | a | ||||||
2024 | 21.48 | 25.14 | 21.83 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.31 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.79 | 19.74 | 23.43 | 28.38 | 35.64 | 43.89 | 50.56 | 49.54 | 42.62 | 32.81 | 25.30 | 19.14 | 32.68 | |||||||||||||
S.D. | 4.46 | 4.15 | 3.98 | 4.16 | 4.12 | 4.48 | 4.18 | 3.58 | 4.08 | 4.84 | 4.21 | 4.88 | 3.23 | |||||||||||||
SKEW | -0.44 | -1.00 | -0.78 | -0.68 | -0.86 | -1.22 | -1.48 | -1.30 | -0.79 | 0.15 | -1.61 | -0.60 | -1.53 | |||||||||||||
MAX | 25.32 | 28.25 | 30.00 | 35.23 | 42.03 | 51.37 | 56.13 | 54.13 | 52.00 | 47.23 | 32.67 | 27.35 | 37.27 | |||||||||||||
MIN | 9.72 | 7.18 | 13.57 | 18.07 | 23.29 | 28.57 | 36.90 | 38.66 | 31.00 | 22.10 | 8.97 | 7.93 | 22.65 | |||||||||||||
YRS | 46 | 46 | 43 | 46 | 46 | 47 | 46 | 45 | 46 | 46 | 45 | 43 | 38 |