YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.47 | a | 19.47 | k |
1995 | 17.10 | 18.89 | a | 22.32 | 26.53 | 34.84 | 44.03 | 50.20 | a | 53.19 | 41.87 | 30.79 | b | 24.70 | 18.42 | 31.91 | ||||||||||
1996 | 12.90 | 17.21 | a | 17.90 | 29.93 | 38.45 | 46.83 | 52.16 | 49.03 | 40.76 | a | 31.00 | 23.10 | 17.87 | a | 31.43 | ||||||||||
1997 | 14.40 | a | 15.64 | 23.55 | 24.37 | 37.33 | a | 47.67 | 50.39 | 50.45 | 45.63 | 31.71 | 19.80 | 16.97 | a | 31.49 | ||||||||||
1998 | 21.03 | a | 19.36 | 19.55 | 27.10 | 38.23 | 39.97 | 52.52 | 51.42 | 46.90 | 33.06 | 27.40 | 13.58 | 32.51 | ||||||||||||
1999 | 19.65 | 22.62 | b | 21.97 | 26.80 | 36.32 | 44.50 | 52.58 | 51.58 | 37.50 | 31.74 | 28.20 | 18.90 | a | 32.70 | |||||||||||
2000 | 19.10 | 22.10 | 23.45 | 30.20 | 39.77 | 45.20 | 54.23 | 54.55 | 40.80 | 32.39 | 15.43 | 11.81 | 32.42 | |||||||||||||
2001 | 15.57 | a | 13.71 | 22.35 | 29.47 | 38.97 | 45.40 | 53.55 | 52.77 | 43.21 | a | 30.19 | 22.83 | 17.13 | 32.10 | |||||||||||
2002 | 13.42 | 12.82 | 15.03 | 30.30 | 34.77 | 47.43 | 53.45 | 48.03 | 44.66 | a | 24.81 | 21.38 | a | 20.63 | a | 30.56 | ||||||||||
2003 | 22.80 | a | 13.50 | 24.97 | 30.33 | 36.97 | b | 42.37 | 54.19 | 51.60 | a | 37.37 | 32.77 | 20.52 | a | 17.55 | 32.08 | |||||||||
2004 | 17.50 | a | 13.41 | 24.93 | b | 28.63 | 36.35 | 42.50 | 51.58 | e | 47.37 | a | 43.37 | 32.26 | 21.50 | 17.90 | a | 31.44 | ||||||||
2005 | 18.35 | 19.00 | 23.29 | 28.37 | 37.46 | e | 41.63 | 53.39 | 49.34 | b | 42.10 | 33.23 | a | 24.33 | 14.52 | 32.09 | ||||||||||
2006 | 20.84 | 13.57 | 17.16 | 30.63 | 36.77 | 47.97 | a | 56.29 | 52.29 | 39.17 | 31.13 | 23.33 | 16.94 | 32.17 | ||||||||||||
2007 | 10.47 | a | 18.04 | 24.87 | 28.43 | 37.13 | a | 45.21 | a | 55.87 | 53.84 | 43.80 | 32.81 | 21.03 | 12.06 | 31.96 | ||||||||||
2008 | 12.52 | 16.90 | 19.19 | 23.57 | 35.60 | a | 43.87 | 52.13 | 50.57 | a | 40.40 | 32.32 | 26.34 | a | 12.61 | 30.50 | ||||||||||
2009 | 17.97 | 20.64 | 20.97 | 27.33 | 39.33 | a | 43.80 | ----- | z | 46.06 | 41.77 | 24.94 | 23.07 | a | 10.65 | 28.78 | a | |||||||||
2010 | 17.37 | a | 12.33 | a | 23.71 | 28.66 | a | 34.26 | 46.17 | 50.65 | 51.03 | 40.80 | 33.61 | 20.87 | 19.03 | a | 31.54 | |||||||||
2011 | 17.19 | 12.86 | 23.10 | 28.77 | 34.35 | 42.23 | 54.58 | 51.71 | 42.43 | 32.16 | 23.20 | 13.19 | 31.32 | |||||||||||||
2012 | 20.84 | 13.21 | 27.74 | 32.97 | 38.06 | 50.43 | 55.29 | 51.81 | 45.07 | 29.63 | a | 25.97 | 14.13 | 33.76 | ||||||||||||
2013 | 16.93 | a | 14.68 | 19.97 | 22.45 | a | 38.17 | a | 46.07 | 52.35 | 51.84 | 44.67 | 28.26 | 19.60 | 13.67 | a | 30.72 | |||||||||
2014 | 17.00 | 12.07 | 22.10 | 28.87 | 36.70 | a | 42.60 | 48.77 | 50.19 | 42.60 | 34.30 | a | 19.34 | a | 16.38 | b | 30.91 | |||||||||
2015 | 21.10 | k | 26.11 | s | 33.25 | s | ----- | z | 39.11 | l | 50.57 | ----- | z | ----- | z | ----- | z | 40.39 | h | 21.07 | 16.23 | a | 29.29 | i | ||
2016 | 17.68 | 20.83 | e | 23.07 | c | 30.53 | ----- | z | 48.20 | 54.26 | 48.00 | 41.20 | 36.00 | a | 25.83 | 12.42 | 32.55 | a | ||||||||
2017 | 15.16 | 18.19 | a | 25.71 | 29.40 | e | 36.10 | 44.60 | 52.45 | 48.77 | 43.30 | 29.52 | 26.90 | 18.13 | a | 32.35 | ||||||||||
2018 | 18.87 | 12.32 | 22.68 | 26.50 | 40.16 | 46.67 | 51.61 | 50.16 | 44.03 | 30.70 | a | 19.83 | a | 17.00 | 31.71 | |||||||||||
2019 | 19.29 | 12.46 | 18.77 | 29.93 | 33.77 | 44.30 | 52.81 | 51.03 | ----- | z | 22.81 | ----- | z | ----- | z | 31.69 | c | |||||||||
2020 | ----- | z | ----- | z | 23.24 | b | 25.23 | 37.90 | ----- | z | ----- | z | 53.39 | 41.77 | 30.52 | 25.07 | ----- | z | 33.87 | e | ||||||
2021 | 17.52 | 8.61 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.06 | 44.66 | a | 35.13 | a | 28.73 | d | 21.10 | b | 29.54 | e | |||
2022 | 17.11 | c | 10.62 | b | 21.35 | 24.27 | 36.16 | 47.77 | 55.13 | 52.90 | ----- | z | 32.97 | 16.33 | 16.70 | a | 30.12 | a | ||||||||
2023 | 15.77 | 16.56 | a | 17.84 | 26.23 | 41.23 | a | 46.17 | ----- | z | ----- | z | ----- | z | ----- | z | 24.37 | ----- | z | 26.88 | e | |||||
2024 | 11.23 | 21.33 | b | 23.06 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.54 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.98 | 15.84 | 21.92 | 27.99 | 37.12 | 45.34 | 52.93 | 50.89 | 42.39 | 31.14 | 22.86 | 16.11 | 31.79 | |||||||||||||
S.D. | 3.00 | 3.78 | 2.87 | 2.51 | 1.91 | 2.60 | 1.88 | 2.06 | 2.37 | 3.05 | 3.35 | 2.86 | 0.78 | |||||||||||||
SKEW | -0.38 | 0.19 | -0.45 | -0.44 | 0.15 | 0.10 | -0.19 | -0.45 | -0.36 | -1.17 | -0.22 | -0.22 | 0.34 | |||||||||||||
MAX | 22.80 | 22.62 | 27.74 | 32.97 | 41.23 | 50.57 | 56.29 | 54.55 | 46.90 | 36.00 | 28.73 | 21.10 | 33.76 | |||||||||||||
MIN | 10.47 | 8.61 | 15.03 | 22.45 | 33.77 | 39.97 | 48.77 | 46.06 | 37.37 | 22.81 | 15.43 | 10.65 | 30.50 | |||||||||||||
YRS | 28 | 28 | 28 | 27 | 26 | 27 | 24 | 27 | 25 | 27 | 28 | 27 | 21 |