YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1988 | 14.14 | b | 20.63 | b | 20.00 | c | 30.96 | b | 38.20 | a | 48.43 | 52.39 | 52.19 | 42.83 | 35.41 | b | 24.63 | 17.31 | b | 33.09 | ||||||
1989 | 19.00 | a | 12.26 | a | 29.14 | b | ----- | z | 41.65 | 44.63 | ----- | z | 50.90 | ----- | z | 33.65 | 28.93 | 13.82 | c | 30.44 | c | |||||
1990 | 19.17 | b | 19.50 | 24.36 | c | 29.37 | 35.94 | 50.82 | b | 49.81 | 49.47 | a | 46.79 | a | 34.00 | a | 27.00 | a | 12.97 | b | 33.27 | |||||
1991 | 14.77 | a | 22.93 | 22.77 | a | 29.14 | b | 37.76 | b | 47.57 | 50.58 | 50.26 | 42.38 | a | 33.45 | 20.70 | 20.42 | 32.73 | ||||||||
1992 | 18.00 | 23.96 | b | 26.19 | 34.90 | a | 40.13 | 45.11 | c | 49.93 | b | 49.38 | b | 43.27 | 34.11 | d | 19.28 | a | 19.10 | 33.61 | ||||||
1993 | 19.14 | c | 17.31 | b | 24.75 | c | 27.79 | a | 38.30 | a | 45.77 | 50.60 | a | 50.63 | a | 40.27 | 30.79 | b | 19.62 | a | 19.38 | b | 32.03 | |||
1994 | 17.96 | e | 19.15 | b | 23.84 | 29.18 | b | 40.37 | a | 50.90 | a | 50.48 | 52.87 | 43.66 | a | 34.81 | 23.70 | c | 22.23 | a | 34.10 | |||||
1995 | 19.76 | b | 24.57 | 23.43 | a | 26.69 | a | 34.67 | a | 44.97 | 50.30 | a | 53.90 | 43.07 | a | 35.65 | 28.72 | a | 21.55 | 33.94 | ||||||
1996 | 18.16 | 21.14 | 20.80 | a | 31.17 | 42.67 | a | 46.66 | a | 52.94 | 50.58 | 42.86 | a | 34.29 | 27.97 | 21.45 | 34.22 | |||||||||
1997 | 16.26 | 16.85 | b | 25.94 | 24.10 | a | 37.64 | c | 47.29 | b | 51.17 | b | 51.19 | 47.80 | 34.97 | 22.17 | 14.83 | a | 32.52 | |||||||
1998 | 23.30 | a | 19.43 | 22.33 | a | 27.90 | a | 39.10 | a | 46.23 | 47.94 | 46.50 | a | 44.93 | a | 36.03 | 29.43 | 18.06 | 33.43 | |||||||
1999 | 24.87 | a | 24.74 | a | 27.07 | a | 27.27 | d | 33.68 | 43.17 | a | 53.00 | b | 52.42 | 41.00 | 33.65 | 29.62 | a | 18.74 | 34.10 | ||||||
2000 | 22.87 | 22.96 | a | 24.14 | b | 30.59 | a | 40.47 | a | 47.00 | a | 54.71 | 53.48 | 44.97 | 35.50 | c | 16.77 | 17.42 | 34.24 | |||||||
2001 | 15.45 | 22.71 | 23.21 | g | 32.82 | b | 39.21 | b | 47.70 | c | 54.17 | a | 51.33 | a | 43.62 | d | 34.04 | e | 31.62 | f | 16.15 | d | 35.72 | b | ||
2002 | 18.56 | d | 14.12 | b | 22.00 | a | 32.20 | 37.97 | b | 49.93 | c | 53.64 | f | 50.48 | 43.75 | b | 30.71 | c | 21.79 | b | 18.66 | b | 30.92 | a | ||
2003 | 24.72 | b | 16.69 | b | 23.50 | c | 30.97 | a | 39.14 | b | 44.07 | o | 54.52 | b | 52.00 | a | 41.62 | n | 38.00 | a | 25.92 | d | 20.26 | d | 32.57 | b |
2004 | 20.07 | c | 16.59 | b | 29.97 | a | 33.80 | o | 40.18 | c | 44.52 | a | 49.23 | a | 48.27 | a | 43.41 | a | 35.61 | 23.25 | b | 19.97 | a | 33.73 | a | |
2005 | 24.23 | 19.78 | a | 22.93 | a | 28.00 | c | 38.82 | c | 46.07 | c | 52.07 | a | 50.32 | 46.69 | d | 36.07 | a | 26.62 | a | 17.10 | 34.06 | ||||
2006 | 21.03 | a | 16.00 | a | 23.94 | 31.86 | b | 38.83 | a | 48.30 | 54.14 | c | 49.90 | a | 39.80 | 34.00 | 26.36 | b | 17.00 | a | 33.43 | |||||
2007 | 6.13 | h | 21.00 | c | 26.87 | 28.04 | d | 38.41 | b | 43.90 | a | 52.88 | e | 52.84 | 45.43 | b | 36.26 | d | 24.16 | e | 15.12 | e | 34.99 | a | ||
2008 | 12.08 | e | 20.21 | 23.97 | 29.70 | 36.61 | 45.93 | 52.35 | 50.42 | 42.63 | 36.45 | 26.97 | 18.77 | 33.01 | ||||||||||||
2009 | 21.20 | f | 24.50 | 26.68 | 28.80 | 40.97 | 44.87 | 50.39 | 49.58 | 45.00 | k | 28.61 | 28.97 | 12.23 | 33.56 | b | ||||||||||
2010 | 19.94 | 14.36 | 22.23 | 32.13 | 36.00 | 49.23 | 53.19 | 53.10 | 45.93 | 36.97 | 24.07 | 24.87 | 34.33 | |||||||||||||
2011 | 15.65 | 14.79 | 27.35 | 30.57 | 34.84 | 46.97 | 54.06 | 53.29 | 43.63 | 36.16 | 27.13 | 15.71 | 33.35 | |||||||||||||
2012 | 20.87 | a | 17.00 | 27.29 | c | 34.13 | 37.03 | a | 51.07 | 54.16 | 51.29 | 42.90 | 34.94 | 28.87 | 18.45 | 34.83 | ||||||||||
2013 | 15.35 | 15.27 | b | 21.84 | 24.07 | a | 36.61 | 48.07 | 51.61 | 52.55 | 50.37 | 33.73 | a | 26.33 | 15.58 | 32.62 | ||||||||||
2014 | 18.84 | 19.21 | 23.58 | 27.70 | 37.97 | 46.60 | 52.54 | g | ----- | z | 47.47 | 36.16 | 20.17 | 16.35 | 29.41 | b | ||||||||||
2015 | 18.55 | 19.18 | 22.70 | a | 29.53 | 36.77 | 47.57 | 51.42 | 50.87 | 46.73 | 37.06 | 22.33 | 17.45 | 33.35 | ||||||||||||
2016 | 15.13 | 19.52 | 22.65 | 28.30 | 35.42 | 47.66 | a | 51.35 | 48.39 | 43.67 | 35.16 | 26.50 | 17.27 | a | 32.58 | |||||||||||
2017 | 16.19 | 25.18 | 28.07 | a | 29.47 | 33.87 | 46.40 | 52.61 | 47.81 | 44.30 | 32.74 | 30.37 | 16.90 | a | 33.66 | |||||||||||
2018 | 20.06 | 17.36 | 22.74 | 27.50 | 41.00 | ----- | z | 52.92 | s | ----- | z | 47.03 | 36.03 | 24.40 | ----- | z | 29.52 | d | ||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.76 | 19.32 | 24.43 | 29.48 | 38.07 | 47.01 | 51.93 | 50.90 | 44.33 | 34.68 | 25.09 | 17.84 | 33.48 | |||||||||||||
S.D. | 3.26 | 3.51 | 2.48 | 2.55 | 2.29 | 2.07 | 1.79 | 1.82 | 2.39 | 1.99 | 3.54 | 2.79 | 0.71 | |||||||||||||
SKEW | 0.15 | 0.00 | 0.48 | -0.03 | -0.11 | 0.32 | -0.20 | -0.39 | 0.38 | -1.16 | -0.51 | 0.23 | -0.15 | |||||||||||||
MAX | 24.87 | 25.18 | 29.97 | 34.90 | 42.67 | 51.07 | 54.71 | 53.90 | 50.37 | 38.00 | 30.37 | 24.87 | 34.83 | |||||||||||||
MIN | 12.08 | 12.26 | 20.00 | 24.07 | 33.68 | 43.17 | 47.94 | 46.50 | 39.80 | 28.61 | 16.77 | 12.23 | 32.03 | |||||||||||||
YRS | 29 | 31 | 30 | 29 | 31 | 29 | 27 | 29 | 28 | 31 | 30 | 30 | 22 |