YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1985 | ----- | z | -6.15 | h | 10.69 | b | 21.69 | a | 29.83 | h | 34.04 | c | 42.19 | 36.90 | 30.50 | 23.95 | j | 10.65 | j | 3.26 | l | 29.34 | f | |||
1986 | 3.89 | c | 15.36 | 18.10 | a | 24.23 | h | 26.65 | k | 35.90 | 40.16 | 39.48 | 32.57 | 23.08 | g | 14.00 | k | -0.41 | n | 26.49 | e | |||||
1987 | -0.20 | k | 5.53 | m | 9.41 | i | 17.56 | n | ----- | z | 34.30 | 37.23 | 38.48 | 27.33 | 23.90 | j | 8.21 | p | 4.63 | l | 34.34 | h | ||||
1988 | -1.11 | l | 1.65 | l | 10.38 | j | 21.06 | m | 27.38 | o | 36.34 | a | ----- | z | 40.00 | 29.43 | 25.81 | o | 15.80 | o | 0.50 | g | 35.26 | i | ||
1989 | -4.04 | f | 4.25 | d | 18.68 | 24.32 | h | 28.05 | k | 31.73 | 39.52 | 38.90 | 31.00 | 20.12 | f | 14.86 | b | 4.52 | d | 22.93 | d | |||||
1990 | 0.89 | d | 6.83 | d | 18.91 | h | 26.61 | b | 28.43 | c | 34.80 | 40.43 | a | 37.39 | 34.54 | d | 23.23 | ----- | z | ----- | z | 25.90 | c | |||
1991 | ----- | z | ----- | z | ----- | z | 20.09 | h | 27.92 | e | 35.73 | 39.65 | 39.90 | a | 32.72 | a | 21.35 | h | 16.35 | d | 3.29 | g | 32.05 | f | ||
1992 | 3.00 | a | 8.71 | a | 19.28 | b | 27.85 | d | 33.58 | e | 34.55 | a | 37.47 | a | 37.19 | 32.69 | d | 23.35 | k | 6.80 | o | 5.38 | b | 23.97 | b | |
1993 | 6.79 | b | 10.58 | b | 16.37 | a | 21.83 | a | 32.84 | 35.62 | d | 38.79 | b | 40.15 | d | 31.36 | e | 25.50 | c | 7.26 | c | 5.07 | c | 22.68 | ||
1994 | 5.84 | 7.48 | c | 17.10 | b | 24.62 | a | 32.16 | 37.19 | d | 39.97 | b | 41.59 | d | 33.90 | 26.86 | c | 12.44 | c | 7.07 | d | 23.85 | ||||
1995 | 7.14 | b | 14.00 | b | 16.34 | b | 21.57 | 29.68 | f | 34.38 | d | 39.00 | c | 41.74 | d | 34.83 | g | 21.91 | h | 17.61 | b | 6.70 | a | 22.05 | c | |
1996 | 4.62 | b | 8.14 | a | 13.79 | b | 22.03 | a | 32.17 | b | 35.52 | a | 40.56 | f | 39.30 | k | 32.48 | e | 22.96 | f | 15.08 | d | 7.64 | c | 19.05 | c |
1997 | 4.23 | 3.43 | 14.19 | 20.93 | c | 30.79 | b | 36.72 | e | 40.25 | k | 40.41 | b | 37.14 | a | 24.54 | e | 15.03 | a | 5.04 | c | 21.13 | a | |||
1998 | 7.78 | d | 11.92 | b | 15.45 | b | 24.13 | 30.70 | a | 33.66 | a | 44.07 | d | 41.10 | 36.38 | a | 26.10 | a | 19.41 | a | 8.27 | a | 24.91 | |||
1999 | 11.69 | b | 11.38 | b | 20.13 | 23.45 | a | 29.68 | 35.40 | 43.10 | b | 41.97 | a | 32.10 | a | 22.19 | 16.14 | a | 8.52 | b | 24.65 | |||||
2000 | 12.57 | a | 14.39 | a | 19.14 | b | 26.76 | a | 32.67 | a | 35.39 | b | 41.67 | a | 43.45 | 34.14 | a | 27.00 | 8.34 | a | 6.61 | 25.18 | ||||
2001 | 4.00 | b | 11.88 | d | 20.83 | b | 26.40 | 32.16 | 34.96 | d | 44.14 | c | 41.43 | a | 34.69 | a | 26.37 | a | 18.55 | a | 5.26 | 25.06 | ||||
2002 | 3.90 | a | 2.23 | b | 12.32 | c | 27.00 | 29.42 | e | 36.86 | a | 42.61 | 38.93 | b | 34.71 | b | 24.23 | a | 11.79 | b | 8.77 | a | 22.73 | |||
2003 | 13.90 | a | 8.72 | c | 16.97 | a | 23.55 | a | 31.42 | 34.65 | d | 41.62 | b | 43.27 | a | 31.59 | a | 27.77 | a | 17.17 | a | 9.97 | a | 25.05 | ||
2004 | 5.97 | b | 8.73 | c | 19.79 | c | 27.53 | 30.68 | 35.37 | 40.19 | 37.14 | c | 33.59 | a | 27.73 | a | 18.93 | a | 7.03 | b | 24.39 | |||||
2005 | 12.71 | 10.46 | b | 17.48 | 24.03 | a | 30.55 | 34.41 | c | 40.90 | 40.03 | b | 33.75 | b | 28.38 | b | ----- | z | ----- | z | 27.27 | b | ||||
2006 | ----- | z | ----- | z | 11.45 | t | 23.10 | t | ----- | z | 36.34 | a | 44.94 | 42.81 | 30.59 | a | 25.40 | a | 14.21 | a | 8.50 | a | 28.97 | e | ||
2007 | 2.03 | a | 10.58 | d | 18.17 | a | 25.52 | a | 31.62 | b | 35.97 | 44.84 | 45.16 | 35.21 | b | 24.77 | 14.90 | 6.27 | a | 24.59 | ||||||
2008 | 1.24 | b | 8.36 | a | 9.03 | 16.39 | b | 29.41 | b | 33.68 | b | 41.63 | d | 41.34 | b | 32.93 | 24.00 | b | 18.83 | f | 8.60 | a | 22.42 | a | ||
2009 | 7.81 | 12.00 | a | 15.86 | b | 20.57 | b | 33.69 | b | 36.58 | d | 40.32 | c | 37.93 | c | 35.11 | b | 25.08 | f | 15.57 | b | 1.96 | c | 23.40 | a | |
2010 | 5.60 | a | 6.36 | 12.53 | a | 23.45 | a | 28.97 | 36.00 | a | 42.94 | 40.85 | d | 32.23 | 27.13 | 12.83 | 12.00 | d | 23.41 | |||||||
2011 | 4.87 | a | 3.25 | 16.03 | b | 22.79 | a | 28.42 | 33.72 | a | 44.61 | 41.68 | 34.63 | 26.23 | 13.73 | 5.32 | 22.94 | |||||||||
2012 | 4.84 | 6.69 | 16.68 | 25.23 | 30.21 | b | ----- | z | 44.52 | 42.48 | 33.63 | 25.03 | 17.20 | 8.23 | 23.16 | a | ||||||||||
2013 | 1.68 | 6.04 | 13.61 | 22.13 | 30.55 | 36.23 | 43.94 | 42.03 | 38.30 | 24.00 | 15.30 | 5.87 | 23.31 | |||||||||||||
2014 | 5.90 | 13.96 | 14.71 | 23.43 | 30.29 | 35.80 | 43.13 | 40.90 | 37.00 | 28.03 | 14.73 | 12.65 | 25.05 | |||||||||||||
2015 | 11.52 | 14.75 | 17.58 | 24.10 | 31.45 | 39.80 | 42.00 | 41.23 | 35.23 | 29.52 | 12.70 | 6.65 | 25.54 | |||||||||||||
2016 | 6.38 | b | 7.41 | 16.35 | 25.07 | 30.48 | 38.50 | 41.81 | 39.97 | 33.33 | 27.55 | 18.90 | 8.48 | 24.52 | ||||||||||||
2017 | 7.65 | 19.04 | 21.81 | 25.30 | 30.06 | 36.10 | 43.00 | 39.32 | 34.53 | 23.42 | 20.73 | 10.16 | 25.93 | |||||||||||||
2018 | 8.23 | 13.14 | 17.45 | 24.87 | 31.17 | a | 36.34 | a | 41.81 | 39.55 | 33.13 | 28.35 | 10.97 | 8.33 | a | 24.45 | ||||||||||
2019 | 7.16 | 9.11 | 23.87 | 30.43 | 29.81 | 34.03 | 41.48 | 40.03 | 35.60 | 18.81 | 14.17 | 6.97 | 24.29 | |||||||||||||
2020 | 9.35 | 7.14 | 20.07 | a | 22.93 | b | 31.74 | 35.50 | 36.70 | a | 41.48 | 31.90 | a | 21.13 | a | 16.13 | 5.77 | a | 23.32 | |||||||
2021 | 9.61 | 13.00 | a | 16.00 | a | 21.88 | e | 30.97 | 37.44 | e | 44.96 | d | 39.37 | a | 32.81 | c | 25.90 | 19.70 | c | 10.61 | 25.19 | |||||
2022 | 3.58 | 3.00 | 11.70 | d | 22.22 | c | 30.39 | 36.17 | 44.87 | a | 43.90 | 36.67 | 24.38 | e | 9.59 | h | 6.48 | b | 23.94 | a | ||||||
2023 | 9.55 | 4.31 | b | 11.74 | 20.67 | c | 32.67 | a | 35.97 | 41.19 | 42.84 | 33.23 | 25.13 | 15.50 | 10.97 | 23.65 | ||||||||||
2024 | 8.74 | 9.72 | 10.36 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9.23 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 6.61 | 9.32 | 16.47 | 23.85 | 30.85 | 35.57 | 41.71 | 40.59 | 33.49 | 25.47 | 15.21 | 7.49 | 24.30 | |||||||||||||
S.D. | 3.40 | 4.01 | 3.31 | 2.68 | 1.46 | 1.45 | 2.28 | 1.97 | 2.23 | 2.36 | 3.15 | 2.31 | 0.94 | |||||||||||||
SKEW | 0.35 | 0.18 | -0.15 | -0.09 | 0.02 | 0.24 | -0.36 | 0.03 | -0.26 | -0.74 | -0.55 | 0.20 | -0.27 | |||||||||||||
MAX | 13.90 | 19.04 | 23.87 | 30.43 | 33.69 | 39.80 | 44.96 | 45.16 | 38.30 | 29.52 | 20.73 | 12.65 | 25.93 | |||||||||||||
MIN | 0.89 | 2.23 | 9.03 | 16.39 | 27.92 | 31.73 | 36.70 | 36.90 | 27.33 | 18.81 | 7.26 | 1.96 | 22.68 | |||||||||||||
YRS | 34 | 35 | 34 | 33 | 32 | 38 | 36 | 38 | 38 | 29 | 30 | 32 | 22 |