YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.35 | 36.13 | 30.07 | a | 26.60 | 21.20 | a | 30.47 | g | |||
1981 | 25.71 | 22.68 | 27.00 | 28.80 | 32.86 | b | 38.20 | 39.42 | 41.50 | a | 36.10 | 28.65 | 28.13 | 27.74 | 31.40 | |||||||||||
1982 | 13.24 | b | 18.22 | a | 26.10 | a | 25.93 | a | 30.37 | a | 40.34 | a | 42.37 | a | 41.03 | b | 35.29 | b | 31.24 | b | 22.85 | d | 21.03 | a | 29.00 | |
1983 | 25.04 | c | 27.27 | b | 30.90 | 29.00 | 33.32 | 36.43 | 38.52 | b | 43.07 | a | 34.03 | 30.20 | a | 29.07 | b | 20.56 | f | 32.44 | a | |||||
1984 | 16.69 | b | 20.04 | a | 27.97 | 28.79 | b | 33.77 | 36.23 | 42.77 | 41.58 | 34.17 | a | 28.35 | 27.20 | 11.68 | c | 29.10 | ||||||||
1985 | 9.20 | a | 15.61 | 19.61 | ----- | z | 31.81 | 38.79 | b | 45.52 | 40.39 | 34.00 | 28.20 | a | 15.57 | 14.50 | a | 26.65 | a | |||||||
1986 | 25.71 | 28.86 | 29.10 | a | 28.03 | 31.53 | a | 41.21 | a | 39.47 | a | 44.39 | 34.83 | 29.70 | a | 26.41 | a | 23.26 | 31.87 | |||||||
1987 | 15.60 | a | 23.54 | 26.48 | 29.50 | b | 36.27 | a | 41.35 | d | 42.29 | c | 41.46 | c | 37.39 | b | 31.70 | a | 25.32 | b | 19.03 | a | 30.83 | |||
1988 | 12.19 | 18.37 | b | 24.06 | 30.82 | b | 31.66 | b | 40.15 | d | 44.10 | 40.11 | c | 35.33 | 32.17 | a | 26.17 | a | 16.42 | 29.30 | ||||||
1989 | 12.57 | a | 9.78 | a | 27.03 | a | 31.47 | 32.62 | b | 40.82 | b | 42.64 | c | 41.07 | a | 36.07 | a | 28.94 | 22.25 | b | 19.53 | a | 28.73 | |||
1990 | 23.55 | 15.56 | a | 23.28 | b | 31.28 | a | 31.26 | 38.41 | a | 45.11 | d | 45.28 | b | 38.86 | b | 26.87 | a | 22.93 | b | 10.00 | 29.36 | ||||
1991 | 19.29 | 27.79 | d | 24.76 | b | 27.29 | b | 30.93 | b | 35.52 | a | 45.38 | b | 44.06 | 37.68 | b | 30.84 | 27.60 | 21.83 | b | 31.08 | |||||
1992 | 15.90 | b | 27.38 | 27.63 | a | 32.36 | b | 36.73 | a | 41.61 | b | 44.66 | b | 43.80 | a | 36.28 | a | 30.50 | a | 23.43 | b | 15.87 | 31.34 | |||
1993 | 8.20 | a | 13.11 | 28.73 | a | 30.30 | c | 36.38 | b | 34.88 | f | 36.85 | d | 41.55 | b | 36.14 | b | 31.76 | b | 16.76 | a | 21.80 | a | 27.42 | a | |
1994 | 21.69 | b | 21.82 | 25.64 | c | 29.96 | b | 34.76 | f | 37.56 | e | 43.37 | d | 40.37 | a | 37.57 | b | 26.48 | b | 15.21 | a | 15.71 | 28.67 | a | ||
1995 | 27.55 | 25.79 | d | 27.32 | c | 27.25 | b | 35.06 | 38.68 | b | 43.52 | b | 38.97 | b | 38.07 | 27.32 | 31.40 | 26.32 | 32.27 | |||||||
1996 | 23.06 | 23.62 | 26.32 | 29.73 | 32.27 | a | 37.47 | 45.16 | 41.29 | 34.17 | 29.10 | 28.55 | a | 25.97 | 31.39 | |||||||||||
1997 | 19.24 | b | 24.11 | 26.97 | 28.00 | 33.35 | 36.93 | c | 42.31 | b | 44.36 | c | 37.37 | 29.93 | a | 28.43 | 17.61 | 30.72 | ||||||||
1998 | 27.03 | a | 26.26 | a | 25.90 | a | 26.93 | a | 33.21 | b | 37.87 | 46.53 | a | 42.77 | 38.24 | a | 27.61 | c | 27.73 | 17.84 | 31.49 | |||||
1999 | 19.65 | 18.26 | a | 21.16 | 26.69 | a | 30.45 | 36.07 | a | 40.26 | 43.52 | 34.80 | 26.81 | 29.73 | 21.45 | b | 29.07 | |||||||||
2000 | 24.16 | 27.90 | 25.10 | 30.53 | 35.29 | 40.27 | 43.46 | c | 41.89 | c | 35.56 | c | 29.33 | d | 19.59 | c | 19.90 | a | 31.08 | |||||||
2001 | 17.97 | b | 20.11 | 27.62 | b | 26.04 | b | 36.13 | 36.66 | a | 42.57 | a | 43.45 | b | 37.11 | b | 29.48 | 27.03 | 22.97 | b | 30.59 | |||||
2002 | 19.52 | 19.93 | 23.67 | a | 30.27 | 33.21 | c | 40.07 | c | 45.40 | a | 39.47 | a | 35.38 | a | 24.60 | a | 24.07 | a | 24.97 | a | 30.05 | ||||
2003 | 27.13 | 23.18 | 28.34 | b | 29.33 | 34.32 | 39.29 | b | 46.35 | 44.03 | a | 37.28 | a | 30.55 | 24.03 | 25.39 | c | 32.44 | ||||||||
2004 | 23.27 | a | 22.62 | 28.31 | b | 29.45 | a | 32.29 | c | 39.71 | i | ----- | z | 47.20 | a | 31.29 | f | 27.55 | b | 16.67 | 24.71 | c | 28.01 | c | ||
2005 | 18.92 | f | 18.29 | d | 28.21 | b | 29.76 | a | 37.93 | d | 33.70 | 39.83 | b | 37.23 | e | 27.97 | a | 23.28 | b | 23.15 | d | 9.87 | h | 29.93 | b | |
2006 | 16.21 | b | 9.81 | b | 13.29 | 28.90 | a | 31.77 | a | 36.93 | c | 42.33 | a | 36.32 | 29.59 | c | 22.19 | e | 15.75 | v | 12.04 | f | 26.73 | b | ||
2007 | 5.38 | e | 19.84 | c | 21.77 | e | 24.45 | h | 29.86 | b | 32.93 | 44.05 | k | 37.07 | q | 26.84 | e | 27.35 | h | 20.50 | 13.67 | a | 21.35 | d | ||
2008 | 12.29 | n | ----- | z | ----- | z | 22.25 | r | 29.82 | i | 30.55 | s | ----- | z | ----- | z | ----- | z | 28.48 | 28.23 | 17.65 | 24.79 | i | |||
2009 | 17.71 | 21.46 | 22.90 | 26.90 | 34.48 | 40.17 | a | 41.84 | 39.96 | c | 34.50 | b | 26.40 | a | 21.62 | a | 14.19 | 28.51 | ||||||||
2010 | 27.16 | 25.00 | 23.90 | 25.55 | a | 29.80 | a | 38.75 | b | 41.20 | a | 37.65 | 33.57 | 30.61 | 23.45 | a | 23.94 | 30.05 | ||||||||
2011 | 15.03 | 19.96 | a | 29.35 | 26.83 | 29.71 | 36.41 | a | 40.58 | 39.87 | 35.20 | 28.29 | 22.73 | 14.00 | 28.17 | |||||||||||
2012 | 19.90 | 19.41 | 23.10 | 32.13 | 33.35 | 37.17 | 45.18 | t | 45.12 | w | 33.90 | 29.00 | 26.77 | 18.77 | 27.35 | b | ||||||||||
2013 | 8.00 | 14.25 | 23.61 | 28.69 | a | 37.07 | c | 40.57 | 46.63 | a | 42.27 | a | 37.25 | b | 23.32 | 21.00 | a | 8.63 | a | 27.61 | ||||||
2014 | 18.16 | 25.21 | 28.07 | a | 29.17 | a | 35.83 | b | 37.46 | b | 43.84 | 41.84 | 35.97 | a | 32.03 | 25.17 | a | 29.16 | 31.83 | |||||||
2015 | 22.10 | 29.21 | 24.33 | a | 22.36 | b | 34.55 | 41.63 | 43.58 | 40.39 | 30.80 | 30.76 | b | 19.23 | 18.03 | 29.75 | ||||||||||
2016 | 17.00 | a | 17.82 | a | 29.61 | 33.13 | 33.67 | a | 38.33 | 40.87 | 40.03 | 31.93 | a | 32.80 | a | 28.41 | a | 10.06 | 29.47 | |||||||
2017 | 7.06 | 22.32 | c | 26.19 | 28.93 | a | 34.94 | 41.48 | a | 44.61 | 43.87 | 38.27 | 26.80 | a | 27.90 | 17.61 | 30.00 | |||||||||
2018 | 26.65 | 19.50 | 23.97 | a | 30.80 | 36.29 | 37.00 | 42.42 | 40.29 | 31.30 | 28.55 | 22.10 | 18.97 | a | 29.82 | |||||||||||
2019 | 21.32 | 20.48 | a | 20.77 | 31.93 | 33.65 | 36.20 | 40.94 | 42.10 | 35.83 | ----- | z | 21.63 | 23.00 | 29.81 | a | ||||||||||
2020 | ----- | z | 21.07 | 24.13 | 28.00 | 34.90 | ----- | z | 40.35 | 42.52 | 35.07 | 25.52 | 20.20 | 16.16 | 28.79 | b | ||||||||||
2021 | 21.39 | 20.68 | 20.03 | 22.17 | 29.06 | 39.33 | 42.94 | 38.68 | 31.80 | 27.71 | 24.10 | ----- | z | 28.90 | a | |||||||||||
2022 | 14.39 | 12.75 | 23.65 | 23.77 | 28.74 | 36.50 | 43.10 | 41.61 | 35.10 | 24.32 | 15.57 | 13.69 | e | 26.10 | ||||||||||||
2023 | 12.94 | 11.04 | 13.45 | 22.90 | 32.23 | 34.93 | 39.29 | 40.33 | a | 31.87 | 24.94 | 20.63 | 21.71 | 25.52 | ||||||||||||
2024 | 23.94 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.94 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.72 | 20.71 | 24.98 | 28.49 | 33.24 | 38.19 | 42.62 | 41.46 | 34.87 | 28.40 | 23.84 | 19.15 | 29.93 | |||||||||||||
S.D. | 6.09 | 5.07 | 3.77 | 2.66 | 2.36 | 2.21 | 2.35 | 2.27 | 2.73 | 2.59 | 4.18 | 5.05 | 1.68 | |||||||||||||
SKEW | -0.41 | -0.38 | -1.31 | -0.68 | -0.02 | -0.22 | -0.28 | 0.04 | -1.08 | -0.52 | -0.42 | -0.12 | -0.79 | |||||||||||||
MAX | 27.55 | 29.21 | 30.90 | 33.13 | 37.93 | 41.63 | 46.63 | 47.20 | 38.86 | 32.80 | 31.40 | 29.16 | 32.44 | |||||||||||||
MIN | 5.38 | 9.78 | 13.29 | 22.17 | 28.74 | 32.93 | 36.85 | 36.32 | 26.84 | 22.19 | 15.21 | 8.63 | 25.52 | |||||||||||||
YRS | 41 | 42 | 42 | 40 | 41 | 39 | 39 | 41 | 42 | 42 | 43 | 40 | 30 |