YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.58 | x | 51.78 | b | 48.66 | b | 44.27 | 32.26 | 23.38 | 16.58 | a | 36.15 | f | |||
1977 | 13.08 | 17.73 | 17.94 | 32.78 | 40.50 | 51.45 | 54.55 | 53.07 | a | 47.23 | 36.85 | 25.42 | 19.18 | a | 34.15 | |||||||||||
1978 | 15.40 | 16.02 | a | 25.39 | 32.52 | 37.56 | 49.88 | 54.16 | 50.84 | b | 46.02 | 37.22 | a | 24.35 | 12.28 | b | 33.47 | |||||||||
1979 | 9.71 | e | 15.79 | 21.18 | ----- | z | ----- | z | 47.90 | f | ----- | z | ----- | z | ----- | z | ----- | z | 14.12 | m | 20.75 | s | 15.56 | i | ||
1980 | ----- | z | ----- | z | ----- | z | 23.47 | l | 38.71 | j | ----- | z | ----- | z | 51.53 | p | ----- | z | 37.53 | p | 32.29 | r | ----- | z | ----- | z |
1981 | 20.21 | n | ----- | z | ----- | z | 37.13 | k | 40.32 | l | 52.33 | o | 54.90 | u | 53.19 | r | 47.53 | l | 37.69 | 30.42 | 21.67 | a | 29.93 | i | ||
1982 | 16.95 | a | 19.50 | 25.79 | 29.73 | 39.87 | a | ----- | z | ----- | z | 54.40 | 46.21 | b | 33.42 | a | 22.69 | a | 18.30 | c | 30.69 | b | ||||
1983 | 19.91 | b | 19.70 | 23.39 | c | 24.16 | b | 36.11 | 46.57 | 54.88 | a | 54.56 | g | 48.69 | a | 38.03 | a | 25.66 | a | 15.78 | a | 32.08 | a | |||
1984 | 13.92 | a | 16.88 | a | 21.77 | a | 25.72 | c | 41.48 | d | 47.48 | c | 54.77 | a | 52.97 | 47.02 | c | 30.90 | g | 23.73 | f | 18.28 | b | 34.03 | b | |
1985 | 14.12 | a | 14.06 | a | 23.23 | e | 32.68 | b | 40.72 | b | 49.97 | a | 54.05 | a | 53.13 | a | 43.68 | e | 36.55 | c | 23.29 | a | 16.84 | b | 33.53 | |
1986 | 22.08 | a | 20.16 | 26.90 | a | 31.88 | a | 40.50 | c | 50.14 | b | 52.86 | c | 53.27 | c | 44.27 | b | 35.37 | d | 25.24 | a | 17.38 | b | 35.00 | ||
1987 | 16.26 | b | 19.29 | b | 21.73 | e | 33.12 | b | 41.64 | c | 50.15 | 53.50 | b | 51.85 | a | 45.45 | a | 39.41 | c | 25.28 | c | 14.85 | e | 34.38 | ||
1988 | 13.57 | d | 18.97 | 19.90 | g | 33.07 | c | 41.08 | e | 52.39 | c | 54.48 | 54.20 | d | 44.52 | a | 40.69 | b | 23.64 | b | 15.10 | 35.61 | a | |||
1989 | 16.62 | c | 17.57 | a | 28.95 | 34.41 | c | 43.37 | d | 47.78 | c | 55.55 | 51.50 | 46.50 | c | 35.67 | d | 26.67 | d | 16.32 | 35.08 | |||||
1990 | 16.52 | a | 19.62 | 26.39 | 34.12 | 39.19 | 52.22 | 53.87 | a | 51.79 | 49.60 | a | 36.90 | 26.65 | 14.09 | b | 35.08 | |||||||||
1991 | 14.73 | 21.63 | a | 21.55 | c | 29.10 | 41.68 | a | 49.77 | 53.37 | a | 52.98 | 46.57 | a | 38.06 | 23.09 | a | 17.58 | 34.18 | |||||||
1992 | 17.24 | 20.22 | 26.48 | 36.32 | 43.58 | 48.20 | 51.92 | a | 51.00 | b | 46.55 | b | 40.11 | d | 18.12 | a | 16.25 | c | 34.67 | |||||||
1993 | 18.23 | e | 18.04 | b | 26.12 | a | 29.83 | c | 40.55 | c | 48.89 | b | 53.17 | b | 52.25 | c | 44.92 | d | 35.45 | b | 18.84 | e | 16.92 | a | 33.60 | |
1994 | 15.78 | d | 17.69 | a | 26.81 | e | 31.92 | d | 43.18 | c | 53.59 | b | 54.45 | b | 54.67 | b | 46.98 | d | 36.12 | b | 22.22 | c | 19.85 | e | 35.27 | |
1995 | 15.84 | c | 24.46 | b | 24.31 | g | 28.68 | e | 36.91 | b | 46.55 | b | 52.27 | a | 55.92 | e | 46.21 | b | 36.30 | c | 29.14 | a | 18.89 | c | 35.56 | a |
1996 | 17.50 | f | 21.22 | b | 23.38 | b | 32.24 | e | 45.33 | e | 49.67 | f | 55.94 | m | 54.05 | b | 44.92 | d | 36.10 | e | 27.57 | h | 19.33 | g | 36.75 | e |
1997 | 17.02 | f | 16.55 | 27.37 | 26.98 | 41.29 | 49.97 | a | 54.31 | 53.21 | 49.75 | d | 34.32 | n | 21.42 | d | 16.32 | a | 35.72 | b | ||||||
1998 | 18.52 | a | 17.07 | a | 24.00 | 28.87 | 43.48 | b | 47.94 | c | 57.56 | d | 53.61 | 50.80 | b | 37.78 | b | 29.53 | 21.58 | 35.90 | ||||||
1999 | 19.96 | c | 21.96 | b | 29.33 | a | 29.57 | 39.97 | a | 49.40 | e | 56.50 | b | 54.40 | a | 45.93 | 38.95 | b | 31.84 | a | 18.19 | 36.33 | ||||
2000 | 19.69 | 23.95 | a | 25.68 | a | 37.02 | 45.37 | d | 52.25 | 56.52 | a | 55.85 | e | 49.11 | b | 38.93 | b | 18.72 | a | 18.35 | 36.79 | |||||
2001 | 16.25 | a | 21.23 | 26.16 | b | 34.93 | b | 43.80 | a | 52.50 | 56.97 | a | 54.30 | a | 47.75 | b | 39.26 | b | 27.86 | b | 17.60 | a | 36.55 | |||
2002 | 18.00 | a | 17.80 | c | 21.93 | d | 38.57 | 42.40 | a | 53.88 | 58.16 | b | 54.63 | 46.85 | c | 35.31 | b | 24.86 | b | 17.69 | 35.84 | |||||
2003 | 24.32 | 17.39 | a | 25.67 | b | 33.30 | c | 42.85 | a | 49.39 | b | 58.76 | 55.77 | 46.91 | a | 43.50 | 25.13 | 21.40 | a | 37.03 | ||||||
2004 | 18.83 | a | 17.60 | 30.67 | b | 34.47 | 43.35 | 49.76 | a | 54.53 | b | 52.38 | a | 46.48 | c | 38.32 | a | 26.22 | 19.85 | a | 36.04 | |||||
2005 | 23.37 | 20.71 | 23.32 | a | 34.97 | a | 43.87 | a | 49.57 | a | 57.32 | a | 53.15 | a | 49.73 | b | 39.20 | a | 27.84 | b | 17.87 | 36.74 | ||||
2006 | 19.27 | 18.48 | b | 24.47 | b | 36.95 | a | 44.33 | b | 53.22 | 56.79 | 53.58 | 42.25 | 35.98 | a | 26.72 | 20.27 | 36.03 | ||||||||
2007 | 17.52 | 22.33 | b | 30.05 | a | 35.28 | a | 41.90 | a | 51.67 | a | 57.40 | 55.94 | 48.62 | 39.63 | 30.64 | a | 15.67 | a | 37.22 | ||||||
2008 | 12.64 | b | 19.02 | a | 19.76 | h | 29.55 | 40.12 | a | 50.60 | 56.30 | a | 54.06 | 46.57 | 38.85 | 29.33 | 18.57 | c | 35.96 | a | ||||||
2009 | 18.77 | 18.82 | 24.98 | 29.72 | 44.08 | a | 47.93 | 54.63 | 52.61 | 45.77 | 32.03 | 28.00 | 11.29 | 34.05 | ||||||||||||
2010 | 17.48 | 12.70 | 21.79 | 30.02 | 39.89 | 52.22 | 56.58 | 53.92 | 49.27 | 38.15 | 22.05 | 22.10 | 34.68 | |||||||||||||
2011 | 14.48 | 13.91 | 25.10 | 29.13 | 37.81 | 50.17 | 57.29 | 55.66 | 46.50 | 36.06 | 24.23 | 16.68 | 33.92 | |||||||||||||
2012 | 19.48 | 14.89 | a | 28.42 | 36.22 | 42.90 | 53.78 | 57.02 | 54.18 | 46.80 | 37.23 | 29.47 | 15.89 | 36.36 | ||||||||||||
2013 | 14.53 | 12.88 | 22.53 | 27.50 | 39.31 | 52.43 | 56.06 | 53.94 | 48.75 | 34.03 | 25.03 | 15.39 | 33.53 | |||||||||||||
2014 | 16.85 | 19.50 | 22.76 | 28.82 | 39.58 | 49.63 | 56.19 | 51.63 | 48.88 | 39.27 | 24.19 | a | 17.92 | 34.60 | ||||||||||||
2015 | 21.87 | 21.70 | 27.79 | b | 31.24 | a | 39.16 | 52.68 | 53.55 | 54.45 | 49.22 | 40.76 | 22.97 | 15.63 | 35.92 | |||||||||||
2016 | 16.13 | 22.16 | 24.79 | 31.12 | 39.24 | 53.63 | 55.98 | 51.18 | 47.05 | 40.18 | 29.25 | 17.84 | 35.71 | |||||||||||||
2017 | 16.27 | 23.75 | 30.65 | 31.07 | 39.89 | 52.57 | 56.24 | 51.76 | 47.95 | 37.06 | 32.13 | 21.85 | 36.77 | |||||||||||||
2018 | 21.48 | 18.36 | 25.26 | 33.27 | 44.00 | a | 52.78 | 57.24 | 53.81 | 48.92 | 35.53 | 20.40 | 15.26 | 35.53 | ||||||||||||
2019 | 17.00 | 15.48 | 22.52 | 32.88 | a | 35.02 | 48.32 | 55.39 | 55.08 | 50.10 | 31.37 | 26.13 | 16.58 | 33.82 | ||||||||||||
2020 | 16.40 | 16.24 | 24.81 | 31.07 | 43.11 | 50.50 | 54.92 | 55.92 | 46.18 | 39.19 | 26.38 | 16.18 | 35.08 | |||||||||||||
2021 | 17.03 | 16.36 | 22.06 | 31.28 | 40.37 | 52.92 | 57.29 | 53.18 | 49.67 | 36.29 | 31.30 | 22.05 | 35.82 | |||||||||||||
2022 | 18.11 | 14.77 | 22.27 | 30.55 | 41.16 | 51.45 | 56.27 | 55.13 | 50.23 | 36.26 | 21.18 | 16.89 | 34.52 | |||||||||||||
2023 | 15.31 | 15.96 | 18.23 | 28.85 | 42.79 | 50.15 | 60.58 | 56.94 | 49.70 | 38.73 | 27.97 | 21.74 | 35.58 | |||||||||||||
2024 | 17.82 | 20.50 | 23.98 | 32.16 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.77 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.21 | 18.49 | 24.73 | 31.71 | 41.23 | 50.63 | 55.49 | 53.56 | 47.23 | 37.27 | 25.57 | 17.62 | 35.24 | |||||||||||||
S.D. | 2.88 | 2.88 | 2.97 | 3.12 | 2.40 | 2.05 | 1.90 | 1.68 | 1.98 | 2.45 | 3.54 | 2.51 | 1.11 | |||||||||||||
SKEW | 0.19 | 0.03 | 0.03 | -0.02 | -0.47 | -0.18 | 0.13 | -0.42 | -0.21 | -0.27 | -0.11 | 0.00 | -0.00 | |||||||||||||
MAX | 24.32 | 24.46 | 30.67 | 38.57 | 45.37 | 53.88 | 60.58 | 56.94 | 50.80 | 43.50 | 32.13 | 22.10 | 37.22 | |||||||||||||
MIN | 9.71 | 12.70 | 17.94 | 24.16 | 35.02 | 46.55 | 51.78 | 48.66 | 42.25 | 31.37 | 18.12 | 11.29 | 33.47 | |||||||||||||
YRS | 44 | 46 | 43 | 44 | 44 | 42 | 43 | 44 | 45 | 44 | 44 | 45 | 36 |