YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.62 | o | 40.77 | 30.37 | a | 19.53 | 10.79 | b | 25.36 | h | ||
1972 | 9.13 | a | 14.66 | 21.00 | a | 21.97 | 30.34 | b | 41.31 | a | 50.32 | 50.77 | 41.77 | 38.12 | g | 21.07 | 9.00 | j | 30.23 | b | ||||||
1973 | 1.94 | ----- | z | ----- | z | ----- | z | ----- | z | 38.35 | j | 47.29 | 47.74 | 38.03 | a | 27.79 | b | 14.31 | n | 9.34 | b | 28.69 | f | |||
1974 | 9.97 | 5.43 | 23.16 | 21.04 | d | 33.07 | p | 44.00 | 49.11 | d | 46.74 | 38.45 | a | 34.55 | b | 19.48 | a | 8.58 | 27.32 | a | ||||||
1975 | 1.65 | 5.43 | 17.00 | 22.18 | b | 26.60 | a | 38.32 | k | 48.61 | 46.42 | 40.74 | c | 26.45 | 16.34 | a | 11.72 | b | 23.92 | a | ||||||
1976 | 2.65 | h | 18.48 | 16.00 | a | 23.28 | a | 33.53 | n | 41.04 | b | 48.67 | a | 47.84 | 42.39 | b | 26.67 | a | 14.45 | a | 7.29 | c | 28.61 | b | ||
1977 | 2.77 | 10.77 | f | 17.63 | d | 27.83 | a | 33.43 | a | 45.67 | 52.12 | e | 51.71 | 42.59 | c | 30.08 | f | 18.86 | i | 13.93 | d | 31.96 | c | |||
1978 | 12.66 | b | 11.19 | a | 22.59 | b | 24.65 | d | 31.17 | a | 42.14 | a | 48.83 | g | 44.70 | a | 40.17 | 31.90 | b | 25.66 | a | 6.93 | d | 26.70 | a | |
1979 | 4.85 | d | 9.19 | a | 20.10 | b | 27.31 | n | 35.90 | a | 40.45 | a | 47.85 | e | 46.58 | 41.20 | 30.29 | 14.60 | 13.73 | e | 27.70 | a | ||||
1980 | 18.54 | c | 20.39 | f | 20.03 | b | 18.82 | s | 33.67 | a | 40.04 | b | 49.29 | c | 48.45 | 40.03 | 25.52 | j | 17.29 | b | 18.68 | c | 31.78 | c | ||
1981 | 12.77 | 14.57 | 21.65 | 28.29 | b | 35.79 | b | 44.23 | 51.84 | f | 48.87 | a | 42.70 | c | 30.37 | a | 20.21 | a | 13.40 | k | 29.94 | b | ||||
1982 | 4.41 | d | 12.82 | 22.07 | a | 23.75 | v | 33.00 | 38.90 | a | 49.27 | a | 51.69 | b | 45.17 | a | 26.93 | a | 20.35 | g | 13.56 | f | 31.58 | c | ||
1983 | 13.19 | 15.84 | c | 23.54 | g | 23.46 | b | 29.72 | b | 40.60 | 49.70 | a | 51.97 | 43.52 | c | 32.70 | a | 19.44 | e | 13.71 | c | 30.35 | a | |||
1984 | 5.37 | a | 10.59 | 19.15 | d | 24.17 | 35.88 | e | 43.72 | a | 50.69 | b | 51.03 | 42.77 | d | 27.75 | k | 19.59 | c | 19.52 | 29.32 | a | ||||
1985 | 13.58 | 5.71 | g | 23.63 | a | 29.22 | c | 36.59 | b | 42.50 | 50.00 | b | 48.12 | n | 37.07 | c | 32.52 | f | 23.36 | b | 13.64 | c | 29.96 | c | ||
1986 | 16.37 | d | 18.84 | c | 22.97 | 27.97 | 31.15 | d | 43.86 | b | 48.32 | 50.23 | a | 41.00 | b | 29.30 | h | 23.00 | a | 12.10 | k | 32.37 | b | |||
1987 | 10.16 | 17.21 | 17.84 | f | 24.92 | e | 34.74 | 41.90 | 46.13 | 46.63 | a | 37.30 | 29.33 | d | 19.46 | b | 9.10 | k | 30.78 | b | ||||||
1988 | -0.50 | i | 20.57 | v | 23.27 | a | 31.87 | 39.65 | 50.63 | 52.97 | 52.77 | 45.23 | 39.26 | 23.41 | a | 15.10 | 37.42 | b | ||||||||
1989 | 12.84 | 19.82 | 28.55 | 36.63 | 42.06 | 49.27 | 53.94 | 50.87 | 47.43 | 35.42 | 24.90 | 16.32 | 34.84 | |||||||||||||
1990 | 14.13 | 18.96 | 28.94 | 35.83 | 39.08 | g | 52.08 | f | 54.63 | l | 50.97 | b | 48.90 | a | 34.21 | c | 28.53 | m | 9.73 | a | 30.21 | d | ||||
1991 | 12.68 | 21.68 | 24.19 | 29.70 | 40.26 | 49.30 | 53.97 | 52.87 | 46.00 | f | 37.03 | 21.53 | 17.47 | a | 32.79 | a | ||||||||||
1992 | 12.74 | 22.39 | a | 27.80 | a | 35.33 | 41.87 | h | 48.43 | 52.83 | a | 50.19 | 46.10 | 38.07 | a | 18.86 | a | 15.17 | a | 33.45 | a | |||||
1993 | 20.47 | a | ----- | z | ----- | z | ----- | z | ----- | z | 47.40 | 54.52 | 52.90 | 44.73 | 32.26 | 21.93 | 15.97 | 36.27 | d | |||||||
1994 | 16.74 | 16.36 | 28.19 | 32.53 | 41.58 | 52.77 | 54.97 | 54.58 | 47.89 | l | 34.00 | 21.70 | 19.16 | f | 35.34 | b | ||||||||||
1995 | 17.97 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.74 | 50.13 | 38.63 | 22.00 | 17.31 | a | 11.84 | 29.37 | e | ||||||
1996 | 6.39 | 15.11 | b | 15.93 | d | 25.50 | j | 39.90 | b | 48.90 | 53.89 | c | 51.77 | a | 40.03 | a | 26.25 | g | 20.48 | c | 12.57 | a | 30.50 | b | ||
1997 | 11.19 | 17.88 | b | 21.45 | 25.39 | g | 37.63 | a | 45.00 | b | 50.59 | d | 49.90 | a | 45.07 | 27.70 | a | 19.73 | 10.26 | d | 30.58 | a | ||||
1998 | 13.17 | b | 15.40 | c | 20.40 | a | 23.78 | g | 32.83 | b | 40.45 | a | 52.97 | a | 49.88 | e | 44.20 | 31.61 | c | 22.84 | e | 13.07 | b | 30.62 | a | |
1999 | 13.32 | c | 16.00 | a | 23.80 | a | 24.53 | 34.37 | a | 41.79 | a | 52.40 | a | 49.41 | b | 39.30 | 26.61 | 19.80 | e | 7.35 | 29.06 | |||||
2000 | 12.55 | 18.76 | 21.60 | a | 24.60 | e | 38.83 | a | 55.74 | g | ----- | z | 52.23 | e | 43.93 | a | 33.75 | c | 17.21 | a | 16.34 | b | 27.98 | b | ||
2001 | 9.67 | a | 17.54 | 23.55 | b | 30.55 | a | 39.20 | a | 47.89 | b | 54.94 | 51.68 | 44.67 | 30.81 | e | 24.55 | a | 10.32 | c | 32.11 | |||||
2002 | 12.52 | f | 10.63 | a | 18.71 | 32.40 | 37.75 | c | 49.96 | d | 54.90 | a | 47.31 | e | 40.52 | c | 31.33 | a | 20.81 | d | 13.48 | 32.53 | a | |||
2003 | 19.00 | b | 19.04 | b | 22.63 | a | 27.41 | a | 38.62 | e | 44.22 | l | 55.43 | a | 52.78 | d | 42.65 | d | 35.21 | b | 21.28 | a | 14.22 | d | 31.66 | a |
2004 | 15.04 | c | 12.57 | a | 27.33 | d | 31.03 | 36.87 | 46.78 | c | 50.21 | c | 50.28 | b | 42.26 | c | 31.38 | b | 22.08 | e | 12.63 | d | 31.54 | |||
2005 | 20.45 | b | 22.44 | c | 21.10 | a | 26.11 | b | 36.96 | f | 43.59 | c | 52.03 | a | 49.96 | c | 44.39 | b | 33.57 | a | 19.85 | c | 9.11 | c | 31.15 | a |
2006 | 10.72 | f | 11.88 | c | 22.86 | c | 29.65 | d | 38.17 | b | 48.04 | f | 55.52 | h | 52.93 | b | 38.18 | b | 31.28 | b | 20.52 | a | 11.84 | f | 30.68 | d |
2007 | 7.11 | c | 15.04 | d | 24.74 | d | ----- | z | 38.32 | f | 45.45 | h | 53.68 | c | 52.33 | a | 43.23 | d | 30.36 | f | 21.52 | a | 8.42 | e | 28.26 | d |
2008 | 7.10 | a | 13.59 | 19.83 | b | 22.85 | c | 33.27 | e | 44.97 | a | 52.55 | b | 51.74 | d | 41.00 | a | 30.00 | c | 22.56 | c | 13.21 | b | 29.39 | ||
2009 | 12.70 | d | 16.26 | e | 21.45 | b | 24.82 | b | ----- | z | 44.31 | d | 53.43 | c | 48.38 | g | 41.72 | a | 32.47 | l | ----- | z | 4.79 | q | 30.67 | e |
2010 | 8.08 | e | 13.32 | f | 18.52 | f | 27.34 | a | 33.83 | b | 46.89 | c | 55.36 | c | 50.29 | c | 43.86 | a | 34.08 | e | 16.28 | a | 19.60 | k | 35.11 | c |
2011 | 7.92 | e | 12.79 | d | 23.60 | a | 25.89 | c | 33.46 | c | 44.09 | h | 53.08 | g | 52.52 | b | 43.60 | e | 30.17 | b | 21.77 | d | 10.71 | c | 26.24 | b |
2012 | 13.67 | d | 16.29 | a | 16.19 | o | 35.00 | x | 38.26 | d | 48.46 | f | 53.24 | b | 52.87 | 42.72 | a | 28.07 | c | ----- | z | 10.07 | b | 31.90 | d | |
2013 | 3.83 | b | ----- | z | ----- | z | 27.46 | f | 34.19 | e | ----- | z | 55.07 | b | 53.07 | b | 45.58 | d | 27.17 | b | 23.11 | b | 8.33 | d | 31.29 | d |
2014 | 11.03 | a | 18.00 | f | 21.44 | d | 25.27 | d | 35.50 | c | ----- | z | 54.23 | e | 49.43 | c | 47.04 | c | 32.96 | e | 20.72 | a | 17.03 | b | 31.47 | b |
2015 | 16.57 | c | 20.21 | d | 25.93 | b | 27.40 | 36.13 | a | 47.42 | d | 52.93 | a | 51.40 | a | 45.97 | a | 37.07 | a | 22.14 | a | 10.07 | c | 32.77 | ||
2016 | 9.40 | a | -2.00 | x | ----- | z | ----- | z | 36.21 | c | 50.71 | b | 52.93 | d | 49.14 | b | 41.92 | e | 34.10 | 24.79 | a | 16.19 | 35.04 | c | ||
2017 | 17.04 | e | 23.59 | a | 25.04 | e | 28.27 | 34.00 | b | 47.24 | e | 53.76 | f | 50.70 | h | 43.71 | b | 31.09 | h | 24.64 | b | 13.53 | a | 28.56 | c | |
2018 | 10.94 | m | 16.45 | f | 21.57 | a | 29.00 | a | 38.83 | a | 48.12 | e | 54.28 | b | 51.54 | c | 44.42 | f | 34.47 | a | 17.47 | 12.00 | b | 34.14 | c | |
2019 | 11.04 | e | 15.11 | a | 26.90 | b | 30.56 | c | 34.43 | c | 45.75 | b | 54.36 | c | 52.29 | c | 45.58 | d | 26.07 | c | 20.24 | a | 14.68 | 31.42 | ||
2020 | 10.34 | b | 17.07 | 26.33 | a | 28.50 | 38.86 | b | 47.79 | a | 54.10 | 54.30 | a | 43.19 | c | 32.14 | c | 24.67 | c | 7.65 | 32.08 | |||||
2021 | 12.38 | b | 14.19 | a | 20.89 | c | 28.66 | a | 37.46 | c | 50.07 | c | 54.89 | c | 50.65 | 45.10 | 30.67 | d | 22.33 | c | 17.30 | a | 32.05 | |||
2022 | 9.63 | a | ----- | z | 18.70 | k | 25.89 | c | 37.93 | b | 50.08 | d | 54.74 | d | 53.00 | c | 47.45 | j | 33.00 | d | 14.62 | a | 12.66 | b | 32.39 | c |
2023 | 9.17 | a | 10.95 | f | 21.15 | e | 24.48 | i | 37.77 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.70 | i |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.33 | 15.65 | 22.53 | 27.67 | 35.85 | 45.54 | 52.08 | 50.61 | 42.63 | 31.50 | 20.63 | 12.57 | 31.69 | |||||||||||||
S.D. | 4.75 | 4.24 | 3.24 | 3.86 | 3.32 | 3.62 | 2.61 | 2.23 | 2.74 | 3.63 | 2.84 | 3.30 | 1.73 | |||||||||||||
SKEW | -0.13 | -0.43 | 0.08 | 0.48 | -0.47 | -0.03 | -0.56 | -0.64 | -0.10 | -0.18 | -0.42 | 0.10 | 0.05 | |||||||||||||
MAX | 20.47 | 23.59 | 28.94 | 36.63 | 42.06 | 52.77 | 55.43 | 54.58 | 48.90 | 39.26 | 25.66 | 19.52 | 34.84 | |||||||||||||
MIN | 1.65 | 5.43 | 15.93 | 21.04 | 26.60 | 38.90 | 46.13 | 44.70 | 37.07 | 22.00 | 14.45 | 6.93 | 29.06 | |||||||||||||
YRS | 47 | 38 | 42 | 38 | 42 | 39 | 44 | 48 | 48 | 42 | 46 | 43 | 9 |