YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.73 | s | 39.58 | 42.58 | 35.70 | 31.94 | 29.47 | 22.07 | b | 33.56 | f | |||||
1975 | 22.74 | 20.11 | a | 23.32 | 24.17 | 30.65 | 37.93 | 44.35 | 39.16 | 35.97 | 33.10 | 22.23 | 21.26 | 29.58 | ||||||||||||
1976 | 18.29 | 19.28 | 20.58 | 25.93 | 31.48 | 35.20 | 43.53 | a | 43.68 | 39.17 | 28.61 | 27.60 | 19.39 | 29.40 | ||||||||||||
1977 | 13.61 | 22.79 | 21.23 | 26.40 | 31.71 | 38.57 | 39.87 | 48.39 | 36.63 | ----- | z | ----- | z | ----- | z | 31.02 | c | |||||||||
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.42 | ----- | z | ----- | z | 28.42 | k | |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.89 | l | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.71 | 33.48 | 33.43 | 29.65 | 26.71 | b | 22.79 | b | 31.13 | f | ||||
1981 | 24.53 | a | 21.54 | b | 25.83 | a | 27.70 | 29.10 | 36.40 | e | 36.85 | e | 40.77 | e | 36.22 | c | 28.10 | k | 29.15 | d | 24.27 | a | 30.21 | a | ||
1982 | 12.58 | g | 13.27 | b | 20.68 | i | 22.62 | a | 29.16 | 39.87 | 41.53 | a | 43.37 | d | 35.52 | g | ----- | z | 20.73 | d | 16.75 | g | 30.08 | e | ||
1983 | 22.69 | e | ----- | z | 22.22 | v | 26.20 | 33.10 | a | 36.89 | k | ----- | z | ----- | z | 30.56 | u | 32.70 | d | ----- | z | ----- | z | 28.67 | h | |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | 31.11 | m | 36.44 | e | 42.29 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.44 | k |
1985 | 16.63 | l | 16.62 | g | 21.08 | g | 27.54 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.72 | e | 20.71 | g | 25.72 | k |
1988 | 18.56 | f | 20.57 | h | 23.38 | g | 31.62 | n | 31.17 | h | 35.71 | m | 41.00 | i | 38.96 | d | 34.96 | g | 35.43 | j | 26.44 | e | 20.83 | g | 32.70 | j |
1989 | 18.00 | j | 10.48 | g | 25.24 | j | 29.25 | r | 30.46 | g | 36.17 | l | 39.73 | i | 35.00 | h | 30.80 | o | 27.91 | t | 23.75 | j | 21.04 | e | 21.04 | k |
1990 | 23.88 | e | 17.88 | d | ----- | z | 32.33 | r | 36.14 | x | ----- | z | 47.20 | k | ----- | z | 37.60 | t | ----- | z | 28.33 | f | 11.25 | g | 20.88 | j |
1991 | 20.68 | f | 28.04 | d | 24.75 | c | 29.67 | r | 31.12 | n | ----- | z | 42.33 | s | 43.55 | i | 34.84 | k | 31.67 | d | 30.15 | d | 24.32 | i | 28.65 | h |
1992 | 23.43 | c | 27.40 | d | ----- | z | 32.36 | h | 39.82 | n | 41.00 | o | 43.17 | g | 40.29 | g | 37.88 | e | 29.71 | j | 24.90 | i | 18.90 | 26.90 | h | |
1993 | 14.93 | d | 15.32 | 28.41 | d | 27.92 | r | 32.70 | d | 37.00 | b | 38.90 | b | 41.71 | c | 34.21 | a | 33.90 | 18.03 | 20.73 | a | 28.71 | a | |||
1994 | 23.17 | b | 20.32 | c | 25.48 | d | 31.79 | f | 38.08 | e | 40.55 | a | 47.74 | 39.88 | f | 44.10 | i | 32.83 | h | 18.75 | j | 19.65 | e | 30.71 | e | |
1995 | 25.59 | d | 26.89 | a | 24.32 | 26.72 | l | 33.23 | r | 38.21 | f | 44.44 | o | ----- | z | 40.06 | n | 32.04 | f | 29.93 | b | 24.57 | h | 26.68 | h | |
1996 | 23.87 | a | 21.22 | f | 25.55 | b | 28.00 | r | 33.07 | p | 37.67 | x | 44.67 | g | 44.07 | d | ----- | z | ----- | z | 30.27 | o | 22.81 | d | 29.08 | h |
1997 | 18.52 | h | 22.62 | g | 25.29 | n | ----- | z | 41.75 | o | 39.15 | c | 43.45 | k | 44.00 | 37.73 | d | 31.77 | a | 29.27 | d | 18.00 | 33.32 | f | ||
1998 | 26.48 | 25.78 | a | 23.79 | c | 28.85 | c | 34.39 | 39.83 | 50.00 | 45.70 | a | 40.21 | a | 29.48 | b | 28.90 | 18.06 | 32.62 | |||||||
1999 | 22.00 | 20.70 | a | 23.87 | 27.00 | 32.19 | 39.73 | 41.37 | a | 45.76 | b | 34.23 | 29.66 | b | 30.40 | 19.42 | 30.53 | |||||||||
2000 | 18.67 | a | 21.79 | e | 21.66 | b | 28.90 | a | 34.23 | a | 39.40 | 41.48 | b | 42.03 | a | 33.93 | c | 29.35 | 21.41 | a | 20.93 | b | 29.48 | |||
2001 | 16.65 | 18.14 | 25.42 | 25.31 | d | 34.97 | b | 36.64 | b | 43.32 | 43.77 | 37.03 | a | 30.75 | c | 27.50 | b | 21.69 | b | 30.10 | ||||||
2002 | 17.67 | d | 16.48 | c | 20.63 | a | 28.34 | a | 32.13 | a | 39.93 | 45.55 | 40.07 | a | 35.72 | a | 25.70 | a | 25.34 | a | 24.83 | a | 29.37 | |||
2003 | 25.73 | a | 19.74 | a | 27.33 | a | 27.93 | 33.52 | b | 40.28 | a | 46.58 | 43.03 | 38.17 | 32.23 | 22.14 | a | 24.93 | b | 31.80 | ||||||
2004 | 22.97 | a | 21.90 | 26.52 | 28.40 | 34.52 | b | 40.20 | 45.13 | 46.03 | 37.03 | 30.34 | b | 25.23 | 23.77 | a | 31.84 | |||||||||
2005 | 21.52 | b | 18.96 | 26.74 | 29.11 | c | 36.43 | a | 37.31 | a | 44.79 | b | 41.85 | e | 34.74 | c | 32.36 | c | 24.78 | c | 18.44 | d | 30.59 | |||
2006 | 24.19 | e | 16.92 | c | 20.65 | 28.35 | j | 34.26 | 39.48 | g | 46.32 | c | 37.38 | b | 35.39 | b | 29.42 | e | 26.55 | a | 15.58 | s | 30.12 | c | ||
2007 | 16.85 | r | 23.74 | a | 28.07 | c | 27.59 | c | 34.48 | 36.38 | a | 48.55 | b | 43.39 | c | 36.32 | b | 29.66 | b | 25.68 | e | 14.84 | f | 33.39 | b | |
2008 | 17.33 | g | 18.30 | f | 17.93 | c | 17.14 | a | 24.75 | g | 30.40 | y | ----- | z | 42.81 | 32.97 | a | 31.42 | e | 28.34 | a | 19.19 | d | 27.11 | e | |
2009 | 18.31 | b | 17.35 | b | 22.14 | j | 25.37 | c | 34.54 | g | 41.84 | e | 45.21 | c | 41.83 | g | 36.10 | j | 30.90 | j | 24.46 | d | 16.46 | g | 28.76 | f |
2010 | 27.48 | f | 24.90 | h | 23.73 | a | 26.23 | d | 31.13 | 37.71 | b | 44.84 | 42.45 | 39.00 | 32.00 | b | 22.63 | c | 22.39 | c | 32.21 | b | ||||
2011 | 19.74 | 19.07 | 25.06 | 25.10 | 29.87 | 38.66 | a | 42.00 | 44.03 | 37.20 | 31.26 | 25.40 | 17.58 | 29.58 | ||||||||||||
2012 | 21.00 | 19.72 | 22.13 | 28.77 | 33.55 | 38.03 | 44.87 | 42.97 | 36.80 | 30.90 | 28.37 | 22.52 | 30.80 | |||||||||||||
2013 | 16.35 | 20.68 | 23.68 | 29.76 | a | 35.26 | 41.31 | a | 47.66 | b | 44.65 | 39.23 | 27.90 | 26.60 | 15.81 | 30.74 | ||||||||||
2014 | 23.03 | 23.75 | 26.06 | 28.57 | 36.26 | 38.27 | 48.00 | a | 45.65 | 38.50 | h | 33.58 | e | 22.41 | h | 27.77 | a | 33.09 | b | |||||||
2015 | 25.34 | b | 27.71 | 27.45 | 27.83 | 36.48 | f | 44.33 | c | 47.25 | c | 44.71 | 36.33 | 34.97 | 25.72 | e | 24.45 | i | 34.17 | b | ||||||
2016 | 21.31 | e | 23.50 | c | 25.65 | 30.83 | a | 36.28 | b | 38.76 | a | 43.61 | 42.00 | i | 33.55 | h | 33.30 | a | 30.20 | 10.82 | c | 29.42 | b | |||
2017 | 12.70 | a | 21.92 | c | 25.73 | a | 26.71 | b | 34.38 | g | 39.48 | g | 43.56 | m | ----- | z | 38.65 | d | 29.63 | a | 25.38 | a | 16.97 | 24.71 | d | |
2018 | 26.21 | b | 19.07 | 21.23 | a | 29.00 | 38.07 | a | 38.22 | c | 44.69 | b | 43.61 | 33.23 | d | 30.33 | a | 25.32 | b | 21.23 | 30.85 | |||||
2019 | 23.32 | c | 15.46 | 18.30 | a | 30.36 | b | 34.61 | 40.03 | a | 40.77 | r | 44.79 | c | 39.22 | c | 26.37 | a | 25.10 | 23.57 | a | 29.19 | a | |||
2020 | 25.63 | a | 19.61 | a | 22.07 | b | 29.17 | a | 35.52 | f | 40.82 | b | 43.08 | f | 44.87 | a | 38.28 | a | 31.55 | 21.33 | c | 19.97 | a | 29.33 | b | |
2021 | 21.73 | a | 22.15 | b | 21.38 | b | 26.79 | b | 32.77 | a | 43.89 | b | 45.83 | h | 42.56 | f | 35.90 | a | 30.97 | 27.85 | c | 22.69 | e | 28.61 | b | |
2022 | 18.17 | b | 19.94 | k | 25.46 | g | 23.90 | a | 30.05 | i | 38.87 | ----- | z | 45.76 | f | 39.96 | e | 30.65 | n | 18.41 | m | 18.60 | f | 30.22 | h | |
2023 | 17.19 | 13.75 | 15.45 | 24.62 | a | 35.85 | d | 38.00 | f | 44.12 | o | 35.88 | f | 35.96 | g | 29.79 | c | 24.29 | b | 18.33 | d | 22.41 | d | |||
2024 | 20.04 | e | 20.52 | f | 19.50 | u | 25.08 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.04 | k |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.22 | 20.61 | 23.64 | 26.92 | 33.60 | 39.08 | 44.08 | 42.89 | 36.66 | 30.75 | 25.95 | 20.68 | 30.52 | |||||||||||||
S.D. | 3.71 | 3.82 | 3.08 | 2.69 | 2.42 | 2.09 | 3.22 | 2.88 | 2.04 | 2.07 | 3.00 | 3.21 | 1.02 | |||||||||||||
SKEW | -0.57 | 0.20 | -0.66 | -1.58 | -0.09 | 0.56 | -0.31 | -1.22 | -0.10 | -0.33 | -0.54 | -0.58 | 0.59 | |||||||||||||
MAX | 26.48 | 28.04 | 28.41 | 30.83 | 38.08 | 44.33 | 50.00 | 48.39 | 40.21 | 34.97 | 30.40 | 27.77 | 32.62 | |||||||||||||
MIN | 12.70 | 13.27 | 15.45 | 17.14 | 29.10 | 35.20 | 36.85 | 33.48 | 32.97 | 25.70 | 18.03 | 10.82 | 29.37 | |||||||||||||
YRS | 35 | 34 | 33 | 31 | 28 | 31 | 28 | 31 | 31 | 33 | 36 | 32 | 14 |