YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1968 | 21.90 | 29.28 | 30.39 | 26.73 | 33.45 | 37.40 | 45.42 | 43.39 | 41.70 | 32.65 | 29.62 | a | 19.00 | 32.58 | ||||||||||||
1969 | 11.97 | a | 19.50 | 26.84 | 31.37 | 38.29 | 47.07 | 43.74 | 43.32 | 42.97 | 31.81 | 28.63 | 24.77 | 32.52 | ||||||||||||
1970 | 23.00 | 29.04 | 27.87 | 27.93 | 35.16 | 47.40 | 47.32 | 46.32 | 38.10 | 34.23 | 30.30 | 22.23 | a | 34.08 | ||||||||||||
1971 | 25.13 | 26.71 | 26.58 | 30.33 | 38.53 | a | 39.13 | 48.74 | 49.52 | 38.93 | 33.81 | 29.23 | 23.06 | 34.14 | ||||||||||||
1972 | 20.63 | a | 26.34 | 30.19 | 28.00 | 38.68 | 44.07 | 48.68 | 49.83 | a | 39.07 | 33.06 | 32.77 | 18.10 | 34.12 | |||||||||||
1973 | 19.93 | a | 26.36 | 27.19 | 27.83 | 35.68 | 40.00 | 42.94 | 38.39 | 40.37 | 32.35 | 26.73 | 28.26 | 32.17 | ||||||||||||
1974 | 16.52 | 26.86 | 27.19 | 32.29 | b | 34.03 | 41.13 | 43.23 | 43.00 | 38.83 | 31.10 | 29.70 | 24.97 | 32.40 | ||||||||||||
1975 | 21.77 | 21.89 | 25.23 | 25.47 | 33.29 | 37.60 | 47.52 | 41.65 | 38.68 | b | 33.71 | 27.47 | 25.29 | 31.63 | ||||||||||||
1976 | 23.73 | a | 22.21 | 23.45 | 30.07 | 33.06 | 36.20 | 43.45 | 43.42 | 42.67 | 30.13 | 29.47 | 21.77 | 31.64 | ||||||||||||
1977 | 17.58 | 25.33 | a | 25.87 | 30.10 | 32.55 | 42.03 | 41.84 | 49.35 | 37.53 | 32.23 | 26.17 | 25.23 | 32.15 | ||||||||||||
1978 | 24.97 | 27.79 | 29.10 | 32.20 | 31.65 | 40.90 | 44.32 | 46.52 | 39.55 | a | 30.94 | 19.33 | 13.55 | 31.73 | ||||||||||||
1979 | 5.68 | 24.11 | 27.39 | 28.80 | 33.77 | 38.67 | 43.58 | 43.94 | 41.86 | a | 35.07 | b | 24.07 | 25.23 | 31.01 | |||||||||||
1980 | 14.45 | 27.00 | b | 25.90 | b | 33.14 | a | 35.73 | a | 38.69 | a | 44.61 | 39.77 | 40.43 | 31.37 | a | 29.20 | 27.00 | 32.27 | |||||||
1981 | 28.52 | 25.85 | a | 28.10 | 31.30 | 34.90 | 40.37 | 40.74 | 45.75 | c | 38.07 | a | 29.55 | b | 26.76 | a | 22.13 | a | 32.67 | |||||||
1982 | 17.77 | a | 20.85 | a | 24.79 | b | 25.66 | a | 30.67 | a | 41.57 | 41.65 | 44.10 | 41.50 | 32.62 | e | 24.21 | b | 21.03 | 30.53 | ||||||
1983 | 28.03 | 29.92 | b | 32.35 | 29.33 | 35.10 | a | 37.87 | 41.79 | b | 43.00 | a | 33.00 | 30.18 | c | 31.86 | b | 15.19 | 32.30 | |||||||
1984 | 22.90 | 27.08 | c | 30.55 | b | 28.89 | b | 33.97 | a | 38.23 | 42.07 | a | 40.90 | 36.20 | 28.06 | 26.33 | 15.97 | a | 30.93 | |||||||
1985 | 15.81 | 17.25 | ----- | z | 28.76 | a | 32.65 | 37.22 | c | 42.50 | a | 36.19 | d | 31.66 | a | 27.60 | a | 15.71 | b | 9.65 | 26.82 | a | ||||
1986 | 23.32 | 24.04 | c | 29.43 | a | 24.41 | a | 33.17 | b | 39.82 | b | 39.58 | 45.93 | a | 35.79 | a | 33.77 | 27.90 | a | 21.57 | a | 31.56 | ||||
1987 | 20.19 | 25.75 | 28.71 | 33.46 | b | 37.17 | b | 40.33 | c | 40.31 | o | 36.82 | t | 33.60 | y | ----- | z | 23.17 | r | 15.41 | n | 30.94 | f | |||
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.36 | b | 47.52 | d | 44.59 | d | 40.74 | c | 41.10 | b | 28.84 | k | ----- | z | 43.06 | g |
1989 | ----- | z | 14.09 | q | ----- | z | 35.62 | f | 36.45 | k | 44.52 | a | 45.50 | g | 44.70 | d | 41.09 | h | 35.07 | d | 32.58 | r | 22.88 | n | 41.43 | i |
1990 | ----- | z | 17.36 | q | 29.43 | a | 34.80 | e | 33.82 | i | 44.00 | d | 51.56 | f | 49.46 | c | 46.79 | f | 33.25 | g | 26.80 | t | 11.54 | r | 39.42 | h |
1991 | ----- | z | ----- | z | 26.67 | d | 30.96 | c | 35.52 | h | 38.04 | d | 47.78 | d | 50.33 | j | 43.61 | g | 33.87 | h | 29.00 | p | 25.71 | x | 35.86 | h |
1992 | 22.43 | x | 28.38 | u | 32.78 | m | 37.32 | k | 37.94 | m | 47.20 | j | 48.23 | i | 46.29 | j | 39.71 | m | 35.17 | y | ----- | z | ----- | z | ----- | z |
1993 | 13.00 | y | ----- | z | 31.00 | p | 33.00 | h | 41.42 | s | 41.59 | m | 41.05 | k | 42.07 | q | 41.36 | h | 36.37 | d | 17.69 | q | 24.19 | o | 36.37 | k |
1994 | 29.62 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | 25.58 | e | 29.14 | g | 28.93 | d | 31.46 | b | 38.32 | c | 42.52 | a | 47.77 | a | 43.14 | c | 46.00 | a | 33.79 | b | 33.37 | c | 25.19 | d | 36.01 | a |
1996 | 20.58 | g | 21.11 | j | 28.35 | e | 34.10 | a | 34.00 | c | 41.61 | b | 49.86 | c | 48.09 | i | 39.00 | e | 35.04 | c | 28.55 | j | 23.39 | c | 35.67 | d |
1997 | 22.27 | e | 25.56 | c | 30.15 | e | 30.80 | e | 40.69 | b | ----- | z | 48.28 | b | 50.57 | a | 46.78 | c | ----- | z | 31.19 | c | 23.85 | e | 35.01 | b |
1998 | 26.61 | c | 29.14 | g | 31.33 | g | 32.43 | 39.57 | h | 42.85 | c | 51.97 | 48.63 | d | 47.00 | e | 33.00 | e | 32.38 | d | 22.84 | f | 39.36 | d | ||
1999 | 28.23 | i | 27.56 | j | 29.35 | k | ----- | z | 33.14 | b | 39.23 | d | 45.33 | d | 50.52 | b | 40.63 | c | 33.45 | i | 32.40 | j | 28.70 | k | 41.77 | g |
2000 | 21.91 | i | 24.95 | j | 28.33 | d | 34.14 | b | 37.42 | e | 44.54 | b | 45.45 | b | 44.87 | a | 39.88 | e | 34.29 | j | 22.70 | g | 22.13 | h | 39.23 | e |
2001 | 23.71 | q | 20.00 | p | 27.76 | j | 30.81 | d | 37.26 | d | 40.88 | d | 45.97 | b | 49.28 | b | 44.12 | e | 33.48 | h | 32.17 | g | 24.43 | c | 38.96 | e |
2002 | 25.38 | e | 25.55 | h | 26.00 | 31.64 | b | 36.50 | c | 44.37 | 49.30 | a | 45.74 | d | 41.63 | c | 31.74 | 29.46 | b | 27.42 | 35.38 | a | ||||
2003 | 25.86 | x | 26.22 | j | 32.41 | b | 32.40 | 38.77 | a | 43.55 | a | 48.07 | a | 49.77 | a | 46.43 | b | 39.38 | g | 25.50 | d | 25.68 | i | 39.61 | d | |
2004 | 20.16 | f | 25.79 | a | 32.00 | b | 33.47 | 39.19 | 44.55 | a | 49.80 | a | 51.81 | 42.86 | b | 36.89 | c | 29.25 | f | 27.86 | b | 38.42 | b | |||
2005 | 23.70 | d | 25.42 | d | 30.93 | a | 33.96 | e | 41.83 | b | 41.11 | c | 47.64 | c | 48.07 | b | 40.17 | 36.54 | c | 26.61 | b | 18.44 | d | 34.53 | ||
2006 | 29.63 | a | 23.00 | d | 28.97 | 33.39 | b | 39.73 | a | 45.00 | 49.42 | 45.55 | 41.30 | 32.34 | b | 29.40 | 20.81 | d | 34.88 | |||||||
2007 | 17.74 | d | 26.82 | 30.77 | 32.40 | 37.32 | 43.48 | e | 51.40 | a | 45.67 | a | 39.03 | 33.58 | 27.30 | c | 21.73 | a | 33.94 | |||||||
2008 | 18.45 | 25.24 | 25.50 | c | 26.20 | 40.17 | a | 39.77 | 47.39 | 47.74 | 39.58 | f | 33.84 | 31.26 | c | 18.13 | a | 32.15 | a | |||||||
2009 | 21.53 | a | 24.26 | a | 23.83 | a | 30.60 | 38.57 | a | 44.79 | a | 50.35 | 47.86 | c | 42.55 | a | 32.59 | b | 28.27 | 18.45 | 33.64 | |||||
2010 | 29.68 | 29.59 | a | 28.50 | a | 31.53 | 35.29 | 41.70 | 46.77 | 45.97 | 43.61 | b | 36.39 | 27.19 | d | 24.27 | e | 35.04 | ||||||||
2011 | 25.22 | h | 21.12 | d | 28.90 | 28.07 | c | 34.46 | c | 40.04 | d | 44.93 | c | 45.50 | e | 45.37 | c | 37.00 | a | 25.62 | n | 21.88 | f | 36.16 | c | |
2012 | 20.65 | n | 26.73 | g | 27.17 | g | 35.09 | g | 35.55 | b | 42.11 | b | 47.60 | a | 48.13 | a | 42.54 | d | ----- | z | 34.43 | w | 28.07 | q | 43.19 | g |
2013 | 18.71 | q | ----- | z | ----- | z | 34.00 | u | 37.65 | h | 44.88 | d | 49.00 | g | 50.79 | g | 47.82 | h | 33.71 | j | 26.88 | n | ----- | z | 44.88 | k |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | 39.90 | j | 40.40 | j | 48.62 | o | 51.29 | j | 42.11 | u | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | 27.63 | d | 30.05 | i | 31.47 | n | 32.50 | x | 40.20 | f | 46.73 | d | 49.60 | a | 50.00 | e | 37.83 | x | 39.47 | n | 24.94 | m | 21.75 | k | 43.49 | h |
2016 | 23.26 | l | 29.50 | g | 29.80 | k | 33.18 | m | 40.00 | g | 44.60 | 46.83 | g | 48.69 | e | 39.61 | l | 36.26 | 33.52 | i | 17.25 | k | 43.18 | i | ||
2017 | 12.76 | f | 21.19 | g | 31.53 | n | 29.41 | h | 36.22 | d | 42.21 | b | 47.57 | a | 51.85 | k | 43.15 | j | 32.15 | e | 29.12 | n | 22.60 | p | 39.54 | h |
2018 | 27.14 | x | 18.90 | r | 23.40 | p | 31.68 | e | 42.32 | i | 42.58 | k | 47.82 | n | 48.94 | m | 38.68 | k | 34.29 | j | 27.67 | i | 23.46 | r | 31.68 | k |
2019 | 24.43 | q | 16.00 | n | 21.72 | b | 33.17 | a | 40.89 | d | 41.65 | g | 46.32 | f | 49.71 | n | 43.14 | p | 29.55 | i | 22.56 | u | 22.92 | s | 31.93 | i |
2020 | 27.16 | l | 27.36 | o | 25.75 | c | 33.94 | n | 36.12 | n | 44.12 | f | 44.62 | o | 46.11 | v | 43.36 | s | 37.35 | k | 26.55 | s | 25.25 | s | 25.75 | k |
2021 | 26.62 | r | 18.80 | r | 27.55 | t | 26.80 | t | 34.93 | p | 48.08 | f | 49.64 | i | 50.53 | l | 41.29 | i | 33.95 | i | 30.31 | n | 22.62 | j | ----- | z |
2022 | 21.70 | h | ----- | z | 28.39 | h | 26.57 | i | 35.53 | n | 43.42 | k | 49.24 | j | 50.71 | n | 42.93 | o | 40.00 | l | 21.88 | m | 15.05 | k | ----- | z |
2023 | 23.40 | k | 18.81 | l | 23.32 | l | 30.29 | i | 42.84 | l | 42.53 | k | 48.89 | m | 51.53 | n | 43.32 | k | 36.75 | w | ----- | z | ----- | z | ----- | z |
2024 | ----- | z | ----- | z | 30.27 | t | 30.50 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.68 | 25.17 | 27.95 | 30.60 | 36.07 | 41.65 | 46.18 | 45.87 | 40.72 | 33.28 | 27.91 | 21.87 | 32.72 | |||||||||||||
S.D. | 5.38 | 3.03 | 2.52 | 2.65 | 2.80 | 2.83 | 3.11 | 3.51 | 3.48 | 2.70 | 3.72 | 4.39 | 1.32 | |||||||||||||
SKEW | -0.83 | -0.69 | -0.28 | -0.55 | 0.19 | 0.10 | -0.23 | -0.59 | -0.34 | 0.35 | -1.39 | -0.84 | 0.26 | |||||||||||||
MAX | 29.68 | 29.92 | 32.41 | 34.80 | 41.83 | 47.40 | 51.97 | 51.81 | 47.00 | 41.10 | 33.37 | 28.26 | 35.04 | |||||||||||||
MIN | 5.68 | 17.25 | 21.72 | 24.41 | 30.67 | 36.20 | 39.58 | 36.19 | 31.66 | 27.60 | 15.71 | 9.65 | 30.53 | |||||||||||||
YRS | 31 | 29 | 37 | 40 | 39 | 45 | 41 | 41 | 37 | 36 | 30 | 31 | 23 |