YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1968 | 31.15 | a | 37.91 | 41.71 | 39.72 | 48.47 | 54.22 | a | 64.08 | 58.52 | 56.55 | 44.37 | 37.12 | a | 25.47 | b | 44.94 | |||||||||
1969 | 19.62 | a | 28.09 | 37.61 | 43.42 | 53.50 | 61.17 | 60.66 | 60.06 | 55.40 | 43.76 | 38.21 | a | 29.95 | a | 44.29 | ||||||||||
1970 | 28.39 | 36.11 | 37.45 | 38.38 | 49.82 | a | 62.21 | a | 63.56 | 62.97 | 51.35 | 45.79 | 36.68 | 28.58 | a | 45.11 | ||||||||||
1971 | 32.29 | 35.31 | a | 34.65 | 41.97 | 52.67 | a | 52.98 | 64.71 | 66.79 | b | 53.07 | 45.52 | 37.68 | 29.05 | 45.56 | ||||||||||
1972 | 27.93 | a | 33.76 | 40.77 | 40.03 | 53.47 | a | 58.12 | 63.92 | a | 64.91 | b | 52.80 | 46.76 | 38.67 | 26.00 | 45.59 | |||||||||
1973 | 27.48 | a | 35.18 | 39.08 | 43.75 | 52.92 | 56.43 | 63.85 | 59.56 | 56.08 | 44.82 | 32.23 | 33.87 | 45.44 | ||||||||||||
1974 | 24.32 | a | 35.14 | 37.58 | 43.88 | b | 47.94 | 59.78 | 61.44 | 62.52 | a | 57.77 | 47.02 | 37.50 | 32.16 | 45.59 | ||||||||||
1975 | 29.18 | 30.25 | 35.08 | a | 38.87 | 49.52 | 54.17 | 65.58 | 58.23 | 56.86 | b | 43.98 | 34.90 | a | 32.31 | 44.08 | ||||||||||
1976 | 31.90 | b | 31.02 | 34.80 | a | 42.07 | 49.84 | 52.25 | 61.13 | 59.47 | 58.47 | 45.63 | 38.95 | 31.18 | 44.72 | |||||||||||
1977 | 25.31 | 34.62 | b | 36.16 | 47.70 | 46.23 | a | 60.42 | 60.61 | 66.55 | 51.73 | 45.47 | 34.18 | 31.11 | 45.01 | |||||||||||
1978 | 30.45 | 35.16 | 41.13 | 43.62 | 46.81 | 58.30 | 62.16 | 61.42 | 52.38 | a | 47.06 | 29.53 | 22.26 | b | 44.19 | |||||||||||
1979 | 15.94 | 32.00 | 40.03 | 42.75 | 50.77 | 56.90 | 63.79 | 62.21 | 58.74 | a | 47.83 | b | 31.58 | 32.61 | 44.60 | |||||||||||
1980 | 21.75 | a | 33.62 | c | 36.62 | b | 47.78 | a | 51.82 | a | 54.55 | a | 62.79 | 58.40 | 56.60 | 47.00 | a | 36.63 | 35.14 | c | 45.23 | |||||
1981 | 33.89 | 34.07 | a | 40.45 | 44.12 | 50.28 | a | 54.83 | 59.81 | 65.55 | c | 55.88 | a | 43.03 | m | 36.67 | a | 29.35 | a | 45.90 | a | |||||
1982 | 27.57 | b | 31.07 | a | 37.12 | b | 39.88 | a | 48.68 | a | 59.15 | 60.85 | 62.34 | 55.28 | a | 44.88 | e | 32.26 | c | 27.20 | a | 43.86 | ||||
1983 | 34.45 | 36.44 | c | 41.38 | a | 43.16 | a | 53.02 | b | 54.48 | 58.84 | b | 62.47 | b | 50.42 | 45.93 | c | 37.59 | b | 21.43 | b | 44.97 | ||||
1984 | 30.72 | a | 34.69 | c | 41.48 | b | 41.31 | c | 48.14 | c | 55.02 | 62.85 | a | 61.69 | 52.53 | a | 50.91 | t | 33.12 | e | 24.00 | a | 44.14 | a | ||
1985 | 22.35 | 28.24 | a | ----- | z | 44.43 | a | 50.19 | 55.46 | d | 66.20 | a | 58.21 | e | 47.97 | a | 41.95 | b | 24.07 | b | 18.11 | 41.56 | a | |||
1986 | 31.00 | 32.20 | c | 41.90 | a | 40.48 | c | 50.34 | c | 60.00 | c | 58.17 | a | 66.13 | a | 50.03 | a | 48.77 | 35.47 | a | 27.62 | a | 45.18 | |||
1987 | 27.60 | 34.64 | 39.02 | 48.24 | c | 52.17 | d | 60.42 | e | 58.75 | o | 59.41 | t | 56.10 | y | ----- | z | 35.50 | s | 24.29 | n | 43.68 | f | |||
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.84 | e | 64.98 | d | 62.98 | d | 57.75 | d | 55.29 | b | 37.08 | k | ----- | z | 59.57 | g |
1989 | ----- | z | 31.33 | s | ----- | z | 47.94 | f | 50.88 | k | 59.53 | a | 62.98 | g | 60.35 | e | 58.41 | h | 48.28 | d | 42.36 | s | 32.35 | n | 56.05 | i |
1990 | ----- | z | 29.82 | q | 41.36 | c | 48.26 | e | 48.02 | j | 58.60 | e | 69.00 | g | 65.73 | c | 64.09 | g | 45.57 | h | 38.00 | t | 21.58 | r | 53.49 | h |
1991 | ----- | z | ----- | z | 37.56 | d | 43.43 | c | 48.61 | i | 52.54 | e | 65.54 | e | 68.21 | j | 62.15 | g | 47.89 | h | 37.89 | p | 33.64 | x | 49.76 | h |
1992 | 31.14 | x | 39.06 | u | 46.64 | m | 49.53 | k | 56.08 | m | 65.47 | k | 64.71 | j | 66.12 | j | 55.53 | o | 54.33 | y | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | 39.27 | p | 43.18 | h | 57.46 | s | 56.82 | m | 56.73 | k | 61.18 | q | 60.17 | i | 51.24 | d | 31.35 | q | 31.77 | p | 51.24 | k |
1994 | 38.94 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | 31.58 | f | 38.81 | g | 40.12 | f | 43.54 | e | 54.06 | d | 57.23 | d | 64.32 | c | 60.04 | g | 61.29 | b | 46.08 | e | 40.79 | d | 30.40 | f | 52.47 | e |
1996 | 28.67 | g | 30.82 | j | 39.46 | e | 46.34 | b | 47.61 | c | 57.88 | b | 69.04 | d | 68.12 | j | 55.88 | e | 45.71 | e | 37.27 | j | 28.86 | c | 48.85 | d |
1997 | 29.56 | e | 33.10 | c | 39.77 | e | 42.52 | e | 55.12 | c | ----- | z | 64.89 | c | 67.17 | d | 60.52 | e | ----- | z | 38.85 | c | 30.56 | f | 47.94 | c |
1998 | 33.63 | e | 36.14 | g | 42.07 | i | 45.20 | b | 52.50 | i | 58.17 | d | 69.81 | b | 68.06 | d | 64.96 | f | 46.71 | e | 38.73 | d | 29.26 | f | 51.47 | e |
1999 | 35.18 | i | 33.92 | j | 39.65 | k | ----- | z | 47.83 | d | 55.30 | e | 63.26 | d | 68.15 | e | 58.48 | e | 48.48 | i | 40.73 | j | 35.08 | k | 58.61 | g |
2000 | 29.45 | i | 33.45 | j | 39.19 | e | 48.43 | b | 50.92 | f | 60.55 | b | 63.93 | b | 64.68 | a | 57.40 | e | 47.81 | j | 31.91 | g | 27.91 | h | 55.70 | f |
2001 | 30.32 | q | 32.38 | p | 40.40 | j | 42.96 | e | 54.56 | d | 56.50 | e | 64.00 | b | 67.33 | b | 61.30 | e | 47.13 | h | 38.35 | g | 29.52 | c | 53.74 | e |
2002 | 31.67 | e | 35.40 | h | 35.68 | 45.20 | b | 50.48 | c | 59.47 | 67.83 | a | 63.94 | d | 58.59 | c | 46.08 | a | 38.93 | b | 31.35 | 48.11 | a | |||
2003 | 31.50 | x | 36.61 | j | 42.21 | b | 44.07 | a | 52.88 | c | 61.05 | a | 69.12 | a | 67.90 | b | 62.43 | b | 52.62 | g | 32.52 | d | 30.95 | j | 54.02 | d |
2004 | 25.80 | f | 34.07 | a | 43.60 | b | 48.27 | 52.15 | 60.09 | a | 67.50 | a | 68.16 | 57.07 | b | 48.66 | c | 39.12 | f | 34.48 | b | 51.40 | b | |||
2005 | 31.27 | e | 36.65 | d | 43.33 | b | 46.04 | e | 55.12 | b | 56.30 | c | 66.75 | c | 67.88 | c | 57.03 | 48.38 | c | 33.54 | b | 24.98 | d | 47.27 | ||
2006 | 34.42 | a | 32.02 | d | 37.90 | 44.89 | b | 53.85 | a | 59.58 | 67.98 | 64.42 | 58.62 | 46.70 | c | 35.47 | 27.69 | d | 46.96 | |||||||
2007 | 26.09 | d | 34.25 | 41.97 | 44.62 | 53.05 | a | 58.60 | e | 69.32 | a | 63.15 | a | 55.65 | 45.16 | 35.85 | c | 28.47 | a | 46.35 | ||||||
2008 | 25.74 | 34.53 | 35.95 | c | 39.37 | 53.62 | a | 56.07 | 65.29 | 63.81 | 55.48 | f | 46.55 | 39.52 | c | 26.17 | a | 44.24 | a | |||||||
2009 | 28.72 | a | 32.48 | b | 33.58 | a | 43.57 | 52.92 | a | 60.28 | a | 68.53 | 66.12 | c | 59.74 | a | 44.12 | c | 36.00 | 24.92 | 45.92 | |||||
2010 | 34.19 | 37.06 | a | 39.63 | a | 42.77 | 47.74 | 55.85 | 64.71 | 63.74 | 56.80 | b | 48.65 | 35.08 | d | 29.29 | e | 46.29 | ||||||||
2011 | 33.87 | h | 30.42 | d | 36.45 | 38.94 | c | 47.61 | c | 54.58 | d | 61.07 | c | 65.21 | e | 61.81 | c | 47.27 | a | 33.84 | n | 30.68 | f | 49.26 | c | |
2012 | 29.18 | n | 33.93 | g | 35.88 | g | 46.76 | g | 49.83 | b | 55.61 | b | 65.43 | a | 67.37 | a | 60.71 | d | ----- | z | 42.21 | w | 32.82 | q | 59.79 | g |
2013 | 27.54 | q | ----- | z | ----- | z | 49.00 | u | 52.13 | h | 58.65 | d | 68.88 | g | 67.52 | g | 61.20 | h | 46.29 | j | 35.41 | n | ----- | z | 58.65 | k |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | 55.05 | j | 57.38 | j | 68.25 | o | 69.00 | j | 59.89 | u | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | 34.63 | d | 39.76 | i | 44.56 | n | 48.00 | x | 55.82 | f | 65.65 | d | 68.92 | a | 68.15 | e | 53.83 | x | 52.68 | n | 33.82 | m | 27.82 | k | 59.34 | h |
2016 | 28.39 | l | 37.91 | g | 39.85 | k | 49.24 | m | 54.27 | g | 60.73 | 64.94 | g | 67.48 | e | 55.67 | l | 45.71 | 41.69 | i | 24.75 | k | 57.97 | i | ||
2017 | 19.98 | f | 28.69 | g | 40.15 | n | 42.91 | h | 55.31 | d | 59.86 | b | 68.15 | a | 71.65 | k | 59.15 | j | 44.94 | e | 37.03 | n | 29.43 | p | 57.07 | h |
2018 | 34.50 | x | 31.15 | r | 34.90 | p | 44.00 | e | 58.09 | i | 58.71 | k | 68.47 | n | 67.31 | m | 55.97 | k | 46.95 | j | 36.60 | i | 30.12 | r | 44.00 | k |
2019 | 31.86 | q | 23.29 | n | 32.48 | b | 45.48 | a | 54.59 | d | 58.57 | g | 63.10 | f | 67.12 | n | 57.89 | p | 41.86 | i | 35.17 | u | 31.50 | s | 44.19 | i |
2020 | 33.21 | l | 37.11 | o | 37.62 | c | 49.44 | n | 51.32 | n | 58.85 | f | 62.69 | o | 65.94 | v | 59.95 | s | 51.50 | k | 35.27 | s | 33.71 | s | 37.62 | k |
2021 | 34.35 | r | 28.05 | r | 40.14 | t | 42.40 | t | 51.43 | p | 66.12 | f | 70.50 | i | 68.14 | m | 58.64 | i | 46.66 | i | 38.62 | n | 29.67 | j | ----- | z |
2022 | 29.48 | h | ----- | z | 40.72 | h | 37.81 | i | 48.09 | n | 57.92 | k | 68.79 | j | 70.65 | n | 61.27 | o | 54.26 | l | 30.62 | m | 23.73 | k | ----- | z |
2023 | 30.80 | k | 29.41 | l | 33.24 | l | 43.26 | i | 58.76 | l | 60.39 | k | 69.25 | m | 68.62 | o | 59.08 | k | 50.50 | w | ----- | z | ----- | z | ----- | z |
2024 | ----- | z | ----- | z | 44.55 | t | 44.79 | i | 52.00 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 28.77 | 33.59 | 38.66 | 43.59 | 51.18 | 57.70 | 64.52 | 63.99 | 56.42 | 46.53 | 35.61 | 28.38 | 45.29 | |||||||||||||
S.D. | 4.64 | 2.47 | 2.83 | 2.79 | 2.65 | 2.85 | 3.05 | 3.19 | 3.56 | 2.36 | 3.47 | 3.99 | 0.91 | |||||||||||||
SKEW | -0.90 | -0.53 | -0.21 | -0.01 | -0.15 | 0.17 | -0.07 | -0.35 | -0.43 | 1.50 | -1.29 | -0.51 | 0.50 | |||||||||||||
MAX | 34.63 | 37.91 | 43.60 | 48.43 | 55.31 | 65.65 | 69.81 | 68.16 | 62.43 | 55.29 | 40.79 | 35.14 | 47.27 | |||||||||||||
MIN | 15.94 | 28.09 | 32.48 | 38.38 | 46.23 | 52.25 | 58.17 | 58.21 | 47.97 | 41.95 | 24.07 | 18.11 | 43.86 | |||||||||||||
YRS | 30 | 29 | 36 | 40 | 38 | 45 | 41 | 40 | 36 | 34 | 30 | 29 | 21 |