YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1969 | ----- | z | ----- | z | 31.89 | 43.43 | 52.60 | 57.83 | 62.03 | 61.95 | 56.37 | 41.39 | 35.58 | 28.89 | 47.20 | b | ||||||||||
1970 | 26.48 | 32.43 | 33.37 | 36.98 | 48.90 | 60.30 | 64.06 | 63.73 | 49.31 | a | 41.16 | 34.82 | 21.08 | 42.72 | ||||||||||||
1971 | 25.02 | a | 29.72 | a | 29.58 | 41.13 | 51.87 | 53.72 | 63.34 | 66.87 | a | 49.65 | 42.23 | 33.73 | 22.43 | a | 42.44 | |||||||||
1972 | 21.93 | a | 26.39 | a | 38.26 | 39.57 | a | 51.26 | 57.38 | 62.47 | a | 64.35 | 50.47 | 44.92 | 34.76 | a | 19.97 | a | 42.64 | |||||||
1973 | 20.28 | a | 29.91 | 36.05 | 42.03 | 50.69 | 56.35 | 64.48 | e | 62.76 | 53.95 | 44.15 | 32.26 | a | 29.53 | a | 43.54 | |||||||||
1974 | 20.03 | a | 27.43 | 33.65 | 40.57 | 46.95 | 60.63 | 62.58 | a | 59.17 | h | 54.66 | e | 43.37 | 33.68 | 23.85 | 40.67 | a | ||||||||
1975 | 20.92 | 22.18 | 28.89 | 33.81 | a | 47.24 | 54.00 | 65.10 | 57.68 | 55.80 | 43.79 | 31.80 | 28.12 | a | 40.78 | |||||||||||
1976 | 23.61 | 25.55 | 29.13 | 40.50 | 50.56 | 53.15 | 63.06 | 58.58 | 56.44 | d | 45.55 | b | 40.79 | d | 26.48 | 42.78 | ||||||||||
1977 | 19.03 | 31.66 | 32.98 | b | 45.88 | 45.61 | 59.90 | 61.98 | 64.79 | 53.80 | 45.32 | 32.62 | 31.23 | a | 43.73 | |||||||||||
1978 | 29.18 | 32.64 | 41.48 | 42.13 | 47.63 | d | 56.50 | 63.61 | 60.84 | 53.07 | 46.65 | 31.07 | 19.98 | a | 43.73 | |||||||||||
1979 | 11.63 | 29.48 | 36.37 | a | 41.60 | d | 51.50 | f | 57.20 | 63.48 | a | 63.27 | a | 57.88 | 47.82 | a | 32.17 | a | 30.43 | k | 44.09 | b | ||||
1980 | 23.18 | a | 33.29 | a | 34.95 | a | 45.48 | a | 50.18 | 53.76 | a | 62.89 | c | 58.28 | a | 55.78 | a | 46.37 | 32.57 | h | 28.20 | a | 44.76 | a | ||
1981 | 30.92 | 30.09 | 37.61 | c | 43.67 | 49.10 | 55.07 | 61.31 | 65.98 | 56.09 | c | 43.03 | 36.37 | 29.15 | 44.86 | |||||||||||
1982 | 21.63 | 22.70 | 33.95 | 38.75 | 47.76 | 57.68 | b | 61.29 | c | 63.88 | b | 53.77 | 44.52 | a | 30.52 | b | 28.23 | e | 42.06 | |||||||
1983 | 30.98 | c | 32.43 | a | 38.46 | d | 40.59 | b | 50.68 | c | 54.48 | a | 59.28 | d | 65.14 | b | 53.33 | c | 46.70 | a | 35.54 | e | 18.33 | h | 46.15 | a |
1984 | 21.54 | d | 24.16 | 35.59 | b | 39.98 | b | 48.69 | d | 54.00 | c | 63.95 | b | 65.05 | c | 51.58 | d | 41.47 | a | 32.78 | c | 18.23 | g | 43.52 | a | |
1985 | 15.59 | b | 16.30 | 28.59 | c | 45.53 | 50.70 | d | 57.46 | b | 65.87 | a | 60.86 | b | 49.41 | b | 43.37 | a | 22.81 | i | 13.79 | b | 40.68 | a | ||
1986 | 24.31 | e | 33.22 | a | 40.66 | f | 42.70 | b | 50.79 | b | 62.23 | b | 59.26 | d | 67.25 | e | 50.77 | b | 46.93 | a | 36.00 | b | 26.38 | f | 47.35 | b |
1987 | 19.21 | g | 28.43 | a | 36.71 | g | 48.22 | 53.64 | b | 59.60 | d | 62.54 | c | 61.19 | b | 58.50 | b | 48.00 | c | 35.94 | d | 24.40 | b | 48.04 | b | |
1988 | 21.41 | d | 25.35 | e | 35.34 | i | 44.46 | e | 50.25 | a | 58.40 | f | 64.20 | c | 63.13 | e | 54.82 | e | 52.12 | b | 34.48 | d | 21.03 | b | 43.13 | b |
1989 | 20.02 | d | 17.35 | e | 34.11 | i | 45.96 | c | 49.04 | c | 58.02 | c | 63.83 | d | 59.81 | b | 54.35 | 44.06 | d | 36.26 | c | 27.94 | e | 43.33 | a | |
1990 | 27.33 | d | 25.52 | f | 38.62 | g | 49.33 | f | 47.86 | f | 54.98 | e | 64.82 | c | 63.75 | c | 60.50 | a | 45.03 | 35.28 | a | 17.91 | c | 46.20 | d | |
1991 | 21.77 | a | 36.13 | b | 35.68 | a | 41.50 | b | 47.40 | a | 52.88 | a | 64.78 | b | 66.24 | d | 58.16 | b | 45.39 | 33.10 | a | 28.33 | b | 44.28 | ||
1992 | 27.00 | d | 36.02 | b | 42.62 | a | 46.41 | c | 55.35 | 61.46 | e | 61.95 | b | 64.88 | c | 55.71 | a | 48.32 | c | 30.25 | b | 21.29 | c | 45.94 | ||
1993 | 15.90 | a | 21.75 | b | 34.62 | a | 40.90 | a | 55.40 | 54.43 | b | 54.43 | d | 60.23 | c | 55.44 | c | 48.00 | b | 29.04 | b | 26.79 | b | 41.41 | ||
1994 | 29.45 | c | 26.48 | c | 39.12 | a | 46.98 | 53.50 | 58.11 | b | 66.83 | b | 65.57 | a | 58.52 | a | 44.30 | a | 28.37 | 22.37 | a | 44.96 | ||||
1995 | 26.85 | 35.67 | j | 35.47 | 41.80 | b | 49.54 | c | 55.21 | a | 63.26 | 59.98 | 57.50 | 42.90 | 36.29 | d | 28.43 | a | 45.20 | a | ||||||
1996 | 25.60 | a | 25.45 | a | 37.45 | b | 43.28 | 46.65 | a | 56.59 | a | 65.52 | a | 63.10 | a | 52.29 | b | 45.08 | a | 35.69 | a | 26.80 | a | 43.62 | ||
1997 | 25.48 | a | 28.82 | 36.65 | a | 41.79 | b | 53.42 | 56.12 | 62.24 | 64.69 | 57.68 | 44.09 | b | 37.33 | 25.03 | a | 44.45 | ||||||||
1998 | 26.97 | 29.56 | b | 34.85 | 42.21 | b | 49.50 | c | 55.62 | 67.98 | 64.97 | 61.43 | c | 44.11 | c | 35.77 | b | 23.48 | d | 44.70 | ||||||
1999 | 26.10 | a | 24.75 | b | 32.61 | 39.32 | b | 48.38 | g | 54.10 | e | 61.05 | b | 64.98 | a | 55.07 | a | 47.36 | c | 40.66 | e | 24.86 | c | 42.81 | a | |
2000 | 25.11 | c | 31.59 | a | 34.36 | b | 45.78 | a | 50.68 | 58.06 | d | 63.76 | 64.78 | b | 54.00 | 44.83 | d | 28.17 | a | 24.85 | k | 45.56 | a | |||
2001 | 19.23 | e | 26.38 | d | 36.91 | i | 38.83 | j | 50.33 | j | 54.86 | h | 63.50 | k | 67.06 | o | 58.90 | j | 44.88 | k | 35.21 | b | 22.10 | b | 25.73 | h |
2002 | ----- | z | 22.94 | l | 34.73 | p | 43.11 | k | 49.37 | 58.18 | 66.35 | 59.27 | a | 55.50 | 42.48 | b | 33.20 | 30.05 | a | 49.30 | d | |||||
2003 | 31.14 | c | 29.21 | 38.03 | 41.60 | a | 48.68 | a | 58.58 | 67.82 | 66.25 | a | 56.72 | a | 49.13 | 30.87 | 29.20 | c | 45.60 | |||||||
2004 | 23.39 | 27.24 | 39.79 | 46.12 | a | 49.72 | a | 57.75 | 64.52 | a | 64.23 | a | 54.00 | a | 46.27 | 35.43 | 28.05 | a | 44.71 | |||||||
2005 | 26.13 | a | 30.09 | 38.77 | a | 42.35 | 50.78 | a | 52.78 | a | 65.15 | 65.00 | 53.55 | 46.18 | 32.34 | a | 20.48 | a | 43.63 | |||||||
2006 | 25.57 | c | 25.23 | 33.92 | 42.88 | 50.95 | a | 61.35 | m | 69.08 | e | 63.09 | c | 56.64 | b | 45.23 | a | 34.72 | a | 23.82 | 42.83 | a | ||||
2007 | 20.56 | 32.27 | 39.84 | b | 42.73 | 51.44 | 58.43 | 69.82 | 63.63 | 55.75 | 43.44 | 33.91 | b | 22.77 | 44.55 | |||||||||||
2008 | 19.07 | b | 27.81 | 31.02 | 37.79 | a | 49.27 | 54.68 | 64.24 | 64.15 | 56.00 | 47.02 | 37.42 | 25.02 | a | 42.79 | ||||||||||
2009 | 23.55 | a | 27.36 | 32.36 | b | 41.25 | 50.06 | 56.77 | 64.74 | 64.80 | a | 60.38 | 41.44 | 33.67 | 21.48 | a | 43.16 | |||||||||
2010 | 29.50 | 32.21 | 36.13 | 40.17 | 44.35 | 54.72 | 62.48 | 62.93 | a | 57.20 | 47.98 | b | 35.70 | c | 27.58 | 44.25 | ||||||||||
2011 | 24.97 | b | 28.71 | b | 33.74 | 38.10 | 44.89 | c | ----- | z | 63.72 | v | 66.63 | 60.50 | 47.42 | 32.02 | 26.03 | 40.30 | b | |||||||
2012 | 26.61 | 29.84 | 36.84 | 43.91 | b | 48.27 | 55.00 | 67.10 | 66.56 | 58.73 | 45.79 | 38.57 | i | 26.66 | 45.94 | a | ||||||||||
2013 | 16.56 | 29.80 | 36.44 | 43.38 | 51.03 | 57.97 | 68.81 | 67.61 | 58.82 | b | 44.53 | 34.37 | 21.56 | d | 44.24 | |||||||||||
2014 | 25.60 | 31.88 | c | 38.87 | 43.48 | 51.53 | 56.22 | 69.71 | 66.23 | 59.23 | 50.08 | 34.69 | c | 30.77 | 46.52 | |||||||||||
2015 | 29.17 | b | 36.78 | c | 42.62 | a | 42.95 | 52.79 | 64.22 | 66.23 | 66.37 | 57.12 | 52.10 | a | 32.39 | b | 23.79 | 47.21 | ||||||||
2016 | 24.52 | a | 31.12 | 38.37 | 49.10 | 51.82 | 59.53 | 63.42 | 64.87 | 55.68 | 46.69 | 39.73 | 16.74 | d | 45.13 | |||||||||||
2017 | 16.54 | f | 30.89 | a | 39.25 | a | 41.52 | 51.00 | 58.38 | a | 68.92 | a | 67.61 | 58.72 | 44.55 | 36.05 | 24.32 | k | 49.69 | b | ||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.80 | 28.62 | 35.72 | 42.40 | 50.03 | 56.89 | 64.16 | 63.78 | 55.64 | 45.47 | 34.19 | 24.78 | 43.94 | |||||||||||||
S.D. | 4.38 | 4.38 | 3.53 | 2.99 | 2.44 | 2.61 | 2.93 | 2.57 | 2.98 | 2.53 | 2.81 | 4.01 | 1.47 | |||||||||||||
SKEW | -0.48 | -0.67 | -0.16 | -0.17 | -0.09 | 0.55 | -0.38 | -0.71 | -0.30 | 0.56 | 0.07 | -0.54 | 0.04 | |||||||||||||
MAX | 31.14 | 36.78 | 42.62 | 49.10 | 55.40 | 64.22 | 69.82 | 67.61 | 61.43 | 52.12 | 40.79 | 31.23 | 47.21 | |||||||||||||
MIN | 11.63 | 16.30 | 28.59 | 33.81 | 44.35 | 52.78 | 54.43 | 57.68 | 49.31 | 41.16 | 28.17 | 13.79 | 40.78 | |||||||||||||
YRS | 45 | 45 | 42 | 46 | 45 | 45 | 47 | 47 | 48 | 48 | 46 | 43 | 28 |