YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1977 | ----- | z | ----- | z | ----- | z | ----- | z | 47.77 | 67.13 | 75.25 | c | 69.74 | d | 59.65 | d | 53.55 | 39.72 | a | 38.73 | a | 56.44 | d | |||
1978 | 34.71 | 36.81 | a | 43.77 | 43.32 | b | 49.48 | f | 63.96 | d | 71.20 | a | 66.89 | d | 56.70 | c | 54.24 | b | 37.03 | a | ----- | z | 50.87 | b | ||
1979 | 26.87 | a | 30.48 | a | 39.07 | c | 47.52 | a | 53.10 | b | 62.21 | a | 71.17 | a | 65.65 | 62.59 | a | 50.06 | 35.73 | 32.90 | 48.11 | |||||
1980 | 34.97 | 38.79 | 37.58 | 44.97 | a | 48.42 | 62.30 | 70.45 | 68.45 | 60.03 | 49.65 | 40.27 | 37.28 | b | 49.43 | |||||||||||
1981 | 36.42 | 37.57 | 39.58 | 51.27 | 56.35 | 71.40 | 77.20 | a | 72.19 | 64.60 | 48.06 | 42.53 | 36.17 | b | 52.78 | |||||||||||
1982 | 30.67 | g | 35.44 | a | 38.97 | 46.38 | a | 53.10 | 61.36 | b | 69.10 | a | 68.79 | c | 58.83 | a | 43.11 | c | 35.37 | c | 30.65 | 49.19 | a | |||
1983 | 32.81 | 36.00 | a | 40.63 | a | 39.47 | 52.13 | 63.53 | 69.03 | 64.52 | 63.48 | a | 48.71 | 38.27 | 32.26 | 48.40 | ||||||||||
1984 | 29.83 | a | 31.90 | 39.68 | 42.47 | 60.03 | a | 61.10 | 66.67 | a | 63.77 | 59.70 | 40.13 | 35.59 | c | 28.83 | a | 46.64 | ||||||||
1985 | 27.04 | d | 29.18 | ----- | z | 48.07 | 54.39 | 65.80 | 70.57 | a | 70.30 | a | 55.97 | 47.33 | a | 35.00 | 31.43 | a | 48.64 | a | ||||||
1986 | 35.79 | c | 36.93 | 41.39 | c | 44.20 | 54.11 | c | 66.47 | 67.71 | 72.00 | 56.13 | 45.60 | a | ----- | z | 30.26 | 50.05 | a | |||||||
1987 | 26.90 | a | 31.93 | 36.93 | c | 47.59 | a | 51.93 | a | 63.53 | 67.29 | 68.07 | b | 59.17 | 50.14 | c | 36.40 | 26.00 | b | 47.16 | ||||||
1988 | 28.23 | a | 31.54 | a | 37.42 | 44.90 | a | 52.38 | b | 63.03 | a | 74.79 | b | 67.20 | a | 56.93 | a | 52.65 | 39.03 | 27.87 | 48.00 | |||||
1989 | 24.65 | 30.61 | 42.87 | a | 50.63 | 56.93 | c | 65.00 | 72.97 | 67.83 | a | 58.57 | 46.42 | 35.43 | 27.45 | 48.28 | ||||||||||
1990 | 27.41 | b | 27.43 | 40.45 | 47.41 | c | 53.77 | a | 65.88 | d | 70.93 | a | 67.50 | c | 61.31 | a | 48.39 | c | 35.38 | a | 22.55 | b | 47.37 | |||
1991 | 28.75 | c | 35.26 | a | 34.41 | b | 44.07 | 48.28 | b | 61.28 | a | 67.61 | 66.83 | b | 58.52 | a | 49.73 | a | 36.10 | 29.77 | a | 46.72 | ||||
1992 | 27.17 | a | 35.54 | a | 39.71 | 49.03 | 56.48 | 62.57 | 68.03 | a | 70.97 | a | 61.10 | 50.50 | a | 31.73 | 26.77 | a | 48.30 | |||||||
1993 | 30.00 | b | 34.15 | a | 38.32 | 45.18 | b | 54.97 | b | 57.66 | a | 68.87 | 65.45 | b | 57.86 | a | 47.90 | 30.86 | a | 26.71 | 46.49 | |||||
1994 | 29.13 | a | 29.00 | a | 39.65 | 47.08 | d | 53.16 | 69.93 | b | 72.47 | a | 72.28 | b | 62.07 | a | 45.97 | 28.57 | 28.07 | a | 48.11 | |||||
1995 | 32.36 | c | 36.78 | a | 37.79 | b | 41.07 | 49.31 | b | 55.77 | ----- | z | 73.13 | 61.37 | 45.29 | 37.82 | b | 30.84 | 45.59 | a | ||||||
1996 | 30.74 | 35.69 | 39.60 | a | 43.64 | b | 55.16 | 64.70 | 74.71 | 69.93 | a | 60.28 | a | 45.65 | 37.03 | 30.73 | a | 48.99 | ||||||||
1997 | 32.32 | c | 31.75 | 38.97 | 44.03 | 58.00 | a | 64.63 | 62.81 | 71.00 | a | 59.33 | 44.00 | 35.74 | c | 26.16 | 47.40 | |||||||||
1998 | 30.26 | 32.29 | 34.80 | a | 38.03 | a | 47.26 | 55.97 | 67.73 | a | 68.93 | a | 56.07 | c | 42.60 | a | 33.27 | 27.85 | d | 44.59 | ||||||
1999 | ----- | z | 30.92 | c | 37.13 | 37.60 | 49.56 | d | 62.93 | 67.77 | 63.55 | 56.97 | 46.71 | 36.47 | 27.61 | 47.02 | a | |||||||||
2000 | 31.90 | a | 34.43 | a | 36.62 | b | 47.83 | a | 56.97 | a | 64.64 | b | 71.48 | 70.87 | a | 58.87 | 46.50 | c | 29.19 | c | 29.75 | g | 49.94 | a | ||
2001 | 27.72 | b | 31.81 | a | 38.71 | 43.83 | a | 56.34 | b | 65.67 | c | 67.41 | i | 68.16 | f | 58.74 | g | 49.21 | c | 36.10 | i | 27.23 | i | 44.76 | e | |
2002 | 25.92 | e | 27.58 | d | 33.17 | b | 49.14 | b | 54.07 | a | 65.08 | e | 72.08 | g | 69.48 | f | 60.17 | a | 46.07 | c | 35.18 | h | 29.32 | f | 45.15 | d |
2003 | 32.00 | j | 32.08 | d | 37.27 | e | 41.38 | f | 51.39 | h | 65.00 | g | 73.68 | f | 70.54 | g | 59.19 | d | 52.21 | c | 33.38 | d | 27.89 | d | 40.34 | f |
2004 | 25.28 | f | 28.50 | e | 42.41 | d | 44.27 | 55.25 | g | 64.85 | d | 71.46 | c | 66.59 | b | 55.96 | c | 46.71 | c | 33.54 | f | 29.89 | d | 50.07 | c | |
2005 | 34.07 | c | 34.27 | b | 37.20 | f | 38.62 | f | 52.10 | j | 59.65 | m | 70.52 | h | 64.77 | i | 54.48 | g | 43.90 | k | 35.28 | e | 25.29 | g | 34.54 | i |
2006 | 27.38 | e | 30.05 | g | 33.48 | d | 40.46 | f | 53.74 | h | 66.00 | c | 70.85 | d | 66.78 | d | 55.42 | f | 42.89 | d | 35.79 | b | 27.30 | a | 46.31 | d |
2007 | 21.80 | a | 32.86 | 39.78 | d | 45.86 | a | 55.81 | d | 65.31 | a | 72.50 | c | 69.50 | e | 59.75 | b | 45.53 | a | 38.24 | a | 26.52 | 47.79 | |||
2008 | 25.12 | e | 29.34 | 36.33 | a | 38.28 | a | 47.68 | c | 62.96 | c | 72.14 | b | 70.93 | a | 59.10 | 46.27 | a | 39.04 | b | 28.39 | 46.30 | ||||
2009 | 28.31 | b | 29.81 | b | 35.25 | g | 41.75 | b | 58.81 | j | 58.36 | b | 72.37 | a | 67.42 | 61.13 | 44.11 | d | 37.20 | o | 26.25 | o | 50.41 | d | ||
2010 | 28.61 | m | 30.28 | j | 32.22 | v | ----- | z | 49.57 | a | 65.10 | a | 77.23 | 70.29 | 58.38 | a | 49.10 | 34.67 | 35.20 | a | 54.94 | d | ||||
2011 | 32.38 | g | 31.04 | d | 40.36 | i | 44.85 | d | 49.31 | b | 62.32 | e | 69.70 | d | 74.33 | m | 62.39 | b | 52.36 | t | 37.32 | b | 29.61 | c | 48.32 | d |
2012 | 31.47 | p | ----- | z | 40.84 | l | 48.30 | j | ----- | z | 68.93 | 69.90 | 70.19 | 63.69 | a | 55.61 | m | ----- | z | 35.12 | n | 68.18 | h | |||
2013 | 28.12 | g | 31.14 | g | 44.33 | j | 49.70 | 57.83 | b | 70.53 | 73.41 | b | 69.03 | a | 64.33 | u | 46.42 | 40.20 | 29.68 | 54.60 | d | |||||
2014 | ----- | z | 38.39 | 43.33 | j | 50.80 | 59.68 | 66.27 | 72.35 | 68.48 | 63.33 | 52.29 | 40.07 | 35.90 | 54.76 | b | ||||||||||
2015 | 36.52 | 40.29 | 46.97 | 47.93 | 55.45 | 70.27 | 68.52 | 73.13 | 66.07 | 58.87 | p | 33.69 | d | 31.56 | d | 51.85 | a | |||||||||
2016 | 32.33 | a | 33.94 | l | 43.22 | m | 48.90 | 53.93 | a | 70.60 | 76.10 | 69.54 | e | ----- | z | 50.67 | p | 40.77 | 33.80 | p | 56.02 | e | ||||
2017 | 32.86 | b | 39.79 | 45.35 | 47.13 | 54.61 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.95 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.01 | 33.32 | 38.99 | 45.38 | 53.47 | 64.34 | 70.92 | 68.79 | 59.86 | 47.53 | 36.21 | 29.96 | 47.83 | |||||||||||||
S.D. | 3.73 | 3.54 | 3.16 | 3.63 | 3.55 | 3.74 | 3.17 | 2.52 | 2.58 | 3.27 | 3.20 | 3.64 | 1.67 | |||||||||||||
SKEW | 0.03 | 0.22 | 0.43 | -0.49 | -0.18 | -0.26 | 0.01 | -0.24 | 0.38 | 0.09 | -0.43 | 0.67 | 1.10 | |||||||||||||
MAX | 36.52 | 40.29 | 46.97 | 51.27 | 60.03 | 71.40 | 77.23 | 73.13 | 66.07 | 54.24 | 42.53 | 38.73 | 52.78 | |||||||||||||
MIN | 21.80 | 27.43 | 33.17 | 37.60 | 47.26 | 55.77 | 62.81 | 63.55 | 55.96 | 40.13 | 28.57 | 22.55 | 44.59 | |||||||||||||
YRS | 31 | 35 | 31 | 35 | 34 | 38 | 35 | 35 | 35 | 35 | 34 | 32 | 18 |