YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1973 | ----- | z | ----- | z | ----- | z | ----- | z | 61.53 | 66.35 | 75.85 | 71.52 | a | 61.07 | 50.15 | 38.43 | 34.47 | 57.42 | d | |||||||
1974 | 27.11 | 35.68 | 40.27 | 47.02 | b | ----- | z | 70.07 | 71.56 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.03 | g | ||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.05 | 62.42 | 51.90 | a | 32.90 | 31.00 | a | 48.85 | g | |||
1994 | 35.63 | 32.57 | 43.58 | g | 50.48 | e | 57.56 | 65.53 | a | 75.65 | 74.21 | 64.87 | 48.81 | 32.20 | 27.23 | a | 51.34 | a | ||||||||
1995 | 33.90 | 43.55 | 40.53 | 44.67 | 53.55 | a | 60.33 | 70.44 | 69.26 | 64.07 | 50.16 | 44.87 | 30.88 | c | 50.52 | |||||||||||
1996 | 33.79 | 34.48 | 43.17 | a | 46.84 | b | 53.39 | 63.19 | a | 74.37 | 71.42 | 59.15 | 50.90 | b | 41.13 | 35.89 | c | 50.64 | ||||||||
1997 | 31.89 | 34.79 | 43.88 | a | 44.38 | 60.40 | a | 63.08 | 69.74 | 71.65 | 62.79 | a | 48.43 | a | 41.03 | a | 29.53 | b | 50.13 | |||||||
1998 | 37.52 | a | 35.02 | b | 41.77 | a | 45.10 | 50.20 | a | 59.10 | 75.41 | b | 73.37 | a | 63.74 | c | 48.27 | c | 38.03 | a | 27.60 | a | 49.59 | |||
1999 | 34.64 | c | 34.24 | a | 39.79 | 43.96 | d | 53.59 | b | 62.30 | c | 71.14 | c | 70.35 | a | 61.02 | a | 53.18 | c | 45.29 | d | 32.27 | 50.15 | |||
2000 | 33.61 | 38.61 | a | 40.62 | b | 51.67 | c | 56.24 | b | 66.44 | d | 74.15 | d | 74.11 | d | 60.56 | d | 49.65 | d | 33.19 | c | 32.27 | g | 52.62 | a | |
2001 | 27.34 | 32.78 | l | 43.06 | 43.77 | b | 59.44 | d | 64.27 | d | 71.00 | b | 74.31 | d | 64.91 | c | 52.90 | b | 41.17 | c | 30.41 | b | 52.05 | a | ||
2002 | 31.12 | c | 34.89 | 38.67 | b | 49.53 | a | 53.57 | c | 65.83 | c | 76.95 | a | 68.87 | h | 62.41 | b | 47.88 | b | 38.37 | d | 36.48 | e | 48.70 | a | |
2003 | 38.08 | e | 35.22 | c | 44.07 | c | 43.54 | e | 55.40 | a | 66.66 | h | 79.02 | g | 72.62 | k | 64.26 | c | 55.93 | i | 33.84 | e | 34.98 | b | 43.67 | d |
2004 | 29.45 | i | 33.84 | d | 47.32 | c | 49.17 | c | 55.50 | c | 65.34 | e | 75.15 | h | 68.58 | m | 61.95 | b | 52.20 | i | 37.00 | g | 31.22 | m | 52.19 | f |
2005 | 29.10 | j | 36.08 | j | 47.68 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.10 | 38.91 | b | 31.84 | c | 40.62 | i | |
2006 | 35.12 | b | 33.29 | b | 36.89 | 47.20 | b | 57.81 | b | 67.52 | 78.61 | 70.53 | a | 61.74 | a | 50.12 | b | 39.37 | c | 28.98 | b | 50.60 | ||||
2007 | 26.53 | b | 37.15 | d | 46.50 | c | 46.72 | c | 60.38 | a | 66.93 | b | 78.90 | 73.35 | 60.61 | b | 48.57 | d | 40.66 | a | 29.52 | e | 51.32 | |||
2008 | 26.12 | e | 35.71 | a | 38.74 | b | 42.85 | c | 55.36 | c | 64.28 | 75.00 | 73.06 | 62.27 | s | 51.06 | e | 43.78 | 30.67 | b | 48.79 | a | ||||
2009 | 32.12 | f | 34.41 | a | 39.24 | l | 46.43 | a | 60.32 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.05 | i |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.66 | a | 50.77 | c | 37.08 | 32.98 | 45.87 | h | ||
2011 | 30.26 | 34.04 | 39.92 | 42.46 | c | 49.03 | 58.69 | a | 70.81 | b | 73.94 | d | 66.31 | a | 51.29 | g | 35.79 | d | 29.16 | b | 48.22 | a | ||||
2012 | 32.13 | 34.50 | d | 42.55 | 49.78 | 55.65 | 62.32 | 76.52 | a | 74.43 | b | 65.87 | 53.22 | f | 41.52 | 31.40 | 51.51 | a | ||||||||
2013 | 19.90 | 35.04 | 42.18 | 48.78 | 55.47 | 65.05 | b | 78.00 | a | 72.59 | b | 62.35 | 46.44 | 38.97 | 24.09 | h | 51.34 | a | ||||||||
2014 | 34.59 | h | 41.52 | f | 42.85 | g | 48.35 | c | 55.68 | l | 65.19 | i | 78.18 | t | 70.88 | a | 63.83 | 53.78 | a | 38.45 | j | 35.73 | a | 54.52 | g | |
2015 | 32.97 | a | 42.30 | c | 46.23 | a | 47.32 | 54.40 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.20 | h | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.54 | 35.75 | 42.01 | 46.67 | 56.02 | 64.26 | 74.53 | 72.06 | 62.83 | 50.22 | 38.83 | 31.63 | 50.42 | |||||||||||||
S.D. | 4.63 | 2.86 | 2.88 | 2.66 | 3.45 | 2.97 | 3.05 | 2.23 | 1.89 | 1.96 | 3.83 | 2.80 | 0.54 | |||||||||||||
SKEW | -0.82 | 1.74 | 0.24 | 0.10 | -0.19 | -0.26 | -0.23 | -1.14 | 0.07 | 0.07 | -0.16 | 0.30 | 0.15 | |||||||||||||
MAX | 38.08 | 43.55 | 47.32 | 51.67 | 61.53 | 70.07 | 78.90 | 74.43 | 66.31 | 53.78 | 45.29 | 36.48 | 51.32 | |||||||||||||
MIN | 19.90 | 32.57 | 36.89 | 42.46 | 49.03 | 58.69 | 69.74 | 66.05 | 59.15 | 46.44 | 32.20 | 27.23 | 49.59 | |||||||||||||
YRS | 18 | 19 | 18 | 21 | 19 | 18 | 16 | 17 | 20 | 18 | 20 | 19 | 7 |