YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1973 | ----- | z | ----- | z | ----- | z | ----- | z | 44.77 | 49.63 | 58.94 | 54.23 | 43.77 | 35.03 | 29.63 | 24.81 | 42.60 | d | ||||||||
1974 | 16.35 | 24.29 | 29.06 | 34.25 | b | ----- | z | 52.53 | 55.17 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.30 | 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 | 51.29 | 47.67 | 39.63 | a | 20.57 | 22.42 | 36.32 | g | ||||
1994 | 25.45 | 21.57 | 31.94 | 37.34 | a | 45.03 | 50.38 | a | 60.48 | 58.84 | 49.97 | 35.32 | 23.40 | 18.29 | 38.17 | |||||||||||
1995 | 26.97 | 31.11 | 29.77 | 33.07 | 42.19 | 46.93 | 55.84 | 53.13 | 48.30 | 35.52 | 31.70 | 22.21 | c | 38.06 | ||||||||||||
1996 | 24.87 | 25.17 | 30.84 | 34.67 | 40.94 | 48.97 | a | 58.68 | 55.26 | 44.43 | 37.69 | b | 30.37 | 27.38 | b | 38.27 | ||||||||||
1997 | 22.42 | 24.29 | 31.43 | a | 32.80 | 46.97 | a | 49.70 | 54.26 | 56.61 | 48.24 | a | 34.97 | 30.14 | a | 19.83 | a | 37.64 | ||||||||
1998 | 28.03 | a | 26.85 | a | 30.19 | 34.23 | 39.97 | a | 46.60 | 60.55 | b | 58.33 | a | 50.48 | c | 35.39 | c | 29.07 | a | 18.10 | a | 38.15 | ||||
1999 | 24.97 | b | 24.93 | a | 27.90 | 31.59 | c | 40.48 | b | 47.63 | c | 55.21 | c | 55.63 | a | 45.59 | a | 36.68 | c | 32.67 | c | 21.03 | 37.03 | |||
2000 | 24.90 | 29.61 | a | 28.47 | a | 37.74 | c | 43.00 | b | 50.35 | d | 58.74 | d | 58.70 | d | 45.46 | d | 36.70 | d | 24.29 | b | 21.96 | f | 39.81 | a | |
2001 | 18.39 | 22.94 | l | 31.81 | 31.64 | b | 44.00 | d | 48.77 | d | 56.00 | b | 57.96 | d | 49.78 | c | 37.86 | b | 28.57 | b | 22.10 | b | 38.81 | a | ||
2002 | 22.57 | c | 23.61 | 27.28 | b | 36.66 | a | 40.29 | c | 51.07 | c | 61.40 | a | 52.96 | h | 47.57 | b | 34.41 | b | 26.23 | d | 26.85 | e | 36.18 | a | |
2003 | 29.15 | d | 23.84 | c | 32.54 | c | 32.36 | e | 42.67 | a | 51.18 | h | 63.62 | g | 58.90 | k | 48.89 | c | 41.05 | i | 24.40 | e | 27.52 | b | 32.67 | d |
2004 | 21.91 | i | 25.84 | d | 34.96 | c | 36.00 | c | 42.89 | c | 50.56 | e | 60.83 | g | 55.00 | m | 47.54 | b | 39.43 | h | 27.30 | g | 20.67 | m | 39.63 | f |
2005 | 20.55 | i | 24.94 | j | 32.18 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.87 | 27.24 | a | 23.04 | c | 28.72 | i | |
2006 | 26.10 | b | 20.69 | b | 26.94 | 35.86 | b | 42.63 | a | 51.77 | 62.65 | 53.83 | a | 44.24 | a | 33.83 | b | 28.44 | c | 17.83 | b | 37.07 | ||||
2007 | 13.41 | b | 25.75 | d | 32.71 | c | 33.44 | c | 44.73 | a | 51.68 | b | 62.84 | 56.32 | 44.14 | b | 34.85 | d | 27.41 | a | 21.38 | e | 37.39 | |||
2008 | 17.19 | e | 25.25 | a | 25.86 | b | 27.81 | c | 41.90 | b | 49.20 | 58.16 | 56.16 | 43.82 | s | 35.27 | e | 32.07 | 20.50 | a | 35.40 | a | ||||
2009 | 21.07 | d | 23.52 | a | 26.37 | l | 32.50 | 45.53 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.66 | h | |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.60 | 38.52 | b | 26.77 | 24.77 | 33.91 | h | |||
2011 | 20.10 | 23.68 | 29.74 | 31.52 | c | 36.84 | 45.38 | a | 54.69 | b | 58.04 | d | 48.41 | a | 35.40 | f | 23.58 | d | 14.70 | a | 35.15 | a | ||||
2012 | 19.94 | 22.54 | c | 31.48 | 36.07 | 40.94 | 46.37 | 61.77 | a | 57.17 | b | 48.17 | 36.69 | e | 30.03 | 22.55 | 37.81 | |||||||||
2013 | 9.52 | 24.86 | 28.19 | 35.60 | 40.52 | 50.17 | a | 62.30 | a | 57.17 | a | 49.87 | 32.23 | 25.80 | 11.42 | g | 37.84 | a | ||||||||
2014 | 21.00 | h | 29.64 | f | 29.29 | g | 33.89 | c | 40.63 | l | 50.38 | i | 63.00 | t | 55.27 | a | 48.07 | 38.87 | a | 25.05 | j | 27.37 | a | 40.69 | g | |
2015 | 23.00 | a | 30.22 | a | 31.43 | a | 32.60 | 42.10 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.31 | h | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.81 | 25.14 | 30.13 | 33.89 | 42.44 | 49.32 | 58.91 | 56.11 | 47.31 | 36.07 | 27.62 | 22.25 | 37.73 | |||||||||||||
S.D. | 5.13 | 2.74 | 2.32 | 2.37 | 2.42 | 2.03 | 2.97 | 2.11 | 2.13 | 1.85 | 3.25 | 3.62 | 0.48 | |||||||||||||
SKEW | -0.75 | 0.76 | 0.01 | -0.46 | -0.21 | -0.39 | -0.21 | -0.65 | -0.30 | 0.13 | -0.35 | -0.15 | -0.40 | |||||||||||||
MAX | 29.15 | 31.11 | 34.96 | 37.74 | 46.97 | 52.53 | 62.84 | 58.84 | 50.48 | 39.63 | 32.67 | 27.52 | 38.27 | |||||||||||||
MIN | 9.52 | 20.69 | 25.86 | 27.81 | 36.84 | 45.38 | 54.26 | 51.29 | 43.77 | 32.23 | 20.57 | 14.70 | 37.03 | |||||||||||||
YRS | 19 | 19 | 19 | 21 | 19 | 18 | 16 | 17 | 20 | 19 | 20 | 19 | 9 |