YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.33 | j | ----- | z | 51.73 | i | 41.80 | 29.50 | c | 14.80 | b | -21.65 | 16.11 | h | ||
1955 | ----- | z | -7.08 | o | 7.59 | b | 23.53 | 39.77 | 50.60 | a | 58.45 | a | 50.15 | a | 40.83 | 22.61 | d | -15.36 | a | -16.48 | a | 26.17 | b | |||
1956 | -26.52 | a | -12.60 | 5.48 | b | 28.97 | a | 42.94 | 52.84 | a | 57.80 | a | 52.85 | 39.35 | 17.48 | b | 0.48 | a | -30.53 | b | 19.05 | |||||
1957 | -8.52 | b | -5.67 | b | ----- | z | 28.70 | 43.84 | 57.45 | 55.94 | 56.75 | a | 41.23 | 25.33 | a | 12.85 | -16.88 | c | 26.46 | a | ||||||
1958 | -9.95 | a | -7.56 | a | 11.63 | 32.86 | a | ----- | z | ----- | z | 59.95 | b | 52.82 | 41.84 | a | 14.22 | b | -1.28 | a | -14.26 | 18.03 | b | |||
1959 | -25.15 | a | 1.95 | -0.69 | 27.09 | a | 44.73 | a | 57.45 | 54.95 | 52.84 | 43.46 | b | 19.72 | a | 0.98 | b | -10.77 | 22.21 | |||||||
1960 | -8.68 | 6.39 | b | 2.77 | 28.00 | a | 48.47 | 49.93 | 53.85 | 51.53 | 40.70 | b | 25.93 | b | -1.38 | -4.02 | 24.46 | |||||||||
1961 | -12.48 | -7.62 | -1.70 | a | 23.63 | 45.07 | c | 52.82 | h | 56.90 | 53.85 | a | 42.63 | 21.11 | -6.15 | -26.97 | 17.12 | a | ||||||||
1962 | -11.56 | 1.88 | 7.06 | 30.02 | 42.23 | 54.28 | 59.68 | a | 55.45 | a | 40.33 | 29.31 | b | 4.62 | b | -8.25 | a | 25.42 | ||||||||
1963 | -5.44 | e | 4.38 | b | 8.67 | j | 26.45 | i | 47.75 | c | 52.73 | h | 61.23 | 58.60 | a | ----- | z | 24.42 | -13.93 | -10.48 | a | 20.82 | d | |||
1964 | -20.18 | 8.18 | a | 1.02 | a | 30.94 | n | 36.71 | n | 51.98 | 45.75 | a | ----- | z | ----- | z | ----- | z | 3.48 | -27.45 | a | 8.97 | e | |||
1965 | -28.23 | -20.72 | a | 29.89 | 30.37 | 47.16 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 11.69 | g | ||||
1966 | -31.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | -31.87 | k | |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.12 | r | 23.74 | 8.71 | a | -8.43 | a | 8.01 | i | |
1968 | -12.82 | -1.36 | 12.65 | 26.83 | 44.56 | 52.98 | 58.92 | 52.17 | b | 39.38 | 18.45 | -0.48 | -24.02 | 22.27 | ||||||||||||
1969 | -35.32 | -11.09 | 11.81 | 33.25 | 43.68 | a | 56.73 | 54.47 | 45.53 | 42.58 | 28.37 | -2.84 | a | -6.44 | 21.73 | |||||||||||
1970 | -24.23 | 3.55 | 21.76 | 27.85 | 43.68 | 50.26 | a | 55.40 | 52.32 | 38.32 | 15.45 | 4.85 | -16.94 | 22.69 | ||||||||||||
1971 | -37.60 | -4.73 | -1.37 | 25.60 | 39.34 | 53.88 | 57.94 | 51.71 | 40.95 | 22.00 | a | -5.43 | -12.22 | a | 19.17 | |||||||||||
1972 | -28.30 | a | -16.32 | a | -2.32 | 20.14 | e | 43.14 | i | 53.71 | d | ----- | z | 53.73 | a | 36.70 | 24.05 | -0.52 | a | -10.74 | b | 13.01 | b | |||
1973 | -26.16 | -11.46 | 10.74 | 33.03 | 41.70 | f | 52.86 | a | 56.88 | b | 51.03 | a | 37.89 | k | 19.98 | c | -14.22 | -13.90 | a | 15.88 | b | |||||
1974 | -27.27 | -14.72 | a | 4.71 | b | 28.10 | 42.87 | a | 53.62 | r | 56.68 | 53.44 | 43.16 | b | 20.07 | d | -3.67 | c | -10.12 | f | 20.34 | b | ||||
1975 | -26.27 | c | -13.20 | a | 8.06 | e | 26.52 | a | ----- | z | ----- | z | ----- | z | 50.79 | g | 43.72 | c | 21.40 | a | -9.93 | b | -22.61 | 3.46 | d | |
1976 | -15.18 | a | -9.46 | q | 7.67 | a | 30.17 | a | 42.45 | 53.67 | l | 58.65 | 55.21 | 40.65 | 19.18 | 6.57 | ----- | z | 27.26 | c | ||||||
1977 | ----- | z | 5.27 | 8.98 | 29.78 | a | 43.56 | 53.67 | c | 57.13 | 58.44 | 43.53 | 22.35 | -12.55 | -23.56 | d | 26.06 | a | ||||||||
1978 | ----- | z | -2.37 | b | ----- | z | 30.54 | d | 43.84 | b | ----- | z | 59.44 | 54.50 | 43.94 | c | 19.87 | -0.72 | -4.48 | 27.17 | c | |||||
1979 | ----- | z | -34.27 | b | 7.56 | n | 30.77 | d | ----- | z | 53.33 | o | 58.46 | r | 56.10 | a | 42.15 | 27.52 | 12.23 | b | -17.00 | 16.79 | e | |||
1980 | -19.46 | h | 2.17 | b | 14.81 | b | 31.58 | 44.63 | ----- | z | 57.63 | 51.69 | b | 39.14 | a | 26.32 | 4.53 | -42.58 | f | 30.28 | c | |||||
1981 | 3.71 | ----- | z | 18.08 | 25.20 | 49.79 | 51.73 | 56.10 | 52.52 | a | 38.77 | 22.27 | a | 4.78 | a | -13.55 | a | 28.13 | a | |||||||
1982 | -29.33 | e | -9.44 | b | 6.59 | c | 24.68 | 40.93 | a | 53.66 | a | 58.57 | a | 51.27 | 44.08 | 14.48 | a | -3.17 | -5.57 | c | 20.56 | |||||
1983 | -17.82 | f | -2.09 | 8.67 | a | 31.30 | 43.67 | a | 55.47 | a | 56.94 | 51.08 | a | 38.48 | b | 22.26 | 0.77 | b | -14.98 | b | 26.50 | a | ||||
1984 | -8.98 | c | -7.24 | b | 21.00 | b | 32.33 | c | 41.03 | a | 55.10 | 56.50 | 53.58 | a | 43.40 | 21.64 | c | 2.64 | b | -9.94 | e | 25.09 | ||||
1985 | 7.87 | -11.28 | a | 12.26 | 23.47 | a | 43.86 | c | 51.76 | a | 56.58 | 51.35 | 41.57 | a | 18.32 | c | -9.32 | b | 3.48 | a | 24.16 | |||||
1986 | -3.52 | g | -1.77 | d | 7.07 | c | 22.47 | 47.03 | a | 57.91 | a | 57.52 | 49.42 | 42.97 | a | 27.10 | b | -10.96 | b | 6.34 | c | 27.74 | a | |||
1987 | -3.20 | c | 6.02 | a | 9.35 | 34.07 | c | 45.85 | a | 56.10 | a | 61.28 | b | 55.58 | a | 42.23 | b | 27.57 | b | 3.93 | c | -6.16 | c | 27.72 | ||
1988 | -12.02 | e | -0.56 | b | 16.98 | a | 34.30 | b | 46.76 | 58.52 | b | 63.20 | a | 51.94 | 39.00 | a | 16.68 | i | -1.54 | d | -2.70 | f | 29.66 | b | ||
1989 | -25.43 | a | -6.27 | 4.98 | a | 36.66 | b | 44.64 | b | 55.05 | 60.85 | 54.94 | 47.12 | d | 24.65 | a | -5.93 | a | 0.86 | c | 24.34 | |||||
1990 | ----- | z | -21.63 | a | 13.81 | 36.18 | 51.40 | a | 57.42 | 58.82 | a | 55.60 | 43.80 | g | 20.17 | a | -12.45 | b | -11.21 | c | 24.81 | b | ||||
1991 | -9.93 | c | 2.75 | b | 10.73 | a | ----- | z | 46.89 | ----- | z | ----- | z | 52.52 | 46.97 | a | 20.60 | a | -2.95 | a | -12.90 | a | 17.19 | c | ||
1992 | -4.22 | a | -7.39 | b | ----- | z | 25.84 | a | ----- | z | 58.48 | a | ----- | z | 50.55 | 31.46 | e | 15.74 | d | 3.45 | a | -11.38 | b | 18.06 | c | |
1993 | -7.29 | e | -0.20 | 16.23 | 37.00 | a | 52.82 | 59.03 | 61.42 | 54.39 | 43.66 | b | 27.52 | a | 2.93 | b | -7.98 | c | 28.29 | |||||||
1994 | -6.05 | -14.06 | a | 16.66 | 34.29 | b | 43.21 | ----- | z | 59.05 | 63.47 | b | 41.74 | a | 22.75 | c | -3.39 | c | -13.25 | e | 22.22 | a | ||||
1995 | -10.91 | c | 3.44 | a | -1.71 | c | 36.33 | ----- | z | ----- | z | 59.26 | 53.94 | d | ----- | z | 24.89 | -7.64 | a | -9.17 | e | 16.49 | c | |||
1996 | -24.58 | f | -0.86 | a | 13.00 | ----- | z | ----- | z | ----- | z | 62.59 | d | 51.37 | a | 39.45 | a | 10.65 | -8.02 | -21.98 | 18.27 | d | ||||
1997 | -20.84 | c | 6.59 | a | 3.92 | 30.60 | a | 46.53 | 57.10 | a | 62.78 | a | 53.29 | b | 43.60 | 12.93 | a | 8.23 | -6.36 | b | 24.87 | |||||
1998 | -12.12 | e | 1.39 | 14.15 | 35.77 | 47.90 | 56.70 | 60.10 | 52.60 | 42.68 | 18.10 | 2.57 | -14.88 | a | 25.41 | |||||||||||
1999 | -20.00 | a | -16.59 | 8.05 | 32.25 | 42.79 | 57.80 | 59.63 | 56.37 | 42.92 | 23.52 | -4.32 | -9.13 | 22.77 | ||||||||||||
2000 | -14.63 | 9.24 | 18.10 | 30.27 | 42.71 | 56.80 | 58.87 | 49.56 | 41.45 | 18.00 | 5.88 | a | -6.10 | 25.85 | ||||||||||||
2001 | -0.31 | 2.00 | 11.89 | 36.48 | 42.39 | 57.78 | 58.73 | 55.90 | 44.03 | a | 21.84 | 6.58 | k | -16.00 | a | 28.61 | a | |||||||||
2002 | -0.70 | a | -3.93 | 4.88 | a | 23.24 | a | 46.11 | 56.21 | a | 60.26 | 52.53 | a | 43.67 | 31.41 | c | 15.78 | g | 0.60 | 28.57 | a | |||||
2003 | -4.85 | d | 10.70 | a | 8.56 | 30.65 | 45.00 | c | 54.95 | 61.33 | a | 53.40 | 37.60 | 26.41 | b | 3.17 | -14.32 | 26.05 | ||||||||
2004 | -22.10 | f | 2.74 | 7.73 | 33.17 | 50.56 | 62.62 | 62.03 | 57.65 | 35.50 | a | 25.08 | a | 2.47 | -6.98 | a | 30.23 | a | ||||||||
2005 | -11.95 | -3.88 | 20.08 | 33.07 | a | 51.63 | 55.32 | 58.27 | 54.84 | 44.36 | a | 25.33 | b | -4.45 | a | -1.41 | b | 26.77 | ||||||||
2006 | -18.03 | -1.24 | a | 0.82 | 27.74 | a | 45.15 | a | 55.18 | 58.57 | a | 51.27 | 44.82 | 26.79 | -17.07 | -6.98 | 22.25 | |||||||||
2007 | -8.82 | -8.75 | -6.55 | a | 31.47 | 45.48 | 57.88 | 60.53 | 56.11 | 42.97 | 20.40 | 8.47 | -11.22 | a | 24.00 | |||||||||||
2008 | -14.02 | d | -10.06 | b | 14.50 | 31.00 | 43.52 | a | 53.93 | 54.53 | b | 49.82 | 46.50 | k | 15.98 | -1.30 | -17.06 | 20.08 | a | |||||||
2009 | -17.73 | -4.68 | 4.95 | 31.52 | 47.39 | 55.70 | 62.71 | 53.97 | 43.68 | 26.26 | -2.68 | -7.21 | g | 27.37 | a | |||||||||||
2010 | -7.23 | c | 1.96 | 11.58 | 34.03 | 48.60 | a | 54.97 | 58.58 | 56.53 | 41.63 | 25.13 | 11.20 | -14.00 | 26.92 | |||||||||||
2011 | -12.60 | -6.43 | 1.21 | 29.72 | 47.56 | 54.98 | 57.53 | 51.35 | 42.95 | 24.27 | -8.05 | 1.63 | 23.68 | |||||||||||||
2012 | -25.35 | a | 4.57 | a | 6.87 | 36.23 | 43.42 | 55.50 | 57.06 | 54.13 | 45.35 | 18.74 | b | -12.83 | -24.18 | 21.63 | ||||||||||
2013 | -6.35 | -1.02 | 6.50 | 15.27 | 41.73 | 59.68 | 60.00 | ----- | z | 41.83 | 33.03 | 1.23 | -16.31 | 21.42 | a | |||||||||||
2014 | 3.74 | -10.46 | 9.90 | 30.27 | 46.81 | 51.93 | 57.30 | a | 52.78 | a | 41.40 | 21.95 | a | 3.27 | ----- | z | 28.08 | a | ||||||||
2015 | -11.24 | -5.09 | 13.58 | 34.40 | a | 51.21 | 56.66 | a | 58.60 | 51.34 | 41.07 | 28.77 | 3.75 | -5.82 | 26.43 | |||||||||||
2016 | 4.05 | 3.29 | 21.79 | 38.90 | 47.97 | a | 57.23 | 60.34 | 56.21 | 43.77 | 16.29 | 2.43 | -13.95 | a | 28.19 | |||||||||||
2017 | -13.52 | -3.20 | -1.35 | a | 32.47 | 44.90 | b | 60.13 | 61.19 | 55.85 | d | ----- | z | ----- | z | ----- | z | ----- | z | 29.56 | d | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -14.23 | -4.02 | 9.20 | 30.17 | 45.34 | 55.49 | 58.46 | 53.50 | 41.71 | 22.36 | -1.00 | -11.96 | 24.15 | |||||||||||||
S.D. | 10.67 | 8.56 | 7.20 | 4.65 | 3.07 | 2.72 | 2.83 | 2.80 | 2.74 | 4.72 | 7.42 | 7.92 | 2.54 | |||||||||||||
SKEW | -0.16 | -0.89 | 0.26 | -0.68 | 0.46 | 0.03 | -1.54 | 0.53 | -1.09 | -0.17 | -0.19 | -0.09 | -0.26 | |||||||||||||
MAX | 7.87 | 10.70 | 29.89 | 38.90 | 52.82 | 62.62 | 63.20 | 63.47 | 47.12 | 33.03 | 14.80 | 6.34 | 28.29 | |||||||||||||
MIN | -37.60 | -34.27 | -6.55 | 15.27 | 39.34 | 49.93 | 45.75 | 45.53 | 31.46 | 10.65 | -17.07 | -30.53 | 19.05 | |||||||||||||
YRS | 52 | 58 | 56 | 57 | 52 | 47 | 55 | 57 | 54 | 59 | 59 | 55 | 27 |