YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.26 | l | 52.35 | 46.97 | 28.71 | 24.17 | 16.52 | 33.74 | g | |||||
1953 | 8.77 | 6.89 | 19.29 | 27.67 | 37.27 | a | 51.00 | 53.81 | 57.26 | 46.27 | 40.83 | a | 27.17 | 11.68 | 32.32 | |||||||||||
1954 | 1.23 | 18.04 | 12.61 | 29.43 | 36.19 | 52.47 | 54.74 | 51.39 | 45.37 | 35.00 | 26.50 | 15.48 | 31.54 | |||||||||||||
1955 | 4.26 | 2.89 | 8.77 | 35.77 | 41.84 | 51.40 | 58.87 | 57.90 | 47.10 | 38.84 | 16.67 | 4.06 | 30.70 | |||||||||||||
1956 | 6.06 | 4.52 | 13.19 | 27.63 | 38.42 | 52.60 | 51.71 | 52.65 | 41.97 | 41.40 | a | 24.10 | 10.97 | 30.43 | ||||||||||||
1957 | -2.77 | 4.25 | 12.81 | 30.43 | 40.32 | 49.03 | 55.74 | 53.97 | 44.30 | 36.35 | 25.30 | 11.87 | 30.13 | |||||||||||||
1958 | 11.32 | 1.71 | 16.77 | 31.10 | 37.94 | 44.86 | a | 53.16 | 52.32 | 48.63 | 38.06 | 24.23 | 1.68 | 30.15 | ||||||||||||
1959 | -5.10 | 0.54 | 16.00 | 28.93 | 41.81 | 52.73 | 56.16 | 57.84 | 47.67 | 34.65 | 14.00 | 19.00 | 30.35 | |||||||||||||
1960 | 5.97 | 7.14 | a | 4.84 | 34.67 | f | 40.23 | 47.33 | 52.84 | 55.97 | 47.83 | 37.35 | 27.40 | 6.35 | 30.30 | a | ||||||||||
1961 | 1.74 | 13.21 | 21.13 | 28.33 | 36.97 | 48.57 | 53.65 | 54.71 | 47.20 | 38.29 | 24.93 | 8.97 | 31.47 | |||||||||||||
1962 | -0.61 | 1.61 | 18.06 | 27.40 | 44.10 | 47.93 | a | 52.84 | 53.39 | 44.69 | a | 38.83 | a | 28.80 | 8.48 | 30.46 | ||||||||||
1963 | -5.00 | -2.68 | 16.94 | 29.87 | 39.03 | 50.97 | 56.35 | 51.94 | 47.07 | 45.87 | 28.60 | 3.32 | 30.19 | |||||||||||||
1964 | 13.10 | 9.28 | 12.45 | 30.07 | 45.74 | 48.77 | 56.39 | 51.81 | 45.07 | 36.94 | 25.27 | 3.37 | a | 31.52 | ||||||||||||
1965 | -2.19 | -4.19 | b | 0.33 | y | 29.19 | c | 44.07 | a | 48.48 | a | 51.97 | 52.87 | 42.93 | 37.84 | 23.17 | 18.26 | 31.13 | a | |||||||
1966 | -4.35 | 5.75 | 21.29 | 28.93 | 36.71 | 52.07 | 58.19 | 53.94 | 46.13 | 35.45 | 22.60 | 10.65 | 30.61 | |||||||||||||
1967 | 5.71 | -4.04 | 17.74 | 29.47 | 34.35 | 49.00 | 53.17 | a | 51.87 | 46.40 | 35.19 | 21.43 | 12.42 | 29.39 | ||||||||||||
1968 | 2.26 | 1.00 | 22.03 | 31.37 | 38.68 | 47.53 | 54.84 | 52.26 | 48.43 | 40.16 | 24.43 | 8.52 | 30.96 | |||||||||||||
1969 | 4.87 | 5.25 | 9.48 | 30.73 | 39.84 | 44.47 | 52.32 | 56.20 | a | 47.47 | 34.84 | 23.93 | a | 14.23 | 30.30 | |||||||||||
1970 | -3.06 | -0.25 | 10.65 | 30.48 | a | 38.23 | a | 49.48 | a | 57.16 | 53.55 | 46.47 | 38.94 | 23.67 | 7.94 | 29.44 | ||||||||||
1971 | -4.26 | 3.68 | 11.65 | 28.17 | 36.10 | 51.40 | 52.35 | 49.70 | a | 47.34 | a | 42.81 | 25.27 | 9.68 | 29.49 | |||||||||||
1972 | -7.25 | c | -3.76 | 9.00 | 24.20 | 42.61 | 45.77 | 53.00 | 52.27 | a | 42.00 | 33.29 | 24.73 | 5.80 | a | 26.81 | ||||||||||
1973 | 8.13 | 6.89 | a | 24.84 | 28.90 | a | 36.87 | a | 50.90 | 54.97 | 57.10 | 45.20 | 41.29 | 24.67 | 8.45 | 32.35 | ||||||||||
1974 | 2.67 | a | 1.21 | 16.94 | 27.03 | 38.94 | 45.41 | h | 56.87 | a | 51.68 | 39.32 | b | 37.33 | a | 26.30 | 16.97 | 28.66 | a | |||||||
1975 | 6.61 | 7.96 | 13.84 | 23.53 | 42.71 | 51.27 | 56.17 | h | 53.29 | g | 42.72 | a | 38.16 | 25.63 | 8.19 | 26.06 | b | |||||||||
1976 | -0.39 | 14.52 | 16.74 | 33.87 | 36.97 | 50.70 | 52.74 | 53.81 | 42.33 | ----- | z | ----- | z | ----- | z | 33.48 | c | |||||||||
1977 | -8.03 | 9.39 | 24.61 | 33.23 | 47.58 | 49.63 | 55.50 | q | 49.07 | a | 47.30 | 36.13 | 24.90 | 9.30 | a | 29.37 | a | |||||||||
1978 | -1.45 | 0.29 | 13.06 | 27.93 | a | 41.58 | 48.50 | 55.03 | 53.73 | a | 50.39 | b | 37.61 | 21.10 | 4.00 | 29.32 | ||||||||||
1979 | -6.87 | -3.54 | 17.39 | 27.93 | 37.35 | 47.23 | 55.23 | a | 52.84 | 47.80 | 33.81 | 25.00 | 15.68 | 29.15 | ||||||||||||
1980 | 3.23 | 0.68 | g | 12.17 | a | 32.93 | c | 42.45 | 48.63 | 56.87 | 57.10 | 45.62 | a | 33.58 | 26.24 | a | 7.23 | 33.28 | a | |||||||
1981 | 4.87 | 11.64 | 19.45 | 32.77 | 38.48 | 51.03 | 55.87 | 56.84 | 45.00 | a | 34.55 | 29.37 | 13.84 | 32.81 | ||||||||||||
1982 | -8.03 | a | 1.72 | c | 18.00 | 27.97 | a | 44.39 | c | 42.75 | b | 55.48 | 50.41 | b | 45.71 | b | 39.37 | d | 23.59 | c | 19.06 | 30.04 | ||||
1983 | 11.33 | a | 19.04 | 22.71 | 27.46 | b | 37.29 | 47.81 | c | 61.07 | b | 59.52 | 49.93 | a | 36.97 | 27.66 | a | -1.43 | a | 33.28 | ||||||
1984 | 0.03 | b | 17.56 | b | 8.52 | b | 30.83 | a | 38.45 | 51.45 | a | 53.47 | a | 56.61 | c | 44.21 | a | 42.53 | a | 26.96 | b | 11.13 | 31.81 | |||
1985 | 3.23 | a | 4.07 | 24.32 | 33.27 | 41.00 | b | 46.79 | a | 50.00 | c | 52.23 | 46.14 | b | 34.52 | 18.64 | b | -1.43 | c | 29.40 | ||||||
1986 | 3.82 | c | 3.88 | d | 20.75 | c | 33.75 | b | 37.13 | 44.41 | a | 56.56 | d | 48.78 | h | 43.88 | e | 37.93 | b | 22.64 | e | 15.86 | b | 29.15 | a | |
1987 | 14.90 | 18.00 | b | 23.15 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.68 | i | |
1988 | 0.42 | -2.59 | 16.83 | a | 28.69 | a | 44.06 | 52.07 | 57.37 | a | 57.40 | a | 47.80 | 31.42 | 26.38 | a | 7.84 | 30.64 | ||||||||
1989 | 8.97 | -3.46 | 11.35 | 28.33 | 38.87 | 47.93 | 56.13 | 55.65 | 45.87 | 36.29 | 18.48 | a | -3.35 | 28.42 | ||||||||||||
1990 | 12.97 | 7.00 | 20.77 | 33.41 | a | 36.13 | 51.53 | 51.23 | 51.97 | 44.63 | 32.81 | 26.70 | 8.65 | 31.48 | ||||||||||||
1991 | 0.23 | 10.93 | 19.03 | 34.13 | 46.71 | 52.20 | 56.35 | 55.61 | 45.87 | 33.52 | 18.37 | 11.00 | 32.00 | |||||||||||||
1992 | 9.35 | 13.97 | 16.90 | 29.10 | 42.68 | 47.67 | 50.03 | 50.90 | b | 43.50 | 33.39 | c | 23.37 | 10.45 | 30.94 | |||||||||||
1993 | 4.97 | 4.25 | 13.53 | a | 28.13 | 40.55 | 48.33 | 56.68 | 55.93 | a | 40.40 | 30.13 | a | 20.55 | a | 14.57 | c | 29.84 | ||||||||
1994 | -8.83 | b | -2.19 | b | 18.57 | a | 28.73 | 39.07 | c | 49.80 | 54.03 | b | 52.27 | a | 49.25 | b | 39.16 | 26.40 | 16.19 | 30.20 | ||||||
1995 | 7.23 | 4.43 | 19.13 | a | 26.17 | 39.17 | b | 52.31 | a | 56.23 | a | 57.50 | a | 42.96 | c | 37.55 | 13.60 | 5.83 | a | 30.18 | ||||||
1996 | -5.63 | a | -0.14 | 8.63 | a | 22.21 | a | 36.52 | 49.86 | a | 52.87 | a | 54.29 | 48.07 | a | 35.39 | 18.23 | 8.42 | 27.39 | |||||||
1997 | 0.23 | 6.00 | 15.23 | a | 27.18 | b | 34.90 | 52.23 | 55.06 | 50.90 | 47.36 | b | 36.23 | 20.50 | 18.39 | 30.35 | ||||||||||
1998 | 11.42 | 23.25 | 16.71 | 31.07 | a | 42.42 | 50.21 | a | 55.06 | 55.48 | b | 48.72 | a | 36.42 | 27.83 | 12.10 | 34.22 | |||||||||
1999 | 1.19 | 13.86 | 15.81 | 31.27 | 43.53 | a | 52.07 | 58.39 | 53.84 | 46.10 | 32.10 | b | 29.07 | 13.90 | 32.59 | |||||||||||
2000 | 2.69 | b | 14.33 | b | 23.03 | 27.50 | t | 40.97 | 46.43 | 53.07 | a | 54.57 | a | 43.63 | 38.16 | 25.79 | a | -1.32 | 31.03 | a | ||||||
2001 | 8.58 | -1.82 | 11.94 | 32.28 | a | 42.84 | 50.37 | 51.33 | a | 54.42 | 43.63 | 33.42 | 31.87 | 17.16 | 31.33 | |||||||||||
2002 | 9.03 | 12.25 | 5.81 | 26.70 | 34.55 | 49.33 | 54.16 | 52.52 | 45.47 | 28.61 | 20.60 | 11.97 | 29.25 | |||||||||||||
2003 | -1.71 | -4.18 | 10.58 | 23.80 | 35.94 | 46.83 | 52.32 | 54.68 | 45.57 | 33.10 | 20.87 | 12.42 | 27.52 | |||||||||||||
2004 | -3.39 | 6.38 | 18.71 | 25.93 | 35.42 | 44.83 | 50.90 | a | 46.77 | 50.03 | 36.68 | 25.60 | 7.24 | b | 28.76 | |||||||||||
2005 | 0.16 | 9.39 | 8.94 | 31.70 | 36.33 | m | ----- | z | ----- | z | 53.10 | 47.30 | 37.65 | e | 24.40 | 10.23 | 24.76 | c | ||||||||
2006 | 15.26 | -1.79 | 12.61 | 31.80 | 41.87 | 47.55 | a | 56.94 | 53.39 | 42.87 | 28.37 | a | 25.72 | a | 16.77 | 30.95 | ||||||||||
2007 | 6.06 | -5.54 | b | 18.94 | 25.47 | 43.23 | 52.40 | 54.81 | 52.94 | 44.69 | a | 37.45 | 21.13 | 5.90 | a | 29.79 | ||||||||||
2008 | 4.87 | a | -1.85 | b | 5.84 | 25.33 | 33.87 | 47.10 | a | 52.03 | 48.94 | 44.77 | 33.81 | 19.60 | -0.87 | a | 26.12 | |||||||||
2009 | -9.37 | a | 3.78 | a | 13.94 | 27.53 | 35.77 | 46.33 | 48.65 | 50.26 | 48.34 | a | 31.32 | 27.80 | 4.63 | a | 27.42 | |||||||||
2010 | 3.94 | -1.15 | a | 19.41 | b | 29.63 | 41.24 | b | 49.03 | 57.13 | 55.45 | 43.17 | r | 35.90 | 26.73 | 9.97 | a | 29.75 | a | |||||||
2011 | 2.03 | 6.00 | 14.19 | 31.23 | 38.70 | a | 48.57 | 59.86 | c | 55.33 | a | 46.33 | 40.28 | b | 26.00 | a | 17.53 | a | 32.17 | |||||||
2012 | 10.29 | 15.96 | d | 31.90 | b | 28.79 | b | 43.59 | b | 52.74 | c | 58.96 | d | 52.80 | a | 44.00 | b | 33.87 | 24.59 | a | 16.03 | a | 34.46 | |||
2013 | 6.86 | b | 4.14 | 9.39 | 21.22 | c | 38.45 | b | 49.62 | f | 54.67 | a | 55.17 | a | 48.00 | 38.17 | b | 21.64 | b | 0.43 | c | 27.10 | a | |||
2014 | -5.13 | -3.31 | b | 5.10 | b | 25.41 | a | 40.84 | 51.07 | b | 55.52 | b | 54.63 | a | 47.25 | f | 35.55 | b | 16.00 | 15.13 | a | 26.44 | a | |||
2015 | 5.55 | -4.07 | a | 19.40 | a | 28.57 | b | 41.52 | b | 48.67 | c | 56.97 | 54.69 | b | 53.96 | f | 34.21 | c | 31.24 | a | 22.97 | b | 30.88 | a | ||
2016 | 7.87 | 11.83 | 24.24 | b | 30.07 | a | 40.20 | a | 50.76 | a | 57.60 | a | 58.23 | 52.10 | ----- | z | ----- | z | ----- | z | 36.99 | c | ||||
2017 | ----- | z | ----- | z | ----- | z | 29.69 | a | 36.00 | a | 49.63 | c | 52.96 | h | 49.25 | g | 46.85 | c | 35.04 | h | 20.50 | 4.29 | 31.16 | f | ||
2018 | 2.55 | b | -1.18 | 12.48 | f | 21.60 | j | 41.38 | b | 48.81 | i | 53.65 | e | 53.71 | c | 44.61 | l | 31.42 | e | 16.30 | 15.87 | 26.71 | d | |||
2019 | 1.93 | a | -3.65 | e | 13.82 | t | 24.00 | v | 35.97 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 11.42 | i |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 2.66 | 4.84 | 15.84 | 29.10 | 39.67 | 49.26 | 54.78 | 53.82 | 45.92 | 36.12 | 23.83 | 10.10 | 30.43 | |||||||||||||
S.D. | 6.14 | 7.05 | 5.59 | 2.98 | 3.21 | 2.42 | 2.55 | 2.53 | 2.44 | 3.48 | 3.93 | 5.93 | 1.76 | |||||||||||||
SKEW | -0.04 | 0.56 | 0.13 | -0.27 | 0.29 | -0.50 | -0.01 | -0.13 | -0.20 | 0.04 | -0.60 | -0.28 | -0.12 | |||||||||||||
MAX | 15.26 | 23.25 | 31.90 | 35.77 | 47.58 | 52.74 | 61.07 | 59.52 | 52.10 | 45.87 | 31.87 | 22.97 | 34.46 | |||||||||||||
MIN | -9.37 | -5.54 | 4.84 | 21.22 | 33.87 | 42.75 | 48.65 | 46.77 | 39.32 | 28.37 | 13.60 | -3.35 | 26.12 | |||||||||||||
YRS | 66 | 65 | 63 | 62 | 65 | 61 | 61 | 63 | 62 | 63 | 64 | 64 | 48 |