YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | 47.17 | s | 46.87 | 56.10 | 53.00 | 44.63 | 34.35 | 21.17 | 12.90 | 38.43 | e | |||||||
1952 | 15.26 | 15.28 | 18.03 | 32.90 | 40.19 | 48.33 | 53.32 | 52.97 | 45.70 | 36.39 | 17.83 | 13.77 | 32.50 | |||||||||||||
1953 | 18.32 | 15.71 | 23.23 | 28.00 | 35.13 | 47.13 | 54.10 | 49.16 | 44.97 | a | 37.03 | 28.37 | 16.06 | 33.10 | ||||||||||||
1954 | 20.29 | 27.04 | 24.40 | a | 36.70 | 42.03 | 48.17 | 56.00 | 51.42 | 47.93 | 37.45 | 28.37 | 15.10 | 36.24 | ||||||||||||
1955 | 11.10 | 9.71 | 21.87 | a | 28.47 | 36.90 | 45.33 | 52.45 | 53.48 | 45.63 | 36.61 | 22.87 | 19.07 | a | 31.96 | |||||||||||
1956 | 21.74 | 14.90 | 22.48 | 29.33 | 40.23 | 49.17 | 51.35 | 48.71 | 45.77 | 34.42 | 19.20 | 14.48 | 32.65 | |||||||||||||
1957 | 16.55 | 23.68 | 25.35 | 28.40 | 35.74 | 46.97 | a | 50.74 | 50.00 | 42.67 | 34.81 | 19.53 | 17.61 | 32.67 | ||||||||||||
1958 | 12.88 | f | 23.35 | h | 22.27 | a | 27.43 | 39.77 | 48.27 | 49.97 | 51.26 | 41.50 | 31.77 | 18.60 | 16.94 | 34.78 | b | |||||||||
1959 | 10.16 | 12.54 | 16.23 | 26.79 | a | 33.94 | 44.50 | 48.71 | 47.03 | a | 37.80 | 35.13 | 21.28 | a | 17.65 | 29.31 | ||||||||||
1960 | 8.68 | 7.16 | d | 23.74 | h | 33.63 | 36.68 | 47.87 | g | 51.71 | 50.74 | 45.97 | 30.94 | 22.59 | a | 10.37 | a | 29.85 | b | |||||||
1961 | 8.16 | 18.71 | 25.29 | 29.48 | c | 38.39 | 51.83 | 52.81 | 53.97 | 39.27 | 32.16 | 23.70 | ----- | z | 33.98 | a | ||||||||||
1962 | ----- | z | ----- | z | ----- | z | 34.63 | 36.00 | 45.57 | ----- | z | 49.03 | 41.93 | 34.10 | 25.76 | a | ----- | z | 38.15 | e | ||||||
1963 | ----- | z | ----- | z | ----- | z | 27.62 | v | 38.19 | e | 42.10 | 51.10 | 49.03 | 43.22 | c | 32.88 | o | 27.57 | 16.61 | 38.26 | e | |||||
1964 | 12.37 | a | 12.17 | 17.30 | a | 29.87 | 40.42 | 47.30 | 55.84 | 51.29 | 44.43 | 36.90 | 22.33 | 15.71 | 32.16 | |||||||||||
1965 | ----- | z | 17.46 | 22.03 | 31.10 | 36.68 | 43.33 | 52.55 | 51.26 | 38.17 | 36.84 | 30.00 | 19.40 | a | 34.44 | a | ||||||||||
1966 | 13.06 | 10.61 | 26.03 | 30.43 | 40.03 | 46.33 | 54.16 | 51.35 | 44.40 | 32.77 | 26.50 | 17.00 | 32.72 | |||||||||||||
1967 | 14.19 | 20.21 | 27.84 | 28.70 | 38.10 | 45.97 | 56.97 | 53.35 | 46.93 | 35.42 | 26.40 | 10.25 | c | 33.69 | ||||||||||||
1968 | 9.62 | b | 21.64 | a | 25.10 | 28.33 | 38.29 | 47.47 | 53.13 | 49.42 | 43.07 | 35.97 | 24.90 | 12.90 | 32.49 | |||||||||||
1969 | 20.84 | 18.39 | 20.10 | 33.27 | 42.90 | 46.68 | b | 56.58 | 55.77 | a | 47.73 | 32.97 | 25.70 | 21.70 | a | 35.22 | ||||||||||
1970 | 17.80 | a | 23.96 | b | 23.84 | 27.07 | 41.32 | 48.20 | 54.45 | 56.10 | b | 43.53 | 33.55 | 27.23 | 16.69 | b | 34.48 | |||||||||
1971 | 15.53 | a | 20.11 | 23.53 | a | 31.47 | 37.68 | 48.70 | c | 56.13 | a | 54.45 | b | 42.79 | b | 34.23 | 22.63 | 14.26 | 33.46 | |||||||
1972 | 17.03 | 23.00 | a | 28.87 | 32.33 | 39.32 | 49.00 | 54.90 | a | 52.03 | 45.37 | 39.33 | a | 22.20 | 10.13 | 34.46 | ||||||||||
1973 | 7.58 | 16.11 | 22.87 | 27.33 | 40.84 | 48.36 | b | 56.00 | a | 53.68 | 45.15 | c | 36.07 | a | 25.50 | 17.13 | a | 33.05 | ||||||||
1974 | 8.06 | 11.54 | 28.94 | 28.83 | a | 39.97 | 49.43 | b | 53.80 | a | 49.93 | b | 45.10 | a | 39.00 | a | 26.17 | 15.94 | 33.06 | |||||||
1975 | 13.07 | a | 16.19 | a | 25.03 | 29.21 | a | 36.28 | b | 43.90 | 53.03 | b | 49.00 | 45.25 | b | 34.65 | 21.07 | c | 18.35 | 32.09 | ||||||
1976 | 14.13 | a | 25.48 | 22.61 | 31.17 | 39.23 | a | 45.50 | 53.47 | a | 50.35 | 45.33 | 32.35 | 24.93 | 16.06 | 33.39 | ||||||||||
1977 | 12.27 | a | 20.96 | 19.45 | 33.04 | c | 39.58 | 52.77 | 57.30 | a | 55.26 | 49.27 | 38.03 | 28.17 | a | 22.07 | c | 35.68 | ||||||||
1978 | 18.19 | 16.14 | 29.29 | 33.83 | a | 38.63 | a | 48.60 | 54.10 | 51.45 | 46.37 | 39.03 | 28.33 | 9.14 | i | 36.72 | a | |||||||||
1979 | 9.42 | 11.96 | 22.42 | 30.67 | 38.81 | 46.27 | 52.57 | a | 50.97 | a | 46.80 | 37.20 | a | 18.11 | c | 18.83 | a | 32.00 | ||||||||
1980 | 18.63 | a | 19.71 | a | 19.52 | 30.77 | 37.42 | 46.97 | 53.47 | a | 51.86 | b | 45.67 | 35.54 | c | 25.43 | 26.13 | a | 34.26 | |||||||
1981 | 21.40 | a | 19.61 | 25.29 | 34.55 | a | 37.97 | a | 50.97 | a | 55.69 | b | 51.45 | b | 47.10 | 34.82 | c | 26.57 | 18.71 | c | 35.34 | |||||
1982 | 11.77 | a | 17.21 | 27.21 | g | 30.10 | 39.57 | a | 46.43 | b | 52.60 | a | 54.10 | 47.47 | 31.63 | a | 25.93 | a | 16.11 | d | 33.90 | a | ||||
1983 | 16.43 | c | 19.15 | b | 24.37 | d | 28.68 | b | 37.47 | a | 47.23 | d | 54.80 | a | 54.42 | 46.90 | a | 36.16 | 23.33 | c | 16.58 | 33.79 | ||||
1984 | 11.29 | 15.29 | a | 24.35 | e | 28.00 | d | 41.86 | b | 45.18 | b | 55.23 | 54.06 | 45.96 | d | 31.27 | a | 22.90 | 19.81 | 32.93 | ||||||
1985 | 14.87 | a | 11.33 | a | 24.68 | 34.32 | b | 39.46 | c | 47.76 | a | 54.93 | a | 51.61 | c | 41.50 | 35.53 | a | 23.90 | 18.63 | a | 33.21 | ||||
1986 | 23.86 | b | 23.78 | a | 29.53 | a | 30.79 | b | 37.55 | b | 47.37 | 52.87 | a | 54.00 | d | 42.43 | 32.57 | a | 25.60 | 19.39 | 34.98 | |||||
1987 | 13.32 | 21.39 | 22.07 | a | 33.62 | a | 39.47 | a | 47.27 | 51.77 | 51.29 | 42.55 | a | 36.61 | 24.21 | a | 13.88 | e | 33.12 | |||||||
1988 | 8.48 | 14.41 | 21.81 | 31.73 | 37.23 | 47.65 | d | 52.68 | 51.71 | 41.70 | c | 38.16 | 22.89 | c | 12.68 | c | 31.76 | |||||||||
1989 | 7.10 | a | 16.04 | 27.77 | a | 33.07 | b | 39.30 | a | 44.93 | a | 53.74 | 49.57 | a | 44.57 | 32.60 | a | 23.73 | 15.37 | a | 32.32 | |||||
1990 | 11.86 | b | 16.27 | b | 27.33 | a | 34.03 | a | 35.94 | 49.32 | e | 53.77 | 50.90 | 48.33 | 33.68 | 24.60 | 5.69 | b | 32.64 | |||||||
1991 | 7.17 | a | 16.26 | a | 23.03 | b | 26.96 | b | 34.74 | 43.12 | d | 52.50 | a | 52.23 | 45.27 | 35.45 | 23.00 | 13.90 | 31.14 | |||||||
1992 | 9.27 | a | 18.48 | b | 28.06 | 34.68 | b | 39.26 | 43.96 | d | 50.04 | e | 50.34 | b | 44.07 | 37.39 | c | 20.70 | 12.14 | b | 32.37 | |||||
1993 | 17.17 | b | 18.96 | a | 26.27 | a | 31.48 | a | 39.10 | a | 43.89 | b | 49.55 | 51.08 | e | 41.83 | f | 32.69 | b | 20.52 | a | 14.67 | d | 31.40 | a | |
1994 | 17.00 | a | 13.93 | 27.47 | a | 32.70 | 38.14 | b | 49.36 | h | 52.37 | a | 54.04 | c | 45.43 | 33.06 | 19.57 | b | 20.20 | a | 32.17 | a | ||||
1995 | 17.50 | a | 26.82 | 28.04 | c | 29.48 | c | 35.94 | 42.63 | ----- | z | 53.79 | b | 45.67 | c | 32.61 | 25.90 | 18.75 | c | 32.47 | a | |||||
1996 | 15.55 | 22.59 | 23.67 | a | 30.10 | 42.33 | d | 49.35 | g | 55.97 | 54.23 | 42.78 | c | 34.67 | a | 25.79 | b | 17.15 | d | 33.16 | a | |||||
1997 | 16.26 | 15.64 | 23.10 | 28.57 | 40.67 | a | 45.76 | a | 51.33 | a | 52.03 | a | 48.14 | a | 31.86 | b | 25.10 | a | 13.93 | a | 32.70 | |||||
1998 | 16.90 | 17.14 | 22.26 | 28.76 | a | 37.93 | b | 42.23 | 56.03 | b | 53.52 | b | 46.76 | a | 35.48 | b | 25.79 | a | 16.59 | b | 33.28 | |||||
1999 | 20.80 | a | 21.32 | 26.39 | c | 26.47 | 36.23 | 44.76 | a | 54.03 | a | 52.78 | d | 42.87 | 33.77 | a | 26.57 | 17.24 | b | 33.60 | ||||||
2000 | 19.23 | 23.86 | a | 25.21 | b | 33.10 | a | 41.47 | a | 49.77 | 52.15 | d | 54.48 | 45.36 | b | 35.84 | 18.00 | 19.11 | c | 34.80 | ||||||
2001 | 15.55 | 19.36 | 28.06 | 31.46 | b | 40.71 | 46.73 | d | 54.10 | 53.06 | 45.18 | b | 35.48 | 25.87 | 12.21 | c | 33.98 | |||||||||
2002 | 12.06 | 13.81 | a | 20.97 | a | 34.23 | 37.43 | a | 49.79 | a | 55.60 | a | 51.27 | a | 46.00 | 33.07 | a | 23.83 | a | 16.57 | c | 32.89 | ||||
2003 | 23.16 | 18.72 | c | 22.90 | a | 29.07 | a | 40.65 | 49.33 | 56.35 | 54.63 | d | 44.53 | 38.77 | 25.22 | c | 18.19 | d | 35.13 | |||||||
2004 | 11.48 | 13.55 | 28.93 | b | 32.83 | 39.39 | 47.48 | c | 52.59 | b | 50.74 | 45.69 | d | 37.50 | g | 26.88 | e | 21.00 | 33.69 | a | ||||||
2005 | 26.42 | 25.36 | 25.48 | 31.60 | 39.94 | 45.07 | 54.81 | 52.77 | a | 47.27 | 37.13 | a | 27.60 | 17.13 | 35.88 | |||||||||||
2006 | 18.97 | 18.71 | 24.32 | 31.70 | 40.77 | a | 50.77 | 57.89 | c | 53.17 | a | 43.37 | 36.52 | 31.40 | 21.19 | 35.73 | ||||||||||
2007 | 18.00 | c | 21.07 | 27.94 | 32.83 | 40.59 | b | 48.86 | a | 56.97 | b | 54.21 | c | 47.68 | e | 35.06 | 26.37 | 15.58 | 35.43 | |||||||
2008 | 6.59 | b | 15.89 | a | 22.46 | c | 27.10 | 35.14 | b | 46.34 | a | 55.03 | a | 54.63 | a | 45.37 | 35.71 | 28.23 | 17.89 | d | 32.53 | |||||
2009 | 17.35 | 20.18 | 25.57 | a | 28.87 | 43.37 | a | 48.15 | c | 54.94 | 52.70 | a | 46.80 | 31.77 | 27.50 | 11.28 | f | 36.11 | a | |||||||
2010 | 13.90 | 15.30 | a | 22.90 | 30.27 | 35.67 | a | 48.69 | a | 55.23 | 53.90 | 47.26 | c | 38.29 | 23.53 | 25.22 | d | 34.18 | ||||||||
2011 | 7.06 | m | 16.77 | b | 26.07 | q | 30.66 | a | 36.39 | 46.70 | 55.19 | 55.03 | 47.70 | 36.03 | a | 25.00 | b | 16.89 | c | 36.64 | b | |||||
2012 | 19.58 | 20.66 | 27.65 | 34.27 | 42.77 | 51.80 | 56.74 | 56.35 | 47.47 | 35.97 | a | 27.57 | 17.78 | d | 36.55 | |||||||||||
2013 | 10.55 | 17.43 | 28.06 | 31.13 | 39.50 | a | 51.82 | b | 57.84 | 55.13 | 48.75 | b | 34.13 | a | 27.19 | c | 13.45 | 34.58 | ||||||||
2014 | 20.29 | 24.14 | 26.65 | 30.90 | 39.52 | 48.30 | 57.06 | 53.16 | 49.83 | 39.29 | 24.22 | c | 22.33 | a | 36.31 | |||||||||||
2015 | 22.19 | 24.36 | 29.26 | 31.50 | 37.74 | 50.54 | b | 53.77 | 54.81 | 49.43 | 41.77 | 25.33 | 15.26 | 36.33 | ||||||||||||
2016 | 12.52 | 20.28 | 27.39 | c | 31.93 | 38.58 | 52.77 | d | 54.40 | a | 53.14 | b | 46.21 | b | 38.87 | 30.03 | 18.52 | 35.39 | ||||||||
2017 | 19.41 | b | 26.89 | 29.55 | 30.77 | 38.81 | 50.76 | a | 56.52 | 53.26 | 48.20 | 34.79 | c | 29.62 | d | 21.10 | 36.64 | |||||||||
2018 | 20.06 | 22.11 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.09 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.12 | 18.35 | 24.63 | 30.85 | 38.75 | 47.39 | 54.06 | 52.40 | 45.21 | 35.29 | 24.66 | 16.73 | 33.73 | |||||||||||||
S.D. | 4.77 | 4.50 | 3.17 | 2.40 | 2.13 | 2.54 | 2.12 | 2.03 | 2.51 | 2.35 | 3.11 | 3.55 | 1.58 | |||||||||||||
SKEW | 0.05 | -0.07 | -0.43 | 0.11 | -0.04 | 0.02 | -0.33 | -0.29 | -0.75 | 0.24 | -0.37 | -0.14 | -0.01 | |||||||||||||
MAX | 26.42 | 27.04 | 29.55 | 36.70 | 43.37 | 52.77 | 57.89 | 56.35 | 49.83 | 41.77 | 31.40 | 26.13 | 36.64 | |||||||||||||
MIN | 6.59 | 7.16 | 16.23 | 26.47 | 33.94 | 42.10 | 48.71 | 47.03 | 37.80 | 30.94 | 17.83 | 5.69 | 29.31 | |||||||||||||
YRS | 62 | 64 | 61 | 65 | 66 | 64 | 65 | 67 | 66 | 65 | 67 | 63 | 51 |