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 | ----- | z | 67.16 | h | 73.52 | 67.98 | 61.15 | 47.85 | 32.82 | 23.13 | 51.08 | f | ||||||
1952 | 25.16 | 26.16 | 28.53 | 45.93 | 55.48 | 64.48 | 69.95 | 69.50 | 62.53 | 54.08 | 30.50 | 24.76 | 46.42 | |||||||||||||
1953 | 29.39 | 26.88 | 36.50 | 42.45 | 49.34 | 65.35 | 70.63 | 65.16 | 62.57 | a | 49.84 | 39.32 | 25.84 | 46.94 | ||||||||||||
1954 | 30.37 | 37.73 | 35.22 | a | 51.13 | 57.11 | 64.07 | 72.05 | 67.73 | 61.80 | 51.35 | 41.43 | 26.10 | 49.67 | ||||||||||||
1955 | 22.56 | 21.34 | 33.73 | a | 41.90 | 52.08 | a | 61.18 | 69.68 | 69.29 | 62.62 | 52.21 | 35.08 | 30.22 | a | 45.99 | ||||||||||
1956 | 32.27 | 26.14 | a | 36.53 | 43.83 | 56.45 | 66.78 | 69.03 | 65.61 | 63.82 | 49.81 | 32.10 | 26.27 | 47.39 | ||||||||||||
1957 | 25.95 | 34.88 | 36.60 | a | 41.00 | 48.26 | 62.00 | a | 67.02 | 65.19 | 59.33 | 47.03 | 29.95 | 29.47 | 45.56 | |||||||||||
1958 | 26.92 | g | 35.38 | h | 32.98 | a | 41.57 | 57.32 | 66.75 | 68.95 | 69.32 | 59.05 | 49.40 | 35.37 | 32.92 | 51.36 | b | |||||||||
1959 | 26.71 | 26.16 | 31.94 | 44.19 | a | 52.21 | 64.95 | 69.42 | 65.93 | a | 57.07 | 50.21 | 34.86 | a | 29.92 | 46.13 | ||||||||||
1960 | 21.34 | 20.10 | d | 36.46 | h | 46.77 | 53.50 | 67.36 | h | 70.84 | 69.39 | 63.10 | 44.76 | 36.05 | a | 22.48 | a | 44.83 | b | |||||||
1961 | 23.08 | 30.46 | 35.71 | 43.81 | c | 54.10 | 69.13 | 70.45 | 69.21 | 54.42 | 46.74 | 34.63 | ----- | z | 48.34 | a | ||||||||||
1962 | ----- | z | ----- | z | ----- | z | 49.20 | 52.81 | 64.03 | ----- | z | 68.37 | 60.23 | 48.79 | 39.00 | a | ----- | z | 54.63 | e | ||||||
1963 | ----- | z | ----- | z | ----- | z | 44.38 | v | 57.52 | e | 61.80 | 71.18 | 65.84 | 61.74 | c | 49.81 | o | 40.08 | 28.92 | 55.30 | e | |||||
1964 | 24.60 | a | 26.00 | 29.22 | a | 41.88 | 54.50 | 63.48 | 72.39 | 66.47 | 59.35 | 52.53 | 33.88 | 25.50 | 45.82 | |||||||||||
1965 | ----- | z | 27.24 | a | 32.50 | 43.07 | 50.48 | 58.63 | 68.84 | 68.23 | 55.05 | 51.92 | 40.82 | 29.90 | a | 47.88 | a | |||||||||
1966 | 23.87 | 22.70 | 37.73 | 45.47 | 56.56 | 63.68 | 71.47 | 68.31 | 61.17 | 48.11 | 39.55 | 27.67 | a | 47.19 | ||||||||||||
1967 | 25.75 | a | 32.27 | 41.11 | 42.73 | 53.32 | 61.55 | a | 71.98 | 68.50 | 62.18 | 51.42 | 39.75 | 20.91 | c | 47.62 | ||||||||||
1968 | 21.95 | b | 33.36 | a | 37.08 | 40.80 | 53.18 | 65.52 | 69.87 | 63.90 | 59.77 | 51.08 | 35.43 | 24.18 | 46.34 | |||||||||||
1969 | 29.69 | 28.09 | 31.23 | 47.70 | 59.19 | 62.59 | c | 71.95 | 71.62 | a | 62.80 | 43.71 | 36.42 | 31.03 | a | 48.00 | ||||||||||
1970 | 28.52 | a | 36.21 | b | 33.50 | 39.45 | 56.60 | 64.42 | 71.24 | 71.66 | b | 57.63 | 45.11 | 37.67 | 28.93 | b | 47.58 | |||||||||
1971 | 26.58 | a | 30.25 | 36.52 | a | 44.50 | 51.53 | 64.63 | d | 71.28 | a | 68.29 | b | 57.04 | b | 45.32 | 33.32 | 22.89 | 46.01 | |||||||
1972 | 27.11 | 34.33 | b | 43.05 | 45.92 | 54.69 | 64.17 | 70.85 | a | 66.66 | 59.05 | 47.24 | b | 31.00 | 21.39 | 47.12 | ||||||||||
1973 | 19.42 | 27.64 | 32.00 | 39.22 | 53.84 | 62.23 | b | 69.53 | a | 68.23 | 58.83 | c | 49.93 | a | 36.83 | 26.95 | a | 45.39 | ||||||||
1974 | 19.63 | 23.84 | 40.48 | 42.40 | a | 56.68 | 67.50 | b | 68.78 | a | 66.29 | b | 60.30 | b | 50.45 | a | 36.10 | 25.35 | 46.48 | |||||||
1975 | 23.75 | a | 27.42 | b | 34.08 | 40.00 | a | 49.72 | b | 59.28 | 67.76 | b | 65.32 | 59.38 | b | 49.23 | a | 32.81 | d | 28.24 | 44.75 | |||||
1976 | 25.18 | a | 35.29 | 34.74 | 44.55 | 53.66 | b | 61.95 | 69.90 | a | 65.40 | 58.60 | 46.02 | 37.87 | 29.11 | 46.86 | ||||||||||
1977 | 22.93 | a | 33.09 | 33.08 | 47.73 | d | 52.61 | 68.08 | 70.53 | a | 69.11 | 62.12 | 51.31 | 38.52 | a | 31.93 | c | 48.42 | ||||||||
1978 | 26.84 | 26.62 | 39.44 | 45.76 | a | 51.69 | b | 65.02 | 70.55 | 67.06 | 59.65 | 52.60 | 37.43 | 19.20 | i | 49.33 | a | |||||||||
1979 | 18.23 | 24.25 | 32.31 | 42.52 | 51.82 | 61.45 | 68.93 | a | 65.52 | a | 63.25 | 51.75 | a | 28.98 | c | 29.05 | a | 44.84 | ||||||||
1980 | 26.03 | a | 30.32 | a | 30.44 | 44.18 | e | 49.69 | 64.03 | 69.93 | a | 66.97 | b | 60.47 | 48.30 | c | 37.48 | 36.18 | a | 47.00 | ||||||
1981 | 33.40 | a | 32.23 | 35.39 | 48.50 | a | 52.72 | a | 67.24 | a | 69.74 | b | 66.53 | b | 61.12 | 45.98 | c | 39.18 | 29.61 | d | 48.47 | |||||
1982 | 23.22 | a | 27.52 | 36.44 | g | 43.30 | 53.18 | a | 62.61 | b | 68.15 | a | 67.34 | 59.85 | 44.47 | a | 34.79 | a | 25.15 | d | 46.32 | a | ||||
1983 | 27.45 | c | 29.33 | b | 33.56 | d | 38.89 | b | 50.45 | a | 61.60 | d | 69.27 | a | 68.23 | 62.03 | a | 49.66 | 34.37 | d | 26.11 | 45.91 | ||||
1984 | 22.84 | 27.36 | a | 34.63 | e | 39.19 | d | 57.62 | b | 59.93 | c | 70.39 | 68.23 | 60.69 | d | 42.20 | a | 35.63 | 28.68 | 45.62 | ||||||
1985 | 24.85 | a | 23.78 | a | 35.24 | 47.11 | b | 53.62 | c | 65.14 | a | 69.73 | a | 68.02 | c | 54.45 | 48.05 | a | 33.87 | 28.97 | a | 46.07 | ||||
1986 | 33.50 | b | 33.35 | a | 41.50 | b | 44.12 | b | 53.14 | b | 64.02 | 67.65 | a | 68.30 | d | 54.62 | 45.24 | b | 36.23 | 29.63 | a | 47.61 | ||||
1987 | 24.56 | 30.66 | 33.23 | a | 47.90 | a | 53.65 | a | 64.65 | 67.48 | 65.45 | 58.50 | a | 51.31 | 35.43 | a | 23.90 | e | 46.39 | |||||||
1988 | 20.85 | 27.83 | 34.60 | 45.02 | 53.05 | 64.04 | d | 70.47 | 67.31 | 56.46 | c | 53.82 | 35.28 | c | 26.44 | d | 46.26 | |||||||||
1989 | 20.67 | a | 27.89 | 41.32 | a | 49.82 | b | 56.20 | a | 62.60 | a | 71.40 | 65.52 | b | 61.05 | 47.88 | a | 38.03 | 29.73 | a | 47.68 | |||||
1990 | 24.27 | c | 28.02 | b | 39.10 | a | 47.57 | a | 52.00 | 68.40 | e | 69.55 | 66.92 | 62.60 | 47.95 | 36.72 | 19.02 | b | 46.84 | |||||||
1991 | 20.90 | a | 30.87 | a | 32.84 | b | 42.14 | b | 51.50 | 60.81 | d | 69.85 | a | 68.40 | 60.80 | 51.10 | 33.08 | 25.50 | 45.65 | |||||||
1992 | 23.12 | a | 31.11 | b | 39.10 | 49.64 | b | 54.53 | 61.60 | d | 65.44 | e | 67.66 | c | 59.82 | 52.80 | c | 31.35 | 23.52 | b | 46.64 | |||||
1993 | 27.53 | b | 29.72 | a | 37.57 | a | 44.76 | a | 54.02 | a | 62.45 | b | 68.44 | 66.02 | e | 57.41 | g | 46.53 | b | 32.38 | a | 27.23 | e | 45.15 | a | |
1994 | 29.83 | a | 27.16 | 41.40 | a | 45.23 | 54.30 | c | 68.77 | h | 71.87 | a | 71.25 | c | 61.87 | 46.69 | 31.14 | b | 30.20 | a | 46.45 | a | ||||
1995 | 28.22 | b | 38.23 | 39.89 | c | 42.91 | c | 49.47 | 59.47 | ----- | z | 70.38 | b | 62.09 | c | 48.45 | 40.50 | 31.96 | c | 46.51 | a | |||||
1996 | 28.27 | 36.03 | 38.12 | a | 46.68 | 59.70 | d | 67.26 | g | 73.40 | 71.68 | 57.52 | c | 48.30 | a | 36.25 | b | 27.52 | d | 47.59 | a | |||||
1997 | 26.50 | 28.77 | 37.84 | 41.90 | a | 55.72 | a | 62.81 | a | 68.65 | a | 66.77 | a | 61.83 | a | 46.26 | b | 37.14 | a | 25.90 | a | 46.67 | ||||
1998 | 28.81 | 28.88 | 35.11 | 41.48 | a | 53.16 | b | 59.90 | 72.53 | b | 70.10 | b | 63.03 | a | 47.93 | b | 36.76 | a | 29.26 | b | 47.25 | |||||
1999 | 32.08 | a | 33.62 | 42.05 | c | 40.15 | 51.45 | 61.95 | a | 69.88 | a | 66.48 | d | 58.32 | 51.48 | a | 42.45 | 29.46 | c | 48.28 | ||||||
2000 | 29.84 | 34.61 | a | 36.43 | b | 48.33 | a | 58.67 | a | 67.78 | 71.24 | d | 71.48 | 62.04 | b | 48.52 | 29.45 | 30.16 | c | 49.05 | ||||||
2001 | 27.10 | 30.84 | 39.66 | 45.43 | b | 57.77 | 65.21 | d | 70.85 | 68.29 | 63.16 | b | 50.93 | a | 39.12 | 24.20 | c | 48.55 | ||||||||
2002 | 23.23 | i | 27.13 | a | 34.02 | a | 50.33 | a | 55.05 | a | 68.79 | a | 73.82 | a | 69.12 | a | 60.52 | 46.97 | a | 36.38 | a | 29.46 | c | 50.14 | a | |
2003 | 34.94 | 30.44 | c | 36.13 | a | 44.81 | a | 56.17 | a | 66.07 | 74.52 | 70.93 | d | 60.12 | 53.48 | 35.33 | c | 29.93 | d | 49.40 | ||||||
2004 | 25.73 | a | 25.93 | 43.10 | b | 46.27 | 55.55 | 65.72 | c | 69.84 | b | 67.42 | 59.75 | d | 48.37 | h | 35.76 | e | 30.06 | 47.74 | a | |||||
2005 | 34.19 | 33.64 | 37.47 | 45.17 | 54.58 | a | 61.37 | 72.89 | 67.78 | a | 61.12 | 49.88 | b | 39.88 | 28.50 | 48.87 | ||||||||||
2006 | 30.92 | 32.86 | 35.45 | 47.30 | 58.08 | a | 68.20 | 72.38 | c | 68.18 | a | 57.20 | 47.65 | 42.73 | 32.95 | 49.49 | ||||||||||
2007 | 29.17 | d | 31.89 | 40.74 | 46.32 | 54.57 | b | 66.52 | a | 73.32 | c | 68.70 | c | 62.60 | e | 48.56 | 39.90 | 23.94 | 48.85 | |||||||
2008 | 18.00 | b | 26.18 | a | 34.25 | c | 41.92 | 49.79 | c | 63.86 | a | 71.97 | a | 71.08 | a | 61.37 | 49.74 | 40.83 | 27.91 | d | 46.41 | |||||
2009 | 27.53 | a | 31.39 | 38.90 | a | 42.65 | 57.43 | a | 62.06 | c | 71.77 | 68.87 | a | 61.95 | 45.11 | 39.57 | 21.64 | f | 49.75 | a | ||||||
2010 | 23.79 | 25.81 | a | 32.95 | 43.82 | 50.92 | a | 65.16 | a | 71.53 | 67.05 | 62.69 | c | 50.90 | 34.50 | 33.85 | d | 46.91 | ||||||||
2011 | 18.83 | m | 26.60 | b | 37.32 | q | 44.86 | a | 50.10 | 63.62 | 70.56 | 71.23 | 61.78 | 49.33 | a | 35.93 | b | 27.20 | c | 50.12 | b | |||||
2012 | 30.21 | 30.41 | 40.26 | 48.62 | 58.32 | 69.38 | 72.15 | 71.03 | 62.50 | 50.52 | a | 41.08 | 27.20 | d | 50.14 | |||||||||||
2013 | 20.81 | 26.59 | 39.92 | 45.03 | 54.52 | a | 68.86 | b | 72.94 | 68.65 | 60.89 | b | 46.03 | a | 37.07 | c | 23.19 | 47.04 | ||||||||
2014 | 30.58 | 35.02 | 39.29 | 44.87 | 53.69 | 65.58 | 72.89 | 66.71 | 63.63 | 52.15 | 36.67 | d | 31.10 | a | 49.35 | |||||||||||
2015 | 31.73 | 36.43 | 42.21 | 45.57 | 50.43 | a | 66.09 | b | 67.52 | 69.06 | 64.35 | 52.84 | 35.97 | 24.87 | 48.92 | |||||||||||
2016 | 22.65 | 31.79 | 40.75 | c | 45.38 | a | 52.31 | 69.15 | d | 70.78 | a | 66.52 | b | 60.45 | b | 52.45 | 41.48 | 28.05 | 48.48 | |||||||
2017 | 26.34 | b | 35.77 | 43.03 | 44.40 | 53.45 | 69.07 | a | 71.52 | a | 67.76 | 62.07 | 49.46 | c | 42.65 | d | 33.85 | 49.95 | ||||||||
2018 | 31.61 | 33.09 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.35 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 26.28 | 29.81 | 36.61 | 44.57 | 53.89 | 64.29 | 70.54 | 68.01 | 60.47 | 49.06 | 36.42 | 27.67 | 47.29 | |||||||||||||
S.D. | 4.13 | 4.08 | 3.66 | 2.91 | 2.72 | 2.77 | 1.81 | 1.88 | 2.35 | 2.71 | 3.35 | 3.39 | 1.39 | |||||||||||||
SKEW | 0.06 | -0.00 | -0.02 | 0.08 | 0.11 | 0.11 | -0.22 | 0.25 | -0.88 | -0.24 | -0.16 | -0.11 | 0.31 | |||||||||||||
MAX | 34.94 | 38.23 | 43.10 | 51.13 | 59.70 | 69.38 | 74.52 | 71.68 | 64.35 | 54.08 | 42.73 | 36.18 | 50.14 | |||||||||||||
MIN | 18.00 | 20.10 | 28.53 | 38.89 | 48.26 | 58.63 | 65.44 | 63.90 | 54.42 | 42.20 | 28.98 | 19.02 | 44.75 | |||||||||||||
YRS | 61 | 64 | 61 | 65 | 66 | 63 | 65 | 67 | 66 | 65 | 67 | 63 | 50 |