YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | 30.80 | 35.42 | 39.80 | 46.42 | 45.77 | 43.27 | 33.13 | 37.17 | 26.03 | 37.53 | c | |||||||||
1954 | 28.81 | 27.36 | 27.68 | 33.67 | 37.68 | 42.17 | 47.23 | 44.10 | 36.50 | 30.06 | 28.77 | 24.48 | 34.04 | |||||||||||||
1955 | 19.74 | 23.57 | 25.68 | 28.83 | 35.00 | 45.07 | 44.68 | 46.39 | 38.87 | 34.23 | 28.27 | 27.87 | 33.18 | |||||||||||||
1956 | 27.87 | 22.66 | 26.55 | 32.87 | 37.71 | 41.20 | 49.29 | 44.94 | 40.63 | 34.61 | 25.03 | 20.45 | 33.65 | |||||||||||||
1957 | 16.58 | 27.75 | 32.35 | 32.40 | 39.43 | c | 44.07 | b | 45.00 | 41.52 | 41.10 | 32.81 | 23.37 | 22.97 | 33.28 | |||||||||||
1958 | 24.45 | 31.18 | 25.29 | 29.37 | 37.84 | 45.73 | 52.19 | 50.58 | 40.53 | 34.52 | 28.33 | 27.52 | 35.63 | |||||||||||||
1959 | 27.23 | 25.57 | 26.58 | 30.33 | 33.94 | 44.27 | 49.45 | 45.61 | 41.87 | 35.29 | 23.57 | 21.29 | 33.75 | |||||||||||||
1960 | 25.32 | 26.31 | 32.00 | 31.13 | 35.52 | 39.57 | 48.77 | 44.87 | 39.50 | 33.20 | a | 27.33 | 21.58 | 33.76 | ||||||||||||
1961 | 24.52 | 31.75 | 30.68 | 32.23 | 37.03 | 47.13 | 47.10 | 49.23 | 37.63 | 31.94 | 25.73 | 25.97 | 35.08 | |||||||||||||
1962 | 19.55 | b | 26.67 | a | 28.61 | c | 32.87 | 37.29 | 40.87 | 45.84 | 46.74 | 41.97 | 35.84 | 32.23 | 27.52 | 34.67 | ||||||||||
1963 | 18.90 | 34.04 | 28.87 | 32.30 | 40.94 | 43.60 | 45.65 | 46.68 | 45.20 | 39.39 | 32.33 | 26.80 | a | 36.22 | ||||||||||||
1964 | 24.32 | 21.93 | 26.10 | 27.27 | 35.35 | 43.47 | 48.06 | 44.81 | 35.73 | 35.32 | 29.27 | 30.81 | 33.54 | |||||||||||||
1965 | 27.26 | 25.07 | 27.77 | 35.70 | 35.00 | 42.93 | 46.74 | 48.68 | 37.47 | 33.94 | 31.60 | 23.87 | 34.67 | |||||||||||||
1966 | 23.75 | c | 24.64 | 28.97 | a | 30.25 | b | ----- | z | 42.20 | 43.71 | 46.45 | 41.10 | 31.97 | 32.83 | 27.35 | 33.93 | a | ||||||||
1967 | 25.52 | 25.43 | 26.23 | a | 27.39 | b | 36.48 | 45.13 | 51.35 | 50.90 | 44.38 | a | 35.53 | a | 31.07 | b | 16.07 | a | 34.62 | |||||||
1968 | 21.74 | 31.48 | 30.16 | 31.72 | a | 37.10 | a | 44.23 | 49.37 | a | 46.97 | a | 41.00 | 34.54 | c | 30.57 | b | 23.06 | 35.16 | |||||||
1969 | 23.06 | 25.68 | 26.32 | 31.36 | b | 38.68 | 46.64 | b | 48.10 | 43.63 | a | 42.43 | 31.45 | 26.70 | 28.74 | 34.40 | ||||||||||
1970 | 30.71 | 28.89 | 28.74 | 28.67 | 38.06 | 46.93 | 49.26 | 45.50 | a | 36.50 | b | 32.26 | 31.32 | b | ----- | z | 36.08 | a | ||||||||
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.96 | c | 50.26 | 40.50 | 34.26 | 30.60 | 23.26 | 38.31 | f | |||||
1972 | 22.55 | 29.59 | 34.90 | 32.20 | 38.90 | 44.77 | 48.48 | 48.00 | 40.27 | 35.10 | 30.20 | 20.90 | 35.49 | |||||||||||||
1973 | 25.74 | 31.04 | 29.20 | a | 31.27 | 41.13 | 45.23 | 49.52 | 46.03 | 42.03 | 36.10 | 34.73 | 32.29 | 37.03 | ||||||||||||
1974 | 22.40 | a | 26.57 | 31.52 | 31.90 | 36.68 | 46.93 | a | 49.03 | 48.81 | 44.23 | 34.77 | 30.27 | 25.52 | 35.72 | |||||||||||
1975 | 24.03 | 27.79 | 30.81 | 28.04 | d | 37.00 | 40.80 | 51.84 | 47.35 | 45.17 | 37.35 | 29.07 | 29.16 | 35.70 | ||||||||||||
1976 | 26.90 | 27.52 | 27.03 | 30.93 | 36.58 | 40.77 | 51.29 | 49.37 | a | 46.97 | 36.29 | 31.24 | a | 21.90 | 35.57 | |||||||||||
1977 | 17.52 | 27.96 | 27.52 | 32.90 | 35.32 | 49.80 | 49.10 | 52.69 | b | 44.53 | 36.29 | 30.20 | 30.58 | 36.20 | ||||||||||||
1978 | 31.35 | 29.54 | 34.87 | 34.10 | 36.10 | 44.00 | 49.94 | 49.42 | 42.67 | 35.97 | 26.80 | 20.81 | 36.30 | |||||||||||||
1979 | 23.61 | 29.00 | 31.74 | 35.24 | a | 39.74 | 43.30 | 49.48 | 48.52 | 45.17 | 41.68 | 29.17 | 28.52 | 37.10 | ||||||||||||
1980 | 26.20 | a | 33.21 | 28.65 | 34.30 | 38.32 | 42.90 | a | 51.06 | 46.58 | 43.33 | c | 37.39 | 30.40 | 28.68 | 36.75 | ||||||||||
1981 | 30.58 | 29.54 | 30.23 | 34.97 | 39.97 | 44.73 | 48.03 | 49.32 | 45.03 | 35.45 | 34.52 | a | 33.13 | 37.96 | ||||||||||||
1982 | 22.84 | 27.96 | a | 29.58 | 29.57 | 37.42 | 46.34 | a | 48.68 | 48.19 | 40.97 | 36.52 | 28.97 | 25.80 | a | 35.24 | ||||||||||
1983 | 28.23 | 32.68 | 34.23 | 31.97 | 38.52 | 42.07 | 45.45 | 50.03 | 42.90 | 37.77 | 33.57 | b | 30.17 | a | 37.30 | |||||||||||
1984 | 24.58 | 28.41 | 31.77 | a | 34.67 | 39.10 | 42.40 | 50.26 | 48.32 | 40.93 | 34.71 | 30.90 | 24.52 | 35.88 | ||||||||||||
1985 | 23.58 | 25.50 | 27.06 | 36.50 | 38.55 | 47.37 | 53.23 | 47.84 | 41.80 | 35.29 | 24.69 | a | 24.27 | a | 35.47 | |||||||||||
1986 | 32.18 | c | 33.43 | 34.35 | 34.47 | 42.03 | 49.63 | 51.19 | 52.39 | 40.43 | 36.13 | 30.07 | 26.35 | 38.55 | ||||||||||||
1987 | 23.60 | a | 26.93 | 29.77 | a | 36.03 | 41.17 | a | 47.20 | 45.45 | 48.16 | 41.70 | 39.03 | 31.67 | 27.45 | 36.51 | ||||||||||
1988 | 25.84 | 26.34 | 27.23 | 36.67 | 37.19 | 45.07 | 50.71 | 48.57 | a | 41.53 | 38.74 | 32.10 | 23.42 | 36.12 | ||||||||||||
1989 | 21.74 | 21.89 | 32.52 | 36.27 | 38.48 | 45.53 | 45.71 | 46.35 | 42.00 | 35.39 | 27.53 | 22.10 | 34.63 | |||||||||||||
1990 | 26.06 | 22.14 | 30.45 | 37.97 | a | 35.90 | 42.43 | 51.77 | 47.88 | g | 43.37 | 35.71 | 26.80 | 18.16 | 33.71 | a | ||||||||||
1991 | 22.77 | 29.75 | 29.23 | 32.27 | 35.81 | 39.87 | 51.94 | 48.35 | 43.87 | 37.32 | 30.73 | 25.68 | 35.63 | |||||||||||||
1992 | 26.97 | 31.03 | 33.52 | 37.60 | 42.06 | 46.53 | 50.13 | 48.29 | 43.07 | 37.90 | 29.31 | a | 25.68 | 37.67 | ||||||||||||
1993 | 21.90 | 27.00 | 35.13 | 33.90 | 41.45 | 41.47 | 42.35 | 46.35 | 40.73 | 37.35 | 24.27 | 26.16 | 34.84 | |||||||||||||
1994 | 25.71 | 26.75 | 29.55 | 34.63 | 41.87 | 42.13 | 50.55 | 45.03 | 43.53 | 33.26 | 26.20 | 26.06 | 35.44 | |||||||||||||
1995 | 33.61 | 30.71 | 31.29 | 32.87 | 40.06 | 43.33 | 48.77 | 44.20 | a | 42.90 | 33.03 | 33.38 | a | 32.84 | 37.25 | |||||||||||
1996 | 29.55 | 32.62 | 31.03 | 33.03 | 37.61 | 42.30 | 52.23 | 47.77 | 41.37 | 36.13 | 31.86 | a | 30.87 | a | 37.20 | |||||||||||
1997 | 26.42 | 28.32 | 31.71 | 33.87 | 42.68 | 43.20 | 49.26 | 49.29 | 44.13 | 36.48 | 33.93 | 25.53 | a | 37.07 | ||||||||||||
1998 | 33.00 | a | 32.04 | 32.81 | 33.47 | 38.39 | 43.80 | 51.29 | 49.58 | 46.63 | 34.16 | 33.00 | 23.65 | 37.65 | ||||||||||||
1999 | 26.35 | 28.22 | a | 30.16 | 31.87 | 36.29 | 38.67 | 44.58 | 47.48 | 40.40 | 33.23 | a | 35.27 | 24.81 | 34.78 | |||||||||||
2000 | 28.32 | 32.69 | 30.23 | 35.30 | 38.10 | a | 44.83 | 47.77 | 46.77 | 41.50 | 33.77 | 25.67 | 25.39 | 35.86 | ||||||||||||
2001 | 24.03 | 25.29 | 30.37 | a | 34.50 | 40.35 | 41.40 | 48.32 | 49.10 | 42.67 | 36.55 | 30.17 | a | 28.55 | 35.94 | |||||||||||
2002 | 24.55 | 27.46 | 26.35 | 33.70 | 36.71 | 43.90 | 50.39 | 45.58 | 40.83 | 30.45 | 29.43 | 28.10 | 34.79 | |||||||||||||
2003 | 32.00 | 26.82 | 32.06 | 31.50 | 37.84 | 44.47 | 51.06 | 49.32 | 42.24 | a | 36.48 | 28.33 | 29.45 | 36.80 | ||||||||||||
2004 | 27.29 | 29.10 | 31.65 | 33.77 | 37.29 | 43.75 | b | 50.23 | 48.00 | 39.13 | 35.26 | 27.77 | 26.71 | 35.83 | ||||||||||||
2005 | 25.26 | 28.29 | 30.74 | 32.37 | 40.60 | a | 41.27 | 49.67 | a | 48.00 | 38.27 | 34.74 | 29.30 | 27.53 | a | 35.50 | ||||||||||
2006 | 28.68 | 25.93 | 28.19 | 33.63 | 38.57 | a | 46.70 | 51.65 | 46.19 | 39.90 | 31.84 | 31.83 | a | 25.71 | c | 35.73 | ||||||||||
2007 | 20.19 | 27.61 | 30.42 | 33.23 | 38.45 | 44.20 | 52.03 | 47.16 | 40.90 | 36.41 | b | 30.30 | 25.43 | a | 35.53 | |||||||||||
2008 | 24.42 | 25.86 | a | 27.87 | 28.90 | 39.23 | 42.20 | 48.48 | 48.42 | 40.57 | 34.65 | 31.07 | 22.40 | a | 34.50 | |||||||||||
2009 | 23.74 | 27.41 | a | 28.29 | 31.43 | 39.58 | 44.33 | 48.26 | 45.68 | 42.50 | 34.19 | 28.07 | 21.00 | 34.54 | ||||||||||||
2010 | 30.97 | a | 30.71 | 29.65 | 30.77 | 33.87 | 43.00 | a | 48.35 | 46.29 | 40.07 | 38.52 | 28.53 | 31.17 | b | 35.99 | ||||||||||
2011 | 23.81 | 24.07 | a | 32.35 | 32.80 | 35.00 | 40.97 | 48.00 | 47.03 | 41.90 | 34.23 | 26.73 | 16.73 | a | 33.64 | |||||||||||
2012 | 23.63 | a | 25.55 | 29.77 | a | 36.97 | 36.00 | a | 41.70 | 47.52 | 46.68 | 40.30 | 33.80 | a | 29.90 | ----- | z | 35.62 | a | |||||||
2013 | 18.45 | 22.37 | a | 28.16 | 33.00 | 38.68 | 43.40 | 49.35 | 44.65 | 41.97 | 27.10 | 25.17 | 14.45 | 32.23 | ||||||||||||
2014 | 20.55 | 27.93 | 29.90 | 32.47 | 37.58 | 40.93 | 50.16 | 45.19 | 40.60 | 34.94 | 27.86 | a | 27.90 | 34.67 | ||||||||||||
2015 | 24.42 | 27.75 | 29.84 | 29.69 | a | 37.43 | a | 45.30 | 49.10 | 45.77 | a | 41.43 | 39.71 | 27.20 | 29.58 | 35.60 | ||||||||||
2016 | 30.63 | a | 30.38 | 35.40 | a | 39.37 | 42.71 | 47.40 | 49.00 | 48.48 | 39.80 | 37.57 | a | 34.47 | 23.84 | 38.25 | ||||||||||
2017 | 23.84 | 32.37 | a | 35.35 | 36.13 | 41.45 | 48.27 | 50.29 | 51.10 | 45.70 | 32.77 | 34.59 | a | 22.17 | b | 37.84 | ||||||||||
2018 | 30.71 | 25.93 | 29.80 | f | 37.14 | a | 44.13 | a | 43.53 | 50.87 | 47.97 | 39.40 | 36.10 | b | 27.21 | b | ----- | z | 38.30 | b | ||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 25.32 | 27.92 | 30.05 | 32.91 | 38.22 | 43.83 | 48.95 | 47.44 | 41.63 | 35.12 | 29.71 | 25.50 | 35.59 | |||||||||||||
S.D. | 3.84 | 3.01 | 2.60 | 2.63 | 2.30 | 2.43 | 2.30 | 2.11 | 2.34 | 2.44 | 3.03 | 3.95 | 1.38 | |||||||||||||
SKEW | 0.08 | 0.02 | 0.28 | 0.04 | 0.39 | 0.27 | -0.65 | 0.03 | -0.12 | -0.29 | 0.04 | -0.47 | 0.01 | |||||||||||||
MAX | 33.61 | 34.04 | 35.40 | 39.37 | 44.13 | 49.80 | 53.23 | 52.69 | 46.97 | 41.68 | 37.17 | 33.13 | 38.55 | |||||||||||||
MIN | 16.58 | 21.89 | 25.29 | 27.27 | 33.87 | 38.67 | 42.35 | 41.52 | 35.73 | 27.10 | 23.37 | 14.45 | 32.23 | |||||||||||||
YRS | 64 | 64 | 63 | 65 | 64 | 65 | 66 | 65 | 66 | 66 | 66 | 63 | 59 |