YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.46 | s | 37.28 | 29.31 | 33.29 | j | ||
1952 | 26.34 | b | 33.53 | 35.48 | 48.63 | 54.84 | 59.05 | 71.10 | 68.65 | 61.23 | 54.15 | 31.70 | b | 31.53 | 48.02 | |||||||||||
1953 | 40.94 | 35.96 | 39.85 | 45.45 | 49.00 | 56.15 | 71.45 | 67.24 | 64.50 | 49.78 | a | 43.92 | 33.03 | 49.77 | ||||||||||||
1954 | 33.68 | a | 39.27 | 36.90 | b | 47.98 | a | 58.47 | 59.03 | 72.56 | 63.68 | 57.48 | 47.87 | 42.98 | 27.83 | a | 48.98 | |||||||||
1955 | 25.90 | 29.41 | 37.56 | 42.15 | 52.42 | 62.48 | 68.37 | 72.23 | 59.93 | 48.58 | 37.15 | 34.83 | a | 47.59 | ||||||||||||
1956 | 34.31 | 29.72 | 41.55 | 46.77 | 55.60 | 61.48 | 70.69 | 65.89 | 60.90 | 47.50 | 36.23 | 31.21 | 48.49 | |||||||||||||
1957 | 22.11 | 36.82 | 40.82 | 45.15 | 52.80 | a | 64.32 | 69.18 | 64.83 | a | 61.35 | 46.31 | 34.88 | a | 35.97 | 47.88 | ||||||||||
1958 | 32.33 | a | 40.54 | a | 35.55 | a | 44.22 | 59.76 | 61.12 | 69.23 | 71.16 | 57.58 | 50.73 | 39.83 | a | 39.40 | 50.12 | |||||||||
1959 | 34.98 | a | 32.96 | 39.94 | 48.93 | 49.69 | 65.65 | 74.23 | 68.07 | a | 58.68 | 51.95 | 39.25 | 28.24 | 49.38 | |||||||||||
1960 | 26.40 | 31.38 | a | 42.78 | b | 47.67 | d | 53.19 | 65.62 | 75.66 | 67.90 | a | 62.58 | 49.74 | 38.00 | a | 32.11 | 49.42 | ||||||||
1961 | 33.35 | 39.96 | 40.44 | 46.36 | a | 53.34 | 68.65 | 73.34 | 72.95 | 55.52 | 48.23 | ----- | z | ----- | z | 53.21 | b | |||||||||
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.65 | 34.45 | 37.55 | j | ||
1963 | 27.95 | 43.25 | 38.73 | 41.85 | 57.27 | 58.57 | 68.39 | 68.47 | 63.80 | 55.08 | a | 38.19 | v | 31.58 | 50.45 | a | ||||||||||
1964 | 30.53 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.53 | k | |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | 47.00 | i | 60.29 | b | 62.66 | a | 70.40 | 71.79 | 65.25 | 51.26 | 41.33 | 32.44 | 56.93 | d | ||||||
1967 | 31.53 | 37.79 | 37.80 | a | 37.05 | 57.46 | f | 61.52 | 73.32 | 81.16 | c | 59.38 | a | 49.33 | b | 40.06 | e | 29.55 | 48.95 | a | ||||||
1968 | 33.24 | 38.71 | 44.26 | 44.73 | 54.63 | a | ----- | z | 76.45 | ----- | z | ----- | z | ----- | z | 44.25 | t | 31.42 | 46.21 | e | ||||||
1969 | ----- | z | ----- | z | ----- | z | 49.48 | 60.50 | 63.20 | 72.03 | 70.32 | 62.97 | 44.27 | 39.80 | 35.61 | 55.35 | c | |||||||||
1970 | 34.06 | 40.25 | 40.13 | 41.71 | a | 55.50 | 64.10 | 71.10 | 71.27 | 55.55 | 46.08 | 40.65 | 31.57 | a | 49.33 | |||||||||||
1971 | 36.13 | 36.87 | a | 38.17 | a | 45.45 | a | 53.27 | 59.73 | 70.44 | 72.79 | 55.85 | 45.16 | 38.72 | 27.87 | 48.37 | ||||||||||
1972 | 28.48 | 36.90 | 46.85 | 46.45 | a | 57.87 | 65.08 | 71.06 | 69.77 | 57.12 | 48.52 | 37.95 | 25.67 | a | 49.31 | |||||||||||
1973 | 28.87 | a | 38.82 | 40.63 | 46.27 | ----- | z | 66.48 | e | 72.81 | 70.23 | 59.66 | a | ----- | z | 44.22 | l | 35.80 | d | 51.06 | c | |||||
1974 | 28.81 | 35.25 | 38.83 | b | 44.70 | 54.06 | 68.60 | 74.02 | i | 68.75 | a | 62.23 | 48.65 | 38.82 | 30.42 | f | 48.87 | b | ||||||||
1975 | 32.10 | g | 32.54 | a | 36.90 | 39.00 | 52.32 | 61.17 | 72.26 | 66.44 | 61.97 | 46.56 | e | 36.12 | d | 35.12 | c | 49.13 | a | |||||||
1976 | 31.65 | a | 39.83 | i | 35.03 | a | 44.50 | e | 57.68 | 61.72 | a | 72.98 | 64.16 | 61.48 | 48.97 | 40.98 | a | 30.29 | g | 51.92 | b | |||||
1977 | 25.80 | k | 37.89 | 37.73 | 50.28 | 51.40 | 68.82 | ----- | z | 68.30 | p | 60.55 | 50.63 | 40.42 | 36.73 | 48.27 | c | |||||||||
1978 | 35.03 | 37.23 | 42.68 | l | 45.52 | 52.74 | 62.48 | a | 71.11 | c | 67.98 | 56.74 | a | 54.06 | 35.17 | a | 26.76 | h | 51.81 | b | ||||||
1979 | 21.71 | 34.43 | 40.11 | d | 45.79 | a | 56.00 | a | 62.69 | a | 72.52 | 69.60 | 66.17 | f | 50.50 | n | 34.27 | 34.76 | d | 47.19 | b | |||||
1980 | 32.07 | a | 40.04 | a | 37.77 | 49.27 | 54.97 | 59.63 | 71.27 | a | 67.24 | 62.12 | e | 51.27 | a | 40.93 | 34.74 | 50.11 | ||||||||
1981 | 31.60 | 36.54 | 40.61 | 49.60 | a | 53.97 | 65.18 | 71.29 | c | 72.77 | 62.72 | 47.10 | a | 41.93 | 37.03 | 50.86 | ||||||||||
1982 | 29.73 | c | 34.33 | b | 38.77 | a | 42.61 | b | 53.27 | c | 62.07 | 69.38 | a | 71.59 | b | 59.13 | d | 47.84 | b | 33.29 | b | 32.07 | d | 47.84 | ||
1983 | 33.60 | 38.86 | 40.93 | a | 42.03 | a | 53.55 | a | 60.02 | 67.65 | d | 71.02 | d | 60.72 | c | 52.32 | 40.07 | 32.58 | f | 50.98 | a | |||||
1984 | 23.19 | b | 33.38 | c | 41.94 | 43.15 | c | 56.46 | e | 59.23 | d | 72.95 | b | 72.35 | 59.39 | c | 45.60 | b | 38.56 | m | 26.70 | d | 48.58 | a | ||
1985 | 26.67 | a | 32.06 | a | 37.00 | b | 50.77 | 56.37 | a | 66.98 | 76.74 | d | 68.63 | 54.29 | a | 48.23 | a | 32.20 | b | 26.23 | a | 48.01 | ||||
1986 | 37.37 | 40.84 | 46.58 | 47.52 | 55.25 | a | 69.66 | a | 68.67 | b | 73.64 | b | 54.71 | b | 49.86 | b | 41.67 | c | 30.92 | 51.39 | ||||||
1987 | 28.82 | 35.89 | a | 40.95 | c | 53.50 | c | ----- | z | 66.37 | c | 68.28 | b | 68.32 | a | 60.50 | p | 53.10 | a | 36.02 | d | 30.19 | d | 48.14 | b | |
1988 | 29.13 | d | 36.86 | 40.80 | c | 48.58 | d | 55.11 | d | 67.40 | d | 74.94 | 69.80 | a | 60.32 | 56.83 | a | 38.85 | 27.09 | b | 50.48 | |||||
1989 | 25.66 | 25.83 | a | 43.95 | b | 50.78 | c | 53.75 | a | 64.22 | 74.02 | a | 67.00 | c | 59.27 | d | 48.19 | b | 39.50 | 32.16 | 48.69 | |||||
1990 | 33.63 | a | 31.48 | a | 42.72 | b | 54.36 | b | 52.38 | c | 64.32 | b | 72.91 | b | 71.05 | b | 65.14 | a | 50.85 | d | 37.66 | a | 21.93 | b | 49.87 | |
1991 | 30.19 | d | 41.91 | a | 39.03 | 46.36 | b | 49.75 | c | 58.93 | c | 72.78 | b | 72.00 | 63.61 | c | 54.62 | b | 40.57 | c | 31.10 | a | 50.07 | |||
1992 | 33.95 | 40.29 | 44.97 | b | 53.78 | c | 62.22 | b | 65.77 | b | 69.89 | 72.88 | b | 62.45 | b | 54.35 | e | 35.55 | a | 27.82 | a | 51.99 | ||||
1993 | 23.06 | d | 27.20 | c | 44.80 | c | 46.76 | c | 58.89 | d | 58.17 | c | 62.76 | d | 65.81 | e | 60.62 | f | 51.77 | e | 32.26 | a | 31.97 | b | 45.77 | a |
1994 | 36.05 | 33.68 | 44.79 | b | 48.72 | e | 57.02 | a | 67.22 | e | 74.26 | d | 72.62 | e | 63.27 | d | 49.16 | c | 32.07 | b | 27.77 | a | 50.55 | |||
1995 | 34.33 | b | 42.85 | a | 40.14 | b | 45.71 | f | 52.24 | b | 59.86 | b | 70.35 | d | 68.09 | d | 62.38 | f | 49.75 | e | 46.21 | b | 33.68 | f | 51.54 | c |
1996 | 35.04 | f | 35.61 | a | 43.33 | b | 47.48 | i | 53.48 | f | 65.64 | h | 73.88 | e | 70.71 | e | 59.77 | d | 49.88 | c | 41.21 | b | 36.08 | a | 51.31 | d |
1997 | 33.16 | b | 34.48 | d | 44.66 | b | 44.52 | e | 59.09 | d | 63.44 | d | 68.65 | g | ----- | z | ----- | z | 48.67 | h | 40.24 | c | 28.80 | a | 43.55 | d |
1998 | 37.48 | c | 35.35 | d | 40.46 | e | 44.46 | c | 50.85 | g | 59.34 | e | 73.59 | d | 72.70 | h | 64.15 | d | 44.64 | j | 39.02 | b | 29.00 | e | 46.99 | c |
1999 | 32.79 | b | 35.00 | b | 39.26 | d | 43.04 | g | 53.31 | d | 63.09 | g | 71.02 | c | 69.11 | h | 59.67 | a | 52.82 | c | 44.43 | a | 31.55 | 46.65 | c | |
2000 | 34.25 | g | 38.45 | a | 39.23 | g | 51.06 | c | 56.15 | g | 66.56 | d | 71.68 | c | 72.21 | c | 59.38 | d | 48.10 | a | 32.87 | c | 32.21 | b | 52.50 | c |
2001 | 27.25 | a | 30.66 | c | 44.71 | g | 43.54 | g | 65.12 | w | 64.20 | e | 69.76 | b | 72.93 | c | 63.06 | d | 52.91 | d | 38.29 | b | 31.77 | e | 50.09 | c |
2002 | 32.47 | 34.70 | c | 37.87 | d | 47.50 | c | 54.88 | c | 65.86 | a | 75.35 | 67.48 | h | 60.33 | c | 46.00 | c | 38.34 | b | 34.52 | c | 47.98 | a | ||
2003 | 39.95 | b | 32.02 | d | 44.62 | a | 43.32 | b | 53.93 | c | 65.54 | c | 76.73 | 71.20 | c | 62.87 | 54.57 | b | 34.71 | b | 34.83 | d | 51.19 | |||
2004 | 31.23 | a | 33.62 | a | 46.87 | 48.50 | b | 56.12 | b | 65.11 | b | 73.47 | a | 69.82 | a | 60.17 | c | 49.57 | b | 37.28 | c | 31.24 | l | 51.98 | a | |
2005 | 26.40 | 32.90 | b | 42.22 | b | 46.66 | b | 54.47 | 59.89 | b | 74.70 | a | 71.72 | d | 57.87 | d | 49.65 | a | 37.69 | a | 31.90 | 48.84 | ||||
2006 | 35.68 | c | 33.50 | b | 36.13 | d | 47.13 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.10 | i |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | 46.14 | w | 57.25 | s | 63.96 | d | 74.75 | e | 72.43 | h | 61.84 | b | 50.82 | a | 43.00 | a | 30.08 | 54.07 | f | |
2009 | 34.09 | b | 35.80 | 40.22 | d | 46.45 | 59.39 | 62.41 | b | 73.24 | 70.92 | a | 66.20 | 45.94 | 39.67 | 25.85 | 50.01 | |||||||||
2010 | 35.84 | 37.45 | 40.15 | a | 44.10 | a | 49.32 | 62.10 | 72.20 | a | 69.47 | a | 61.61 | h | 53.37 | a | 36.52 | b | 34.69 | 48.66 | a | |||||
2011 | 31.53 | 34.21 | 40.88 | b | 43.60 | 50.93 | b | 60.33 | 71.37 | 73.61 | 65.40 | a | 55.43 | p | 36.69 | c | 29.56 | 48.92 | a | |||||||
2012 | 33.44 | 33.84 | a | 44.13 | 49.93 | 56.06 | 63.22 | a | 75.61 | 73.56 | 64.88 | a | 50.94 | 41.96 | c | 32.77 | 51.70 | |||||||||
2013 | 21.00 | 35.27 | 44.24 | 47.55 | b | 57.08 | 66.05 | 77.77 | c | 73.05 | 63.77 | b | 45.98 | 40.20 | 26.36 | i | 52.00 | a | ||||||||
2014 | 35.31 | 39.93 | a | 43.36 | b | 48.87 | 57.11 | 64.94 | c | 76.63 | l | 71.16 | 65.15 | 55.79 | 41.00 | 37.53 | 50.92 | a | ||||||||
2015 | 35.90 | a | 41.63 | a | 48.29 | 45.95 | b | 54.37 | h | 72.42 | 72.90 | 73.89 | 64.90 | 57.70 | c | 35.71 | a | 32.37 | 52.88 | a | ||||||
2016 | 30.61 | 39.26 | 44.31 | 52.03 | 55.40 | 67.28 | a | 70.10 | f | 69.78 | k | 61.60 | 53.81 | 43.83 | 27.67 | a | 47.58 | b | ||||||||
2017 | 25.85 | 38.00 | 46.94 | 48.13 | 56.52 | e | 62.60 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.09 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.20 | 35.92 | 41.07 | 46.66 | 55.03 | 63.47 | 72.12 | 70.28 | 60.95 | 50.22 | 38.55 | 31.57 | 49.57 | |||||||||||||
S.D. | 4.54 | 3.77 | 3.27 | 3.47 | 2.98 | 3.37 | 2.70 | 3.03 | 3.00 | 3.19 | 3.34 | 3.54 | 1.24 | |||||||||||||
SKEW | -0.35 | -0.31 | 0.22 | -0.14 | 0.13 | 0.17 | -0.53 | 0.38 | -0.35 | 0.31 | -0.19 | -0.20 | 0.19 | |||||||||||||
MAX | 40.94 | 43.25 | 48.29 | 54.36 | 62.22 | 72.42 | 77.77 | 81.16 | 66.20 | 57.70 | 46.21 | 39.40 | 51.99 | |||||||||||||
MIN | 21.00 | 25.83 | 35.03 | 37.05 | 49.00 | 56.15 | 62.76 | 63.68 | 54.29 | 44.27 | 31.70 | 21.93 | 47.59 | |||||||||||||
YRS | 56 | 58 | 56 | 55 | 52 | 57 | 55 | 52 | 53 | 54 | 57 | 54 | 27 |