YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | 25.71 | 32.38 | 36.52 | d | 55.57 | 61.48 | 69.47 | 71.10 | 70.35 | 61.87 | 52.10 | 36.10 | 36.03 | 50.72 | ||||||||||||
1949 | 24.87 | 35.86 | 42.35 | 48.07 | 61.42 | 66.47 | 71.26 | 67.52 | 63.17 | 50.94 | 40.30 | 34.90 | 50.59 | |||||||||||||
1950 | 35.71 | 40.32 | 40.77 | 51.07 | 59.74 | 67.47 | 69.71 | 67.48 | 63.07 | 57.03 | 38.03 | 29.23 | 51.64 | |||||||||||||
1951 | 28.00 | 34.93 | 40.58 | 48.10 | 60.81 | 68.40 | 72.84 | 71.90 | 63.77 | 55.26 | 38.07 | 34.52 | 51.43 | |||||||||||||
1952 | 38.06 | 37.38 | 41.16 | 50.90 | 59.29 | 71.50 | 71.00 | 75.61 | 63.70 | 50.39 | 40.43 | 33.55 | 52.75 | |||||||||||||
1953 | 37.42 | 34.50 | 48.03 | 49.23 | 59.81 | 74.50 | 73.42 | 71.61 | 64.40 | 55.39 | 40.83 | f | 30.74 | 54.46 | a | |||||||||||
1954 | 33.00 | 39.68 | 40.45 | 56.23 | 56.07 | a | 67.36 | b | 71.81 | 71.26 | 65.73 | 53.63 | a | 41.17 | 33.50 | a | 52.49 | |||||||||
1955 | 32.87 | a | 33.18 | 43.00 | 52.73 | 60.35 | 66.00 | 70.58 | 68.90 | 64.10 | 52.77 | 39.03 | 33.26 | 51.40 | ||||||||||||
1956 | 30.77 | 32.29 | a | 40.80 | a | 48.52 | c | 64.42 | 71.21 | a | 71.48 | 70.65 | 63.93 | 55.68 | 38.20 | 36.74 | 52.06 | |||||||||
1957 | 32.40 | a | 43.85 | a | 42.70 | a | 48.10 | 58.87 | 65.10 | 73.48 | 71.55 | b | 61.50 | b | 50.71 | 36.90 | a | 36.03 | 51.77 | |||||||
1958 | 30.74 | 33.30 | a | 35.27 | a | 47.68 | b | 59.68 | ----- | z | 71.97 | 71.07 | b | 65.13 | 53.06 | 40.83 | 29.32 | 48.91 | a | |||||||
1959 | 25.32 | f | 33.43 | 38.79 | c | 48.43 | b | 60.97 | a | 66.17 | 67.16 | 70.73 | i | 63.37 | 49.16 | 33.43 | 35.71 | 49.66 | b | |||||||
1960 | 31.56 | d | 31.28 | d | 34.84 | 50.74 | c | 56.45 | 68.76 | i | 69.96 | d | 71.13 | 63.93 | 55.23 | 41.17 | 30.35 | 48.79 | a | |||||||
1961 | 28.94 | 33.79 | 40.16 | l | 48.47 | 58.73 | a | 65.93 | 67.30 | a | 66.23 | 61.53 | 51.32 | 38.30 | 32.48 | 50.27 | a | |||||||||
1962 | 23.35 | 37.46 | b | 36.39 | c | 49.67 | 64.07 | b | 66.09 | g | 70.26 | 70.87 | 62.34 | a | 55.23 | 41.53 | 33.35 | 49.50 | a | |||||||
1963 | 20.97 | 30.12 | b | 41.34 | b | 56.17 | a | 62.86 | b | 68.41 | h | 72.90 | a | 71.13 | 71.80 | y | ----- | z | ----- | z | ----- | z | 50.78 | e | ||
1964 | ----- | z | ----- | z | ----- | z | ----- | z | 61.62 | g | 68.07 | 72.84 | 71.71 | 65.23 | 52.13 | 43.53 | 34.00 | 58.22 | e | |||||||
1965 | 35.87 | 32.32 | 34.48 | 55.00 | 60.45 | 68.23 | 71.81 | 69.13 | 64.47 | 51.87 | 47.40 | 40.94 | 52.66 | |||||||||||||
1966 | 28.16 | 30.79 | 44.39 | 49.83 | 58.97 | 66.93 | 74.00 | 67.13 | 63.57 | 49.58 | 47.03 | 29.97 | 50.86 | |||||||||||||
1967 | 30.97 | 33.64 | 48.87 | 58.23 | 59.00 | 69.07 | 70.39 | 67.84 | 61.67 | 52.32 | 44.37 | 32.03 | 52.37 | |||||||||||||
1968 | 34.65 | 33.21 | 43.03 | 50.40 | 60.35 | 66.23 | 69.48 | 69.58 | 61.07 | 55.06 | 41.50 | 32.48 | 51.42 | |||||||||||||
1969 | 36.23 | 37.82 | 35.45 | 53.13 | 58.87 | 67.30 | 74.71 | 71.42 | 64.43 | 51.77 | 40.27 | 36.65 | 52.34 | |||||||||||||
1970 | 30.10 | 36.96 | 38.45 | 51.80 | 57.45 | 66.27 | 71.13 | 70.39 | 63.90 | a | 50.32 | c | 39.17 | 38.65 | 51.21 | |||||||||||
1971 | 29.06 | 30.93 | 37.84 | 49.73 | 55.77 | 68.17 | 69.94 | 65.32 | 61.37 | 52.71 | 41.23 | 34.87 | 49.75 | |||||||||||||
1972 | 28.35 | 32.10 | 45.84 | 50.97 | 58.23 | 66.27 | 68.55 | 67.39 | 64.03 | 51.26 | 34.90 | 27.52 | 49.62 | |||||||||||||
1973 | 27.26 | 30.36 | 40.68 | 42.77 | 54.94 | 62.30 | 68.48 | 68.58 | 61.00 | 53.45 | 41.83 | 30.10 | 48.48 | |||||||||||||
1974 | 26.94 | 30.18 | 44.94 | 47.87 | 61.68 | 64.40 | 69.33 | a | 66.03 | 55.57 | ----- | z | 40.27 | 32.03 | 49.02 | a | ||||||||||
1975 | 30.74 | 30.54 | 37.77 | 45.47 | 56.42 | 65.30 | 67.58 | 67.74 | 56.28 | a | 51.58 | 39.27 | 29.77 | 48.20 | ||||||||||||
1976 | 27.94 | 39.48 | 40.32 | 50.33 | 53.45 | 65.43 | 66.63 | a | 67.74 | 61.07 | 42.03 | 33.21 | a | 28.71 | 48.03 | |||||||||||
1977 | 21.43 | c | 34.93 | ----- | z | 50.00 | 62.26 | 67.50 | 69.87 | 70.72 | b | 66.33 | 52.37 | a | 37.72 | a | 31.65 | 51.34 | a | |||||||
1978 | 23.87 | a | 26.11 | a | 33.33 | s | 54.77 | 60.39 | 67.07 | a | 73.00 | 68.97 | a | 64.69 | a | 53.40 | k | 42.41 | c | 29.28 | b | 51.05 | b | |||
1979 | 23.68 | 29.56 | a | 41.81 | 51.50 | 58.52 | d | 66.14 | a | 71.26 | 67.94 | 61.33 | 54.00 | 34.85 | d | 32.87 | 49.45 | |||||||||
1980 | 30.69 | e | 33.52 | 39.45 | 46.83 | 60.13 | 70.56 | c | 75.37 | a | 70.79 | c | 64.93 | 49.93 | a | 38.59 | a | 34.58 | 51.28 | |||||||
1981 | 32.00 | a | 36.39 | 41.23 | a | 54.73 | 58.07 | d | 66.28 | a | 72.16 | 68.87 | 63.37 | 50.97 | 40.90 | a | 35.21 | b | 51.68 | |||||||
1982 | 24.83 | g | 30.04 | e | 42.25 | c | 48.26 | g | 58.96 | h | 62.95 | h | ----- | z | 71.43 | a | 65.14 | a | 51.52 | d | 42.19 | d | 33.17 | a | 47.96 | e |
1983 | 28.38 | b | 34.08 | d | 41.00 | c | 44.59 | c | 57.07 | b | 64.22 | c | 71.29 | c | ----- | z | 66.07 | c | 56.50 | c | 43.67 | c | 24.68 | c | 48.32 | a |
1984 | ----- | z | ----- | z | 39.40 | f | 48.37 | c | 60.85 | d | 70.36 | b | 70.90 | 70.34 | b | 62.22 | c | 51.62 | g | 41.08 | e | 36.20 | f | 60.59 | e | |
1985 | 24.72 | f | 30.29 | g | 44.67 | d | 53.79 | f | 60.65 | e | 64.92 | d | 68.90 | a | 72.42 | 63.68 | b | 54.84 | 42.70 | 27.26 | 55.56 | c | ||||
1986 | ----- | z | 39.68 | 44.65 | 55.90 | a | 59.44 | d | 66.93 | b | 71.93 | b | 69.07 | a | 66.14 | a | 54.14 | c | 39.17 | 33.81 | 54.62 | a | ||||
1987 | 30.97 | a | 37.89 | 37.93 | b | 45.76 | a | 59.06 | 65.40 | 69.19 | 71.07 | a | 60.79 | a | 52.70 | a | 39.03 | 31.45 | 50.10 | |||||||
1988 | 28.45 | 31.07 | 37.97 | a | 47.77 | 58.10 | 67.43 | 70.39 | 69.61 | 63.37 | 51.68 | 40.77 | 31.23 | 49.82 | ||||||||||||
1989 | 32.61 | 29.96 | 38.90 | 53.14 | b | 61.74 | 64.17 | a | 70.23 | 70.91 | i | 60.34 | a | 51.87 | 39.37 | 24.16 | 47.86 | a | ||||||||
1990 | 33.13 | 37.61 | 42.77 | a | 49.97 | 59.52 | 73.31 | a | 69.39 | 68.42 | 65.03 | a | 50.20 | a | 43.63 | 29.61 | 51.88 | |||||||||
1991 | 28.81 | 37.71 | 43.58 | 52.59 | a | 61.68 | 67.23 | 69.90 | 68.03 | 61.07 | b | 51.70 | a | 36.33 | 35.50 | a | 51.18 | |||||||||
1992 | 31.97 | 39.03 | 43.50 | a | 52.69 | a | 56.74 | 65.00 | 70.58 | 66.67 | a | 63.00 | 53.19 | ----- | z | 34.35 | 52.43 | a | ||||||||
1993 | 30.06 | 33.32 | 39.30 | a | 48.17 | a | 57.65 | 67.27 | 73.45 | 72.42 | 60.97 | 50.03 | 35.83 | 33.77 | 50.19 | |||||||||||
1994 | 32.26 | 32.25 | 42.94 | 48.89 | b | 59.39 | 70.57 | 71.87 | 70.90 | 61.93 | 55.09 | h | 41.57 | 36.29 | 51.71 | a | ||||||||||
1995 | 33.11 | c | 36.93 | 40.03 | 48.77 | 54.67 | a | 60.67 | c | 64.03 | a | 70.07 | b | 62.76 | a | 52.42 | 40.45 | a | 31.50 | a | 49.62 | |||||
1996 | 29.23 | a | 34.55 | 34.90 | ----- | z | 66.84 | 69.25 | b | 73.29 | c | 70.94 | ----- | z | 52.10 | 39.62 | a | 33.17 | a | 50.39 | b | |||||
1997 | 30.61 | 35.36 | 43.07 | a | 45.33 | 57.61 | 64.62 | a | 72.45 | 70.90 | 66.33 | 54.10 | 37.77 | 30.70 | a | 50.74 | ||||||||||
1998 | 35.03 | 37.75 | 38.81 | 47.07 | 65.03 | 71.93 | 76.55 | 71.52 | 67.30 | 57.53 | a | 44.55 | a | 31.70 | a | 53.73 | ||||||||||
1999 | 33.97 | a | 38.79 | 42.90 | 51.52 | a | 58.29 | 66.93 | 71.50 | a | 73.28 | b | 62.24 | a | 52.23 | 45.34 | a | 32.84 | 52.49 | |||||||
2000 | 34.32 | 40.86 | 44.52 | 51.71 | b | 64.61 | 68.13 | 74.30 | a | 73.89 | d | 65.31 | a | 56.10 | a | 37.24 | a | 29.45 | b | 53.37 | ||||||
2001 | 31.19 | 36.86 | 41.16 | 53.31 | a | 61.90 | 71.07 | 76.43 | a | 72.42 | 63.97 | 53.71 | 46.27 | 35.57 | a | 53.65 | ||||||||||
2002 | 34.48 | 32.48 | a | 37.48 | 54.41 | a | 60.63 | a | 69.03 | a | 71.16 | 72.97 | a | 64.63 | 52.65 | 40.00 | 33.84 | 51.98 | ||||||||
2003 | 31.13 | 34.04 | 42.45 | 51.03 | 61.29 | 66.00 | 72.53 | a | 71.87 | a | 63.43 | 55.32 | 44.23 | 33.58 | 52.24 | |||||||||||
2004 | 35.42 | 34.03 | 48.65 | 52.00 | 61.50 | a | 68.07 | a | 70.74 | 68.74 | 63.90 | 55.29 | 41.67 | 33.35 | 52.78 | |||||||||||
2005 | 36.10 | 38.19 | b | 41.37 | a | 48.07 | b | 59.81 | 69.60 | 70.13 | a | 69.10 | 67.68 | b | 53.74 | 41.53 | 31.32 | 52.22 | ||||||||
2006 | 36.06 | 33.96 | 44.77 | 54.80 | 61.94 | 68.43 | 73.03 | 71.94 | 60.13 | 53.34 | b | 42.70 | 33.48 | b | 52.88 | |||||||||||
2007 | 29.25 | c | 33.35 | b | 46.73 | a | 47.20 | 59.41 | d | 65.23 | 67.80 | a | 70.74 | 65.73 | 55.32 | 41.62 | a | 32.65 | 51.25 | |||||||
2008 | 31.35 | 34.41 | 41.65 | 49.27 | 59.90 | 70.60 | 70.67 | a | 69.10 | 61.00 | a | 52.23 | 40.07 | 32.32 | 51.05 | |||||||||||
2009 | 29.16 | 37.96 | b | 44.32 | 48.90 | a | 58.57 | a | 67.80 | 71.58 | 70.55 | 61.27 | 50.03 | 40.72 | a | 28.21 | b | 50.76 | ||||||||
2010 | 30.55 | b | 31.64 | 39.16 | 50.00 | 56.93 | a | 70.96 | b | 71.16 | 72.71 | 65.67 | 53.06 | 40.07 | 33.71 | 51.30 | ||||||||||
2011 | 28.81 | 29.32 | 45.45 | 53.80 | 60.58 | 74.20 | 77.68 | 78.52 | 63.30 | 54.32 | 41.13 | 33.13 | 53.35 | |||||||||||||
2012 | 33.55 | 36.21 | a | 46.48 | 57.07 | 64.93 | a | 71.14 | a | 72.84 | 73.19 | 64.83 | 52.68 | 44.50 | 34.94 | 54.36 | ||||||||||
2013 | 32.54 | c | 30.91 | f | 39.64 | f | 44.75 | n | 55.00 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.54 | k |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.12 | g | 68.47 | 56.06 | 41.97 | 33.08 | e | 49.89 | h | |||
2016 | 31.41 | b | 37.00 | 46.55 | 50.80 | 52.61 | 66.40 | 74.58 | 71.56 | f | 64.97 | 57.97 | 49.17 | 34.43 | a | 51.44 | a | |||||||||
2017 | 33.23 | e | 39.70 | a | 47.16 | f | 52.69 | a | 54.96 | e | 68.37 | 72.37 | a | 68.90 | 64.53 | 53.42 | e | 41.64 | b | 31.19 | 52.82 | a | ||||
2018 | 26.33 | a | 33.25 | 45.32 | 45.47 | 66.42 | 73.00 | 74.19 | 72.97 | 64.90 | 52.29 | 35.71 | b | 33.23 | a | 51.92 | ||||||||||
2019 | 32.48 | 35.00 | 39.67 | a | 51.50 | 58.32 | 66.17 | 71.94 | 75.13 | 70.90 | a | 48.00 | 37.17 | 35.13 | 51.78 | |||||||||||
2020 | 34.61 | 32.24 | 47.48 | ----- | z | ----- | z | ----- | z | 74.58 | 73.23 | 57.90 | 49.52 | 45.50 | 30.26 | 49.48 | c | |||||||||
2021 | 32.19 | 24.14 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.90 | 42.07 | ----- | z | 38.08 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.83 | 34.46 | 41.56 | 50.55 | 59.68 | 67.74 | 71.40 | 70.42 | 63.43 | 52.76 | 40.58 | 32.60 | 51.42 | |||||||||||||
S.D. | 3.72 | 3.62 | 3.54 | 3.28 | 2.86 | 2.74 | 2.41 | 2.40 | 2.52 | 2.52 | 3.22 | 2.93 | 1.42 | |||||||||||||
SKEW | -0.53 | -0.08 | -0.03 | 0.16 | 0.12 | 0.35 | -0.08 | 0.44 | -0.37 | -0.93 | 0.09 | -0.31 | -0.41 | |||||||||||||
MAX | 38.06 | 43.85 | 48.87 | 58.23 | 66.84 | 74.50 | 77.68 | 78.52 | 70.90 | 57.97 | 49.17 | 40.94 | 54.36 | |||||||||||||
MIN | 20.97 | 24.14 | 34.48 | 42.77 | 52.61 | 60.67 | 64.03 | 65.32 | 55.57 | 42.03 | 33.21 | 24.16 | 48.03 | |||||||||||||
YRS | 66 | 68 | 64 | 65 | 67 | 64 | 69 | 66 | 69 | 67 | 69 | 69 | 47 |