YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 101.04 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 46.30 | a | 56.52 | a | 63.57 | j | 76.25 | b | 79.48 | b | 95.87 | 97.89 | d | 95.32 | 89.48 | a | 68.92 | g | 54.52 | a | 51.50 | a | 74.31 | b | ||
1947 | 43.10 | b | 59.35 | b | 65.74 | 72.52 | a | 85.68 | f | 90.71 | b | 100.04 | c | 92.04 | e | 90.46 | d | 74.58 | g | 52.83 | a | 46.36 | c | 71.31 | b | |
1948 | 46.50 | e | 50.36 | d | 55.42 | e | 73.89 | c | 84.40 | f | 90.96 | f | 98.33 | g | 95.27 | a | 90.00 | c | 72.40 | a | 50.80 | e | 47.27 | e | 64.66 | c |
1949 | 39.04 | e | 43.52 | c | 61.92 | g | 74.88 | f | 80.19 | 89.60 | 96.81 | 96.90 | 90.12 | d | 70.58 | 63.50 | 46.58 | 71.68 | b | |||||||
1950 | 46.06 | 56.18 | 65.57 | c | 77.03 | 81.90 | 93.56 | c | ----- | z | 95.55 | b | 85.70 | 81.94 | 62.67 | c | 55.25 | c | 72.86 | a | ||||||
1951 | 45.74 | 55.57 | 61.74 | 71.23 | 81.71 | 90.37 | 101.13 | a | 94.52 | 92.40 | o | 71.00 | h | 56.15 | q | 40.19 | o | 75.25 | d | |||||||
1952 | 40.71 | 52.12 | d | 55.97 | 72.83 | a | 83.97 | 89.42 | k | 95.45 | 95.66 | b | 88.45 | a | 80.06 | 53.00 | 44.77 | a | 69.36 | a | ||||||
1953 | 49.26 | 53.46 | 64.13 | 70.10 | 79.29 | 96.21 | a | 99.32 | 95.65 | 93.00 | 75.30 | a | 60.00 | 46.43 | a | 73.51 | ||||||||||
1954 | 49.13 | 65.18 | 64.32 | 79.09 | g | 86.35 | 94.27 | 98.77 | 95.42 | 89.32 | b | 76.77 | 63.69 | a | 45.33 | a | 75.32 | a | ||||||||
1955 | 44.55 | 45.44 | a | 61.94 | 70.55 | a | 80.53 | a | 90.00 | a | 98.32 | 96.19 | 91.03 | 78.80 | a | 58.14 | a | 52.37 | a | 72.32 | ||||||
1956 | 52.06 | 51.62 | 65.16 | 73.38 | a | 84.74 | 97.17 | 97.59 | b | 93.81 | 93.53 | 77.03 | a | 53.19 | d | 48.17 | b | 73.95 | ||||||||
1957 | 46.45 | b | 56.64 | 62.23 | a | 68.46 | d | 75.84 | 92.70 | 97.23 | 94.13 | a | 88.67 | 71.03 | 51.32 | b | 49.68 | 71.20 | ||||||||
1958 | 49.16 | 57.44 | a | 55.58 | 69.87 | 87.55 | 96.17 | 98.68 | 98.97 | 87.76 | a | 74.97 | 58.47 | 53.83 | a | 74.04 | ||||||||||
1959 | 48.40 | a | 52.96 | 63.54 | c | 74.23 | 82.69 | e | 96.24 | a | 100.94 | 93.61 | 86.36 | b | 73.61 | 58.10 | a | 48.74 | 73.29 | |||||||
1960 | 40.90 | 48.59 | 65.59 | b | 74.07 | a | 83.13 | a | 95.36 | b | 100.87 | 98.74 | 90.33 | 69.27 | a | 57.64 | b | 40.07 | b | 72.05 | ||||||
1961 | 44.97 | 57.04 | b | 60.87 | 71.83 | 83.19 | 97.13 | 99.53 | a | 94.03 | 82.50 | 73.53 | a | 54.83 | 33.70 | a | 71.10 | |||||||||
1962 | 38.68 | 54.04 | 56.87 | a | 79.07 | 80.33 | d | 93.62 | i | ----- | z | 95.43 | x | 86.67 | l | 74.93 | d | 61.72 | a | 50.10 | 61.97 | d | ||||
1963 | 32.29 | g | 55.04 | a | 61.86 | b | 70.54 | b | 86.10 | a | 91.57 | b | 99.93 | c | 93.77 | e | 90.61 | b | 82.52 | b | 63.81 | d | 45.04 | c | 76.43 | a |
1964 | 47.21 | b | ----- | z | ----- | z | 70.16 | e | 83.00 | g | 91.83 | f | 99.77 | e | 93.15 | e | 87.67 | f | 79.70 | h | 54.29 | i | 43.90 | j | 77.57 | h |
1965 | 45.50 | k | 49.48 | g | 58.36 | i | 69.00 | g | 77.45 | 87.17 | a | 95.58 | 94.58 | 82.60 | 76.35 | 60.57 | 47.06 | 77.67 | d | |||||||
1966 | 43.16 | 45.61 | 64.48 | 74.73 | 87.29 | 94.29 | b | 99.87 | 97.00 | 87.70 | 74.16 | 62.67 | 44.16 | 72.93 | ||||||||||||
1967 | 45.16 | 58.43 | 67.90 | 69.10 | 80.16 | 87.70 | 99.23 | 95.61 | 86.70 | 77.58 | 63.70 | 40.80 | a | 72.67 | ||||||||||||
1968 | 37.39 | 57.10 | 64.19 | 67.33 | 78.89 | d | 93.93 | 97.03 | 89.55 | b | 86.17 | 74.84 | 56.27 | 38.52 | 70.10 | |||||||||||
1969 | 44.55 | 50.36 | 58.16 | 74.03 | 85.94 | 90.07 | 97.61 | 98.06 | 89.30 | ----- | z | ----- | z | 44.57 | x | 76.45 | c | |||||||||
1970 | 41.75 | c | 57.96 | 57.68 | 64.43 | 84.45 | 92.07 | 98.45 | 97.42 | 81.63 | 68.39 | 59.70 | 46.00 | 70.83 | ||||||||||||
1971 | 49.00 | 54.07 | 63.48 | 73.77 | 78.42 | e | 94.80 | 101.74 | 98.57 | h | 84.72 | a | 69.87 | 54.80 | 37.87 | 69.32 | a | |||||||||
1972 | 48.84 | 58.69 | 70.00 | y | 74.46 | b | 83.50 | a | 91.68 | b | 100.28 | b | 94.45 | 87.03 | 68.71 | 51.77 | 40.29 | 72.70 | a | |||||||
1973 | 32.03 | a | 46.26 | a | 54.32 | 65.37 | 80.37 | a | 90.40 | 97.97 | 96.16 | 84.92 | d | 76.54 | c | 62.15 | d | 48.00 | b | 69.54 | ||||||
1974 | 34.97 | 44.15 | a | 66.48 | 70.00 | 85.94 | 98.21 | a | 97.03 | 95.97 | 88.59 | a | 73.70 | a | 57.47 | 44.58 | 71.42 | |||||||||
1975 | 42.68 | 49.00 | 58.39 | 64.37 | 76.61 | 89.07 | 95.23 | 95.06 | 86.66 | a | 75.32 | 57.97 | 47.55 | b | 69.82 | |||||||||||
1976 | 46.61 | 56.90 | 59.67 | a | 70.50 | 81.42 | 91.10 | 98.35 | 90.94 | 82.67 | 70.48 | 60.00 | 46.61 | 71.27 | ||||||||||||
1977 | 33.45 | 55.00 | 57.55 | 73.47 | 78.16 | 96.00 | 96.03 | b | 94.97 | 89.90 | i | 75.97 | 59.40 | 51.65 | 70.15 | a | ||||||||||
1978 | 46.58 | 50.07 | 63.62 | b | 70.53 | 76.90 | 93.87 | 99.13 | 95.77 | 85.10 | 76.58 | 57.33 | 34.13 | 70.80 | ||||||||||||
1979 | 35.52 | 43.86 | 57.77 | 69.87 | 78.65 | 90.07 | 98.16 | 93.00 | 91.23 | 77.55 | 51.13 | 46.23 | 69.42 | |||||||||||||
1980 | 45.65 | 54.69 | 57.23 | 67.63 | 75.65 | 93.87 | 98.77 | 95.45 | 87.28 | a | 72.68 | 59.80 | 54.48 | 71.93 | ||||||||||||
1981 | 54.03 | 55.96 | 59.00 | 75.53 | 79.06 | 95.43 | 97.40 | a | 94.65 | 86.23 | 69.52 | 60.97 | 50.52 | 73.19 | ||||||||||||
1982 | 47.47 | a | 43.79 | 59.58 | 68.27 | 78.65 | 90.50 | 96.55 | 93.03 | 85.97 | 68.32 | 54.97 | 47.94 | 69.58 | ||||||||||||
1983 | 47.13 | 54.75 | 59.16 | 64.93 | 78.03 | 89.23 | 96.55 | 96.94 | 90.83 | 75.23 | 57.30 | 46.23 | 71.36 | |||||||||||||
1984 | 45.84 | 52.24 | 60.90 | 66.47 | 86.97 | 90.90 | 98.23 | 94.71 | 88.57 | 65.90 | 58.57 | 47.87 | 71.43 | |||||||||||||
1985 | 45.61 | 49.61 | 60.13 | 72.63 | 81.45 | 95.10 | 97.97 | 97.23 | 82.27 | 72.77 | 56.43 | 51.19 | 71.87 | |||||||||||||
1986 | 52.90 | 57.57 | 67.57 | a | 70.73 | 82.06 | 93.30 | 93.58 | 95.58 | 80.57 | 70.48 | 57.40 | 48.39 | 72.51 | ||||||||||||
1987 | 43.90 | 51.71 | 58.07 | a | 73.67 | 81.35 | 94.93 | 96.68 | 92.84 | 87.63 | 76.45 | 55.87 | 43.29 | 71.37 | ||||||||||||
1988 | 39.43 | a | 52.93 | 61.32 | 69.97 | 81.03 | 93.63 | 99.29 | 93.74 | 83.73 | 80.00 | 58.90 | 47.77 | 71.81 | ||||||||||||
1989 | 41.87 | 50.54 | 68.58 | 78.77 | 84.10 | 91.83 | 99.68 | 92.42 | 88.10 | 74.13 | 61.87 | 50.19 | 73.51 | |||||||||||||
1990 | 43.42 | 53.04 | 64.13 | 74.00 | 79.71 | 96.07 | 97.19 | 94.00 | 87.97 | 73.19 | 56.20 | 36.67 | a | 71.30 | ||||||||||||
1991 | 35.77 | 49.79 | 57.17 | a | 69.30 | 79.84 | 89.77 | 96.83 | a | 94.48 | 87.33 | 77.48 | 54.87 | 39.06 | 69.31 | |||||||||||
1992 | 42.19 | 53.62 | 62.81 | 76.57 | 81.52 | 90.33 | 93.00 | 94.71 | 86.93 | 77.90 | 53.37 | 32.65 | 70.47 | |||||||||||||
1993 | 45.42 | 51.71 | 63.81 | 71.63 | 82.03 | 90.53 | 97.39 | 92.67 | a | 87.40 | 71.35 | 53.87 | 47.00 | 71.23 | ||||||||||||
1994 | 50.87 | 49.96 | a | 66.94 | 71.40 | 82.83 | a | 97.73 | 100.61 | 97.61 | 88.93 | 71.68 | 54.67 | 47.84 | 73.42 | |||||||||||
1995 | 46.93 | a | 62.96 | 63.06 | 67.00 | 74.19 | 87.87 | 97.06 | 97.94 | 89.17 | 75.45 | 63.93 | 51.68 | 73.10 | ||||||||||||
1996 | 49.97 | 59.17 | 64.32 | 72.63 | 86.77 | 96.10 | 100.32 | 97.90 | 83.24 | a | 72.16 | 56.47 | 47.52 | 73.88 | ||||||||||||
1997 | 42.84 | 52.21 | 67.55 | 68.07 | 84.16 | 92.40 | 96.39 | 92.97 | 87.37 | 72.71 | 59.20 | 47.16 | 71.92 | |||||||||||||
1998 | 50.83 | a | 51.00 | 61.39 | 67.43 | 81.32 | 89.80 | 99.39 | 97.29 | 88.10 | 72.03 | 57.73 | 49.65 | 72.16 | ||||||||||||
1999 | 53.06 | 57.96 | 69.26 | 66.33 | 79.10 | 91.00 | 95.61 | 90.90 | 84.47 | 77.87 | 64.23 | 48.79 | b | 73.22 | ||||||||||||
2000 | 51.10 | 55.41 | 59.94 | 77.10 | a | 87.23 | 95.83 | 100.61 | 98.42 | 89.17 | 72.70 | a | 51.20 | 50.26 | 74.08 | |||||||||||
2001 | 46.94 | 52.43 | 63.61 | 73.53 | 86.74 | 95.80 | 98.61 | 96.32 | 92.73 | 75.77 | 52.23 | 35.48 | 72.52 | |||||||||||||
2002 | 38.90 | 44.57 | 52.06 | 75.80 | 84.48 | 98.50 | 101.87 | 97.26 | 85.20 | 71.39 | 58.10 | 47.48 | 71.30 | |||||||||||||
2003 | 54.45 | 52.75 | 61.81 | 72.03 | 84.39 | 93.97 | 103.81 | 97.10 | 88.30 | 79.58 | 55.80 | 48.61 | 74.38 | |||||||||||||
2004 | 45.65 | 48.28 | 70.39 | 70.79 | f | 84.32 | 94.70 | 98.58 | 95.35 | 84.77 | 71.81 | 55.40 | 46.29 | 72.32 | a | |||||||||||
2005 | 51.61 | 53.28 | c | 61.68 | 71.47 | 83.33 | a | 92.76 | a | 101.80 | a | 91.77 | 86.40 | 74.03 | 60.10 | 49.07 | a | 73.11 | ||||||||
2006 | 50.13 | 56.29 | 60.03 | a | 75.00 | a | 86.94 | 97.30 | 99.32 | 93.97 | 82.30 | 68.65 | 59.10 | 47.10 | 73.01 | |||||||||||
2007 | 43.00 | 54.25 | 66.90 | 73.03 | 83.35 | 96.62 | a | 100.71 | 96.55 | 88.27 | 73.81 | 63.23 | 42.23 | 73.50 | ||||||||||||
2008 | 41.03 | 50.21 | 63.29 | 71.67 | 79.55 | 94.30 | 99.34 | b | 97.42 | 88.73 | 75.10 | 60.90 | 45.26 | 72.23 | ||||||||||||
2009 | 51.23 | 56.07 | 65.68 | 70.07 | 85.45 | 88.17 | 100.74 | 96.71 | 88.03 | 70.61 | 60.13 | 40.19 | 72.76 | |||||||||||||
2010 | 36.16 | 48.39 | 59.45 | 70.77 | 77.83 | a | 93.97 | 98.40 | a | 91.32 | 89.80 | 73.65 | 55.13 | 51.16 | 70.50 | |||||||||||
2011 | 44.13 | a | 50.86 | 65.00 | 70.80 | 78.71 | 94.63 | 97.55 | 98.23 | 88.00 | a | 72.87 | 58.00 | 44.90 | 71.97 | |||||||||||
2012 | 50.45 | 52.24 | 67.77 | 76.47 | 87.74 | 100.00 | 98.26 | 98.29 | 89.13 | 77.29 | 63.50 | 46.65 | 75.65 | |||||||||||||
2013 | 41.35 | 50.32 | 66.32 | 73.63 | 82.80 | a | 99.27 | 99.60 | a | 94.29 | 86.20 | 70.71 | 56.70 | 42.94 | 72.01 | |||||||||||
2014 | 51.65 | 58.50 | 64.32 | 71.83 | 81.03 | 95.97 | 100.71 | 93.58 | 89.97 | 76.61 | 59.53 | 47.30 | a | 74.25 | ||||||||||||
2015 | 47.77 | a | 57.11 | 67.42 | 72.63 | 79.13 | 94.37 | 94.13 | 95.23 | 91.37 | 76.19 | 57.73 | 45.61 | 73.22 | ||||||||||||
2016 | 41.71 | 55.93 | 66.48 | 71.83 | 79.39 | 99.97 | a | 100.45 | 92.13 | 86.27 | 78.30 | a | 63.20 | 47.26 | 73.58 | |||||||||||
2017 | 45.87 | 57.57 | 69.03 | 70.60 | 79.33 | a | 99.10 | 100.48 | 96.35 | 87.63 | 75.68 | 64.40 | 51.61 | 74.81 | ||||||||||||
2018 | 52.42 | 56.25 | 64.45 | 74.64 | b | 87.35 | h | ----- | z | ----- | z | ----- | z | ----- | z | 67.64 | f | 55.73 | 44.40 | a | 57.98 | f | ||||
2019 | 42.38 | j | 44.43 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 45.22 | 53.16 | 62.47 | 71.65 | 81.78 | 93.57 | 98.51 | 95.12 | 87.45 | 74.19 | 58.00 | 46.12 | 72.21 | |||||||||||||
S.D. | 5.13 | 4.54 | 4.05 | 3.33 | 3.32 | 3.20 | 2.05 | 2.10 | 2.81 | 3.45 | 3.72 | 4.85 | 1.46 | |||||||||||||
SKEW | -0.46 | -0.19 | -0.28 | -0.13 | 0.04 | -0.01 | -0.28 | -0.31 | -0.31 | 0.06 | -0.05 | -0.88 | -0.08 | |||||||||||||
MAX | 54.45 | 65.18 | 70.39 | 79.07 | 87.74 | 100.00 | 103.81 | 98.97 | 93.53 | 82.52 | 64.40 | 55.25 | 75.65 | |||||||||||||
MIN | 32.03 | 43.52 | 52.06 | 64.37 | 74.19 | 87.17 | 93.00 | 89.55 | 80.57 | 65.90 | 50.80 | 32.65 | 69.31 | |||||||||||||
YRS | 71 | 71 | 68 | 69 | 69 | 68 | 69 | 70 | 68 | 67 | 70 | 70 | 55 |