YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1946 | ----- | z | ----- | z | ----- | z | 67.25 | j | 76.37 | a | 75.65 | g | 86.79 | b | 87.61 | 75.14 | b | 59.63 | a | 47.07 | b | 42.97 | b | 67.94 | e | |
1947 | 38.68 | 49.89 | a | 60.32 | c | 67.42 | d | 79.06 | 75.28 | a | 84.48 | d | 83.11 | d | 76.17 | 59.89 | c | 48.17 | a | 41.53 | a | 63.67 | ||||
1948 | 39.59 | d | 42.17 | e | ----- | z | ----- | z | ----- | z | 81.27 | 81.07 | a | 79.97 | a | 72.40 | 61.68 | 47.40 | 33.24 | b | 59.86 | c | ||||
1949 | 26.03 | 39.93 | 51.32 | 66.93 | 75.03 | 78.20 | 80.10 | 82.06 | 76.93 | 60.00 | 51.77 | 40.90 | 60.77 | |||||||||||||
1950 | 22.10 | 39.25 | 48.57 | a | 58.90 | a | 67.58 | 75.47 | 86.90 | 87.61 | 79.40 | 58.86 | c | 44.96 | b | 41.61 | 59.27 | |||||||||
1951 | 38.13 | a | 46.04 | d | 49.03 | 65.77 | 70.48 | 77.83 | 87.23 | 84.00 | 77.37 | 58.90 | 46.37 | 32.06 | 61.10 | |||||||||||
1952 | 29.94 | 42.14 | 50.97 | a | 65.23 | 71.13 | 74.47 | 87.74 | 84.16 | 81.60 | 72.10 | a | 42.37 | 36.71 | 61.55 | |||||||||||
1953 | 47.13 | 49.64 | 54.90 | 59.00 | 66.74 | 71.93 | 86.47 | a | 83.03 | a | 78.70 | 67.48 | 51.03 | a | 44.74 | 63.40 | ||||||||||
1954 | 35.03 | a | 40.79 | 49.10 | 58.57 | b | 70.23 | 72.10 | 82.48 | b | 78.33 | a | 72.60 | 59.42 | 50.73 | 37.94 | 58.94 | |||||||||
1955 | 33.73 | a | 41.86 | 46.70 | a | 54.03 | a | 64.27 | a | 77.53 | 81.42 | 84.65 | e | 74.07 | 59.58 | 39.27 | 33.21 | b | 57.53 | |||||||
1956 | 35.45 | 33.14 | 49.90 | 65.31 | a | 72.77 | a | 71.93 | 85.10 | a | 82.00 | a | 73.67 | 57.94 | 40.37 | 36.55 | 58.68 | |||||||||
1957 | 21.90 | b | 40.79 | 48.77 | a | 61.93 | 71.84 | 78.03 | a | 81.40 | a | 80.00 | 77.90 | 55.74 | 48.53 | 44.77 | 59.30 | |||||||||
1958 | 42.32 | 50.64 | 51.16 | 58.97 | a | 78.16 | 82.23 | 90.90 | a | 89.13 | 73.33 | 65.87 | 46.25 | b | 38.65 | 63.97 | ||||||||||
1959 | 36.50 | a | 41.93 | 52.77 | 62.73 | 65.55 | 76.21 | b | 87.71 | 81.71 | 69.07 | 62.84 | 46.60 | 38.87 | a | 60.21 | ||||||||||
1960 | 31.81 | 42.21 | 51.68 | 60.00 | 65.57 | a | 80.86 | a | 92.81 | 81.37 | a | 78.60 | 65.13 | 49.27 | 33.68 | 61.08 | ||||||||||
1961 | 39.93 | a | 49.21 | 53.10 | a | 60.03 | a | 70.00 | b | 85.27 | 90.32 | 91.90 | a | 72.62 | a | 61.42 | 44.07 | 39.55 | 63.12 | |||||||
1962 | 38.19 | 43.61 | 50.87 | 66.33 | 64.81 | 79.03 | 86.47 | a | 81.96 | e | 80.11 | b | 63.29 | 50.48 | a | 42.45 | 62.30 | |||||||||
1963 | 35.06 | 49.39 | 54.65 | 56.77 | 69.93 | b | 76.80 | 78.53 | a | 83.90 | 83.31 | a | 66.65 | 49.93 | 35.23 | a | 61.68 | |||||||||
1964 | 42.84 | 48.83 | 51.35 | 58.66 | a | 67.66 | b | 74.70 | 83.58 | 78.52 | 72.30 | 62.71 | 42.70 | 31.87 | 59.64 | |||||||||||
1965 | 36.52 | 48.74 | a | 53.48 | 62.20 | 68.52 | 79.67 | 86.30 | a | 84.06 | 74.07 | 66.10 | a | 46.93 | 38.50 | a | 62.09 | |||||||||
1966 | 37.55 | 44.56 | a | 52.58 | 62.96 | c | 72.65 | 73.37 | 80.93 | a | 84.35 | 76.47 | 63.48 | 50.27 | 43.40 | a | 61.88 | |||||||||
1967 | 45.74 | 52.18 | 51.52 | 55.18 | b | 69.55 | 80.93 | a | 87.52 | 93.03 | a | 82.50 | 63.07 | a | 48.30 | 41.42 | 64.24 | |||||||||
1968 | 40.10 | b | 47.76 | 55.42 | 60.40 | 70.27 | a | 77.07 | 86.59 | b | 77.77 | 74.47 | 57.71 | 45.00 | 33.26 | 60.48 | ||||||||||
1969 | 24.90 | 36.64 | 53.32 | 60.83 | a | 74.20 | a | 82.20 | 84.45 | 82.16 | 74.27 | 59.19 | 48.23 | 34.81 | 59.60 | |||||||||||
1970 | 32.90 | 44.86 | 52.16 | 55.50 | 70.35 | 81.60 | 85.30 | a | 85.10 | a | 70.03 | 59.65 | 45.07 | 34.06 | 59.72 | |||||||||||
1971 | 42.35 | 46.68 | 47.87 | 59.97 | a | 70.97 | 71.00 | 86.77 | 90.39 | 69.73 | 59.87 | 48.37 | 35.13 | 60.76 | ||||||||||||
1972 | 36.42 | 41.76 | 54.52 | 57.57 | 71.80 | a | 77.43 | 83.81 | 86.10 | 69.90 | 62.68 | 45.31 | a | 32.87 | 60.01 | |||||||||||
1973 | 34.19 | 42.36 | 54.29 | 64.13 | 73.29 | 78.63 | 87.37 | a | 84.55 | 75.87 | 60.45 | 40.93 | a | 41.03 | a | 61.42 | ||||||||||
1974 | 34.87 | 47.46 | 53.23 | 59.59 | a | 65.63 | a | 82.17 | 82.55 | 86.06 | 79.60 | 65.06 | 46.40 | 40.06 | 61.89 | |||||||||||
1975 | 35.61 | 39.14 | 49.00 | 56.87 | 68.45 | 75.13 | 87.23 | 78.94 | 78.23 | 58.32 | 48.07 | 39.42 | 59.53 | |||||||||||||
1976 | 41.52 | 43.14 | 51.12 | e | 58.80 | 70.45 | 74.36 | e | 83.03 | 78.87 | 79.10 | a | 63.81 | 49.00 | a | 38.61 | 60.98 | |||||||||
1977 | 29.21 | b | 46.77 | b | 51.68 | 67.21 | a | 63.81 | 81.57 | b | 81.81 | 85.97 | b | 68.47 | 61.74 | 43.90 | 38.71 | 60.07 | ||||||||
1978 | 35.86 | b | 42.32 | 55.17 | a | 58.63 | 66.19 | 79.57 | 84.23 | 80.13 | a | 70.24 | a | 61.58 | e | 40.43 | b | 34.45 | 59.07 | |||||||
1979 | 21.65 | 39.89 | 55.23 | 60.07 | 72.16 | 79.52 | a | 85.93 | a | 82.23 | 77.83 | 64.13 | 38.60 | 39.28 | b | 59.71 | ||||||||||
1980 | 27.00 | 36.07 | b | 50.84 | 62.53 | 67.68 | 71.27 | 81.86 | b | 79.00 | 74.17 | 62.45 | 45.20 | 40.94 | 58.25 | |||||||||||
1981 | 40.45 | 44.29 | ----- | z | 60.33 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.36 | i | |||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.29 | c | 48.37 | 26.94 | 45.86 | i | ||
1984 | 38.55 | 44.00 | 55.55 | 58.03 | a | 65.41 | b | 74.79 | b | 87.26 | d | 85.70 | d | 72.07 | 58.29 | 44.69 | a | 31.19 | 59.63 | |||||||
1985 | 27.90 | 39.39 | 54.00 | a | 66.07 | 73.71 | 79.37 | 92.68 | 83.13 | 69.07 | 60.68 | 31.67 | 23.52 | 58.43 | ||||||||||||
1986 | 37.55 | 44.04 | 57.26 | 61.47 | 71.13 | 83.97 | 81.10 | 90.30 | a | 70.13 | 65.84 | 46.87 | 32.45 | 61.84 | ||||||||||||
1987 | 34.26 | 46.57 | 54.71 | 66.87 | 74.55 | 83.17 | 82.65 | 85.81 | 81.83 | 68.55 | 51.23 | 35.65 | 63.82 | |||||||||||||
1988 | 35.81 | 51.24 | 55.71 | 64.73 | 70.94 | 77.47 | 86.68 | 85.00 | 76.97 | 70.94 | 49.53 | 35.94 | 63.41 | |||||||||||||
1989 | 43.32 | 34.46 | 50.45 | 66.00 | 70.71 | 81.10 | a | 85.81 | 81.77 | 78.30 | 62.23 | 51.03 | 36.06 | 61.77 | ||||||||||||
1990 | 43.71 | 46.04 | 57.55 | 67.43 | 69.53 | a | 77.67 | 89.29 | 85.68 | 83.97 | 60.48 | 53.50 | 32.45 | 63.94 | ||||||||||||
1991 | 37.06 | 53.18 | 52.20 | a | 62.52 | a | 68.39 | 73.57 | 87.10 | 87.20 | a | 81.23 | 64.69 | b | 45.29 | b | 42.26 | 62.89 | ||||||||
1992 | 41.42 | 47.69 | 60.45 | 63.73 | 77.48 | 85.17 | a | 85.26 | 86.32 | 74.30 | 64.26 | 43.97 | 33.58 | 63.64 | ||||||||||||
1993 | 28.16 | 35.54 | 49.45 | 60.17 | 76.13 | 77.53 | 77.77 | 82.90 | 78.69 | a | 66.13 | 44.97 | 36.65 | 59.51 | ||||||||||||
1994 | 45.73 | a | 41.12 | b | 58.81 | 65.97 | 73.39 | 78.97 | 90.68 | 86.29 | 81.83 | 63.16 | 44.83 | 39.55 | 64.19 | |||||||||||
1995 | 37.39 | 49.96 | 53.32 | 60.77 | 72.16 | 75.87 | 85.32 | 80.87 | a | 78.83 | 59.74 | 50.43 | 36.24 | b | 61.74 | |||||||||||
1996 | 34.23 | e | ----- | z | ----- | z | 63.14 | b | 65.97 | a | 78.30 | 89.32 | 87.41 | b | 73.41 | a | 60.32 | 44.79 | a | 32.63 | a | 62.95 | b | |||
1997 | 35.90 | 44.18 | 53.68 | 60.40 | 73.52 | b | 76.47 | 84.20 | a | 87.10 | 75.43 | 60.87 | 48.93 | ----- | z | 63.70 | a | |||||||||
1998 | 39.06 | 46.82 | 55.13 | ----- | z | 70.48 | 79.07 | 91.43 | a | 89.35 | 82.53 | 61.06 | 49.90 | a | 39.26 | 64.01 | a | |||||||||
1999 | 43.74 | 46.21 | 53.45 | 61.67 | 68.06 | 77.03 | 84.61 | 86.00 | 76.87 | 62.19 | 52.30 | 41.55 | 62.81 | |||||||||||||
2000 | 36.65 | 43.34 | 53.37 | a | 65.70 | 70.13 | 79.93 | 85.06 | 86.10 | 74.57 | 61.42 | 39.27 | 31.45 | 60.58 | ||||||||||||
2001 | 35.81 | 42.46 | 56.52 | 60.43 | 74.65 | 75.67 | 85.63 | a | 87.65 | 79.93 | 62.26 | 49.24 | a | 39.63 | a | 62.49 | ||||||||||
2002 | 43.14 | b | 47.00 | 51.65 | 63.23 | 68.71 | 80.30 | 90.16 | 84.65 | 77.24 | a | 63.07 | a | 49.93 | 38.74 | 63.15 | ||||||||||
2003 | 41.55 | 47.79 | 57.00 | 60.30 | 69.39 | 81.93 | 90.97 | 86.97 | a | 79.63 | 67.70 | a | 44.97 | 36.16 | 63.70 | |||||||||||
2004 | 32.45 | 44.28 | 58.97 | 65.73 | 69.19 | 80.33 | 88.87 | 86.90 | 74.80 | 63.32 | 48.90 | 41.74 | 62.96 | |||||||||||||
2005 | 37.06 | 49.21 | 58.77 | 62.57 | 72.58 | 76.73 | 88.35 | 88.45 | 74.73 | 62.19 | 42.63 | 32.55 | 62.15 | |||||||||||||
2006 | 42.68 | 45.25 | 52.74 | 61.33 | 71.74 | 79.17 | 90.35 | 86.13 | 78.70 | 62.39 | 45.63 | 33.29 | 62.45 | |||||||||||||
2007 | 35.10 | 43.25 | 56.61 | 60.80 | 73.94 | 77.93 | 90.03 | 84.32 | 75.73 | 60.06 | 46.50 | 37.52 | 61.82 | |||||||||||||
2008 | 33.65 | 47.24 | 51.80 | a | 58.37 | 72.07 | a | 78.53 | 88.16 | 85.13 | 77.47 | 62.52 | 49.57 | 31.74 | 61.35 | |||||||||||
2009 | 36.65 | 41.93 | 50.16 | 62.10 | 72.97 | 81.23 | 91.32 | 87.55 | 80.13 | 57.97 | 50.10 | 31.81 | 61.99 | |||||||||||||
2010 | 40.58 | 47.93 | 55.48 | 59.87 | 64.90 | 70.53 | 87.87 | 84.29 | 74.17 | 62.55 | 43.23 | 37.00 | 60.70 | |||||||||||||
2011 | 40.10 | 44.04 | 51.61 | 57.10 | 66.61 | 75.67 | 82.00 | d | 87.88 | f | 81.80 | 60.68 | 47.27 | 36.74 | 58.51 | a | ||||||||||
2012 | 39.03 | 45.31 | 51.97 | 63.27 | 69.71 | 70.25 | r | ----- | z | 87.58 | 79.97 | 63.04 | d | 47.53 | 38.97 | 58.64 | b | |||||||||
2013 | 34.42 | 49.29 | 54.97 | 62.90 | 72.42 | 78.80 | 91.77 | 86.81 | 76.97 | 62.27 | a | 46.53 | 36.48 | 62.80 | ||||||||||||
2014 | 38.48 | 38.39 | 55.35 | 63.47 | 73.94 | 79.27 | 92.84 | 88.29 | 76.97 | 65.65 | 45.11 | b | 40.65 | 63.20 | ||||||||||||
2015 | 37.94 | 51.44 | a | 61.10 | a | 63.47 | 75.81 | 88.50 | 90.77 | 87.90 | 75.23 | 67.58 | 45.67 | 37.03 | 65.20 | |||||||||||
2016 | 35.68 | 49.55 | 54.71 | 69.73 | 74.26 | 81.43 | 85.77 | 87.45 | 75.03 | 58.32 | 52.73 | 32.94 | 63.13 | |||||||||||||
2017 | 26.03 | b | 36.75 | 51.44 | d | ----- | z | ----- | z | ----- | z | ----- | z | 86.83 | m | 77.27 | 60.71 | 46.60 | 33.87 | 47.53 | e | |||||
2018 | 41.90 | 46.21 | 53.26 | 60.97 | 77.53 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.59 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 36.34 | 44.45 | 53.37 | 61.79 | 70.71 | 78.18 | 86.24 | 84.79 | 76.32 | 62.34 | 46.59 | 36.76 | 61.50 | |||||||||||||
S.D. | 5.73 | 4.49 | 3.13 | 3.37 | 3.52 | 3.63 | 3.59 | 3.37 | 3.80 | 3.14 | 3.80 | 4.15 | 1.78 | |||||||||||||
SKEW | -0.72 | -0.37 | 0.39 | 0.07 | 0.08 | 0.08 | -0.14 | -0.11 | -0.14 | 0.73 | -1.03 | -0.38 | -0.14 | |||||||||||||
MAX | 47.13 | 53.18 | 61.10 | 69.73 | 79.06 | 88.50 | 92.84 | 93.03 | 83.97 | 72.10 | 53.50 | 44.77 | 65.20 | |||||||||||||
MIN | 21.65 | 33.14 | 46.70 | 54.03 | 63.81 | 70.53 | 77.77 | 77.77 | 68.47 | 55.74 | 31.67 | 23.52 | 57.53 | |||||||||||||
YRS | 70 | 69 | 67 | 67 | 67 | 66 | 67 | 67 | 69 | 70 | 70 | 69 | 61 |