YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.32 | 35.27 | 20.81 | 30.80 | i | |||
1950 | 0.13 | 22.18 | 30.74 | 36.27 | 43.65 | 52.95 | j | 55.85 | k | 56.68 | i | 48.33 | i | 41.18 | c | 28.13 | g | 29.50 | k | 29.02 | f | |||||
1951 | 20.86 | i | 23.61 | 24.87 | 35.00 | 45.03 | 50.40 | 54.68 | 54.26 | 47.33 | 39.84 | 27.27 | 15.07 | a | 37.94 | a | ||||||||||
1952 | 12.68 | 20.48 | 27.39 | 36.80 | 43.90 | 50.37 | 54.58 | 53.61 | 48.50 | 38.03 | 26.50 | b | 27.45 | 36.69 | ||||||||||||
1953 | 29.43 | a | 28.30 | a | 31.83 | b | 37.33 | 43.40 | f | 48.82 | b | 53.84 | 54.39 | 47.07 | a | 39.33 | a | 32.83 | 27.42 | 39.14 | a | |||||
1954 | 17.17 | a | 28.22 | a | 25.07 | a | 33.04 | b | 42.72 | b | 49.33 | 51.73 | a | ----- | z | 47.20 | 34.77 | 35.34 | a | 24.13 | 35.34 | a | ||||
1955 | 22.42 | 19.93 | 24.66 | b | 34.20 | 40.17 | a | 49.90 | a | 54.84 | 52.68 | 47.17 | 38.29 | 23.37 | 16.52 | 35.34 | ||||||||||
1956 | 20.81 | 10.72 | 27.23 | 37.87 | 45.65 | ----- | z | 55.94 | 53.03 | 45.38 | a | 38.35 | 27.41 | a | 25.00 | 35.22 | a | |||||||||
1957 | 7.17 | a | 18.64 | 31.03 | a | 38.73 | 48.60 | a | 51.07 | 53.29 | 52.90 | 51.70 | 40.39 | 30.30 | 29.00 | 37.74 | ||||||||||
1958 | 27.84 | 32.67 | a | 32.60 | a | 38.10 | 50.65 | 58.67 | 59.10 | 57.13 | 45.93 | 38.52 | 26.47 | 27.74 | 41.28 | |||||||||||
1959 | 22.48 | 20.46 | 31.73 | a | 38.38 | a | 44.77 | 52.66 | a | 56.87 | 55.29 | 48.67 | 37.65 | 24.00 | 26.81 | 38.31 | ||||||||||
1960 | 15.06 | 23.86 | 30.23 | 38.57 | 45.55 | 53.67 | 62.03 | 56.55 | 48.67 | 39.90 | 28.79 | a | 20.90 | 38.65 | ||||||||||||
1961 | 24.52 | 31.04 | 32.68 | 39.13 | 46.29 | 55.33 | 60.84 | 60.03 | 46.00 | 35.81 | 22.43 | 21.13 | 39.60 | |||||||||||||
1962 | 17.16 | 27.07 | 29.27 | a | 39.97 | 45.13 | 51.60 | 57.16 | 57.10 | 49.21 | a | 41.13 | 34.53 | 28.94 | 39.85 | |||||||||||
1963 | 16.74 | 31.81 | b | 34.06 | 40.07 | a | 46.74 | 53.53 | 57.50 | a | 58.10 | 52.97 | 41.74 | 33.33 | 23.00 | 40.80 | ||||||||||
1964 | 22.19 | 19.24 | ----- | z | 37.87 | 44.94 | 53.13 | 57.68 | 54.74 | 46.03 | 36.61 | 32.93 | 19.87 | 38.66 | a | |||||||||||
1965 | 23.26 | 24.46 | 27.81 | 42.10 | 44.94 | 53.10 | 58.90 | 59.68 | 45.97 | 37.71 | 33.30 | 24.74 | 39.66 | |||||||||||||
1966 | 17.81 | 25.39 | 31.26 | 38.23 | 45.13 | 49.27 | 56.55 | 56.97 | 51.70 | 38.42 | 33.50 | 29.90 | 39.51 | |||||||||||||
1967 | 28.32 | 30.43 | 31.26 | 35.87 | 45.23 | 54.87 | 58.77 | 59.94 | 53.13 | 39.61 | 30.66 | a | 21.42 | 40.79 | ||||||||||||
1968 | 20.90 | 27.72 | 33.10 | 34.73 | 44.26 | 51.31 | a | 57.94 | 53.84 | 48.40 | 35.97 | 32.60 | 21.29 | 38.50 | ||||||||||||
1969 | 7.61 | 17.46 | 28.20 | a | 40.63 | 47.43 | a | 55.93 | 56.68 | 52.87 | 48.62 | a | 35.57 | a | 30.34 | a | 28.23 | 37.47 | ||||||||
1970 | 18.61 | 27.00 | a | 31.58 | 35.40 | 45.87 | 57.03 | 59.23 | 56.71 | 43.57 | 34.97 | 28.03 | 17.57 | a | 37.96 | |||||||||||
1971 | 19.30 | a | 25.50 | 28.32 | 39.00 | 48.42 | 51.00 | 57.90 | 58.52 | 43.17 | 34.94 | 32.00 | 14.65 | 37.73 | ||||||||||||
1972 | 14.00 | 23.55 | 34.03 | 33.13 | 47.65 | 52.40 | ----- | z | 57.94 | 44.57 | 35.23 | a | 36.17 | 21.13 | 36.34 | a | ||||||||||
1973 | 18.06 | 24.75 | 34.23 | 39.97 | 45.23 | ----- | z | 59.68 | 57.94 | 49.50 | 38.97 | 28.97 | ----- | z | 39.73 | b | ||||||||||
1974 | 17.94 | 29.33 | a | 31.29 | 39.93 | 42.71 | 53.86 | a | 57.37 | a | 58.10 | 46.60 | 34.81 | 33.13 | 27.61 | 39.39 | ||||||||||
1975 | 15.97 | 15.11 | 28.68 | 35.37 | 43.81 | 49.83 | 61.45 | 55.58 | 47.33 | 39.53 | a | 29.97 | 23.58 | 37.18 | ||||||||||||
1976 | 22.71 | 26.82 | a | 28.97 | 37.73 | 44.74 | 49.17 | 56.94 | 56.65 | 50.27 | 36.77 | 28.37 | 23.52 | 38.55 | ||||||||||||
1977 | 17.19 | ----- | z | 33.29 | 39.03 | 43.23 | 56.59 | a | 57.52 | 62.29 | 46.00 | 36.35 | 27.90 | 22.90 | 40.21 | a | ||||||||||
1978 | 21.57 | a | 28.11 | 33.81 | 39.70 | 44.10 | 52.87 | 59.71 | 57.68 | 48.70 | 34.45 | 25.34 | a | 14.29 | 38.36 | |||||||||||
1979 | 5.26 | 19.58 | b | 31.74 | 36.23 | 46.13 | 54.70 | 60.55 | 59.00 | a | 49.47 | 42.45 | 28.20 | 28.55 | 38.49 | |||||||||||
1980 | 10.32 | 25.72 | 30.52 | 39.63 | 48.29 | 49.50 | 54.48 | 52.74 | 48.90 | 37.48 | 33.45 | a | 24.45 | 37.96 | ||||||||||||
1981 | 31.90 | 28.68 | 34.03 | 37.43 | 46.48 | 49.40 | 56.84 | 58.97 | 47.30 | 37.07 | a | 33.57 | 22.90 | 40.38 | ||||||||||||
1982 | 17.16 | 23.29 | 32.10 | 34.00 | 43.61 | 56.11 | b | 56.24 | b | 56.41 | b | 48.52 | a | 37.16 | 26.32 | b | 21.55 | 37.71 | ||||||||
1983 | 27.84 | 30.44 | a | 36.58 | 37.53 | 44.93 | a | 51.97 | 53.68 | 58.71 | 44.67 | 34.29 | 34.37 | 14.39 | 39.12 | |||||||||||
1984 | 23.13 | 29.07 | 35.39 | 37.60 | 43.55 | 51.07 | 55.29 | 56.10 | 42.77 | 32.73 | a | 30.30 | 10.30 | a | 37.27 | |||||||||||
1985 | 17.81 | 11.86 | 26.42 | 39.57 | 48.90 | a | 53.62 | a | 61.52 | 55.97 | 46.79 | a | 39.35 | 14.87 | 17.52 | 36.18 | ||||||||||
1986 | 20.65 | 22.00 | a | 35.06 | 38.23 | 46.03 | 55.69 | a | 56.29 | 60.94 | 48.50 | 39.81 | 32.37 | 26.35 | 40.16 | |||||||||||
1987 | 21.32 | 29.11 | 35.29 | 42.60 | 47.35 | 54.53 | 58.61 | 57.31 | b | 51.72 | a | 37.58 | 33.47 | 23.77 | 41.06 | |||||||||||
1988 | 18.23 | 26.25 | a | 33.19 | 41.27 | 44.68 | 52.37 | 58.00 | 56.06 | 49.70 | 41.39 | 33.43 | 23.77 | 39.86 | ||||||||||||
1989 | 22.87 | 15.63 | a | 30.72 | b | 39.73 | 46.13 | 56.17 | 57.26 | 56.26 | 46.77 | 37.35 | 32.79 | a | 27.40 | a | 39.09 | |||||||||
1990 | 28.67 | a | 21.25 | 32.19 | 41.97 | 45.61 | 52.47 | 61.45 | 60.00 | 53.15 | d | 38.69 | e | 34.23 | h | 17.05 | j | 43.55 | b | |||||||
1991 | 16.00 | 31.57 | ----- | z | 37.83 | 46.87 | a | 50.14 | b | 60.20 | a | 61.13 | a | 52.56 | c | 35.26 | 31.40 | 29.13 | a | 41.10 | a | |||||
1992 | 26.77 | 33.48 | 36.32 | 40.00 | a | 47.79 | c | 58.03 | 59.43 | a | 56.53 | a | 48.46 | b | 39.71 | 30.83 | 13.39 | 40.90 | ||||||||
1993 | 13.87 | 19.88 | b | 27.68 | 36.23 | 48.29 | 51.33 | 54.45 | 54.73 | a | 44.80 | 38.07 | a | 19.07 | 25.71 | 36.18 | ||||||||||
1994 | 27.32 | 25.07 | 28.90 | 35.03 | 43.07 | a | 47.30 | 57.77 | 54.65 | 47.10 | 35.06 | 25.00 | b | 17.52 | 36.98 | |||||||||||
1995 | 23.16 | 28.57 | 32.42 | 38.57 | 48.00 | 53.17 | 59.29 | 53.10 | 51.21 | b | 37.52 | 31.87 | 26.74 | 40.30 | ||||||||||||
1996 | 17.87 | 21.00 | 31.74 | 39.00 | 43.03 | 51.39 | b | 59.96 | c | 58.86 | b | 48.40 | 39.00 | b | 26.68 | e | 17.29 | c | 37.85 | |||||||
1997 | 18.83 | a | 22.28 | c | 32.30 | d | 38.57 | b | 49.75 | g | 56.75 | j | 64.67 | j | 67.11 | l | 57.15 | j | 44.26 | h | 32.60 | e | 26.82 | c | 28.57 | f |
1998 | 22.79 | c | 32.48 | c | 34.06 | 39.38 | a | 48.23 | 54.33 | 62.37 | a | 58.19 | 53.86 | a | 36.55 | 35.23 | 22.16 | 41.64 | ||||||||
1999 | 27.68 | 28.33 | a | 32.58 | 35.27 | 41.40 | a | 50.67 | 55.29 | 59.74 | 45.83 | 36.48 | 35.30 | 29.26 | 39.82 | |||||||||||
2000 | 22.45 | 25.38 | 32.97 | 38.93 | 44.84 | 52.87 | 55.87 | a | 54.97 | 47.10 | 37.13 | 25.55 | a | 20.70 | a | 38.23 | ||||||||||
2001 | 23.50 | a | 22.44 | a | 30.87 | 38.33 | 46.00 | 50.97 | 56.90 | 58.19 | 50.50 | 36.68 | 33.17 | 25.87 | a | 39.45 | ||||||||||
2002 | 25.81 | 25.50 | 27.37 | a | 37.97 | 44.48 | 52.13 | 59.48 | 55.03 | 47.60 | 31.65 | 30.13 | 31.29 | 39.04 | ||||||||||||
2003 | 28.94 | 26.14 | 32.84 | 37.97 | 44.58 | 53.24 | a | 59.52 | 57.68 | 50.62 | a | 42.16 | 23.50 | 21.48 | 39.89 | |||||||||||
2004 | 23.74 | 26.62 | 34.74 | 38.33 | 46.00 | a | 53.40 | 60.58 | 60.58 | 48.50 | 40.48 | 30.33 | 28.16 | 40.96 | ||||||||||||
2005 | 21.13 | 23.68 | 33.42 | 38.97 | 47.87 | 51.48 | a | 58.07 | a | 56.94 | 48.10 | 41.52 | 29.97 | 20.13 | 39.27 | |||||||||||
2006 | 28.68 | 24.50 | 31.65 | 39.10 | 45.65 | 53.80 | 60.23 | 55.45 | 48.17 | 38.06 | 28.63 | 20.52 | 39.54 | |||||||||||||
2007 | 17.97 | a | 29.71 | 33.97 | 37.37 | 45.61 | 51.30 | 61.42 | 55.94 | 47.57 | 37.39 | 28.37 | 21.39 | 39.00 | ||||||||||||
2008 | 15.05 | i | 23.31 | 30.97 | 34.17 | 46.55 | 50.27 | 57.52 | 56.52 | b | 46.21 | a | 38.26 | 32.23 | 14.77 | 39.16 | a | |||||||||
2009 | 17.29 | 19.88 | d | 26.87 | 36.25 | b | 44.77 | 53.87 | 59.61 | 58.16 | 49.60 | 35.23 | 30.57 | b | 15.52 | 37.30 | ||||||||||
2010 | 27.45 | 30.46 | 31.42 | 38.17 | 40.59 | d | 47.83 | 56.03 | 52.29 | 48.67 | 39.90 | 22.00 | a | 20.47 | a | 37.94 | ||||||||||
2011 | 19.10 | 19.18 | 30.52 | 32.93 | 40.94 | 47.73 | 48.97 | 55.74 | 49.76 | a | 38.81 | 25.70 | 21.26 | 35.89 | ||||||||||||
2012 | 18.55 | 24.38 | 29.84 | 37.20 | 42.55 | 49.23 | 57.68 | 59.14 | b | 47.53 | 38.90 | a | 33.59 | a | 27.30 | a | 38.82 | |||||||||
2013 | 20.32 | 25.79 | 29.13 | 33.48 | c | 37.96 | c | 53.63 | 60.77 | a | 57.52 | 50.38 | d | 35.45 | 25.90 | a | 18.42 | 37.40 | ||||||||
2014 | 26.16 | 21.46 | 31.10 | 37.83 | 45.64 | c | 53.43 | 60.35 | 59.81 | 50.07 | 43.83 | a | 26.48 | a | 25.57 | a | 40.15 | |||||||||
2015 | 27.32 | c | 32.16 | c | 36.52 | 34.79 | b | 46.80 | a | 57.28 | a | 62.29 | 59.13 | 47.93 | a | 43.65 | 29.10 | 21.91 | t | 43.36 | a | |||||
2016 | 25.61 | 26.90 | i | 35.00 | 41.19 | d | 47.90 | 53.00 | 58.06 | 56.10 | j | 46.42 | d | 42.27 | a | 38.13 | 15.48 | 40.31 | b | |||||||
2017 | 16.17 | a | 19.00 | 32.68 | 38.40 | 46.13 | a | 51.86 | a | 57.70 | k | 58.50 | m | 48.36 | h | 35.54 | c | 31.24 | e | 23.71 | g | 33.88 | d | |||
2018 | 25.59 | b | 20.23 | b | 30.13 | 39.73 | 51.10 | 51.37 | 60.32 | 58.32 | 52.91 | s | 34.77 | 30.40 | 27.29 | 39.02 | a | |||||||||
2019 | 25.94 | 17.14 | 24.26 | 40.40 | 48.58 | 52.43 | 58.10 | 59.45 | 52.07 | 35.45 | 29.33 | 27.16 | 39.19 | |||||||||||||
2020 | 26.06 | 25.86 | 30.16 | 36.97 | 45.81 | 52.40 | 58.71 | 58.87 | 52.63 | 41.32 | ----- | z | ----- | z | 42.88 | b | ||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.67 | 24.53 | 31.23 | 37.84 | 45.44 | 52.44 | 57.88 | 56.96 | 48.35 | 37.92 | 29.80 | 22.67 | 38.80 | |||||||||||||
S.D. | 6.11 | 4.99 | 2.92 | 2.24 | 2.36 | 2.52 | 2.63 | 2.38 | 2.50 | 2.56 | 4.24 | 4.90 | 1.48 | |||||||||||||
SKEW | -0.83 | -0.44 | -0.45 | -0.35 | -0.40 | 0.29 | -0.68 | -0.13 | 0.16 | 0.15 | -0.87 | -0.42 | -0.22 | |||||||||||||
MAX | 31.90 | 33.48 | 36.58 | 42.60 | 51.10 | 58.67 | 62.37 | 62.29 | 53.86 | 43.83 | 38.13 | 31.29 | 41.64 | |||||||||||||
MIN | 0.13 | 10.72 | 24.26 | 32.93 | 37.96 | 47.30 | 48.97 | 52.29 | 42.77 | 31.65 | 14.87 | 10.30 | 35.34 | |||||||||||||
YRS | 69 | 69 | 69 | 71 | 69 | 67 | 67 | 66 | 67 | 71 | 69 | 66 | 53 |