YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.56 | 59.29 | 54.70 | 41.65 | 30.93 | 25.73 | 45.98 | f | ||||||
1940 | 17.77 | 24.59 | 30.97 | 39.50 | 49.45 | 57.65 | 62.97 | a | 59.80 | a | 54.92 | 44.24 | 26.03 | a | 23.92 | a | 40.98 | |||||||||
1941 | 15.58 | a | 23.71 | 28.65 | a | 37.40 | 50.15 | 53.78 | 60.24 | 58.83 | b | 51.57 | 42.81 | b | 29.53 | 21.87 | 39.51 | |||||||||
1942 | 11.90 | 10.86 | 20.55 | a | 39.57 | 46.19 | d | 53.52 | 59.90 | 59.00 | 50.79 | a | 42.50 | 31.72 | 20.17 | b | 37.22 | |||||||||
1943 | 18.98 | 22.89 | a | 26.48 | a | 45.00 | b | 47.05 | 54.58 | 61.40 | 60.64 | c | 52.78 | 42.26 | 30.57 | 20.18 | 40.23 | |||||||||
1944 | 13.47 | 21.91 | 27.27 | 35.48 | 47.45 | 55.07 | 60.13 | 61.05 | 54.33 | 44.89 | 31.67 | 21.18 | 39.49 | |||||||||||||
1945 | 22.18 | 26.71 | 28.44 | 33.35 | 47.92 | a | 51.13 | 60.00 | 60.84 | 53.12 | 45.50 | 28.75 | 19.37 | a | 39.77 | |||||||||||
1946 | 14.39 | 20.69 | a | 34.05 | 44.53 | 45.50 | 56.92 | 62.34 | 61.26 | 54.22 | 41.63 | 26.67 | 27.18 | 40.78 | ||||||||||||
1947 | 17.74 | 25.77 | 29.56 | 38.10 | a | 49.90 | 53.37 | 61.68 | 61.27 | 56.32 | 45.71 | 24.18 | 18.85 | 40.21 | ||||||||||||
1948 | 16.47 | 17.90 | 22.63 | a | 39.33 | 49.08 | 56.38 | a | 60.77 | 58.95 | a | 55.68 | 41.74 | 24.55 | 18.79 | 38.52 | ||||||||||
1949 | 6.34 | 15.82 | 30.85 | 40.48 | 47.55 | 55.65 | 60.19 | 58.87 | 52.43 | 40.05 | a | 35.77 | 22.48 | 38.87 | ||||||||||||
1950 | 20.16 | 21.07 | 28.21 | 39.38 | 44.68 | 54.90 | a | 58.27 | 56.10 | 51.38 | 46.35 | 31.28 | a | 22.95 | a | 39.56 | ||||||||||
1951 | 17.64 | b | 22.33 | a | 27.47 | 38.08 | 47.98 | 51.85 | 62.13 | 58.58 | 53.07 | 42.15 | 25.82 | 20.91 | b | 39.00 | ||||||||||
1952 | 13.10 | 15.57 | 20.63 | 38.28 | 48.02 | 58.20 | 59.32 | a | 58.85 | a | 55.48 | 46.03 | 22.95 | 13.69 | 37.51 | |||||||||||
1953 | 26.42 | 19.46 | 31.85 | 36.32 | 44.77 | 58.43 | 63.78 | b | 60.35 | 54.64 | a | 43.50 | 34.28 | 21.73 | 41.30 | |||||||||||
1954 | 28.58 | 31.54 | 30.79 | 46.27 | 51.82 | 60.36 | a | 67.66 | 63.00 | a | 56.76 | a | 46.38 | a | 35.43 | 15.82 | c | 44.53 | ||||||||
1955 | 14.64 | b | 14.56 | a | 27.29 | 37.58 | 49.02 | 54.40 | a | 63.02 | 61.70 | a | 56.02 | 45.53 | 29.18 | 28.29 | 40.10 | |||||||||
1956 | 26.66 | 14.12 | a | 27.56 | 40.60 | a | 53.18 | 61.60 | 62.74 | 59.55 | 57.50 | 46.39 | 25.85 | 16.05 | a | 40.98 | ||||||||||
1957 | 16.42 | 26.68 | 28.67 | a | 36.74 | a | 46.27 | 56.19 | a | 63.16 | 62.39 | 53.08 | 46.03 | 26.50 | 22.03 | 40.35 | ||||||||||
1958 | 13.69 | 28.20 | 27.31 | 36.78 | 52.19 | 60.50 | 62.40 | 63.26 | 56.63 | 45.52 | 32.73 | 25.94 | 42.10 | |||||||||||||
1959 | 20.76 | 22.34 | 27.15 | 38.37 | 48.95 | 60.40 | 62.29 | 61.69 | 52.52 | 42.67 | a | 31.36 | a | 22.39 | 40.91 | |||||||||||
1960 | 22.02 | a | 18.09 | 32.35 | 42.10 | 48.58 | 59.24 | a | 62.98 | 62.63 | 56.58 | 44.48 | 32.95 | 19.60 | 41.80 | |||||||||||
1961 | 16.00 | 25.16 | 31.52 | 37.97 | 49.76 | 58.58 | 62.85 | 63.23 | 48.72 | a | 43.93 | a | 28.38 | 19.21 | 40.44 | |||||||||||
1962 | 6.56 | 23.75 | f | 23.37 | 43.02 | 48.76 | 55.83 | 60.63 | 61.07 | a | 55.55 | 47.61 | 36.62 | 23.27 | 42.03 | a | ||||||||||
1963 | 13.74 | 27.50 | 28.65 | 42.97 | 53.38 | a | 57.67 | d | 66.36 | b | 63.15 | d | 59.42 | 51.50 | 34.33 | 20.68 | 43.28 | |||||||||
1964 | 12.94 | 12.78 | 20.90 | 37.83 | 49.98 | 56.40 | 65.87 | 59.63 | a | 54.05 | 45.05 | a | 30.68 | 19.65 | 38.81 | |||||||||||
1965 | 19.87 | 18.96 | 19.02 | 39.20 | 47.39 | 55.55 | 61.50 | 58.50 | 50.10 | 46.53 | 35.05 | 21.85 | 39.46 | |||||||||||||
1966 | 16.65 | 18.21 | 32.11 | 40.32 | 50.13 | 56.38 | 65.37 | 61.03 | a | 55.27 | 42.32 | 35.82 | 11.40 | 40.42 | ||||||||||||
1967 | 20.31 | 18.46 | 34.92 | 41.32 | 46.44 | 53.68 | 62.82 | 60.02 | 55.10 | a | 45.47 | 32.42 | 17.45 | a | 40.70 | |||||||||||
1968 | 14.24 | 20.93 | 26.63 | 35.05 | 46.40 | 57.83 | 62.16 | 58.74 | 51.93 | 45.18 | 24.48 | 20.63 | 38.68 | |||||||||||||
1969 | 26.23 | a | 18.16 | 21.81 | 42.50 | 51.94 | 53.38 | 64.89 | 64.58 | 55.77 | 38.13 | 27.41 | a | 21.85 | 40.55 | |||||||||||
1970 | 20.10 | 24.05 | 27.10 | 33.92 | 49.29 | 56.28 | 62.77 | 63.10 | 52.12 | 37.29 | 32.52 | 21.95 | 40.04 | |||||||||||||
1971 | 24.81 | 22.62 | 28.34 | 39.83 | 46.85 | 57.48 | 62.32 | 62.65 | 50.76 | a | 43.81 | 29.17 | 17.37 | 40.50 | ||||||||||||
1972 | 19.63 | 25.64 | a | 36.42 | 41.65 | 48.50 | 58.33 | 61.89 | 59.92 | 52.97 | 44.53 | 25.67 | 14.97 | 40.84 | ||||||||||||
1973 | 9.92 | a | 12.84 | 25.40 | 33.12 | 46.50 | 55.40 | 58.69 | 60.37 | 52.57 | a | 45.13 | 32.78 | 20.76 | 37.79 | |||||||||||
1974 | 14.65 | 14.00 | 33.76 | 36.95 | 50.53 | 56.83 | 61.32 | 58.90 | 51.87 | 45.21 | 30.72 | 15.85 | 39.22 | |||||||||||||
1975 | 19.58 | 17.70 | 30.18 | a | 34.85 | 46.56 | 53.63 | 61.63 | 58.94 | 52.37 | 43.71 | 28.05 | 23.81 | 39.25 | ||||||||||||
1976 | 17.31 | 25.16 | a | 25.13 | 39.74 | a | 47.27 | 54.00 | 62.61 | 59.26 | 52.62 | 40.29 | 29.43 | 19.52 | 39.36 | |||||||||||
1977 | 19.08 | 23.84 | 26.90 | 41.52 | 48.53 | 61.10 | 63.76 | 61.52 | 56.05 | 44.27 | 33.60 | 27.15 | 42.28 | |||||||||||||
1978 | 20.95 | 22.45 | 32.68 | 41.77 | 46.87 | 57.62 | 63.27 | 59.31 | 54.40 | 44.87 | 33.13 | 15.60 | 41.08 | |||||||||||||
1979 | 10.27 | 20.93 | 27.95 | 39.63 | 48.00 | 56.47 | 63.02 | a | 60.61 | 56.20 | 46.48 | 22.28 | 14.77 | 38.89 | ||||||||||||
1980 | 20.89 | 20.66 | 24.60 | 33.47 | 45.25 | o | 57.66 | b | 58.95 | 58.40 | a | 53.68 | 42.10 | 31.12 | 29.90 | 39.22 | a | |||||||||
1981 | 23.47 | a | 25.66 | 29.00 | 44.85 | 49.27 | 60.22 | a | 61.84 | 60.18 | 55.32 | b | 43.76 | 37.53 | 26.26 | 43.11 | ||||||||||
1982 | 20.34 | f | 18.12 | 32.52 | 35.84 | a | 46.58 | 53.55 | 61.27 | 62.18 | 52.40 | 38.63 | 25.83 | 17.10 | 40.37 | a | ||||||||||
1983 | 17.60 | a | 21.62 | 27.74 | 33.43 | 43.50 | 53.80 | 60.50 | 62.66 | 52.50 | 43.11 | 30.83 | 22.00 | g | 40.66 | a | ||||||||||
1984 | 4.74 | 11.41 | 25.09 | b | 31.85 | 48.42 | 53.08 | 59.90 | 59.05 | 52.90 | 35.28 | b | 28.77 | 20.48 | 35.91 | |||||||||||
1985 | 13.05 | c | 15.42 | b | 28.50 | 40.65 | 48.13 | 58.23 | 61.73 | 60.18 | ----- | z | 40.37 | 25.83 | a | 17.84 | 37.27 | a | ||||||||
1986 | 16.53 | b | 25.68 | 33.90 | 38.72 | 47.34 | 59.33 | ----- | z | ----- | z | 50.07 | a | 38.39 | 26.42 | 19.50 | 35.59 | b | ||||||||
1987 | 17.68 | 24.32 | 28.50 | 41.35 | 49.77 | e | 58.76 | a | 61.52 | 59.98 | 50.00 | 42.53 | 27.28 | c | ----- | z | 41.97 | a | ||||||||
1988 | 9.39 | 14.43 | 21.10 | 36.97 | 45.27 | 57.70 | 62.71 | 61.74 | 50.28 | 43.65 | 27.92 | 12.23 | 36.95 | |||||||||||||
1989 | 8.29 | b | 14.16 | 30.31 | b | 39.93 | 47.11 | 52.70 | 59.56 | 55.89 | 50.82 | 38.87 | 27.78 | 15.03 | a | 36.71 | ||||||||||
1990 | 17.17 | b | 19.79 | 29.79 | 38.18 | 43.56 | 57.43 | 57.21 | 55.89 | 51.87 | 38.82 | 32.42 | 16.90 | b | 38.25 | |||||||||||
1991 | 15.55 | a | 24.25 | 32.95 | 39.47 | 51.64 | b | 58.73 | 62.79 | 58.68 | 50.55 | 42.00 | 29.93 | c | 18.77 | 40.44 | ||||||||||
1992 | 14.56 | 24.14 | 33.32 | c | 45.78 | e | 50.71 | b | 54.70 | c | 59.09 | d | 59.35 | e | 52.90 | e | 46.52 | e | 24.74 | c | 18.82 | i | 42.35 | a | ||
1993 | 17.85 | h | 16.83 | e | 25.76 | f | 34.36 | b | 44.52 | e | 49.41 | c | 55.02 | c | 53.33 | e | 46.30 | e | 34.66 | f | 18.88 | f | 13.88 | f | 42.82 | e |
1994 | 15.73 | e | 14.48 | f | 26.50 | e | 36.69 | c | 51.20 | c | 59.66 | a | 62.84 | 62.48 | 54.55 | b | 43.55 | 26.22 | c | 20.52 | a | 41.81 | a | |||
1995 | 12.78 | d | ----- | z | 28.21 | 34.34 | b | 41.98 | e | 52.00 | b | 58.78 | o | 61.47 | l | 54.21 | b | 40.07 | b | 35.40 | d | 21.23 | c | 35.58 | c | |
1996 | 16.90 | e | 18.09 | 26.39 | c | 37.41 | c | 49.95 | b | 57.05 | a | 61.77 | c | 60.63 | a | 50.44 | d | 40.59 | b | 28.25 | f | 19.63 | e | 39.90 | a | |
1997 | 12.38 | e | 17.56 | d | 29.97 | 33.79 | a | 45.55 | c | 56.70 | c | 60.05 | c | 60.06 | d | 54.19 | c | 40.82 | c | 28.98 | d | 16.86 | b | 38.08 | ||
1998 | 19.66 | 21.23 | 26.98 | b | 34.82 | b | 48.31 | b | 51.88 | 63.23 | 60.35 | ----- | z | 39.69 | d | 30.26 | e | 17.20 | d | 37.60 | a | |||||
1999 | 21.06 | d | 23.56 | c | 32.13 | d | 33.71 | f | 45.10 | f | 54.75 | 59.45 | b | 57.62 | e | 47.71 | f | 40.45 | a | 33.54 | e | 17.63 | e | 37.80 | c | |
2000 | 20.70 | d | 24.29 | e | 30.43 | d | 41.82 | b | 51.64 | i | 55.91 | c | 62.38 | a | 61.05 | b | 53.14 | a | 41.57 | d | 18.86 | e | 17.21 | e | 38.85 | a |
2001 | 10.92 | f | 22.16 | f | 30.60 | e | 38.98 | g | 47.22 | d | 56.25 | b | 61.80 | h | 59.37 | d | 51.46 | c | 41.30 | f | 30.62 | d | 17.79 | e | 41.90 | e |
2002 | 15.54 | g | 14.12 | h | 25.13 | e | 40.96 | f | 46.95 | j | 59.50 | c | 64.38 | f | 60.33 | d | 51.19 | f | 38.45 | c | 21.90 | e | 17.30 | f | 41.06 | g |
2003 | 22.68 | f | 20.72 | e | 24.89 | i | 35.75 | d | 45.30 | d | 52.29 | a | 64.00 | c | 59.93 | d | 47.69 | i | 43.42 | f | 26.80 | c | 20.02 | c | 40.60 | d |
2004 | 13.08 | f | 15.70 | b | 31.55 | c | 38.60 | 46.80 | a | 54.02 | b | 58.58 | 56.80 | f | 51.17 | d | 42.07 | a | 28.28 | a | 12.57 | c | 37.93 | b | ||
2005 | 18.56 | d | 16.27 | d | 26.29 | b | 37.41 | b | 46.93 | b | 51.70 | h | 62.56 | f | 57.64 | c | 51.17 | 39.98 | 25.75 | 11.87 | e | 33.19 | b | |||
2006 | 12.95 | 12.09 | 24.00 | 37.36 | a | 45.28 | a | 54.91 | a | 59.70 | a | 55.03 | a | 41.71 | b | 33.00 | a | 24.19 | a | 11.65 | 34.32 | |||||
2007 | 4.57 | d | 20.11 | 27.27 | a | 33.42 | 41.68 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.60 | a | 15.05 | c | 24.81 | e | ||
2008 | 8.71 | b | 17.24 | 22.81 | 31.97 | 45.26 | 57.58 | 64.90 | 61.71 | g | 53.45 | b | 46.06 | o | 32.34 | b | 23.00 | k | 37.14 | c | ||||||
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2020 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.52 | 20.27 | 28.17 | 38.40 | 47.85 | 56.19 | 61.78 | 60.07 | 53.08 | 42.82 | 29.45 | 19.53 | 39.77 | |||||||||||||
S.D. | 5.26 | 4.63 | 3.80 | 3.44 | 2.48 | 2.66 | 2.19 | 2.09 | 2.75 | 3.17 | 3.95 | 4.11 | 1.90 | |||||||||||||
SKEW | -0.13 | -0.06 | -0.28 | 0.19 | -0.06 | -0.14 | -0.16 | -0.60 | -1.05 | -0.44 | -0.16 | 0.18 | -0.25 | |||||||||||||
MAX | 28.58 | 31.54 | 36.42 | 46.27 | 53.38 | 61.60 | 67.66 | 64.58 | 59.42 | 51.50 | 37.53 | 29.90 | 44.53 | |||||||||||||
MIN | 4.57 | 10.86 | 19.02 | 31.85 | 41.68 | 49.41 | 55.02 | 53.33 | 41.71 | 33.00 | 18.86 | 11.40 | 34.32 | |||||||||||||
YRS | 63 | 64 | 67 | 66 | 65 | 67 | 64 | 65 | 64 | 65 | 68 | 64 | 47 |