YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1943 | ----- | z | ----- | z | ----- | z | ----- | z | 30.05 | i | 36.30 | 40.42 | 36.87 | a | 28.54 | b | 20.83 | b | 14.77 | 2.32 | 25.72 | e | ||||
1944 | -5.20 | a | 4.68 | a | 3.77 | a | 21.07 | a | 26.19 | 36.55 | a | 38.81 | 36.90 | 29.36 | b | 27.17 | m | 10.37 | 2.06 | 18.60 | a | |||||
1945 | 12.10 | 11.61 | 15.62 | b | 18.52 | a | 29.45 | 35.27 | 36.90 | 34.90 | 28.23 | 22.45 | 12.11 | c | 2.97 | 21.68 | ||||||||||
1946 | 1.11 | c | -4.85 | o | 15.74 | 16.30 | 28.90 | a | 33.96 | b | 39.10 | 34.79 | l | 32.83 | 24.83 | a | 16.90 | 12.16 | 22.18 | b | ||||||
1947 | 3.61 | 11.25 | 18.21 | b | 24.47 | 31.81 | 34.43 | 38.00 | 35.74 | 33.60 | 30.35 | 15.70 | 12.97 | 24.18 | ||||||||||||
1948 | 4.10 | 7.72 | 10.20 | a | 22.92 | d | ----- | z | 41.30 | 35.38 | r | 35.19 | ----- | z | ----- | z | ----- | z | ----- | z | 20.24 | f | ||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | 15.39 | 20.13 | 28.90 | 34.10 | 37.16 | 32.29 | 28.93 | 22.35 | 21.35 | d | 5.03 | a | 24.56 | b | ||||||||
1996 | 9.45 | b | 5.83 | 8.60 | a | 21.70 | 26.29 | 33.55 | a | 37.45 | 32.71 | ----- | z | 16.60 | a | 11.04 | b | 12.57 | c | 19.62 | a | |||||
1997 | 5.72 | b | 1.46 | 14.74 | 15.67 | c | 26.77 | a | 38.23 | 39.81 | 37.58 | 31.03 | 20.77 | 11.57 | 2.63 | a | 20.50 | |||||||||
1998 | 7.13 | a | 3.61 | 12.93 | a | 20.83 | 23.94 | 33.17 | 39.81 | 35.84 | 31.90 | 20.58 | 16.52 | a | 7.69 | b | 21.16 | |||||||||
1999 | 14.93 | a | 8.00 | 7.48 | 17.17 | 23.52 | 31.23 | 31.90 | 37.00 | 26.60 | 23.74 | 15.70 | 5.45 | 20.23 | ||||||||||||
2000 | 4.84 | 10.24 | 13.65 | 20.60 | 29.94 | 34.40 | 39.65 | 32.10 | 29.00 | 21.39 | 2.43 | 4.83 | b | 20.25 | ||||||||||||
2001 | 2.30 | a | -0.50 | 13.58 | 21.93 | 23.87 | 33.70 | 39.58 | 34.55 | 28.40 | 21.32 | 14.63 | -1.00 | b | 19.36 | |||||||||||
2002 | 9.34 | b | 1.33 | a | 9.23 | 18.77 | 25.16 | 35.27 | 39.81 | 33.03 | 27.40 | 13.32 | 15.79 | a | 15.41 | b | 20.32 | |||||||||
2003 | 14.77 | a | 6.41 | a | 18.84 | 23.55 | a | 27.03 | 33.67 | 38.45 | 38.52 | 27.60 | 23.10 | a | 7.45 | a | 7.00 | 22.20 | ||||||||
2004 | 2.45 | 2.55 | 19.00 | 23.40 | 30.48 | 35.93 | 38.74 | 36.74 | 28.83 | 21.81 | 13.30 | 13.77 | a | 22.25 | ||||||||||||
2005 | 9.93 | b | ----- | z | 17.16 | 21.63 | 28.90 | 34.17 | 35.55 | 35.90 | 28.50 | 25.26 | 10.93 | a | 0.50 | a | 22.59 | a | ||||||||
2006 | 11.53 | a | 1.81 | a | 11.35 | 24.30 | 27.81 | 37.57 | 40.58 | 33.23 | 30.50 | 21.93 | b | 16.43 | 3.55 | 21.72 | ||||||||||
2007 | 1.89 | d | 16.31 | b | 17.55 | 24.47 | 27.30 | a | 38.03 | 44.06 | 37.32 | 30.85 | q | 22.68 | i | 14.76 | a | 6.07 | d | 22.78 | b | |||||
2008 | -0.06 | 10.10 | 8.77 | 11.07 | 30.10 | a | 32.57 | 37.03 | 35.81 | 25.41 | a | ----- | z | 19.93 | 8.06 | 19.89 | a | |||||||||
2009 | 9.26 | 10.18 | 12.97 | 21.67 | 27.16 | 36.50 | 38.13 | 37.94 | 29.31 | a | 22.61 | 14.63 | 1.23 | a | 21.80 | |||||||||||
2010 | 7.17 | a | 6.36 | 15.77 | 20.67 | 25.80 | a | 35.57 | 36.81 | 35.80 | a | 28.67 | 23.97 | 13.03 | a | 0.96 | c | 20.88 | ||||||||
2011 | 8.10 | a | 3.59 | a | 15.45 | 20.43 | 26.50 | a | 34.60 | 37.68 | 35.45 | 29.13 | 23.10 | 10.77 | 7.13 | a | 20.99 | |||||||||
2012 | 7.39 | 18.50 | a | ----- | z | 25.00 | 25.10 | a | 30.83 | 40.34 | b | 33.77 | 25.50 | 23.84 | 16.10 | 4.74 | 22.83 | a | ||||||||
2013 | 1.19 | 10.79 | 16.45 | 18.93 | 28.65 | 36.47 | 39.10 | 35.87 | 37.43 | 19.19 | 14.81 | d | 6.71 | 22.13 | ||||||||||||
2014 | 14.39 | 6.04 | 16.10 | 23.87 | 29.31 | b | ----- | z | 39.67 | a | 40.79 | b | 27.10 | 24.65 | 9.13 | 10.81 | 21.99 | a | ||||||||
2015 | 12.90 | 17.00 | 15.87 | 18.20 | 26.47 | a | 36.63 | 37.10 | a | 33.30 | a | 31.30 | 26.50 | e | 10.23 | 8.16 | 22.81 | |||||||||
2016 | 7.23 | 16.34 | 20.32 | 25.33 | 28.21 | b | 32.57 | b | 36.13 | 34.03 | 33.23 | 28.53 | a | 20.14 | a | 1.81 | 23.66 | |||||||||
2017 | -5.74 | 9.84 | c | 22.23 | a | 24.43 | 28.13 | 35.50 | 38.48 | 34.33 | a | 30.28 | a | 20.19 | ----- | z | 6.90 | 22.23 | a | |||||||
2018 | ----- | z | 9.54 | 9.39 | 23.50 | d | 33.48 | 37.43 | ----- | z | 37.60 | a | 28.93 | 25.19 | 13.77 | 5.84 | 22.47 | b | ||||||||
2019 | 2.59 | b | -0.29 | 2.48 | 24.20 | 29.48 | 34.97 | a | ----- | z | 37.97 | 36.90 | 14.16 | 14.13 | 9.33 | a | 18.72 | a | ||||||||
2020 | 10.03 | 7.89 | b | 16.16 | 21.40 | 31.45 | 34.87 | ----- | z | ----- | z | ----- | z | 23.48 | 12.59 | a | 11.16 | 18.78 | c | |||||||
2021 | 9.48 | 5.96 | ----- | z | 21.30 | ----- | z | 35.60 | 42.97 | 38.13 | 27.73 | 25.42 | 21.80 | 14.37 | a | 24.28 | b | |||||||||
2022 | 7.10 | 11.14 | 18.48 | 18.87 | ----- | z | 36.70 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.46 | g | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 6.48 | 7.84 | 13.98 | 21.10 | 27.87 | 35.20 | 38.59 | 35.72 | 29.73 | 22.47 | 13.96 | 6.66 | 21.54 | |||||||||||||
S.D. | 5.28 | 5.10 | 4.66 | 3.15 | 2.41 | 2.11 | 2.26 | 2.07 | 2.90 | 3.65 | 4.06 | 4.46 | 1.27 | |||||||||||||
SKEW | -0.44 | 0.31 | -0.69 | -1.06 | 0.16 | 0.37 | -0.28 | 0.12 | 1.08 | -0.54 | -0.36 | 0.30 | 0.40 | |||||||||||||
MAX | 14.93 | 18.50 | 22.23 | 25.33 | 33.48 | 41.30 | 44.06 | 40.79 | 37.43 | 30.35 | 21.80 | 15.41 | 24.18 | |||||||||||||
MIN | -5.74 | -0.50 | 2.48 | 11.07 | 23.52 | 30.83 | 31.90 | 32.10 | 25.41 | 13.32 | 2.43 | -1.00 | 19.36 | |||||||||||||
YRS | 31 | 30 | 31 | 33 | 30 | 33 | 29 | 31 | 29 | 29 | 31 | 32 | 17 |