YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | 23.00 | 25.48 | 28.37 | c | 37.58 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.45 | a | 20.10 | a | 24.08 | g | ||
1948 | 15.80 | a | 18.71 | a | 16.21 | g | 26.75 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.26 | j |
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 | 18.67 | ----- | z | 18.67 | k | |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | 23.47 | n | 23.06 | k | 26.11 | l | 31.71 | m | 38.74 | h | 48.38 | i | 51.76 | j | 51.29 | n | 45.20 | 36.74 | 21.96 | b | 20.87 | a | 31.19 | h | ||
2001 | 17.88 | f | 20.58 | b | 24.70 | a | 32.83 | a | 38.87 | 45.86 | a | 52.87 | 50.26 | 44.47 | 36.57 | j | 26.11 | c | 15.52 | f | 37.39 | c | ||||
2002 | 20.00 | b | 19.75 | d | 23.35 | 34.39 | b | 36.29 | 46.08 | f | 54.16 | 50.30 | a | 45.53 | 34.58 | 26.47 | 17.40 | a | 32.93 | a | ||||||
2003 | 24.60 | a | 22.44 | a | 23.81 | 30.83 | 39.52 | 44.79 | a | 52.97 | a | 52.55 | 44.93 | 37.94 | 28.39 | b | 19.15 | e | 35.16 | |||||||
2004 | 21.13 | a | 18.46 | c | 31.06 | 33.69 | a | 40.32 | 44.60 | 48.90 | 50.35 | 43.52 | a | 36.00 | 26.67 | 22.00 | 34.73 | |||||||||
2005 | 25.90 | a | 27.64 | c | 26.17 | a | 32.20 | 38.81 | 46.82 | b | 51.81 | 50.68 | 48.80 | 36.23 | a | 27.30 | 20.83 | a | 36.10 | |||||||
2006 | 18.62 | b | 22.32 | 27.43 | c | 32.83 | 38.71 | 46.97 | 54.16 | 52.80 | a | 42.40 | 35.26 | 27.15 | c | 19.29 | 34.83 | |||||||||
2007 | 16.14 | b | 20.96 | a | 27.68 | 32.37 | 38.84 | 45.17 | 52.81 | 55.48 | 48.00 | 36.95 | i | 28.50 | 19.71 | 35.06 | a | |||||||||
2008 | 20.61 | 25.15 | b | 28.84 | 32.90 | 37.53 | a | 47.40 | 54.65 | 53.45 | 46.10 | 35.42 | 30.63 | 25.90 | a | 36.55 | ||||||||||
2009 | 25.65 | 25.89 | a | 30.12 | o | 31.62 | a | 41.06 | 46.13 | 53.71 | 50.19 | 45.83 | 35.32 | 29.13 | 19.10 | 36.69 | a | |||||||||
2010 | 23.61 | 24.71 | 27.90 | 33.62 | a | 38.32 | 46.63 | 55.77 | 56.35 | 48.73 | 38.61 | 25.70 | 29.39 | 37.45 | ||||||||||||
2011 | 20.32 | 21.15 | b | 31.93 | a | 36.23 | 37.23 | 46.30 | 54.58 | 56.13 | 48.50 | 37.48 | 29.83 | 20.10 | 36.65 | |||||||||||
2012 | 24.55 | 25.62 | 27.87 | 33.80 | 39.52 | 46.90 | 53.81 | 53.71 | 45.70 | 34.81 | 26.07 | 17.00 | 35.78 | |||||||||||||
2013 | 12.39 | 16.96 | 28.35 | 31.73 | 38.42 | 47.73 | 54.39 | 52.42 | 46.80 | 31.81 | 28.23 | 20.29 | 34.13 | |||||||||||||
2014 | 19.87 | 23.18 | 26.77 | 30.73 | 38.00 | 47.17 | 53.71 | 49.77 | 48.80 | 37.42 | 27.23 | 23.19 | 35.49 | |||||||||||||
2015 | 21.81 | 26.36 | 29.03 | 32.10 | 36.94 | 49.57 | 52.94 | 52.71 | 48.57 | 39.74 | 25.20 | 15.94 | 35.91 | |||||||||||||
2016 | 16.10 | 21.41 | 27.68 | 31.30 | 37.90 | 49.50 | 52.87 | 50.45 | 46.47 | 39.13 | 27.97 | 22.52 | 35.27 | |||||||||||||
2017 | 22.52 | 26.28 | c | 29.13 | 31.97 | 38.90 | 48.57 | 54.32 | 51.06 | 46.33 | 38.16 | 32.90 | 21.42 | 36.80 | ||||||||||||
2018 | 19.58 | 22.07 | 26.55 | 35.20 | 38.94 | 49.20 | 52.94 | 51.90 | 46.03 | 36.71 | 22.93 | 20.13 | 35.18 | |||||||||||||
2019 | 18.74 | 18.96 | 28.32 | 33.30 | 35.39 | 44.87 | 52.81 | 52.71 | 48.36 | b | 33.29 | 26.77 | 20.10 | 34.47 | ||||||||||||
2020 | 20.85 | e | 21.79 | a | 29.87 | 33.54 | b | 42.26 | 54.60 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.66 | g | ||
2021 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.44 | 22.43 | 27.60 | 32.65 | 38.59 | 46.90 | 53.38 | 52.28 | 46.45 | 36.37 | 26.69 | 20.72 | 35.63 | |||||||||||||
S.D. | 3.55 | 2.93 | 2.20 | 1.69 | 1.57 | 1.57 | 1.43 | 2.05 | 1.86 | 2.05 | 3.06 | 3.00 | 0.95 | |||||||||||||
SKEW | -0.37 | 0.03 | -0.13 | -0.25 | 0.25 | 0.27 | -1.45 | 0.68 | -0.34 | -0.38 | -0.60 | 1.20 | 0.26 | |||||||||||||
MAX | 25.90 | 27.64 | 31.93 | 36.23 | 42.26 | 49.57 | 55.77 | 56.35 | 48.80 | 39.74 | 32.90 | 29.39 | 37.45 | |||||||||||||
MIN | 12.39 | 16.96 | 23.35 | 28.37 | 35.39 | 44.60 | 48.90 | 49.77 | 42.40 | 31.81 | 18.67 | 15.94 | 34.13 | |||||||||||||
YRS | 20 | 22 | 20 | 21 | 20 | 18 | 19 | 19 | 20 | 18 | 22 | 20 | 15 |