YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.67 | d | 18.67 | k |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 46.15 | c | 32.92 | g | 26.22 | c | 16.50 | a | 29.62 | i |
1988 | 9.81 | 18.31 | 23.47 | a | 31.41 | a | 44.83 | a | 56.67 | 57.23 | a | 57.46 | g | 45.97 | 35.59 | d | 24.53 | 16.87 | 33.15 | a | ||||||
1989 | 16.19 | 8.93 | 28.40 | k | 32.60 | y | 43.26 | 49.29 | b | 57.97 | 56.58 | 45.57 | b | 34.48 | 23.53 | 10.67 | a | 34.65 | b | |||||||
1990 | 15.71 | c | 15.33 | d | 25.10 | a | 34.57 | 41.56 | m | 57.20 | t | 58.95 | k | 56.90 | a | 52.07 | a | 36.30 | a | 27.40 | 12.18 | i | 32.92 | d | ||
1991 | 12.50 | a | 22.64 | 25.47 | a | 34.37 | 47.03 | a | 57.07 | a | 59.03 | b | 57.18 | c | 48.87 | 33.87 | 22.13 | 20.47 | a | 36.72 | ||||||
1992 | 18.10 | a | 26.39 | a | 29.27 | a | 33.53 | o | 44.30 | h | 51.44 | c | 56.03 | b | 55.29 | 45.96 | c | 35.00 | d | 21.32 | b | 11.93 | a | 35.07 | b | |
1993 | 11.48 | 14.32 | 26.87 | a | 33.00 | a | 43.48 | b | 50.33 | c | 58.35 | 55.77 | i | 44.82 | b | 31.38 | r | 20.54 | b | 20.96 | f | 33.69 | c | |||
1994 | 17.35 | h | 5.57 | u | ----- | z | ----- | z | ----- | z | ----- | z | 57.13 | h | ----- | z | 49.67 | f | 38.40 | a | 26.23 | 22.78 | d | 29.14 | i | |
1995 | 19.36 | c | 25.14 | f | 25.97 | b | 30.77 | 41.32 | 53.54 | f | 59.00 | 58.62 | g | 49.83 | 34.50 | c | 27.68 | b | 19.43 | j | 36.05 | d | ||||
1996 | 10.41 | d | 17.39 | a | 19.73 | e | 32.03 | 45.16 | 55.27 | 59.27 | a | 56.68 | l | 49.34 | a | 36.50 | a | 22.07 | a | 17.33 | d | 33.14 | a | |||
1997 | 14.07 | a | 18.08 | b | 27.04 | e | 29.17 | 43.45 | 54.80 | 57.73 | a | 59.17 | a | 51.64 | b | 35.69 | b | 23.43 | 19.45 | 36.14 | ||||||
1998 | 19.28 | b | 24.96 | 22.77 | a | 31.30 | 46.74 | 50.82 | h | 62.32 | c | 59.00 | 53.30 | 36.86 | c | 28.12 | e | 15.97 | 36.42 | a | ||||||
1999 | 17.66 | b | 21.00 | a | 26.16 | 32.76 | a | 43.97 | b | 54.95 | k | 62.48 | b | 59.31 | e | 46.10 | 36.36 | c | 28.97 | 19.91 | h | 37.48 | b | |||
2000 | 19.10 | 23.58 | e | 28.68 | 30.27 | 43.90 | 47.77 | h | 60.50 | a | 60.29 | 48.21 | f | 37.79 | b | 19.17 | 12.07 | d | 33.54 | b | ||||||
2001 | 17.04 | c | 18.04 | 27.00 | 35.00 | 45.32 | c | 55.37 | 63.35 | e | 58.97 | 51.23 | d | 35.04 | e | 26.68 | b | 19.11 | c | 37.68 | ||||||
2002 | 15.77 | 15.92 | d | 17.43 | a | 34.60 | 40.50 | g | 57.93 | b | 62.07 | a | 58.07 | c | 50.85 | c | 32.19 | 27.71 | i | 19.94 | 36.48 | b | ||||
2003 | 18.71 | c | 15.64 | 27.25 | c | 37.52 | a | 45.45 | 52.93 | 62.04 | c | 60.19 | 46.39 | g | 38.92 | e | 24.41 | a | 17.93 | a | 36.46 | a | ||||
2004 | 16.54 | c | 16.96 | b | 29.63 | d | 32.75 | b | 44.54 | e | 51.83 | 58.96 | h | 54.97 | b | 51.10 | 38.34 | b | 26.37 | 20.79 | b | 34.89 | a | |||
2005 | 19.74 | d | 21.71 | 25.58 | 34.27 | 43.29 | 55.50 | b | 61.27 | a | 58.34 | b | 50.87 | 37.90 | 28.96 | e | 17.88 | e | 37.94 | |||||||
2006 | 22.70 | d | 15.20 | c | 23.92 | e | 35.28 | a | 45.48 | 56.00 | d | 63.04 | g | 58.56 | d | 43.32 | b | 35.87 | 23.21 | f | 16.91 | i | 37.37 | c | ||
2007 | 7.96 | c | 12.19 | b | 30.48 | d | 32.37 | 45.32 | c | 53.68 | b | 61.29 | c | 61.65 | e | 50.24 | a | 37.97 | 22.77 | 10.59 | b | 35.54 | ||||
2008 | 11.20 | a | 18.65 | c | 24.96 | c | 31.18 | h | 40.85 | d | 54.29 | m | 59.56 | d | 58.92 | e | 47.59 | a | 35.93 | b | 26.85 | c | 11.28 | b | 33.58 | b |
2009 | 17.61 | 21.31 | b | 22.58 | 31.24 | a | 45.30 | d | 53.50 | 58.47 | a | 54.10 | 48.30 | c | 30.16 | 28.45 | a | 10.13 | h | 37.36 | a | |||||
2010 | 15.52 | 14.33 | d | 26.54 | c | 34.61 | b | 41.33 | d | 57.24 | m | 60.18 | i | 60.36 | f | 49.61 | b | 38.26 | d | 23.83 | 18.38 | g | 30.50 | d | ||
2011 | 13.68 | c | 12.43 | 26.00 | b | 34.59 | c | 41.19 | e | 55.40 | j | 62.46 | c | 60.73 | a | 47.37 | k | 36.21 | c | 22.67 | 16.07 | c | 32.60 | b | ||
2012 | 16.58 | 16.88 | c | 31.03 | a | 38.45 | a | 43.35 | 59.44 | l | 62.83 | h | 55.78 | m | 49.17 | a | 33.68 | f | 25.57 | b | 14.42 | 29.43 | d | |||
2013 | 13.47 | a | 15.00 | b | 19.84 | 27.08 | d | 45.73 | e | 53.48 | e | 59.66 | b | 60.03 | 54.43 | b | 36.07 | b | 24.19 | c | 12.27 | a | 35.10 | |||
2014 | 15.39 | 11.88 | b | 23.48 | 33.70 | 41.14 | b | 52.50 | 60.12 | e | 58.00 | b | 49.88 | e | 39.31 | e | 20.17 | 17.00 | d | 35.21 | ||||||
2015 | 17.17 | a | 19.61 | 28.97 | a | 36.11 | b | 42.94 | 58.27 | 59.29 | c | 58.48 | 53.62 | a | 41.28 | f | 26.96 | e | 19.19 | 38.24 | a | |||||
2016 | 18.19 | 22.83 | 29.33 | d | 34.50 | 42.48 | b | 57.07 | b | 61.06 | 56.93 | d | 50.88 | f | 39.90 | b | 30.59 | c | 11.84 | 36.79 | a | |||||
2017 | 15.52 | 23.70 | a | 28.94 | 37.04 | f | 42.79 | b | 54.93 | 61.58 | 55.83 | b | 49.31 | d | 35.87 | 26.26 | c | 16.29 | 37.37 | a | ||||||
2018 | 14.23 | 12.75 | 25.03 | b | 28.50 | 48.74 | 56.29 | b | 61.10 | 55.73 | a | 51.19 | d | 33.79 | b | 22.79 | b | 18.16 | 35.69 | |||||||
2019 | 15.90 | 10.29 | 21.29 | 33.87 | 40.26 | 52.43 | 61.39 | 58.03 | 54.40 | 29.55 | 21.33 | 21.87 | 35.05 | |||||||||||||
2020 | 18.87 | 16.21 | 28.52 | 30.67 | 43.19 | d | 57.48 | a | 61.29 | 59.77 | a | 47.50 | 31.71 | 27.52 | a | 19.13 | 36.82 | |||||||||
2021 | 17.77 | 11.64 | 26.47 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 14.71 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.86 | 17.32 | 25.75 | 33.03 | 43.86 | 54.52 | 60.22 | 58.12 | 49.39 | 35.81 | 24.93 | 16.66 | 36.19 | |||||||||||||
S.D. | 3.24 | 4.50 | 3.31 | 2.61 | 2.03 | 2.48 | 1.85 | 1.91 | 2.91 | 2.54 | 2.92 | 3.53 | 1.06 | |||||||||||||
SKEW | -0.50 | 0.19 | -0.61 | -0.21 | 0.22 | -0.36 | -0.37 | -0.32 | -0.14 | -0.74 | -0.12 | -0.33 | 0.49 | |||||||||||||
MAX | 22.70 | 26.39 | 31.03 | 38.45 | 48.74 | 58.27 | 63.35 | 61.65 | 54.43 | 39.90 | 30.59 | 22.78 | 37.94 | |||||||||||||
MIN | 7.96 | 8.93 | 17.43 | 27.08 | 40.26 | 49.29 | 56.03 | 54.10 | 43.32 | 29.55 | 19.17 | 10.59 | 35.05 | |||||||||||||
YRS | 33 | 32 | 31 | 28 | 29 | 23 | 27 | 26 | 29 | 30 | 32 | 28 | 10 |