YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 47.62 | n | 31.38 | 9.82 | 20.60 | j | ||
1959 | 4.47 | b | 12.34 | 29.24 | 42.45 | 55.85 | 65.68 | 69.52 | 68.79 | g | 57.64 | a | 40.72 | a | 20.50 | 23.95 | 38.40 | a | ||||||||
1960 | 10.05 | 13.07 | 18.24 | 41.40 | 53.89 | 61.40 | 69.19 | g | 68.98 | e | 58.27 | 46.68 | 30.90 | 12.76 | 37.78 | a | ||||||||||
1961 | 7.56 | 22.04 | 33.45 | 36.17 | 51.10 | 65.30 | 67.39 | 69.90 | a | 56.63 | 47.19 | 28.82 | 12.74 | 41.52 | ||||||||||||
1962 | 4.02 | b | 9.88 | 27.13 | 38.75 | 55.39 | 62.55 | 65.16 | 65.16 | l | 52.65 | g | 47.55 | a | 32.41 | a | 15.52 | a | 35.84 | b | ||||||
1963 | 5.39 | h | 9.82 | 31.52 | a | 42.92 | 52.79 | 66.55 | a | 69.00 | k | 66.02 | 59.22 | 55.53 | 34.52 | 7.37 | 42.62 | b | ||||||||
1964 | 16.11 | 17.76 | 22.08 | 42.80 | 57.34 | 60.29 | f | ----- | z | ----- | z | 52.42 | k | 45.87 | a | 32.98 | a | 8.63 | 30.45 | d | ||||||
1965 | 5.10 | 8.91 | 16.55 | 40.67 | 54.90 | 61.37 | 66.36 | b | 65.52 | 49.17 | 48.18 | 29.82 | 22.61 | 39.10 | ||||||||||||
1966 | -1.68 | a | 12.57 | 31.17 | a | 37.95 | 51.21 | 65.73 | b | 70.07 | j | 63.67 | h | 58.04 | f | 45.52 | j | 28.19 | l | 15.24 | b | 30.31 | e | |||
1967 | 12.18 | 6.02 | 24.58 | e | 40.59 | b | 48.23 | a | 62.83 | g | 68.14 | j | 65.89 | c | 58.75 | b | 46.14 | f | 30.83 | g | 19.07 | h | 36.61 | e | ||
1968 | 9.67 | b | 10.46 | a | 36.10 | g | 45.76 | c | 52.17 | j | 63.38 | i | 65.55 | j | 65.29 | g | 58.11 | g | 49.89 | c | ----- | z | ----- | z | 28.95 | h |
1969 | ----- | z | 20.09 | k | 22.19 | b | 43.38 | a | 55.16 | f | ----- | z | 67.03 | m | 68.19 | r | 57.34 | h | 40.46 | f | 29.44 | d | 20.24 | f | 31.67 | i |
1970 | 1.65 | e | 10.66 | c | 20.31 | d | 39.80 | 51.07 | b | 65.88 | a | 71.29 | c | 68.13 | l | 56.67 | g | 48.56 | m | 29.14 | e | 11.96 | h | 36.23 | d | |
1971 | -0.31 | j | 12.40 | c | 22.00 | c | 43.20 | b | 51.31 | b | 66.52 | e | 63.93 | d | 61.50 | p | 55.19 | d | 47.73 | c | 29.07 | a | 13.53 | 40.49 | b | |
1972 | 4.56 | e | 6.41 | f | 22.70 | c | 37.80 | 58.24 | 62.15 | 65.84 | 66.13 | 54.65 | 42.29 | 29.62 | e | 9.00 | 41.18 | a | ||||||||
1973 | 14.11 | d | 17.62 | 36.23 | a | 41.84 | e | 52.55 | 64.50 | 67.68 | 68.65 | 56.38 | 51.32 | 30.50 | a | 14.39 | 42.98 | |||||||||
1974 | 8.10 | 14.61 | 27.44 | d | 42.81 | a | 49.89 | d | 63.07 | 71.08 | 63.29 | 52.40 | a | 46.81 | 32.50 | 21.89 | 41.16 | |||||||||
1975 | 11.18 | 5.71 | n | ----- | z | 39.00 | e | 59.82 | f | 64.32 | e | 72.11 | 66.07 | c | 54.25 | 49.08 | 31.32 | 14.45 | 44.64 | c | ||||||
1976 | 6.57 | a | 23.67 | 26.52 | 47.43 | 55.62 | f | 66.95 | a | 69.41 | b | 68.02 | 57.95 | 38.14 | b | 22.14 | b | 5.38 | b | 39.29 | a | |||||
1977 | -2.65 | h | 18.54 | 33.10 | b | 48.31 | a | 64.32 | a | 65.34 | a | 70.38 | c | 60.98 | 56.80 | 45.92 | 34.79 | i | 17.68 | t | 51.52 | c | ||||
1978 | 4.55 | 9.48 | 27.27 | 40.75 | f | 57.06 | e | 63.96 | d | 67.00 | a | 66.87 | 60.76 | a | 46.95 | a | 27.18 | 8.98 | a | 40.01 | a | |||||
1979 | -1.17 | a | 6.34 | 25.41 | b | 37.67 | 50.73 | c | 62.00 | 68.06 | d | 63.78 | b | 60.81 | q | ----- | z | ----- | z | ----- | z | 39.10 | d | |||
1980 | ----- | z | ----- | z | ----- | z | 54.50 | u | 58.29 | 62.86 | a | 69.30 | a | 65.98 | d | 55.27 | 41.57 | a | 33.09 | c | 14.85 | 50.15 | d | |||
1981 | 8.82 | k | 19.96 | a | 32.92 | a | 44.88 | i | 53.79 | 61.98 | d | 67.53 | a | 65.82 | c | 55.09 | a | 42.91 | b | 35.91 | a | 14.44 | d | 45.04 | b | |
1982 | -2.76 | b | 15.78 | l | ----- | z | 38.12 | a | 57.69 | d | 57.43 | b | 68.42 | a | 63.43 | b | 54.60 | a | 46.31 | d | 25.36 | a | 22.38 | k | 45.40 | c |
1983 | 10.83 | j | 19.04 | e | 29.26 | j | 39.75 | d | 48.98 | g | 59.81 | i | 71.71 | n | 71.91 | i | 54.82 | m | 45.71 | j | 32.55 | k | 2.02 | j | 29.40 | j |
1984 | 8.29 | l | 24.65 | i | 21.48 | k | 44.46 | f | 51.68 | l | 64.28 | l | 67.08 | k | 69.62 | g | 51.74 | e | 48.40 | b | 27.86 | b | 11.52 | b | 34.88 | h |
1985 | 5.47 | a | 8.84 | c | 32.13 | a | 45.83 | a | 57.40 | a | 58.95 | 67.32 | 63.20 | a | 54.61 | c | 43.07 | d | 20.43 | 1.69 | 38.25 | |||||
1986 | 12.19 | 11.30 | 28.60 | 45.32 | 55.89 | 63.91 | a | 69.45 | a | 62.98 | 55.59 | a | 45.12 | a | 23.67 | a | 17.69 | 40.98 | ||||||||
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.25 | b | 20.85 | a | 26.55 | j |
1988 | 3.85 | d | 8.04 | c | 26.26 | d | 41.93 | 60.90 | 66.18 | 70.76 | 66.56 | 55.88 | b | 40.11 | d | 28.92 | e | 13.74 | d | 40.26 | ||||||
1989 | 12.74 | b | 0.17 | h | 22.52 | d | 39.46 | f | 54.11 | d | 62.64 | b | 70.18 | 66.60 | 57.05 | b | 45.59 | d | 25.25 | f | 4.00 | h | 48.93 | d | ||
1990 | 20.19 | d | 17.25 | d | 29.27 | 41.15 | d | 51.71 | 64.07 | 66.13 | 64.87 | ----- | z | 41.95 | 31.90 | 13.52 | d | 40.18 | a | |||||||
1991 | 6.74 | f | 20.81 | d | 29.44 | d | ----- | z | ----- | z | 65.50 | 66.98 | 68.33 | b | 55.89 | b | 41.45 | b | 23.13 | d | 15.34 | b | 42.99 | c | ||
1992 | 16.95 | b | 22.60 | 27.72 | a | 39.27 | 55.77 | 62.21 | d | 60.67 | a | 62.38 | a | 53.85 | f | 42.40 | a | 25.25 | h | 16.55 | k | 43.33 | c | |||
1993 | 7.14 | j | 13.31 | j | 23.82 | n | 39.29 | d | 52.03 | m | 61.04 | d | 64.77 | e | 65.37 | h | 51.26 | i | 40.85 | h | 23.30 | j | 17.77 | i | 55.03 | i |
1994 | -3.52 | g | 5.42 | c | 29.00 | c | 40.50 | 55.54 | f | 64.77 | b | 64.48 | a | 61.65 | a | 57.43 | 47.45 | a | 32.89 | b | 19.38 | c | 42.30 | b | ||
1995 | 11.02 | a | 9.70 | a | 26.47 | b | 35.50 | a | 51.80 | a | 66.56 | d | 65.64 | b | 66.41 | b | 56.26 | e | 43.93 | b | 20.63 | c | 12.10 | 38.83 | ||
1996 | -1.85 | a | 10.29 | 17.24 | 36.52 | b | 50.64 | b | 62.98 | 64.68 | 65.46 | c | 55.98 | 45.06 | 20.62 | 9.66 | 36.44 | |||||||||
1997 | 4.06 | 13.12 | 24.34 | 38.22 | 46.63 | 66.38 | a | 66.23 | a | 61.55 | a | 58.91 | a | 44.93 | a | 25.64 | a | 23.61 | 39.47 | |||||||
1998 | 14.22 | a | 28.59 | 26.42 | 43.72 | a | 60.62 | b | 60.87 | 66.19 | 66.87 | 59.47 | 48.31 | 33.00 | 19.87 | 44.01 | ||||||||||
1999 | 8.31 | 22.11 | a | 29.89 | 44.12 | 55.35 | a | 62.05 | 72.42 | a | 64.77 | a | 55.33 | a | 42.58 | 38.13 | 22.65 | 43.14 | ||||||||
2000 | 10.63 | a | 22.98 | a | ----- | z | 41.50 | 54.78 | a | 59.77 | ----- | z | 65.74 | 54.43 | 48.90 | 29.64 | a | 3.48 | 39.19 | b | ||||||
2001 | 17.10 | 6.81 | a | 24.13 | 42.45 | 55.97 | a | 65.12 | 69.32 | 68.37 | ----- | z | 45.40 | 41.92 | 23.06 | 41.79 | a | |||||||||
2002 | 17.74 | 23.27 | 18.10 | 38.72 | 46.63 | a | 65.57 | 69.92 | 64.10 | 57.80 | 35.61 | 28.92 | 21.74 | 40.68 | ||||||||||||
2003 | 10.32 | a | 10.54 | 23.47 | 42.13 | 53.43 | b | 60.42 | 66.56 | ----- | z | 56.53 | 45.84 | 27.62 | 22.42 | a | 38.12 | a | ||||||||
2004 | 1.52 | a | 17.88 | 29.42 | 42.15 | 48.06 | 59.18 | 65.68 | 60.66 | 61.75 | 46.06 | 35.43 | a | 18.24 | b | 40.50 | ||||||||||
2005 | 7.39 | 20.45 | ----- | z | 47.23 | 51.21 | 66.82 | 69.93 | a | 65.82 | 60.33 | 46.87 | 32.90 | 20.13 | 44.46 | a | ||||||||||
2006 | ----- | z | 11.73 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 11.73 | k | |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.67 | o | 46.48 | 30.70 | 9.29 | 28.82 | i | |||
2009 | 3.23 | 14.57 | 23.60 | 41.30 | 50.22 | a | 59.53 | a | ----- | z | 61.28 | b | 62.08 | 40.35 | 39.47 | 13.63 | 37.20 | a | ||||||||
2010 | 10.23 | 13.93 | 35.62 | b | 48.28 | 55.12 | a | 62.41 | b | 69.40 | f | 70.25 | g | 54.08 | 49.82 | 32.03 | a | 13.29 | 37.48 | b | ||||||
2011 | 3.81 | 12.91 | 23.55 | 39.95 | 51.44 | 64.73 | q | ----- | z | 68.57 | b | 56.33 | 50.68 | 32.40 | a | 25.50 | 36.51 | b | ||||||||
2012 | 18.00 | 22.78 | 35.42 | l | ----- | z | 54.02 | 65.73 | h | 73.71 | j | 61.96 | q | 54.85 | q | 41.83 | j | 32.48 | 17.92 | 29.04 | g | |||||
2013 | 10.50 | x | 13.02 | 16.98 | f | 32.38 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.70 | j | |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | 53.90 | 64.82 | 66.87 | 68.19 | 58.05 | a | 45.31 | 21.57 | 21.34 | 50.01 | d | |||||||
2015 | 13.47 | 4.54 | 30.32 | a | 42.70 | 51.76 | f | 63.40 | a | 69.89 | d | 63.36 | i | 64.83 | a | 46.33 | a | 40.35 | g | 25.10 | u | 41.93 | d | |||
2016 | 11.95 | 20.95 | 34.71 | 41.02 | 54.58 | 62.65 | 68.77 | 68.63 | a | 59.67 | 48.87 | 40.41 | b | ----- | z | 46.56 | a | |||||||||
2017 | 14.45 | a | 21.88 | 26.05 | 45.16 | k | 52.90 | a | 63.43 | 68.71 | ----- | z | 60.72 | e | 46.24 | 24.34 | h | 11.75 | a | 40.68 | c | |||||
2018 | 9.58 | 8.21 | 26.24 | 31.58 | 54.39 | h | ----- | z | ----- | z | 65.44 | 58.15 | 39.92 | 31.90 | y | 19.63 | 32.34 | d | ||||||||
2019 | 4.89 | 3.93 | 20.90 | 33.60 | o | 48.65 | 64.32 | 69.61 | v | 60.29 | s | 58.23 | 47.13 | e | ----- | z | ----- | z | 35.44 | e | ||||||
2020 | 13.66 | b | 14.90 | 29.09 | c | 39.47 | 53.23 | 65.95 | 69.87 | 68.10 | 54.30 | 38.72 | a | 34.70 | 20.34 | 41.86 | ||||||||||
2021 | 18.87 | 5.59 | 33.31 | 41.52 | 55.11 | 69.30 | 70.31 | 70.44 | 60.63 | 50.90 | 32.25 | 17.98 | a | 43.85 | ||||||||||||
2022 | 2.21 | 3.21 | 24.71 | 35.15 | 53.60 | a | 65.05 | 69.90 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.26 | e | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.73 | 13.99 | 26.72 | 40.95 | 53.74 | 63.63 | 67.96 | 65.67 | 57.00 | 45.50 | 30.17 | 15.47 | 40.81 | |||||||||||||
S.D. | 5.94 | 6.23 | 4.85 | 3.63 | 3.63 | 2.47 | 2.47 | 2.54 | 2.91 | 3.78 | 5.15 | 5.76 | 2.10 | |||||||||||||
SKEW | -0.02 | 0.25 | -0.09 | -0.19 | 0.38 | -0.32 | -0.48 | -0.26 | 0.09 | -0.24 | -0.14 | -0.29 | -0.23 | |||||||||||||
MAX | 20.19 | 28.59 | 36.23 | 48.31 | 64.32 | 69.30 | 72.42 | 70.44 | 64.83 | 55.53 | 41.92 | 25.50 | 44.01 | |||||||||||||
MIN | -2.76 | 3.21 | 16.55 | 31.58 | 46.63 | 57.43 | 60.67 | 60.66 | 49.17 | 35.61 | 20.43 | 1.69 | 36.44 | |||||||||||||
YRS | 47 | 52 | 48 | 50 | 48 | 50 | 43 | 41 | 45 | 51 | 48 | 47 | 16 |