YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 71.62 | w | 67.69 | b | 54.52 | 38.60 | 16.90 | 20.68 | 39.68 | g | ||||
1960 | 6.71 | 10.66 | 14.10 | b | 37.98 | 51.77 | 59.15 | 64.40 | b | 66.76 | b | 55.38 | 45.02 | 28.62 | 6.19 | 37.23 | ||||||||||
1961 | 3.52 | a | 17.29 | 29.95 | 34.39 | c | 50.50 | b | 64.60 | 65.57 | d | 67.07 | b | 54.25 | 45.04 | c | 25.72 | a | 8.10 | b | 38.83 | |||||
1962 | -2.16 | 3.32 | 24.21 | 35.43 | b | 52.85 | a | 64.46 | f | 64.40 | e | 65.10 | a | 52.95 | 47.34 | 32.29 | a | 12.55 | 35.30 | a | ||||||
1963 | -2.55 | 4.25 | b | 26.97 | b | 41.58 | 50.85 | 65.88 | 68.74 | b | 64.87 | a | 58.27 | 54.68 | 31.00 | 1.43 | d | 38.83 | ||||||||
1964 | 10.68 | a | 11.48 | 15.84 | 40.84 | b | 56.38 | a | 60.45 | b | 68.42 | 60.33 | b | 52.33 | 44.12 | b | 27.87 | c | 3.65 | 37.70 | ||||||
1965 | -2.02 | b | 4.96 | 12.13 | 39.78 | e | 52.24 | b | 60.91 | c | 63.64 | b | 63.21 | c | 46.88 | 45.27 | a | 23.72 | 18.28 | b | 35.75 | |||||
1966 | -8.96 | f | 4.06 | l | ----- | z | ----- | z | 53.00 | y | 62.54 | f | 69.85 | g | 62.53 | b | 54.46 | c | 43.24 | d | 20.48 | a | 9.50 | 38.04 | g | |
1967 | 5.14 | b | 0.20 | 22.32 | 36.67 | a | 46.06 | 60.10 | a | 64.91 | b | 62.40 | 56.98 | 41.55 | 26.16 | a | ----- | z | 38.41 | a | ||||||
1968 | 3.34 | 4.21 | a | 28.89 | 40.82 | 49.47 | 60.48 | a | 63.17 | a | 61.60 | a | 55.35 | 44.53 | 27.82 | 8.02 | 37.31 | |||||||||
1969 | -1.13 | 11.41 | 16.48 | a | 42.90 | 52.63 | 53.75 | b | 64.90 | a | 68.60 | 55.53 | 38.20 | a | 27.87 | 14.98 | 37.18 | |||||||||
1970 | -1.35 | 4.14 | c | 13.66 | 35.86 | a | 49.81 | 64.32 | 68.85 | a | 64.12 | a | 55.17 | 44.41 | c | 18.36 | l | 3.89 | c | 36.62 | a | |||||
1971 | -6.52 | 8.73 | 21.48 | d | 39.36 | a | 49.43 | b | 63.85 | 61.13 | a | 63.88 | a | 54.67 | a | 45.42 | a | 25.65 | d | 8.53 | b | 36.30 | ||||
1972 | -5.08 | a | 1.27 | a | 19.55 | 36.21 | a | 57.72 | a | 60.18 | e | 61.57 | a | 64.98 | 50.70 | 40.47 | ----- | z | ----- | z | 38.76 | b | ||||
1973 | 10.74 | 13.52 | 34.27 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.17 | j | 24.00 | 8.08 | 18.12 | g | |||||
1974 | -2.05 | a | 6.12 | 17.26 | 39.07 | 47.35 | 61.52 | a | 68.60 | 60.13 | a | 49.05 | 41.94 | o | ----- | z | ----- | z | 38.56 | c | ||||||
1975 | 6.33 | g | 7.29 | d | 14.58 | 32.86 | a | 54.58 | f | 58.15 | 67.50 | 59.39 | v | 49.89 | k | 44.22 | b | 28.57 | 8.22 | d | 32.67 | d | ||||
1976 | 1.09 | b | 17.81 | 16.77 | a | 43.45 | a | 45.62 | s | 63.83 | 67.29 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.59 | g | ||
1977 | 5.12 | s | 13.25 | 30.59 | b | 43.71 | p | 64.26 | l | 64.77 | q | ----- | z | 60.63 | p | 52.39 | g | 42.89 | m | 20.19 | i | 2.20 | h | 21.92 | j | |
1978 | -2.19 | g | 3.23 | b | 19.52 | 38.39 | b | 57.57 | j | 59.78 | e | 66.90 | a | 66.50 | 57.27 | 42.90 | 19.20 | 1.89 | 37.56 | b | ||||||
1979 | -10.26 | -1.14 | 21.74 | h | 34.00 | ----- | z | 61.33 | j | 66.11 | 59.02 | 54.88 | 38.29 | 22.82 | 18.13 | a | 31.32 | c | ||||||||
1980 | 1.13 | a | 5.48 | g | 17.08 | 43.72 | c | 58.00 | 59.78 | 66.67 | d | 61.47 | 51.83 | 39.37 | 31.05 | h | 4.64 | b | 40.37 | b | ||||||
1981 | 7.29 | 16.41 | 32.06 | 42.77 | 52.62 | a | 58.48 | a | 64.95 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.94 | f | ||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.77 | f | 44.90 | k | 23.78 | g | 20.03 | m | ----- | z |
1983 | 12.17 | g | 19.98 | d | 28.15 | e | 40.56 | e | 50.15 | g | 61.98 | f | 72.71 | g | 68.20 | k | 52.27 | j | 42.08 | f | 28.37 | g | -3.35 | h | 29.56 | i |
1984 | 4.06 | e | 24.07 | g | 20.43 | d | 43.58 | d | 49.64 | c | 62.70 | b | 65.08 | e | 70.26 | d | 51.92 | f | 46.56 | g | 27.32 | e | 8.34 | c | 39.04 | c |
1985 | 6.29 | e | 6.04 | a | 28.64 | c | 45.76 | g | 57.82 | c | 56.28 | c | 63.67 | h | 61.54 | h | 52.14 | i | 42.58 | k | 15.91 | g | 0.17 | g | 31.01 | g |
1986 | 12.64 | m | 8.33 | e | 32.32 | f | 43.70 | g | 58.52 | h | 60.04 | p | 68.66 | i | 62.12 | f | 54.13 | g | 44.04 | e | 18.52 | h | 20.42 | g | 26.18 | j |
1987 | 13.68 | f | 24.77 | f | 29.79 | c | 49.38 | e | 57.08 | g | 65.26 | g | 68.54 | e | 62.80 | f | 56.52 | d | 38.73 | g | 31.24 | k | 19.66 | b | 44.78 | g |
1988 | 2.10 | g | 4.90 | d | 24.38 | c | 42.40 | d | 60.20 | f | 70.65 | f | 71.05 | b | 69.38 | f | 54.48 | h | ----- | z | 29.62 | v | 9.82 | f | 35.68 | h |
1989 | 10.00 | h | -1.00 | d | 17.98 | f | 38.13 | d | 55.59 | d | 60.94 | e | 72.00 | e | 65.48 | 53.62 | q | 43.91 | b | 22.84 | b | 0.31 | d | 39.80 | c | |
1990 | 16.42 | 12.43 | 28.63 | 40.33 | a | 52.26 | 63.50 | b | 66.42 | 67.13 | 57.40 | a | 43.48 | 29.80 | b | 8.24 | 40.50 | |||||||||
1991 | 0.65 | a | 17.16 | 27.97 | a | 45.30 | 57.62 | g | 66.24 | a | 67.03 | 67.42 | 54.20 | 39.52 | a | 19.66 | a | 15.60 | a | 38.25 | a | |||||
1992 | 14.87 | 20.12 | 27.57 | a | 38.00 | 55.13 | a | 59.68 | 59.83 | e | 61.06 | 53.85 | f | 42.16 | 25.15 | d | 9.27 | e | 37.53 | a | ||||||
1993 | 5.79 | c | 10.06 | b | 25.55 | a | 39.60 | e | 52.52 | d | 57.72 | e | 62.57 | p | 62.77 | c | 50.54 | d | 37.82 | f | 23.86 | b | 14.54 | d | 34.29 | b |
1994 | -6.96 | h | 4.71 | d | 29.44 | f | 40.48 | i | 52.93 | j | 64.62 | a | 65.02 | f | 63.33 | h | 58.39 | g | 47.98 | g | 32.85 | d | 20.77 | c | 30.74 | h |
1995 | 7.33 | e | 6.50 | c | 26.86 | f | 36.93 | c | 51.07 | c | 68.52 | b | 65.50 | g | 66.34 | c | 50.50 | i | 42.97 | l | 16.46 | c | 6.28 | f | 36.16 | e |
1996 | -6.69 | g | 8.10 | d | 15.02 | d | 31.42 | f | 50.87 | d | 64.57 | g | 64.28 | b | 66.73 | e | 56.35 | f | 44.40 | k | 15.40 | d | 5.92 | e | 32.33 | e |
1997 | 1.69 | g | 11.85 | e | 19.96 | c | 38.24 | g | 48.25 | g | 65.18 | e | 67.52 | f | 64.13 | d | 57.90 | j | 42.58 | f | 22.38 | d | 22.44 | d | 34.33 | f |
1998 | 12.57 | h | 28.08 | c | 26.86 | f | 45.46 | e | 57.88 | n | 59.42 | d | 66.94 | g | 69.31 | e | 60.28 | e | 45.54 | e | 27.67 | f | 13.55 | c | 45.95 | e |
1999 | 5.10 | g | 19.46 | e | 28.52 | d | 43.61 | g | 53.80 | f | 64.13 | o | 68.93 | d | 65.06 | g | 54.31 | f | 42.42 | e | 34.74 | c | 19.42 | f | 38.81 | g |
2000 | 5.36 | f | 20.56 | d | 33.96 | h | 41.15 | g | 53.27 | i | 60.22 | g | 68.21 | e | 66.20 | f | 55.45 | i | 46.26 | h | 26.15 | f | -0.87 | d | 29.30 | i |
2001 | 14.94 | d | 4.81 | g | 26.94 | f | 41.50 | f | 54.21 | c | 57.72 | n | 65.58 | y | 69.06 | f | 56.27 | h | 41.18 | i | 37.50 | i | 19.84 | f | 34.58 | j |
2002 | 15.09 | d | 20.94 | c | 16.02 | f | 38.14 | e | 48.85 | h | 66.26 | g | 70.46 | f | 63.98 | e | 59.32 | h | 34.00 | d | 23.02 | f | 17.81 | d | 31.66 | f |
2003 | 5.70 | d | 6.19 | g | 23.38 | f | 42.05 | j | 54.22 | d | 61.85 | f | 67.32 | f | ----- | z | 55.50 | e | 42.24 | j | 24.16 | h | 20.30 | f | 38.48 | i |
2004 | -0.83 | g | 16.84 | j | 25.52 | f | 39.74 | a | 47.66 | i | 57.27 | h | 64.74 | f | 59.00 | h | 61.97 | a | 44.83 | e | 33.44 | e | 13.97 | a | 38.79 | g |
2005 | 1.93 | a | 16.08 | d | 21.67 | d | 46.28 | g | 50.79 | g | 65.07 | g | 68.66 | 64.94 | e | 60.19 | a | 45.50 | j | 29.11 | h | 16.98 | g | 38.91 | f | |
2006 | 22.02 | a | 8.00 | a | 27.62 | b | 46.61 | g | 55.31 | 63.21 | f | 73.19 | e | 66.15 | h | 56.14 | a | 39.35 | h | 29.28 | g | 19.95 | 37.46 | e | ||
2007 | 10.30 | f | 2.52 | 28.55 | k | 37.83 | 57.39 | c | 65.50 | f | 70.22 | a | 64.53 | a | 57.84 | a | 46.42 | 28.92 | k | 8.75 | c | 43.19 | d | |||
2008 | 4.34 | i | 3.62 | i | 21.61 | i | 38.58 | k | 47.44 | g | 59.52 | d | 65.28 | f | 65.22 | d | ----- | z | 45.11 | h | 27.35 | j | 0.07 | k | 62.37 | j |
2009 | -2.42 | e | 10.41 | f | 23.30 | i | 40.00 | f | ----- | z | 60.15 | f | 61.27 | e | 62.80 | d | 62.24 | e | 38.88 | g | 35.52 | f | 7.83 | g | 45.97 | h |
2010 | 6.00 | k | 10.92 | c | 36.84 | i | 47.74 | g | 55.14 | f | 61.27 | j | 67.90 | f | 68.54 | g | 51.55 | h | 49.16 | i | 28.41 | h | 9.31 | g | 10.92 | k |
2011 | 2.40 | f | 8.55 | h | 21.69 | g | 40.27 | f | 51.45 | j | 60.19 | f | 69.48 | e | 67.39 | h | 55.89 | k | 47.94 | e | 30.40 | j | 23.06 | n | 58.71 | j |
2012 | 15.54 | h | 19.36 | h | 39.67 | h | 43.69 | i | 55.27 | g | 65.86 | l | 72.55 | i | 64.84 | f | 55.67 | 40.95 | a | 27.20 | 12.23 | 34.01 | h | |||
2013 | 6.97 | 9.68 | 18.84 | 31.87 | 52.40 | 62.02 | 67.52 | 66.34 | 60.62 | 41.39 | 23.47 | -1.23 | c | 36.66 | ||||||||||||
2014 | -2.30 | a | -0.70 | f | 13.30 | c | 36.14 | b | 53.00 | b | 62.80 | b | 65.37 | 66.00 | a | 57.97 | a | 44.83 | a | 19.43 | 19.07 | b | 39.60 | a | ||
2015 | 9.29 | 2.00 | 29.76 | b | 43.88 | b | 52.07 | c | 64.02 | a | 69.31 | e | 65.04 | c | 62.17 | f | 46.68 | c | 34.18 | 22.18 | 39.85 | a | ||||
2016 | 9.87 | 17.22 | b | 34.44 | d | 39.77 | 56.16 | c | 63.57 | c | 67.84 | 67.93 | b | 61.20 | o | 45.61 | 39.55 | 11.52 | c | 41.23 | a | |||||
2017 | 10.52 | b | 18.89 | 25.71 | 42.38 | a | 52.40 | b | 63.48 | b | 68.18 | 64.16 | 59.76 | e | 45.83 | b | 23.20 | 8.08 | 40.22 | |||||||
2018 | 7.41 | c | 5.02 | a | 27.34 | c | 34.15 | 58.73 | e | 65.98 | 68.48 | b | 66.40 | a | 55.90 | 38.76 | 20.28 | a | 18.02 | a | 38.87 | |||||
2019 | 2.12 | c | 3.52 | 20.55 | a | 40.13 | 49.59 | c | 61.89 | b | 68.45 | b | 64.65 | a | 57.52 | 41.20 | a | 23.38 | a | 13.13 | a | 37.18 | ||||
2020 | 10.87 | a | 12.10 | 27.31 | 37.16 | a | 51.18 | 65.05 | 69.97 | b | 66.67 | a | 55.67 | a | 35.78 | a | 30.50 | 18.97 | 40.10 | |||||||
2021 | 17.09 | b | 3.02 | 35.08 | a | 40.76 | a | 54.71 | 67.95 | b | 71.18 | 69.07 | c | 60.83 | a | 49.82 | a | 29.25 | 13.85 | a | 42.72 | |||||
2022 | 0.06 | 0.64 | 23.27 | a | 33.57 | a | 53.97 | a | 63.88 | a | 68.69 | 67.13 | 59.07 | c | 46.58 | 27.52 | 9.78 | a | 37.85 | |||||||
2023 | 12.42 | 11.25 | 19.61 | 36.30 | 59.89 | 67.42 | 64.79 | 66.06 | 61.90 | 45.42 | 29.27 | 27.11 | 41.79 | |||||||||||||
2024 | 12.24 | 24.64 | 26.89 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.26 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 5.25 | 10.04 | 23.56 | 39.26 | 53.10 | 62.19 | 66.96 | 65.04 | 56.11 | 43.41 | 26.00 | 11.73 | 38.53 | |||||||||||||
S.D. | 7.11 | 7.08 | 6.27 | 3.74 | 3.20 | 3.25 | 3.00 | 2.56 | 3.55 | 3.81 | 5.38 | 6.90 | 1.97 | |||||||||||||
SKEW | 0.14 | 0.47 | -0.09 | 0.24 | 0.15 | -0.21 | -0.39 | -0.31 | -0.35 | 0.03 | 0.15 | 0.04 | 0.64 | |||||||||||||
MAX | 22.02 | 28.08 | 35.08 | 49.38 | 59.89 | 68.52 | 73.19 | 70.26 | 62.24 | 54.68 | 39.55 | 27.11 | 42.72 | |||||||||||||
MIN | -10.26 | -1.14 | 12.13 | 31.87 | 46.06 | 53.75 | 59.83 | 59.02 | 46.88 | 34.00 | 15.40 | -1.23 | 35.75 | |||||||||||||
YRS | 43 | 52 | 46 | 44 | 38 | 40 | 43 | 44 | 39 | 41 | 40 | 45 | 17 |