YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.33 | 16.87 | 22.60 | j | ||
1955 | 8.84 | 5.57 | 18.74 | 40.27 | 49.77 | 54.82 | b | 68.20 | a | 62.29 | 45.65 | d | 37.30 | a | 16.67 | 3.11 | c | 34.27 | ||||||||
1956 | 2.43 | a | 4.07 | b | 17.74 | d | 28.96 | b | 48.23 | 63.39 | l | 57.68 | 59.65 | 45.52 | a | 43.24 | b | 24.50 | 15.32 | 31.58 | a | |||||
1957 | 0.00 | 14.00 | 22.77 | 33.92 | d | 45.93 | a | 57.27 | d | 67.13 | a | 59.90 | b | 48.07 | a | 36.93 | a | 26.86 | b | 18.52 | 35.94 | |||||
1958 | 16.32 | 4.85 | a | 23.97 | 35.04 | b | 46.68 | 53.87 | 58.28 | b | 60.10 | 50.86 | b | 39.43 | c | 23.23 | h | 7.35 | 36.07 | a | ||||||
1959 | 0.21 | b | 2.15 | a | 22.83 | a | 34.97 | 50.97 | a | 59.72 | a | 59.71 | 63.77 | 50.40 | 35.55 | 15.83 | 22.61 | 34.89 | ||||||||
1960 | 10.48 | 9.59 | 7.48 | 35.93 | 47.45 | 54.76 | a | 59.84 | 60.84 | 52.20 | 38.19 | 27.00 | 9.35 | 34.43 | ||||||||||||
1961 | 5.16 | 14.64 | 25.19 | 31.43 | 43.42 | 57.13 | 59.45 | 59.81 | 49.47 | 39.26 | 24.52 | a | 8.45 | 34.83 | ||||||||||||
1962 | -0.45 | b | 9.96 | 16.45 | 33.68 | e | 53.10 | 57.13 | 59.97 | 59.13 | 47.73 | 42.03 | 29.73 | 13.35 | 35.15 | |||||||||||
1963 | -2.65 | 7.04 | 26.94 | 37.53 | 47.23 | 59.53 | 63.00 | 59.13 | 53.50 | 46.87 | 29.77 | 3.58 | 35.96 | |||||||||||||
1964 | 13.23 | 15.00 | 16.71 | 37.40 | 52.13 | 57.31 | a | 63.94 | 57.35 | 51.73 | 39.10 | 28.87 | 9.50 | a | 36.86 | |||||||||||
1965 | 2.11 | c | 4.73 | b | ----- | z | ----- | z | 49.40 | f | 57.10 | 60.42 | 56.58 | 45.20 | e | ----- | z | 18.44 | l | 22.27 | a | 35.49 | e | |||
1966 | ----- | z | ----- | z | ----- | z | ----- | z | 46.39 | m | 59.43 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | 33.55 | h | 36.32 | 55.77 | 55.10 | 52.23 | 42.37 | 34.14 | b | 21.53 | 12.32 | c | 38.72 | d | ||||||
1968 | 4.35 | 4.21 | 20.87 | a | 32.27 | 38.03 | 55.75 | b | 57.50 | a | 55.29 | 48.10 | 37.62 | b | 24.20 | 9.19 | 32.28 | |||||||||
1969 | -0.74 | 10.54 | b | 8.65 | 35.59 | a | 45.13 | 49.37 | 60.80 | a | 56.23 | a | 46.20 | 34.70 | a | 24.38 | a | 11.06 | 31.83 | |||||||
1970 | -7.68 | 3.07 | 17.29 | 33.97 | 45.84 | 56.90 | 59.26 | 56.70 | a | 46.96 | b | 35.58 | 25.93 | 5.27 | a | 31.59 | ||||||||||
1971 | -2.72 | b | 7.75 | 18.87 | 33.31 | a | 39.70 | a | 59.03 | a | 54.63 | a | 53.13 | 46.41 | a | 41.65 | 25.10 | 11.37 | a | 32.35 | ||||||
1972 | -2.57 | a | 3.29 | a | 19.40 | a | 31.24 | a | 47.57 | c | 52.21 | a | 56.52 | b | 55.07 | b | 45.00 | 34.84 | 27.67 | 3.84 | 31.17 | |||||
1973 | 10.00 | 13.04 | 32.48 | 32.73 | 44.52 | 56.50 | 60.32 | 59.41 | b | 49.27 | 41.84 | 26.80 | 8.94 | 36.32 | ||||||||||||
1974 | 4.97 | 11.36 | 24.81 | 35.57 | 43.84 | 54.07 | 62.61 | 57.29 | 42.52 | a | 38.32 | 25.76 | a | 14.74 | 34.65 | |||||||||||
1975 | 7.07 | a | 5.82 | 14.58 | 31.27 | 49.97 | 56.13 | 61.29 | 59.45 | 45.47 | 39.35 | 27.57 | 16.03 | a | 34.50 | |||||||||||
1976 | 5.33 | a | 18.42 | c | 23.17 | b | 36.82 | b | 42.68 | 54.07 | 58.97 | b | 54.83 | b | 45.70 | 29.58 | 15.47 | -0.41 | b | 32.05 | ||||||
1977 | ----- | z | 11.71 | 27.48 | 39.90 | a | 52.23 | 55.00 | ----- | z | 54.39 | 51.60 | 34.74 | 24.70 | 9.94 | 36.17 | b | |||||||||
1978 | -1.90 | 3.14 | 22.32 | 37.17 | 49.17 | b | 56.93 | 60.65 | 58.61 | 54.90 | 38.03 | 21.33 | 6.00 | 33.86 | ||||||||||||
1979 | -7.00 | -0.79 | 19.77 | 33.70 | 45.19 | 57.10 | 60.52 | 58.58 | 51.63 | 37.39 | 24.70 | 17.87 | a | 33.22 | ||||||||||||
1980 | 9.23 | 9.66 | 22.93 | b | 36.34 | a | 47.77 | 56.90 | 60.45 | 59.61 | 50.13 | 35.55 | 26.97 | 11.10 | 35.55 | |||||||||||
1981 | 6.12 | f | 14.15 | a | 26.00 | 39.97 | a | 46.06 | 58.53 | 62.16 | 57.42 | 48.33 | 39.32 | 31.04 | d | 8.03 | 39.18 | a | ||||||||
1982 | -8.21 | c | 8.61 | 24.96 | c | 33.62 | a | 52.52 | 53.23 | 62.87 | 60.10 | 51.73 | 40.58 | 23.14 | a | 18.86 | b | 35.17 | ||||||||
1983 | 13.41 | d | 20.76 | c | 26.48 | d | 33.17 | 45.13 | 59.00 | a | 65.62 | b | 63.90 | a | 54.13 | g | 40.81 | 29.38 | a | -5.94 | 35.61 | a | ||||
1984 | 8.39 | 16.69 | 15.13 | 35.68 | b | 48.29 | 59.80 | 61.65 | 58.68 | 47.27 | 43.06 | 23.77 | d | 11.28 | b | 35.81 | ||||||||||
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.67 | 59.26 | 56.39 | 52.10 | 38.29 | c | 15.83 | a | -2.97 | 39.08 | e | |||||
1986 | 10.58 | 9.79 | 28.77 | 39.27 | 49.52 | 59.93 | 64.29 | 55.06 | 52.20 | ----- | z | ----- | z | ----- | z | 41.05 | c | |||||||||
1987 | ----- | z | ----- | z | ----- | z | ----- | z | 53.67 | a | 60.45 | a | 65.32 | 58.77 | 51.83 | 34.00 | 30.93 | 19.27 | a | 46.78 | d | |||||
1988 | -0.32 | 6.18 | a | 25.68 | 34.24 | a | 50.46 | e | 60.76 | a | 62.13 | 62.42 | 51.86 | a | 33.60 | a | 26.10 | 11.87 | a | 35.41 | ||||||
1989 | 17.35 | 3.50 | 20.27 | a | 35.60 | 46.50 | a | 56.93 | a | 63.81 | 60.32 | 49.03 | 38.00 | 19.47 | 3.77 | 34.55 | ||||||||||
1990 | 17.23 | a | 14.86 | 27.47 | a | 35.53 | 46.35 | 60.53 | 62.00 | 61.58 | 54.40 | 37.42 | 28.10 | 6.68 | 37.68 | |||||||||||
1991 | 2.26 | 18.11 | 26.39 | 39.80 | 54.26 | 63.83 | a | 63.13 | 61.65 | 51.47 | 36.50 | a | 18.10 | a | 17.13 | 37.72 | ||||||||||
1992 | 17.48 | 22.90 | 27.55 | 35.13 | 47.94 | 56.00 | 56.94 | 55.90 | 49.63 | 37.32 | 26.33 | 13.33 | a | 37.20 | ||||||||||||
1993 | 5.39 | 9.14 | 19.58 | 34.77 | 47.94 | 56.90 | a | 63.29 | 61.84 | 47.67 | 37.81 | 22.80 | 14.87 | 35.17 | ||||||||||||
1994 | -2.58 | 2.96 | 27.42 | 35.27 | 49.58 | 60.97 | a | 59.53 | a | 57.61 | 54.41 | a | 43.26 | 29.70 | 15.55 | 36.14 | ||||||||||
1995 | 10.63 | a | 13.57 | 26.07 | a | 33.43 | 46.61 | 60.70 | 62.50 | a | 65.81 | 49.47 | 40.27 | a | 20.37 | 14.87 | 37.02 | |||||||||
1996 | 2.55 | 12.45 | 18.74 | 32.33 | 46.87 | 60.10 | 60.03 | a | 58.84 | 50.73 | 39.06 | 19.04 | b | 7.68 | 34.04 | |||||||||||
1997 | 4.00 | 14.54 | 24.94 | 33.07 | 43.32 | 59.57 | 63.23 | 59.97 | 53.37 | 41.42 | 22.63 | 22.56 | f | 38.19 | a | |||||||||||
1998 | 11.08 | f | 25.25 | 23.84 | 39.87 | 53.15 | d | 64.17 | x | 60.52 | d | 61.00 | a | 52.28 | a | 38.72 | b | 29.43 | b | 18.17 | h | 42.67 | c | |||
1999 | 3.10 | a | 19.43 | 24.07 | a | 36.72 | a | 49.24 | b | 58.10 | 63.38 | b | 58.29 | 45.90 | a | 32.61 | 29.18 | b | 13.52 | d | 36.13 | |||||
2000 | 3.72 | b | 16.96 | a | 28.90 | 33.67 | c | 48.10 | 54.46 | b | 60.52 | 58.93 | a | 45.23 | d | 38.90 | 19.40 | -4.50 | c | 33.69 | ||||||
2001 | 8.43 | c | -0.30 | h | 17.17 | b | 36.25 | b | 49.47 | a | 57.18 | b | 62.90 | 59.81 | 48.54 | b | 34.56 | d | 33.12 | d | 18.06 | 38.68 | a | |||
2002 | 14.29 | c | 17.50 | b | 16.70 | a | ----- | z | ----- | z | 64.17 | r | 62.64 | c | 56.39 | c | 47.09 | g | 31.55 | 20.28 | a | 15.48 | b | 29.35 | d | |
2003 | 4.47 | a | 2.96 | 17.83 | a | 34.41 | a | 43.59 | d | 55.36 | b | 59.70 | a | 58.85 | e | 44.19 | d | 34.68 | 21.07 | b | 14.75 | c | 32.66 | |||
2004 | 4.28 | m | 9.57 | a | 26.65 | 31.96 | c | 45.37 | d | 53.12 | f | 58.16 | 52.39 | c | 51.56 | e | 38.74 | 27.32 | b | 14.46 | c | 35.62 | b | |||
2005 | 5.37 | a | 18.07 | 20.13 | h | 38.03 | 44.58 | 61.57 | g | 61.79 | c | 56.37 | a | 49.25 | f | 37.77 | 25.10 | a | 6.17 | b | 32.58 | c | ||||
2006 | 20.63 | l | 5.00 | y | ----- | z | 40.23 | 46.55 | 55.62 | d | 62.18 | c | 60.68 | 45.75 | f | 33.58 | 23.00 | a | 18.63 | a | 42.56 | d | ||||
2007 | 7.93 | a | -3.39 | e | 28.04 | e | 32.25 | b | 50.94 | 57.67 | f | 59.11 | d | 60.12 | f | 47.05 | h | 42.77 | 22.79 | b | 6.29 | c | 27.41 | c | ||
2008 | 2.17 | a | 4.25 | i | 19.54 | c | 32.21 | b | 42.25 | g | 55.65 | d | 59.59 | d | 54.88 | f | 48.56 | c | 35.59 | d | 24.44 | c | 2.07 | d | 31.09 | c |
2009 | -3.73 | e | 11.44 | l | 21.85 | d | 31.57 | b | 45.67 | g | 54.41 | h | 55.92 | e | 51.81 | j | 47.74 | g | 32.82 | c | 29.45 | a | 4.90 | b | 24.68 | e |
2010 | 0.69 | e | 2.27 | m | 23.80 | f | 38.14 | b | 45.74 | d | 57.92 | e | 61.19 | e | 59.28 | m | 47.71 | f | 37.33 | a | 22.76 | e | 7.23 | 33.88 | d | |
2011 | 2.86 | i | 8.00 | c | 19.95 | l | 34.36 | b | 46.17 | b | 56.46 | d | 65.83 | a | 58.40 | f | 45.70 | g | 36.34 | b | 21.42 | f | 15.04 | c | 37.46 | e |
2012 | 13.35 | n | 17.15 | b | 33.27 | e | 35.12 | e | 49.69 | b | 59.56 | e | 64.40 | a | 57.25 | g | 44.12 | f | 34.43 | c | 23.77 | h | 12.64 | c | 38.28 | d |
2013 | 6.89 | l | 8.04 | b | 16.92 | e | 28.84 | e | 45.22 | d | 59.11 | c | 60.14 | b | 61.16 | l | 51.21 | f | 35.93 | c | 19.07 | b | 2.25 | c | 30.61 | c |
2014 | -3.20 | f | -0.90 | h | 15.24 | j | 30.31 | d | 43.79 | b | 58.35 | g | 54.11 | l | 58.32 | l | 47.58 | d | 36.52 | 13.96 | e | 15.88 | e | 31.34 | f | |
2015 | 8.40 | f | 0.94 | l | 23.92 | f | 35.21 | f | 44.62 | g | 56.56 | e | 58.00 | e | 53.18 | n | 54.96 | e | 37.17 | b | 27.17 | g | 20.75 | g | 51.67 | h |
2016 | 5.65 | e | 11.80 | n | 27.64 | c | 38.50 | p | 45.90 | b | 59.00 | e | 60.61 | h | 58.39 | m | 52.84 | e | 36.89 | m | 31.89 | b | 10.26 | h | 37.15 | f |
2017 | 12.04 | g | 16.76 | k | 13.73 | p | 37.00 | b | 43.27 | i | 56.50 | d | 59.48 | h | 53.47 | l | 50.00 | j | 38.07 | b | 18.58 | k | 8.92 | f | 43.86 | i |
2018 | 1.95 | j | 2.76 | c | 23.88 | o | 21.86 | b | 51.81 | d | 61.56 | c | 60.06 | 58.10 | 52.83 | 33.55 | 16.83 | 15.68 | 37.50 | b | ||||||
2019 | 3.65 | -1.32 | 16.57 | a | 33.10 | 41.72 | b | 56.89 | b | 62.13 | a | 55.84 | 54.40 | 32.79 | b | 19.80 | 13.93 | a | 32.46 | |||||||
2020 | 9.48 | 8.70 | b | 26.55 | 28.80 | 45.38 | b | 59.57 | b | 60.50 | a | 56.48 | d | 46.97 | 30.65 | 25.48 | a | 13.52 | 34.34 | |||||||
2021 | 12.30 | d | 0.21 | 28.06 | 33.37 | 45.85 | d | 58.73 | 59.10 | 57.67 | d | 46.94 | l | 40.82 | c | 23.86 | b | 14.10 | 34.01 | a | ||||||
2022 | -3.94 | 1.46 | 22.45 | 28.03 | 45.71 | 57.17 | 60.48 | 57.75 | c | 48.20 | 33.77 | 22.70 | 7.55 | 31.78 | ||||||||||||
2023 | 9.48 | h | 7.52 | c | 16.75 | g | 32.14 | h | 47.67 | j | 58.11 | l | 55.76 | n | 59.61 | m | 51.17 | x | 38.38 | e | 23.23 | 21.13 | 22.57 | h | ||
2024 | 8.00 | j | 21.52 | h | 21.00 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.73 | 9.64 | 22.42 | 34.43 | 47.10 | 57.32 | 60.99 | 58.47 | 49.38 | 37.38 | 24.28 | 10.96 | 34.56 | |||||||||||||
S.D. | 6.55 | 6.54 | 5.31 | 3.41 | 3.63 | 2.54 | 2.72 | 2.79 | 3.25 | 3.35 | 4.47 | 6.36 | 1.81 | |||||||||||||
SKEW | 0.12 | 0.24 | -0.51 | -0.71 | -0.38 | -0.26 | 0.14 | 0.04 | -0.16 | 0.17 | -0.32 | -0.54 | -0.16 | |||||||||||||
MAX | 17.48 | 25.25 | 33.27 | 40.27 | 54.26 | 63.83 | 68.20 | 65.81 | 54.96 | 46.87 | 33.12 | 22.61 | 37.72 | |||||||||||||
MIN | -8.21 | -3.39 | 7.48 | 21.86 | 36.32 | 49.37 | 54.63 | 52.23 | 42.37 | 29.58 | 13.96 | -5.94 | 31.17 | |||||||||||||
YRS | 52 | 56 | 55 | 60 | 60 | 59 | 63 | 56 | 55 | 65 | 62 | 63 | 37 |