YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | ----- | z | 42.71 | g | 56.79 | a | 59.59 | b | 57.74 | 50.21 | a | 30.86 | b | 21.55 | a | 11.27 | a | 41.14 | e | |
1953 | 3.03 | b | 8.75 | 20.10 | 28.41 | a | 43.45 | 55.54 | d | 60.17 | b | 60.28 | b | 50.70 | j | 41.90 | a | 26.03 | 8.87 | 32.41 | a | |||||
1954 | -6.17 | b | 21.04 | c | 15.97 | a | 30.57 | b | 39.73 | a | 55.77 | 61.48 | 57.94 | 49.37 | 36.29 | 25.56 | n | 16.39 | c | 34.40 | a | |||||
1955 | 3.77 | a | -0.39 | 12.73 | a | 38.53 | 49.68 | 56.15 | q | 64.38 | r | 61.13 | p | 47.50 | b | 37.29 | 10.67 | -1.06 | 22.08 | c | ||||||
1956 | 0.06 | 0.41 | 13.60 | a | 25.03 | 45.61 | 58.67 | c | 56.93 | a | 57.68 | 45.40 | 39.90 | 20.66 | a | 12.10 | 31.34 | |||||||||
1957 | -5.94 | 6.04 | 17.39 | 31.60 | 43.52 | 52.87 | 63.90 | a | 58.84 | 45.93 | 37.41 | d | 23.13 | 15.41 | b | 32.51 | ||||||||||
1958 | 10.03 | a | 2.93 | 21.00 | a | 32.67 | 45.52 | 48.87 | 56.39 | 56.94 | 48.83 | 36.81 | d | 20.20 | 2.19 | 31.86 | ||||||||||
1959 | -2.83 | b | -1.29 | 20.90 | 29.54 | b | 43.32 | 56.47 | 58.00 | 60.45 | 47.69 | a | 30.52 | b | 13.90 | a | 18.07 | a | 31.23 | |||||||
1960 | 1.50 | a | 2.52 | 3.74 | 32.38 | a | 43.94 | 50.90 | a | 57.78 | d | 56.44 | d | 48.20 | 34.66 | b | 19.86 | b | 3.73 | a | 29.64 | |||||
1961 | 0.57 | a | 10.46 | 24.38 | b | 26.20 | 41.58 | 54.57 | b | 56.90 | b | 58.87 | a | 45.27 | 35.84 | 20.08 | f | 0.83 | b | 32.31 | a | |||||
1962 | -3.60 | a | 2.29 | 15.77 | a | 29.14 | a | 47.40 | a | 55.07 | a | 57.03 | b | 57.18 | c | 44.30 | 37.53 | a | 26.52 | a | 11.00 | d | 31.64 | |||
1963 | -6.39 | 3.54 | 22.52 | 34.57 | 44.23 | 58.27 | 61.10 | a | 58.57 | a | 51.97 | 45.35 | 25.46 | b | -0.25 | c | 33.24 | |||||||||
1964 | 7.13 | a | 9.54 | a | 9.37 | a | 33.52 | a | 46.42 | 53.66 | a | 61.60 | f | 54.84 | 45.43 | b | 35.06 | 19.54 | b | -0.35 | e | 28.56 | a | |||
1965 | -4.77 | a | -0.71 | 6.23 | 31.77 | 44.97 | 54.55 | a | 60.19 | 57.07 | a | 40.63 | 38.63 | a | 19.96 | c | 16.19 | d | 30.39 | |||||||
1966 | -9.45 | 0.21 | 22.26 | 27.28 | a | 40.45 | 54.47 | 62.42 | 54.81 | 46.20 | 35.00 | 16.97 | 8.82 | c | 29.95 | |||||||||||
1967 | 2.94 | -2.82 | 20.48 | 31.50 | 39.37 | a | 53.00 | 55.48 | b | 53.90 | a | 46.00 | 33.81 | 20.10 | a | 9.14 | c | 30.24 | ||||||||
1968 | 1.50 | a | 2.83 | 22.06 | 32.03 | 40.45 | 54.80 | 57.61 | 56.35 | 47.73 | 36.81 | 23.93 | 4.87 | 31.75 | ||||||||||||
1969 | -6.39 | 8.50 | 6.65 | 34.77 | 45.61 | 47.61 | b | 56.81 | 58.20 | a | 47.36 | b | 31.42 | 21.87 | 10.16 | 30.21 | ||||||||||
1970 | -6.63 | a | 3.14 | 11.39 | 29.97 | 43.58 | 57.07 | a | 59.39 | c | 57.30 | a | 46.10 | 36.00 | 20.52 | a | 3.32 | 30.10 | ||||||||
1971 | -5.32 | 4.32 | 18.58 | 32.13 | 41.24 | b | 58.17 | 55.10 | 56.27 | a | 48.27 | 38.97 | 21.83 | 4.03 | 31.13 | |||||||||||
1972 | -5.00 | -2.31 | 16.58 | 30.90 | 49.10 | a | 54.17 | a | 56.87 | 59.06 | 45.76 | a | 32.26 | 22.00 | a | -1.84 | 29.80 | |||||||||
1973 | 4.97 | 10.75 | 28.35 | 31.33 | 42.55 | 53.97 | 57.63 | a | 61.10 | 47.27 | 42.00 | 21.07 | 5.77 | 33.90 | ||||||||||||
1974 | -2.35 | 3.89 | 17.32 | 32.87 | 42.13 | 52.40 | 62.74 | 53.93 | a | 41.90 | 37.07 | a | 22.93 | 12.61 | 31.45 | |||||||||||
1975 | 2.90 | 1.00 | 10.23 | a | 27.80 | 45.62 | b | 54.80 | 60.94 | 55.32 | 43.10 | 36.59 | b | 23.00 | 8.19 | 30.79 | ||||||||||
1976 | -0.77 | 13.00 | 16.61 | 33.07 | b | 40.23 | a | 52.34 | a | 57.63 | a | 55.93 | c | 43.00 | c | 27.85 | d | 11.63 | 0.16 | 29.22 | ||||||
1977 | -11.30 | a | 11.04 | a | 22.52 | 37.33 | 52.68 | 54.33 | 59.19 | 52.17 | a | 48.43 | 35.40 | a | 18.20 | 2.87 | 31.91 | |||||||||
1978 | -10.68 | -1.96 | 14.61 | 33.23 | 47.00 | 53.93 | a | 59.37 | a | 58.77 | 52.73 | 35.71 | 15.63 | 2.61 | 30.08 | |||||||||||
1979 | -9.80 | a | -9.48 | a | 11.57 | a | 26.57 | 38.35 | 53.20 | 59.55 | 56.61 | 48.97 | 33.90 | 19.00 | 14.42 | 28.57 | ||||||||||
1980 | 2.35 | 4.48 | 12.81 | 33.17 | 46.26 | 54.83 | 59.45 | 57.58 | 47.43 | 33.87 | 24.53 | 7.55 | 32.03 | |||||||||||||
1981 | 5.29 | 10.36 | ----- | z | 36.47 | 43.61 | 53.50 | 59.97 | 57.50 | a | 46.53 | 35.55 | b | 25.27 | h | 2.30 | h | 38.75 | c | |||||||
1982 | -14.28 | m | 2.73 | b | 16.35 | 27.70 | 47.26 | 47.93 | 60.68 | 56.84 | 45.43 | 35.48 | 16.43 | 12.67 | a | 33.59 | a | |||||||||
1983 | 10.03 | 15.14 | 22.34 | b | 28.10 | a | 41.07 | a | 53.80 | 63.77 | 63.10 | 48.23 | 37.00 | a | 23.59 | c | -10.13 | a | 33.00 | |||||||
1984 | 2.74 | 17.86 | 13.87 | a | 33.62 | a | 42.13 | 55.30 | 58.71 | 59.61 | 41.87 | 36.43 | a | 20.63 | 2.23 | a | 32.08 | |||||||||
1985 | -4.33 | a | 2.21 | 21.97 | 33.83 | a | ----- | z | 51.60 | 58.71 | 54.65 | 47.73 | 35.74 | 10.27 | -4.48 | 27.99 | a | |||||||||
1986 | 3.86 | c | 1.71 | 22.00 | 33.67 | 45.80 | a | 57.10 | 60.87 | a | 55.33 | a | 48.70 | 37.84 | 16.47 | 13.68 | 33.09 | |||||||||
1987 | 11.35 | 21.07 | a | 23.80 | a | 38.43 | 50.23 | 57.20 | 63.55 | 56.06 | 50.40 | 32.71 | 26.11 | c | 15.70 | a | 37.22 | |||||||||
1988 | -1.42 | 3.79 | a | 20.24 | b | 31.93 | a | 50.77 | e | 61.00 | a | 60.31 | e | 59.31 | b | 46.83 | f | 30.88 | g | 19.36 | b | 9.44 | f | 33.92 | c | |
1989 | 6.83 | b | -8.18 | f | 14.87 | a | 33.39 | b | 44.10 | 52.79 | a | 62.85 | d | 59.23 | a | 47.76 | a | 34.39 | c | 17.46 | d | -2.56 | f | 37.37 | b | |
1990 | 14.31 | b | 7.67 | a | 24.24 | b | 31.41 | a | 43.13 | a | 54.26 | c | 57.62 | e | 58.33 | d | 50.50 | 34.86 | b | 24.40 | 2.87 | 33.63 | ||||
1991 | 0.65 | 14.00 | a | 21.32 | 35.47 | 48.94 | 60.27 | 61.23 | a | 61.03 | 48.83 | 33.67 | a | 15.10 | 14.00 | 34.54 | ||||||||||
1992 | 10.84 | 18.11 | b | 21.45 | b | 30.87 | 45.55 | 52.30 | 54.26 | 54.00 | 47.77 | 35.13 | 21.63 | 4.90 | 33.07 | |||||||||||
1993 | -0.35 | 1.82 | 16.23 | 29.93 | a | 44.84 | 51.70 | 57.45 | 59.23 | 44.07 | 33.55 | 18.60 | 9.00 | 30.50 | ||||||||||||
1994 | -9.16 | -3.89 | 21.19 | 32.03 | 48.71 | 57.73 | 57.87 | 57.00 | 51.87 | 41.23 | e | 27.17 | 12.52 | 32.86 | ||||||||||||
1995 | 5.10 | 5.96 | 18.39 | 30.20 | 43.80 | a | 58.52 | a | 60.13 | 64.55 | 48.70 | 37.84 | 17.21 | a | 8.11 | l | 35.49 | a | ||||||||
1996 | -4.96 | d | 5.86 | 11.00 | 28.10 | 43.42 | 57.00 | a | 58.94 | 61.13 | 50.43 | 36.61 | 9.96 | e | -1.23 | a | 29.69 | |||||||||
1997 | -4.07 | c | 6.41 | a | 14.84 | 26.80 | 42.00 | 57.67 | 61.81 | 60.27 | a | 54.53 | 40.86 | b | 19.23 | 15.11 | d | 32.95 | ||||||||
1998 | 6.71 | 20.74 | a | 17.06 | 36.70 | 51.26 | 54.73 | 63.26 | 63.13 | 56.00 | 42.10 | 26.93 | 15.48 | 37.84 | ||||||||||||
1999 | 0.97 | 17.07 | 22.90 | a | 36.20 | 47.94 | 57.30 | 64.55 | 61.45 | 49.83 | 38.00 | 31.97 | 17.47 | a | 37.14 | |||||||||||
2000 | 4.37 | a | 15.83 | 25.87 | 33.77 | 48.55 | 55.21 | a | 62.55 | 61.87 | 50.17 | 41.16 | 19.76 | a | -4.10 | a | 34.58 | |||||||||
2001 | 7.03 | -4.43 | 14.13 | 32.67 | 48.77 | 57.72 | a | 64.06 | 62.84 | 52.07 | 37.45 | 33.00 | 16.70 | a | 35.17 | |||||||||||
2002 | 11.45 | b | 16.04 | 10.16 | 31.17 | 40.90 | 60.33 | 65.35 | 60.18 | c | 53.97 | 32.10 | 23.23 | 12.77 | 34.80 | |||||||||||
2003 | 3.52 | 1.26 | a | 16.97 | a | 35.23 | 45.65 | 56.24 | a | 61.35 | 62.48 | 49.63 | 39.81 | 19.83 | 15.74 | 33.98 | ||||||||||
2004 | -0.57 | a | 10.83 | 23.97 | 33.10 | 43.68 | 52.47 | 59.52 | 55.06 | 53.93 | 39.74 | 28.97 | 12.79 | b | 34.46 | |||||||||||
2005 | 3.52 | b | 12.39 | 19.19 | 37.87 | 42.41 | i | 60.33 | 62.19 | d | 58.90 | b | 54.57 | 38.55 | 25.23 | d | 10.60 | a | 34.85 | a | ||||||
2006 | 18.06 | 5.04 | 22.42 | 38.27 | 48.06 | 57.33 | 64.48 | 61.23 | 47.90 | 34.35 | 22.27 | 16.61 | 36.34 | |||||||||||||
2007 | 5.68 | 0.21 | 21.88 | e | 31.13 | 50.77 | 59.47 | 63.94 | 59.84 | 52.10 | 42.16 | 24.00 | 4.39 | 34.63 | ||||||||||||
2008 | -0.16 | 3.24 | d | 15.58 | 28.33 | 43.65 | 54.17 | f | 60.32 | c | 59.77 | a | 51.40 | 37.87 | 24.40 | -1.29 | 29.37 | a | ||||||||
2009 | -4.63 | a | 4.39 | 15.03 | 30.00 | 45.04 | c | 53.73 | 57.16 | 57.13 | 54.20 | 34.55 | 31.53 | 4.52 | 31.89 | |||||||||||
2010 | 0.35 | 1.72 | c | 25.39 | 39.97 | 46.16 | 56.83 | 60.87 | 62.55 | 47.13 | 39.90 | 21.97 | 3.03 | 33.82 | ||||||||||||
2011 | -5.65 | 0.14 | 11.32 | 29.43 | 42.45 | 54.65 | d | 65.55 | 61.47 | a | 49.17 | 42.26 | 25.37 | 16.74 | 32.74 | |||||||||||
2012 | 11.52 | 10.72 | 30.23 | 37.73 | 49.19 | 58.30 | 66.35 | 58.47 | a | 48.57 | 36.32 | 23.27 | 9.23 | 36.66 | ||||||||||||
2013 | 2.90 | 3.00 | 8.00 | b | 23.43 | 43.74 | 55.52 | a | 62.40 | a | 60.71 | 55.23 | 37.48 | 21.37 | -1.87 | 30.99 | ||||||||||
2014 | -6.97 | -5.29 | 15.03 | 29.47 | 46.29 | 57.10 | 58.45 | 60.85 | d | 51.40 | 39.39 | 14.20 | 13.87 | 31.15 | ||||||||||||
2015 | 8.26 | -0.25 | 20.81 | 34.83 | 43.19 | 57.50 | 63.03 | 59.42 | 56.60 | 41.97 | a | 30.00 | a | 17.06 | 36.04 | |||||||||||
2016 | 8.39 | 15.07 | 27.13 | 34.40 | 47.77 | 58.77 | 61.74 | 62.45 | 54.10 | 41.65 | 35.07 | 5.81 | d | 37.70 | ||||||||||||
2017 | 7.45 | 17.96 | 17.88 | e | 34.83 | 46.48 | 57.37 | 63.13 | 58.58 | 53.77 | 39.84 | 23.23 | 10.90 | 35.95 | ||||||||||||
2018 | 5.52 | -2.00 | 18.00 | 23.07 | 51.61 | 61.73 | 63.10 | 61.55 | 53.00 | 34.19 | 17.60 | 13.16 | f | 35.22 | a | |||||||||||
2019 | -2.58 | -6.04 | 12.77 | 32.77 | 43.42 | 58.00 | 63.29 | 59.10 | b | 54.70 | 34.65 | 22.63 | 11.16 | 31.99 | ||||||||||||
2020 | 4.90 | a | 7.62 | 22.58 | 30.27 | 45.77 | 60.80 | 63.00 | 61.84 | 48.47 | 32.26 | 26.70 | 15.10 | 34.94 | ||||||||||||
2021 | 13.75 | c | -1.14 | 25.61 | 32.70 | 48.80 | f | 61.13 | 64.77 | 61.33 | a | 54.80 | 43.52 | 26.90 | a | 8.84 | 35.66 | a | ||||||||
2022 | -3.29 | -1.32 | 18.29 | 28.03 | 46.52 | 59.70 | 63.77 | 61.68 | 54.63 | 38.90 | 21.63 | 3.90 | 32.70 | |||||||||||||
2023 | 5.23 | 3.89 | 8.71 | 26.73 | 49.68 | 61.47 | 60.26 | 62.19 | 56.27 | 39.19 | 26.97 | 22.32 | 35.24 | |||||||||||||
2024 | 6.23 | a | 21.42 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 13.83 | j |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 1.44 | 5.78 | 17.81 | 31.86 | 45.23 | 55.78 | 60.53 | 58.78 | 49.26 | 36.94 | 21.77 | 8.23 | 32.79 | |||||||||||||
S.D. | 6.57 | 7.34 | 5.63 | 3.64 | 3.27 | 3.13 | 2.81 | 2.69 | 3.78 | 3.40 | 5.16 | 6.88 | 2.36 | |||||||||||||
SKEW | 0.13 | 0.48 | -0.26 | -0.08 | 0.17 | -0.26 | -0.05 | -0.18 | 0.03 | 0.03 | -0.00 | -0.32 | 0.40 | |||||||||||||
MAX | 18.06 | 21.42 | 30.23 | 39.97 | 52.68 | 61.73 | 66.35 | 64.55 | 56.60 | 45.35 | 35.07 | 22.32 | 37.84 | |||||||||||||
MIN | -11.30 | -9.48 | 3.74 | 23.07 | 38.35 | 47.61 | 54.26 | 52.17 | 40.63 | 27.85 | 9.96 | -10.13 | 28.57 | |||||||||||||
YRS | 71 | 71 | 70 | 71 | 68 | 70 | 70 | 71 | 70 | 71 | 69 | 67 | 56 |