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 | 57.00 | w | 54.86 | b | 42.60 | 29.84 | 7.60 | 10.94 | 29.17 | g | ||||
1960 | -4.58 | -2.55 | 0.55 | b | 26.10 | 35.84 | 45.53 | 49.10 | b | 53.90 | b | 42.87 | 33.45 | 19.77 | -5.90 | 24.51 | ||||||||||
1961 | -9.57 | a | 5.96 | 19.29 | 23.64 | b | 35.07 | b | 48.20 | 50.96 | d | 51.62 | b | 43.33 | 32.93 | b | 15.66 | a | -0.93 | b | 26.35 | |||||
1962 | -13.97 | -9.25 | 13.48 | 22.79 | b | 42.43 | a | 53.50 | f | 52.79 | c | 51.97 | a | 40.63 | 35.06 | 24.83 | a | 1.68 | 23.86 | a | ||||||
1963 | -12.52 | -9.37 | a | 12.66 | b | 28.80 | 37.97 | 54.17 | 56.66 | b | 51.97 | a | 45.30 | 41.00 | 20.60 | -8.00 | c | 26.60 | ||||||||
1964 | -1.13 | a | -3.07 | 1.55 | 27.41 | a | 42.20 | a | 47.83 | a | 55.19 | 48.23 | a | 39.57 | 32.33 | a | 18.18 | b | -6.26 | 25.17 | ||||||
1965 | -14.14 | b | -8.61 | -1.35 | 29.76 | e | 40.03 | a | 48.67 | c | 51.86 | b | 48.90 | b | 37.63 | 34.03 | a | 13.83 | 9.10 | b | 24.14 | |||||
1966 | -21.19 | d | -11.36 | 14.52 | b | 24.89 | c | 34.82 | c | 50.62 | d | 56.92 | e | 51.13 | a | 40.96 | b | 30.55 | b | 10.38 | a | -1.77 | 23.37 | |||
1967 | -6.57 | a | -15.39 | 9.90 | 25.28 | a | 32.90 | 48.14 | a | 51.52 | b | 47.74 | 43.00 | 31.26 | 17.17 | a | ----- | z | 25.90 | a | ||||||
1968 | -8.97 | -10.00 | a | 15.00 | 27.47 | 36.45 | 48.76 | a | 50.23 | a | 49.97 | a | 43.40 | 33.29 | 20.27 | -1.29 | 25.38 | |||||||||
1969 | -12.26 | -0.75 | 0.93 | a | 29.23 | 38.81 | 41.55 | a | 51.87 | a | 54.45 | 43.83 | 30.07 | a | 18.13 | 5.65 | 25.13 | |||||||||
1970 | -12.52 | -11.04 | b | -1.74 | 25.10 | a | 38.10 | 51.70 | 55.50 | a | 49.13 | a | 42.67 | 33.68 | 14.79 | a | -9.28 | b | 23.01 | |||||||
1971 | -19.84 | -5.00 | 9.75 | c | 27.03 | a | 35.14 | b | 51.30 | 48.30 | a | 50.07 | a | 42.17 | 35.30 | a | 16.69 | d | -2.83 | b | 24.01 | |||||
1972 | -18.17 | a | -12.71 | a | 7.23 | 24.21 | a | 44.43 | a | 44.96 | e | 49.17 | a | 51.23 | 37.90 | 29.97 | ----- | z | ----- | z | 25.82 | b | ||||
1973 | -1.61 | 1.86 | 24.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.05 | j | 15.17 | -1.94 | 7.67 | g | |||||
1974 | -15.93 | a | -10.79 | 3.68 | 27.20 | 35.77 | 46.27 | 54.39 | 47.68 | 34.40 | 27.81 | o | ----- | z | ----- | z | 24.74 | c | ||||||||
1975 | -5.40 | f | -6.23 | b | 1.42 | 22.66 | a | 39.48 | d | 44.57 | 56.23 | 46.30 | u | 38.50 | j | 33.38 | b | 18.27 | -1.84 | 23.10 | c | |||||
1976 | -10.63 | a | 5.76 | 3.67 | a | 29.63 | 28.08 | s | 49.30 | 51.61 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.56 | f | ||||
1977 | -19.87 | 0.71 | 19.83 | b | 30.00 | i | 48.54 | g | 50.15 | q | ----- | z | 46.47 | p | 40.00 | g | 27.65 | k | 7.77 | h | -9.43 | h | 0.22 | i | ||
1978 | -14.04 | f | -10.00 | b | 7.65 | 27.39 | b | 41.91 | h | 45.24 | e | 57.07 | a | 53.48 | 45.20 | 30.55 | 8.77 | -10.87 | 25.45 | b | ||||||
1979 | -22.23 | -13.54 | 10.00 | e | 22.90 | ----- | z | 46.60 | j | 51.94 | 43.68 | 39.27 | 27.32 | 13.30 | 7.20 | a | 17.98 | b | ||||||||
1980 | -10.61 | -6.41 | g | 3.52 | 29.04 | b | 41.23 | 43.30 | 50.37 | d | 47.58 | 38.40 | 28.87 | 20.56 | e | -7.20 | a | 25.91 | a | |||||||
1981 | -5.87 | 5.54 | 19.65 | 30.23 | 37.65 | 45.97 | 51.14 | j | 49.32 | 39.13 | 28.11 | d | 24.77 | -3.32 | 24.65 | a | ||||||||||
1982 | ----- | z | ----- | z | 8.87 | 23.77 | 42.84 | ----- | z | ----- | z | 55.74 | 43.20 | 36.96 | e | 13.97 | a | 11.64 | c | 29.62 | d | |||||
1983 | 1.48 | b | 10.59 | a | 20.07 | c | 28.93 | 36.20 | a | 51.83 | 60.00 | d | 55.29 | g | 43.17 | 31.81 | 22.17 | a | -14.24 | b | 26.55 | a | ||||
1984 | -9.07 | a | 11.56 | b | 7.35 | 30.72 | a | 33.77 | 50.47 | 48.74 | 56.90 | 39.57 | 36.42 | 18.87 | -2.71 | 26.88 | ||||||||||
1985 | -7.97 | -7.46 | 17.84 | 32.67 | 44.57 | a | 44.13 | 50.69 | e | 50.44 | f | 40.74 | c | 31.04 | e | 6.80 | -10.71 | 22.03 | a | |||||||
1986 | 1.64 | i | -4.00 | b | 16.77 | a | 30.07 | c | 42.92 | e | 45.63 | k | 57.54 | c | 48.55 | 42.30 | 32.06 | 9.29 | b | 8.73 | a | 28.42 | b | |||
1987 | 2.41 | b | 16.08 | b | 20.69 | b | 33.60 | 42.38 | e | 49.87 | 56.61 | 50.06 | 43.87 | 28.90 | 21.00 | c | 11.19 | 31.39 | ||||||||
1988 | -10.31 | b | -9.28 | 14.13 | a | 26.97 | 44.94 | 56.07 | 56.48 | 55.74 | 42.73 | ----- | z | 19.23 | q | -0.15 | d | 27.73 | b | |||||||
1989 | -4.21 | b | -15.19 | a | 7.65 | 26.60 | 40.35 | 45.77 | 58.55 | 51.58 | 38.79 | p | 29.43 | a | 11.48 | a | -11.14 | b | 21.90 | a | ||||||
1990 | 4.61 | -1.54 | 17.68 | 27.33 | 37.74 | 50.25 | b | 52.90 | 52.16 | 43.30 | 30.26 | 18.86 | b | -4.45 | 27.43 | |||||||||||
1991 | -12.13 | a | 4.32 | 15.27 | a | 32.03 | 44.40 | f | 54.52 | a | 55.26 | 53.55 | 42.67 | 28.61 | 10.72 | a | 4.63 | a | 26.31 | a | ||||||
1992 | 4.26 | 10.66 | 16.80 | a | 27.77 | 40.77 | a | 47.77 | 47.50 | c | 48.45 | 41.97 | 29.74 | 19.54 | b | -1.75 | c | 27.79 | ||||||||
1993 | -6.38 | b | -3.00 | 14.71 | 28.07 | 39.23 | 45.80 | 51.82 | n | 52.26 | 39.14 | a | 28.00 | 14.83 | a | 5.32 | 23.45 | a | ||||||||
1994 | -18.33 | d | -7.15 | a | 18.97 | b | 26.72 | a | 38.30 | h | 53.93 | 53.85 | d | 50.72 | b | 46.21 | a | 38.13 | a | 23.93 | 11.10 | 27.10 | a | |||
1995 | -3.15 | d | -6.44 | a | 16.77 | a | 24.70 | 37.03 | 55.77 | 53.79 | c | 53.71 | 38.04 | e | 32.83 | h | 7.41 | a | -4.79 | c | 24.80 | a | ||||
1996 | -18.28 | b | -2.82 | a | 2.39 | 20.87 | 37.97 | a | 49.47 | 51.81 | 53.32 | 44.17 | 32.53 | a | 6.79 | b | -2.70 | a | 22.96 | |||||||
1997 | -9.03 | b | 0.64 | 9.19 | 24.79 | a | 35.65 | 53.07 | 55.87 | 51.06 | 44.64 | b | 33.74 | 14.93 | a | 13.87 | 27.37 | |||||||||
1998 | 2.50 | a | 20.41 | a | 14.97 | 30.47 | 42.92 | g | 48.23 | 54.19 | d | 56.39 | 45.55 | a | 35.90 | 21.07 | b | 2.97 | 30.24 | a | ||||||
1999 | -6.10 | b | 8.75 | 17.81 | 31.86 | a | 43.97 | 52.82 | m | 56.00 | 52.70 | a | 43.57 | 30.52 | 24.60 | 8.31 | b | 28.36 | a | |||||||
2000 | -5.21 | b | 8.76 | 21.97 | 28.57 | 40.58 | 48.03 | 55.52 | b | 52.97 | 41.90 | 33.39 | 20.48 | a | -11.13 | a | 27.99 | |||||||||
2001 | 4.79 | b | -7.11 | a | 15.44 | d | 30.90 | a | 42.13 | 44.73 | h | 56.38 | w | 56.39 | 44.53 | 31.68 | 28.40 | 11.48 | b | 25.86 | b | |||||
2002 | 5.37 | a | 9.86 | 6.07 | a | 27.37 | 33.03 | 53.73 | 58.42 | 53.16 | 46.77 | 25.58 | 15.60 | 10.00 | 28.75 | |||||||||||
2003 | -4.42 | -9.04 | a | 9.81 | 28.30 | 39.68 | 49.63 | 53.90 | a | ----- | z | 45.30 | 32.92 | f | 15.13 | 10.19 | 23.85 | b | ||||||||
2004 | -11.80 | a | 4.70 | b | 13.28 | b | 26.43 | 35.27 | a | 44.53 | 52.26 | 47.35 | 50.24 | a | 35.90 | 23.57 | 2.97 | 27.06 | ||||||||
2005 | -8.97 | a | 4.32 | 10.27 | a | 34.57 | 39.74 | 54.37 | 56.16 | 53.87 | 47.27 | 35.23 | 20.86 | a | 8.42 | 29.68 | ||||||||||
2006 | 14.97 | a | -5.04 | 19.06 | 34.13 | 43.35 | 49.47 | 59.32 | 51.03 | 43.50 | 29.53 | a | 19.47 | 10.32 | 30.76 | |||||||||||
2007 | 0.77 | a | -7.61 | 17.69 | b | 23.97 | 44.10 | a | 55.45 | a | 58.77 | 52.26 | 45.80 | 35.94 | 18.41 | c | -1.24 | b | 28.69 | |||||||
2008 | -6.83 | b | -8.62 | c | 11.37 | a | 26.48 | g | 32.97 | 47.03 | 52.71 | 52.45 | ----- | z | 34.52 | 19.71 | b | -9.42 | e | 22.59 | b | |||||
2009 | -13.93 | a | -0.07 | 13.39 | 29.87 | ----- | z | 48.47 | 50.83 | a | 51.45 | 50.47 | 32.45 | 27.00 | 1.23 | a | 26.47 | a | ||||||||
2010 | -2.41 | d | -3.00 | 24.97 | a | 32.50 | 44.84 | 51.30 | 57.26 | 56.26 | 41.87 | 36.65 | 18.50 | 0.89 | c | 29.97 | ||||||||||
2011 | -9.23 | a | -0.54 | 12.24 | b | 31.27 | 40.90 | 49.53 | 58.13 | 54.90 | 41.30 | 37.39 | 21.93 | a | 12.27 | a | 29.17 | |||||||||
2012 | 5.30 | a | 9.00 | 27.65 | 31.14 | a | 42.37 | a | 51.71 | f | 58.03 | 50.29 | 40.03 | 31.57 | a | 19.00 | 2.97 | 28.85 | a | |||||||
2013 | -3.65 | -2.07 | 6.52 | 21.37 | 39.00 | 48.97 | 54.97 | 53.52 | 48.47 | 33.29 | 14.47 | -11.64 | c | 25.27 | ||||||||||||
2014 | -15.58 | -12.74 | e | -0.75 | c | 25.25 | b | 42.28 | b | 53.46 | b | 53.16 | 55.70 | a | 47.03 | a | 35.07 | a | 11.47 | 12.90 | b | 25.60 | ||||
2015 | 0.10 | -9.11 | 19.34 | b | 29.86 | b | 40.61 | c | 52.41 | a | 58.67 | d | 53.46 | c | 50.62 | f | 35.36 | c | 26.10 | 15.42 | 29.29 | a | ||||
2016 | 1.55 | 7.93 | b | 23.41 | d | 29.53 | 43.04 | c | 52.19 | c | 56.87 | 56.48 | b | 51.80 | o | 36.45 | 31.53 | 3.79 | c | 31.16 | a | |||||
2017 | 1.43 | a | 9.14 | 15.00 | 30.57 | 40.69 | b | 51.86 | a | 55.48 | 51.77 | 49.62 | d | 34.80 | a | 15.30 | -0.71 | 29.58 | ||||||||
2018 | -2.50 | c | -6.50 | 17.45 | b | 21.83 | 43.30 | d | 54.23 | 56.23 | a | 53.83 | a | 45.70 | 31.68 | 13.17 | 9.52 | 28.16 | ||||||||
2019 | -8.76 | b | -6.79 | 9.55 | 29.43 | 38.03 | 48.77 | 55.87 | 53.03 | a | 48.47 | 34.23 | 16.93 | 3.84 | 26.88 | |||||||||||
2020 | 1.70 | a | -0.90 | 15.97 | 26.63 | 38.90 | 53.60 | 58.16 | 54.84 | 43.27 | 27.00 | 20.47 | 10.65 | 29.19 | ||||||||||||
2021 | 8.38 | b | -8.07 | 21.97 | 28.79 | a | 40.65 | 53.63 | 57.13 | 56.26 | 49.23 | 40.68 | 21.20 | 4.52 | 31.20 | |||||||||||
2022 | -11.84 | -13.57 | 12.63 | a | 25.60 | 44.33 | a | 52.63 | 57.94 | 56.13 | 47.86 | a | 35.16 | 19.77 | 1.84 | 27.37 | ||||||||||
2023 | 3.97 | -2.93 | 7.71 | 26.07 | 46.68 | 56.37 | 52.29 | 54.45 | 50.90 | 36.35 | 21.23 | 21.39 | 31.21 | |||||||||||||
2024 | 5.23 | 15.59 | 16.70 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 12.51 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -6.29 | -2.03 | 12.66 | 27.75 | 39.73 | 49.87 | 54.47 | 52.27 | 43.45 | 32.84 | 17.74 | 1.98 | 27.21 | |||||||||||||
S.D. | 8.24 | 8.55 | 7.08 | 3.22 | 3.52 | 3.62 | 3.15 | 2.87 | 3.54 | 3.31 | 5.45 | 8.15 | 2.45 | |||||||||||||
SKEW | 0.13 | 0.59 | -0.24 | -0.06 | -0.21 | -0.13 | -0.34 | -0.48 | 0.07 | 0.14 | -0.07 | -0.02 | -0.02 | |||||||||||||
MAX | 14.97 | 20.41 | 27.65 | 34.57 | 46.68 | 56.37 | 60.00 | 56.90 | 50.90 | 41.00 | 31.53 | 21.39 | 31.39 | |||||||||||||
MIN | -22.23 | -15.39 | -1.74 | 20.87 | 32.90 | 41.55 | 47.50 | 43.68 | 34.40 | 25.58 | 6.79 | -14.24 | 22.96 | |||||||||||||
YRS | 61 | 63 | 65 | 61 | 55 | 55 | 58 | 58 | 57 | 58 | 60 | 60 | 33 |