YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.48 | h | 45.12 | d | 34.33 | a | 24.13 | -9.77 | 23.45 | h | ||
1984 | -4.13 | 13.93 | 6.97 | 30.77 | 35.94 | 50.72 | a | 50.13 | 55.26 | 40.17 | 38.00 | b | 19.52 | a | 5.07 | a | 28.53 | |||||||||
1985 | -8.43 | c | -4.74 | a | 18.35 | 33.23 | 43.35 | 43.67 | 50.72 | b | 48.81 | d | 43.50 | b | 29.17 | b | 12.03 | -12.03 | a | 24.80 | ||||||
1986 | -4.30 | a | -7.00 | a | 14.29 | c | 35.28 | a | 43.58 | 46.97 | 55.14 | b | 48.16 | 43.88 | f | 32.10 | 17.07 | c | 10.12 | e | 26.49 | a | ||||
1987 | 2.83 | b | 10.80 | c | 20.33 | d | 29.67 | f | 41.33 | d | 50.62 | a | ----- | z | 48.86 | b | 40.25 | b | 22.54 | c | 18.52 | c | 9.68 | 26.58 | b | |
1988 | -10.04 | e | -9.35 | c | 15.04 | c | 28.11 | c | 42.25 | c | 48.84 | e | 53.75 | c | 54.53 | a | 41.96 | b | 24.77 | 23.67 | 0.29 | 26.15 | ||||
1989 | -1.68 | -13.27 | b | 8.73 | a | 26.04 | d | 39.35 | 46.90 | a | 55.47 | a | 51.14 | b | 39.90 | 30.74 | 13.67 | -9.19 | 23.98 | |||||||
1990 | 3.81 | -3.86 | 14.58 | 28.50 | 36.71 | 49.93 | 52.52 | 50.84 | 45.20 | 29.03 | 22.24 | a | 3.81 | 27.78 | ||||||||||||
1991 | -7.48 | 1.41 | a | 15.37 | a | 31.20 | 46.68 | 53.20 | 54.07 | a | 52.26 | 41.55 | a | 27.74 | 13.21 | a | 2.23 | 27.62 | ||||||||
1992 | 4.39 | 11.17 | 12.77 | 26.62 | a | 38.29 | 44.73 | 46.42 | 46.20 | a | 39.54 | b | 28.87 | 20.73 | 5.29 | 27.09 | ||||||||||
1993 | -7.81 | -1.46 | 8.06 | 22.33 | 37.23 | 44.70 | 51.65 | 49.94 | 32.97 | a | 24.61 | 14.03 | 7.21 | c | 23.62 | |||||||||||
1994 | -16.68 | -7.18 | 15.20 | a | 25.97 | 36.69 | b | 50.00 | e | 51.64 | f | 49.25 | c | 45.56 | e | 34.73 | e | 21.88 | f | 8.25 | g | 25.95 | c | |||
1995 | 0.58 | g | -4.21 | d | 12.30 | d | 21.82 | h | 34.50 | i | 50.89 | k | 56.60 | k | 56.77 | i | 39.15 | j | 33.09 | i | 9.10 | j | -3.79 | l | 4.04 | j |
1996 | -16.74 | h | -6.95 | j | 3.24 | j | 22.38 | i | 37.14 | j | 50.44 | l | 51.00 | i | 51.10 | j | 43.84 | k | 29.68 | i | 9.78 | l | 1.50 | k | ----- | z |
1997 | -6.38 | j | 5.35 | h | 9.32 | l | 21.68 | h | 31.24 | j | 48.24 | i | 51.19 | j | 46.95 | k | 43.10 | i | 32.23 | i | 14.50 | l | 15.48 | j | ----- | z |
1998 | 6.71 | j | 18.35 | h | 15.33 | j | 31.65 | j | 42.63 | l | 47.14 | i | 52.36 | i | 51.67 | j | 41.27 | h | 30.76 | j | 21.00 | k | 5.60 | k | ----- | z |
1999 | -11.21 | l | 7.40 | h | 10.70 | h | 28.81 | i | 39.45 | k | 45.50 | h | 54.36 | i | 48.36 | i | 37.86 | i | 25.50 | k | 19.95 | k | 8.32 | l | ----- | z |
2000 | -6.29 | j | 6.81 | h | 22.82 | i | 27.29 | m | 41.50 | i | 47.68 | h | 53.75 | k | 51.96 | h | 38.70 | j | 33.23 | i | 22.90 | j | -9.68 | l | ----- | z |
2001 | 0.14 | i | -9.26 | i | 7.10 | k | 26.79 | k | 41.05 | j | 49.65 | j | 50.00 | l | 51.77 | i | 38.61 | l | 28.59 | i | 27.60 | j | 13.50 | k | ----- | z |
2002 | 5.62 | j | 5.80 | h | 1.11 | m | 27.18 | h | 35.33 | j | 51.44 | n | 56.74 | l | 49.76 | j | 43.00 | j | 25.33 | j | 14.76 | m | 6.63 | l | ----- | z |
2003 | -6.33 | j | -12.85 | h | 6.21 | l | 22.95 | i | 34.29 | j | 44.11 | k | 47.00 | j | 50.05 | j | 38.05 | i | 26.30 | h | 20.00 | l | 9.55 | k | ----- | z |
2004 | -7.40 | k | 0.00 | j | 15.90 | j | 27.85 | j | 34.94 | m | 45.36 | h | 52.62 | j | 45.60 | k | 44.52 | i | 32.05 | k | 22.47 | k | 2.94 | n | ----- | z |
2005 | -2.90 | k | 2.75 | h | 3.55 | i | 31.63 | k | 37.47 | l | 51.40 | j | 53.00 | k | 50.43 | h | 40.95 | i | 31.52 | j | 20.07 | o | 2.33 | p | ----- | z |
2006 | 9.50 | k | -6.05 | h | 12.70 | k | 29.61 | l | 42.48 | b | 51.00 | a | 58.23 | 55.84 | 42.76 | a | 31.03 | a | 26.29 | b | 16.79 | b | 40.55 | d | ||
2007 | 7.16 | -3.30 | a | 19.87 | a | 28.93 | c | 45.45 | 53.83 | 55.84 | 55.77 | 48.53 | 41.61 | 23.45 | a | 3.23 | a | 31.70 | ||||||||
2008 | 0.47 | a | -3.70 | b | 9.48 | 30.23 | 37.79 | c | 52.40 | 56.90 | a | 53.10 | 47.93 | 35.87 | 24.25 | b | -1.03 | 28.64 | ||||||||
2009 | -11.47 | a | 5.18 | 17.19 | e | 31.00 | j | 42.06 | 50.63 | 51.16 | 53.42 | 50.27 | 33.74 | 29.20 | 7.61 | 29.91 | a | |||||||||
2010 | 3.70 | a | 2.96 | 22.68 | 36.87 | 45.74 | 55.10 | 61.06 | 60.13 | 44.83 | 36.87 | 24.50 | 7.97 | 33.53 | ||||||||||||
2011 | -1.23 | 2.46 | 12.23 | 29.87 | 42.84 | 51.77 | 61.81 | 56.03 | 47.57 | 39.26 | 28.80 | 16.00 | 32.28 | |||||||||||||
2012 | 8.29 | 13.48 | 31.74 | 34.07 | 46.87 | 54.57 | 61.55 | 53.87 | 43.23 | 33.90 | 24.00 | 14.87 | 35.04 | |||||||||||||
2013 | 1.00 | 0.74 | a | 8.07 | a | 25.53 | 42.74 | 54.50 | 58.71 | 55.23 | 48.07 | 36.90 | 21.67 | -1.10 | 29.34 | |||||||||||
2014 | -10.32 | -10.54 | 7.13 | 27.83 | 46.10 | 56.60 | 56.50 | a | 57.65 | 47.23 | 36.77 | 15.93 | 15.35 | 28.85 | ||||||||||||
2015 | 2.61 | -8.18 | 17.77 | 33.30 | 45.19 | 54.47 | 57.97 | 55.84 | 54.33 | 37.06 | 28.37 | 24.90 | 33.64 | |||||||||||||
2016 | 3.48 | 8.24 | 27.35 | 34.20 | 44.84 | 55.63 | 59.77 | 59.19 | 53.43 | 40.42 | 32.20 | 10.97 | 35.81 | |||||||||||||
2017 | 6.39 | 13.82 | 18.03 | 34.80 | 43.58 | 54.20 | 57.84 | 54.29 | 51.57 | 39.32 | 20.87 | 5.74 | 33.37 | |||||||||||||
2018 | -0.16 | -5.79 | 15.74 | 18.70 | 50.03 | 57.77 | 58.58 | 58.26 | 52.90 | 34.81 | 20.13 | 16.06 | 31.42 | |||||||||||||
2019 | 2.97 | -2.89 | 8.13 | 31.07 | 41.23 | 52.17 | 60.61 | 54.48 | 52.57 | 36.39 | 20.23 | 8.74 | 30.47 | |||||||||||||
2020 | 10.32 | 1.64 | a | 23.52 | 29.63 | 45.74 | 55.60 | 63.58 | 60.19 | 46.37 | 32.06 | 28.10 | 14.10 | 34.24 | ||||||||||||
2021 | 9.58 | -4.54 | 23.94 | 33.90 | 44.23 | 57.70 | 58.13 | 58.16 | 49.23 | 43.19 | 24.07 | a | 11.48 | 34.09 | ||||||||||||
2022 | -8.67 | a | -5.57 | 15.32 | 28.27 | 46.29 | 52.70 | 57.87 | 57.32 | 49.10 | 36.13 | 24.70 | 7.43 | a | 30.07 | |||||||||||
2023 | 13.39 | 4.54 | 13.10 | 30.03 | 46.19 | 55.37 | 56.00 | 56.81 | 53.47 | 40.87 | 22.83 | 23.87 | 34.71 | |||||||||||||
2024 | 13.68 | 16.93 | 20.46 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.02 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.06 | 0.39 | 15.79 | 29.82 | 42.79 | 51.94 | 56.37 | 54.17 | 46.18 | 34.10 | 22.01 | 7.44 | 30.28 | |||||||||||||
S.D. | 7.86 | 8.19 | 6.17 | 4.17 | 3.64 | 3.85 | 4.08 | 3.77 | 5.13 | 5.24 | 5.12 | 8.93 | 3.64 | |||||||||||||
SKEW | -0.18 | 0.48 | 0.56 | -0.61 | -0.36 | -0.57 | -0.46 | -0.33 | -0.36 | -0.42 | -0.22 | -0.29 | -0.25 | |||||||||||||
MAX | 13.68 | 16.93 | 31.74 | 36.87 | 50.03 | 57.77 | 63.58 | 60.19 | 54.33 | 43.19 | 32.20 | 24.90 | 35.81 | |||||||||||||
MIN | -16.68 | -13.27 | 6.97 | 18.70 | 35.94 | 43.67 | 46.42 | 46.20 | 32.97 | 22.54 | 12.03 | -12.03 | 23.62 | |||||||||||||
YRS | 29 | 30 | 30 | 26 | 29 | 29 | 27 | 29 | 29 | 30 | 29 | 29 | 24 |