YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 4.73 | a | 4.73 | k |
1974 | -4.29 | 2.64 | 16.77 | 32.53 | 42.74 | 52.00 | 62.03 | 53.35 | 40.17 | 34.47 | a | 22.43 | 12.74 | 30.63 | ||||||||||||
1975 | 1.87 | -0.21 | 7.63 | a | 29.00 | 43.55 | 53.90 | 62.10 | 57.29 | 43.97 | 37.06 | 22.20 | 7.71 | 30.51 | ||||||||||||
1976 | ----- | z | 15.07 | 16.81 | 34.33 | 40.03 | 55.50 | 57.77 | 59.00 | 44.45 | a | 28.74 | 14.60 | 0.52 | 33.35 | a | ||||||||||
1977 | -11.84 | 12.46 | 23.00 | 39.73 | 53.97 | 56.33 | 61.39 | 52.65 | 49.07 | 35.84 | ----- | z | 5.06 | 34.33 | a | |||||||||||
1978 | -9.19 | -2.33 | a | 15.87 | 33.37 | 47.13 | 53.63 | 60.61 | 58.77 | 52.07 | a | 34.26 | 16.63 | 4.55 | 30.45 | |||||||||||
1979 | -10.52 | -8.04 | 13.06 | 29.20 | 39.94 | 53.67 | 60.13 | 54.35 | 50.00 | 33.68 | 19.80 | 13.61 | 29.07 | |||||||||||||
1980 | 4.13 | 5.41 | 14.84 | 36.33 | 46.13 | a | 56.83 | 60.32 | 58.97 | 48.57 | 35.39 | 26.70 | 8.12 | o | 35.78 | a | ||||||||||
1981 | 3.81 | 13.82 | 23.97 | 38.27 | 45.39 | 56.20 | 62.13 | 60.32 | 47.53 | 38.23 | 27.07 | 5.32 | 35.17 | |||||||||||||
1982 | -13.61 | c | 2.28 | c | 19.80 | a | 31.23 | 50.10 | 49.17 | 62.74 | 58.07 | a | 48.60 | 38.26 | 19.70 | 15.62 | b | 31.83 | ||||||||
1983 | 10.17 | b | 16.62 | b | 26.07 | a | 30.37 | 40.16 | 55.37 | 65.71 | 64.90 | 50.33 | 39.03 | 26.57 | b | -7.55 | b | 34.81 | ||||||||
1984 | 7.23 | a | 20.66 | 14.61 | 34.90 | 43.74 | 57.50 | 60.29 | 60.84 | 44.23 | 40.52 | 22.00 | a | 3.69 | e | 34.18 | ||||||||||
1985 | -2.21 | c | 4.04 | a | 25.84 | 36.00 | a | 49.13 | 50.62 | a | 59.00 | 55.68 | 48.53 | 34.00 | a | 11.03 | -3.41 | b | 30.69 | |||||||
1986 | 10.21 | b | 3.50 | b | 25.24 | b | 36.17 | a | 47.03 | 58.07 | 62.48 | 55.45 | 49.30 | 36.47 | a | 17.62 | a | 14.93 | b | 34.71 | ||||||
1987 | 12.38 | b | 21.86 | 24.53 | a | 36.72 | a | 49.97 | b | 57.40 | 63.87 | 56.00 | 49.70 | 33.48 | 25.33 | c | 17.41 | d | 37.39 | |||||||
1988 | -1.56 | d | 4.11 | a | 22.67 | a | 31.60 | 50.81 | 60.28 | a | 63.97 | 60.10 | 47.82 | b | 32.71 | 22.69 | a | 9.54 | c | 33.73 | ||||||
1989 | 7.82 | c | -3.16 | c | 18.33 | d | 33.59 | a | 45.60 | a | 52.72 | a | 62.52 | 59.26 | 48.66 | a | 33.00 | a | 18.57 | b | -1.37 | d | 31.29 | |||
1990 | 15.90 | a | 10.50 | b | 23.52 | 31.43 | 43.81 | 56.00 | 57.32 | 57.37 | a | 49.17 | 31.53 | a | 22.79 | a | 3.32 | 33.56 | ||||||||
1991 | -0.80 | a | 11.57 | 19.71 | 35.77 | 50.87 | 60.17 | a | 60.35 | 60.19 | 46.17 | 32.32 | 17.04 | c | 11.87 | 33.77 | ||||||||||
1992 | 10.48 | 18.07 | a | 24.35 | 29.83 | 45.45 | b | 51.97 | 53.75 | g | 52.06 | 42.12 | m | 32.26 | 23.72 | e | 4.04 | g | 32.02 | c | ||||||
1993 | -2.04 | h | 5.11 | i | 18.05 | k | 30.43 | g | 43.29 | g | 52.71 | f | 58.93 | d | 57.57 | h | 42.58 | k | 31.10 | j | 16.42 | k | 6.77 | i | 58.93 | k |
1994 | -10.96 | h | -4.94 | j | 24.13 | h | 31.79 | f | 48.12 | e | 55.74 | g | 58.37 | d | 55.58 | g | 49.33 | l | 40.00 | h | 25.55 | j | 11.56 | m | 53.24 | j |
1995 | 0.78 | m | 6.39 | e | 19.00 | i | 31.33 | f | 44.30 | h | 58.83 | a | 60.00 | g | 60.17 | m | 44.60 | j | 36.73 | i | 17.85 | j | 6.10 | k | 32.61 | j |
1996 | -8.39 | h | 5.47 | j | 13.42 | g | 28.29 | i | 43.39 | h | 56.80 | e | 58.36 | c | 56.87 | h | 47.43 | i | 34.22 | m | 11.14 | h | -0.74 | h | 57.58 | j |
1997 | -6.64 | i | 8.52 | g | 15.25 | g | 28.88 | f | 41.21 | g | 56.67 | c | 61.00 | f | 56.45 | i | 47.95 | j | 36.18 | i | 19.35 | g | 19.83 | h | 56.67 | k |
1998 | 4.68 | i | 20.59 | f | 21.25 | g | ----- | z | 49.50 | e | 54.40 | e | 61.42 | 60.09 | h | 50.25 | j | 39.26 | l | 26.95 | h | 12.00 | g | 55.11 | i | |
1999 | -1.14 | i | 16.50 | h | 22.50 | g | 33.71 | b | 45.61 | 54.28 | a | 61.61 | 56.74 | 45.73 | 32.89 | c | 25.23 | 13.20 | a | 41.00 | c | |||||
2000 | 0.55 | 13.07 | a | 24.90 | 30.00 | 46.62 | b | 52.77 | 59.97 | 56.35 | 43.38 | a | 37.39 | 20.14 | a | -4.77 | a | 31.70 | ||||||||
2001 | 8.33 | a | -7.21 | 14.20 | a | 32.87 | 47.33 | a | 56.03 | 61.03 | b | 57.93 | a | 46.72 | a | 33.65 | 30.43 | 14.77 | 33.01 | |||||||
2002 | 8.93 | c | 15.41 | a | 9.39 | 29.45 | a | 38.45 | 58.20 | 61.90 | 57.58 | 49.60 | 31.00 | a | 21.47 | 12.23 | a | 32.80 | ||||||||
2003 | 2.35 | 0.50 | 13.42 | 32.13 | 41.65 | 53.14 | b | 58.93 | b | 57.45 | b | 41.66 | a | 33.86 | c | 19.14 | a | 11.92 | g | 32.20 | a | |||||
2004 | -1.33 | a | 8.39 | a | 21.55 | b | 29.93 | 40.39 | c | 49.36 | b | 55.04 | e | 49.33 | a | 48.33 | c | 36.16 | 21.48 | a | 12.26 | d | 30.91 | |||
2005 | -2.03 | b | 11.57 | 17.03 | a | 33.77 | 43.27 | a | 58.93 | 60.03 | b | 55.60 | a | 48.77 | d | 34.48 | 23.76 | e | 10.23 | 32.95 | ||||||
2006 | 16.55 | 4.04 | 21.97 | a | 36.27 | 45.60 | a | 53.39 | b | 61.84 | l | 56.84 | f | 45.33 | c | 31.04 | c | 17.85 | d | 14.19 | 28.62 | b | ||||
2007 | 6.93 | a | -0.14 | 21.84 | 29.23 | 46.32 | c | 57.38 | d | 59.19 | e | 54.73 | a | 46.23 | h | 38.20 | f | 21.56 | e | 0.96 | e | 29.80 | b | |||
2008 | -5.11 | d | -2.32 | a | 13.07 | a | 27.72 | e | 38.78 | m | 52.68 | b | 58.36 | i | 56.50 | c | 45.71 | b | 34.70 | a | 22.21 | a | -3.00 | a | 24.22 | b |
2009 | -9.28 | b | 2.54 | 10.48 | d | 29.67 | 40.64 | c | 51.32 | e | 54.89 | c | 51.59 | d | 50.24 | a | 33.03 | 27.67 | c | 4.03 | b | 28.90 | ||||
2010 | -0.06 | -0.50 | 23.42 | 36.07 | a | 43.55 | 55.13 | 58.77 | 59.89 | d | 44.97 | 35.93 | a | 19.43 | 3.61 | 31.68 | ||||||||||
2011 | -5.13 | -0.15 | b | 9.70 | a | 32.73 | 41.94 | 54.17 | 64.17 | b | 56.97 | 43.83 | 36.87 | 20.21 | a | 14.83 | a | 30.84 | ||||||||
2012 | 8.27 | a | 10.24 | 25.40 | a | 34.17 | 46.50 | a | 54.75 | f | 63.94 | 51.52 | b | 40.00 | b | 31.71 | 21.30 | c | 6.66 | b | 30.88 | a | ||||
2013 | -0.74 | h | 4.41 | f | 6.07 | a | 23.23 | 41.85 | k | 55.74 | k | 58.72 | b | 57.39 | m | 46.96 | b | 38.36 | t | 16.85 | c | -0.94 | 25.15 | f | ||
2014 | -5.57 | a | -3.46 | 15.07 | b | 26.83 | a | 44.05 | j | 56.29 | f | 56.69 | e | 58.27 | p | 47.93 | 35.13 | 13.03 | 14.10 | 22.19 | c | |||||
2015 | 8.10 | -2.50 | 18.94 | 30.77 | 41.71 | 53.93 | 58.16 | 55.29 | 52.03 | 36.48 | 27.21 | a | 14.90 | 32.92 | ||||||||||||
2016 | 6.10 | a | 15.55 | 25.94 | 32.13 | 42.90 | 53.97 | 58.10 | a | 57.26 | 50.57 | 36.23 | 30.70 | 7.77 | 34.77 | |||||||||||
2017 | 5.45 | 16.04 | 17.52 | 31.97 | 42.35 | 51.60 | 57.29 | 53.42 | 50.37 | 34.68 | 19.37 | 8.55 | 32.38 | |||||||||||||
2018 | 3.13 | -3.93 | 18.77 | 21.86 | a | 48.10 | 57.93 | a | 59.45 | 55.80 | a | 48.90 | 30.48 | 15.63 | 13.48 | 30.80 | ||||||||||
2019 | -2.81 | -6.89 | 11.70 | a | 31.17 | 39.84 | 53.45 | a | 60.35 | 55.47 | a | 50.34 | a | 31.73 | a | 19.20 | 8.94 | 29.37 | ||||||||
2020 | 4.65 | 6.66 | 20.94 | 26.10 | 42.16 | 57.20 | 60.55 | 58.19 | 45.03 | 28.84 | 22.97 | 12.16 | 32.12 | |||||||||||||
2021 | 12.61 | -2.86 | 23.45 | 29.50 | 42.16 | 54.70 | 60.35 | 57.74 | 48.47 | 39.61 | 23.83 | 8.42 | 33.17 | |||||||||||||
2022 | -9.58 | -4.43 | 17.29 | 26.73 | 44.03 | 55.73 | 60.74 | 57.77 | a | 46.17 | 33.48 | 21.37 | 5.03 | 29.53 | ||||||||||||
2023 | 4.45 | 1.68 | 5.71 | 26.03 | 45.61 | 58.83 | 55.31 | b | 58.33 | a | 51.53 | ----- | z | ----- | z | ----- | z | 34.17 | c | |||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 2.09 | 5.27 | 18.24 | 31.69 | 44.88 | 55.07 | 60.16 | 56.73 | 47.40 | 34.41 | 21.39 | 7.56 | 32.25 | |||||||||||||
S.D. | 7.75 | 8.15 | 5.81 | 3.84 | 3.58 | 2.72 | 2.45 | 2.96 | 3.00 | 2.76 | 4.32 | 6.41 | 2.02 | |||||||||||||
SKEW | -0.20 | 0.29 | -0.47 | -0.32 | 0.35 | -0.13 | -0.09 | -0.12 | -0.70 | 0.11 | -0.01 | -0.51 | 0.35 | |||||||||||||
MAX | 16.55 | 21.86 | 26.07 | 39.73 | 53.97 | 60.28 | 65.71 | 64.90 | 52.07 | 40.52 | 30.70 | 17.41 | 37.39 | |||||||||||||
MIN | -13.61 | -8.04 | 5.71 | 21.86 | 38.45 | 49.17 | 54.89 | 49.33 | 40.00 | 28.74 | 11.03 | -7.55 | 28.90 | |||||||||||||
YRS | 41 | 43 | 43 | 44 | 43 | 45 | 45 | 41 | 42 | 41 | 42 | 41 | 31 |