YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.32 | 29.69 | d | 18.15 | e | 8.27 | h | -0.79 | b | 20.84 | h | |
1949 | -15.90 | b | 2.64 | 11.52 | b | 19.06 | l | 29.77 | a | 34.10 | 36.20 | a | 36.87 | 28.48 | i | 19.37 | d | 18.60 | e | 5.30 | d | 17.85 | b | |||
1950 | 0.55 | 8.67 | a | 9.07 | c | 19.59 | m | 22.21 | c | 31.39 | b | 35.65 | 33.48 | 31.22 | l | 24.50 | e | 14.66 | a | 8.25 | c | 18.84 | b | |||
1951 | -2.81 | 7.15 | a | 9.14 | q | 18.12 | e | 27.42 | e | 29.92 | d | 36.13 | 36.03 | 25.58 | d | 21.08 | e | 7.15 | d | -0.61 | c | 18.65 | a | |||
1952 | -0.79 | c | 0.29 | a | 4.07 | a | 19.68 | h | 27.84 | f | 32.24 | a | 34.06 | 35.29 | 27.83 | 18.00 | f | 3.82 | b | 8.03 | b | 16.09 | c | |||
1953 | 17.83 | a | 6.68 | 13.53 | a | 14.96 | c | 25.96 | h | 33.34 | a | 38.61 | 36.45 | 28.81 | d | 20.70 | d | 16.54 | d | 3.15 | d | 20.97 | a | |||
1954 | 7.07 | a | 9.81 | a | 6.43 | a | 21.56 | c | 27.00 | e | 30.27 | 38.55 | 33.19 | 26.12 | d | 15.08 | g | 12.46 | f | -1.29 | c | 19.87 | b | |||
1955 | -3.80 | a | -2.29 | 0.03 | a | 17.67 | c | 26.78 | h | 30.45 | a | 36.77 | 37.29 | 28.48 | c | 20.45 | i | 7.77 | d | 3.52 | d | 15.59 | b | |||
1956 | 6.77 | -3.28 | 8.48 | 20.19 | d | 30.27 | i | 33.26 | c | 37.42 | 33.71 | 27.52 | c | 21.08 | e | -3.58 | r | 0.72 | b | 18.59 | b | |||||
1957 | -11.61 | 7.46 | 10.00 | 19.80 | 30.42 | 35.17 | 37.35 | 35.43 | a | 26.13 | g | 23.29 | 6.44 | c | 7.47 | n | 19.38 | b | ||||||||
1958 | 1.83 | g | 12.04 | 6.90 | j | 19.27 | 29.80 | a | 34.07 | c | 34.84 | 37.90 | 29.11 | b | 21.16 | 13.40 | 8.78 | m | 25.73 | c | ||||||
1959 | 5.00 | h | 1.75 | 9.61 | 19.25 | b | 26.00 | 35.23 | 39.19 | 37.71 | 32.20 | 23.23 | 4.30 | g | 2.89 | c | 22.71 | b | ||||||||
1960 | 3.19 | d | -2.48 | b | 6.80 | k | 20.47 | 27.13 | a | 33.61 | b | 37.61 | 35.03 | a | 28.29 | b | 21.76 | j | 11.74 | g | 1.07 | c | 20.43 | c | ||
1961 | -2.44 | f | 14.15 | a | 15.72 | b | 20.40 | 28.24 | b | 34.70 | 38.03 | 40.29 | 28.68 | b | 21.40 | a | 8.97 | a | 2.52 | 23.01 | a | |||||
1962 | -9.42 | 7.62 | b | 8.50 | a | 20.73 | 31.75 | c | 35.50 | 36.32 | 35.03 | 28.63 | 23.97 | a | 15.93 | b | 7.81 | 20.20 | ||||||||
1963 | -9.93 | b | 11.42 | b | 8.57 | c | 21.40 | 29.55 | 35.50 | 36.10 | 35.84 | 36.38 | a | 24.69 | b | 16.30 | 2.67 | y | 22.35 | a | ||||||
1964 | 0.07 | a | -3.52 | 3.16 | 18.50 | d | 26.10 | 34.13 | 36.23 | 32.26 | 22.74 | g | 17.29 | j | 6.86 | h | 2.48 | f | 18.37 | d | ||||||
1965 | 4.61 | -2.09 | e | -5.97 | 21.68 | b | 23.94 | 31.11 | c | 34.39 | 32.55 | 21.48 | a | 17.65 | 14.71 | b | 4.69 | b | 16.56 | |||||||
1966 | 1.81 | 1.88 | c | 12.33 | m | 18.93 | b | 26.93 | c | 31.60 | 37.61 | 35.23 | 31.80 | e | 19.17 | a | 16.29 | i | 5.21 | g | 22.77 | c | ||||
1967 | 11.00 | i | 9.76 | g | 6.42 | s | 19.46 | b | 25.76 | b | 35.73 | 39.39 | 35.74 | 31.60 | 27.27 | p | 15.10 | i | -2.52 | 26.45 | e | |||||
1968 | -1.45 | 7.62 | 14.45 | 16.50 | 23.83 | s | 34.87 | 38.87 | 37.52 | 30.47 | 23.06 | 8.62 | a | 1.29 | 19.26 | a | ||||||||||
1969 | 8.42 | 9.57 | 4.48 | 24.13 | 28.71 | 33.83 | 37.39 | 36.77 | 30.97 | 18.58 | 10.50 | 4.87 | 20.69 | |||||||||||||
1970 | 7.73 | a | 6.50 | j | 9.20 | f | 14.73 | d | 28.61 | 36.27 | 40.32 | 37.39 | 27.60 | 17.81 | 15.88 | v | 4.61 | 23.90 | c | |||||||
1971 | 6.97 | 5.57 | 9.26 | ----- | z | 34.07 | b | 35.27 | s | 35.42 | 38.84 | 25.90 | 20.61 | 12.97 | -3.27 | t | 21.07 | c | ||||||||
1972 | 3.55 | i | 8.90 | 19.15 | e | 22.00 | 27.45 | 34.97 | 34.77 | 38.58 | 29.83 | a | 21.76 | b | 12.17 | -3.50 | c | 22.37 | a | |||||||
1973 | -3.00 | d | 2.54 | 11.87 | 19.21 | a | 25.61 | 35.07 | a | 38.61 | 36.55 | 30.40 | 24.23 | 17.38 | a | 9.90 | b | 20.70 | ||||||||
1974 | 5.74 | d | 8.26 | a | 15.80 | a | 21.79 | b | 28.95 | j | 34.30 | 38.90 | 34.68 | 26.45 | a | 23.15 | d | 14.50 | h | 5.64 | q | 23.23 | c | |||
1975 | -9.45 | t | 0.29 | d | 9.81 | o | 11.88 | m | 26.89 | c | 32.63 | 40.32 | 31.00 | 24.17 | 23.32 | 3.25 | f | 16.00 | y | 25.52 | e | |||||
1976 | 5.11 | l | 5.32 | g | 8.56 | m | 17.33 | u | 27.04 | c | 32.97 | 37.06 | 34.43 | j | 25.82 | s | 14.42 | 13.58 | f | -5.43 | x | 27.87 | h | |||
1977 | -6.00 | i | 0.92 | o | 11.05 | l | 18.67 | i | 28.82 | c | 34.87 | 35.94 | 31.58 | 26.50 | 18.94 | 10.30 | 2.26 | h | 26.71 | e | ||||||
1978 | 4.68 | l | 6.00 | m | 17.11 | m | 23.59 | h | 27.46 | c | 31.73 | 36.18 | c | 33.90 | 28.53 | m | 17.11 | d | 5.10 | i | -10.70 | k | 29.28 | g | ||
1979 | -14.85 | d | 7.16 | c | 10.20 | f | 18.96 | c | 26.30 | h | 30.54 | b | 37.17 | a | 39.83 | b | 27.84 | e | 21.38 | e | 1.43 | g | 3.95 | i | 21.00 | d |
1980 | -3.65 | k | 6.75 | m | 10.73 | t | 18.33 | c | 30.73 | e | 35.10 | j | 40.19 | 35.23 | ----- | z | 18.44 | m | 12.31 | a | 9.64 | c | 24.41 | f | ||
1981 | 4.81 | d | 4.22 | e | 15.86 | i | ----- | z | ----- | z | ----- | z | ----- | z | 36.65 | ----- | z | ----- | z | ----- | z | 4.96 | c | 12.66 | h | |
1982 | -2.71 | j | ----- | z | ----- | z | ----- | z | ----- | z | 34.19 | c | 38.74 | ----- | z | ----- | z | ----- | z | 6.24 | a | 3.83 | a | 20.75 | h | |
1983 | ----- | z | 6.59 | f | 16.42 | e | 15.48 | g | ----- | z | 34.16 | k | 39.03 | b | 42.59 | b | 28.84 | e | 25.44 | f | 16.86 | a | -8.97 | 22.46 | f | |
1984 | -3.53 | a | -1.96 | b | 14.81 | e | 19.29 | f | 27.00 | e | ----- | z | 41.90 | a | 39.19 | d | 27.24 | a | 17.68 | c | 11.20 | -4.13 | 16.94 | b | ||
1985 | -7.20 | a | -9.44 | c | 4.86 | c | 21.47 | 28.00 | d | 34.86 | b | 39.86 | c | 33.07 | b | 28.82 | b | 18.41 | b | 5.70 | -5.04 | d | 16.11 | |||
1986 | 2.10 | 10.93 | a | 18.48 | b | 22.71 | i | 27.00 | b | 35.96 | b | ----- | z | 36.69 | b | 29.23 | 19.69 | b | 5.33 | f | -5.27 | a | 19.42 | c | ||
1987 | -5.60 | f | 1.18 | f | 11.40 | a | 19.15 | c | 31.61 | 33.24 | a | 37.39 | 34.42 | 27.21 | a | 14.90 | b | 12.52 | c | -0.03 | a | 22.18 | b | |||
1988 | -6.31 | e | 2.81 | c | 6.24 | f | 19.04 | c | 26.19 | 35.90 | a | 36.10 | 30.34 | b | 25.17 | f | 24.14 | b | 10.81 | c | -1.34 | b | 17.77 | b | ||
1989 | -1.13 | a | -6.52 | a | 13.13 | a | 19.19 | c | 28.37 | a | 33.37 | 39.47 | a | 36.06 | 27.27 | 24.29 | 14.30 | 0.00 | 18.98 | |||||||
1990 | 3.61 | -1.11 | a | 12.03 | 22.87 | 27.29 | 32.07 | a | 35.61 | 35.97 | 31.28 | a | 21.29 | 14.93 | -11.90 | 18.66 | ||||||||||
1991 | -1.77 | 9.79 | 10.23 | 21.07 | 28.48 | 33.70 | 36.60 | a | 37.21 | b | 27.96 | d | 14.63 | a | 5.37 | -1.94 | 18.44 | |||||||||
1992 | -1.97 | 8.19 | b | 16.81 | 23.53 | 29.37 | a | 34.48 | a | 35.03 | 31.77 | 24.67 | 20.30 | a | 5.31 | a | -0.90 | b | 18.88 | |||||||
1993 | -2.93 | a | -2.85 | b | 13.97 | a | 23.34 | a | 31.07 | c | 34.30 | c | 35.19 | 34.10 | a | 24.13 | 21.10 | 2.86 | a | 0.53 | a | 17.90 | ||||
1994 | 7.40 | a | -3.70 | a | 12.67 | a | 20.03 | a | 30.23 | a | 33.17 | a | 34.61 | 33.87 | 24.00 | a | 23.97 | 3.34 | a | 6.00 | a | 18.80 | ||||
1995 | 1.53 | a | 9.32 | 12.41 | b | 22.03 | 26.87 | 38.38 | d | 44.33 | a | 37.76 | b | 29.13 | 21.20 | a | 17.17 | 7.26 | 22.28 | |||||||
1996 | -2.23 | a | 0.59 | b | 7.31 | b | 23.10 | a | 28.70 | a | 34.07 | 37.58 | 33.50 | a | 25.28 | a | 17.39 | 10.28 | a | 2.81 | 18.20 | |||||
1997 | -4.63 | a | -4.18 | 4.97 | a | 13.59 | a | 29.62 | b | 41.21 | b | 42.72 | f | 39.86 | b | 33.00 | c | 24.97 | a | 12.76 | a | 0.71 | 17.44 | a | ||
1998 | 5.55 | 6.33 | a | 12.30 | a | 22.83 | a | 28.48 | b | 33.24 | a | 40.84 | 37.48 | 33.07 | a | ----- | z | 17.43 | 0.81 | 21.67 | a | |||||
1999 | 4.32 | 4.14 | 7.97 | 16.33 | 25.87 | 30.07 | a | 31.37 | a | 37.65 | 19.83 | 13.63 | a | 10.73 | -3.00 | 16.58 | ||||||||||
2000 | -2.14 | c | 3.85 | c | 4.71 | 16.37 | c | 24.17 | b | 27.90 | 31.53 | a | 29.50 | a | 28.71 | b | 24.07 | c | 0.89 | c | 0.32 | 15.82 | ||||
2001 | -3.71 | 3.54 | 16.10 | a | 22.80 | 28.74 | 36.33 | 41.42 | 37.81 | 31.07 | 20.13 | a | 17.10 | a | 2.84 | 21.18 | ||||||||||
2002 | 2.52 | -2.96 | a | 7.71 | 21.23 | 27.17 | b | 36.50 | 40.81 | 33.26 | 29.33 | 14.74 | 7.14 | a | 5.19 | 18.55 | ||||||||||
2003 | 4.97 | -0.64 | 14.10 | 21.47 | 27.10 | a | 30.30 | 37.94 | 37.71 | 25.10 | 19.90 | a | 4.00 | a | 5.97 | 18.99 | ||||||||||
2004 | 1.37 | a | 4.59 | 19.26 | 24.73 | 30.73 | a | 36.60 | 40.55 | 37.42 | 30.25 | b | 25.38 | b | 12.27 | 11.53 | a | 22.89 | ||||||||
2005 | 4.84 | 1.39 | 16.52 | 21.53 | 30.42 | 35.37 | 40.47 | a | 36.74 | 28.87 | 23.80 | a | 13.43 | ----- | z | 23.03 | a | |||||||||
2006 | 5.68 | 0.21 | 11.07 | a | 23.38 | a | 27.37 | a | 35.63 | c | 39.48 | b | 32.84 | 29.30 | 22.36 | c | 16.21 | b | 4.93 | d | 20.70 | |||||
2007 | -3.70 | a | 11.29 | 18.86 | b | 24.64 | b | 30.27 | a | 35.93 | 45.77 | 39.42 | 32.93 | a | 24.66 | b | 10.67 | c | 2.48 | b | 22.77 | |||||
2008 | -1.19 | 6.74 | b | 6.79 | b | 13.37 | c | 29.43 | c | 33.53 | 35.68 | 36.06 | 26.93 | a | 21.10 | a | 19.17 | a | 1.70 | a | 19.11 | |||||
2009 | 2.90 | 4.18 | 10.50 | a | 21.77 | 29.57 | a | 34.21 | a | 38.47 | a | 37.68 | 31.43 | 19.63 | a | 13.07 | a | ----- | z | 22.13 | a | |||||
2010 | 5.04 | c | 6.88 | c | 15.93 | b | 21.76 | a | 25.77 | a | 36.37 | 38.94 | 37.90 | 28.76 | a | 26.29 | 12.33 | 7.58 | 21.96 | |||||||
2011 | 4.71 | -3.21 | 15.71 | 19.34 | a | 29.77 | 36.00 | 41.23 | 40.55 | 31.00 | 26.39 | 9.27 | -0.50 | a | 20.85 | |||||||||||
2012 | 6.55 | 4.28 | 20.06 | 26.87 | 29.32 | 36.07 | 44.00 | 39.26 | 32.27 | 21.65 | 17.73 | 8.52 | 23.88 | |||||||||||||
2013 | 1.16 | 6.64 | 12.03 | 19.90 | 32.74 | 36.40 | 43.03 | 41.77 | 37.70 | 20.77 | 15.43 | -0.52 | 22.26 | |||||||||||||
2014 | 3.81 | 3.68 | 13.77 | 22.97 | 31.29 | 36.30 | 42.71 | 41.97 | 34.10 | 26.03 | 11.70 | 9.32 | 23.14 | |||||||||||||
2015 | 6.35 | 14.25 | 17.65 | 23.67 | 33.55 | 40.13 | 39.94 | 38.58 | 33.37 | 29.39 | 8.43 | 4.65 | 24.16 | |||||||||||||
2016 | 8.94 | 11.41 | 17.81 | 27.53 | 31.94 | 38.90 | 40.52 | 37.81 | 34.30 | 31.68 | 21.20 | -2.35 | 24.97 | |||||||||||||
2017 | -3.74 | 12.39 | 26.77 | 26.63 | 31.10 | 38.24 | a | 39.39 | 38.84 | 33.90 | 22.16 | 17.20 | 6.52 | 24.12 | ||||||||||||
2018 | 9.65 | 3.39 | 15.68 | 22.97 | 34.87 | 38.13 | g | 40.48 | 38.35 | 31.60 | 24.81 | 11.50 | 4.61 | 21.63 | a | |||||||||||
2019 | 3.00 | 1.29 | 7.19 | 27.83 | 31.26 | 37.03 | 41.87 | 41.06 | 35.43 | 15.03 | 13.37 | 6.06 | 21.70 | |||||||||||||
2020 | 10.48 | 1.86 | 15.29 | 20.83 | 34.19 | 38.37 | 40.57 | c | 41.61 | 31.77 | 20.58 | 10.80 | 5.03 | 22.62 | ||||||||||||
2021 | 3.68 | 1.32 | 12.84 | 19.73 | 29.87 | 39.03 | 44.77 | 41.39 | 31.03 | 26.94 | 21.30 | 14.20 | a | 23.84 | ||||||||||||
2022 | -2.29 | 1.21 | 13.90 | 19.83 | 30.65 | 37.43 | 42.90 | 43.33 | a | 35.23 | 25.84 | 2.87 | 8.79 | b | 21.64 | |||||||||||
2023 | 3.16 | 0.04 | 6.23 | 17.67 | 34.00 | 39.50 | 41.55 | 44.16 | 34.90 | 24.77 | 18.10 | a | 9.83 | b | 22.83 | |||||||||||
2024 | 4.81 | 12.72 | 12.52 | 21.93 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 10.02 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 1.14 | 3.95 | 11.75 | 20.72 | 28.87 | 34.60 | 38.46 | 36.71 | 29.43 | 21.53 | 11.86 | 2.75 | 20.60 | |||||||||||||
S.D. | 6.14 | 5.41 | 5.46 | 3.08 | 2.58 | 2.61 | 2.93 | 3.09 | 3.48 | 3.65 | 4.92 | 4.96 | 2.52 | |||||||||||||
SKEW | -0.47 | -0.09 | -0.38 | -0.06 | 0.16 | 0.01 | 0.13 | 0.06 | -0.10 | -0.02 | -0.25 | -0.34 | -0.18 | |||||||||||||
MAX | 17.83 | 14.25 | 26.77 | 27.83 | 34.87 | 41.21 | 45.77 | 44.16 | 37.70 | 31.68 | 21.30 | 14.20 | 24.97 | |||||||||||||
MIN | -15.90 | -9.44 | -5.97 | 13.37 | 22.21 | 27.90 | 31.37 | 29.50 | 19.83 | 13.63 | 0.89 | -11.90 | 15.82 | |||||||||||||
YRS | 63 | 67 | 61 | 62 | 65 | 69 | 72 | 74 | 66 | 65 | 60 | 62 | 35 |