YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | 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 | 30.56 | l | 40.94 | 55.30 | 57.58 | 59.81 | 47.60 | 37.19 | 21.90 | 3.00 | 40.41 | d | ||||||||
1962 | -6.16 | -2.11 | a | 16.32 | 26.77 | 47.10 | 55.12 | d | 56.54 | e | 57.04 | d | 45.37 | 40.00 | 27.90 | 7.10 | 30.91 | |||||||||
1963 | -7.55 | -1.29 | 21.71 | 34.50 | 42.77 | 57.77 | 60.94 | 58.35 | 50.55 | a | 46.03 | 25.57 | -1.58 | 32.31 | ||||||||||||
1964 | 5.10 | 4.21 | 8.16 | 31.93 | 46.48 | 53.77 | 60.68 | 54.26 | 45.43 | 35.90 | 22.00 | -0.27 | a | 30.64 | ||||||||||||
1965 | -9.26 | -4.93 | 1.03 | 31.67 | 44.87 | 52.57 | 57.23 | a | 55.29 | 41.30 | 37.06 | 19.45 | a | 13.23 | 28.29 | |||||||||||
1966 | -17.10 | a | -1.64 | 20.28 | b | 27.37 | 38.61 | 54.13 | 61.81 | 55.39 | 47.03 | 36.03 | a | 16.40 | 5.74 | 28.67 | ||||||||||
1967 | -0.47 | a | -8.75 | 14.81 | 30.27 | 36.87 | 51.97 | 55.68 | 52.80 | a | 47.23 | 34.94 | 20.00 | 6.90 | 28.52 | |||||||||||
1968 | -3.61 | -2.97 | 20.87 | a | 32.03 | 40.48 | 53.67 | 56.35 | 55.61 | 47.17 | 37.23 | 23.23 | 0.30 | d | 30.03 | |||||||||||
1969 | -9.74 | 3.68 | 5.77 | 32.60 | 44.87 | 46.67 | 55.81 | 58.97 | 47.40 | 33.06 | 21.03 | 8.00 | 29.01 | |||||||||||||
1970 | -10.48 | -3.96 | 7.39 | 27.93 | 40.74 | 54.73 | 58.48 | 55.74 | 47.60 | 36.03 | 19.27 | -0.32 | 27.76 | |||||||||||||
1971 | -10.81 | 1.11 | 15.55 | 30.13 | 39.97 | 55.87 | 54.35 | 53.23 | 48.47 | 38.71 | 20.77 | 0.47 | a | 28.98 | ||||||||||||
1972 | -10.26 | -9.21 | 12.52 | 28.37 | 48.94 | 52.70 | 56.45 | 57.48 | 44.73 | 32.45 | 19.57 | -4.52 | 27.44 | |||||||||||||
1973 | 3.00 | 5.79 | 27.39 | 31.63 | 42.61 | 53.93 | 56.32 | 61.03 | 46.17 | 40.77 | 20.27 | 2.35 | 32.61 | |||||||||||||
1974 | -7.68 | -3.36 | 12.06 | 31.17 | 40.00 | 52.50 | 62.68 | 54.35 | 41.30 | 37.00 | 23.90 | a | 14.10 | 29.84 | ||||||||||||
1975 | -0.68 | 0.71 | 6.94 | 27.30 | 44.55 | 55.73 | 63.39 | 57.97 | 44.90 | 38.84 | 23.13 | 5.58 | 30.70 | |||||||||||||
1976 | -3.42 | 12.34 | 15.35 | 35.50 | 42.52 | 57.40 | 59.07 | b | 58.52 | 47.00 | 30.23 | 14.40 | -5.10 | a | 30.32 | |||||||||||
1977 | -13.90 | 10.30 | e | 24.45 | 38.43 | 53.35 | 55.18 | b | 60.26 | 53.10 | 49.90 | 36.13 | 19.60 | -1.06 | 32.14 | |||||||||||
1978 | -10.26 | -7.80 | c | 14.26 | 29.88 | d | 47.42 | 53.33 | 59.55 | 57.81 | 53.73 | 36.30 | a | 16.63 | -0.68 | 29.18 | ||||||||||
1979 | -16.19 | -9.71 | 14.52 | 26.07 | 39.00 | 53.00 | 58.94 | 56.16 | 48.77 | 34.48 | 20.00 | 14.39 | 28.28 | |||||||||||||
1980 | -3.00 | a | -0.14 | a | 7.26 | 33.80 | 46.65 | 54.10 | 59.77 | 56.39 | 46.97 | 34.26 | 25.17 | 5.32 | 30.54 | |||||||||||
1981 | 3.84 | 11.64 | 21.61 | 34.34 | a | 43.90 | a | 55.73 | 61.26 | 59.29 | 46.70 | 36.23 | 28.62 | a | 4.39 | 33.96 | ||||||||||
1982 | -17.17 | b | 0.61 | 13.94 | 29.43 | 49.23 | a | 49.77 | 62.55 | 57.71 | 47.77 | 38.48 | 18.03 | 15.10 | a | 30.45 | ||||||||||
1983 | 5.79 | b | 15.00 | 22.61 | 31.00 | 41.94 | 55.00 | 64.94 | 64.13 | 50.10 | 38.13 | a | 25.50 | -10.77 | 33.61 | |||||||||||
1984 | -1.75 | c | 16.04 | c | 10.77 | 34.77 | 43.53 | a | 57.57 | 60.45 | 61.58 | 43.93 | 40.83 | b | 22.27 | 2.35 | 32.70 | |||||||||
1985 | -5.63 | a | -1.14 | 22.84 | 35.40 | 49.97 | 50.67 | 59.23 | 55.71 | 46.45 | a | 35.97 | 9.80 | -4.65 | 29.55 | |||||||||||
1986 | 6.47 | a | 1.48 | a | 20.74 | 35.73 | 46.32 | 58.07 | 61.68 | 56.35 | 48.80 | 37.90 | 16.50 | b | 11.90 | b | 33.50 | |||||||||
1987 | 8.10 | a | 18.63 | a | 23.71 | 39.03 | 50.30 | a | 60.13 | 63.19 | 58.81 | 50.03 | 34.35 | 26.77 | 14.65 | 37.31 | ||||||||||
1988 | -4.29 | -1.59 | 20.52 | b | 31.43 | 52.13 | 60.63 | 64.00 | 60.58 | 49.93 | 33.26 | 21.45 | a | 4.76 | b | 32.73 | ||||||||||
1989 | 3.20 | a | -9.81 | a | 11.68 | 30.27 | 47.33 | a | 54.93 | 64.10 | 58.65 | 50.33 | 36.00 | 16.50 | -4.65 | 29.88 | ||||||||||
1990 | 12.06 | 5.14 | 22.39 | 32.10 | 42.81 | 57.00 | 59.84 | 59.42 | 53.03 | 34.77 | 24.37 | 2.29 | 33.77 | |||||||||||||
1991 | -3.42 | 9.07 | a | 20.77 | 35.00 | 50.42 | 59.97 | 60.00 | 61.06 | 48.60 | 34.65 | 16.30 | 8.70 | a | 33.43 | |||||||||||
1992 | 7.47 | a | 15.76 | 21.42 | 30.83 | 47.13 | 53.07 | 54.39 | 56.58 | 47.70 | 34.55 | 22.20 | 4.03 | b | 32.93 | |||||||||||
1993 | -2.58 | 2.04 | 14.07 | a | 31.53 | 44.77 | 52.77 | 58.81 | 59.94 | 44.80 | 34.23 | 19.20 | 6.61 | 30.51 | ||||||||||||
1994 | -12.90 | -3.71 | 20.81 | 31.30 | 47.42 | 57.34 | a | 59.13 | 55.81 | 51.60 | 41.16 | 26.31 | a | 12.97 | 32.27 | |||||||||||
1995 | 2.00 | 1.67 | a | 19.35 | 28.70 | 44.16 | 60.27 | 61.06 | 61.39 | 48.37 | 37.29 | 15.17 | 5.94 | 32.11 | ||||||||||||
1996 | -11.37 | a | 1.86 | 7.87 | a | 27.50 | 42.90 | 57.67 | 58.29 | 60.23 | 48.93 | 36.42 | 11.97 | 0.81 | 28.59 | |||||||||||
1997 | -6.40 | a | 3.54 | 12.42 | 27.83 | 41.58 | 57.63 | 61.84 | 57.58 | 52.50 | 39.23 | a | 19.73 | 17.26 | 32.06 | |||||||||||
1998 | 4.13 | 21.86 | 20.77 | 36.40 | 50.10 | a | 54.27 | 61.23 | 60.87 | 55.27 | 40.10 | 25.41 | a | 12.00 | 36.87 | |||||||||||
1999 | -1.00 | 13.21 | 20.94 | 34.63 | 49.23 | 56.43 | 64.23 | 58.48 | 48.73 | 35.45 | 28.00 | 12.67 | a | 35.08 | ||||||||||||
2000 | 1.00 | a | 10.72 | 25.84 | 32.73 | 46.80 | a | 53.53 | 60.19 | 60.19 | 47.70 | 40.13 | a | 23.20 | -6.80 | a | 32.94 | |||||||||
2001 | 6.48 | -5.04 | a | 12.55 | 33.48 | a | 47.06 | 56.45 | a | 62.65 | 62.23 | 51.00 | b | 38.16 | 34.37 | 15.72 | b | 34.59 | ||||||||
2002 | 8.89 | c | 14.82 | 10.13 | 29.61 | b | 39.33 | a | 59.70 | 63.48 | 57.84 | 54.57 | 30.70 | a | 17.81 | d | 11.68 | 33.21 | ||||||||
2003 | -7.79 | l | -2.79 | 11.27 | a | 32.00 | d | 45.08 | e | 55.85 | d | 61.52 | h | 62.83 | h | 47.65 | j | 35.62 | j | 16.96 | f | 11.27 | e | 25.45 | f | |
2004 | -9.22 | d | 1.81 | c | 19.07 | a | 28.76 | e | 40.87 | a | 52.07 | c | 57.97 | b | 52.14 | c | 53.54 | d | 37.00 | j | 23.20 | j | 13.35 | n | 33.00 | c |
2005 | -6.93 | d | 6.50 | b | 13.48 | d | 34.74 | c | 42.04 | c | 60.00 | 62.72 | b | 57.82 | c | 52.04 | f | 37.50 | c | 24.14 | h | 10.21 | l | 34.21 | c | |
2006 | 14.96 | g | -5.38 | b | 21.32 | f | 35.67 | f | 44.75 | g | 53.12 | n | 60.81 | d | 58.85 | d | 47.30 | j | 31.25 | o | 19.50 | l | 16.44 | m | 38.09 | i |
2007 | 3.05 | i | -2.80 | m | 21.42 | l | 26.79 | k | 42.06 | m | 54.07 | p | 60.90 | k | 55.12 | o | 51.33 | l | 42.00 | l | 19.11 | l | -2.24 | n | ----- | z |
2008 | -4.12 | g | -6.52 | h | 9.30 | a | 25.64 | h | 40.13 | h | 52.13 | o | 59.35 | n | 58.70 | k | 49.32 | k | 36.30 | d | 23.29 | b | -0.18 | n | 22.96 | i |
2009 | -15.16 | f | 0.83 | d | 13.55 | b | 28.14 | a | 40.39 | m | 52.32 | h | 56.30 | k | 59.86 | q | 52.10 | t | 32.92 | f | 30.38 | a | 5.06 | 15.59 | g | |
2010 | -0.70 | a | -1.85 | a | 24.72 | b | 37.52 | a | 43.97 | b | 50.77 | q | 60.62 | r | 60.69 | o | 46.40 | e | 38.12 | e | 21.87 | 4.43 | a | 23.83 | c | |
2011 | -5.43 | a | 2.50 | b | 9.07 | a | 31.76 | e | 42.04 | g | 52.59 | h | 62.77 | e | 59.90 | k | 45.10 | j | 39.44 | f | 23.32 | b | 15.63 | a | 19.95 | e |
2012 | 8.86 | b | 10.11 | b | 29.03 | b | 34.19 | c | 46.92 | e | 54.96 | e | 64.29 | g | 58.26 | h | 46.12 | d | 36.27 | e | 21.81 | c | 6.83 | b | 29.51 | b |
2013 | -1.24 | b | 0.68 | 5.48 | 21.46 | b | 41.14 | b | 53.42 | d | 60.89 | d | 58.04 | h | 51.23 | 37.26 | 18.07 | a | -7.05 | i | 28.84 | b | ||||
2014 | -9.65 | -10.33 | a | 9.35 | e | 26.29 | b | 42.96 | c | 56.31 | a | 57.58 | 58.68 | 48.77 | d | 37.90 | b | 13.73 | 13.07 | b | 28.72 | |||||
2015 | 6.38 | e | -7.15 | b | 17.83 | b | 30.59 | a | 42.90 | a | 54.39 | b | 60.86 | b | 57.39 | 54.70 | 38.76 | f | 28.77 | 17.84 | 33.14 | a | ||||
2016 | 3.55 | 11.28 | 26.84 | 31.57 | 45.45 | 56.57 | b | 60.26 | 59.52 | 52.57 | 39.11 | d | 32.07 | a | 6.58 | 35.45 | ||||||||||
2017 | 4.06 | 12.36 | 15.84 | 32.78 | g | 44.00 | b | 54.57 | 59.63 | a | 56.87 | a | 51.04 | b | 37.20 | a | 18.97 | 3.90 | 32.58 | a | ||||||
2018 | -3.14 | c | -6.00 | a | 17.93 | a | 19.00 | 48.74 | 57.89 | b | 61.60 | a | 58.40 | a | 50.66 | a | 32.39 | 14.43 | 12.70 | d | 30.38 | |||||
2019 | -7.36 | f | -8.48 | a | 9.77 | 31.77 | d | 39.97 | a | 54.93 | a | 61.84 | 56.79 | b | 52.45 | a | 34.74 | 19.47 | 5.87 | 32.65 | a | |||||
2020 | 3.03 | 1.57 | f | 16.74 | 27.00 | 42.94 | 57.69 | a | 62.60 | a | 59.52 | 47.70 | 31.58 | 24.18 | b | 11.97 | a | 34.99 | a | |||||||
2021 | 10.17 | a | -5.18 | 22.06 | 31.43 | 43.48 | 58.10 | 62.32 | c | 60.79 | c | 52.03 | 42.53 | a | 25.40 | 7.13 | a | 34.19 | ||||||||
2022 | -11.58 | -9.79 | 14.55 | b | 24.59 | a | 44.87 | a | 55.55 | a | 61.19 | 59.39 | 51.43 | 37.77 | 22.10 | 4.03 | a | 29.51 | ||||||||
2023 | 3.68 | 0.71 | 4.71 | 24.96 | c | 47.29 | c | 58.93 | a | 58.10 | b | 59.34 | b | 54.57 | 40.50 | c | 23.69 | a | 22.76 | b | 33.27 | |||||
2024 | 6.97 | 18.52 | 20.06 | 33.94 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 15.18 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -2.29 | 2.21 | 15.98 | 30.97 | 44.65 | 55.43 | 60.17 | 57.99 | 48.90 | 36.78 | 21.57 | 6.30 | 31.48 | |||||||||||||
S.D. | 7.59 | 8.34 | 6.45 | 3.87 | 3.63 | 2.77 | 2.57 | 2.51 | 3.21 | 2.93 | 4.86 | 7.00 | 2.43 | |||||||||||||
SKEW | -0.11 | 0.48 | -0.11 | -0.49 | 0.20 | -0.34 | -0.38 | -0.23 | -0.04 | 0.29 | 0.14 | -0.09 | 0.36 | |||||||||||||
MAX | 12.06 | 21.86 | 29.03 | 39.03 | 53.35 | 60.63 | 64.94 | 64.13 | 55.27 | 46.03 | 34.37 | 22.76 | 37.31 | |||||||||||||
MIN | -17.17 | -10.33 | 1.03 | 19.00 | 36.87 | 46.67 | 54.35 | 52.14 | 41.30 | 30.23 | 9.80 | -10.77 | 27.44 | |||||||||||||
YRS | 57 | 60 | 61 | 58 | 58 | 57 | 57 | 55 | 56 | 56 | 58 | 57 | 47 |