YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | 34.60 | 40.10 | 51.87 | 53.20 | a | 51.72 | b | 45.33 | 26.26 | 18.80 | 9.87 | 36.86 | c | |||||||
1953 | 1.58 | 8.07 | 17.19 | 26.67 | 41.77 | 52.70 | 54.40 | a | 56.65 | 41.67 | 36.37 | a | 23.07 | 7.43 | c | 30.63 | ||||||||||
1954 | -10.63 | a | 19.89 | a | 13.61 | 28.17 | 37.32 | 51.27 | 56.94 | 52.74 | 43.63 | 32.48 | 22.57 | 10.94 | 29.91 | |||||||||||
1955 | 0.20 | a | -4.74 | a | 6.16 | 34.20 | 45.70 | a | 52.03 | 61.97 | 58.03 | 43.77 | 32.90 | 7.53 | -5.39 | 27.70 | ||||||||||
1956 | -3.73 | a | -7.07 | 9.58 | 25.30 | 42.13 | 56.03 | 54.55 | 52.68 | 40.17 | 32.74 | 19.57 | 8.52 | 27.54 | ||||||||||||
1957 | -10.48 | j | 1.25 | 14.19 | 28.03 | 41.19 | 48.77 | 59.81 | 52.58 | 41.17 | a | 34.74 | 21.20 | 9.61 | 32.05 | a | ||||||||||
1958 | 5.32 | 0.39 | 20.10 | 30.66 | a | 40.48 | 46.27 | 52.42 | 53.10 | 43.20 | 33.03 | 20.10 | 0.77 | a | 28.82 | |||||||||||
1959 | -5.45 | -4.43 | 18.77 | 28.80 | 41.03 | 55.17 | 55.48 | 55.65 | 44.10 | 30.16 | 10.93 | 17.55 | 28.98 | |||||||||||||
1960 | -2.94 | -0.45 | 3.97 | 29.37 | 41.19 | 50.87 | 55.94 | 54.94 | 45.03 | 30.35 | 18.33 | -2.03 | b | 27.05 | ||||||||||||
1961 | -3.23 | 6.86 | 21.71 | 26.47 | 36.77 | 51.07 | 54.39 | 54.71 | 42.60 | 31.97 | a | 19.21 | a | 1.16 | 28.64 | |||||||||||
1962 | -8.52 | d | -3.93 | 12.74 | 29.67 | 45.71 | 53.63 | 55.58 | 55.03 | 42.37 | 36.65 | 23.37 | 5.39 | 28.97 | ||||||||||||
1963 | -9.23 | a | -3.52 | a | 15.16 | 34.80 | t | 41.42 | 57.37 | 59.87 | 56.81 | 47.83 | 40.13 | 21.53 | -4.10 | 29.39 | a | |||||||||
1964 | 3.10 | 5.14 | 4.16 | 30.50 | 44.27 | a | 52.20 | 59.10 | 53.10 | a | 41.83 | 31.42 | 17.31 | a | -6.16 | 28.00 | ||||||||||
1965 | -12.48 | -6.52 | a | 5.19 | 32.23 | 42.45 | 53.30 | 58.52 | 54.55 | 39.17 | a | 34.74 | 16.03 | a | 11.21 | b | 27.37 | |||||||||
1966 | -14.84 | -3.54 | 20.90 | 27.73 | 38.35 | 52.97 | 61.26 | 53.48 | 43.60 | 30.83 | a | 12.24 | a | 1.19 | 27.02 | |||||||||||
1967 | -0.29 | -7.36 | 15.29 | 27.00 | 36.35 | 50.17 | 53.16 | 50.30 | a | 44.55 | a | 30.79 | c | ----- | z | ----- | z | 30.00 | b | |||||||
1968 | ----- | z | -0.10 | 20.10 | 31.67 | 39.50 | a | 51.67 | 55.84 | 51.06 | 44.73 | ----- | z | 22.73 | 0.87 | a | 31.81 | b | ||||||||
1969 | -9.30 | a | 5.32 | 6.83 | b | 32.50 | 41.48 | b | 45.87 | 56.55 | 55.87 | 45.70 | 31.34 | b | 22.62 | a | 6.23 | a | 28.42 | |||||||
1970 | -9.32 | 0.68 | 6.84 | 31.37 | 40.06 | 58.14 | a | 62.23 | 55.58 | 45.03 | 35.68 | 19.60 | -3.17 | a | 28.56 | |||||||||||
1971 | -8.90 | b | 1.15 | b | 16.90 | 31.83 | 38.84 | 54.30 | 53.23 | 53.00 | 44.10 | 35.77 | ----- | z | ----- | z | 32.02 | b | ||||||||
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | 32.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.19 | 18.53 | 3.39 | 23.03 | h | ||||
1974 | -6.35 | -1.74 | a | 13.55 | 32.00 | 41.50 | a | 50.63 | 58.74 | 48.58 | 36.20 | 28.74 | 16.97 | 7.42 | 27.19 | |||||||||||
1975 | -2.03 | -5.18 | 4.19 | 22.97 | 39.52 | 49.53 | 56.97 | 52.06 | 41.93 | 36.13 | 23.43 | 6.39 | 27.16 | |||||||||||||
1976 | -2.00 | 13.41 | 14.23 | 34.47 | 41.10 | 54.14 | b | 55.45 | 55.48 | 43.20 | 25.33 | a | 10.86 | b | -3.03 | a | 28.55 | |||||||||
1977 | -13.47 | a | 9.07 | a | 21.69 | b | 35.10 | 51.39 | 53.93 | a | 56.97 | a | 48.23 | 45.45 | a | 32.30 | d | 15.54 | b | 1.27 | a | 29.79 | ||||
1978 | -12.06 | -3.86 | 16.55 | b | 32.22 | c | 45.58 | ----- | z | 58.06 | 54.23 | 49.57 | 31.26 | 10.87 | -1.26 | 25.56 | a | |||||||||
1979 | -15.43 | a | -12.82 | 9.00 | a | 24.69 | a | 37.48 | 50.34 | a | 58.35 | 52.81 | 43.38 | a | 29.03 | 14.63 | 10.39 | 25.15 | ||||||||
1980 | -4.06 | 0.15 | b | 10.00 | 32.62 | a | 43.26 | ----- | z | 54.83 | a | 50.59 | b | 40.93 | 29.61 | 21.60 | 1.57 | c | 25.55 | a | ||||||
1981 | -0.84 | 10.64 | 22.86 | b | 33.00 | 43.65 | 51.77 | 59.06 | 57.58 | 43.33 | 32.43 | a | 25.70 | -0.10 | a | 31.59 | ||||||||||
1982 | -17.67 | a | -2.15 | b | 14.77 | 27.64 | b | 46.60 | a | 47.23 | 59.62 | b | 54.70 | a | 43.00 | c | 35.07 | b | 15.93 | a | 13.55 | 28.19 | ||||
1983 | 8.76 | b | 12.73 | b | 22.90 | 29.10 | 38.17 | a | 53.13 | 63.03 | 60.52 | 46.20 | 34.61 | c | 24.38 | a | -10.27 | a | 31.94 | |||||||
1984 | -0.13 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.07 | 0.16 | 6.70 | i | |||
1985 | -3.77 | a | 1.43 | 24.32 | 33.13 | 46.90 | 48.45 | a | 55.71 | 52.29 | 44.60 | 31.71 | 5.00 | -5.17 | a | 27.88 | ||||||||||
1986 | 5.84 | 2.32 | 23.65 | 31.72 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 10.60 | i | |||
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.40 | 54.97 | 52.77 | 39.40 | 27.35 | 15.23 | 4.17 | b | 34.90 | e | ||||||
1994 | -13.48 | b | -7.70 | a | 20.53 | a | 29.80 | 44.54 | c | 54.03 | a | 54.82 | c | 52.97 | a | 46.17 | 35.97 | b | 20.86 | a | 9.10 | a | 28.97 | |||
1995 | -2.14 | c | 1.36 | 16.19 | 26.46 | b | 40.19 | 56.38 | a | 58.35 | 58.23 | a | 44.03 | 35.19 | 13.97 | a | 5.20 | a | 29.45 | |||||||
1996 | -8.90 | 2.14 | 7.68 | c | 26.07 | a | 42.00 | a | 55.00 | a | 53.43 | a | 54.43 | a | 45.90 | a | 31.26 | 7.82 | b | -2.32 | c | 26.21 | ||||
1997 | -9.03 | b | 2.78 | a | 10.50 | a | 25.00 | 38.90 | b | 52.83 | 55.77 | 53.84 | 48.24 | a | 34.40 | a | 17.07 | c | 16.63 | a | 28.91 | |||||
1998 | 3.03 | 19.93 | 16.74 | 35.79 | a | 46.80 | a | 49.83 | 56.42 | 58.45 | 47.23 | 36.03 | 21.93 | 10.13 | a | 33.53 | ||||||||||
1999 | -5.45 | b | 11.86 | 21.35 | 32.83 | 45.71 | 51.90 | ----- | z | 54.38 | g | 45.33 | 34.42 | 25.72 | a | 14.00 | 27.77 | b | ||||||||
2000 | 1.10 | 12.86 | 25.87 | 34.17 | ----- | z | 52.37 | 58.55 | 55.28 | b | 44.10 | 35.19 | 17.82 | b | -7.64 | c | 29.97 | a | ||||||||
2001 | 6.80 | a | -5.07 | a | 17.94 | 33.31 | a | 45.26 | 53.41 | a | ----- | z | 55.55 | 45.55 | a | 32.86 | b | ----- | z | 10.38 | b | 29.60 | b | |||
2002 | 8.30 | a | 13.93 | a | 7.33 | a | 28.31 | a | 38.00 | a | 57.07 | a | 61.58 | 55.83 | a | 49.37 | 28.03 | 19.00 | 11.81 | 31.55 | ||||||
2003 | -0.38 | b | ----- | z | 12.32 | 30.32 | b | 42.79 | b | 52.52 | a | 57.87 | 58.77 | 45.43 | 35.30 | a | 16.00 | 12.26 | 33.02 | a | ||||||
2004 | -6.37 | a | 5.97 | 21.20 | a | 29.66 | a | 40.33 | a | 49.37 | 53.32 | 47.48 | 48.57 | 38.50 | a | 24.63 | 11.54 | e | 30.35 | |||||||
2005 | -0.90 | 11.26 | a | 18.31 | e | 33.88 | e | 45.39 | 57.75 | b | 59.23 | a | 54.96 | c | 51.03 | 34.73 | a | 20.89 | b | 10.21 | c | 33.06 | ||||
2006 | 14.29 | 0.78 | a | 19.57 | a | 38.03 | 47.19 | 55.96 | b | 58.39 | 54.57 | a | 45.77 | 33.26 | 21.07 | b | 17.71 | 33.88 | ||||||||
2007 | 4.52 | b | ----- | z | 24.39 | 31.50 | 48.94 | 59.30 | c | 60.90 | 54.81 | 48.20 | 37.97 | 22.26 | c | 0.00 | c | 35.71 | a | |||||||
2008 | -4.74 | -2.82 | a | 16.07 | d | 26.81 | c | 39.03 | 49.87 | 57.53 | a | 56.10 | 46.60 | 36.55 | 23.77 | -4.87 | a | 28.33 | ||||||||
2009 | -6.97 | a | 0.93 | a | 12.74 | 30.93 | a | 41.77 | 52.03 | 54.45 | 54.68 | 51.40 | 33.16 | 27.43 | 1.23 | e | 29.48 | |||||||||
2010 | 0.78 | d | 0.42 | b | 25.67 | d | 38.30 | 45.53 | a | 55.63 | 61.07 | a | 60.10 | b | 46.54 | b | 37.61 | 20.64 | b | 0.66 | b | 32.75 | ||||
2011 | -2.85 | e | 2.48 | a | 9.93 | a | 32.63 | 43.29 | 55.17 | 62.42 | 57.94 | 45.59 | a | 39.40 | a | 23.33 | 14.93 | a | 32.02 | |||||||
2012 | 10.43 | a | 12.59 | 30.26 | 35.97 | 47.32 | 56.87 | 63.74 | 55.35 | 44.30 | 34.81 | 21.97 | 7.03 | 35.05 | ||||||||||||
2013 | -0.45 | 2.89 | 6.50 | a | 23.73 | 45.23 | 56.73 | 60.19 | 59.10 | 52.83 | 36.68 | 19.70 | -2.84 | 30.02 | ||||||||||||
2014 | -4.74 | -2.93 | 13.97 | 30.47 | 46.65 | 58.40 | 58.26 | 59.58 | 49.57 | 38.84 | 15.33 | 13.23 | 31.38 | |||||||||||||
2015 | 7.65 | -2.61 | 23.74 | 34.90 | 47.10 | 61.33 | 62.00 | 58.90 | 54.70 | 40.84 | 29.03 | 18.81 | 36.37 | |||||||||||||
2016 | 5.87 | 15.55 | 28.48 | 34.63 | 47.81 | 59.53 | 65.35 | 61.65 | 52.45 | a | 39.94 | 33.77 | 8.77 | 37.82 | ||||||||||||
2017 | 8.32 | 16.68 | 19.61 | 34.77 | 45.65 | 58.23 | 63.61 | 57.71 | 57.67 | 38.23 | 20.93 | 9.77 | 35.93 | |||||||||||||
2018 | 4.71 | -1.39 | 20.61 | 26.53 | 51.42 | 61.87 | 62.48 | 61.16 | 52.27 | 34.10 | 18.23 | 15.42 | 33.95 | |||||||||||||
2019 | 0.39 | -7.57 | 12.65 | 35.20 | 43.17 | a | 57.13 | 57.31 | b | 59.55 | 54.27 | 35.94 | 24.93 | 4.35 | 31.44 | |||||||||||
2020 | 7.23 | 7.62 | 21.16 | 29.27 | 43.65 | 60.17 | 63.13 | 59.26 | 48.03 | 30.16 | 23.60 | 14.74 | 34.00 | |||||||||||||
2021 | 12.87 | a | -1.93 | 24.65 | 31.47 | 42.77 | 58.00 | a | 62.74 | 59.10 | 50.80 | 41.58 | 26.07 | 6.29 | 34.53 | |||||||||||
2022 | -6.29 | -4.36 | 16.81 | 28.67 | 46.35 | 56.73 | 61.26 | 58.94 | 49.10 | 35.00 | 19.17 | 2.81 | 30.35 | |||||||||||||
2023 | 3.71 | 2.61 | 3.48 | 26.87 | 50.23 | 61.43 | 56.94 | 59.06 | 51.83 | 37.45 | 23.77 | 21.03 | 33.20 | |||||||||||||
2024 | 8.52 | 20.62 | 20.48 | 35.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.16 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -1.90 | 2.67 | 16.03 | 30.76 | 43.07 | 53.87 | 58.12 | 55.32 | 45.96 | 34.09 | 19.61 | 5.62 | 30.37 | |||||||||||||
S.D. | 7.48 | 7.79 | 6.72 | 3.57 | 3.66 | 3.80 | 3.25 | 3.23 | 4.09 | 3.59 | 5.28 | 7.37 | 2.92 | |||||||||||||
SKEW | 0.03 | 0.60 | -0.16 | -0.11 | 0.24 | 0.13 | 0.20 | -0.19 | 0.50 | -0.20 | -0.44 | -0.03 | 0.61 | |||||||||||||
MAX | 14.29 | 20.62 | 30.26 | 38.30 | 51.42 | 61.87 | 65.35 | 61.65 | 57.67 | 41.58 | 33.77 | 21.03 | 37.82 | |||||||||||||
MIN | -17.67 | -12.82 | 3.48 | 22.97 | 36.35 | 45.87 | 52.42 | 47.48 | 36.20 | 25.33 | 5.00 | -10.27 | 25.15 | |||||||||||||
YRS | 61 | 60 | 62 | 62 | 60 | 60 | 60 | 61 | 62 | 62 | 61 | 62 | 48 |