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 | 39.03 | 24.33 | 11.32 | 24.90 | i | |||
1957 | -2.19 | 3.32 | 10.87 | 28.07 | 36.77 | 47.30 | 53.35 | 47.35 | 42.70 | 34.45 | 23.40 | 12.29 | 28.14 | |||||||||||||
1958 | 9.52 | 0.64 | 13.61 | 28.23 | 35.29 | 42.07 | 52.68 | 49.45 | 46.03 | 36.90 | 24.43 | 0.67 | a | 28.29 | ||||||||||||
1959 | -3.16 | -3.29 | 10.48 | 26.77 | 42.65 | 50.13 | 54.74 | 56.35 | 46.30 | 33.74 | 14.40 | 17.68 | 28.90 | |||||||||||||
1960 | 9.55 | 6.86 | 1.03 | 29.30 | 40.45 | 45.00 | 50.42 | 53.52 | 45.67 | 35.61 | 26.90 | a | 6.87 | 29.26 | ||||||||||||
1961 | 0.61 | 8.14 | 17.00 | 25.70 | 34.23 | 45.73 | 53.13 | 53.10 | 47.03 | 38.06 | 24.30 | 11.00 | 29.84 | |||||||||||||
1962 | 1.81 | 0.79 | 17.13 | 25.77 | 44.74 | 46.90 | 50.48 | 51.65 | 43.03 | 36.97 | 26.63 | 9.06 | 29.58 | |||||||||||||
1963 | -3.45 | -4.54 | 12.84 | 28.87 | 38.77 | 50.37 | 55.29 | 51.39 | 46.50 | 42.74 | 29.30 | 5.29 | 29.45 | |||||||||||||
1964 | 12.23 | 6.66 | 9.19 | 28.57 | 43.42 | 47.53 | 55.35 | 50.77 | 45.00 | 33.29 | 25.47 | 7.61 | 30.42 | |||||||||||||
1965 | -0.10 | a | -2.00 | 5.71 | 25.57 | 41.74 | 43.87 | 50.68 | 50.61 | 42.03 | 36.61 | 23.53 | 18.35 | 28.05 | ||||||||||||
1966 | -1.87 | 5.57 | 18.48 | 25.17 | 33.87 | 49.43 | 56.29 | 52.65 | 43.83 | 34.29 | 22.20 | 10.42 | 29.19 | |||||||||||||
1967 | 6.52 | -3.21 | 13.03 | 26.97 | 31.58 | 48.47 | 51.77 | 48.84 | 45.43 | 34.94 | 20.73 | 12.03 | 28.09 | |||||||||||||
1968 | 2.16 | -1.93 | 17.26 | 29.17 | 36.43 | a | 47.27 | 53.00 | 51.35 | 48.77 | 39.32 | 24.03 | 11.32 | 29.85 | ||||||||||||
1969 | 8.61 | 5.64 | 5.29 | 28.37 | 38.00 | 43.73 | 52.48 | 54.93 | a | 46.80 | 34.06 | 22.67 | 13.65 | 29.52 | ||||||||||||
1970 | -0.16 | -1.07 | 7.77 | 26.87 | 37.26 | 48.53 | 56.68 | 52.90 | 47.03 | 39.52 | 24.60 | 10.32 | 29.19 | |||||||||||||
1971 | 0.68 | 3.43 | 7.17 | b | 25.24 | a | 33.60 | a | 49.90 | 49.42 | 49.39 | 48.77 | 42.13 | 23.73 | 11.42 | 28.74 | ||||||||||
1972 | -3.65 | -2.45 | 7.06 | 22.10 | 42.00 | 45.87 | 52.81 | 52.74 | 42.87 | 33.45 | 25.60 | 6.55 | 27.08 | |||||||||||||
1973 | 7.77 | 6.00 | 25.13 | 27.83 | 35.29 | 50.10 | 53.19 | 56.39 | 44.83 | 41.00 | 25.50 | 9.71 | 31.90 | |||||||||||||
1974 | 2.94 | -2.64 | 10.84 | 26.40 | 35.52 | 44.50 | 55.45 | 52.55 | 39.13 | 33.90 | 24.20 | 15.81 | 28.22 | |||||||||||||
1975 | 6.00 | 9.14 | 12.39 | 19.43 | 43.19 | 50.83 | 57.10 | 53.00 | 41.47 | 37.84 | 24.90 | 9.32 | 30.38 | |||||||||||||
1976 | 2.77 | 11.90 | 15.55 | 29.73 | 36.10 | 51.50 | 52.87 | 51.87 | 41.53 | 29.74 | 15.93 | 0.23 | 28.31 | |||||||||||||
1977 | -7.39 | 6.36 | 21.48 | 30.20 | 47.74 | 48.77 | 56.32 | 48.87 | 46.93 | 34.00 | 24.70 | 10.74 | 30.73 | |||||||||||||
1978 | 4.03 | 1.61 | 9.29 | 26.37 | 40.81 | 47.03 | 53.42 | 54.19 | 49.60 | 35.90 | 21.50 | 7.06 | 29.23 | |||||||||||||
1979 | -2.58 | -4.32 | 15.13 | 24.63 | 36.39 | 47.60 | 54.84 | 51.97 | 46.57 | 34.87 | 23.33 | 14.90 | 28.61 | |||||||||||||
1980 | 4.90 | 0.76 | 10.39 | 29.13 | 42.77 | 47.27 | 56.37 | d | 52.84 | 40.87 | 31.35 | 21.40 | 7.42 | 28.79 | ||||||||||||
1981 | 1.68 | 10.29 | 17.61 | 30.40 | 35.23 | 50.27 | 54.03 | 54.71 | 42.93 | 34.61 | 28.00 | 11.71 | 30.96 | |||||||||||||
1982 | -5.55 | 3.18 | 14.30 | a | 22.53 | 44.77 | 42.07 | 55.35 | 49.55 | 45.67 | 37.03 | 23.50 | 12.11 | c | 28.71 | |||||||||||
1983 | 10.67 | a | 15.46 | 20.06 | 25.03 | 35.55 | 49.87 | 59.16 | 58.26 | 49.33 | 36.61 | 26.93 | 2.13 | a | 32.42 | |||||||||||
1984 | 1.35 | 19.10 | 5.61 | 29.13 | 35.90 | 52.33 | 53.35 | 57.94 | 43.77 | 40.39 | 25.03 | 10.90 | b | 31.23 | ||||||||||||
1985 | 2.00 | 1.50 | 19.63 | a | 32.97 | a | 43.26 | 47.63 | 53.00 | 53.53 | a | 47.93 | 37.58 | 21.57 | 8.11 | v | 32.78 | a | ||||||||
1986 | 6.33 | d | 2.68 | 17.32 | c | 30.67 | 39.87 | 41.93 | 53.61 | 48.94 | 44.97 | 33.29 | 19.13 | 13.45 | 29.35 | |||||||||||
1987 | 10.16 | 14.96 | a | 19.97 | 29.60 | 42.06 | 50.03 | 56.61 | 54.10 | 47.43 | b | 31.48 | 27.47 | 19.27 | a | 33.60 | ||||||||||
1988 | 2.87 | a | -2.19 | b | 13.07 | a | 27.30 | 40.23 | 48.57 | 53.68 | 54.58 | 43.80 | 30.93 | a | 25.90 | a | 8.42 | 28.93 | ||||||||
1989 | 10.24 | b | -3.61 | 8.07 | b | 25.13 | 37.84 | 46.24 | a | 55.65 | 54.16 | 45.30 | 35.00 | b | 18.93 | -0.55 | b | 27.70 | ||||||||
1990 | 14.16 | 6.38 | b | 18.52 | 30.69 | a | 33.77 | a | 49.77 | 52.48 | 52.82 | c | 45.28 | a | 33.48 | f | 26.97 | 12.40 | a | 31.20 | a | |||||
1991 | 2.40 | a | 8.68 | 17.16 | 31.57 | 44.67 | a | 51.68 | b | 54.77 | 54.32 | 44.45 | a | 33.10 | 17.14 | a | 6.50 | a | 30.54 | |||||||
1992 | 8.06 | 8.07 | a | 10.35 | e | 27.48 | a | 39.71 | 43.96 | b | 47.13 | a | 47.34 | b | 44.04 | c | 32.45 | 21.45 | a | 12.03 | b | 28.51 | ||||
1993 | 5.30 | a | 1.19 | a | 9.71 | 25.48 | a | 39.85 | d | 45.50 | 54.24 | b | 54.10 | b | 39.15 | c | 29.22 | h | 17.86 | b | 10.03 | b | 27.49 | a | ||
1994 | -9.23 | a | -6.81 | b | 13.41 | b | 23.71 | b | 34.00 | b | 49.18 | b | 51.00 | a | 49.26 | 48.39 | b | 36.04 | d | 23.38 | a | 18.57 | a | 27.57 | ||
1995 | 8.87 | a | 6.18 | 16.80 | a | 21.96 | b | 38.19 | d | 53.10 | a | 55.38 | b | 57.42 | 41.63 | c | 36.97 | a | 12.37 | c | 5.18 | c | 29.50 | |||
1996 | -5.00 | d | -6.48 | d | 3.58 | 19.55 | a | ----- | z | 48.03 | 49.19 | d | ----- | z | 47.50 | b | ----- | z | ----- | z | ----- | z | 22.34 | e | ||
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.23 | 51.63 | ----- | z | 24.57 | 15.23 | 36.66 | h | ||||
2006 | 20.00 | 5.75 | 18.61 | ----- | z | 44.00 | ----- | z | ----- | z | 52.89 | c | 42.96 | e | 31.54 | e | 27.77 | d | 11.71 | x | 30.44 | d | ||||
2007 | 3.95 | j | -1.76 | g | 18.24 | b | 25.93 | a | ----- | z | 51.23 | 51.57 | c | 50.39 | 48.50 | 41.40 | f | 22.66 | a | 10.19 | 34.84 | d | ||||
2008 | 8.87 | -0.66 | 5.04 | d | 28.67 | 36.74 | 50.87 | 54.90 | 52.32 | 47.78 | c | 36.06 | 25.30 | 3.29 | 29.10 | |||||||||||
2009 | -4.80 | a | 5.68 | 12.39 | 28.67 | 38.39 | 48.50 | 50.63 | a | 52.42 | 51.20 | 32.35 | 30.77 | 10.52 | 29.73 | |||||||||||
2010 | 10.32 | 8.93 | 23.48 | 33.17 | 45.16 | 52.03 | 58.94 | 58.71 | 42.77 | 35.74 | 26.70 | 12.29 | 34.02 | |||||||||||||
2011 | 5.61 | 6.21 | 14.58 | 28.47 | 39.81 | 48.77 | 59.35 | 55.39 | 44.80 | 39.26 | 28.48 | g | 17.10 | 32.67 | a | |||||||||||
2012 | 10.23 | 16.14 | 31.29 | 28.67 | u | ----- | z | 53.23 | 59.19 | 53.52 | 43.07 | 35.22 | h | 23.44 | l | 19.21 | b | 35.73 | d | |||||||
2013 | 8.35 | 4.93 | 10.57 | a | 23.43 | 38.26 | 49.07 | 55.48 | 54.19 | 46.37 | 36.81 | 23.04 | f | 2.78 | m | 32.75 | b | |||||||||
2014 | -1.08 | g | -3.32 | 2.16 | 23.80 | 41.03 | 52.03 | 52.68 | 53.03 | 45.53 | 35.35 | 15.93 | 15.74 | 30.36 | a | |||||||||||
2015 | 3.97 | -11.65 | h | 13.42 | 29.17 | 41.77 | 47.20 | ----- | z | ----- | z | 52.17 | a | 35.18 | c | 28.86 | b | 22.36 | c | 30.45 | c | |||||
2016 | 9.16 | 12.79 | 20.32 | 27.34 | a | 40.14 | c | 50.79 | a | 55.77 | a | 57.67 | a | 51.24 | a | 38.07 | a | 30.74 | c | 11.55 | 33.80 | |||||
2017 | 11.50 | a | 13.25 | 14.38 | b | 29.79 | a | 38.28 | b | 51.38 | a | 54.34 | b | 51.33 | d | 50.17 | 40.26 | d | 22.50 | 7.87 | 32.09 | |||||
2018 | 5.97 | a | 1.89 | a | 11.10 | a | 19.25 | b | 44.64 | c | 50.69 | a | 56.32 | c | 56.00 | h | 50.07 | b | 32.38 | g | 17.04 | b | 14.87 | a | 27.18 | b |
2019 | -1.97 | b | -1.59 | a | 9.03 | a | 26.36 | e | 38.04 | c | 46.86 | b | 57.43 | c | 51.21 | b | 50.90 | a | 36.28 | b | 19.08 | d | 12.03 | a | 28.64 | |
2020 | 11.39 | c | 3.74 | j | 17.32 | 23.43 | 39.48 | 50.93 | c | 58.80 | a | 55.19 | 45.23 | 30.96 | c | 26.90 | 13.28 | b | 33.90 | a | ||||||
2021 | 10.24 | b | -8.11 | 15.87 | a | 29.07 | 39.90 | b | 53.41 | a | 53.03 | a | 53.96 | c | 45.33 | 42.00 | 18.93 | 10.83 | b | 30.37 | ||||||
2022 | -5.68 | c | -7.89 | 7.73 | a | 24.73 | 42.39 | c | 49.38 | a | 55.03 | 54.70 | a | 46.97 | 35.61 | 24.82 | b | 10.61 | c | 28.20 | ||||||
2023 | 14.42 | 7.82 | 9.73 | a | 27.38 | a | 40.37 | a | 51.55 | a | 52.52 | b | 49.42 | g | 47.62 | a | 38.50 | c | 23.38 | a | 23.30 | a | 30.60 | a | ||
2024 | 9.45 | 12.28 | 18.71 | 27.50 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.98 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.33 | 3.64 | 13.45 | 26.91 | 39.31 | 48.56 | 54.16 | 52.94 | 45.84 | 35.91 | 23.38 | 11.13 | 29.65 | |||||||||||||
S.D. | 6.26 | 6.51 | 5.87 | 3.09 | 3.63 | 2.88 | 2.64 | 2.68 | 3.06 | 3.06 | 3.97 | 5.07 | 1.65 | |||||||||||||
SKEW | -0.09 | 0.24 | 0.27 | -0.52 | 0.07 | -0.53 | -0.10 | 0.03 | 0.02 | 0.24 | -0.64 | -0.03 | 1.10 | |||||||||||||
MAX | 20.00 | 19.10 | 31.29 | 33.17 | 47.74 | 53.41 | 59.35 | 58.71 | 52.17 | 42.74 | 30.77 | 23.30 | 34.02 | |||||||||||||
MIN | -9.23 | -8.11 | 1.03 | 19.25 | 31.58 | 41.93 | 47.13 | 47.34 | 39.13 | 29.74 | 12.37 | -0.55 | 27.08 | |||||||||||||
YRS | 57 | 56 | 59 | 57 | 55 | 57 | 56 | 55 | 59 | 53 | 56 | 56 | 44 |