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 | ----- | z | 15.00 | o | 12.93 | d | 12.93 | k |
1957 | 8.73 | a | 21.58 | b | 29.45 | 33.86 | b | 42.35 | 48.40 | 52.73 | a | 52.94 | 40.07 | a | 33.24 | b | 21.31 | a | 17.74 | 33.53 | ||||||
1958 | 10.47 | a | 26.29 | 26.19 | 33.07 | c | 46.00 | b | 49.70 | 52.35 | 55.77 | 42.40 | 31.97 | 22.47 | 23.35 | 35.00 | ||||||||||
1959 | 20.58 | 21.39 | 26.26 | 33.77 | 36.35 | 48.33 | 51.32 | 50.81 | 42.30 | 32.32 | 18.53 | 11.10 | 32.76 | |||||||||||||
1960 | 7.06 | 10.71 | h | 24.71 | 32.90 | 36.93 | a | 46.83 | 55.45 | b | 47.42 | 44.63 | 31.61 | 25.07 | a | 8.61 | 32.84 | a | ||||||||
1961 | 11.23 | 23.54 | 26.06 | 29.57 | b | 40.67 | a | 51.03 | 56.48 | 56.73 | a | 41.47 | 32.39 | 24.23 | 19.00 | 34.37 | ||||||||||
1962 | 7.97 | 19.75 | 24.39 | 35.58 | d | 42.65 | 47.87 | 53.29 | 51.19 | 43.87 | 37.07 | c | 26.63 | 18.89 | d | 34.09 | ||||||||||
1963 | 9.00 | a | 28.60 | c | 26.93 | d | 34.30 | g | 47.43 | c | 46.36 | b | 55.57 | a | 54.16 | 48.20 | 39.61 | 26.66 | a | 13.77 | 36.03 | a | ||||
1964 | 6.30 | a | 2.57 | a | 13.10 | b | 33.87 | 41.63 | a | 48.10 | ----- | z | 51.52 | 40.03 | 32.13 | 26.50 | b | 22.84 | 28.96 | a | ||||||
1965 | 18.90 | a | 20.39 | 21.68 | 38.59 | a | 40.00 | 48.10 | 53.61 | 51.45 | 39.37 | 31.87 | 28.41 | a | 11.19 | 33.63 | ||||||||||
1966 | 14.61 | 12.18 | 22.07 | b | 29.77 | 41.42 | 45.27 | 55.16 | 48.74 | 45.28 | a | 28.42 | 25.97 | a | 11.33 | a | 31.68 | |||||||||
1967 | 16.73 | a | 22.21 | 25.33 | a | 29.03 | a | 39.45 | 48.14 | a | 52.72 | b | 52.65 | 44.97 | 33.10 | 25.40 | 9.00 | 33.23 | ||||||||
1968 | 2.74 | 13.62 | 27.77 | 30.55 | a | 38.00 | a | 47.47 | 55.77 | 50.97 | 41.59 | a | ----- | z | 24.70 | 15.74 | 31.72 | a | ||||||||
1969 | ----- | z | 12.37 | a | 13.90 | 34.40 | 44.42 | 47.22 | c | 53.87 | 54.61 | 47.50 | 31.21 | c | 22.71 | b | 19.97 | a | 34.74 | a | ||||||
1970 | 20.45 | 24.89 | 25.23 | 28.73 | 38.87 | 46.70 | 52.61 | 54.65 | 38.52 | a | 27.94 | 29.37 | 16.13 | 33.67 | ||||||||||||
1971 | 18.10 | 20.75 | 24.06 | 32.87 | 40.76 | b | 46.66 | a | 54.27 | a | 54.86 | b | 39.72 | a | 31.83 | b | 23.24 | a | 12.90 | 33.33 | ||||||
1972 | 16.77 | a | 21.34 | 29.63 | a | 32.03 | 41.82 | c | 51.37 | 53.50 | a | 53.52 | b | 41.47 | 37.13 | 28.23 | ----- | z | 36.98 | a | ||||||
1973 | 6.00 | 13.11 | 26.53 | a | 32.17 | 43.55 | 49.07 | 55.85 | d | 53.00 | 42.24 | a | 33.77 | 27.50 | 18.06 | 33.40 | ||||||||||
1974 | 11.00 | 8.21 | 28.52 | 32.77 | 40.52 | 50.20 | 55.57 | a | 49.60 | a | 41.50 | b | 33.97 | 24.68 | b | 13.58 | 32.51 | |||||||||
1975 | 8.55 | b | 17.23 | b | 24.37 | a | 28.56 | c | 34.94 | 43.60 | 56.68 | 49.00 | b | 38.57 | 31.03 | 20.17 | a | 18.17 | b | 30.91 | ||||||
1976 | 9.17 | a | 7.24 | 12.87 | 32.53 | 43.03 | 44.90 | a | 54.29 | 49.32 | 44.23 | 28.58 | 21.38 | a | 11.29 | 29.90 | ||||||||||
1977 | 5.48 | 12.07 | 22.42 | 33.03 | a | 38.45 | 51.86 | a | 53.12 | f | 53.83 | b | 42.90 | a | 33.16 | 25.87 | 24.43 | a | 31.23 | a | ||||||
1978 | 22.94 | 24.79 | 30.39 | 33.00 | 36.90 | 43.90 | 51.13 | 48.13 | a | 42.14 | a | 32.33 | a | 18.97 | a | 10.29 | 32.91 | |||||||||
1979 | -1.29 | 9.71 | 22.62 | b | 31.18 | b | 38.55 | 45.23 | 52.97 | 53.90 | 44.10 | 34.33 | a | 17.87 | 12.07 | b | 30.10 | |||||||||
1980 | 17.39 | 20.17 | 26.67 | a | 33.43 | 39.97 | a | 43.10 | 50.00 | 45.10 | a | 44.60 | 31.55 | 22.60 | 14.61 | 32.43 | ||||||||||
1981 | 18.94 | 13.71 | 27.97 | 32.53 | 38.61 | 43.52 | a | 52.34 | b | 53.81 | 47.03 | 33.73 | a | 29.03 | 22.97 | 34.52 | ||||||||||
1982 | 10.24 | j | 9.80 | h | 28.90 | k | 32.38 | i | 40.57 | j | 49.83 | g | 56.08 | g | 60.77 | i | 48.91 | g | 36.41 | i | 25.33 | i | 19.40 | f | ----- | z |
1983 | 25.00 | i | 26.81 | g | 32.14 | i | 32.43 | g | 41.64 | i | 50.67 | l | 57.44 | m | 60.19 | 49.54 | b | 39.21 | b | 27.27 | d | 17.30 | d | 38.70 | g | |
1984 | 12.33 | d | 10.31 | 25.39 | c | 32.48 | e | 45.16 | f | 49.52 | e | 57.15 | d | 54.72 | b | 42.96 | c | 30.97 | a | 25.76 | a | 9.32 | 31.90 | a | ||
1985 | 0.90 | 0.32 | 12.07 | b | 33.47 | 41.46 | c | 46.45 | a | 56.77 | 47.65 | 41.47 | 30.67 | a | 16.79 | f | 8.77 | 29.09 | a | |||||||
1986 | 8.23 | 28.18 | 32.74 | 33.97 | 39.10 | 51.85 | c | 51.52 | 54.97 | 40.50 | 33.42 | 24.77 | 17.06 | 34.69 | ||||||||||||
1987 | 4.57 | a | 23.19 | a | 27.07 | a | 33.23 | 44.27 | a | 48.59 | a | 51.97 | 49.30 | a | 41.87 | 33.66 | b | 26.37 | c | 11.97 | a | 33.00 | ||||
1988 | 6.60 | a | 15.14 | 24.77 | 33.31 | a | 40.06 | 51.71 | b | 55.67 | a | 51.00 | 40.72 | a | 36.13 | 26.33 | 10.54 | c | 32.67 | |||||||
1989 | 1.57 | a | 6.50 | 29.07 | a | 36.70 | 39.45 | 46.37 | 56.70 | a | 52.32 | 42.86 | a | 33.17 | a | 24.23 | 14.23 | 31.93 | ||||||||
1990 | 16.42 | 13.96 | 28.90 | a | 37.96 | c | 38.97 | b | 47.39 | b | 55.00 | 52.16 | 48.96 | c | 32.32 | c | 25.96 | b | 3.89 | c | 33.49 | |||||
1991 | 6.32 | 16.64 | 28.23 | 32.20 | 38.71 | 47.45 | a | 54.03 | a | 54.90 | a | 44.34 | a | 32.06 | 25.73 | 9.74 | 32.53 | |||||||||
1992 | 3.61 | 20.28 | 31.55 | 37.17 | a | 44.03 | 49.83 | a | 52.23 | 53.42 | 42.07 | 35.10 | b | 19.00 | c | 8.00 | 33.02 | |||||||||
1993 | 7.55 | 11.54 | 24.84 | 33.43 | 45.52 | b | 45.30 | 46.58 | 49.77 | 40.83 | 33.17 | a | 14.79 | b | 14.84 | 30.68 | ||||||||||
1994 | 22.33 | a | 18.07 | 28.77 | a | 36.14 | a | 43.55 | 48.52 | a | 53.97 | 54.65 | 44.77 | 34.77 | 20.10 | 18.90 | 35.38 | |||||||||
1995 | 20.58 | 24.07 | 29.74 | 32.10 | a | 41.60 | a | 45.72 | a | 52.37 | a | 50.90 | 44.47 | 29.52 | 29.17 | a | 24.03 | a | 35.36 | |||||||
1996 | 19.77 | 15.11 | a | 26.83 | a | 33.31 | a | 41.61 | 49.30 | 54.63 | a | 51.10 | 42.24 | a | 34.30 | a | 27.45 | a | 22.93 | d | 34.88 | |||||
1997 | 18.90 | b | 18.57 | 27.82 | c | 32.17 | 44.10 | 50.38 | a | 52.65 | 55.00 | a | 48.61 | b | 33.03 | b | 25.79 | a | 8.72 | b | 34.64 | |||||
1998 | 20.79 | c | 26.96 | c | 26.83 | b | 34.76 | a | 41.48 | 45.46 | b | 57.13 | 54.53 | a | 49.23 | 34.77 | a | 29.00 | c | 12.89 | d | 36.15 | ||||
1999 | 21.70 | a | 19.91 | e | 28.03 | b | 32.03 | 39.87 | 48.50 | 53.61 | 53.48 | 40.97 | a | 29.52 | 25.32 | b | 15.27 | a | 34.02 | |||||||
2000 | 22.86 | b | 26.68 | a | 26.69 | b | 35.48 | c | 42.42 | 47.28 | a | 53.48 | 54.74 | 42.38 | a | 35.10 | b | 20.29 | b | 16.07 | c | 35.29 | ||||
2001 | 3.93 | a | 14.26 | a | 27.55 | 33.79 | a | 42.07 | a | 47.50 | 55.19 | 53.50 | a | 44.57 | 32.10 | a | 26.86 | a | 9.57 | a | 32.57 | |||||
2002 | 10.17 | a | -0.18 | 19.65 | 34.60 | 39.77 | a | 48.63 | 57.26 | 49.58 | 46.17 | a | 30.81 | 22.60 | 21.97 | b | 31.75 | |||||||||
2003 | 25.47 | a | 18.79 | 28.38 | b | 33.59 | a | 41.20 | a | 48.97 | 56.45 | b | 57.48 | 41.93 | a | 34.48 | 23.60 | 23.71 | 36.17 | |||||||
2004 | 4.93 | a | 11.93 | a | 27.77 | 37.67 | i | 41.48 | 49.33 | 55.68 | 51.68 | 43.27 | 35.90 | 23.83 | 19.03 | b | 33.17 | a | ||||||||
2005 | 17.19 | 8.32 | 23.90 | 34.63 | 42.87 | a | 46.40 | 55.13 | 53.87 | a | 41.67 | 34.23 | 26.59 | a | 17.52 | d | 33.53 | |||||||||
2006 | 20.11 | c | 15.19 | b | 27.81 | 35.67 | 42.37 | a | 50.40 | 58.77 | 51.03 | 41.63 | c | 32.48 | 25.96 | b | 17.39 | 34.90 | ||||||||
2007 | 8.29 | 21.32 | c | 25.57 | c | 33.34 | a | 37.93 | c | 48.12 | f | 59.55 | b | 56.04 | d | 44.25 | f | 32.17 | h | 23.68 | k | 21.80 | p | 34.58 | e | |
2008 | 5.12 | g | 14.19 | c | 21.17 | a | 27.33 | 39.62 | b | 46.89 | b | 55.64 | c | 52.63 | a | 42.40 | 32.94 | 28.03 | 15.30 | d | 34.20 | a | ||||
2009 | 13.97 | 13.75 | 23.60 | a | 34.34 | a | 43.20 | a | 49.48 | g | 54.97 | b | 51.10 | 46.47 | 31.42 | 21.93 | 7.74 | 31.14 | a | |||||||
2010 | 12.16 | 15.46 | 25.65 | 33.00 | a | 37.42 | 48.41 | a | 55.13 | a | 52.35 | 40.97 | 36.94 | 24.90 | 21.03 | 33.62 | ||||||||||
2011 | 13.07 | b | 16.36 | 26.32 | 32.20 | 39.55 | 46.70 | 56.42 | 55.42 | 46.23 | 35.61 | 23.17 | 13.58 | 33.72 | ||||||||||||
2012 | 18.35 | 23.14 | 29.03 | 36.12 | f | 40.55 | b | 47.17 | a | 57.90 | 55.00 | 44.41 | a | 32.70 | a | 27.33 | 19.71 | 35.94 | a | |||||||
2013 | 1.35 | 9.61 | 24.94 | 32.13 | 41.00 | b | 49.10 | 57.84 | 55.10 | 49.40 | 31.65 | 25.92 | d | 8.35 | 32.20 | |||||||||||
2014 | 10.61 | 25.00 | 29.58 | 32.10 | 42.65 | 46.93 | 57.42 | 53.32 | 47.67 | 35.26 | 23.07 | 24.03 | 35.64 | |||||||||||||
2015 | 19.97 | 25.89 | 28.52 | 32.77 | 43.39 | 52.43 | 54.58 | 55.84 | 50.03 | 44.32 | l | 24.70 | 14.68 | 36.62 | a | |||||||||||
2016 | 13.97 | 17.52 | 31.10 | 38.27 | 41.48 | 51.43 | 55.27 | i | 45.50 | w | 44.17 | 37.42 | 28.07 | 15.32 | 31.87 | b | ||||||||||
2017 | 7.97 | 23.39 | 31.84 | 33.73 | 40.77 | 50.17 | 58.45 | 53.35 | 45.37 | 29.16 | 28.83 | 14.19 | 34.77 | |||||||||||||
2018 | 19.29 | 21.82 | 25.94 | 35.10 | 43.84 | 48.10 | 56.32 | 52.55 | 42.17 | 35.32 | 23.17 | 15.35 | 34.91 | |||||||||||||
2019 | 14.68 | 19.04 | 27.29 | 37.70 | 41.16 | 47.50 | 55.87 | 52.35 | 44.73 | 26.23 | 23.53 | 14.97 | 33.75 | |||||||||||||
2020 | 18.97 | 14.55 | 29.16 | 32.60 | 41.87 | 48.27 | 53.26 | 54.77 | 41.00 | 31.19 | 24.17 | 11.61 | 33.45 | |||||||||||||
2021 | 15.65 | 24.14 | 25.68 | 30.97 | 41.58 | 55.03 | 60.03 | 52.61 | 43.90 | 35.52 | 29.07 | 20.10 | 36.19 | |||||||||||||
2022 | 12.00 | 13.29 | 26.26 | 30.13 | 38.00 | 46.70 | 56.94 | 56.32 | 45.87 | 31.55 | 20.17 | 15.03 | 32.69 | |||||||||||||
2023 | 16.06 | 6.29 | 18.94 | 28.87 | 44.81 | 47.13 | 56.35 | 56.65 | 44.63 | 34.48 | 23.97 | 20.80 | a | 33.25 | ||||||||||||
2024 | 18.32 | 23.00 | 28.96 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.43 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 12.80 | 17.06 | 25.80 | 33.14 | 41.06 | 48.03 | 54.81 | 52.85 | 43.63 | 33.06 | 24.60 | 15.31 | 33.53 | |||||||||||||
S.D. | 6.64 | 6.78 | 4.28 | 2.37 | 2.46 | 2.31 | 2.40 | 2.71 | 2.83 | 2.59 | 3.14 | 4.92 | 1.50 | |||||||||||||
SKEW | -0.15 | -0.47 | -1.55 | 0.04 | 0.03 | 0.31 | -0.49 | -0.30 | 0.51 | 0.06 | -0.73 | 0.09 | -0.33 | |||||||||||||
MAX | 25.47 | 28.60 | 32.74 | 38.59 | 47.43 | 55.03 | 60.03 | 60.19 | 50.03 | 39.61 | 29.37 | 24.43 | 36.19 | |||||||||||||
MIN | -1.29 | -0.18 | 12.07 | 27.33 | 34.94 | 43.10 | 46.58 | 45.10 | 38.52 | 26.23 | 14.79 | 3.89 | 29.90 | |||||||||||||
YRS | 64 | 65 | 66 | 62 | 64 | 63 | 62 | 65 | 65 | 63 | 64 | 65 | 49 |