YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.26 | 48.10 | 42.68 | 30.00 | a | 22.58 | 39.92 | g | ||||
1963 | 8.39 | 24.92 | b | 26.77 | 35.20 | 45.77 | 53.00 | 59.62 | e | 55.13 | 51.37 | 44.42 | 27.97 | 16.97 | 37.46 | |||||||||||
1964 | 18.32 | 15.66 | 20.32 | 32.30 | 43.23 | 49.07 | 58.70 | a | 52.94 | 45.50 | 36.90 | 26.23 | 18.83 | b | 34.83 | |||||||||||
1965 | 22.87 | 15.39 | 13.23 | 37.00 | 43.29 | 50.70 | 58.10 | 54.94 | 41.13 | 42.68 | 32.93 | 26.13 | 36.53 | |||||||||||||
1966 | 17.71 | 17.68 | 29.39 | 31.63 | 45.48 | 51.43 | 60.81 | 54.77 | 49.87 | 37.03 | 28.67 | 19.29 | 36.98 | |||||||||||||
1967 | 22.26 | 21.43 | 29.32 | 33.37 | 39.55 | 48.63 | 56.90 | 54.84 | 48.33 | 39.42 | 26.67 | 16.13 | 36.40 | |||||||||||||
1968 | 19.35 | 23.48 | 27.61 | 30.47 | 39.63 | a | 51.20 | 56.20 | a | 54.19 | 45.60 | 37.97 | 24.93 | 18.97 | 35.80 | |||||||||||
1969 | 22.90 | 22.79 | 19.90 | 37.47 | 46.90 | 48.53 | 59.61 | 58.62 | b | 50.63 | 28.90 | 26.21 | a | 23.06 | 37.13 | |||||||||||
1970 | 18.71 | 26.18 | 22.65 | 31.52 | a | 44.93 | a | 51.50 | 58.94 | 60.45 | 45.70 | 34.23 | 26.38 | a | 20.57 | a | 36.81 | |||||||||
1971 | 22.90 | 19.25 | 25.32 | c | 31.48 | i | 41.10 | 53.47 | 56.55 | 58.06 | 43.21 | a | 37.00 | 25.97 | 18.70 | a | 36.50 | a | ||||||||
1972 | 16.23 | e | 21.43 | a | 32.14 | c | 34.69 | a | 43.37 | a | 53.33 | 55.52 | 56.65 | 48.45 | a | 36.97 | a | 21.97 | 13.71 | 36.20 | ||||||
1973 | 15.23 | 21.64 | 27.32 | 27.72 | a | 39.81 | 53.03 | a | 55.69 | b | 58.16 | 45.03 | 39.86 | b | 26.89 | c | 21.32 | c | 35.98 | |||||||
1974 | 15.20 | a | 20.52 | c | 28.00 | a | 33.97 | 45.00 | b | 53.47 | 59.06 | 53.38 | b | 43.80 | 38.52 | 27.60 | 19.45 | b | 36.50 | |||||||
1975 | 16.96 | e | 16.48 | e | 23.83 | a | 28.93 | a | 40.24 | b | 50.00 | 58.41 | b | 56.42 | 42.59 | a | 38.40 | a | 23.89 | b | 23.14 | c | 34.94 | |||
1976 | 17.61 | c | 26.19 | c | 23.66 | b | 33.45 | a | 41.71 | c | 50.87 | 58.41 | b | 54.58 | 46.77 | 34.06 | 26.50 | 22.93 | c | 36.39 | ||||||
1977 | 14.61 | c | 26.36 | 25.77 | 38.50 | b | 44.87 | 57.07 | 59.32 | 55.79 | b | 51.93 | 39.58 | 29.03 | 24.14 | b | 38.91 | |||||||||
1978 | 14.24 | b | 20.26 | a | 29.18 | c | 37.00 | b | 43.03 | 52.83 | 59.87 | 55.03 | 50.07 | 38.62 | e | 26.70 | 15.04 | c | 36.82 | |||||||
1979 | 7.87 | a | 22.40 | c | 28.94 | 36.33 | 42.26 | 52.90 | 58.77 | 56.48 | 53.03 | 40.13 | 22.53 | 22.81 | 37.04 | |||||||||||
1980 | 15.28 | b | 23.41 | 25.38 | b | 34.40 | 43.25 | c | 56.03 | 62.06 | 59.45 | b | 49.97 | a | 38.10 | 30.10 | 28.27 | e | 38.81 | |||||||
1981 | 24.23 | 21.93 | 28.03 | 41.87 | 42.84 | 54.62 | a | 61.52 | b | 55.17 | b | 50.23 | 36.16 | 29.80 | 21.10 | 38.96 | ||||||||||
1982 | 16.10 | a | 17.72 | c | 26.61 | c | 30.85 | d | 38.80 | a | 47.59 | a | 56.70 | a | 56.93 | c | 47.00 | a | 32.10 | b | 20.79 | b | 19.97 | 34.26 | ||
1983 | 22.20 | a | 24.62 | b | 25.27 | a | 30.31 | a | 36.53 | a | 46.73 | 58.33 | a | 59.32 | 48.14 | a | 37.10 | a | 26.74 | g | 9.62 | e | 36.20 | a | ||
1984 | 17.54 | e | 21.00 | d | 24.45 | 30.23 | 42.83 | b | 49.53 | 57.19 | 57.70 | a | 46.45 | a | 32.41 | b | 25.67 | c | 19.21 | b | 35.35 | |||||
1985 | 14.71 | g | 14.21 | 27.34 | b | 35.63 | c | 45.26 | 51.93 | 57.58 | 54.43 | a | 45.21 | a | 34.64 | c | 18.71 | b | 15.76 | b | 36.43 | a | ||||
1986 | 26.83 | b | 21.32 | c | 33.68 | c | 34.54 | b | 40.79 | c | 53.36 | b | 56.70 | a | 55.13 | a | 44.57 | b | 35.90 | b | 26.12 | f | 19.24 | b | 38.37 | a |
1987 | 20.43 | c | 23.63 | a | 24.97 | b | 33.93 | b | 43.97 | 52.33 | c | 56.72 | b | 54.07 | d | 46.29 | b | 34.46 | c | 28.10 | a | 18.70 | a | 36.47 | ||
1988 | 12.19 | e | 20.30 | b | 25.71 | c | 33.92 | d | 44.43 | a | 57.64 | b | 57.93 | a | 57.00 | b | 46.28 | a | 36.30 | a | 26.97 | 20.00 | a | 36.56 | ||
1989 | 16.85 | e | 9.57 | 27.58 | 35.41 | a | 42.16 | 47.40 | 57.84 | 53.56 | d | 46.89 | b | 35.42 | 24.77 | 12.39 | 34.15 | |||||||||
1990 | 20.15 | e | 17.43 | 23.39 | 31.97 | 40.52 | 54.37 | 55.94 | 55.42 | 52.40 | 34.94 | 29.67 | 11.97 | b | 35.68 | |||||||||||
1991 | 17.46 | g | 26.50 | d | 29.47 | a | 33.17 | 43.23 | 53.37 | 58.13 | 56.97 | 45.43 | 35.19 | 23.89 | c | 20.48 | 38.71 | a | ||||||||
1992 | 21.92 | e | 28.31 | c | 32.29 | c | 38.57 | g | 46.03 | b | 49.23 | 55.97 | 53.16 | f | 47.80 | e | 37.43 | c | 22.21 | f | 16.92 | e | 37.32 | c | ||
1993 | 14.89 | d | 18.59 | f | 29.00 | f | 33.96 | e | 43.96 | d | 48.96 | c | 54.19 | d | 54.93 | c | 44.28 | e | 35.17 | h | 22.41 | c | 20.59 | d | 37.57 | c |
1994 | 21.36 | f | 17.83 | d | 30.15 | d | 34.77 | d | 47.63 | a | 56.93 | b | 56.95 | k | 57.46 | c | 51.96 | b | 36.60 | a | 24.56 | c | 23.55 | 38.14 | b | |
1995 | 18.69 | b | 24.82 | 27.00 | e | 31.07 | 38.90 | b | 50.00 | 56.35 | 58.41 | b | 46.87 | 34.00 | b | 27.65 | d | 21.39 | c | 36.26 | ||||||
1996 | 13.38 | b | 20.07 | b | 21.97 | a | 34.77 | 43.48 | b | 51.87 | 57.41 | b | 54.06 | 44.04 | c | 36.03 | a | 24.44 | c | 20.33 | d | 35.16 | ||||
1997 | 15.04 | c | 18.61 | 25.82 | i | 27.36 | b | 41.31 | b | 50.53 | 56.00 | b | 53.68 | 49.21 | a | 33.65 | e | 22.81 | d | 16.82 | c | 35.00 | a | |||
1998 | 19.25 | c | 20.59 | a | 22.30 | a | 30.08 | d | 40.77 | e | 45.70 | g | 56.07 | d | 54.56 | f | 49.90 | a | 34.45 | b | 26.59 | a | 16.93 | c | 31.69 | b |
1999 | 20.17 | b | 23.20 | c | 24.83 | b | 29.30 | c | 37.79 | b | 48.21 | a | 56.54 | c | 53.93 | a | 40.42 | d | 33.24 | b | 29.22 | c | 19.86 | b | 34.73 | |
2000 | 19.84 | 23.21 | e | 26.55 | b | 32.26 | g | 43.57 | a | 51.92 | d | 59.62 | b | 58.00 | f | 44.42 | d | 35.62 | g | 16.72 | e | 12.37 | d | 33.14 | c | |
2001 | 16.25 | g | 15.50 | b | 25.61 | h | 33.85 | c | 41.83 | h | 53.48 | e | 60.54 | c | 56.79 | b | 47.65 | d | 34.00 | a | 28.15 | d | 19.04 | d | 38.78 | c |
2002 | 16.85 | d | 14.59 | f | 18.59 | d | 30.56 | e | 39.56 | d | 54.69 | d | 60.33 | a | 53.77 | a | 47.28 | a | 29.50 | c | 23.37 | c | 21.56 | d | 36.00 | a |
2003 | 21.50 | e | 12.63 | a | 27.38 | e | 34.00 | b | 43.11 | d | 48.48 | c | 61.07 | b | 58.59 | b | 42.52 | e | 39.28 | f | 23.34 | a | 19.76 | b | 35.67 | a |
2004 | 17.33 | d | 17.74 | b | 32.12 | f | 36.83 | 44.69 | b | 51.00 | 57.57 | a | 53.77 | 48.17 | a | 37.21 | b | 27.57 | 22.10 | 37.63 | a | |||||
2005 | 24.19 | 24.96 | 29.00 | d | 34.87 | 44.23 | 50.69 | a | 60.00 | a | 55.29 | 47.86 | a | 37.13 | 29.14 | a | 19.84 | 38.10 | ||||||||
2006 | 25.65 | 18.36 | 26.45 | 37.07 | 45.29 | 55.17 | 60.39 | 57.10 | 43.43 | 35.55 | 28.52 | a | 22.07 | a | 37.92 | |||||||||||
2007 | 12.84 | 17.00 | c | 31.28 | b | 32.74 | c | 44.07 | b | 51.97 | 60.00 | 58.13 | 49.17 | 38.23 | a | 27.33 | 16.83 | a | 36.63 | |||||||
2008 | 15.93 | b | 21.90 | 25.58 | 31.76 | a | 40.71 | 50.48 | a | 58.61 | 54.87 | a | 45.70 | 35.74 | 29.17 | a | 15.13 | a | 35.47 | |||||||
2009 | 22.90 | a | 23.86 | 27.65 | 31.97 | a | 44.58 | 49.67 | 54.39 | 54.47 | a | 46.90 | a | 29.77 | 28.70 | 12.97 | 35.65 | |||||||||
2010 | 18.61 | 16.48 | a | 26.13 | a | 35.21 | a | 39.71 | 52.62 | a | 57.96 | c | 57.29 | 48.79 | a | 38.33 | a | 24.80 | 21.72 | b | 36.47 | |||||
2011 | 18.03 | 8.33 | s | ----- | z | 34.10 | t | 39.70 | a | 52.89 | c | 60.97 | a | 60.80 | a | 49.70 | 37.27 | a | 27.57 | 17.55 | 40.50 | c | ||||
2012 | 24.55 | 18.38 | 33.90 | 39.87 | 45.61 | 57.83 | a | 62.00 | 58.48 | 50.37 | 36.13 | 29.90 | a | 20.55 | 39.80 | |||||||||||
2013 | 18.39 | 19.71 | 24.97 | 29.87 | 45.10 | 55.00 | 59.10 | 58.84 | 52.73 | 34.17 | a | 28.37 | 17.10 | 36.94 | ||||||||||||
2014 | 21.13 | 17.07 | 27.10 | a | 35.90 | 43.94 | 51.76 | a | 59.52 | 56.65 | 49.73 | 40.13 | 23.68 | e | 21.32 | 37.33 | ||||||||||
2015 | 22.35 | 22.61 | 31.52 | 36.40 | 41.77 | 55.80 | 58.23 | a | 57.42 | 50.03 | a | 35.13 | 26.40 | 20.68 | 38.20 | |||||||||||
2016 | 21.06 | 26.14 | 29.10 | a | 37.20 | 42.32 | 57.30 | 60.55 | 55.90 | 48.90 | 41.87 | 33.64 | b | 15.90 | 39.16 | |||||||||||
2017 | 20.45 | 29.15 | a | 33.90 | a | 36.00 | 42.26 | 54.40 | 60.19 | 55.84 | 49.38 | d | 37.52 | b | 30.90 | 16.81 | d | 38.90 | ||||||||
2018 | 22.31 | e | 17.89 | 29.35 | 33.24 | a | 47.83 | a | 57.03 | 60.16 | 57.31 | b | 51.43 | 37.60 | a | 27.27 | 22.35 | 38.65 | ||||||||
2019 | 20.70 | a | 17.22 | a | 25.35 | 37.43 | 40.06 | 52.17 | 60.55 | 59.68 | 52.90 | 31.52 | 24.67 | 23.77 | 37.17 | |||||||||||
2020 | 24.84 | 20.17 | 31.00 | a | 33.28 | a | 45.23 | 55.77 | 61.13 | 59.57 | a | 48.93 | 34.32 | 30.79 | b | 23.55 | b | 39.05 | ||||||||
2021 | 22.32 | 16.44 | a | 29.17 | b | 32.34 | a | 44.13 | 57.36 | b | 62.13 | 60.42 | 52.43 | 38.77 | a | 31.67 | 25.06 | 39.35 | ||||||||
2022 | 18.27 | a | 15.32 | 27.30 | a | 34.33 | 44.76 | f | 55.60 | 61.55 | b | 60.52 | b | 52.73 | 38.97 | a | 23.45 | a | 19.03 | 37.01 | a | |||||
2023 | 20.42 | 19.25 | 23.84 | 33.41 | a | 47.68 | 52.50 | 60.71 | 59.55 | 51.90 | 37.84 | 29.93 | 26.87 | 38.66 | ||||||||||||
2024 | 18.58 | 25.72 | 29.06 | 36.67 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.46 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.89 | 20.57 | 26.81 | 33.78 | 42.88 | 52.45 | 58.62 | 56.53 | 47.86 | 36.48 | 26.65 | 19.53 | 36.92 | |||||||||||||
S.D. | 3.96 | 4.04 | 3.81 | 2.93 | 2.55 | 2.85 | 2.00 | 2.12 | 3.12 | 3.09 | 3.25 | 3.73 | 1.47 | |||||||||||||
SKEW | -0.48 | -0.13 | -0.75 | 0.11 | -0.22 | 0.09 | -0.17 | 0.29 | -0.26 | -0.07 | -0.52 | -0.30 | 0.13 | |||||||||||||
MAX | 26.83 | 29.15 | 33.90 | 41.87 | 47.83 | 57.83 | 62.13 | 60.80 | 53.03 | 44.42 | 33.64 | 28.27 | 39.80 | |||||||||||||
MIN | 7.87 | 9.57 | 13.23 | 27.36 | 36.53 | 46.73 | 54.19 | 52.94 | 40.42 | 28.90 | 16.72 | 9.62 | 34.15 | |||||||||||||
YRS | 58 | 59 | 57 | 57 | 59 | 60 | 60 | 59 | 62 | 59 | 59 | 62 | 44 |