YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.47 | o | 44.97 | 32.33 | 29.68 | 35.66 | i | |||
1959 | 23.11 | 26.25 | 33.97 | 43.82 | 52.50 | a | 63.91 | a | 66.69 | 64.94 | 54.37 | 42.15 | 32.48 | 24.10 | 44.02 | |||||||||||
1960 | 18.39 | 15.59 | 33.32 | 44.77 | 51.52 | a | 61.60 | 67.18 | 63.92 | 56.92 | 44.45 | 32.08 | 21.21 | 42.58 | ||||||||||||
1961 | 20.10 | 29.11 | 33.69 | 42.38 | 52.62 | a | 63.30 | 67.00 | 67.21 | 51.09 | b | 42.24 | 28.05 | 18.69 | 42.96 | |||||||||||
1962 | 8.31 | 25.54 | 25.58 | 45.97 | 52.47 | 60.32 | ----- | z | 59.12 | s | 56.43 | 46.21 | 35.45 | 22.60 | 37.89 | b | ||||||||||
1963 | 11.69 | 31.70 | 32.29 | 42.88 | 55.40 | 60.40 | 68.00 | 66.24 | 59.20 | 49.02 | 33.68 | 19.66 | 44.18 | |||||||||||||
1964 | 13.32 | 14.21 | 22.03 | 41.52 | 51.71 | 58.58 | 69.16 | 63.55 | 55.08 | 45.26 | 28.05 | 21.13 | a | 40.30 | ||||||||||||
1965 | 18.63 | 20.80 | a | 23.33 | a | 43.77 | d | 50.48 | 57.87 | 65.42 | 62.39 | 49.42 | 45.61 | 37.32 | 22.35 | 41.45 | ||||||||||
1966 | 17.39 | 20.05 | 33.29 | 41.48 | 53.74 | 60.42 | 68.74 | 63.77 | 57.98 | 42.89 | 35.80 | 14.32 | 42.49 | |||||||||||||
1967 | 20.06 | 23.57 | 38.00 | 42.82 | 49.82 | 57.63 | 67.02 | 65.34 | 54.58 | l | 46.10 | 31.62 | a | 12.97 | 41.36 | a | ||||||||||
1968 | 11.05 | a | 20.97 | 32.37 | 37.17 | 48.55 | 59.92 | 65.47 | 59.74 | b | ----- | z | 46.74 | f | 29.25 | 19.26 | 38.37 | b | ||||||||
1969 | 27.12 | a | 23.23 | 25.95 | 44.50 | c | 55.21 | 56.43 | 65.69 | 65.26 | 59.43 | 38.24 | 29.24 | a | 22.48 | 42.73 | ||||||||||
1970 | 20.47 | 31.62 | 30.94 | 38.67 | 52.42 | 59.88 | 66.55 | 67.42 | 53.20 | 38.61 | 34.12 | 23.90 | a | 43.15 | ||||||||||||
1971 | 24.42 | 24.29 | 31.71 | 41.85 | 50.23 | 61.43 | a | 68.52 | 69.32 | 49.73 | j | 42.26 | 29.60 | a | 18.34 | 42.00 | a | |||||||||
1972 | 23.06 | 27.45 | a | 40.02 | b | 43.85 | 51.03 | 62.88 | 65.62 | b | 65.07 | b | 56.05 | 46.02 | 29.35 | 11.00 | f | 46.40 | a | |||||||
1973 | 8.68 | c | 13.81 | a | 29.98 | 37.84 | b | 50.65 | e | 58.52 | a | 66.00 | r | 65.40 | e | 54.35 | 45.50 | o | ----- | z | ----- | z | 39.91 | d | ||
1974 | 19.50 | n | 13.43 | a | 35.73 | c | 40.87 | 52.63 | 61.68 | 67.16 | 61.91 | c | 53.83 | a | ----- | z | ----- | z | ----- | z | 48.40 | d | ||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.82 | h | 47.26 | 33.28 | 27.65 | 36.06 | i | |||
1978 | 24.71 | 27.88 | 39.75 | a | 46.40 | 52.67 | d | 61.77 | 67.88 | a | 64.26 | b | 56.53 | a | 45.67 | a | 27.66 | b | 9.15 | 43.69 | ||||||
1979 | 8.86 | b | 20.67 | b | 33.02 | a | 42.12 | b | 50.39 | 60.00 | 64.73 | c | 63.27 | a | 57.55 | a | 45.16 | 21.95 | b | 18.40 | 40.51 | |||||
1980 | 21.12 | a | 22.45 | 32.73 | a | 43.02 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.83 | h | |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | 33.58 | a | 39.87 | g | 46.16 | 56.27 | 65.05 | 68.31 | b | 56.00 | c | 44.48 | b | 29.39 | c | 14.58 | f | 49.91 | d | |||
1984 | 2.15 | a | 9.41 | b | 27.23 | a | 37.32 | h | 51.93 | a | 56.83 | a | 67.73 | e | 64.67 | b | 53.27 | j | 36.29 | g | 32.17 | c | 14.52 | b | 36.29 | c |
1985 | 12.39 | c | 11.75 | f | 30.55 | b | 44.34 | e | 51.50 | i | 60.64 | b | 68.37 | a | 62.03 | p | 47.98 | c | 42.18 | c | 29.76 | c | 17.44 | d | 39.30 | c |
1986 | 21.46 | c | 29.19 | a | 38.64 | b | 43.98 | g | 49.29 | e | 62.09 | b | 65.14 | b | 65.09 | c | 46.56 | v | 43.87 | h | 32.50 | 22.90 | b | 42.92 | c | |
1987 | 14.07 | d | 29.46 | a | 30.17 | a | 46.38 | e | 53.76 | b | 61.10 | y | 64.79 | 61.89 | 54.93 | c | 45.62 | b | 32.80 | c | 18.16 | f | 43.39 | b | ||
1988 | 10.17 | b | 18.09 | b | 31.44 | 43.65 | c | 52.08 | 66.58 | f | 69.44 | 66.05 | ----- | z | 48.44 | 32.70 | 17.60 | 38.96 | b | |||||||
1989 | 12.35 | 10.26 | a | 36.29 | 46.61 | c | 52.00 | a | 59.64 | a | 69.46 | h | 64.78 | k | 55.55 | a | 44.13 | a | 32.37 | 17.39 | 36.66 | b | ||||
1990 | 22.50 | a | 19.00 | 35.48 | 46.93 | 50.55 | ----- | z | 65.25 | i | 64.86 | c | 60.30 | c | 45.02 | g | 31.22 | 10.94 | 37.97 | c | ||||||
1991 | 11.61 | 22.39 | a | 32.55 | 40.44 | d | 51.23 | 60.58 | 66.97 | 66.62 | e | 54.06 | e | 43.82 | 28.14 | a | 17.11 | 41.29 | ||||||||
1992 | 12.00 | 27.62 | 38.23 | a | 47.88 | a | 56.43 | d | 59.68 | b | 64.20 | a | 64.48 | f | 56.02 | 46.81 | 26.47 | a | 15.18 | f | 43.53 | b | ||||
1993 | 15.23 | e | 16.58 | c | 32.60 | b | 41.16 | a | 53.15 | 58.23 | b | 62.39 | 62.98 | b | 54.18 | 43.60 | a | 23.38 | b | 18.60 | a | 40.17 | ||||
1994 | 19.77 | 20.00 | 37.08 | a | 43.73 | 54.10 | 62.95 | a | 68.02 | 67.94 | g | 56.33 | l | 44.12 | a | 24.48 | 21.54 | f | 41.58 | c | ||||||
1995 | 21.21 | 30.75 | 37.15 | 40.66 | b | 48.34 | 57.15 | 65.00 | d | 66.93 | b | 57.09 | b | 41.88 | b | 34.95 | a | 26.98 | b | 44.01 | ||||||
1996 | 18.62 | a | 20.34 | a | 33.85 | 41.98 | d | 52.60 | a | 59.77 | j | 67.73 | a | 65.61 | d | 54.24 | e | 37.94 | g | 31.08 | e | 24.02 | a | 41.01 | b | |
1997 | 17.91 | b | 21.29 | 34.92 | 37.16 | e | 51.40 | a | 61.31 | f | 65.58 | f | 64.65 | g | 56.41 | g | 42.84 | f | 30.37 | c | 17.79 | 30.12 | e | |||
1998 | 27.02 | 29.67 | b | 31.44 | g | 40.69 | c | 51.58 | g | 55.81 | f | 68.57 | b | 65.61 | d | 61.62 | d | 44.60 | 34.78 | a | 18.31 | d | 43.43 | c | ||
1999 | 26.26 | 28.95 | f | 37.18 | 39.78 | a | 48.84 | 55.55 | i | 66.90 | b | 64.72 | b | 51.60 | e | 40.88 | f | 34.30 | 19.77 | a | 43.26 | c | ||||
2000 | 26.16 | c | 31.00 | 34.54 | f | 44.28 | 52.30 | f | 60.08 | d | 68.56 | f | 67.79 | b | 52.82 | h | 43.44 | 17.40 | 17.17 | b | 38.42 | d | ||||
2001 | 12.32 | 21.36 | 35.61 | 43.40 | 51.72 | b | 60.67 | 68.85 | 67.36 | c | 57.38 | e | 43.93 | a | 33.48 | 15.26 | 42.61 | |||||||||
2002 | 15.31 | 14.11 | 25.82 | 44.18 | 49.05 | j | 62.60 | j | 70.13 | 63.77 | 56.32 | 40.55 | i | 26.77 | 22.31 | 37.63 | c | |||||||||
2003 | 21.14 | b | 23.23 | 33.81 | 44.02 | f | 50.84 | c | 59.02 | e | 70.68 | 67.36 | c | 53.65 | 45.70 | c | 25.69 | d | 22.27 | 43.03 | a | |||||
2004 | 15.85 | a | 21.85 | f | 38.40 | a | 45.70 | j | 52.07 | c | 59.22 | a | 65.44 | 62.52 | a | 55.30 | 46.02 | i | 31.87 | 23.24 | 44.88 | c | ||||
2005 | 28.50 | c | 24.29 | 34.52 | a | 41.92 | 51.06 | 57.33 | 67.43 | a | 63.25 | c | 54.78 | 46.19 | d | 32.38 | b | 20.52 | a | 43.51 | ||||||
2006 | 23.47 | 22.71 | b | 31.21 | 43.78 | a | 52.10 | b | 63.13 | 69.97 | 64.79 | b | 51.98 | 41.59 | i | 32.83 | 17.42 | 43.04 | a | |||||||
2007 | 5.32 | a | 24.59 | 36.24 | 42.30 | 52.37 | 60.94 | c | 70.21 | 67.79 | b | 57.30 | 44.58 | 32.62 | 12.77 | a | 42.25 | |||||||||
2008 | 9.21 | 17.90 | 25.68 | 35.62 | 46.90 | 57.66 | n | 66.63 | 64.60 | 54.15 | 43.38 | a | 33.60 | a | 17.38 | c | 37.73 | a | ||||||||
2009 | 14.35 | k | 26.09 | 32.27 | c | 38.97 | 51.85 | 57.60 | a | 65.64 | b | 63.10 | a | 57.13 | 39.35 | 29.12 | 10.42 | 42.87 | a | |||||||
2010 | 13.45 | 15.07 | 31.43 | a | 40.12 | d | 46.03 | 59.30 | c | 66.09 | c | 63.54 | g | 56.18 | 46.97 | 28.43 | 23.81 | 38.81 | a | |||||||
2011 | 10.58 | 14.04 | 31.97 | a | 39.42 | 46.55 | 58.14 | a | 66.31 | 66.58 | 56.42 | 43.65 | 29.78 | 16.31 | 39.98 | |||||||||||
2012 | 22.98 | 25.91 | 37.87 | 45.12 | 52.73 | 64.22 | 68.97 | a | 66.21 | 56.43 | 42.82 | 34.82 | 20.16 | 44.85 | ||||||||||||
2013 | 3.47 | 18.29 | 31.39 | 37.97 | 52.10 | 61.65 | 69.26 | 66.92 | 58.88 | 41.26 | 30.20 | 11.34 | 40.23 | |||||||||||||
2014 | 18.53 | 26.34 | 35.00 | 41.02 | 51.13 | 58.75 | 68.16 | 63.10 | 56.95 | 45.90 | 28.72 | 25.00 | 43.22 | |||||||||||||
2015 | 23.84 | 31.38 | 37.52 | 41.75 | 49.35 | 63.62 | 65.32 | 64.79 | 58.45 | 48.47 | a | 29.37 | 13.50 | 43.95 | ||||||||||||
2016 | 10.18 | 18.38 | 33.47 | 42.78 | 49.52 | 63.07 | 66.55 | 63.40 | 55.53 | 46.90 | 36.03 | 19.05 | 42.07 | |||||||||||||
2017 | 12.56 | 27.75 | 38.56 | 41.28 | 49.21 | 61.65 | 67.82 | 64.00 | 56.13 | 40.15 | 37.05 | 23.56 | 43.31 | |||||||||||||
2018 | 22.23 | 30.50 | j | 36.62 | s | 43.00 | 53.61 | 64.12 | e | 70.48 | 65.00 | 59.02 | 42.85 | 27.78 | 20.15 | 46.82 | b | |||||||||
2019 | 15.37 | 17.79 | 27.84 | 44.23 | 47.27 | 58.47 | 67.82 | 66.10 | 58.45 | 34.82 | 31.52 | 21.97 | 40.97 | |||||||||||||
2020 | 16.87 | 15.38 | 33.98 | 39.92 | 53.58 | 60.92 | 66.55 | 67.97 | 54.83 | 40.81 | 33.48 | 17.05 | a | 41.78 | ||||||||||||
2021 | 16.89 | 21.96 | 34.26 | 40.42 | 51.75 | a | 63.70 | 71.10 | 65.05 | a | 58.48 | 44.15 | 37.25 | 23.18 | 44.01 | |||||||||||
2022 | 14.16 | 15.14 | 29.45 | 40.88 | 48.98 | 61.03 | 69.75 | a | 67.00 | 59.87 | 43.73 | 26.32 | 12.56 | 40.74 | ||||||||||||
2023 | 16.23 | 8.09 | 20.37 | 35.20 | 53.15 | 58.77 | 68.26 | 66.53 | 55.95 | 44.47 | 30.97 | a | 22.48 | 40.04 | ||||||||||||
2024 | 20.90 | 28.02 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.46 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.91 | 21.88 | 32.83 | 42.08 | 51.27 | 60.32 | 67.33 | 65.14 | 55.89 | 43.99 | 30.84 | 19.22 | 42.31 | |||||||||||||
S.D. | 6.23 | 6.10 | 4.41 | 2.80 | 2.26 | 2.17 | 1.87 | 1.92 | 2.66 | 2.74 | 3.81 | 4.51 | 1.48 | |||||||||||||
SKEW | -0.22 | -0.24 | -0.77 | -0.31 | -0.41 | 0.06 | -0.08 | -0.24 | -0.59 | -0.89 | -0.88 | -0.17 | -0.18 | |||||||||||||
MAX | 28.50 | 31.70 | 40.02 | 47.88 | 56.43 | 64.22 | 71.10 | 69.32 | 61.62 | 49.02 | 37.32 | 29.68 | 44.85 | |||||||||||||
MIN | 2.15 | 8.09 | 20.37 | 35.20 | 46.03 | 56.27 | 62.39 | 59.74 | 47.98 | 34.82 | 17.40 | 9.15 | 39.98 | |||||||||||||
YRS | 58 | 56 | 57 | 55 | 55 | 50 | 53 | 52 | 50 | 49 | 59 | 54 | 29 |