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 | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.48 | h | 56.67 | d | 45.73 | a | 31.80 | 2.23 | 34.11 | h | ||
1984 | 7.98 | d | 25.09 | a | 21.40 | b | 43.97 | a | 50.73 | a | 63.90 | a | 64.98 | 67.53 | 53.38 | a | 47.39 | d | 29.04 | d | 16.30 | h | 43.22 | a | ||
1985 | 7.38 | g | 9.40 | b | 30.65 | 46.45 | a | 57.44 | 58.56 | f | 65.14 | b | 62.06 | d | 55.54 | d | 42.81 | b | 22.39 | c | 1.96 | c | 39.38 | b | ||
1986 | 11.32 | c | 9.60 | c | 28.19 | e | 47.18 | b | 57.26 | 61.98 | 67.55 | b | 60.94 | 55.15 | f | 43.65 | a | 26.35 | f | 21.09 | h | 43.07 | c | |||
1987 | 15.04 | d | 24.14 | c | 33.08 | e | 46.35 | g | 57.38 | e | 65.34 | a | ----- | z | 62.55 | b | 55.31 | c | 35.43 | d | 30.16 | e | 19.57 | b | 39.80 | b |
1988 | 5.33 | g | 7.98 | f | 26.73 | e | 43.23 | d | 59.09 | c | 65.50 | e | 70.80 | c | 68.12 | b | 56.02 | c | 37.78 | b | 31.40 | d | 14.18 | c | 47.29 | b |
1989 | 13.86 | c | 2.37 | e | 22.28 | d | 39.43 | g | 55.00 | a | 61.40 | a | 69.42 | a | 64.86 | b | 55.71 | a | 45.21 | c | 25.20 | 3.03 | a | 38.03 | a | |
1990 | 18.40 | 13.18 | 29.60 | 42.35 | 51.02 | 63.45 | 66.13 | 64.82 | 57.78 | 42.76 | 33.52 | b | 15.80 | a | 41.57 | |||||||||||
1991 | 6.67 | a | 16.93 | a | 28.93 | b | 44.97 | a | 58.34 | 66.48 | 66.17 | a | 66.40 | 53.29 | b | 41.27 | c | 23.54 | b | 15.52 | a | 40.71 | ||||
1992 | 15.98 | a | 22.05 | a | 26.05 | 38.04 | b | 54.13 | a | 58.98 | 59.76 | 60.28 | a | 52.96 | b | 42.35 | 28.03 | 16.02 | 39.55 | |||||||
1993 | 7.47 | 12.98 | 24.53 | 35.90 | 51.29 | 57.70 | 64.31 | 64.29 | 48.48 | a | 38.98 | 24.97 | 17.45 | c | 37.36 | |||||||||||
1994 | -1.94 | 7.14 | 27.21 | b | 39.68 | 52.66 | b | 64.18 | e | 64.44 | f | 62.57 | c | 58.58 | e | 47.02 | e | 33.75 | f | 19.73 | g | 39.68 | c | |||
1995 | 12.23 | g | 11.31 | d | 26.52 | d | 33.55 | h | 50.55 | i | 65.68 | k | 68.05 | l | 68.98 | i | 53.90 | j | 45.75 | i | 19.80 | j | 10.16 | l | 18.92 | j |
1996 | 1.65 | h | 8.89 | j | 17.43 | j | 36.50 | i | 51.10 | j | 62.42 | l | 64.11 | i | 65.60 | j | 57.18 | k | 43.20 | i | 21.56 | l | 12.65 | k | ----- | z |
1997 | 7.64 | j | 18.35 | h | 24.00 | l | 37.52 | h | 45.45 | j | 63.67 | i | 65.17 | j | 60.77 | k | 56.95 | i | 43.91 | i | 23.71 | m | 25.31 | j | ----- | z |
1998 | 17.12 | j | 29.43 | h | 26.90 | j | 46.27 | j | 60.68 | l | 60.31 | i | 67.73 | i | 66.90 | j | 58.86 | h | 44.50 | j | 31.68 | k | 20.65 | k | ----- | z |
1999 | 4.76 | l | 21.95 | h | 26.72 | h | 44.71 | i | 54.42 | k | 60.77 | h | 68.77 | i | 62.82 | i | 53.95 | i | 41.83 | k | 35.58 | k | 20.32 | l | ----- | z |
2000 | 8.90 | j | 20.98 | h | 35.61 | i | 40.44 | m | 55.59 | i | 60.93 | h | 66.50 | k | 65.96 | h | 54.62 | j | 48.50 | i | 31.73 | j | 3.68 | l | ----- | z |
2001 | 14.75 | i | 8.13 | i | 23.38 | k | 41.87 | k | 54.95 | j | 62.83 | j | 66.53 | l | 67.14 | i | 55.69 | l | 43.93 | i | 39.40 | j | 25.07 | k | ----- | z |
2002 | 18.52 | j | 20.90 | h | 17.25 | m | 40.14 | h | 48.90 | j | 64.19 | n | 70.34 | l | 64.26 | j | 57.73 | j | 37.45 | j | 27.15 | m | 19.87 | l | ----- | z |
2003 | 7.88 | j | 5.78 | h | 24.34 | l | 39.71 | i | 50.95 | j | 60.66 | k | 63.83 | j | 67.74 | j | 55.76 | i | 42.30 | h | 30.36 | l | 21.05 | k | ----- | z |
2004 | 6.00 | k | 14.89 | j | 29.12 | j | 41.95 | j | 50.58 | m | 59.93 | h | 66.93 | j | 60.23 | k | 60.67 | i | 45.70 | k | 35.00 | k | 16.65 | n | ----- | z |
2005 | 10.97 | k | 17.90 | h | 21.50 | i | 47.18 | k | 51.16 | l | 66.60 | j | 68.58 | k | 65.98 | h | 58.45 | i | 47.10 | j | 33.90 | o | 13.67 | p | ----- | z |
2006 | 20.95 | k | 12.35 | h | 27.23 | k | 47.08 | l | 55.43 | b | 64.74 | a | 71.73 | 67.61 | 55.29 | a | 42.27 | a | 35.54 | b | 24.64 | b | 52.16 | d | ||
2007 | 16.81 | 8.42 | b | 31.57 | a | 40.94 | c | 58.08 | 66.32 | 68.15 | 67.29 | 59.70 | 51.47 | 31.86 | a | 13.15 | a | 42.81 | ||||||||
2008 | 10.95 | b | 8.33 | b | 22.11 | 40.78 | 50.30 | c | 62.65 | 67.88 | a | 65.82 | 58.95 | 45.84 | 32.41 | c | 9.92 | 39.66 | ||||||||
2009 | 1.79 | c | 16.57 | 27.71 | e | 40.75 | j | 53.81 | 61.42 | 62.32 | 63.94 | 61.48 | 40.98 | 38.93 | 16.05 | 40.45 | a | |||||||||
2010 | 13.35 | a | 16.52 | 36.02 | 49.62 | 57.34 | 64.28 | 70.85 | 70.65 | 55.98 | a | 49.13 | 33.27 | 16.18 | 44.43 | |||||||||||
2011 | 8.45 | 14.52 | 24.73 | 40.58 | 54.02 | 63.47 | 72.48 | 66.50 | 57.17 | 49.52 | 36.15 | 23.56 | 42.60 | |||||||||||||
2012 | 17.39 | 23.34 | 42.26 | 45.37 | 58.73 | 65.75 | 72.84 | 66.24 | 56.67 | 43.34 | 32.67 | 22.08 | 45.56 | |||||||||||||
2013 | 10.89 | 12.78 | a | 20.22 | b | 34.37 | 53.10 | 63.63 | 68.60 | 66.50 | 60.00 | 45.87 | 29.25 | 8.21 | 39.45 | |||||||||||
2014 | 1.34 | 2.77 | 18.21 | 38.27 | 56.11 | 65.83 | 65.80 | a | 66.94 | 57.37 | 45.73 | 23.07 | 21.77 | 38.60 | ||||||||||||
2015 | 11.69 | 3.48 | 29.31 | 44.28 | 56.06 | 64.38 | 68.29 | 65.16 | 64.23 | 47.82 | 37.52 | 29.95 | 43.52 | |||||||||||||
2016 | 12.37 | 18.86 | 35.95 | 43.17 | 56.58 | a | 66.03 | a | 69.56 | 68.84 | 62.20 | 50.15 | 41.38 | 17.85 | 45.25 | |||||||||||
2017 | 15.50 | 24.54 | 27.85 | 45.02 | 53.18 | 64.67 | 68.52 | 63.82 | 62.10 | 48.90 | 28.50 | 13.66 | 43.02 | |||||||||||||
2018 | 11.45 | 8.82 | 27.58 | 30.43 | 62.68 | 67.68 | 69.10 | 67.92 | 61.70 | 42.48 | 26.30 | 22.97 | 41.59 | |||||||||||||
2019 | 11.69 | 9.34 | 21.56 | 40.77 | 51.35 | 63.82 | 70.55 | 65.27 | 61.10 | 44.02 | 26.32 | 18.48 | 40.36 | |||||||||||||
2020 | 18.87 | 15.46 | a | 32.34 | 40.33 | 55.95 | 67.67 | 74.13 | 70.35 | 57.08 | 40.81 | 38.23 | 22.76 | 44.50 | ||||||||||||
2021 | 18.73 | 8.46 | 36.40 | 44.70 | 55.47 | 70.02 | 69.81 | 68.18 | 60.79 | a | 53.29 | 32.81 | a | 20.97 | 44.97 | |||||||||||
2022 | 4.53 | a | 8.57 | 25.92 | 37.08 | 56.81 | 64.15 | 68.60 | 66.95 | 59.80 | 46.82 | 33.42 | 15.75 | a | 40.70 | |||||||||||
2023 | 19.85 | 16.54 | 24.89 | 40.28 | a | 57.60 | 67.70 | 67.44 | 67.42 | 62.67 | 49.06 | 32.32 | 30.77 | 44.71 | ||||||||||||
2024 | 19.23 | 28.66 | 31.97 | 42.59 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.62 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.84 | 13.80 | 28.06 | 41.51 | 55.41 | 64.40 | 68.18 | 65.86 | 57.86 | 44.93 | 31.07 | 16.83 | 42.05 | |||||||||||||
S.D. | 5.85 | 7.07 | 5.38 | 4.32 | 2.94 | 2.62 | 3.22 | 2.57 | 3.53 | 4.13 | 4.98 | 7.36 | 2.44 | |||||||||||||
SKEW | -0.62 | 0.36 | 0.50 | -0.54 | 0.07 | -0.47 | -0.53 | -0.34 | -0.40 | -0.16 | 0.06 | -0.35 | -0.17 | |||||||||||||
MAX | 19.85 | 28.66 | 42.26 | 49.62 | 62.68 | 70.02 | 74.13 | 70.65 | 64.23 | 53.29 | 41.38 | 30.77 | 45.56 | |||||||||||||
MIN | -1.94 | 2.37 | 18.21 | 30.43 | 50.30 | 57.70 | 59.76 | 60.28 | 48.48 | 35.43 | 22.39 | 1.96 | 37.36 | |||||||||||||
YRS | 27 | 29 | 30 | 25 | 29 | 28 | 27 | 29 | 29 | 30 | 28 | 27 | 20 |