YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | 46.72 | 55.26 | 65.68 | 67.64 | b | 68.21 | b | 61.78 | 42.16 | 30.80 | 17.76 | 50.67 | c | |||||||
1953 | 11.66 | 17.18 | 27.08 | 37.23 | 53.08 | 63.75 | 68.28 | a | 70.23 | 58.25 | 52.07 | a | 34.33 | 17.31 | d | 42.54 | ||||||||||
1954 | -0.72 | a | 28.44 | a | 23.45 | 40.16 | b | 49.97 | 63.48 | a | 70.22 | a | 66.84 | 56.02 | 44.11 | 34.45 | 20.29 | 41.39 | ||||||||
1955 | 10.20 | a | 6.20 | a | 17.69 | 49.00 | 59.78 | b | 64.74 | a | 73.19 | 71.82 | 58.90 | 48.45 | 18.25 | 4.73 | 40.25 | |||||||||
1956 | 7.48 | a | 4.93 | 19.74 | 35.18 | 53.71 | 69.30 | 67.71 | 67.34 | 54.35 | 49.21 | 29.02 | 18.24 | 39.68 | ||||||||||||
1957 | 1.74 | j | 12.09 | 26.40 | 40.87 | 54.55 | 61.78 | 72.82 | 65.31 | 54.17 | a | 45.08 | 29.27 | 20.61 | 43.90 | a | ||||||||||
1958 | 15.39 | 12.05 | 29.11 | 44.25 | b | 56.56 | 58.38 | 65.31 | 68.92 | 57.85 | 47.27 | 30.82 | 11.40 | a | 41.44 | |||||||||||
1959 | 4.50 | 8.12 | 31.08 | 42.83 | 54.47 | 67.92 | 70.08 | 71.31 | 57.87 | 39.76 | 21.17 | a | 26.03 | 41.26 | ||||||||||||
1960 | 7.69 | 10.19 | 15.29 | 40.25 | 54.98 | 62.98 | 70.81 | 69.56 | 59.55 | 45.77 | 29.82 | 9.67 | d | 39.71 | ||||||||||||
1961 | 8.07 | a | 16.39 | 32.60 | 37.13 | 50.48 | 67.12 | 69.11 | 71.66 | 55.18 | 45.42 | a | 30.14 | a | 9.85 | a | 41.10 | |||||||||
1962 | 7.00 | g | 7.52 | 20.69 | 40.32 | 55.65 | 63.78 | 66.81 | 68.66 | 54.78 | 49.73 | 34.25 | 17.08 | 43.57 | a | |||||||||||
1963 | 2.50 | a | 10.81 | a | 30.13 | 46.15 | t | 53.52 | 68.02 | 71.87 | 69.18 | 60.75 | 55.65 | 33.87 | 6.90 | a | 42.11 | a | ||||||||
1964 | 14.66 | 18.55 | 18.05 | 42.38 | 57.75 | a | 63.83 | 72.65 | 65.52 | a | 54.52 | 45.61 | 28.59 | b | 3.19 | 40.44 | ||||||||||
1965 | -0.52 | 6.09 | a | 15.55 | 40.65 | 54.13 | 64.58 | 69.32 | 67.74 | 48.10 | a | 47.90 | 26.96 | b | 20.98 | b | 38.46 | |||||||||
1966 | -5.10 | 7.20 | 30.21 | 37.05 | 51.61 | 64.87 | 73.95 | 65.61 | 58.43 | 44.35 | a | 23.53 | a | 11.81 | 38.63 | |||||||||||
1967 | 9.82 | 4.64 | 27.13 | 37.55 | 49.11 | 62.32 | 67.89 | 66.30 | a | 59.22 | a | 43.13 | d | ----- | z | ----- | z | 42.71 | b | |||||||
1968 | ----- | z | 9.90 | 32.95 | 42.33 | 51.85 | a | 62.73 | 68.58 | 65.95 | 57.53 | ----- | z | 30.92 | 9.68 | c | 43.24 | b | ||||||||
1969 | -0.70 | a | 13.30 | 17.03 | b | 43.32 | 54.18 | c | 57.85 | 68.61 | 72.29 | 59.82 | 40.95 | b | 31.10 | a | 17.83 | b | 39.63 | |||||||
1970 | 0.47 | 13.54 | 17.47 | 40.07 | 50.03 | a | 66.59 | a | 74.68 | 67.73 | 58.93 | 47.39 | 27.22 | 8.75 | a | 39.40 | ||||||||||
1971 | 1.20 | c | 10.44 | c | 26.00 | 45.05 | 52.35 | 66.98 | 66.87 | 69.85 | 58.13 | 47.13 | ----- | z | ----- | z | 44.40 | b | ||||||||
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | 43.28 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.89 | 26.82 | 11.47 | 33.11 | h | ||||
1974 | 3.71 | 10.31 | a | 22.15 | 41.88 | 51.55 | a | 65.02 | 74.05 | 63.68 | 52.12 | 44.81 | 28.43 | 19.56 | 39.77 | |||||||||||
1975 | 11.33 | a | 7.43 | 17.05 | 32.20 | 54.18 | 63.57 | 72.08 | 66.71 | 55.50 | 47.81 | 32.95 | 15.90 | 39.73 | ||||||||||||
1976 | 8.98 | 24.05 | 25.39 | 46.53 | 56.32 | 68.65 | d | 71.58 | 72.15 | 59.63 | 39.80 | a | 23.26 | c | 8.73 | a | 42.09 | |||||||||
1977 | -2.92 | a | 19.37 | b | 31.60 | b | 48.82 | 64.95 | 67.16 | a | 71.03 | a | 61.89 | 57.14 | a | 45.72 | d | 25.35 | c | 8.80 | a | 41.58 | ||||
1978 | -3.19 | 5.21 | 25.19 | b | 40.91 | c | 58.52 | ----- | z | 70.31 | 69.08 | 63.38 | 45.00 | 22.12 | 8.53 | 36.82 | a | |||||||||
1979 | -6.07 | a | -2.34 | 19.72 | b | 33.29 | a | 48.47 | 63.45 | a | 71.39 | 65.50 | 60.36 | a | 42.90 | 23.95 | 20.81 | 36.79 | ||||||||
1980 | 7.23 | 10.90 | c | 20.55 | 48.33 | a | 61.37 | ----- | z | 70.28 | a | 65.12 | b | 55.80 | 42.85 | 33.25 | 14.04 | d | 39.07 | a | ||||||
1981 | 12.10 | 20.77 | 34.62 | b | 47.30 | b | 56.60 | 63.77 | 72.27 | 70.68 | 57.62 | 43.52 | a | 36.00 | 9.40 | a | 43.72 | |||||||||
1982 | -7.03 | a | 8.17 | b | 23.76 | 40.30 | b | 57.10 | a | 59.75 | 72.24 | b | 69.62 | a | 55.39 | c | 43.91 | c | 24.19 | c | 20.30 | a | 38.97 | |||
1983 | 16.64 | c | 20.29 | b | 28.08 | 38.70 | 50.00 | a | 65.40 | 75.27 | a | 74.82 | 58.52 | 44.05 | c | 30.86 | a | -1.84 | b | 41.73 | ||||||
1984 | 9.82 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.23 | 10.63 | a | 16.89 | i | |
1985 | 7.98 | b | 13.41 | 34.48 | 48.95 | 61.71 | 61.72 | a | 70.34 | 65.29 | 54.27 | 44.73 | 15.72 | 5.53 | a | 40.34 | ||||||||||
1986 | 15.52 | 11.39 | 34.31 | 42.31 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.41 | i | |||
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.75 | 66.47 | 66.38 | b | 54.14 | b | 44.10 | 25.93 | a | 15.05 | b | 47.69 | e | |||
1994 | -2.96 | d | 4.65 | a | 30.82 | a | 44.30 | 59.21 | c | 67.95 | b | 67.61 | c | 66.41 | b | 61.00 | 47.25 | c | 31.24 | a | 18.62 | a | 41.34 | |||
1995 | 8.54 | c | 13.48 | 26.74 | 37.61 | c | 53.63 | 68.64 | a | 69.52 | 71.00 | a | 58.50 | b | 44.40 | a | 23.88 | b | 12.98 | a | 40.74 | |||||
1996 | 2.48 | b | 14.38 | d | 18.80 | c | 38.53 | a | 54.02 | b | 67.66 | a | 67.52 | a | 69.30 | a | 59.63 | d | 45.29 | 17.29 | b | 6.11 | c | 38.42 | ||
1997 | 0.70 | d | 14.75 | b | 21.76 | b | 36.88 | a | 52.85 | d | 67.08 | 69.02 | a | 67.29 | 62.47 | a | 48.18 | a | 25.48 | d | 24.98 | a | 40.95 | |||
1998 | 11.60 | b | 26.96 | 25.37 | 49.21 | a | 59.79 | b | 61.95 | 70.34 | 71.61 | 63.63 | 47.77 | 29.86 | a | 20.74 | b | 44.90 | ||||||||
1999 | 4.76 | b | 22.50 | b | 31.85 | 45.53 | a | 57.77 | 64.87 | ----- | z | 67.54 | g | 56.81 | c | 46.89 | 38.88 | b | 26.66 | c | 39.65 | b | ||||
2000 | 12.68 | a | 23.67 | b | 37.03 | 45.10 | ----- | z | 63.88 | a | 70.68 | 69.26 | b | 58.34 | a | 48.94 | d | 26.80 | c | 1.33 | d | 41.61 | a | |||
2001 | 17.63 | a | 5.92 | c | 27.23 | 44.93 | b | 58.25 | a | 64.75 | b | ----- | z | 70.05 | 59.38 | a | 45.22 | b | ----- | z | 19.59 | b | 41.29 | b | ||
2002 | 18.47 | a | 25.89 | a | 19.22 | b | 40.70 | b | 52.48 | a | 69.48 | a | 73.77 | a | 68.02 | b | 63.50 | 37.35 | 30.28 | 22.43 | a | 43.47 | ||||
2003 | 10.16 | b | ----- | z | 25.77 | 45.82 | b | 55.56 | d | 64.76 | a | 71.13 | 73.08 | 59.08 | 50.05 | b | 25.43 | 21.37 | 45.66 | a | ||||||
2004 | 5.91 | c | 17.14 | 33.20 | a | 45.55 | a | 52.83 | a | 63.04 | b | 67.63 | a | 62.77 | 61.48 | b | 48.53 | a | 35.78 | 20.17 | e | 42.84 | ||||
2005 | 9.87 | 21.68 | c | 30.28 | f | 47.92 | e | 56.11 | 67.86 | b | 71.70 | a | 67.36 | c | 63.84 | a | 47.13 | a | 31.02 | b | 18.81 | e | 45.75 | a | ||
2006 | 23.71 | 11.98 | c | 28.62 | b | 50.93 | a | 58.61 | 68.59 | b | 74.27 | a | 68.80 | a | 58.78 | a | 44.30 | c | 32.75 | d | 27.26 | 45.72 | ||||
2007 | 14.48 | f | ----- | z | 33.34 | 42.87 | 60.79 | 69.28 | c | 73.40 | 67.15 | 61.38 | a | 48.40 | 30.60 | j | 9.72 | k | 57.08 | d | ||||||
2008 | 5.66 | i | 6.24 | j | 24.66 | l | 38.13 | k | 51.06 | f | 59.94 | d | 70.28 | b | 69.44 | 60.59 | g | 47.28 | a | 31.71 | a | 6.91 | n | 55.73 | g | |
2009 | 5.09 | h | 12.03 | h | 23.46 | f | 41.06 | e | 55.69 | d | 64.28 | g | 66.53 | b | 66.15 | d | 63.32 | e | 39.48 | i | 38.73 | f | 7.56 | o | 58.55 | g |
2010 | 11.50 | k | 10.79 | g | 34.27 | g | 51.12 | e | 55.89 | d | 66.23 | b | 71.94 | e | 71.12 | f | 56.25 | h | 49.69 | d | 32.21 | i | 10.21 | j | 58.97 | g |
2011 | 6.34 | i | 11.12 | h | 19.69 | g | 41.80 | g | 54.46 | f | 65.74 | e | 73.39 | 70.72 | f | 60.89 | h | 49.98 | e | 35.36 | i | 27.47 | l | 63.04 | i | |
2012 | 22.19 | j | 25.55 | i | 44.00 | h | 50.66 | k | 60.80 | h | 70.77 | f | 77.02 | e | 68.80 | d | 61.00 | 45.35 | 31.80 | 15.76 | 49.95 | f | ||||
2013 | 12.03 | 13.12 | 17.37 | a | 33.47 | 58.34 | 67.78 | 72.08 | 71.29 | 65.63 | 46.21 | 30.58 | 7.44 | 41.28 | ||||||||||||
2014 | 9.45 | 8.43 | 25.77 | 42.62 | 58.87 | 68.65 | 69.92 | 69.84 | 62.10 | 50.65 | 24.90 | 20.95 | 42.68 | |||||||||||||
2015 | 18.08 | 9.70 | 35.95 | 49.87 | 59.03 | 72.02 | 73.56 | 71.35 | 67.68 | 53.00 | 39.23 | 25.27 | 47.90 | |||||||||||||
2016 | 15.27 | 25.31 | 40.47 | 45.42 | 61.69 | 71.10 | 75.94 | 73.29 | 64.40 | a | 51.53 | 43.60 | 16.37 | 48.70 | ||||||||||||
2017 | 14.92 | 25.59 | 30.94 | 47.70 | 59.00 | 70.22 | 76.35 | 68.89 | 69.02 | 50.74 | 30.87 | 18.74 | 46.91 | |||||||||||||
2018 | 14.94 | 9.50 | 27.73 | 36.47 | 66.68 | 73.28 | 73.37 | 72.85 | 62.95 | 43.29 | 26.23 | 23.26 | 44.21 | |||||||||||||
2019 | 10.50 | 1.70 | 22.18 | 45.50 | 55.75 | a | 69.58 | 71.26 | b | 70.06 | 64.25 | 45.11 | 33.03 | 15.02 | 42.00 | |||||||||||
2020 | 15.53 | 18.48 | 30.92 | 41.42 | 55.82 | 72.95 | 74.60 | 70.92 | 60.43 | 40.87 | 36.45 | 24.89 | 45.27 | |||||||||||||
2021 | 21.48 | a | 8.55 | 38.77 | 44.83 | 58.11 | 73.36 | a | 75.40 | 72.19 | 65.35 | 52.35 | 35.58 | 16.21 | 46.85 | |||||||||||
2022 | 7.10 | 9.54 | 27.13 | 38.32 | 57.26 | 69.98 | 72.90 | 70.90 | 63.15 | 49.31 | 27.87 | 10.98 | 42.04 | |||||||||||||
2023 | 12.37 | 14.48 | 15.13 | 35.75 | 64.11 | 73.75 | 70.15 | 71.05 | 64.73 | 48.63 | 34.35 | 29.63 | 44.51 | |||||||||||||
2024 | 16.06 | 30.71 | 31.85 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.21 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.37 | 13.54 | 26.40 | 42.45 | 56.00 | 66.06 | 71.08 | 68.81 | 59.49 | 46.47 | 29.45 | 15.52 | 41.94 | |||||||||||||
S.D. | 7.29 | 7.35 | 6.52 | 4.70 | 3.94 | 3.69 | 2.75 | 2.74 | 3.94 | 3.50 | 5.38 | 7.08 | 2.73 | |||||||||||||
SKEW | -0.27 | 0.45 | -0.00 | -0.14 | 0.39 | 0.08 | 0.03 | -0.26 | -0.09 | -0.01 | -0.19 | -0.24 | 0.68 | |||||||||||||
MAX | 23.71 | 30.71 | 40.47 | 51.12 | 66.68 | 73.75 | 77.02 | 74.82 | 69.02 | 55.65 | 43.60 | 29.63 | 48.70 | |||||||||||||
MIN | -7.03 | -2.34 | 15.13 | 32.20 | 48.47 | 57.85 | 65.31 | 61.89 | 48.10 | 37.35 | 15.72 | -1.84 | 36.79 | |||||||||||||
YRS | 54 | 55 | 56 | 58 | 57 | 58 | 60 | 59 | 59 | 61 | 57 | 57 | 41 |