YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.46 | e | 53.28 | g | 43.19 | b | 22.80 | h | 14.24 | f | 52.33 | j |
1952 | 10.24 | d | 19.75 | a | 23.11 | 44.72 | 52.92 | 61.95 | 66.02 | 63.16 | 57.19 | a | 39.81 | 32.20 | 22.00 | 41.09 | ||||||||||
1953 | 14.25 | a | 13.61 | a | 26.98 | a | ----- | z | 53.76 | 63.90 | 65.70 | a | 65.83 | a | 56.93 | 52.77 | 34.88 | 18.35 | 42.45 | a | ||||||
1954 | 8.32 | 26.43 | 22.69 | 41.57 | 47.53 | 64.35 | 66.81 | 63.21 | 55.07 | c | 43.87 | a | 33.03 | 20.55 | 41.12 | |||||||||||
1955 | 10.39 | 11.54 | a | 21.67 | a | 49.54 | e | 57.73 | a | 61.67 | a | ----- | z | ----- | z | 55.86 | p | 45.60 | b | 23.18 | 7.76 | 32.12 | c | |||
1956 | 10.58 | a | 9.66 | 22.23 | a | 38.13 | 52.58 | 64.68 | 61.55 | 61.89 | 51.57 | 49.47 | 28.67 | a | 17.31 | 39.03 | ||||||||||
1957 | 2.29 | 13.09 | 22.69 | 41.75 | 51.94 | 61.13 | 68.87 | 63.68 | a | 53.42 | 43.35 | 29.93 | 18.06 | 39.18 | ||||||||||||
1958 | 16.50 | 9.98 | 27.40 | b | 41.09 | a | 52.34 | 56.12 | a | 62.85 | 62.68 | a | 56.83 | a | 46.69 | 31.50 | 9.00 | 39.42 | ||||||||
1959 | 3.77 | 9.93 | a | 27.53 | 41.45 | a | 57.12 | a | 63.43 | a | 65.24 | 68.73 | 57.48 | a | 42.31 | 20.83 | a | 24.90 | 40.23 | |||||||
1960 | 13.16 | 15.14 | 16.97 | 42.62 | 52.72 | a | 57.89 | b | 64.08 | 66.55 | 58.12 | 46.14 | c | 33.05 | 15.57 | b | 40.17 | |||||||||
1961 | 10.06 | 22.27 | 31.11 | 37.55 | 50.13 | 61.97 | 66.05 | a | 67.36 | c | 57.75 | f | 47.08 | f | 29.32 | 13.54 | g | 41.76 | c | |||||||
1962 | 3.93 | i | 14.35 | k | 29.12 | f | 38.98 | i | 54.87 | 59.14 | i | 63.25 | c | 62.91 | i | 53.77 | h | 46.03 | n | ----- | z | 15.00 | d | 44.37 | i | |
1963 | 1.21 | 12.75 | j | 27.93 | b | 44.27 | 50.16 | i | 61.72 | g | 67.13 | 62.64 | c | 56.72 | a | 52.78 | a | ----- | z | 10.45 | c | 40.39 | d | |||
1964 | 17.17 | e | 18.02 | 22.50 | b | 44.04 | g | 56.94 | e | 59.89 | g | ----- | z | 61.44 | ----- | z | 45.93 | j | 34.59 | b | 8.58 | e | 31.32 | e | ||
1965 | 3.18 | c | 7.00 | e | 15.29 | e | 38.20 | e | 57.05 | b | ----- | z | ----- | z | ----- | z | 50.69 | a | ----- | z | ----- | z | ----- | z | 28.57 | f |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | 49.70 | c | 62.48 | 68.27 | 62.27 | c | 55.28 | 44.35 | 28.95 | a | 15.18 | a | 48.31 | d | ||||
1967 | 13.08 | 6.23 | 24.38 | e | 41.42 | 47.61 | 62.29 | i | ----- | z | 62.90 | 57.62 | 44.98 | a | 27.04 | b | 18.39 | 34.37 | b | |||||||
1968 | 11.05 | a | ----- | z | 35.45 | ----- | z | 51.47 | ----- | z | ----- | z | ----- | z | 57.25 | ----- | z | 30.37 | c | 14.58 | 33.36 | f | ||||
1969 | 7.42 | 14.00 | b | 22.23 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 14.55 | i | ||
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.09 | d | 19.09 | k |
1971 | ----- | z | ----- | z | 25.26 | 43.18 | 52.06 | 66.98 | 64.08 | 63.40 | 58.37 | 51.71 | 32.07 | 18.66 | c | 47.58 | b | |||||||||
1972 | 4.29 | 10.93 | 23.89 | 39.32 | 58.98 | 61.90 | 65.42 | 64.47 | a | 54.87 | 41.82 | 30.12 | 11.66 | 38.97 | ||||||||||||
1973 | 17.13 | 23.09 | f | 37.55 | 41.98 | 51.44 | 64.19 | a | 67.18 | a | 67.68 | 55.65 | 51.94 | 31.72 | 17.67 | a | 45.83 | a | ||||||||
1974 | 10.32 | a | ----- | z | 26.95 | 44.10 | 52.10 | a | 60.80 | 70.00 | 63.10 | 52.16 | b | 47.97 | b | 34.43 | a | ----- | z | 46.19 | b | |||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.63 | h | 64.27 | 52.63 | 47.70 | c | 34.07 | a | 14.84 | b | 42.70 | g | ||
1976 | 6.55 | a | 22.07 | h | 24.34 | f | 44.38 | a | 49.62 | e | 65.00 | b | 69.97 | a | 65.35 | 53.62 | d | 37.00 | n | 23.37 | d | ----- | z | 47.23 | d | |
1977 | -5.59 | c | ----- | z | 34.55 | j | 48.98 | c | 64.47 | 63.56 | d | ----- | z | 60.91 | c | 56.00 | c | 44.84 | 31.93 | j | 15.25 | c | 43.55 | d | ||
1978 | 2.18 | l | ----- | z | 32.66 | l | 37.65 | f | 59.39 | d | 64.31 | f | 66.89 | ----- | z | ----- | z | ----- | z | 23.07 | h | 8.37 | 44.88 | i | ||
1979 | -4.00 | c | 1.27 | 23.63 | h | 35.09 | a | ----- | z | ----- | z | 67.74 | h | 67.53 | k | 57.03 | k | 41.55 | i | 30.68 | 23.20 | k | 15.76 | h | ||
1980 | 12.38 | n | 6.05 | 22.40 | k | ----- | z | 57.41 | h | 61.05 | k | 71.32 | f | 66.43 | j | 55.52 | j | 38.55 | c | 33.60 | i | 15.60 | p | 22.30 | j | |
1981 | 17.82 | i | 23.11 | j | 31.66 | l | 41.97 | l | 49.97 | n | 63.32 | h | 71.13 | 69.17 | h | 55.74 | e | 40.52 | g | 33.75 | d | 13.75 | a | 43.59 | h | |
1982 | -5.22 | f | 11.57 | a | 25.36 | c | 36.26 | a | 61.33 | b | 52.71 | a | 75.07 | a | 63.90 | b | 54.79 | a | 48.50 | a | 25.62 | e | 23.06 | e | 43.47 | a |
1983 | 12.79 | b | 25.08 | c | 30.03 | 33.95 | a | 46.16 | 62.72 | c | 78.68 | 76.87 | 57.37 | 43.88 | a | 30.80 | e | 4.59 | d | 41.91 | ||||||
1984 | 4.64 | f | 21.94 | c | 17.48 | h | 40.27 | 48.31 | b | 63.78 | 67.58 | 71.55 | 52.07 | a | 44.72 | a | 27.55 | b | 18.73 | i | 48.64 | c | ||||
1985 | 9.25 | c | 8.63 | e | 31.53 | a | 45.88 | 55.32 | 54.13 | 68.82 | 64.50 | b | 54.67 | 43.92 | 21.74 | a | 8.41 | d | 38.90 | |||||||
1986 | 18.75 | c | 10.42 | d | 31.50 | d | 47.31 | a | 54.03 | a | 63.82 | 74.85 | 64.00 | a | 56.61 | b | 48.38 | a | 25.07 | 22.30 | a | 43.09 | ||||
1987 | 20.26 | b | 26.85 | a | 36.27 | c | 49.05 | a | 60.48 | 69.19 | a | 74.52 | 66.95 | a | 58.92 | 40.65 | a | 35.92 | d | 24.17 | b | 46.94 | ||||
1988 | 12.00 | d | 3.50 | f | 28.75 | a | 39.92 | 58.87 | a | 74.76 | a | 77.76 | 72.90 | 55.10 | 42.66 | 34.41 | c | 15.55 | a | 46.61 | a | |||||
1989 | 17.28 | a | 5.86 | j | 23.16 | c | 41.29 | a | 56.27 | a | 59.47 | 73.00 | 68.52 | a | 57.27 | 45.70 | c | 25.46 | b | 2.98 | b | 42.76 | a | |||
1990 | 28.40 | a | 22.89 | 34.61 | 44.07 | 50.83 | a | 67.81 | a | 66.65 | 68.74 | 61.67 | 42.89 | 37.25 | 20.12 | b | 45.49 | |||||||||
1991 | 3.52 | a | 21.00 | a | 32.85 | a | 41.45 | 59.18 | 71.93 | 70.73 | 68.87 | a | 54.85 | 44.43 | b | 23.11 | b | 20.32 | a | 42.69 | ||||||
1992 | 20.03 | b | 20.02 | a | 30.16 | 41.20 | b | 52.60 | 61.48 | a | 58.34 | b | 60.10 | 53.45 | a | 44.07 | b | 29.00 | 18.82 | a | 40.77 | |||||
1993 | 16.38 | c | 12.98 | 27.45 | a | 36.79 | a | 50.65 | 54.38 | a | 67.94 | 69.77 | a | 50.47 | a | 42.27 | a | 30.05 | a | 22.36 | b | 40.12 | ||||
1994 | -9.72 | h | 7.71 | d | 35.07 | d | 41.33 | f | 53.62 | b | 67.30 | b | 68.26 | 65.60 | b | 59.86 | a | 47.87 | 32.17 | a | 25.02 | a | 46.25 | b | ||
1995 | 15.66 | f | 14.05 | h | 32.07 | d | 34.98 | b | 50.52 | b | 71.22 | c | 72.69 | 72.76 | 57.41 | b | 45.43 | b | 24.61 | b | 14.57 | d | 47.63 | b | ||
1996 | 1.90 | e | 14.93 | g | 20.28 | b | 32.92 | f | 50.80 | c | 60.88 | d | 66.35 | d | 68.68 | a | 58.31 | a | 46.43 | b | 21.69 | c | 12.60 | b | 40.79 | b |
1997 | 1.68 | a | 12.59 | a | 23.81 | d | 35.38 | b | 42.45 | a | 61.72 | 66.02 | a | 57.19 | b | 55.17 | 41.64 | b | 26.00 | 22.53 | 37.18 | |||||
1998 | 18.46 | d | 28.37 | a | 25.12 | b | 45.84 | a | 60.03 | a | 61.43 | 67.05 | 65.95 | b | 60.15 | 46.79 | 34.48 | b | 22.03 | a | 44.64 | |||||
1999 | 10.93 | b | 23.57 | 28.84 | 44.91 | c | 56.41 | b | 63.23 | 70.35 | a | 64.66 | b | 56.86 | a | 45.71 | 39.40 | a | 20.61 | d | 43.79 | |||||
2000 | 11.53 | 21.29 | 35.90 | 39.97 | a | 54.59 | b | 58.12 | a | 65.56 | 65.44 | 55.14 | b | 49.65 | 30.48 | 4.84 | b | 41.04 | ||||||||
2001 | 16.84 | b | 10.50 | a | 24.47 | a | 44.21 | a | 57.13 | a | 64.13 | 65.98 | a | 66.23 | 53.35 | 45.60 | a | 40.69 | a | 23.82 | a | 42.75 | ||||
2002 | ----- | z | 22.09 | a | 19.02 | 40.77 | 48.32 | 64.78 | a | 70.61 | 65.08 | 58.93 | 37.16 | 26.29 | a | 21.42 | 43.13 | a | ||||||||
2003 | 9.44 | 10.39 | 26.00 | 41.10 | 49.92 | 60.87 | 65.10 | 66.95 | 56.85 | 42.11 | 28.03 | 20.13 | a | 39.74 | ||||||||||||
2004 | 5.93 | a | 18.90 | 30.48 | 43.07 | 51.26 | 59.02 | a | 64.56 | 57.89 | 61.55 | 45.85 | 32.02 | a | 16.15 | 40.56 | ||||||||||
2005 | 10.95 | 20.66 | 23.31 | 45.33 | 50.32 | 65.82 | 68.21 | 64.79 | 60.55 | 47.84 | 33.08 | 17.52 | 42.36 | |||||||||||||
2006 | 25.15 | 14.27 | 28.19 | 48.23 | 55.12 | a | 59.70 | 69.53 | a | 63.05 | 50.20 | 39.52 | 32.29 | a | 24.56 | 42.48 | ||||||||||
2007 | 16.42 | 8.54 | 32.37 | 40.95 | 57.35 | 64.42 | 66.12 | a | 63.50 | 56.90 | 47.74 | ----- | z | 12.27 | 42.42 | a | ||||||||||
2008 | 10.47 | a | 10.64 | a | 22.69 | 40.30 | 49.10 | 58.68 | 64.40 | a | 62.20 | a | 56.52 | a | 45.15 | 30.82 | 10.10 | 38.42 | ||||||||
2009 | 0.74 | 17.04 | a | 28.10 | 39.08 | 51.45 | a | 60.26 | a | 59.92 | a | 60.82 | a | 58.22 | 40.47 | 35.30 | 11.69 | 38.59 | ||||||||
2010 | 10.10 | 13.20 | 36.52 | a | 47.58 | 53.18 | a | 61.64 | a | 64.23 | r | 68.91 | d | 53.50 | 46.32 | 32.28 | a | 13.80 | a | 39.73 | a | |||||
2011 | 8.37 | 16.27 | 24.45 | 40.83 | a | 52.68 | 62.38 | 69.71 | c | 63.81 | 54.40 | 47.02 | 31.66 | a | 22.00 | a | 41.13 | |||||||||
2012 | 18.27 | 18.66 | 42.18 | 42.02 | d | 52.73 | e | 64.43 | 71.21 | 63.21 | 54.68 | 41.75 | a | 32.03 | 20.79 | 43.50 | ||||||||||
2013 | 13.69 | 13.70 | a | 21.15 | 34.82 | 52.68 | 61.60 | 66.56 | 64.71 | 59.04 | c | 45.10 | 28.52 | 6.32 | 38.99 | |||||||||||
2014 | 1.60 | a | 3.81 | a | 19.53 | 36.43 | 54.42 | 64.64 | a | 64.39 | 64.27 | 56.05 | 44.26 | 21.60 | 20.55 | 37.63 | ||||||||||
2015 | 12.90 | 3.95 | 30.00 | 44.35 | 54.18 | 61.65 | 66.00 | 63.40 | 62.15 | 45.84 | 36.52 | 28.68 | 42.47 | |||||||||||||
2016 | 13.40 | 19.26 | 35.73 | 42.70 | 54.11 | 63.40 | 66.95 | 65.11 | 59.40 | 47.69 | 39.58 | 16.85 | 43.68 | |||||||||||||
2017 | 16.26 | 25.61 | 28.18 | 44.58 | 51.92 | 61.58 | 65.11 | 59.94 | 59.80 | 47.39 | 28.10 | 12.71 | 41.76 | |||||||||||||
2018 | 11.32 | a | 9.59 | a | 25.24 | 28.95 | 60.58 | 64.37 | 65.98 | 64.55 | 58.52 | 41.55 | 24.22 | 22.61 | 39.79 | |||||||||||
2019 | 9.50 | 10.38 | 21.68 | 39.88 | 50.15 | 61.67 | 67.96 | r | 62.45 | 60.07 | 43.76 | 25.47 | 18.18 | 36.65 | a | |||||||||||
2020 | 18.34 | 16.48 | 33.21 | 40.17 | 53.81 | 64.72 | 68.84 | 65.79 | 55.33 | 38.39 | 35.92 | 21.48 | 42.71 | |||||||||||||
2021 | 18.68 | 8.46 | 36.42 | a | 42.77 | 53.85 | 67.13 | 66.89 | 66.61 | 59.37 | 51.63 | 32.03 | 20.03 | 43.66 | ||||||||||||
2022 | 6.22 | a | 9.50 | 26.02 | a | 37.73 | 55.27 | 64.02 | 67.52 | 65.44 | 58.23 | 46.73 | 32.83 | 14.80 | a | 40.36 | ||||||||||
2023 | 18.79 | 19.20 | 25.82 | 41.02 | 57.34 | 65.52 | 65.84 | 66.10 | 61.87 | 47.71 | 31.22 | 31.47 | 44.32 | |||||||||||||
2024 | 19.02 | 29.09 | 33.87 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.32 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.28 | 15.00 | 27.60 | 41.44 | 53.60 | 62.86 | 67.63 | 65.00 | 56.49 | 45.19 | 30.37 | 17.00 | 41.30 | |||||||||||||
S.D. | 6.81 | 6.78 | 5.63 | 4.08 | 4.02 | 3.94 | 3.83 | 3.46 | 2.85 | 3.47 | 4.64 | 5.98 | 2.25 | |||||||||||||
SKEW | -0.16 | 0.24 | 0.27 | -0.34 | 0.16 | 0.17 | 0.63 | 0.75 | -0.15 | 0.06 | -0.14 | -0.27 | 0.35 | |||||||||||||
MAX | 28.40 | 29.09 | 42.18 | 49.54 | 64.47 | 74.76 | 78.68 | 76.87 | 62.15 | 52.78 | 40.69 | 31.47 | 46.94 | |||||||||||||
MIN | -5.59 | 1.27 | 15.29 | 28.95 | 42.45 | 52.71 | 58.34 | 57.19 | 50.20 | 37.16 | 20.83 | 2.98 | 37.18 | |||||||||||||
YRS | 60 | 56 | 62 | 59 | 65 | 59 | 59 | 63 | 63 | 62 | 63 | 64 | 39 |