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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.00 | p | 21.85 | j | 16.74 | h | ----- | z |
1987 | 10.90 | g | 23.80 | f | 29.87 | e | 42.96 | e | 54.33 | h | 61.60 | e | 65.71 | e | 59.81 | g | 54.35 | f | 36.62 | g | 30.96 | f | 19.98 | g | 50.03 | h |
1988 | 0.15 | g | 4.09 | f | 23.04 | g | 38.83 | u | 55.86 | f | 62.67 | j | 66.78 | h | 62.00 | h | 53.96 | d | 36.45 | k | 28.19 | i | 7.00 | j | 53.96 | k |
1989 | 12.39 | h | 1.48 | g | 17.12 | f | 33.75 | h | 50.12 | g | 57.79 | i | 64.74 | d | 62.48 | 53.57 | a | 43.73 | 21.61 | c | 1.38 | b | 41.25 | f | ||
1990 | 15.28 | d | 12.32 | c | 26.72 | a | 39.72 | a | 50.52 | 61.58 | 62.60 | 63.85 | a | 56.12 | a | 39.20 | c | 29.55 | a | 9.16 | f | 41.59 | a | |||
1991 | 2.90 | b | 16.56 | a | 25.43 | b | 42.10 | a | 54.82 | 61.37 | c | 62.73 | a | 65.17 | b | 53.42 | d | 38.58 | a | 19.36 | e | 14.16 | c | 38.05 | ||
1992 | 12.10 | f | 18.90 | d | 24.16 | b | 35.02 | a | 53.95 | a | 56.47 | a | 57.98 | b | 58.18 | a | 54.11 | g | 40.40 | a | 24.61 | h | 13.82 | k | 43.13 | d |
1993 | 8.64 | f | 9.30 | f | 23.60 | g | 35.46 | e | 47.61 | h | 55.37 | g | 62.91 | i | 63.10 | g | 47.77 | f | 37.40 | j | 20.93 | h | 12.95 | k | 35.46 | k |
1994 | -6.27 | g | 1.81 | j | 24.18 | f | 35.30 | g | 49.35 | e | 59.94 | c | 61.70 | c | 57.91 | d | 54.94 | e | 43.54 | g | 29.08 | f | 17.21 | j | 56.77 | g |
1995 | 8.06 | m | 8.69 | j | 24.54 | g | 31.79 | f | 48.21 | c | 64.07 | c | 62.25 | c | 63.36 | b | 49.77 | b | 39.25 | e | 16.04 | e | 4.88 | g | 48.99 | e |
1996 | -4.14 | i | 9.50 | k | 14.94 | f | 30.98 | c | 45.07 | d | 61.34 | b | 60.04 | c | 62.42 | a | 54.17 | a | 39.21 | g | 19.07 | 11.87 | e | 43.12 | d | |
1997 | 3.12 | b | 12.20 | 20.90 | 34.97 | 43.82 | 61.85 | 62.58 | 58.30 | a | 55.06 | d | 40.87 | 23.52 | b | 20.98 | 36.51 | |||||||||
1998 | 16.41 | b | 27.63 | a | 23.45 | a | 40.37 | 53.79 | 57.28 | 62.22 | a | 64.20 | a | 55.82 | 42.82 | a | 29.14 | a | 15.60 | b | 40.73 | |||||
1999 | 3.46 | c | 19.14 | c | 24.77 | 39.05 | 52.47 | a | 59.74 | a | 65.50 | a | 60.43 | a | 52.34 | b | 38.97 | 33.83 | a | 17.29 | e | 38.92 | ||||
2000 | 6.03 | 16.25 | a | 31.43 | a | 34.21 | a | 51.61 | 55.22 | 62.76 | 62.19 | 50.31 | a | 43.56 | 27.71 | a | 0.43 | b | 36.81 | |||||||
2001 | 12.20 | a | 3.94 | a | 21.50 | 38.33 | 50.74 | 60.42 | 64.05 | 64.37 | 52.77 | 40.19 | 36.78 | a | 19.26 | 38.71 | ||||||||||
2002 | 13.32 | a | 16.93 | 13.56 | 33.58 | 42.39 | 59.02 | 65.45 | 60.92 | 54.57 | 34.66 | 21.88 | 15.84 | 36.01 | ||||||||||||
2003 | 4.34 | 3.57 | 17.63 | e | 34.72 | a | 45.29 | n | ----- | z | 62.32 | 63.44 | 53.57 | 40.47 | 23.68 | 16.89 | 32.06 | b | ||||||||
2004 | 0.11 | 12.67 | 24.89 | 35.22 | 42.79 | 53.00 | 59.97 | a | 54.68 | 56.38 | 42.55 | ----- | z | 9.69 | 35.63 | a | ||||||||||
2005 | 2.47 | 14.93 | 18.48 | b | 40.40 | 46.32 | 60.08 | 62.95 | 60.06 | 54.92 | 42.85 | 27.65 | 14.77 | a | 37.16 | |||||||||||
2006 | 19.63 | 6.34 | 24.69 | 41.82 | 51.05 | 58.03 | 66.16 | b | ----- | z | 47.18 | k | 36.11 | 28.60 | 18.85 | 35.13 | b | |||||||||
2007 | 9.31 | 2.66 | 24.77 | 33.88 | 51.42 | 59.93 | a | 62.62 | a | 60.07 | a | 51.71 | d | 45.10 | 26.27 | 8.63 | 36.36 | |||||||||
2008 | 6.13 | 4.95 | 15.77 | 34.17 | a | 43.92 | 56.62 | 60.35 | 59.02 | 52.91 | a | 41.16 | 25.90 | 3.56 | 33.71 | |||||||||||
2009 | -1.67 | d | 11.75 | 21.66 | 37.17 | 48.05 | 56.88 | 58.05 | 58.65 | 56.93 | 36.26 | 33.07 | 7.60 | 35.37 | ||||||||||||
2010 | 7.32 | 10.43 | 34.61 | 43.22 | 51.66 | 58.22 | 65.97 | 66.00 | 49.08 | 41.94 | 26.88 | 9.52 | 38.74 | |||||||||||||
2011 | 2.98 | 11.23 | 20.23 | 36.22 | 49.00 | 57.37 | 67.32 | 62.69 | 52.17 | 44.39 | 27.72 | 17.76 | 37.42 | |||||||||||||
2012 | 13.24 | 18.41 | 37.35 | 39.02 | 52.45 | 61.13 | 68.03 | 62.05 | 51.13 | 38.39 | 26.93 | 14.71 | 40.24 | |||||||||||||
2013 | 6.55 | 8.57 | 17.81 | 29.40 | 47.84 | 58.02 | 63.82 | 62.85 | 54.78 | 40.97 | 24.15 | -0.76 | 34.50 | |||||||||||||
2014 | -4.00 | -0.91 | 13.65 | 31.68 | 49.63 | 59.65 | 62.65 | 60.76 | 53.02 | 40.76 | 17.23 | 17.18 | 33.44 | |||||||||||||
2015 | 6.90 | -0.98 | 26.37 | 38.60 | 49.18 | 58.53 | 65.69 | 62.02 | 59.33 | 42.47 | 32.88 | 23.53 | 38.71 | |||||||||||||
2016 | 9.23 | 12.71 | 29.69 | 36.25 | 52.38 | c | 58.92 | 64.44 | 63.94 | 56.42 | 44.61 | 36.23 | 11.52 | 39.69 | ||||||||||||
2017 | 10.61 | 18.66 | 22.53 | 39.05 | 46.92 | 58.77 | 62.32 | 58.03 | 56.55 | 43.56 | 23.03 | 7.74 | 37.32 | |||||||||||||
2018 | 6.55 | 4.57 | 22.18 | 29.22 | 55.37 | 59.72 | 64.58 | 62.89 | 54.53 | 37.11 | 19.32 | 15.76 | 35.98 | |||||||||||||
2019 | 1.35 | 4.95 | 19.94 | 36.17 | 44.97 | 57.22 | 65.23 | 59.68 | 54.15 | 39.08 | 21.10 | 13.71 | 34.79 | |||||||||||||
2020 | 12.56 | 9.16 | 27.02 | 33.48 | 48.66 | 60.92 | 65.66 | 62.85 | 51.18 | 34.08 | 29.60 | 15.34 | 37.54 | |||||||||||||
2021 | 14.06 | 3.75 | 30.60 | 38.47 | 49.95 | 63.27 | 64.16 | 64.55 | 53.42 | 47.19 | 25.43 | 13.02 | 38.99 | |||||||||||||
2022 | -3.94 | -1.68 | 17.77 | 29.02 | 49.32 | 57.23 | 61.98 | 61.50 | 52.28 | 41.23 | 26.92 | 9.47 | 33.43 | |||||||||||||
2023 | 13.05 | 8.34 | 16.61 | 32.23 | 50.40 | 61.35 | 60.32 | 60.10 | 57.63 | 42.81 | 26.12 | 25.82 | 37.90 | |||||||||||||
2024 | 12.00 | 23.10 | 23.24 | 36.58 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.45 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.38 | 10.68 | 23.42 | 36.25 | 49.31 | 59.23 | 63.28 | 61.50 | 53.91 | 40.79 | 26.04 | 13.04 | 37.08 | |||||||||||||
S.D. | 6.07 | 7.32 | 5.73 | 3.93 | 3.45 | 2.35 | 2.41 | 2.53 | 2.31 | 3.07 | 5.26 | 6.45 | 2.07 | |||||||||||||
SKEW | -0.06 | 0.21 | 0.39 | -0.07 | -0.34 | -0.31 | -0.28 | -0.52 | 0.03 | -0.31 | 0.15 | -0.39 | -0.22 | |||||||||||||
MAX | 19.63 | 27.63 | 37.35 | 43.22 | 55.37 | 64.07 | 68.03 | 66.00 | 59.33 | 47.19 | 36.78 | 25.82 | 40.73 | |||||||||||||
MIN | -4.00 | -1.68 | 13.56 | 29.02 | 42.39 | 53.00 | 57.98 | 54.68 | 49.08 | 34.08 | 16.04 | -0.76 | 33.43 | |||||||||||||
YRS | 30 | 31 | 32 | 33 | 32 | 33 | 35 | 33 | 33 | 32 | 31 | 30 | 25 |