YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.67 | l | 58.79 | 28.07 | 18.50 | 35.12 | i | |||
1948 | 8.10 | 14.67 | ----- | z | 48.10 | 55.92 | 65.70 | 70.81 | 71.19 | 64.47 | 47.04 | d | 36.16 | a | 19.66 | 45.62 | a | |||||||||
1949 | 16.95 | 17.00 | 27.97 | 44.83 | 58.74 | 70.18 | 73.03 | 70.39 | 56.50 | 51.55 | 33.17 | 20.45 | 45.06 | |||||||||||||
1950 | 12.24 | 15.96 | 23.26 | 34.83 | 54.47 | 65.27 | 66.65 | 63.42 | 59.10 | 52.53 | 29.24 | e | 11.53 | 40.71 | ||||||||||||
1951 | 10.35 | 16.46 | 23.55 | 40.47 | 59.34 | 61.07 | 67.65 | a | 63.84 | 55.45 | 46.45 | 23.75 | 16.48 | 40.41 | ||||||||||||
1952 | 13.92 | 20.28 | 24.03 | 45.63 | 53.60 | 65.75 | 70.15 | 65.56 | 58.90 | 41.74 | 34.00 | 23.68 | a | 43.10 | ||||||||||||
1953 | 18.24 | 15.88 | 28.11 | 39.64 | a | 54.56 | 66.57 | 68.40 | 68.53 | 59.10 | 52.81 | 38.22 | 22.69 | 44.40 | ||||||||||||
1954 | 12.40 | 27.07 | 26.37 | 44.02 | 49.23 | 66.40 | 68.55 | 64.68 | 57.28 | 45.84 | 34.59 | c | 20.03 | 43.04 | ||||||||||||
1955 | 12.90 | 15.00 | 24.24 | 48.73 | 57.68 | 63.60 | 73.95 | 71.55 | 59.16 | a | 48.56 | 27.50 | a | 13.45 | 43.03 | |||||||||||
1956 | 14.26 | 14.12 | 21.95 | 38.48 | 52.92 | 66.40 | 65.19 | 66.16 | 55.53 | a | 52.45 | 31.52 | a | 21.00 | 41.67 | |||||||||||
1957 | 7.42 | 18.25 | 28.68 | 43.70 | 52.84 | 63.58 | 69.52 | 66.03 | 56.02 | 44.94 | 31.73 | 21.12 | a | 41.98 | ||||||||||||
1958 | 18.69 | 14.44 | a | 29.09 | h | ----- | z | 58.27 | i | 60.28 | 67.08 | 68.42 | 59.57 | a | 51.02 | 34.92 | 13.11 | 43.06 | c | |||||||
1959 | 8.24 | 12.71 | 26.42 | 43.78 | 60.18 | 67.31 | a | 69.24 | 72.21 | 61.12 | a | 43.69 | 23.36 | a | 27.21 | 42.96 | ||||||||||
1960 | 18.15 | 20.41 | a | 20.02 | 45.60 | a | 55.08 | 62.80 | 68.42 | a | 69.16 | 60.98 | 47.60 | 36.35 | 17.61 | 43.51 | ||||||||||
1961 | 14.81 | 25.91 | 32.53 | 40.90 | 53.91 | b | 66.52 | 70.05 | 68.94 | 61.20 | 50.27 | a | 32.72 | 16.38 | a | 44.51 | ||||||||||
1962 | 10.23 | 13.91 | 27.87 | 42.98 | 61.18 | 65.10 | 66.55 | 68.53 | 56.30 | 49.87 | 35.05 | 19.16 | 43.06 | |||||||||||||
1963 | 4.52 | 10.77 | 29.74 | 47.23 | 54.00 | 67.22 | 70.47 | 66.03 | 59.62 | 57.82 | 38.65 | 13.24 | 43.28 | |||||||||||||
1964 | 21.13 | 22.64 | 27.90 | 46.07 | 61.53 | 66.33 | 72.06 | 65.21 | 57.92 | 46.35 | 37.67 | 15.71 | 45.04 | |||||||||||||
1965 | 13.02 | 14.86 | 23.31 | 39.98 | 60.31 | 64.13 | 67.82 | 65.98 | 55.80 | 48.81 | 33.95 | 27.23 | 42.93 | |||||||||||||
1966 | 6.82 | 18.77 | 32.50 | 41.50 | 52.34 | 68.23 | 73.05 | 66.61 | 58.45 | 47.63 | 32.93 | 20.26 | 43.26 | |||||||||||||
1967 | 17.35 | 11.41 | 28.87 | 43.88 | 50.71 | 65.47 | 67.37 | 64.42 | 58.20 | 46.47 | 30.57 | a | 21.15 | 42.16 | ||||||||||||
1968 | 15.08 | 15.60 | 37.68 | 45.92 | 53.29 | 65.20 | 69.00 | 68.82 | 60.87 | 50.69 | 33.83 | a | 19.47 | 44.62 | ||||||||||||
1969 | 13.37 | 20.14 | 24.77 | 46.76 | a | 57.55 | 58.80 | 69.35 | 70.60 | 58.87 | 45.76 | 32.14 | a | 21.63 | 43.31 | |||||||||||
1970 | 8.37 | 15.98 | a | 26.10 | 46.00 | 57.27 | 67.92 | 71.94 | 68.84 | 60.22 | 50.75 | a | 32.67 | 19.47 | 43.79 | |||||||||||
1971 | 7.53 | 17.00 | a | 24.85 | 43.82 | 52.89 | 69.57 | 66.39 | 65.44 | 62.15 | 55.27 | 34.68 | 22.84 | 43.54 | ||||||||||||
1972 | 9.60 | 14.24 | 24.87 | 39.12 | a | 60.03 | 64.02 | 67.94 | 68.24 | 58.65 | 45.50 | 32.81 | a | 16.47 | 41.79 | |||||||||||
1973 | 19.93 | a | 20.98 | a | 38.88 | a | 42.70 | 52.16 | 67.57 | 72.02 | 70.47 | 60.62 | 55.00 | 33.85 | 18.94 | 46.09 | ||||||||||
1974 | 15.78 | a | 17.41 | 29.95 | a | 46.83 | 53.05 | 62.88 | 71.77 | 67.87 | 55.60 | 50.46 | g | 35.35 | 24.53 | 43.73 | a | |||||||||
1975 | 17.08 | 18.20 | 24.60 | a | 37.75 | 61.05 | 65.72 | 72.16 | 68.71 | 56.02 | 50.60 | b | 39.30 | 19.45 | a | 44.22 | ||||||||||
1976 | 11.66 | 23.88 | c | 23.44 | w | ----- | z | ----- | z | ----- | z | 72.19 | 67.54 | c | 58.04 | b | 43.31 | 28.04 | d | 9.61 | l | 43.52 | e | |||
1977 | 2.89 | c | 19.44 | d | 36.26 | b | 50.05 | 64.34 | 63.02 | 68.96 | q | ----- | z | 56.80 | y | 47.55 | 31.46 | c | 17.14 | b | 36.90 | c | ||||
1978 | 9.04 | e | 10.78 | c | 24.52 | h | 40.13 | g | 58.28 | d | 63.16 | h | 67.72 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.46 | h |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.79 | a | 44.96 | g | 30.52 | a | 22.85 | 37.06 | i | |
1980 | 12.71 | 26.29 | v | 25.31 | r | 42.30 | g | 55.82 | a | 62.63 | g | 69.23 | 65.69 | g | 56.62 | e | 44.06 | o | 32.69 | n | 17.37 | h | 48.59 | h | ||
1981 | 13.82 | f | 23.61 | e | 33.02 | b | 45.60 | 52.52 | f | 63.22 | 67.48 | 66.02 | a | 55.90 | 42.77 | 35.55 | 18.34 | 45.15 | b | |||||||
1982 | 3.41 | c | 14.29 | d | 25.85 | a | 39.08 | 60.93 | a | 57.83 | a | 68.57 | c | 63.34 | 56.16 | b | 47.66 | c | 31.24 | c | 24.84 | 41.10 | ||||
1983 | 18.61 | d | 25.50 | 31.63 | d | 40.74 | c | 49.25 | c | 64.03 | 72.25 | a | 70.60 | 58.62 | 45.09 | b | 33.75 | b | 8.42 | a | 43.21 | |||||
1984 | 10.17 | b | 24.60 | 21.72 | b | 43.00 | d | 53.00 | b | 65.60 | a | 67.13 | a | 68.40 | 56.65 | m | 43.50 | r | 32.67 | 22.55 | b | 40.89 | b | |||
1985 | 11.45 | a | 15.43 | a | 32.35 | 48.48 | 59.38 | a | 61.28 | 66.02 | a | 63.62 | c | 54.46 | g | 46.15 | a | 26.59 | c | 8.53 | b | 39.94 | a | |||
1986 | 14.90 | a | 16.15 | a | 30.88 | a | 48.29 | b | 57.66 | 63.27 | 69.19 | 63.00 | q | 57.28 | u | 44.58 | s | 27.78 | 21.69 | 38.87 | c | |||||
1987 | 19.53 | 26.17 | a | 34.40 | 49.24 | a | 58.55 | a | 67.03 | 66.89 | 64.98 | 58.95 | 40.58 | 35.97 | 25.50 | a | 45.65 | |||||||||
1988 | 10.06 | 13.75 | a | 29.13 | a | 42.35 | c | 56.94 | e | 65.38 | a | 70.30 | d | 69.35 | d | 58.40 | d | 40.47 | b | 31.98 | c | 15.57 | a | 41.97 | ||
1989 | 20.55 | 9.92 | b | 17.28 | f | 40.41 | b | 52.28 | a | 60.04 | d | 66.38 | g | 64.29 | 52.73 | b | 44.50 | f | 24.33 | g | 4.81 | m | 42.89 | e | ||
1990 | 21.92 | g | 18.80 | 30.46 | h | 44.17 | a | 51.56 | g | 65.02 | a | 66.69 | 65.31 | 59.80 | 44.89 | 37.18 | 17.50 | 46.60 | c | |||||||
1991 | 11.00 | 20.98 | 31.44 | 46.53 | 59.26 | b | 67.00 | g | 67.09 | c | 67.32 | 55.57 | a | 45.33 | a | 27.19 | a | 20.30 | a | 41.09 | a | |||||
1992 | 18.40 | 23.98 | 28.34 | 40.38 | b | 56.42 | a | 60.68 | 62.60 | 62.44 | 56.10 | 44.97 | 29.47 | 19.95 | 41.98 | |||||||||||
1993 | 14.82 | 15.91 | 28.81 | 39.97 | 55.07 | a | 60.88 | a | 67.03 | 67.17 | b | 51.26 | a | 43.28 | b | 28.59 | a | 20.15 | d | 41.08 | ||||||
1994 | 1.93 | c | 10.62 | b | 29.55 | a | 43.20 | e | 53.20 | d | 66.50 | d | 66.26 | d | 61.69 | o | 61.71 | f | 48.66 | c | 36.64 | a | 24.25 | c | 38.08 | b |
1995 | 16.16 | 15.20 | a | 30.66 | 37.50 | d | 53.35 | a | 67.41 | a | 69.17 | a | 71.00 | f | 55.79 | b | 45.98 | b | 22.88 | b | 13.42 | 38.87 | a | |||
1996 | 8.38 | a | 14.43 | 19.63 | a | 38.00 | 51.96 | d | 64.59 | a | 64.68 | 66.16 | 58.17 | a | 44.61 | 24.90 | 17.50 | 39.42 | ||||||||
1997 | 10.05 | 17.93 | a | 25.58 | 40.43 | 47.63 | a | 64.75 | b | 67.08 | 61.77 | a | 58.28 | a | 45.58 | 28.53 | a | 25.39 | 41.08 | |||||||
1998 | 18.74 | 29.48 | 30.32 | 46.38 | b | 60.07 | a | 61.56 | c | 67.43 | a | 66.61 | 61.48 | b | 47.60 | 36.00 | 23.00 | a | 45.72 | |||||||
1999 | 9.00 | a | 23.20 | a | 29.21 | 45.98 | a | 57.24 | 64.02 | 69.85 | 63.75 | a | 55.52 | b | 43.72 | b | 38.41 | c | 20.39 | 43.36 | ||||||
2000 | 12.58 | 21.50 | 36.87 | 41.25 | 55.03 | a | 61.42 | 66.47 | a | 66.05 | a | 56.73 | d | 48.60 | 32.56 | c | 7.85 | 42.24 | ||||||||
2001 | 18.53 | a | 12.89 | a | 26.17 | a | 45.07 | 55.68 | 61.95 | b | 64.83 | g | 68.37 | 55.22 | 44.16 | b | 40.48 | c | 26.06 | 41.32 | a | |||||
2002 | 22.79 | 24.95 | 23.27 | 41.33 | 49.33 | a | 64.78 | 71.03 | 65.50 | c | 60.67 | 41.24 | 30.97 | 23.64 | b | 43.29 | ||||||||||
2003 | 12.52 | 11.00 | 27.17 | a | 40.82 | 52.67 | b | 61.79 | b | 67.09 | b | 69.10 | a | 57.85 | c | 45.31 | 32.03 | 23.28 | a | 41.72 | ||||||
2004 | 8.05 | 18.20 | b | 30.69 | 43.03 | 51.29 | 60.98 | 65.73 | a | 61.72 | d | 61.98 | a | 46.71 | 35.80 | 18.13 | a | 41.86 | ||||||||
2005 | 12.00 | 22.25 | 24.00 | 46.63 | 52.14 | b | 68.82 | 69.55 | 68.15 | 61.48 | b | 48.52 | 31.84 | a | 16.76 | 43.51 | ||||||||||
2006 | 25.31 | 15.07 | a | 29.48 | 47.48 | a | 55.32 | 64.05 | 71.56 | 66.32 | 55.57 | a | 40.91 | c | 34.91 | a | 25.50 | 44.29 | ||||||||
2007 | 19.60 | 11.09 | 32.11 | 41.48 | 58.03 | 65.28 | 68.37 | a | 66.77 | 59.52 | 50.50 | a | 31.23 | b | 15.05 | 43.25 | ||||||||||
2008 | 13.24 | 11.33 | 22.44 | 42.07 | 50.93 | b | 63.00 | 67.74 | 65.35 | 59.75 | 46.25 | a | 31.78 | a | 10.16 | b | 40.34 | |||||||||
2009 | 4.85 | 18.12 | 26.73 | 41.48 | c | 54.37 | a | 62.85 | 62.85 | 64.98 | b | 60.11 | b | 41.79 | 39.67 | 17.60 | 41.28 | |||||||||
2010 | 16.16 | 20.46 | 37.10 | 49.21 | a | 57.33 | b | 64.24 | c | 70.95 | 69.68 | 55.72 | a | 48.55 | 32.88 | b | 18.63 | d | 45.08 | |||||||
2011 | 9.92 | a | 16.39 | 24.61 | 39.39 | b | 53.85 | a | 62.61 | c | 71.72 | d | 68.08 | 55.52 | a | 48.23 | 35.80 | b | 24.75 | a | 42.57 | |||||
2012 | 18.84 | 24.78 | 43.52 | 44.43 | 58.43 | c | 66.55 | 74.05 | 66.63 | 56.19 | a | 43.53 | a | 32.69 | a | 24.23 | 46.15 | |||||||||
2013 | 17.71 | x | ----- | z | ----- | z | ----- | z | 56.14 | f | 63.95 | 68.90 | 67.18 | a | 60.43 | a | 45.77 | 29.95 | 11.21 | 49.63 | e | |||||
2014 | 4.65 | 6.06 | a | 19.27 | 38.45 | 54.90 | a | 67.10 | 65.10 | 67.00 | 58.34 | b | 45.85 | 24.70 | 23.06 | 39.54 | ||||||||||
2015 | 13.97 | 6.39 | a | 30.23 | 44.33 | 57.34 | 64.13 | 68.47 | 66.12 | a | 65.98 | b | 48.07 | a | 39.05 | 31.45 | a | 44.63 | ||||||||
2016 | 15.37 | 22.02 | a | 36.33 | a | 41.45 | 56.19 | 65.88 | a | 69.84 | 69.48 | 62.57 | a | 49.55 | a | 41.73 | 20.05 | 45.87 | ||||||||
2017 | 17.89 | 25.69 | a | 28.79 | 46.60 | 53.19 | 64.23 | f | 69.13 | a | 64.67 | b | 62.55 | a | 50.27 | 30.98 | 16.60 | 42.40 | a | |||||||
2018 | 15.15 | 16.20 | a | 29.42 | 31.97 | 62.10 | 67.27 | 71.60 | a | 70.21 | 63.02 | c | 44.15 | 29.15 | 27.53 | 43.98 | ||||||||||
2019 | 15.94 | 15.30 | 27.18 | 42.95 | 52.76 | b | 64.58 | 71.83 | a | 66.11 | 62.37 | 46.31 | 30.00 | 24.81 | 43.34 | |||||||||||
2020 | 23.37 | 19.77 | a | 35.31 | 41.75 | 55.52 | 67.20 | 72.50 | 69.26 | 57.67 | 42.55 | 38.67 | 24.56 | 45.68 | ||||||||||||
2021 | 20.92 | 13.12 | 37.53 | 45.53 | 55.84 | b | 68.95 | 68.94 | 68.77 | 60.68 | 53.10 | 32.90 | 23.56 | 45.82 | ||||||||||||
2022 | 8.29 | 14.82 | 28.90 | 38.50 | 57.36 | b | 65.28 | 69.05 | 67.23 | 60.45 | 46.82 | 35.78 | 18.79 | 42.61 | ||||||||||||
2023 | 22.82 | 20.85 | a | 28.87 | 43.90 | 55.73 | 67.32 | 68.85 | 67.94 | 63.84 | e | 49.16 | 34.28 | 31.71 | 46.27 | |||||||||||
2024 | 21.18 | 30.81 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.99 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 13.61 | 17.75 | 28.71 | 43.12 | 55.60 | 64.65 | 68.93 | 67.03 | 58.61 | 47.28 | 32.76 | 19.93 | 43.20 | |||||||||||||
S.D. | 5.35 | 5.21 | 4.94 | 3.62 | 3.48 | 2.58 | 2.48 | 2.37 | 2.76 | 3.86 | 4.14 | 5.02 | 1.72 | |||||||||||||
SKEW | -0.07 | 0.25 | 0.51 | -0.36 | 0.12 | -0.31 | -0.08 | -0.10 | 0.13 | 0.66 | -0.27 | -0.28 | -0.10 | |||||||||||||
MAX | 25.31 | 30.81 | 43.52 | 50.05 | 64.34 | 70.18 | 74.05 | 72.21 | 65.98 | 58.79 | 41.73 | 31.71 | 46.27 | |||||||||||||
MIN | 1.93 | 6.06 | 19.27 | 31.97 | 47.63 | 57.83 | 62.60 | 61.72 | 51.26 | 40.47 | 22.88 | 7.85 | 39.42 | |||||||||||||
YRS | 73 | 74 | 67 | 70 | 70 | 70 | 72 | 69 | 70 | 70 | 74 | 73 | 56 |