YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 65.50 | f | 67.55 | 68.21 | 56.47 | 51.18 | 35.83 | 20.45 | 49.95 | f | ||||||
1963 | 3.37 | 13.54 | 33.82 | 48.14 | e | 55.79 | 69.00 | b | 70.94 | 67.05 | 61.88 | 57.87 | 38.97 | 11.08 | 44.29 | |||||||||||
1964 | 22.37 | 24.50 | 28.21 | 47.23 | 61.92 | 67.93 | ----- | z | 64.52 | f | 59.40 | 47.65 | 36.57 | 13.96 | r | 43.98 | c | |||||||||
1965 | 8.57 | a | 10.14 | g | 19.14 | c | 41.39 | b | 60.32 | a | 64.95 | b | 67.84 | ----- | z | 54.48 | 49.35 | a | 34.05 | 28.53 | a | 42.86 | b | |||
1966 | 3.68 | 16.14 | 35.56 | 42.33 | 52.55 | 67.05 | 74.34 | 67.68 | 59.52 | 48.85 | 33.11 | c | 20.87 | a | 43.47 | |||||||||||
1967 | 17.03 | 10.84 | 31.42 | 46.67 | a | 52.24 | 67.64 | a | 68.44 | 65.45 | b | 59.23 | 48.12 | a | 30.27 | 26.16 | c | 43.63 | ||||||||
1968 | 15.92 | 15.61 | a | 38.48 | b | 48.17 | c | 54.35 | a | 66.75 | 70.08 | 69.18 | 61.05 | 51.66 | 33.95 | 19.40 | 45.38 | |||||||||
1969 | 11.05 | 20.45 | 25.23 | 49.05 | 59.74 | 61.22 | 71.84 | 71.26 | b | 62.03 | 46.32 | 33.53 | 20.00 | 44.31 | ||||||||||||
1970 | 6.30 | a | 16.71 | 27.21 | 46.07 | 60.58 | 69.95 | 72.10 | 68.97 | 60.42 | 49.77 | 33.36 | a | 18.14 | b | 44.13 | ||||||||||
1971 | 6.35 | 16.46 | 26.73 | 46.75 | 53.47 | 71.80 | 66.63 | a | 67.05 | 62.02 | 54.45 | a | 33.92 | 20.39 | 43.83 | |||||||||||
1972 | 7.31 | 12.38 | 27.47 | 41.73 | 59.74 | 63.47 | 66.21 | 67.24 | 57.35 | 44.24 | 31.74 | a | 12.37 | 40.94 | ||||||||||||
1973 | 15.58 | 19.66 | 38.21 | 43.38 | a | 52.65 | 64.92 | 70.13 | a | 67.42 | a | 57.79 | a | 55.18 | ----- | z | 17.79 | 45.70 | a | |||||||
1974 | 14.71 | 16.74 | a | 31.27 | 46.69 | a | 53.69 | 63.88 | 74.47 | 67.66 | 56.28 | a | 49.37 | a | 34.68 | 24.95 | 44.53 | |||||||||
1975 | 15.14 | b | 16.52 | a | 22.71 | 38.48 | 59.76 | 66.77 | 73.29 | 72.25 | a | 56.77 | 54.89 | d | 38.22 | e | 23.26 | 44.84 | ||||||||
1976 | 15.45 | 28.86 | 35.12 | a | 50.93 | c | 55.79 | 70.55 | 74.76 | b | 70.42 | a | 60.37 | 44.73 | 27.68 | 12.26 | b | 45.58 | ||||||||
1977 | 11.91 | t | 25.92 | i | 39.40 | 53.53 | 66.71 | 67.71 | a | 73.85 | 68.46 | d | 63.88 | 49.13 | a | 38.24 | c | 19.36 | b | 54.03 | b | |||||
1978 | ----- | z | 12.02 | c | 29.52 | 46.88 | 61.27 | 68.45 | 71.79 | 71.48 | 66.81 | a | 49.60 | 33.87 | 17.19 | e | 48.08 | a | ||||||||
1979 | 1.40 | 11.21 | 30.24 | 43.66 | b | 57.00 | a | 67.80 | 72.89 | 69.45 | ----- | z | 50.06 | 35.08 | 28.42 | a | 42.47 | a | ||||||||
1980 | 19.09 | d | 18.24 | 29.68 | 50.31 | a | 62.60 | a | 69.27 | 75.22 | a | 71.30 | a | 62.78 | a | 47.75 | a | 39.22 | 23.10 | 47.38 | ||||||
1981 | 21.55 | b | 26.46 | a | 39.37 | a | 52.54 | c | 58.33 | a | 69.37 | c | 75.46 | g | 72.32 | a | 61.67 | a | 47.63 | 37.55 | a | 19.33 | a | 46.01 | a | |
1982 | 6.86 | m | 18.91 | e | 31.00 | b | 42.63 | c | 63.41 | i | 62.50 | b | 73.17 | b | 69.27 | a | 59.81 | a | ----- | z | ----- | z | 24.74 | f | 51.04 | e |
1983 | 20.16 | 27.07 | a | 33.75 | a | 40.92 | d | 52.87 | h | 67.00 | e | 76.07 | a | 74.75 | e | 60.59 | c | 47.04 | e | 34.41 | g | 4.63 | e | 45.20 | b | |
1984 | 15.86 | i | 27.30 | f | 25.02 | f | 44.71 | f | 54.10 | b | 68.20 | c | 67.80 | c | 70.66 | c | 58.39 | h | 54.26 | j | 34.78 | e | 20.32 | k | 59.11 | g |
1985 | 13.40 | j | 15.47 | h | 36.88 | g | 52.94 | f | 62.04 | g | 63.42 | f | 70.96 | d | 67.54 | e | 60.80 | e | 49.27 | e | 28.00 | g | 6.00 | k | 62.14 | h |
1986 | 19.21 | j | 15.84 | i | 33.41 | i | 52.35 | g | 59.29 | e | 68.90 | d | 72.58 | e | 65.48 | f | 61.17 | f | 48.64 | f | 28.09 | h | 24.29 | g | 66.92 | i |
1987 | 21.38 | g | 29.22 | e | 37.67 | h | 52.89 | g | 62.13 | d | 70.15 | g | 74.27 | 67.83 | h | 61.88 | f | 41.88 | g | 37.55 | j | 25.50 | f | 55.21 | i | |
1988 | 11.63 | l | 14.29 | h | 33.36 | f | 44.17 | i | 62.83 | e | 69.08 | e | 73.62 | a | 73.21 | c | 60.73 | f | 41.46 | e | 33.94 | m | 21.13 | l | 64.04 | g |
1989 | 24.07 | i | 10.15 | k | 24.91 | h | 42.91 | g | 55.19 | e | 65.28 | e | 72.34 | b | 68.42 | 58.64 | a | 48.80 | a | 28.38 | a | 9.94 | 50.87 | d | ||
1990 | 24.61 | 22.07 | a | 35.24 | 46.03 | a | 54.78 | b | 66.92 | 69.67 | a | 69.12 | b | 63.04 | b | 47.37 | 39.65 | 20.39 | d | 46.57 | ||||||
1991 | 15.02 | a | 26.87 | b | 34.77 | a | 50.45 | a | 63.00 | a | 75.05 | a | 71.77 | 71.86 | c | 59.98 | 47.80 | c | 27.00 | b | 24.22 | a | 47.32 | |||
1992 | 24.80 | c | 30.28 | b | 33.88 | a | 44.13 | 60.02 | 65.75 | b | 65.71 | b | 66.56 | 60.15 | j | 47.73 | a | 31.87 | k | 22.22 | o | 48.76 | c | |||
1993 | 15.71 | n | 18.28 | l | 31.07 | d | 42.11 | k | 59.11 | i | 64.40 | i | 70.59 | h | 71.36 | f | 56.72 | n | 47.89 | m | 34.82 | k | 22.57 | k | 31.07 | k |
1994 | 7.77 | p | 17.31 | g | 36.23 | e | 45.37 | k | 59.90 | f | 70.09 | g | 68.50 | i | 66.54 | h | 65.00 | j | 51.33 | j | 36.47 | l | 28.84 | i | 36.23 | k |
1995 | 19.14 | i | 22.00 | l | 37.26 | j | 41.70 | j | 54.48 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.48 | k |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.05 | a | 67.89 | 68.02 | 60.19 | a | 48.32 | 25.19 | a | 16.76 | b | 50.35 | e | |||
1997 | 7.93 | b | 20.33 | a | 28.26 | 43.52 | 49.71 | 67.62 | 69.67 | a | 66.40 | b | 61.53 | a | 49.42 | a | 28.57 | a | 27.35 | a | 43.36 | |||||
1998 | 21.07 | b | 31.63 | a | 31.12 | a | 49.77 | b | 62.42 | 63.88 | b | 71.63 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.36 | e | |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.76 | a | 22.90 | 30.83 | j | |
2000 | 12.58 | 24.81 | 38.47 | 44.32 | 57.13 | a | 63.97 | 69.79 | 68.89 | 58.68 | 50.27 | 31.22 | 5.85 | 43.83 | ||||||||||||
2001 | 17.07 | a | 10.96 | 25.81 | 41.39 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.95 | i | ||
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.21 | x | 68.26 | d | 63.34 | a | 43.15 | 32.04 | e | 24.67 | a | 46.29 | g | |
2003 | 13.95 | a | 15.00 | a | 30.62 | b | 45.59 | a | 55.85 | a | 65.40 | 70.27 | 71.27 | a | 59.91 | c | 47.70 | a | 32.98 | c | 23.13 | a | 44.31 | |||
2004 | 11.03 | b | 17.48 | d | 35.00 | 46.88 | a | 54.89 | 64.12 | a | 69.22 | a | 63.88 | a | 63.93 | b | 48.65 | a | 36.38 | 22.50 | a | 44.50 | ||||
2005 | 14.92 | a | 24.80 | a | 28.55 | b | 49.03 | 53.73 | a | 72.29 | b | 73.03 | a | 68.85 | 64.13 | d | 50.34 | 35.29 | a | 16.02 | a | 45.92 | ||||
2006 | 28.03 | a | 18.50 | a | 31.63 | a | 50.63 | 57.97 | b | 67.23 | 74.74 | 69.84 | b | 57.43 | 42.92 | 35.33 | 28.13 | 46.87 | ||||||||
2007 | 18.48 | 9.98 | 34.75 | a | 44.83 | 61.98 | a | 69.12 | 71.81 | 69.53 | a | 62.30 | 52.88 | a | 32.73 | 15.27 | a | 45.31 | ||||||||
2008 | 10.97 | 10.64 | 23.73 | 40.47 | a | 48.67 | a | 62.20 | 69.63 | 66.95 | 61.48 | 46.27 | 31.52 | a | 11.18 | a | 40.31 | |||||||||
2009 | 2.07 | b | 18.41 | a | 30.43 | a | 43.83 | a | 56.27 | a | 64.62 | 64.90 | 65.61 | 62.36 | a | 42.06 | 39.70 | 15.74 | 42.17 | |||||||
2010 | 9.40 | 13.71 | 34.35 | d | 51.32 | 58.03 | a | 66.95 | 73.80 | a | 73.45 | 58.79 | b | 50.52 | 34.20 | 13.50 | 44.84 | |||||||||
2011 | 8.90 | 16.55 | 27.79 | 43.93 | 56.19 | 67.05 | b | 75.75 | a | 69.86 | b | 59.23 | 50.74 | 37.36 | b | 24.13 | 44.79 | |||||||||
2012 | 18.68 | c | 26.38 | 47.97 | a | 46.67 | a | 61.73 | a | 68.86 | a | 76.90 | 68.45 | 57.63 | c | 44.76 | 35.87 | c | 22.93 | a | 48.07 | |||||
2013 | 15.29 | 16.96 | b | 23.27 | 38.68 | 55.16 | 66.30 | 71.50 | 69.63 | 62.92 | 46.47 | 29.62 | b | 12.98 | 42.40 | |||||||||||
2014 | 5.24 | 3.55 | 22.69 | 41.14 | a | 56.21 | 68.80 | 68.31 | 70.60 | 60.70 | 45.97 | b | 25.33 | 24.00 | 41.04 | |||||||||||
2015 | 14.98 | 7.02 | 30.69 | 46.63 | 57.48 | 67.03 | 69.61 | 66.87 | 66.41 | b | 48.31 | 40.34 | b | 31.29 | 45.56 | |||||||||||
2016 | 13.21 | 21.80 | a | 37.52 | b | 45.85 | 56.50 | 67.58 | 71.94 | 71.15 | 63.88 | 51.52 | 42.03 | a | 18.90 | 46.82 | ||||||||||
2017 | 18.07 | a | 27.27 | b | 31.32 | 48.78 | 56.29 | 67.66 | b | 72.07 | a | 66.75 | a | 64.28 | 50.00 | 31.98 | 17.74 | 46.02 | ||||||||
2018 | 10.63 | 12.96 | 30.29 | 33.10 | 64.37 | 71.22 | 72.60 | 71.15 | 64.55 | 44.71 | 27.22 | 24.29 | 43.92 | |||||||||||||
2019 | 12.71 | 9.77 | 25.26 | 44.00 | 54.97 | a | 67.83 | 74.90 | 69.55 | 66.18 | 46.05 | 29.28 | 20.90 | 43.45 | ||||||||||||
2020 | 19.81 | 16.28 | 35.40 | 42.63 | 57.42 | 71.07 | 75.61 | 71.77 | 59.42 | 41.79 | 38.08 | 24.21 | 46.12 | |||||||||||||
2021 | 20.13 | 7.75 | 38.35 | 45.53 | a | 57.95 | 74.15 | 72.58 | 71.16 | 63.12 | 54.53 | 35.08 | 23.13 | 46.96 | ||||||||||||
2022 | 6.02 | 12.68 | 30.84 | 39.35 | 58.58 | 68.97 | 73.02 | 72.19 | 65.13 | 49.92 | 35.63 | 16.69 | 44.08 | |||||||||||||
2023 | 21.23 | 18.82 | 29.26 | 46.13 | 59.84 | f | 69.00 | n | 69.46 | r | 71.50 | l | 62.15 | j | 47.31 | d | 34.48 | 31.24 | 32.64 | e | ||||||
2024 | 20.05 | b | 32.57 | 37.40 | 46.73 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.01 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 14.08 | 18.31 | 31.64 | 45.43 | 57.53 | 67.44 | 71.54 | 69.30 | 61.03 | 48.50 | 34.00 | 19.95 | 44.63 | |||||||||||||
S.D. | 6.42 | 6.95 | 5.35 | 4.04 | 3.79 | 2.82 | 2.85 | 2.27 | 2.81 | 3.46 | 4.04 | 6.06 | 1.84 | |||||||||||||
SKEW | -0.11 | 0.23 | 0.21 | -0.44 | 0.08 | 0.27 | -0.36 | 0.08 | -0.02 | 0.23 | -0.32 | -0.43 | -0.37 | |||||||||||||
MAX | 28.03 | 32.57 | 47.97 | 53.53 | 66.71 | 75.05 | 76.90 | 74.75 | 66.81 | 57.87 | 42.03 | 31.29 | 48.07 | |||||||||||||
MIN | 1.40 | 3.55 | 19.14 | 33.10 | 48.67 | 61.22 | 64.90 | 63.88 | 54.48 | 41.46 | 25.19 | 4.63 | 40.31 | |||||||||||||
YRS | 47 | 49 | 52 | 48 | 51 | 52 | 53 | 51 | 49 | 52 | 49 | 49 | 36 |