YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 64.96 | c | 70.32 | a | 72.81 | 64.33 | 54.58 | 36.75 | 16.56 | 54.33 | e | |||||
1959 | 11.27 | 15.38 | 35.21 | e | 48.00 | b | 61.66 | b | 72.43 | 73.53 | 75.77 | 62.85 | 44.97 | 26.75 | j | 30.23 | g | 50.11 | b | |||||||
1960 | 17.06 | 18.98 | d | 18.89 | 47.80 | 58.92 | 66.97 | 73.16 | 72.81 | 63.75 | 51.66 | 37.47 | 20.53 | 45.67 | ||||||||||||
1961 | 15.79 | 23.77 | 33.18 | 41.37 | 55.94 | 69.97 | 70.71 | 72.58 | ----- | z | 53.03 | 33.47 | 19.25 | i | 46.98 | b | ||||||||||
1962 | 12.29 | 16.64 | 25.15 | ----- | z | 64.19 | b | 70.81 | l | 70.15 | 70.73 | 58.87 | 53.42 | 39.97 | 22.79 | 43.42 | b | |||||||||
1963 | 7.45 | 17.84 | ----- | z | 49.83 | 58.97 | 72.10 | 72.55 | 69.95 | 64.77 | 60.02 | 39.70 | 13.19 | 47.85 | a | |||||||||||
1964 | 23.90 | 26.12 | 25.48 | 47.48 | a | 62.60 | 70.70 | 76.16 | ----- | z | 61.28 | 51.05 | a | 35.98 | 15.65 | 45.13 | a | |||||||||
1965 | 12.08 | 14.66 | 19.08 | 44.25 | 61.82 | 69.10 | 72.87 | 68.97 | b | 54.18 | 53.24 | 34.15 | 29.38 | a | 44.48 | |||||||||||
1966 | 4.79 | 17.20 | 37.97 | 41.67 | 55.60 | 69.20 | 75.79 | 67.84 | 61.45 | 50.90 | 30.90 | 19.98 | 44.44 | |||||||||||||
1967 | 17.68 | 14.64 | 35.29 | 47.03 | 54.95 | 67.95 | 70.79 | 68.15 | 60.67 | 48.94 | 33.77 | 23.42 | 45.27 | |||||||||||||
1968 | 16.18 | 16.91 | 41.94 | 50.47 | 54.61 | 70.27 | 71.56 | 70.61 | 61.57 | 52.21 | 35.32 | 18.02 | 46.64 | |||||||||||||
1969 | 8.95 | 19.18 | 21.50 | 48.63 | 61.53 | 62.82 | 73.45 | 72.63 | 62.58 | 47.24 | 34.47 | 20.32 | 44.44 | |||||||||||||
1970 | 5.52 | 17.25 | 25.50 | 46.65 | 61.05 | 72.10 | 73.65 | 71.19 | 62.63 | 49.45 | 33.05 | 17.71 | 44.65 | |||||||||||||
1971 | 9.27 | 19.34 | 29.42 | 48.97 | 57.15 | 72.42 | 69.40 | 70.69 | 62.67 | 54.05 | 34.62 | 18.55 | 45.54 | |||||||||||||
1972 | 9.31 | 13.50 | 30.63 | 43.78 | 61.71 | 68.07 | 70.27 | 70.69 | 60.23 | 47.15 | a | 32.78 | 12.81 | 43.41 | ||||||||||||
1973 | 19.45 | 23.71 | 40.13 | 45.52 | 57.74 | 71.13 | 72.84 | 73.23 | 61.35 | 55.85 | 35.62 | 17.34 | 47.83 | |||||||||||||
1974 | 13.31 | 21.18 | 33.06 | 48.68 | 56.73 | 67.68 | 76.47 | 67.55 | a | 58.90 | 52.29 | 34.90 | 23.02 | 46.15 | ||||||||||||
1975 | 16.24 | 14.91 | a | 24.11 | 39.77 | 62.79 | 68.09 | a | 75.37 | 72.26 | 58.75 | 54.50 | 36.75 | 22.18 | 45.48 | |||||||||||
1976 | 15.98 | 30.45 | 34.32 | 52.30 | 59.60 | 71.57 | 75.73 | 72.03 | 62.88 | 44.97 | 28.88 | 15.03 | a | 46.98 | ||||||||||||
1977 | 2.98 | b | 25.36 | 38.53 | 55.13 | 67.45 | a | 70.38 | 74.60 | 66.84 | 62.93 | 48.53 | 31.57 | 16.16 | 46.71 | |||||||||||
1978 | 4.68 | 11.07 | 31.06 | 44.98 | 59.97 | a | 69.17 | 71.19 | 70.55 | 66.82 | 50.52 | 30.92 | 14.10 | 43.75 | ||||||||||||
1979 | 0.68 | 6.43 | 25.40 | 40.72 | 55.18 | 67.83 | 71.31 | 68.00 | 62.63 | 48.10 | 31.87 | 25.82 | 42.00 | |||||||||||||
1980 | 17.23 | 15.64 | 28.18 | 48.77 | 60.98 | 69.57 | a | 73.94 | 70.06 | 62.83 | 46.24 | 38.15 | 19.82 | 45.95 | ||||||||||||
1981 | 19.13 | 24.79 | 38.52 | 52.38 | 58.47 | 68.70 | 72.60 | 68.63 | ----- | z | 47.24 | 40.03 | 17.60 | 46.19 | a | |||||||||||
1982 | 4.29 | c | 18.36 | 31.90 | 43.60 | d | 60.83 | a | 64.68 | 74.98 | 70.26 | 61.57 | 50.39 | 31.48 | 26.55 | 44.91 | ||||||||||
1983 | 20.12 | a | 26.28 | a | 32.52 | 42.33 | 56.81 | b | 69.08 | 78.26 | b | 77.06 | 64.45 | 50.32 | 35.05 | 3.02 | a | 46.27 | ||||||||
1984 | 14.77 | a | 26.40 | 23.72 | a | 46.67 | 58.39 | 70.38 | 72.24 | n | 73.32 | n | 57.80 | j | 53.54 | h | 37.69 | i | 23.12 | j | 40.05 | f | ||||
1985 | 15.43 | i | 17.54 | e | 36.22 | h | 52.82 | k | 63.98 | h | 65.15 | f | 71.46 | h | 66.25 | e | 58.09 | g | 47.85 | h | 24.87 | g | 8.96 | h | 41.90 | j |
1986 | 21.67 | h | 17.65 | h | 39.95 | l | 49.74 | m | 60.63 | h | 71.36 | h | 72.54 | e | ----- | z | 61.02 | h | ----- | z | 28.45 | h | 24.57 | i | 72.54 | k |
1987 | 22.08 | l | 32.05 | g | 39.15 | k | 52.20 | g | 64.96 | h | 69.81 | c | 72.23 | c | ----- | z | 62.09 | h | 43.65 | h | 36.58 | j | 26.18 | f | 71.02 | j |
1988 | 8.80 | i | 13.53 | i | 34.74 | f | 47.75 | h | 68.17 | e | 77.14 | h | 77.32 | f | 73.93 | h | 64.52 | f | 45.50 | i | 35.61 | k | 24.10 | k | 68.17 | k |
1989 | 27.10 | k | 12.38 | l | 27.76 | j | 45.73 | h | 59.31 | e | 67.87 | g | 75.80 | d | 71.55 | a | 60.52 | 49.18 | 29.43 | b | 10.47 | 50.89 | e | |||
1990 | 27.30 | c | 23.48 | 35.48 | a | 46.40 | a | 56.69 | 71.19 | a | 70.79 | 71.03 | a | 65.55 | 47.83 | a | 35.38 | a | 15.82 | a | 47.25 | |||||
1991 | 10.20 | a | 26.40 | c | 31.89 | c | 48.10 | 60.47 | 73.10 | 72.72 | a | 71.08 | 60.95 | b | 47.73 | a | 22.76 | c | 22.48 | a | 45.66 | |||||
1992 | 23.00 | a | 27.22 | 34.17 | b | 41.95 | 60.42 | 65.93 | a | 65.16 | b | 65.48 | a | 59.74 | c | 47.66 | 30.33 | a | 18.35 | a | 44.95 | |||||
1993 | 11.75 | c | 13.80 | c | 26.75 | a | 42.33 | a | 56.14 | c | 65.75 | b | 69.66 | c | 69.62 | b | 55.57 | c | 45.63 | e | 30.12 | 20.98 | d | 42.34 | ||
1994 | 3.47 | b | 9.22 | c | 34.59 | d | 45.59 | b | 61.82 | c | 69.60 | a | 68.58 | a | 66.92 | 63.36 | a | 51.77 | 36.65 | 22.25 | a | 44.49 | ||||
1995 | 16.90 | 19.54 | a | 31.02 | a | 39.77 | 52.98 | c | 68.15 | 68.31 | j | 73.74 | b | ----- | z | 46.71 | e | 26.23 | b | 19.62 | a | 39.47 | b | |||
1996 | 7.93 | a | 17.98 | a | 24.39 | c | 40.28 | 53.44 | 68.71 | a | 69.76 | 68.43 | b | 59.28 | a | 49.16 | c | 23.52 | b | 11.58 | 41.20 | |||||
1997 | 8.50 | b | 19.96 | b | 30.73 | c | 40.31 | d | 52.43 | a | 70.48 | d | 71.43 | c | 68.07 | c | 62.75 | b | 50.66 | b | 27.15 | 26.22 | a | 44.06 | ||
1998 | 15.90 | 30.46 | a | 28.17 | a | 48.59 | a | 65.20 | d | 65.71 | b | 71.89 | 70.48 | e | 61.30 | o | 49.97 | m | 36.91 | a | 25.05 | a | 45.84 | b | ||
1999 | 10.55 | a | 27.02 | a | 33.42 | a | 46.38 | 59.76 | b | 66.65 | f | 75.42 | a | 69.26 | 61.26 | c | 48.00 | b | 41.02 | d | 25.03 | b | 45.19 | a | ||
2000 | 14.63 | a | 27.98 | a | 39.84 | 44.82 | b | 60.92 | 66.05 | a | 70.43 | a | 70.18 | 60.26 | c | 50.39 | c | 29.22 | a | 5.10 | 44.99 | |||||
2001 | 17.98 | 9.45 | 23.97 | 45.03 | a | 59.61 | 68.10 | d | 73.86 | f | 69.73 | 59.83 | c | 47.88 | a | 45.33 | d | 25.76 | b | 42.97 | a | |||||
2002 | 21.84 | c | 25.88 | 22.52 | c | 43.82 | 53.34 | c | 68.90 | 73.58 | 65.92 | 63.02 | e | 41.52 | g | 31.90 | a | 25.50 | 45.11 | a | ||||||
2003 | 15.57 | a | 15.34 | 29.42 | 45.78 | a | 55.50 | 65.45 | a | 71.28 | b | 71.46 | c | 58.95 | 48.12 | c | 31.09 | b | 23.45 | b | 44.28 | |||||
2004 | 12.90 | a | 16.68 | a | 35.16 | b | 47.48 | 56.37 | 62.78 | a | 67.45 | 62.06 | 63.42 | 47.80 | d | 37.27 | b | 22.58 | a | 44.33 | ||||||
2005 | 13.73 | a | 25.92 | c | 27.11 | 45.31 | d | 53.00 | o | 72.07 | 73.73 | 68.86 | j | 64.67 | c | 48.03 | b | 34.69 | d | 15.72 | b | 42.10 | b | |||
2006 | 25.53 | 17.09 | a | 29.35 | 51.33 | a | 59.95 | 67.95 | k | 73.58 | e | 69.70 | a | 58.17 | a | 45.71 | 34.37 | 27.37 | 44.74 | a | ||||||
2007 | 17.31 | 11.57 | 35.32 | 44.02 | c | 62.45 | b | 70.35 | 73.08 | a | 69.78 | a | 61.57 | 50.00 | b | 34.60 | a | 15.20 | i | 48.19 | a | |||||
2008 | 9.31 | j | 13.02 | 27.27 | c | 42.08 | 55.34 | 66.98 | 72.44 | 69.40 | 61.59 | a | 48.98 | 32.21 | a | 13.03 | 45.67 | a | ||||||||
2009 | 8.18 | 19.39 | 29.85 | 44.40 | 58.29 | 65.63 | 67.11 | 67.05 | 62.78 | a | 41.71 | 40.57 | 13.73 | a | 43.22 | |||||||||||
2010 | 7.66 | 12.34 | 34.18 | 52.92 | 58.05 | 67.70 | 73.58 | 74.58 | a | 57.97 | ----- | z | 32.67 | 14.19 | 44.17 | a | ||||||||||
2011 | 8.47 | 14.78 | a | 26.79 | 43.77 | 56.18 | 68.80 | 76.94 | 71.47 | 59.82 | 55.25 | a | 38.93 | 26.52 | 45.64 | |||||||||||
2012 | 21.82 | 27.12 | a | 49.19 | 51.98 | a | 65.56 | 72.40 | 78.76 | 71.00 | 62.88 | 46.93 | a | 37.50 | 20.92 | 50.51 | ||||||||||
2013 | 16.10 | a | 18.27 | 25.23 | a | 40.10 | 57.59 | b | 69.57 | a | 73.37 | 70.65 | a | 66.61 | b | 49.15 | 31.71 | b | 11.76 | 44.18 | ||||||
2014 | 9.71 | 8.55 | 25.24 | 43.77 | 57.11 | 68.70 | 69.47 | 70.53 | 61.93 | 48.52 | 24.73 | 22.89 | 42.60 | |||||||||||||
2015 | 17.97 | 11.23 | 34.35 | 47.82 | 57.84 | 67.95 | 71.19 | 68.05 | 66.38 | 50.74 | 39.77 | 26.89 | 46.68 | |||||||||||||
2016 | 14.77 | 23.76 | 38.23 | 47.62 | 58.89 | 72.45 | 75.19 | 72.92 | 65.35 | 51.11 | 43.00 | 18.71 | 48.50 | |||||||||||||
2017 | 20.35 | 32.00 | 31.45 | 47.65 | 57.05 | 70.07 | 72.52 | 65.97 | 64.37 | 49.60 | 31.68 | 19.85 | 46.88 | |||||||||||||
2018 | 13.77 | 11.29 | 28.31 | 32.62 | 64.79 | 70.77 | 72.37 | 70.68 | 64.05 | 44.03 | 26.10 | 22.28 | a | 43.42 | ||||||||||||
2019 | 12.19 | 7.07 | 25.48 | a | 45.37 | 53.63 | 68.87 | 72.98 | 68.76 | 65.80 | 45.89 | 30.48 | 21.77 | 43.19 | ||||||||||||
2020 | 17.85 | 18.24 | 35.84 | 44.08 | 57.45 | 73.22 | 74.50 | 72.06 | 61.55 | 43.08 | 38.92 | 25.10 | a | 46.82 | ||||||||||||
2021 | 22.11 | 9.68 | 39.76 | 46.58 | 59.08 | 74.03 | 73.40 | 71.82 | 65.92 | 55.58 | 38.15 | 24.81 | 48.41 | |||||||||||||
2022 | 7.47 | b | 14.00 | 33.19 | 41.90 | 62.90 | 73.88 | 75.19 | 70.05 | 63.08 | 49.24 | 33.95 | 14.90 | 44.98 | ||||||||||||
2023 | 16.84 | 16.36 | 23.26 | 43.73 | 61.47 | 71.78 | 70.40 | 71.31 | 65.67 | 50.65 | 36.62 | 31.82 | 46.66 | |||||||||||||
2024 | 17.56 | 31.97 | 34.76 | 45.90 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.10 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 13.80 | 18.83 | 30.94 | 45.60 | 59.05 | 69.19 | 72.63 | 70.15 | 62.10 | 49.54 | 34.04 | 19.69 | 45.25 | |||||||||||||
S.D. | 5.97 | 6.51 | 6.02 | 3.97 | 3.52 | 2.61 | 2.62 | 2.57 | 2.64 | 3.39 | 4.65 | 5.75 | 1.86 | |||||||||||||
SKEW | -0.04 | 0.20 | 0.30 | -0.23 | 0.38 | -0.36 | -0.19 | -0.22 | -0.51 | 0.43 | -0.21 | -0.51 | 0.30 | |||||||||||||
MAX | 27.30 | 32.00 | 49.19 | 55.13 | 68.17 | 74.03 | 78.76 | 77.06 | 66.82 | 60.02 | 45.33 | 31.82 | 50.51 | |||||||||||||
MIN | 0.68 | 6.43 | 18.89 | 32.62 | 52.43 | 62.78 | 65.16 | 62.06 | 54.18 | 41.71 | 22.76 | 3.02 | 41.20 | |||||||||||||
YRS | 60 | 62 | 60 | 59 | 61 | 59 | 61 | 60 | 57 | 58 | 60 | 58 | 43 |