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 | ----- | 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 | 40.08 | l | 53.16 | 68.53 | 69.10 | 72.92 | 58.68 | 48.52 | 30.08 | 11.50 | 51.56 | d | ||||||||
1962 | 4.84 | 8.19 | a | 24.42 | 38.87 | 56.74 | 64.88 | d | 66.78 | f | 68.57 | d | 56.87 | 50.50 | 35.43 | 17.71 | b | 38.82 | a | |||||||
1963 | 2.21 | 11.27 | 32.45 | 45.82 | 53.77 | 68.17 | 72.90 | 69.37 | 61.66 | a | 57.77 | 35.12 | 7.94 | 43.20 | ||||||||||||
1964 | 15.03 | a | 17.40 | 19.97 | 43.75 | 59.85 | 66.28 | 72.92 | 65.24 | 56.98 | 47.15 | 30.93 | a | 7.74 | b | 41.94 | ||||||||||
1965 | 2.39 | 6.86 | 13.26 | 40.38 | a | 56.15 | 63.90 | 68.47 | b | 67.71 | 49.58 | 47.92 | 28.10 | a | 21.81 | 38.88 | ||||||||||
1966 | -4.45 | c | 9.30 | 29.86 | b | 36.40 | 52.02 | 66.27 | 73.55 | 65.79 | 59.85 | 47.22 | a | 25.40 | 14.82 | 39.67 | ||||||||||
1967 | 9.78 | a | 5.35 | a | 25.94 | 41.33 | 49.40 | a | 63.20 | 69.17 | a | 66.72 | a | 60.10 | 45.17 | b | 28.98 | 16.55 | 40.14 | |||||||
1968 | 7.23 | 9.14 | 34.12 | a | 44.32 | 52.31 | 65.03 | 68.48 | 68.52 | 59.38 | a | 47.95 | 30.88 | a | 9.54 | d | 41.41 | |||||||||
1969 | 1.10 | 13.41 | 18.32 | a | 44.43 | 56.97 | 59.42 | 68.40 | 72.79 | 60.38 | 42.10 | 29.80 | 16.45 | 40.30 | ||||||||||||
1970 | 0.55 | 10.39 | 19.60 | 38.95 | 53.15 | 67.40 | 73.26 | 69.39 | 60.17 | 45.87 | 26.88 | 10.56 | 39.68 | |||||||||||||
1971 | -0.08 | 13.24 | a | 25.03 | 42.83 | 53.44 | 67.18 | 65.48 | 66.69 | 59.32 | 48.40 | 28.62 | 10.92 | a | 40.09 | |||||||||||
1972 | 0.39 | 3.19 | 22.52 | 38.55 | 59.89 | 65.32 | 67.47 | 68.13 | a | 55.92 | 42.77 | 26.62 | 5.19 | 38.00 | ||||||||||||
1973 | 12.94 | 16.27 | 36.35 | 42.92 | 55.40 | 65.78 | 68.29 | 71.65 | 56.70 | 51.18 | 28.20 | 11.40 | 43.09 | |||||||||||||
1974 | 4.02 | 10.86 | 21.42 | a | 42.37 | 50.98 | 64.68 | 74.56 | 64.77 | 54.32 | 48.77 | 31.02 | b | 22.18 | 40.83 | |||||||||||
1975 | 10.44 | 11.39 | 18.85 | 35.45 | 57.55 | 66.00 | 74.65 | 69.06 | 56.23 | 49.44 | 31.67 | 15.76 | 41.37 | |||||||||||||
1976 | 8.35 | 22.95 | 25.87 | 48.57 | a | 56.37 | a | 69.30 | 72.38 | b | 72.66 | 61.72 | a | 42.37 | 23.68 | 6.12 | b | 42.53 | ||||||||
1977 | -4.03 | a | 19.74 | e | 33.29 | 50.54 | b | 65.82 | 66.57 | b | 71.84 | 63.52 | a | 58.88 | 47.11 | 27.20 | 7.48 | 42.33 | ||||||||
1978 | -0.32 | 4.24 | c | 25.16 | 39.08 | d | 59.44 | 65.23 | 70.34 | 70.55 | 64.53 | 47.43 | a | 25.85 | 9.27 | 40.07 | ||||||||||
1979 | -4.95 | 2.39 | 23.42 | 34.89 | b | 49.50 | 64.83 | 69.53 | 66.05 | 61.65 | 44.58 | 28.55 | 22.81 | 38.60 | ||||||||||||
1980 | 7.72 | a | 10.64 | a | 19.98 | 47.62 | 61.42 | 65.92 | 71.97 | 67.65 | 58.22 | 43.78 | a | 34.13 | 14.74 | 41.98 | ||||||||||
1981 | 14.50 | 20.82 | 34.56 | 46.72 | a | 56.25 | a | 65.18 | 71.58 | 69.00 | 57.93 | 44.77 | 37.34 | a | 12.66 | 44.28 | ||||||||||
1982 | -4.64 | b | 11.37 | b | 23.16 | 40.32 | 59.03 | a | 61.48 | 72.53 | 68.84 | 57.90 | 47.08 | 26.40 | 22.48 | a | 40.50 | |||||||||
1983 | 14.95 | b | 22.36 | 30.29 | 41.97 | 54.40 | a | 65.48 | a | 75.32 | 75.68 | 60.32 | 46.33 | a | 31.10 | -0.78 | b | 43.12 | ||||||||
1984 | 8.07 | c | 25.27 | c | 21.76 | 46.21 | a | 55.32 | a | 66.77 | 72.18 | 73.32 | 54.98 | 48.78 | b | 31.08 | 11.94 | 42.97 | ||||||||
1985 | 6.07 | b | 10.70 | 32.40 | 47.71 | a | 61.68 | 61.43 | 70.37 | a | 64.85 | 55.00 | a | 46.27 | 19.14 | a | 5.79 | b | 40.12 | |||||||
1986 | 15.25 | a | 11.48 | a | 31.24 | 46.52 | 58.53 | a | 68.62 | 71.63 | 65.93 | a | 57.55 | 48.48 | a | 25.33 | c | 21.81 | b | 43.53 | ||||||
1987 | 17.80 | a | 28.00 | a | 33.53 | 53.21 | a | 61.98 | a | 71.30 | 73.83 | a | 68.81 | 60.45 | 43.58 | 34.98 | 21.63 | 47.43 | ||||||||
1988 | 6.92 | 9.47 | 29.21 | b | 46.27 | b | 64.94 | 73.75 | 76.97 | b | 71.50 | 60.52 | a | 43.35 | 28.98 | b | 15.07 | b | 43.91 | |||||||
1989 | 15.54 | d | 1.91 | a | 22.23 | 41.15 | 58.45 | a | 65.48 | 76.15 | 69.69 | 59.87 | 47.87 | 25.40 | 4.94 | 40.72 | ||||||||||
1990 | 22.19 | 17.86 | 31.93 | a | 44.45 | a | 54.84 | 67.35 | 69.81 | 69.77 | 63.45 | 46.10 | 34.45 | 12.66 | 44.57 | |||||||||||
1991 | 8.70 | a | 21.20 | a | 31.27 | a | 46.80 | 60.69 | 69.62 | 69.98 | a | 72.18 | a | 58.03 | 45.29 | 23.75 | 17.92 | a | 43.79 | |||||||
1992 | 17.68 | a | 24.02 | 31.35 | 41.38 | 59.63 | 63.48 | 64.16 | 65.66 | 58.43 | 45.94 | 27.22 | 12.33 | b | 42.61 | |||||||||||
1993 | 8.23 | 12.23 | 25.52 | a | 43.12 | 55.83 | a | 62.02 | a | 67.10 | 68.02 | a | 54.86 | b | 45.23 | 26.70 | 16.11 | 40.41 | ||||||||
1994 | -3.17 | a | 7.29 | 30.10 | 43.75 | 59.52 | 68.19 | a | 68.48 | 66.26 | 62.65 | 49.79 | 34.28 | a | 22.11 | 42.44 | ||||||||||
1995 | 11.92 | 12.87 | a | 29.39 | 39.04 | b | 55.55 | 70.50 | 70.79 | 71.24 | 59.21 | a | 44.76 | 23.27 | 14.06 | 41.88 | ||||||||||
1996 | 0.30 | a | 12.45 | 18.33 | b | 37.88 | 54.16 | 68.33 | 69.32 | 70.84 | 59.18 | 47.13 | 20.17 | 8.53 | 38.89 | |||||||||||
1997 | 3.57 | a | 15.20 | 23.69 | 39.57 | 52.48 | a | 69.10 | 70.18 | a | 68.06 | 63.48 | 49.72 | a | 26.05 | 24.45 | 42.13 | |||||||||
1998 | 12.59 | b | 29.23 | 28.65 | 49.28 | 62.17 | a | 63.73 | 70.90 | 72.13 | 66.17 | 49.08 | 32.50 | a | 21.11 | 46.46 | ||||||||||
1999 | 8.68 | 23.36 | 31.39 | 45.80 | 59.18 | 66.30 | 73.56 | 69.15 | 57.53 | 46.44 | 39.42 | 22.83 | a | 45.30 | ||||||||||||
2000 | 11.55 | a | 22.19 | 36.97 | 44.43 | 57.65 | a | 63.07 | a | 70.11 | 70.11 | 59.25 | 50.18 | a | 29.68 | 2.40 | a | 43.13 | ||||||||
2001 | 16.71 | 7.63 | b | 24.06 | 44.09 | a | 58.24 | 66.52 | a | 72.50 | 72.58 | 60.50 | c | 48.06 | 41.07 | c | 22.83 | d | 44.57 | |||||||
2002 | 18.72 | d | 25.77 | 20.05 | b | 39.57 | b | 50.67 | a | 70.23 | 74.81 | 68.90 | a | 63.93 | 38.02 | b | 26.54 | d | 20.32 | a | 43.13 | |||||
2003 | 3.05 | l | 8.93 | 23.78 | a | 44.85 | d | 55.38 | e | 65.23 | d | 71.13 | h | 73.48 | h | 60.08 | j | 47.05 | j | 25.67 | f | 20.46 | e | 36.44 | f | |
2004 | 2.61 | d | 12.67 | c | 29.13 | a | 42.32 | e | 51.25 | a | 61.61 | c | 67.72 | b | 61.88 | c | 63.85 | d | 46.79 | j | 31.95 | j | 22.24 | n | 43.67 | c |
2005 | 5.35 | d | 17.94 | b | 25.20 | d | 46.80 | c | 51.70 | c | 68.75 | 72.22 | b | 68.04 | c | 62.65 | f | 47.75 | c | 32.39 | h | 17.92 | l | 44.86 | c | |
2006 | 23.58 | g | 8.37 | b | 29.50 | f | 47.58 | f | 55.35 | g | 64.72 | n | 73.63 | d | 69.70 | d | 57.33 | j | 42.91 | o | 32.69 | l | 26.19 | m | 50.57 | i |
2007 | 13.41 | i | 8.20 | m | 33.74 | l | 37.53 | k | 55.75 | m | 66.43 | p | 72.80 | k | 66.72 | o | 61.92 | l | 51.63 | l | 27.89 | l | 8.26 | n | ----- | z |
2008 | 7.23 | g | 5.83 | h | 20.10 | a | 36.14 | h | 52.50 | h | 61.83 | o | 69.18 | n | 68.92 | k | 58.82 | k | 45.91 | d | 29.96 | b | 8.71 | n | 31.99 | i |
2009 | -2.58 | f | 12.19 | d | 22.66 | b | 38.90 | a | 53.06 | m | 62.64 | h | 64.55 | k | 69.04 | q | 62.90 | t | 38.94 | f | 37.98 | a | 11.63 | 24.67 | g | |
2010 | 8.35 | a | 10.75 | b | 34.16 | b | 49.12 | a | 54.00 | b | 61.04 | q | 71.54 | r | 70.78 | o | 54.94 | e | 48.48 | e | 30.25 | 11.25 | a | 33.48 | c | |
2011 | 3.35 | a | 12.48 | b | 20.35 | a | 40.78 | e | 52.27 | g | 62.59 | h | 73.00 | e | 69.92 | k | 57.30 | j | 49.52 | f | 31.71 | b | 23.22 | a | 29.27 | e |
2012 | 17.72 | b | 19.59 | b | 39.52 | b | 45.04 | c | 58.12 | e | 65.64 | e | 74.58 | g | 68.41 | h | 58.35 | d | 44.21 | e | 29.65 | c | 15.83 | b | 39.37 | b |
2013 | 8.95 | c | 10.41 | 17.23 | 30.98 | b | 52.45 | b | 62.81 | d | 70.52 | d | 69.15 | h | 61.77 | 44.55 | 26.50 | a | 2.31 | j | 38.62 | b | ||||
2014 | 1.63 | 2.43 | a | 19.17 | e | 36.45 | b | 52.38 | c | 64.91 | a | 66.68 | 67.68 | 58.15 | d | 47.10 | b | 21.23 | 19.83 | b | 38.14 | |||||
2015 | 15.22 | f | 3.79 | b | 28.62 | b | 43.12 | a | 53.30 | a | 64.18 | b | 70.19 | b | 67.18 | 64.63 | 48.48 | f | 36.43 | 23.81 | 45.52 | b | ||||
2016 | 11.56 | 19.98 | 36.11 | 41.42 | 56.68 | 66.21 | b | 69.45 | 68.97 | 60.95 | 47.57 | d | 39.90 | a | 14.10 | 44.41 | ||||||||||
2017 | 12.58 | 22.04 | 27.05 | 43.87 | g | 54.33 | b | 64.98 | 69.55 | a | 65.48 | a | 60.79 | b | 46.82 | a | 26.87 | 12.60 | 42.10 | a | ||||||
2018 | 6.79 | c | 6.83 | a | 28.58 | g | 30.83 | 61.00 | 67.52 | b | 70.40 | a | 67.53 | a | 58.95 | a | 39.85 | 21.60 | 20.65 | d | 41.09 | a | ||||
2019 | 2.26 | f | 2.15 | a | 20.32 | 42.20 | e | 49.68 | a | 64.79 | a | 70.81 | 65.71 | b | 60.69 | a | 41.50 | 25.60 | 14.66 | 41.65 | a | |||||
2020 | 11.35 | 13.63 | f | 27.61 | 38.25 | 52.76 | 67.88 | a | 71.58 | a | 68.87 | 57.20 | 39.52 | 32.59 | b | 20.22 | a | 44.35 | a | |||||||
2021 | 18.17 | a | 4.25 | 33.48 | 41.12 | 54.97 | 69.87 | 72.43 | c | 70.27 | c | 62.63 | 51.78 | a | 32.35 | 15.57 | a | 43.91 | ||||||||
2022 | 1.15 | 3.36 | 25.21 | b | 32.52 | a | 54.63 | a | 66.10 | a | 70.15 | 68.27 | 61.93 | 47.73 | 29.45 | 10.83 | a | 39.28 | ||||||||
2023 | 12.82 | 12.41 | 17.34 | 35.06 | c | 58.93 | c | 69.33 | a | 67.91 | b | 69.09 | b | 64.20 | 48.27 | c | 32.03 | a | 29.38 | b | 43.06 | |||||
2024 | 13.40 | 27.81 | 30.36 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.86 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.88 | 13.29 | 26.47 | 42.17 | 56.14 | 66.17 | 70.92 | 68.71 | 59.49 | 46.59 | 29.59 | 15.05 | 41.97 | |||||||||||||
S.D. | 6.85 | 7.35 | 5.98 | 4.71 | 3.83 | 2.71 | 2.63 | 2.69 | 3.09 | 3.24 | 4.85 | 6.40 | 2.20 | |||||||||||||
SKEW | -0.08 | 0.41 | 0.06 | -0.28 | 0.33 | 0.12 | -0.06 | 0.06 | -0.36 | 0.07 | 0.24 | -0.16 | 0.18 | |||||||||||||
MAX | 22.19 | 29.23 | 39.52 | 53.21 | 65.82 | 73.75 | 76.97 | 75.68 | 66.17 | 57.77 | 41.07 | 29.38 | 47.43 | |||||||||||||
MIN | -4.95 | 1.91 | 13.26 | 30.83 | 49.40 | 59.42 | 64.16 | 61.88 | 49.58 | 38.02 | 19.14 | -0.78 | 38.00 | |||||||||||||
YRS | 56 | 60 | 60 | 58 | 58 | 57 | 56 | 55 | 56 | 56 | 58 | 57 | 45 |