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 | 24.13 | 23.07 | 22.52 | 23.24 | i | |||
1947 | 11.19 | 20.93 | 22.71 | 26.40 | 35.19 | 37.70 | 41.87 | 38.13 | 32.63 | 34.42 | 25.33 | 19.29 | 28.82 | |||||||||||||
1948 | 15.61 | 16.59 | 21.61 | 26.20 | 32.00 | 41.57 | 39.84 | 37.53 | a | 31.73 | 24.06 | 21.97 | 10.87 | 26.63 | ||||||||||||
1949 | -5.27 | a | 18.46 | 25.87 | 25.38 | a | 36.03 | a | 35.53 | 39.55 | 38.61 | 34.20 | 20.68 | 22.57 | 16.03 | 25.64 | ||||||||||
1950 | 12.03 | 20.59 | a | 22.81 | 22.83 | 28.74 | 37.63 | 41.77 | 39.94 | 33.87 | 31.32 | 27.93 | 27.19 | 28.89 | ||||||||||||
1951 | 15.42 | 23.21 | 19.39 | 23.70 | 32.71 | 34.63 | 41.03 | 37.13 | 33.43 | 28.06 | 21.87 | 13.94 | 27.04 | |||||||||||||
1952 | 12.97 | a | 19.62 | 22.39 | 25.73 | 33.74 | 38.40 | 43.37 | a | 39.58 | 34.53 | 26.68 | 9.83 | 17.90 | 27.06 | |||||||||||
1953 | 29.55 | 21.50 | 21.71 | 24.73 | 29.39 | 34.87 | 39.94 | 41.17 | a | 35.71 | b | 24.68 | 29.53 | 20.55 | 29.44 | |||||||||||
1954 | 21.58 | 23.26 | a | 17.61 | 25.03 | 30.10 | 35.79 | b | 39.42 | 37.81 | 30.07 | 22.47 | a | 22.97 | 13.83 | a | 26.66 | |||||||||
1955 | 9.81 | 15.64 | 20.71 | 23.37 | 29.13 | 37.80 | 38.42 | 36.58 | 30.47 | 27.47 | a | 22.17 | a | 21.40 | a | 26.08 | ||||||||||
1956 | 17.32 | c | 14.83 | 23.26 | 26.43 | 35.58 | 34.67 | 42.61 | 38.56 | d | 31.73 | 27.29 | 16.35 | d | 15.32 | 27.00 | ||||||||||
1957 | 4.42 | 20.29 | 27.00 | 26.55 | a | 35.58 | 38.07 | 39.19 | 36.10 | 34.77 | 30.19 | 16.97 | a | 20.47 | a | 27.47 | ||||||||||
1958 | 22.26 | 29.21 | 20.87 | 26.67 | 35.06 | 41.40 | 43.35 | 43.48 | 33.20 | 25.35 | 20.59 | a | 23.39 | 30.40 | ||||||||||||
1959 | 22.32 | 21.00 | 19.84 | 24.62 | a | 27.58 | 37.73 | 41.55 | 37.90 | 35.10 | 28.97 | a | 16.27 | 9.61 | 26.87 | |||||||||||
1960 | 13.63 | a | 18.41 | 24.65 | 25.57 | 30.35 | 33.87 | 42.48 | 37.77 | 32.60 | 27.03 | 21.77 | 15.94 | 27.01 | ||||||||||||
1961 | 19.81 | 26.82 | 26.84 | 24.90 | 32.00 | 41.03 | 41.48 | 45.84 | 30.04 | d | 26.71 | 17.77 | 21.90 | 29.60 | ||||||||||||
1962 | 10.16 | 21.43 | 22.87 | 26.70 | 32.23 | 35.07 | 39.06 | 38.37 | a | 34.47 | 27.93 | a | 25.00 | 22.55 | 27.99 | |||||||||||
1963 | 7.81 | 28.68 | 22.32 | 25.60 | 35.19 | 37.67 | 38.81 | 39.42 | 39.27 | 28.58 | 25.83 | 18.00 | 28.93 | |||||||||||||
1964 | 18.65 | 17.14 | 21.26 | 22.50 | 27.84 | 37.50 | 43.84 | 37.39 | 28.40 | 25.23 | 21.13 | 22.55 | 26.95 | |||||||||||||
1965 | 23.61 | 21.18 | 17.10 | 29.67 | 28.94 | 38.23 | 41.23 | 42.32 | 27.50 | 26.26 | 25.47 | 14.65 | 28.01 | |||||||||||||
1966 | 19.68 | 21.43 | 22.00 | 24.00 | 31.33 | a | 36.67 | 37.77 | 38.42 | 34.62 | a | 23.11 | c | 26.47 | 23.15 | e | 28.22 | |||||||||
1967 | 23.60 | a | ----- | z | ----- | z | 22.72 | l | 30.64 | f | 38.23 | d | 43.97 | b | 43.04 | d | 34.58 | d | 26.04 | h | 22.41 | a | ----- | z | 34.30 | f |
1968 | ----- | z | 25.14 | g | ----- | z | ----- | z | 32.61 | m | 39.12 | n | 44.67 | j | ----- | 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 | 18.63 | 17.71 | 18.17 | j | ||
1983 | 25.60 | a | 28.31 | b | 30.77 | 25.70 | 33.03 | 36.93 | a | 41.23 | 44.64 | c | 32.17 | a | 29.39 | 28.70 | 17.68 | 31.18 | ||||||||
1984 | 15.77 | 23.12 | d | 27.87 | a | 27.66 | a | 32.58 | 37.77 | 45.08 | e | 42.53 | a | 33.83 | 29.71 | 26.70 | 12.27 | a | 29.57 | |||||||
1985 | 10.97 | 16.54 | b | 22.00 | 27.04 | c | 32.77 | 39.27 | 48.35 | e | 39.90 | 33.17 | 26.87 | 15.47 | 9.10 | 26.79 | ||||||||||
1986 | 27.13 | 28.00 | 26.81 | 24.89 | c | 34.45 | 44.60 | 39.84 | 45.81 | 33.77 | 26.77 | a | 27.57 | 19.00 | c | 31.55 | ||||||||||
1987 | 15.81 | 24.19 | a | 26.65 | 28.73 | 37.26 | 42.34 | a | 42.13 | 38.97 | 33.23 | 25.00 | 23.77 | 19.19 | 29.77 | |||||||||||
1988 | 16.74 | d | 21.31 | 22.45 | 31.24 | a | 32.87 | a | 41.50 | 44.42 | 38.76 | b | 32.10 | 30.26 | 27.70 | 13.35 | h | 30.85 | a | |||||||
1989 | 17.71 | 11.86 | 28.48 | 31.32 | b | 32.32 | 40.45 | a | 41.84 | 40.52 | 34.07 | 26.67 | a | 21.70 | 14.35 | 28.44 | ||||||||||
1990 | 24.26 | 18.39 | 24.07 | b | 31.37 | 30.93 | a | 39.44 | c | 45.86 | c | 44.70 | a | 37.14 | b | 28.13 | 24.66 | a | 9.79 | c | 29.89 | |||||
1991 | 16.23 | 21.62 | g | 23.27 | a | 27.87 | 32.82 | c | 37.07 | b | 46.43 | a | 46.36 | c | 35.38 | a | 28.07 | a | 28.14 | a | 19.44 | f | 32.16 | b | ||
1992 | 19.57 | a | ----- | z | ----- | z | 33.92 | e | 37.36 | c | 44.70 | c | 44.03 | 42.71 | 36.52 | a | 30.16 | 21.50 | b | ----- | z | 34.50 | c | |||
1993 | 10.93 | c | 8.39 | e | 27.63 | d | 28.28 | e | 36.17 | b | 38.75 | b | 38.53 | a | 39.74 | 32.31 | a | 29.23 | i | 11.73 | 19.13 | 26.51 | a | |||
1994 | 23.04 | e | 17.93 | 23.32 | c | 29.88 | e | 37.00 | 37.56 | c | 45.28 | b | 40.03 | a | 37.25 | b | 26.04 | h | 18.78 | g | 15.64 | f | 32.36 | c | ||
1995 | 25.50 | k | 23.60 | m | 19.96 | g | 25.00 | f | 32.03 | ----- | z | 42.88 | f | 40.45 | 36.43 | b | ----- | z | ----- | z | 22.63 | d | 32.89 | h | ||
1996 | 24.93 | d | 20.70 | i | 24.60 | f | 28.26 | c | 32.55 | b | ----- | z | 42.93 | d | 41.67 | a | 32.79 | a | 27.45 | b | 26.15 | c | 25.08 | g | 32.09 | d |
1997 | 19.68 | l | 22.48 | g | 27.40 | f | 27.59 | h | 36.08 | e | 38.33 | i | 42.57 | c | 44.52 | b | ----- | z | 27.43 | h | 28.78 | l | 15.14 | j | 41.06 | i |
1998 | 28.96 | f | 25.89 | i | 25.14 | i | 26.50 | n | 34.95 | k | 38.96 | b | 45.95 | k | 43.08 | f | 35.17 | l | 22.50 | i | 28.09 | g | 15.00 | l | 38.96 | k |
1999 | 16.00 | p | 18.60 | m | 22.53 | l | 23.25 | f | 30.67 | m | ----- | z | 39.46 | e | 43.38 | j | 30.32 | e | 24.00 | q | 27.44 | l | 18.48 | h | 34.89 | j |
2000 | 23.23 | e | 28.62 | c | 22.25 | c | 28.61 | g | ----- | z | ----- | z | 43.36 | f | 40.97 | b | 35.48 | c | 27.90 | b | 19.55 | h | 17.00 | f | 29.74 | f |
2001 | 19.75 | c | 20.17 | d | 26.63 | d | 26.52 | c | 34.90 | 37.61 | b | 45.44 | d | 45.14 | c | 37.00 | e | 27.44 | f | 23.62 | d | 24.50 | g | 31.68 | b | |
2002 | 22.04 | f | ----- | z | 20.66 | b | 27.13 | g | 30.14 | i | 41.25 | f | 45.93 | a | 37.27 | e | 33.12 | f | 20.64 | c | 22.43 | g | 22.54 | g | 31.13 | h |
2003 | 28.96 | e | 20.42 | d | 28.00 | i | 26.41 | h | 34.81 | d | ----- | z | 48.79 | g | 44.12 | e | 35.67 | f | 32.05 | j | 21.50 | d | 23.77 | i | 29.96 | g |
2004 | 24.81 | d | 21.15 | i | 24.29 | g | 25.44 | e | 31.55 | k | 39.92 | d | 44.00 | h | 45.40 | f | 33.17 | f | 29.59 | i | 22.47 | k | 22.29 | n | 30.06 | i |
2005 | 20.08 | g | 17.96 | e | 23.04 | e | 21.71 | f | 32.09 | h | 31.41 | h | 42.17 | g | 40.58 | g | 29.18 | h | 24.65 | h | 21.45 | h | 12.35 | h | 20.50 | j |
2006 | 24.73 | i | 15.12 | k | 21.36 | f | 21.52 | i | ----- | z | 42.95 | j | 48.10 | j | 37.04 | h | 33.95 | j | 25.35 | n | ----- | z | 13.58 | s | ----- | z |
2007 | 10.57 | h | 22.58 | d | 22.95 | j | 22.05 | i | 28.88 | g | 37.90 | i | 49.44 | f | 35.95 | i | 26.56 | l | 25.79 | g | 18.14 | i | 15.70 | k | 22.58 | k |
2008 | 15.40 | f | 16.55 | i | 20.36 | q | 17.09 | h | 31.28 | m | 28.33 | f | 38.44 | o | 43.00 | a | 33.10 | 29.13 | 26.41 | a | 14.83 | b | 29.29 | g | ||
2009 | 20.57 | a | 24.29 | 23.77 | 26.40 | 36.48 | 41.67 | 45.90 | 43.10 | 35.87 | 28.94 | 23.37 | 13.06 | 30.28 | ||||||||||||
2010 | 30.07 | a | 27.14 | 23.10 | 25.43 | 32.61 | 41.03 | 44.03 | 43.50 | a | 36.60 | 33.06 | 24.43 | b | 22.80 | a | 31.98 | |||||||||
2011 | 18.14 | b | 21.37 | a | 29.45 | 25.37 | 31.84 | 39.10 | 41.35 | h | 42.26 | 36.38 | a | 27.65 | 20.81 | c | 10.23 | 27.51 | a | |||||||
2012 | 19.03 | 21.34 | 24.61 | 29.90 | 31.39 | 35.57 | 44.16 | 42.42 | 34.47 | 27.06 | 26.73 | 17.87 | a | 29.55 | ||||||||||||
2013 | 10.97 | 20.14 | 22.39 | 25.03 | 32.39 | 40.03 | 46.26 | 42.06 | 38.17 | 22.19 | 21.93 | 6.87 | 27.37 | |||||||||||||
2014 | 17.71 | 24.79 | 24.97 | 27.03 | 33.06 | 38.60 | 48.03 | 44.52 | 38.03 | 32.23 | 24.97 | 25.81 | 31.65 | |||||||||||||
2015 | 21.96 | e | 24.61 | 24.61 | 23.20 | 35.42 | 44.67 | 46.84 | 44.00 | 33.93 | 33.48 | 17.40 | 21.35 | 30.96 | ||||||||||||
2016 | 19.68 | 25.24 | 27.45 | 30.50 | 36.48 | 40.40 | 42.94 | 42.26 | 33.97 | 34.87 | 29.17 | 12.42 | 31.28 | |||||||||||||
2017 | 9.68 | 25.29 | 30.26 | 26.73 | 32.68 | 41.47 | 48.81 | 46.58 | 38.07 | 25.48 | 26.87 | 14.13 | 30.50 | |||||||||||||
2018 | 25.13 | 19.14 | 23.26 | 29.17 | 38.35 | 38.93 | 46.23 | 43.84 | 31.87 | 28.45 | 19.17 | 17.87 | 30.12 | |||||||||||||
2019 | 22.94 | 17.81 | a | 20.68 | 32.60 | 35.90 | 37.72 | a | 43.77 | 45.35 | 37.47 | 21.77 | 17.53 | 20.55 | 29.51 | |||||||||||
2020 | 24.35 | 16.24 | 21.10 | 27.53 | 35.19 | 40.53 | 44.65 | 45.48 | 36.00 | 26.42 | 20.07 | 17.42 | 29.58 | |||||||||||||
2021 | 21.29 | 22.75 | 19.52 | 25.50 | 34.10 | 44.97 | 50.32 | 44.06 | 36.20 | 30.19 | 24.87 | 21.65 | 31.28 | |||||||||||||
2022 | 20.03 | a | 14.71 | 24.65 | 24.20 | 32.91 | i | 40.20 | 47.90 | 48.19 | 37.80 | 28.06 | 11.43 | 12.42 | 28.15 | a | ||||||||||
2023 | 16.65 | 15.14 | 19.58 | 26.90 | 38.35 | 41.67 | 46.87 | 47.10 | 35.87 | 26.53 | a | 20.93 | 25.94 | 30.13 | ||||||||||||
2024 | 26.13 | 24.48 | 21.52 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.04 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.44 | 21.03 | 23.52 | 26.80 | 33.39 | 38.97 | 43.20 | 41.64 | 34.25 | 27.46 | 22.39 | 17.60 | 28.90 | |||||||||||||
S.D. | 6.72 | 4.46 | 3.10 | 2.57 | 2.69 | 2.70 | 3.07 | 3.12 | 2.55 | 3.23 | 4.56 | 4.91 | 1.76 | |||||||||||||
SKEW | -0.87 | -0.27 | 0.38 | 0.76 | -0.21 | 0.36 | 0.18 | 0.07 | -0.39 | 0.06 | -0.77 | -0.18 | -0.04 | |||||||||||||
MAX | 30.07 | 29.21 | 30.77 | 33.92 | 38.35 | 44.97 | 50.32 | 48.19 | 39.27 | 34.87 | 29.53 | 27.19 | 31.98 | |||||||||||||
MIN | -5.27 | 8.39 | 17.10 | 22.50 | 27.58 | 33.87 | 37.77 | 36.10 | 27.50 | 20.64 | 9.83 | 6.87 | 25.64 | |||||||||||||
YRS | 54 | 51 | 51 | 50 | 51 | 51 | 52 | 56 | 54 | 50 | 53 | 47 | 40 |