YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.17 | g | 49.00 | 47.73 | 31.29 | 19.33 | 8.68 | 31.21 | g | |||||
1950 | 16.39 | 23.21 | 21.23 | e | 26.34 | a | ----- | z | 39.03 | 56.35 | 46.90 | 41.80 | 34.16 | 20.70 | 13.10 | 30.84 | a | |||||||||
1951 | 12.65 | 16.21 | 17.61 | 28.90 | 34.55 | 37.20 | 53.16 | 53.90 | 39.87 | 33.42 | 21.93 | 16.90 | 30.53 | |||||||||||||
1952 | 20.58 | 14.90 | 15.61 | 30.80 | 36.42 | 43.03 | 51.67 | a | 52.77 | 43.57 | 32.13 | p | 12.46 | b | 19.84 | 31.06 | a | |||||||||
1953 | 19.19 | 11.29 | 23.00 | 26.50 | 29.94 | 41.60 | 53.94 | 48.65 | 36.90 | 26.29 | 18.17 | 7.42 | 28.57 | |||||||||||||
1954 | 12.10 | 13.64 | 20.77 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.00 | 34.35 | 22.53 | 15.68 | 23.30 | e | ||||||
1955 | 15.77 | 16.29 | 21.93 | c | 28.47 | 35.55 | k | ----- | z | ----- | z | ----- | z | 43.87 | g | 36.07 | b | 24.68 | e | 20.55 | i | 23.87 | f | |||
1956 | 26.06 | 16.34 | 20.59 | b | 29.18 | b | 34.44 | o | ----- | z | ----- | z | ----- | z | 42.42 | d | ----- | z | ----- | z | ----- | z | 26.92 | g | ||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | 37.96 | d | 42.90 | 55.52 | 54.48 | 45.67 | 35.20 | a | 28.77 | 24.45 | 40.62 | d | ||||||
1966 | 14.19 | 18.00 | 25.06 | 32.10 | 42.58 | 48.00 | 58.58 | 54.65 | 49.47 | 35.29 | 29.28 | a | 16.33 | a | 35.29 | |||||||||||
1967 | 8.87 | 19.79 | 26.97 | b | 27.97 | 36.06 | 45.97 | 58.29 | 53.97 | a | 48.57 | 31.06 | 26.63 | 10.45 | 32.88 | |||||||||||
1968 | 13.13 | 27.79 | a | 27.00 | 31.23 | 37.71 | 46.80 | 55.06 | 52.90 | 43.89 | b | 35.81 | 26.37 | 12.10 | a | 34.15 | ||||||||||
1969 | 23.35 | 23.07 | 21.42 | 29.93 | 39.61 | 44.87 | 58.26 | 59.42 | 50.27 | 34.97 | 26.40 | 22.84 | 36.20 | |||||||||||||
1970 | 16.47 | a | 23.71 | 23.35 | 24.30 | 36.84 | 47.77 | 56.90 | 57.23 | 46.90 | 32.13 | 24.50 | 19.90 | b | 34.17 | |||||||||||
1971 | 12.13 | 16.39 | 22.16 | 29.47 | 36.45 | 45.67 | 53.90 | 56.45 | 46.43 | 36.48 | 26.40 | 17.17 | b | 33.26 | ||||||||||||
1972 | 15.23 | 17.10 | 25.48 | 25.20 | 35.32 | 47.17 | 55.42 | 54.55 | 48.13 | 43.19 | ----- | z | 16.93 | b | 34.88 | a | ||||||||||
1973 | 17.29 | 27.75 | ----- | z | 28.87 | 39.06 | 45.20 | 54.03 | 53.77 | 43.37 | 34.52 | 25.33 | 17.34 | b | 35.14 | a | ||||||||||
1974 | 20.03 | 16.64 | 25.55 | 27.90 | 36.97 | a | 49.73 | 56.29 | 52.58 | 46.33 | 42.03 | 26.27 | 15.39 | 34.64 | ||||||||||||
1975 | 13.71 | 20.50 | 25.00 | 26.10 | 32.67 | a | 41.97 | 54.71 | 52.97 | 48.57 | 34.32 | 19.13 | 16.11 | l | 33.60 | a | ||||||||||
1976 | 16.29 | 23.90 | 22.65 | 29.43 | 40.10 | 45.69 | a | ----- | z | 54.19 | 49.60 | 33.93 | a | 22.03 | 15.69 | b | 32.14 | a | ||||||||
1977 | 11.29 | 20.46 | 20.55 | 30.97 | 34.19 | 48.60 | 57.26 | 54.35 | 47.83 | 37.26 | 24.93 | 21.03 | a | 34.06 | ||||||||||||
1978 | 20.74 | 23.39 | 29.10 | a | 34.07 | a | 38.06 | 49.81 | c | 55.07 | a | 52.47 | a | 46.93 | a | 37.07 | a | 31.67 | 12.97 | b | 35.95 | |||||
1979 | 13.81 | 17.30 | a | 24.03 | 27.71 | b | 37.55 | b | 44.07 | 49.32 | 48.71 | 46.72 | a | 36.03 | b | 22.07 | a | 16.71 | c | 32.00 | ||||||
1980 | 20.71 | 22.65 | c | 24.71 | 32.43 | b | 37.14 | c | 44.31 | a | 53.57 | c | 51.55 | b | 43.89 | b | 32.55 | 22.29 | f | 20.78 | d | 34.94 | a | |||
1981 | 21.93 | a | 19.64 | 25.84 | 34.61 | b | 39.37 | a | 48.07 | a | 57.16 | 55.76 | b | 48.90 | 37.86 | c | 25.57 | 19.57 | a | 36.19 | ||||||
1982 | 17.81 | 24.25 | 28.97 | b | 30.37 | 38.57 | a | 42.28 | a | 54.70 | d | 58.18 | c | 51.41 | a | 33.61 | 29.67 | 20.86 | c | 35.89 | ||||||
1983 | 20.55 | 24.72 | c | 28.27 | a | 28.00 | 36.10 | 42.87 | 54.10 | 59.28 | f | 48.68 | e | 38.74 | 26.36 | b | 24.59 | d | 33.91 | a | ||||||
1984 | 16.96 | c | 12.45 | g | 18.70 | h | 27.42 | d | 41.90 | k | 49.36 | h | 55.86 | c | 55.96 | f | 49.48 | c | 33.96 | e | 26.52 | c | 24.92 | f | 35.03 | f |
1985 | 20.77 | 20.18 | 30.46 | e | 33.60 | 37.62 | b | 47.66 | a | 56.32 | c | 54.48 | b | 45.22 | c | 39.94 | 28.86 | h | 24.00 | v | 38.63 | b | ||||
1986 | 23.78 | h | 27.73 | b | 31.73 | a | ----- | z | 47.33 | p | 52.00 | 56.29 | 57.35 | 47.17 | 36.15 | d | 29.28 | e | 23.48 | b | 40.13 | c | ||||
1987 | 13.59 | b | 24.85 | b | 25.48 | b | 34.33 | 41.13 | a | 48.41 | a | 52.13 | a | 56.03 | 44.69 | d | 39.79 | b | 27.90 | a | 19.03 | a | 35.61 | |||
1988 | 16.90 | a | 24.66 | 21.58 | e | 31.22 | c | 39.21 | c | 50.44 | c | 57.30 | a | 58.48 | 46.61 | g | 41.40 | a | 24.73 | 18.85 | d | 34.98 | a | |||
1989 | 15.68 | c | 23.36 | 28.46 | e | 33.20 | 40.15 | d | 46.07 | b | 56.42 | 55.62 | b | 50.27 | 36.14 | c | 23.13 | 14.16 | 35.22 | |||||||
1990 | 16.47 | a | 21.57 | 29.89 | d | 37.73 | h | 39.76 | b | 51.28 | a | 59.19 | e | 55.59 | d | 54.04 | c | 37.26 | 29.36 | b | 12.87 | 37.02 | a | |||
1991 | 20.45 | 26.32 | 27.03 | 29.04 | b | 37.00 | c | 46.57 | b | 54.83 | b | 58.35 | e | 48.15 | c | 37.27 | a | 26.82 | b | 22.50 | c | 36.19 | ||||
1992 | 15.06 | 27.04 | b | 30.73 | a | 36.30 | 45.81 | 46.73 | 54.03 | b | 55.33 | a | 46.87 | 39.14 | b | 22.23 | 17.23 | a | 36.38 | |||||||
1993 | 27.14 | c | 26.80 | c | 27.50 | a | 30.73 | 41.62 | b | 44.73 | 52.32 | 53.93 | b | 46.59 | a | 36.90 | a | 22.00 | b | 19.64 | c | 35.83 | ||||
1994 | 15.97 | b | 21.96 | a | ----- | z | 32.89 | b | 40.16 | 49.13 | 54.07 | b | 59.68 | 49.40 | 35.48 | 25.57 | 24.71 | 37.18 | a | |||||||
1995 | 25.07 | b | 27.43 | 30.40 | a | 30.59 | a | 37.77 | 45.83 | 54.19 | 59.73 | a | 49.83 | 33.71 | 30.86 | a | 22.40 | a | 37.32 | |||||||
1996 | 18.87 | a | 27.12 | d | 25.71 | 31.38 | d | 40.19 | 50.21 | a | 58.45 | b | 57.29 | 48.17 | 37.40 | f | 28.97 | a | 21.74 | 37.10 | a | |||||
1997 | 21.19 | 23.32 | 26.47 | a | 32.45 | a | 43.48 | b | 47.87 | 55.26 | 58.26 | 53.47 | 36.20 | a | 28.13 | 19.43 | c | 37.13 | ||||||||
1998 | 24.77 | a | 23.43 | 27.55 | 29.40 | 35.58 | 43.97 | 59.74 | 59.35 | 50.47 | 38.71 | 28.97 | 22.63 | a | 37.05 | |||||||||||
1999 | 17.83 | b | 19.80 | h | 25.85 | d | 27.56 | l | 38.33 | g | 46.48 | c | 58.93 | a | 57.42 | e | 50.19 | i | 35.04 | d | 29.83 | a | 15.32 | 35.84 | d | |
2000 | 21.35 | 24.93 | a | 28.16 | 34.93 | a | 41.81 | 52.39 | b | 59.81 | 58.03 | 51.20 | 41.90 | 23.84 | e | 19.84 | 38.18 | |||||||||
2001 | 20.62 | b | 23.96 | b | 27.94 | 35.20 | 43.10 | 47.70 | 61.03 | a | 58.68 | 50.17 | f | 39.48 | 29.45 | a | 23.28 | b | 37.31 | a | ||||||
2002 | 21.97 | 19.89 | 25.14 | b | 38.10 | 36.13 | a | 48.60 | 58.59 | n | 54.47 | a | 48.60 | j | 39.79 | b | 30.95 | i | 24.94 | m | 35.51 | d | ||||
2003 | 24.90 | a | 24.89 | 30.31 | b | 29.20 | e | 40.50 | a | 47.83 | 57.81 | e | 60.32 | c | 49.10 | a | 41.75 | g | 28.70 | g | 20.00 | f | 40.54 | c | ||
2004 | 23.00 | a | 24.83 | e | 36.35 | k | 29.91 | s | 37.37 | l | 46.90 | 53.57 | j | ----- | z | 43.18 | m | 38.53 | a | 30.30 | c | 17.15 | k | 32.71 | g | |
2005 | 31.10 | a | 31.00 | y | 27.70 | d | 32.28 | l | 41.52 | h | 46.26 | g | 53.77 | e | 56.74 | 49.96 | f | 41.52 | d | 21.73 | h | 10.16 | f | 42.17 | g | |
2006 | 14.10 | b | 19.44 | c | 20.89 | m | 34.80 | e | 42.29 | j | 51.90 | i | 59.36 | c | 57.84 | 46.00 | b | 38.58 | l | ----- | z | 17.60 | f | 38.59 | f | |
2007 | 18.90 | 24.33 | d | 26.74 | h | ----- | z | 40.22 | m | 46.29 | m | 59.08 | e | 59.50 | m | 51.25 | r | 32.19 | o | ----- | z | 22.64 | t | 34.10 | i | |
2008 | 13.00 | n | 22.54 | c | 23.19 | d | ----- | z | 36.59 | i | 46.53 | 58.55 | b | 56.30 | k | 48.00 | j | 35.88 | g | 26.38 | i | 21.25 | g | 37.70 | h | |
2009 | 21.85 | e | 21.15 | h | 24.42 | ----- | z | 42.65 | h | 45.58 | d | ----- | z | 52.93 | c | 46.95 | h | 23.44 | m | 17.00 | e | ----- | z | 32.35 | g | |
2010 | 17.79 | b | 22.44 | c | 23.60 | a | 31.18 | b | 33.32 | 44.12 | f | 58.65 | h | 56.96 | c | 48.92 | e | 41.09 | h | 19.83 | g | 25.00 | e | 32.40 | d | |
2011 | 14.38 | e | 18.11 | 23.97 | a | 28.50 | r | 39.11 | l | 46.77 | h | 59.77 | e | 61.00 | s | 53.17 | f | 36.08 | f | 27.30 | c | 20.44 | d | 27.33 | f | |
2012 | 18.38 | o | 19.56 | b | 23.28 | b | 33.83 | 39.20 | a | 47.80 | 57.71 | 58.48 | 48.93 | 34.83 | a | 27.73 | 17.90 | b | 37.20 | a | ||||||
2013 | 15.45 | b | 19.04 | 25.42 | e | 30.28 | a | 37.65 | e | 45.50 | h | 58.71 | 57.58 | 52.48 | c | 31.88 | g | 27.96 | e | 17.79 | b | 34.24 | b | |||
2014 | 12.13 | h | 21.95 | g | 26.26 | 32.63 | 37.26 | d | 43.47 | 59.67 | a | 54.63 | a | 53.21 | b | 41.50 | c | 24.47 | 24.00 | a | 39.71 | b | ||||
2015 | 23.13 | 26.29 | 29.74 | 30.63 | 41.10 | 51.52 | c | 56.66 | b | 56.68 | 49.72 | a | 43.00 | b | 26.13 | 17.44 | d | 37.67 | ||||||||
2016 | 20.00 | a | 22.14 | 26.73 | a | 31.53 | 38.41 | b | 52.50 | 57.14 | c | 56.29 | 47.43 | g | 40.79 | b | 32.17 | a | 25.34 | b | 36.64 | a | ||||
2017 | 24.58 | 28.30 | a | 30.23 | 30.93 | 39.10 | 49.63 | 58.19 | 54.65 | 47.60 | 35.48 | 29.53 | 15.84 | f | 38.93 | a | ||||||||||
2018 | 21.00 | d | 23.00 | e | 25.90 | a | 34.40 | e | 39.48 | 49.50 | b | 59.63 | a | 56.56 | f | 49.85 | j | 36.57 | q | 21.88 | f | 19.30 | h | 36.13 | e | |
2019 | 19.22 | h | 20.90 | g | 30.42 | l | 33.67 | l | 36.86 | j | 46.27 | 55.29 | 54.87 | 50.06 | m | 34.72 | m | 28.26 | g | 21.23 | a | 44.42 | h | |||
2020 | 19.33 | a | 22.68 | a | 29.71 | 31.87 | 41.03 | 47.74 | g | 57.52 | 55.71 | 45.14 | a | 34.81 | 29.28 | a | 14.55 | 34.69 | a | |||||||
2021 | 15.39 | 19.54 | 24.16 | 30.48 | c | 35.13 | a | 50.17 | 58.43 | a | 56.03 | 49.70 | 36.03 | 26.30 | 24.90 | 35.52 | ||||||||||
2022 | 17.35 | 15.86 | 23.94 | 28.37 | 37.23 | 50.70 | 58.39 | 58.32 | c | 52.27 | 37.74 | 20.83 | 22.07 | b | 35.25 | |||||||||||
2023 | 19.55 | 16.46 | 26.00 | 28.10 | 38.19 | 43.10 | 56.11 | d | 57.07 | b | 48.96 | b | 37.73 | a | 28.30 | 20.77 | a | 35.03 | ||||||||
2024 | 18.23 | a | 26.07 | 27.58 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.96 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.54 | 21.82 | 25.58 | 30.74 | 38.26 | 46.73 | 56.40 | 55.48 | 47.64 | 36.63 | 25.67 | 18.76 | 35.04 | |||||||||||||
S.D. | 4.31 | 4.04 | 3.34 | 2.90 | 2.88 | 3.26 | 2.44 | 2.92 | 3.36 | 3.31 | 3.97 | 4.33 | 2.16 | |||||||||||||
SKEW | 0.33 | -0.42 | -0.49 | 0.15 | -0.13 | -0.49 | -0.42 | -0.81 | -0.69 | -0.19 | -0.94 | -0.55 | -1.26 | |||||||||||||
MAX | 31.10 | 28.30 | 31.73 | 38.10 | 45.81 | 52.50 | 61.03 | 60.32 | 54.04 | 43.19 | 32.17 | 25.34 | 38.18 | |||||||||||||
MIN | 8.87 | 11.29 | 15.61 | 24.30 | 29.94 | 37.20 | 49.32 | 46.90 | 36.90 | 26.29 | 12.46 | 7.42 | 28.57 | |||||||||||||
YRS | 61 | 60 | 59 | 54 | 51 | 55 | 58 | 57 | 53 | 54 | 54 | 52 | 27 |