YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 47.40 | o | 39.36 | f | 20.12 | f | 13.50 | a | 13.50 | k |
1957 | 20.23 | 23.15 | a | 32.08 | e | 36.20 | e | 42.37 | d | 49.96 | g | 61.17 | h | 60.25 | g | 45.58 | f | 43.73 | a | 28.63 | c | 21.48 | b | 30.98 | d | |
1958 | 16.07 | c | 29.62 | g | 31.26 | d | 35.24 | a | 45.07 | a | 55.20 | e | 62.17 | b | 59.50 | q | 51.46 | d | 38.00 | a | 27.97 | 19.71 | j | 40.27 | c | |
1959 | 19.35 | 27.33 | a | 29.71 | 38.31 | a | 48.86 | b | 59.50 | b | 62.19 | 59.55 | b | 50.57 | 38.07 | a | 24.31 | a | 20.13 | 39.82 | ||||||
1960 | 17.23 | 21.00 | a | 31.00 | a | 37.93 | 44.33 | a | 52.93 | b | 58.82 | i | 56.72 | b | 53.31 | d | 39.94 | 30.63 | 19.71 | 36.79 | a | |||||
1961 | 13.06 | 23.96 | 31.55 | 37.83 | 46.18 | c | 58.03 | a | 60.53 | a | 60.33 | a | 45.30 | 37.61 | 28.57 | 15.45 | b | 38.20 | ||||||||
1962 | 15.03 | 29.74 | a | 26.52 | 40.55 | a | 46.73 | a | 53.17 | 59.34 | b | 58.17 | a | 50.52 | a | 40.24 | b | 29.48 | a | 15.29 | 38.73 | |||||
1963 | 3.42 | 24.64 | c | 29.32 | c | 34.64 | b | 47.32 | c | 53.21 | b | 61.73 | a | 60.47 | a | 51.37 | c | 43.36 | c | 29.29 | b | 14.20 | a | 37.75 | ||
1964 | 13.17 | b | 14.64 | d | 24.33 | a | 37.87 | 45.48 | h | 53.90 | 65.17 | a | 56.72 | m | 51.71 | b | 39.41 | b | 28.38 | a | 22.14 | c | 35.07 | b | ||
1965 | 24.67 | a | 23.28 | c | 29.07 | b | 38.83 | 44.07 | c | 51.04 | e | 59.72 | f | 58.00 | f | 48.77 | 37.75 | c | 34.57 | b | 23.32 | 35.54 | b | |||
1966 | 18.19 | 22.15 | a | 29.33 | a | 36.61 | b | 48.82 | c | 56.37 | c | 63.10 | a | 59.59 | b | 51.11 | c | 37.34 | b | 32.21 | a | 22.32 | 39.76 | |||
1967 | 15.81 | 26.41 | a | 36.00 | b | 38.30 | c | 44.58 | e | 52.61 | b | 62.68 | c | 60.18 | c | 50.74 | g | 39.79 | c | 28.93 | a | 14.93 | a | 38.20 | a | |
1968 | 7.00 | 30.85 | c | 31.33 | a | 35.07 | 46.00 | a | 55.07 | c | 61.83 | a | 55.83 | a | 46.86 | b | 40.29 | 28.70 | 14.73 | a | 37.80 | |||||
1969 | 24.10 | 26.18 | 27.30 | a | 38.21 | a | 48.90 | b | 52.45 | a | 62.72 | b | 62.27 | a | 54.57 | 36.23 | a | 25.17 | a | 22.24 | b | 40.03 | ||||
1970 | 20.55 | b | 24.57 | 30.11 | c | 33.62 | a | 46.40 | a | 54.07 | 63.10 | a | 63.52 | 49.30 | 36.63 | a | 30.25 | b | 24.74 | 39.74 | ||||||
1971 | 19.52 | 22.69 | b | 27.57 | a | 37.14 | b | 45.20 | a | 55.86 | a | 63.15 | e | 62.63 | a | 44.96 | g | 39.29 | c | 25.47 | 18.84 | 37.94 | a | |||
1972 | 21.23 | 24.45 | 34.10 | b | 38.59 | a | 44.21 | c | 56.64 | b | 61.04 | e | 59.87 | a | 50.17 | 43.67 | a | 29.57 | b | ----- | z | 42.14 | a | |||
1973 | -1.03 | a | 18.33 | a | 28.67 | a | 30.97 | a | ----- | z | 48.14 | b | 60.03 | b | 59.70 | a | 48.38 | i | 36.04 | e | 27.10 | 17.74 | 32.57 | b | ||
1974 | 5.48 | 5.43 | 29.10 | a | 30.97 | a | 47.23 | 53.60 | 58.33 | a | 52.03 | 42.97 | 35.03 | b | 21.53 | 11.10 | a | 32.73 | ||||||||
1975 | 13.19 | 23.96 | 29.55 | 31.90 | a | 40.48 | d | 46.04 | b | 56.10 | 48.93 | a | 42.93 | b | 34.14 | b | 25.13 | 20.77 | 34.43 | |||||||
1976 | 13.10 | a | 29.76 | 26.90 | a | 39.25 | b | 44.89 | c | 52.50 | 61.77 | a | 57.33 | a | 50.76 | a | 31.39 | 20.83 | a | 8.23 | 36.39 | |||||
1977 | 9.77 | 15.15 | a | 21.19 | 33.14 | b | 39.84 | 51.52 | c | 55.30 | a | 57.68 | 53.21 | b | 37.93 | b | 29.13 | 26.67 | a | 35.88 | ||||||
1978 | 24.42 | 26.57 | 36.37 | a | 39.28 | a | 43.07 | a | 51.72 | a | 60.27 | a | 58.39 | 47.45 | a | 34.37 | a | 30.86 | a | 14.61 | 38.95 | |||||
1979 | 14.19 | 18.11 | 31.10 | a | 36.67 | c | ----- | z | 53.10 | 60.10 | 59.40 | a | 52.29 | b | 39.93 | d | 22.37 | 16.17 | a | 36.67 | a | |||||
1980 | 26.03 | 27.45 | 28.52 | 34.10 | 41.63 | a | 50.73 | 58.03 | 54.07 | a | 48.29 | b | 35.68 | 25.93 | a | 24.87 | a | 37.94 | ||||||||
1981 | 19.84 | 20.32 | 30.45 | 39.97 | a | 45.10 | a | 57.62 | a | 61.52 | 59.45 | 53.97 | a | 41.29 | 30.57 | 22.87 | 40.25 | |||||||||
1982 | 19.32 | 24.39 | 32.21 | b | 34.10 | 45.10 | b | 52.69 | a | 63.03 | a | 62.87 | 53.52 | a | 36.74 | 28.93 | 22.26 | 39.60 | ||||||||
1983 | 21.00 | a | 27.37 | a | 32.90 | 34.43 | 40.90 | a | 52.40 | 62.53 | a | 61.87 | a | 53.23 | 40.00 | 30.47 | 23.20 | a | 40.03 | |||||||
1984 | 9.00 | 18.62 | 26.87 | 31.70 | 45.57 | a | 53.03 | 62.72 | b | 63.43 | a | 54.39 | b | 39.87 | a | 29.50 | 24.55 | 38.27 | ||||||||
1985 | 22.29 | 21.29 | 33.90 | 41.83 | 51.63 | d | 57.82 | b | 65.12 | g | 61.97 | a | 51.43 | b | 41.71 | c | 31.96 | b | 22.48 | 39.85 | a | |||||
1986 | 22.83 | a | 31.36 | 37.13 | 41.35 | j | 46.93 | a | 60.00 | c | 60.96 | h | 63.84 | l | 52.86 | b | 38.30 | h | 31.86 | a | 21.14 | c | 38.01 | d | ||
1987 | 18.81 | 27.69 | b | 28.40 | f | 41.43 | 49.53 | a | 57.00 | b | 61.30 | h | 58.15 | k | 51.23 | d | 43.29 | j | 29.89 | b | 21.16 | 37.09 | d | |||
1988 | 12.81 | 21.86 | 29.73 | a | 39.71 | b | 47.67 | a | 61.62 | a | 63.52 | j | 62.77 | r | 50.88 | m | 46.55 | k | 33.15 | c | 19.14 | c | 33.21 | d | ||
1989 | 11.13 | 22.79 | 37.30 | a | 45.04 | c | 51.13 | h | 53.00 | m | 64.67 | m | 62.45 | k | 55.89 | u | ----- | z | 27.62 | i | 17.46 | e | 26.74 | g | ||
1990 | 22.76 | b | 27.59 | a | 39.26 | d | 46.18 | h | 49.59 | b | 61.86 | h | 65.36 | q | 64.58 | s | ----- | z | 39.93 | p | 31.42 | f | 14.12 | e | 30.66 | g |
1991 | 12.94 | 22.50 | 33.90 | a | 39.79 | b | 49.39 | c | 59.14 | i | 65.61 | m | 65.00 | n | 51.27 | s | 38.40 | u | 30.70 | c | 22.13 | 30.19 | e | |||
1992 | 15.19 | 28.83 | 38.10 | 47.60 | 53.13 | 56.82 | b | ----- | z | ----- | z | 60.62 | v | 45.29 | q | 28.07 | 19.03 | 35.85 | d | |||||||
1993 | 26.07 | a | 29.18 | 33.58 | 39.73 | 49.17 | a | 54.93 | 60.88 | g | 58.71 | j | 51.52 | g | 36.68 | l | 24.79 | b | 21.29 | 34.84 | d | |||||
1994 | 20.42 | 26.19 | a | 35.13 | a | 42.55 | a | 49.79 | b | 61.21 | b | 63.81 | j | 65.11 | l | 52.44 | l | 37.50 | m | 30.20 | 24.45 | 36.24 | d | |||
1995 | 26.39 | 31.29 | 37.00 | 39.42 | f | 45.50 | a | 51.45 | a | 61.63 | l | 61.83 | s | 45.00 | u | 35.38 | r | 30.14 | b | 23.94 | 35.10 | e | ||||
1996 | 22.17 | a | 28.45 | 33.23 | a | 38.87 | 49.76 | b | 58.52 | a | 62.79 | l | 62.94 | 49.47 | k | 34.19 | o | 31.36 | e | 25.81 | 39.01 | c | ||||
1997 | 26.35 | 26.33 | d | 32.87 | 35.73 | 47.97 | 58.70 | 62.29 | 62.32 | i | 55.52 | a | 40.64 | i | 29.11 | k | 19.73 | a | 40.61 | c | ||||||
1998 | 25.48 | 29.50 | 30.55 | 37.70 | 47.35 | 53.13 | 64.52 | b | 63.13 | 59.03 | 43.71 | c | 33.70 | 18.80 | a | 42.22 | ||||||||||
1999 | 24.87 | a | 28.79 | 37.35 | 39.10 | 47.10 | 56.33 | 63.93 | a | 58.97 | 48.80 | 36.42 | 28.73 | 19.74 | 40.84 | |||||||||||
2000 | 23.81 | 30.66 | 32.45 | 42.03 | 49.74 | 55.22 | c | 62.10 | 63.23 | 51.90 | 41.94 | 24.70 | 21.94 | 41.64 | ||||||||||||
2001 | 18.63 | a | 28.18 | 33.97 | 41.90 | 49.19 | 57.17 | 63.71 | 61.32 | 52.23 | 40.97 | 32.57 | 21.35 | 41.77 | ||||||||||||
2002 | 20.32 | 19.43 | 28.55 | 43.13 | 46.03 | 56.87 | 64.68 | 58.52 | 52.57 | 38.45 | 26.93 | 21.87 | 39.78 | |||||||||||||
2003 | 23.16 | 26.82 | 32.52 | 38.87 | 47.29 | 55.21 | a | 63.94 | 63.33 | a | 49.13 | 42.39 | 29.77 | 23.06 | 41.29 | |||||||||||
2004 | 16.55 | 23.41 | 33.58 | 40.63 | 48.19 | 54.13 | 61.00 | 58.58 | 51.17 | 42.68 | 30.07 | 21.65 | 40.14 | |||||||||||||
2005 | 29.48 | 28.39 | 30.55 | 37.72 | a | 45.81 | 52.87 | 58.84 | 59.10 | 51.70 | 41.81 | 30.50 | 19.81 | 40.55 | ||||||||||||
2006 | 22.84 | 21.61 | 31.84 | 39.33 | 47.10 | 55.70 | 62.90 | 59.16 | 47.00 | a | 39.94 | 29.33 | 20.48 | 39.77 | ||||||||||||
2007 | 16.55 | 26.43 | 32.32 | 39.70 | 47.06 | 53.50 | 63.35 | 61.87 | 52.30 | 38.29 | 28.55 | a | 22.13 | 40.17 | ||||||||||||
2008 | 16.48 | 23.28 | 27.97 | 34.13 | 42.32 | 51.93 | 62.71 | 59.26 | 49.13 | 37.94 | 28.38 | a | 20.63 | a | 37.85 | |||||||||||
2009 | 19.32 | 27.21 | 31.39 | 37.80 | 48.42 | 53.45 | a | 60.67 | a | 57.00 | 52.20 | 37.16 | 28.90 | 13.23 | a | 38.90 | ||||||||||
2010 | 15.52 | 22.82 | 30.52 | 37.93 | 43.81 | 55.70 | 62.48 | 58.67 | a | 49.90 | 41.42 | 27.97 | 27.84 | 39.55 | ||||||||||||
2011 | 15.80 | a | 20.29 | 31.90 | 36.86 | a | 42.10 | 53.40 | 60.19 | 60.42 | 50.87 | 37.84 | 27.87 | 17.97 | 37.96 | |||||||||||
2012 | 19.50 | a | 25.10 | 31.97 | 39.70 | 46.77 | a | 56.60 | 63.39 | 61.74 | 50.20 | 39.74 | 29.03 | 20.94 | 40.39 | |||||||||||
2013 | 7.06 | 19.93 | 31.43 | a | 36.13 | 46.74 | 55.77 | 63.84 | 59.06 | 53.50 | 35.97 | 29.40 | 13.81 | 37.72 | ||||||||||||
2014 | 17.84 | 26.64 | 30.55 | 37.63 | 46.03 | 53.33 | 62.32 | 58.03 | 53.10 | 40.65 | 27.40 | 26.42 | 40.00 | |||||||||||||
2015 | 21.71 | 26.57 | 33.10 | 36.93 | 46.68 | 57.00 | 59.84 | 59.58 | 53.07 | 44.81 | 28.37 | 19.26 | 40.58 | |||||||||||||
2016 | 20.23 | 23.34 | 31.19 | 38.07 | 44.77 | 56.90 | 61.45 | 59.00 | 51.10 | 44.16 | 32.70 | 22.84 | 40.48 | |||||||||||||
2017 | 23.52 | 32.57 | 34.90 | 38.23 | 44.84 | 57.03 | 64.23 | 59.13 | 52.17 | 36.42 | 31.59 | a | 19.16 | 41.15 | ||||||||||||
2018 | 21.00 | 26.54 | 30.19 | 41.30 | 48.58 | 57.40 | 65.03 | 62.00 | 54.53 | 42.76 | b | 26.10 | a | 23.87 | 41.61 | |||||||||||
2019 | 22.68 | 26.86 | 37.48 | 43.53 | 45.06 | 54.50 | 61.94 | 60.77 | 55.23 | 36.45 | 29.76 | a | 25.19 | 41.62 | ||||||||||||
2020 | 21.42 | 23.83 | 37.81 | 39.63 | 51.16 | 57.47 | 61.39 | 61.81 | 50.80 | 39.03 | 32.73 | 18.13 | 41.27 | |||||||||||||
2021 | 20.45 | 27.64 | 34.35 | 39.73 | 48.52 | 58.97 | 65.94 | 59.94 | 53.83 | 41.84 | 33.50 | 27.87 | 42.71 | |||||||||||||
2022 | 20.65 | 21.43 | 32.77 | 39.67 | 48.35 | 57.90 | 65.52 | 63.16 | 55.90 | 41.39 | 27.27 | 26.03 | a | 41.67 | ||||||||||||
2023 | 28.71 | 22.68 | 31.39 | 37.57 | 49.23 | 54.40 | 62.10 | 61.26 | 53.83 | 41.74 | 31.97 | 25.90 | 41.73 | |||||||||||||
2024 | 26.58 | 30.93 | 34.91 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.76 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.58 | 24.73 | 31.79 | 38.10 | 46.53 | 54.97 | 61.98 | 59.75 | 51.37 | 39.30 | 28.97 | 20.42 | 39.54 | |||||||||||||
S.D. | 6.10 | 4.58 | 3.43 | 3.24 | 2.74 | 2.93 | 2.18 | 2.84 | 2.98 | 2.90 | 2.84 | 4.16 | 2.04 | |||||||||||||
SKEW | -0.86 | -1.25 | -0.16 | 0.03 | -0.28 | -0.22 | -0.85 | -1.41 | -0.64 | -0.22 | -0.67 | -0.57 | -1.20 | |||||||||||||
MAX | 29.48 | 32.57 | 39.26 | 47.60 | 53.13 | 61.62 | 65.94 | 63.52 | 59.03 | 44.81 | 34.57 | 27.87 | 42.71 | |||||||||||||
MIN | -1.03 | 5.43 | 21.19 | 30.97 | 39.84 | 46.04 | 55.30 | 48.93 | 42.93 | 31.39 | 20.83 | 8.23 | 32.73 | |||||||||||||
YRS | 68 | 67 | 66 | 64 | 63 | 63 | 52 | 52 | 54 | 55 | 64 | 66 | 44 |