YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 36.85 | r | 37.61 | g | 45.08 | f | 58.73 | d | 59.07 | b | 57.55 | i | 52.68 | k | 41.19 | d | 33.45 | j | 20.86 | c | 44.96 | h |
1961 | 20.04 | g | 28.21 | d | 30.57 | h | 37.40 | j | 48.77 | i | 55.31 | d | 57.54 | e | 57.29 | g | 48.40 | e | 37.95 | i | 29.63 | k | 24.73 | e | 42.84 | g |
1962 | 18.39 | c | 31.72 | j | 26.64 | c | 38.00 | c | 48.41 | d | 55.14 | a | 60.52 | f | 56.58 | l | 52.89 | l | 44.10 | k | 30.68 | h | 24.85 | e | 35.24 | f |
1963 | 17.03 | a | 30.08 | c | 30.15 | d | 39.93 | b | 48.92 | e | 54.96 | e | 61.37 | d | 59.26 | d | 54.38 | a | 43.96 | g | 31.40 | e | 18.74 | d | 40.57 | a |
1964 | 16.96 | h | 19.23 | c | 26.93 | d | 38.42 | f | 46.73 | e | 54.41 | c | 59.89 | c | 58.85 | d | 55.17 | a | 40.80 | k | 32.44 | e | 21.00 | i | 44.21 | d |
1965 | 25.00 | e | 22.56 | c | 26.07 | b | 40.38 | d | 47.90 | b | 54.80 | 60.13 | h | 56.43 | a | 51.81 | c | 38.15 | d | 34.72 | e | 26.70 | k | 39.78 | b | |
1966 | 17.26 | d | 21.92 | b | 32.42 | 40.22 | c | 49.23 | e | 58.71 | b | 64.03 | b | 58.44 | f | 50.95 | h | 38.96 | g | 33.00 | e | 20.04 | g | 39.60 | d | |
1967 | 24.15 | e | 26.92 | c | 35.10 | b | 45.67 | c | 44.93 | b | 56.64 | b | 61.50 | a | 56.81 | d | 51.00 | b | 41.63 | a | 31.12 | f | 22.38 | e | 42.43 | a |
1968 | 24.38 | b | 25.92 | e | 31.00 | d | 37.14 | b | 47.69 | b | 54.05 | i | 58.89 | c | 57.75 | c | 50.15 | d | 40.81 | d | 32.09 | h | 22.08 | f | 41.53 | c |
1969 | 32.25 | g | 27.21 | d | 24.04 | c | 40.85 | d | 47.55 | 56.59 | c | 63.21 | g | 62.03 | a | 54.73 | d | 40.77 | e | 29.11 | b | 26.91 | h | 42.54 | c | |
1970 | 22.59 | b | 29.48 | e | 28.31 | b | 37.00 | d | 47.26 | 54.00 | b | 62.31 | b | 61.59 | n | 52.77 | d | 39.14 | b | 31.06 | n | 24.89 | m | 41.43 | c | |
1971 | 23.61 | c | 23.96 | b | 31.55 | 36.36 | b | 46.74 | d | 56.42 | d | 61.72 | b | 57.25 | k | 53.20 | o | 40.69 | e | 32.68 | b | 27.60 | f | 39.30 | c | |
1972 | 22.76 | f | 27.79 | a | 34.20 | a | 45.46 | b | 45.67 | v | 56.45 | j | 59.95 | i | 58.19 | 54.19 | c | 44.34 | b | 28.14 | p | ----- | z | 44.03 | f | |
1973 | 25.19 | o | 26.92 | b | 31.07 | c | 31.39 | b | 46.12 | e | 52.59 | h | 60.92 | s | 56.79 | l | 49.23 | h | 41.17 | a | 29.42 | f | 21.67 | g | 35.33 | g |
1974 | 22.25 | c | 22.92 | d | 34.43 | x | 35.46 | f | 47.92 | g | 54.89 | b | 57.55 | b | 55.07 | c | 47.48 | a | 42.93 | a | 30.54 | b | 23.92 | e | 39.73 | c |
1975 | 24.84 | 25.04 | e | 30.37 | a | 35.57 | 41.57 | c | 54.00 | d | 57.00 | o | 55.77 | e | 48.77 | h | 38.72 | f | 28.74 | c | 23.25 | c | 35.46 | c | ||
1976 | 15.67 | v | ----- | z | 31.75 | k | 38.29 | b | 44.81 | 53.14 | a | 57.72 | f | 54.45 | k | 51.54 | d | 34.81 | d | 24.25 | f | 18.96 | f | 44.52 | g | |
1977 | 17.12 | g | 22.10 | h | 28.96 | c | 40.47 | 49.43 | a | 57.26 | c | 61.81 | d | 62.25 | o | 55.85 | j | 44.31 | o | 32.82 | b | 30.65 | e | 43.06 | e | |
1978 | 20.93 | b | 27.57 | u | ----- | z | 42.00 | w | 44.36 | i | 56.73 | 62.41 | b | 56.53 | p | 53.48 | g | 41.90 | 35.86 | i | 23.80 | a | 41.16 | g | ||
1979 | 9.12 | w | 15.40 | w | ----- | z | 39.33 | 46.63 | a | 52.52 | e | 57.35 | h | ----- | z | 51.36 | b | 41.76 | b | 26.64 | b | 21.05 | k | 43.04 | f | |
1980 | ----- | z | 28.62 | m | 30.21 | c | 33.92 | e | 44.33 | s | 59.52 | i | 64.04 | c | 60.47 | a | 55.44 | c | 40.62 | b | 30.22 | c | 31.86 | x | 44.99 | e |
1981 | ----- | z | ----- | z | 31.20 | p | 42.50 | l | ----- | z | ----- | z | ----- | z | 59.00 | g | 52.83 | a | 42.62 | e | 35.95 | i | 26.46 | e | 40.63 | i |
1982 | 23.40 | a | 24.25 | 33.27 | a | 38.07 | 46.17 | b | 55.19 | c | 61.42 | e | 61.58 | 54.52 | c | 40.74 | d | 29.04 | f | 25.44 | d | 42.19 | a | |||
1983 | 25.10 | b | 28.70 | a | 33.65 | 35.10 | 44.83 | a | 53.86 | a | 63.23 | 61.06 | 56.62 | a | 46.47 | a | 37.17 | a | 19.48 | b | 42.11 | |||||
1984 | 22.34 | b | 27.45 | 29.83 | g | 37.00 | c | 51.17 | a | 58.12 | d | 61.13 | a | 60.71 | 51.68 | b | 40.97 | 32.70 | c | 28.07 | b | 42.85 | a | |||
1985 | 21.93 | c | 23.36 | 33.59 | i | 41.86 | b | 50.36 | c | 58.27 | d | 60.23 | a | 60.15 | d | 51.75 | f | 45.39 | c | 35.28 | e | 22.17 | g | 44.09 | c | |
1986 | 28.61 | c | 29.04 | b | 35.26 | d | 41.89 | c | 48.14 | b | 56.92 | d | 60.00 | g | 59.58 | e | 53.73 | 42.60 | a | 27.96 | b | 24.23 | a | 40.72 | a | |
1987 | 19.00 | d | 28.21 | d | 27.42 | e | 36.48 | e | 47.23 | e | 56.50 | f | 60.11 | d | 60.14 | b | 52.48 | e | 43.31 | e | 28.52 | e | 21.58 | e | 38.59 | a |
1988 | 23.50 | e | 29.21 | a | 27.55 | k | 37.24 | i | 46.60 | f | 57.81 | d | 60.67 | d | 61.32 | c | 53.19 | c | 44.96 | f | 33.27 | h | 22.67 | g | 47.62 | f |
1989 | 25.36 | f | 23.13 | e | 33.85 | e | 41.00 | c | 52.59 | b | 55.71 | f | 62.12 | g | 61.33 | d | 51.41 | h | 44.86 | c | 30.61 | g | 21.39 | h | 42.79 | f |
1990 | 24.95 | k | 27.74 | e | 35.32 | 41.92 | f | 50.50 | i | 60.96 | c | 61.95 | l | 58.21 | g | 55.21 | f | 41.21 | g | 30.68 | h | 21.00 | d | 36.26 | h | |
1991 | 22.30 | d | 27.09 | e | 31.95 | i | 39.00 | d | 47.92 | e | 55.45 | h | 60.54 | e | 58.85 | e | 50.73 | d | 40.85 | e | 29.65 | g | 25.40 | a | 41.41 | c |
1992 | 22.48 | b | 28.78 | f | 31.31 | b | 41.38 | a | 48.37 | d | 51.14 | i | 59.76 | f | 58.65 | e | 51.22 | c | 41.75 | g | 28.93 | c | 23.70 | d | 38.26 | d |
1993 | 27.53 | a | 26.59 | a | 32.52 | 39.16 | e | 46.62 | e | 57.14 | b | 63.19 | e | 60.25 | c | 50.16 | e | 38.43 | j | 28.97 | a | 23.00 | b | 41.38 | a | |
1994 | 21.40 | a | 21.59 | a | 32.60 | f | 38.22 | c | 50.46 | e | 59.68 | b | 62.85 | e | 61.38 | e | 52.87 | 42.10 | a | 33.08 | d | 29.10 | a | 42.98 | a | |
1995 | 28.07 | a | 31.43 | 32.93 | c | 36.54 | b | 48.42 | 55.24 | a | 60.43 | h | 62.77 | a | 53.48 | c | 40.92 | g | 36.58 | f | 28.52 | b | 41.93 | c | ||
1996 | 23.08 | f | 29.09 | f | 28.00 | g | 36.27 | h | 55.27 | e | 59.50 | d | 62.88 | g | 59.18 | n | 50.48 | g | 41.00 | d | 28.52 | g | 25.64 | i | 51.92 | i |
1997 | 16.87 | h | 24.23 | f | 30.32 | f | 36.44 | e | 49.22 | h | 55.57 | g | 60.23 | e | 60.55 | i | 56.52 | g | 42.96 | d | 32.10 | i | 23.87 | h | 46.54 | i |
1998 | 27.76 | b | 28.81 | b | 27.64 | i | 34.84 | e | 50.05 | l | ----- | z | 62.52 | f | 60.39 | c | 55.32 | e | 45.20 | a | 35.17 | f | 26.29 | c | 39.80 | e |
1999 | ----- | z | 30.52 | e | 30.86 | i | 37.20 | e | 46.67 | a | 54.43 | b | ----- | z | 59.23 | r | 52.81 | i | 39.83 | b | 32.25 | f | 22.04 | f | 41.73 | g |
2000 | 24.43 | a | 24.96 | a | 30.56 | d | 41.89 | b | 50.76 | b | 58.26 | c | 61.43 | a | 60.52 | d | 53.30 | 43.86 | b | 26.74 | c | 20.89 | c | 41.47 | ||
2001 | 21.46 | c | 28.33 | a | 33.07 | c | 40.50 | d | ----- | z | ----- | z | 63.46 | g | 59.56 | f | 53.35 | g | 42.90 | 35.27 | 23.74 | 32.18 | e | |||
2002 | 25.33 | d | 24.21 | 27.70 | a | 43.24 | a | 48.54 | e | 59.96 | e | 62.17 | g | 60.96 | d | 54.07 | c | 42.19 | d | 33.22 | g | 27.43 | c | 41.36 | b | |
2003 | 25.23 | a | 26.75 | d | 33.17 | a | 37.46 | d | 49.14 | c | 55.87 | 62.77 | a | 60.82 | c | 52.71 | b | 45.79 | c | 35.90 | a | 25.48 | 42.59 | |||
2004 | 27.84 | 23.19 | b | 38.00 | b | 39.81 | c | 50.35 | 55.74 | c | 59.69 | b | ----- | z | 51.68 | b | 43.86 | i | 31.91 | g | 24.72 | f | 43.29 | d | ||
2005 | 30.21 | c | 31.60 | c | 31.80 | a | 36.96 | d | 48.36 | f | 57.17 | 61.42 | e | 59.50 | g | 52.54 | b | 40.35 | 29.82 | b | 24.93 | a | 39.68 | b | ||
2006 | 26.23 | a | 23.70 | a | 33.27 | a | 42.85 | c | 52.16 | 59.93 | b | 63.77 | 62.24 | b | 50.13 | 41.71 | 32.27 | 24.13 | a | 42.70 | ||||||
2007 | 19.29 | 28.19 | a | 35.29 | 36.45 | a | 47.42 | g | 54.47 | 59.00 | 61.03 | 54.77 | 43.73 | a | 31.38 | a | 23.71 | 40.66 | a | |||||||
2008 | 18.42 | 26.38 | 31.55 | 39.20 | 48.10 | 58.47 | 61.13 | 58.00 | 50.97 | 40.76 | b | 29.90 | 20.23 | e | 40.26 | |||||||||||
2009 | ----- | z | 25.50 | 32.34 | b | 38.52 | a | 49.07 | d | 58.77 | 61.55 | 57.81 | 49.57 | 37.16 | 28.57 | 20.58 | 41.77 | a | ||||||||
2010 | 20.29 | 22.50 | 30.90 | b | 37.60 | 44.29 | 58.27 | 60.53 | a | 58.58 | 54.03 | ----- | z | 26.96 | f | 27.32 | 41.43 | b | ||||||||
2011 | 19.13 | 19.46 | 32.03 | 39.67 | 46.68 | 60.52 | c | 64.55 | 64.23 | 52.90 | 40.87 | 30.77 | 21.71 | 41.04 | ||||||||||||
2012 | 26.97 | 24.18 | a | 33.97 | a | 41.33 | 51.19 | 60.00 | 62.94 | 61.03 | 52.55 | a | 40.94 | ----- | z | ----- | z | 45.51 | b | |||||||
2013 | 22.19 | d | ----- | z | ----- | z | 36.20 | 47.29 | ----- | z | 61.39 | 59.84 | 55.10 | 38.32 | 29.93 | 24.39 | 41.63 | c | ||||||||
2014 | 19.10 | ----- | z | 27.65 | 35.67 | 46.77 | 57.53 | 61.26 | d | ----- | z | 57.10 | 45.19 | ----- | z | 24.18 | c | 41.61 | c | |||||||
2015 | 24.97 | 27.36 | 33.71 | 39.23 | 46.97 | 58.63 | 62.06 | 61.52 | 56.63 | 46.87 | 30.70 | 26.94 | 42.97 | |||||||||||||
2016 | 25.81 | 28.79 | 33.17 | b | 38.90 | 46.03 | 58.10 | 64.60 | a | 59.81 | 55.70 | 48.55 | 37.33 | 26.97 | 43.65 | |||||||||||
2017 | 27.32 | 34.39 | 36.81 | 41.18 | b | 46.87 | 58.73 | 62.45 | 59.61 | 54.63 | 52.67 | v | 33.81 | i | 30.80 | u | 46.89 | c | ||||||||
2018 | 24.50 | o | 25.96 | 34.94 | 38.67 | 53.55 | 63.00 | f | 63.48 | 61.94 | 57.03 | 45.38 | b | 31.43 | 25.32 | 43.77 | b | |||||||||
2019 | 26.68 | 27.64 | q | 33.95 | k | 42.07 | 47.06 | 57.37 | 63.33 | a | 64.39 | 59.70 | 39.94 | 31.40 | 27.48 | 45.94 | b | |||||||||
2020 | 27.94 | 26.17 | 37.84 | 40.40 | 52.35 | 60.73 | 64.87 | 63.26 | 51.17 | 41.20 | a | 36.97 | a | 26.29 | 44.10 | |||||||||||
2021 | 24.35 | 23.57 | 32.55 | 40.60 | 51.10 | 61.63 | 62.52 | 60.45 | 55.47 | 43.06 | 35.30 | 32.39 | 43.58 | |||||||||||||
2022 | 21.55 | 20.00 | 29.16 | 41.33 | 51.68 | 62.03 | 64.97 | 62.35 | 55.13 | 44.65 | 28.10 | 25.58 | 42.21 | |||||||||||||
2023 | 25.26 | 25.29 | 32.03 | 35.97 | 49.65 | ----- | z | 64.20 | f | 61.74 | 56.03 | 41.90 | 32.27 | 27.23 | 38.74 | b | ||||||||||
2024 | 22.10 | 28.34 | 32.65 | 34.20 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.70 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.53 | 26.16 | 31.84 | 38.91 | 48.35 | 57.22 | 61.72 | 60.20 | 53.27 | 42.13 | 31.59 | 24.71 | 42.42 | |||||||||||||
S.D. | 3.25 | 3.19 | 3.05 | 2.76 | 2.58 | 2.35 | 1.84 | 2.05 | 2.43 | 2.57 | 2.91 | 2.95 | 1.17 | |||||||||||||
SKEW | -0.13 | -0.06 | -0.35 | 0.04 | 0.27 | 0.04 | -0.26 | -0.40 | 0.02 | -0.03 | 0.36 | 0.18 | -0.36 | |||||||||||||
MAX | 30.21 | 34.39 | 38.00 | 45.67 | 55.27 | 62.03 | 64.97 | 64.39 | 59.70 | 48.55 | 37.33 | 32.39 | 44.10 | |||||||||||||
MIN | 17.03 | 19.23 | 24.04 | 31.39 | 41.57 | 52.52 | 57.54 | 55.07 | 47.48 | 34.81 | 26.64 | 18.74 | 40.26 | |||||||||||||
YRS | 47 | 51 | 47 | 55 | 50 | 49 | 44 | 44 | 49 | 49 | 37 | 43 | 11 |