YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.58 | f | ----- | z |
1989 | 19.57 | c | 19.83 | e | 36.66 | c | 38.78 | c | 48.14 | c | 51.83 | 59.16 | 56.45 | a | ----- | z | 39.48 | b | 30.71 | b | 18.29 | b | 38.08 | a | ||
1990 | 23.67 | b | 22.54 | a | 31.85 | e | 38.47 | 41.88 | a | 56.13 | 56.40 | 55.21 | 52.09 | b | 42.13 | 32.27 | d | 18.91 | b | 39.30 | ||||||
1991 | 19.48 | d | 27.38 | 30.07 | b | 36.69 | c | 47.23 | 55.09 | a | 57.63 | 57.15 | 50.02 | a | 41.05 | 27.08 | e | 21.18 | c | 39.17 | ||||||
1992 | 20.71 | b | 24.17 | 30.47 | b | 41.86 | b | 48.32 | 52.70 | 56.98 | e | 55.78 | b | 50.27 | b | 43.30 | a | 23.61 | c | 19.66 | c | 38.99 | ||||
1993 | 20.59 | c | 21.70 | 31.21 | 45.89 | b | 46.11 | 54.07 | b | 59.52 | 57.10 | b | 50.63 | g | 39.98 | b | 27.09 | c | 20.87 | d | 38.56 | a | ||||
1994 | 21.76 | b | 22.15 | b | 31.80 | a | 36.56 | f | 47.82 | a | 58.38 | b | 59.34 | 59.50 | 51.15 | d | 40.72 | a | 29.38 | d | 25.19 | d | 40.65 | a | ||
1995 | 22.62 | c | 28.62 | b | 31.62 | e | 35.75 | b | 42.03 | b | 52.33 | a | 57.25 | e | 60.77 | a | 50.36 | b | 41.07 | b | 33.29 | i | 29.35 | k | 42.24 | b |
1996 | 23.23 | e | 27.96 | a | 29.24 | 38.69 | a | 50.82 | c | 55.23 | 60.59 | b | 58.02 | d | 49.07 | a | 41.44 | 32.89 | b | 23.98 | a | 40.93 | ||||
1997 | 21.62 | b | 23.45 | 33.45 | 33.19 | a | 45.89 | c | 54.98 | b | 59.08 | 58.44 | 54.50 | c | 41.13 | d | 25.18 | e | 19.53 | b | 39.20 | |||||
1998 | 21.79 | b | 20.69 | b | 29.41 | b | 34.83 | 47.38 | a | 53.74 | c | 61.19 | 58.44 | d | 54.89 | b | 41.50 | a | 34.94 | d | 23.03 | a | 40.16 | |||
1999 | 24.94 | e | 29.62 | 35.17 | a | 33.79 | b | 44.62 | a | 53.13 | 60.72 | b | 58.39 | 50.17 | a | 42.24 | 36.41 | a | 21.63 | e | 40.90 | |||||
2000 | 24.05 | b | 30.16 | 31.64 | b | 42.77 | 52.60 | 58.36 | a | 62.60 | 61.76 | 54.17 | a | 41.63 | 20.84 | e | 19.24 | d | 41.65 | |||||||
2001 | 18.05 | a | 23.20 | a | 29.11 | 40.14 | b | 45.75 | c | 55.43 | b | 58.54 | c | 54.53 | 52.37 | c | 42.04 | c | 30.73 | d | 22.90 | b | 39.40 | |||
2002 | 23.61 | d | 21.41 | 28.56 | 40.72 | c | 46.17 | d | 58.50 | e | 61.21 | c | 58.58 | a | 51.20 | c | 37.32 | a | 28.75 | b | 22.28 | b | 39.86 | |||
2003 | 28.88 | b | 20.57 | a | 30.20 | c | 39.95 | 47.03 | 52.52 | a | 61.64 | c | 58.83 | d | 49.93 | 44.71 | 30.36 | e | 24.36 | b | 40.75 | |||||
2004 | 22.34 | c | 19.24 | 36.03 | 38.98 | b | 47.66 | 53.67 | d | 57.94 | d | 55.60 | b | 49.48 | e | 41.60 | a | 27.66 | h | 23.12 | e | 40.52 | a | |||
2005 | 26.17 | b | 25.25 | 29.47 | 38.96 | c | 48.38 | e | 55.17 | d | 61.94 | 56.87 | a | 52.81 | c | 42.18 | 32.61 | c | 19.07 | c | 40.74 | |||||
2006 | 23.28 | d | 22.86 | c | 29.52 | 41.77 | 47.98 | b | 57.45 | b | 61.72 | f | 58.10 | b | 46.72 | 39.76 | b | 31.21 | a | 22.69 | g | 39.86 | b | |||
2007 | 14.77 | c | 25.26 | a | 33.16 | b | 37.20 | c | 46.50 | c | 55.64 | a | 61.05 | 60.43 | b | 52.11 | h | 43.14 | b | 34.22 | c | 17.95 | b | 39.03 | a | |
2008 | 15.36 | b | 22.38 | 27.38 | b | 34.12 | e | 45.15 | a | 54.30 | 60.73 | 57.85 | 50.60 | 41.07 | a | 32.21 | a | 21.74 | 38.57 | |||||||
2009 | 23.29 | 24.98 | 32.37 | 36.35 | 48.60 | 52.88 | 59.21 | 57.03 | 49.82 | 36.50 | 31.35 | 14.74 | d | 38.93 | ||||||||||||
2010 | 20.34 | 16.63 | a | 28.92 | 39.03 | 45.58 | 56.95 | a | 61.00 | b | 59.31 | 52.98 | 41.76 | 28.66 | a | 27.73 | c | 39.91 | ||||||||
2011 | 21.34 | b | 19.96 | a | 34.11 | 38.83 | 44.70 | a | 57.43 | b | 62.36 | c | 60.83 | a | 50.75 | 40.40 | b | 29.53 | 19.58 | m | 41.84 | a | ||||
2012 | 25.05 | a | 21.98 | 35.37 | 42.13 | 48.56 | 60.12 | 62.85 | 59.85 | 51.50 | 41.17 | a | 33.20 | 19.85 | a | 41.80 | ||||||||||
2013 | 17.19 | 20.05 | 29.66 | 34.33 | 44.47 | 57.40 | 60.68 | a | 59.53 | 54.90 | a | 38.65 | 29.43 | 18.61 | 38.74 | |||||||||||
2014 | 20.34 | 24.05 | 31.17 | a | 37.21 | a | 45.05 | 55.23 | 60.32 | 56.92 | 53.37 | 43.12 | a | 29.63 | 21.31 | 39.81 | ||||||||||
2015 | 24.32 | 26.55 | 35.27 | a | 38.62 | 44.11 | 58.12 | a | 58.91 | b | 59.66 | 54.45 | 46.03 | 28.70 | 19.60 | 41.20 | ||||||||||
2016 | 19.92 | a | 27.75 | a | 32.66 | 37.55 | 44.76 | 58.45 | 61.62 | a | 56.74 | 52.58 | 44.90 | g | 32.00 | a | 24.35 | 40.76 | a | |||||||
2017 | 20.29 | 30.05 | 37.60 | 38.05 | 44.77 | 57.97 | a | 60.71 | 56.97 | 52.72 | 41.98 | 37.82 | 27.19 | 42.18 | ||||||||||||
2018 | 25.55 | 26.07 | 33.29 | 39.53 | 50.27 | 59.68 | 62.50 | 59.05 | 54.27 | 40.61 | 27.20 | 21.32 | 41.61 | |||||||||||||
2019 | 20.35 | 23.11 | 30.94 | 40.35 | 41.92 | 53.33 | 61.18 | 60.69 | 55.92 | 34.18 | 29.67 | 20.53 | 39.35 | |||||||||||||
2020 | 21.50 | 19.78 | 33.32 | 36.87 | 50.34 | 56.62 | 61.24 | 60.63 | 51.33 | 42.03 | a | 32.78 | 19.13 | 40.46 | ||||||||||||
2021 | 22.77 | 23.79 | 29.32 | 37.78 | 46.97 | 57.70 | 61.45 | 59.71 | 54.95 | 42.10 | 35.13 | 28.48 | 41.68 | |||||||||||||
2022 | 24.03 | 18.05 | 30.52 | a | 39.58 | 47.80 | a | 57.48 | 62.73 | 59.27 | 54.50 | 39.85 | 27.08 | 23.00 | 40.33 | |||||||||||
2023 | 20.03 | 21.88 | 27.98 | 36.22 | 47.40 | 53.42 | 62.39 | 60.21 | 52.00 | 40.68 | a | 31.00 | 24.31 | 39.79 | ||||||||||||
2024 | 20.89 | 25.26 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.07 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.77 | 23.57 | 31.67 | 38.38 | 46.65 | 55.76 | 60.37 | 58.41 | 52.06 | 41.07 | 30.42 | 21.66 | 40.21 | |||||||||||||
S.D. | 2.88 | 3.43 | 2.60 | 2.77 | 2.44 | 2.30 | 1.76 | 1.79 | 2.16 | 2.18 | 3.56 | 3.05 | 1.06 | |||||||||||||
SKEW | -0.21 | 0.23 | 0.53 | 0.29 | 0.08 | 0.04 | -0.60 | -0.24 | -0.18 | -0.88 | -0.38 | 0.33 | 0.24 | |||||||||||||
MAX | 28.88 | 30.16 | 37.60 | 45.89 | 52.60 | 60.12 | 62.85 | 61.76 | 55.92 | 46.03 | 37.82 | 28.48 | 42.18 | |||||||||||||
MIN | 14.77 | 16.63 | 27.38 | 33.19 | 41.88 | 51.83 | 56.40 | 54.53 | 46.72 | 34.18 | 20.84 | 14.74 | 38.57 | |||||||||||||
YRS | 36 | 36 | 35 | 34 | 35 | 35 | 34 | 35 | 32 | 34 | 33 | 32 | 26 |