YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | 20.74 | 18.69 | 22.97 | 29.47 | 36.42 | 46.77 | 46.39 | 46.39 | 41.80 | 35.26 | 25.10 | 16.45 | 32.20 | |||||||||||||
1949 | 4.32 | 20.39 | 28.13 | 33.23 | 41.10 | 41.40 | 47.45 | 48.16 | 44.83 | 31.45 | 36.07 | 22.32 | 33.24 | |||||||||||||
1950 | 6.58 | 23.25 | 25.52 | 28.83 | 34.23 | 43.37 | 49.61 | 50.97 | 44.57 | 37.42 | 29.63 | 31.16 | 33.76 | |||||||||||||
1951 | 17.90 | 22.79 | 21.35 | 31.63 | 36.97 | 43.17 | 50.23 | 48.74 | 45.13 | 34.87 | 28.07 | 18.29 | 33.26 | |||||||||||||
1952 | 19.23 | 21.69 | 23.43 | a | 30.83 | 36.90 | 41.10 | 49.87 | 49.23 | 47.73 | 42.10 | 24.00 | 24.39 | 34.21 | ||||||||||||
1953 | 31.26 | 24.32 | 26.90 | 30.13 | 34.77 | a | 38.97 | 48.84 | 48.58 | 45.97 | 38.58 | 32.93 | 25.97 | 35.60 | ||||||||||||
1954 | 21.87 | 28.68 | 22.29 | 30.40 | 37.58 | 39.57 | 47.87 | 45.13 | 40.87 | 34.42 | 33.40 | 22.39 | 33.71 | |||||||||||||
1955 | 20.87 | 19.00 | 19.10 | 26.73 | 32.84 | 43.37 | 46.81 | 49.16 | 43.53 | 36.71 | 22.03 | 21.26 | 31.78 | |||||||||||||
1956 | 22.65 | 16.76 | 24.26 | 32.60 | 39.55 | 39.57 | 51.45 | 48.61 | 44.23 | 34.26 | 26.40 | 25.68 | 33.83 | |||||||||||||
1957 | 10.65 | 23.11 | 28.00 | 33.00 | 41.97 | 45.63 | 47.77 | 46.58 | 45.87 | 35.35 | 25.90 | 26.52 | 34.20 | |||||||||||||
1958 | 26.03 | 31.32 | 24.90 | 30.73 | 42.52 | 46.63 | 52.48 | 53.52 | 43.30 | 40.00 | 28.47 | 30.10 | 37.50 | |||||||||||||
1959 | 23.97 | 24.25 | 26.68 | 32.20 | 35.39 | 44.93 | 53.13 | 48.97 | 42.87 | 36.87 | 27.33 | 25.45 | 35.17 | |||||||||||||
1960 | 19.13 | 20.86 | 29.03 | 33.27 | 35.61 | 45.03 | 55.81 | 46.84 | 44.17 | 36.58 | 27.30 | 23.80 | a | 34.79 | ||||||||||||
1961 | 26.58 | 29.61 | 29.06 | 31.30 | 38.00 | 49.13 | 52.87 | 56.65 | 38.97 | 34.58 | 25.73 | 22.32 | 36.23 | |||||||||||||
1962 | 18.13 | 22.86 | 24.65 | 32.87 | 34.26 | 40.43 | 47.58 | 46.52 | 45.40 | 37.61 | 29.67 | 27.32 | 33.94 | |||||||||||||
1963 | 13.52 | 31.96 | 26.87 | 30.40 | 40.84 | 43.40 | 46.13 | 50.48 | 50.73 | 39.19 | 30.83 | 25.16 | 35.79 | |||||||||||||
1964 | 22.42 | 22.03 | 24.97 | 28.47 | 35.16 | 42.83 | 49.19 | 46.84 | 41.33 | 39.48 | 26.77 | 20.10 | 33.30 | |||||||||||||
1965 | 25.03 | 25.21 | 23.87 | 33.43 | 35.65 | 44.67 | 52.19 | 50.32 | 40.17 | 42.90 | 33.53 | 23.00 | 35.83 | |||||||||||||
1966 | 24.10 | 23.89 | 26.90 | 31.87 | 37.94 | 42.80 | 47.77 | 50.58 | 46.73 | 35.35 | 30.13 | 25.87 | 35.33 | |||||||||||||
1967 | 25.52 | 25.43 | 24.10 | 26.37 | 36.90 | 47.07 | 53.42 | 58.48 | 50.03 | 37.45 | 28.70 | 21.87 | 36.28 | |||||||||||||
1968 | 21.16 | 28.69 | 30.39 | 29.30 | 37.58 | 43.97 | 53.68 | 48.71 | 45.00 | 34.84 | 29.33 | 19.65 | 35.19 | |||||||||||||
1969 | 16.55 | 22.39 | 26.39 | 30.17 | 41.68 | 47.83 | 50.03 | 47.90 | 45.30 | 33.00 | 31.27 | 27.03 | 34.96 | |||||||||||||
1970 | 23.71 | 28.50 | 25.84 | 26.77 | 37.68 | 48.83 | 52.55 | 53.00 | 39.50 | 34.45 | 29.07 | 20.42 | 35.03 | |||||||||||||
1971 | 25.13 | 24.54 | 22.71 | 28.83 | 38.35 | 41.37 | 53.03 | 55.39 | 39.50 | 32.52 | 28.17 | 20.61 | 34.18 | |||||||||||||
1972 | 17.65 | 25.10 | 29.61 | 27.10 | 40.13 | 45.63 | 51.52 | 53.16 | 39.67 | 32.97 | 29.60 | 15.48 | 33.97 | |||||||||||||
1973 | 18.71 | 26.89 | 27.26 | 30.17 | 39.58 | 43.77 | 52.06 | 49.97 | 44.67 | 36.26 | 27.23 | 26.26 | 35.24 | |||||||||||||
1974 | 18.26 | 25.14 | 26.16 | 30.97 | 35.13 | 47.50 | 49.45 | 52.48 | 47.80 | 38.39 | 30.33 | 23.87 | 35.46 | |||||||||||||
1975 | 21.81 | 21.61 | 23.06 | 25.87 | 36.10 | 42.47 | 53.48 | 46.10 | 44.10 | 35.77 | 26.23 | 26.97 | 33.63 | |||||||||||||
1976 | 23.06 | o | ----- | 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 | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | 33.36 | f | 37.17 | 45.26 | 38.29 | 37.59 | a | 27.84 | 28.13 | 16.74 | 33.00 | e | ||||||
1999 | 22.50 | a | 19.58 | b | 18.10 | 22.17 | 30.81 | 37.80 | 36.55 | 41.55 | 28.37 | 26.84 | 31.80 | 21.16 | 28.10 | |||||||||||
2000 | 20.06 | 24.41 | 22.71 | c | 30.40 | 34.19 | 37.10 | 39.10 | 34.71 | 34.77 | 29.71 | 17.30 | 18.16 | 28.55 | ||||||||||||
2001 | 18.84 | 18.68 | 24.90 | 29.77 | 32.87 | 36.90 | 40.68 | 39.39 | 34.63 | 29.77 | 29.37 | 20.61 | 29.70 | |||||||||||||
2002 | 21.45 | 15.00 | 20.32 | 29.97 | 33.16 | 40.13 | 42.06 | 34.55 | 30.70 | 22.10 | 26.96 | b | 23.61 | 28.34 | ||||||||||||
2003 | 27.13 | 16.32 | 28.65 | 29.00 | 34.84 | 38.33 | 41.58 | 40.42 | 35.43 | 31.03 | 22.70 | 24.42 | 30.82 | |||||||||||||
2004 | 22.13 | 22.76 | 25.90 | 27.87 | 35.68 | 39.83 | 41.94 | 44.45 | 35.27 | 30.97 | 25.13 | 24.48 | 31.37 | |||||||||||||
2005 | 24.55 | 17.29 | 25.26 | 30.57 | 37.26 | 36.63 | 40.65 | 37.16 | 29.90 | 30.39 | 23.77 | 17.42 | 29.24 | |||||||||||||
2006 | 26.35 | 16.93 | a | 24.68 | 29.47 | 34.00 | 40.27 | 42.81 | 36.29 | 33.53 | 25.48 | 27.63 | 20.32 | 29.81 | ||||||||||||
2007 | 13.68 | 23.64 | 27.77 | 28.57 | 31.77 | 38.87 | 43.77 | 37.42 | 31.13 | 31.03 | 21.07 | 18.77 | 28.96 | |||||||||||||
2008 | 16.23 | 23.69 | 21.77 | 24.30 | 35.58 | 35.50 | 39.00 | 40.16 | 31.27 | 28.00 | 30.13 | 17.90 | 28.63 | |||||||||||||
2009 | 14.45 | 20.00 | 18.39 | 26.00 | 33.39 | 39.60 | 41.23 | 41.74 | 33.77 | 27.42 | 26.00 | 13.13 | 27.93 | |||||||||||||
2010 | 28.48 | 24.79 | 23.71 | 28.17 | 32.71 | 39.60 | 40.00 | 38.29 | 37.80 | 31.45 | 23.66 | a | 21.23 | 30.82 | ||||||||||||
2011 | 18.90 | 15.32 | 26.39 | 25.60 | 32.35 | 37.43 | 38.87 | 39.10 | 34.83 | 32.32 | 24.93 | 16.74 | 28.57 | |||||||||||||
2012 | 21.13 | 20.38 | 25.00 | 30.23 | 32.52 | 38.67 | 43.52 | 38.35 | 32.43 | 29.19 | 29.83 | 19.81 | 30.09 | |||||||||||||
2013 | 15.11 | c | 22.09 | e | 24.87 | 29.43 | 33.29 | 40.77 | 42.13 | 43.35 | 41.97 | 26.97 | 24.23 | 15.97 | a | 30.01 | ||||||||||
2014 | 23.29 | 21.64 | 27.00 | 29.07 | 33.45 | 38.97 | 46.55 | 43.32 | 36.80 | 35.94 | 23.63 | 25.48 | 32.10 | |||||||||||||
2015 | 24.55 | 27.82 | 27.03 | 27.50 | 36.65 | 42.83 | 44.26 | 40.65 | 33.33 | 33.39 | 22.90 | 21.13 | 31.84 | |||||||||||||
2016 | 23.45 | 27.79 | 29.71 | 32.57 | 35.90 | 39.40 | 42.23 | 38.87 | 34.97 | 36.45 | 33.90 | 13.45 | 32.39 | |||||||||||||
2017 | 10.42 | 23.82 | 29.39 | 31.20 | 34.77 | 41.37 | 42.61 | 41.94 | 37.20 | 29.35 | 28.77 | 15.26 | 30.51 | |||||||||||||
2018 | 27.29 | 18.93 | 23.68 | 29.90 | 39.10 | 40.43 | 42.52 | 41.16 | 30.87 | 29.42 | 27.03 | 21.45 | 30.98 | |||||||||||||
2019 | 22.39 | 16.50 | 16.71 | 31.17 | 36.10 | 38.77 | 42.13 | 43.94 | 38.80 | 26.16 | 23.53 | 25.32 | 30.13 | |||||||||||||
2020 | 25.84 | 17.93 | 23.77 | 27.77 | 36.77 | 42.37 | 42.77 | 42.13 | 37.77 | 30.19 | 26.10 | 23.61 | 31.42 | |||||||||||||
2021 | 26.03 | 21.00 | 23.10 | j | 27.47 | 33.39 | 43.07 | 45.29 | 42.61 | 35.53 | 31.74 | 29.47 | 19.97 | 32.32 | a | |||||||||||
2022 | 20.23 | 15.86 | 24.48 | 24.80 | 33.33 | a | 41.27 | 45.00 | 45.58 | 37.07 | 30.61 | 21.27 | 19.57 | a | 29.92 | |||||||||||
2023 | 18.10 | 17.82 | 19.48 | 25.90 | 36.87 | 39.80 | 42.23 | 45.81 | 37.17 | 32.81 | 28.13 | 27.77 | 30.99 | |||||||||||||
2024 | 21.94 | 24.31 | 17.44 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.12 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.70 | 22.47 | 24.89 | 29.35 | 36.07 | 41.74 | 46.43 | 45.35 | 39.57 | 33.24 | 27.42 | 21.91 | 32.48 | |||||||||||||
S.D. | 5.32 | 4.15 | 3.15 | 2.51 | 2.78 | 3.36 | 4.87 | 5.74 | 5.63 | 4.39 | 3.61 | 4.11 | 2.60 | |||||||||||||
SKEW | -0.91 | 0.18 | -0.56 | -0.53 | 0.47 | 0.38 | 0.03 | 0.09 | -0.05 | -0.11 | -0.15 | -0.08 | -0.12 | |||||||||||||
MAX | 31.26 | 31.96 | 30.39 | 33.43 | 42.52 | 49.13 | 55.81 | 58.48 | 50.73 | 42.90 | 36.07 | 31.16 | 37.50 | |||||||||||||
MIN | 4.32 | 15.00 | 16.71 | 22.17 | 30.81 | 35.50 | 36.55 | 34.55 | 28.37 | 22.10 | 17.30 | 13.13 | 27.93 | |||||||||||||
YRS | 54 | 54 | 52 | 53 | 53 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 52 |