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 | 46.47 | 59.58 | 57.90 | 51.03 | 39.97 | 28.37 | 22.10 | 43.63 | e | |||||||
1952 | 25.06 | 20.10 | 21.13 | 35.13 | 43.77 | 51.27 | 56.90 | 57.32 | 51.43 | 40.94 | 25.13 | 19.32 | 37.29 | |||||||||||||
1953 | 21.16 | 16.68 | 28.00 | 33.97 | 36.06 | 50.70 | 60.23 | 56.55 | 51.17 | 39.03 | 29.67 | 14.81 | 36.50 | |||||||||||||
1954 | 20.55 | 25.11 | 27.19 | 38.03 | 42.81 | 49.63 | 60.20 | f | 54.77 | 52.97 | 41.87 | 28.63 | 20.35 | 36.54 | a | |||||||||||
1955 | 18.39 | 17.00 | b | 24.84 | 30.63 | 41.35 | 48.50 | 57.00 | 57.22 | h | 49.77 | 41.03 | 26.57 | 24.23 | 34.48 | a | ||||||||||
1956 | 24.16 | 15.75 | a | 24.97 | 33.03 | a | 42.65 | 54.33 | 56.52 | 53.32 | 51.50 | 39.94 | 20.07 | a | 17.03 | a | 36.11 | |||||||||
1957 | 25.53 | a | 32.70 | a | 28.65 | 32.24 | a | 40.40 | a | 51.33 | 59.94 | 57.26 | 48.17 | 40.65 | 25.70 | 22.50 | a | 38.76 | ||||||||
1958 | 17.90 | a | 27.57 | 27.20 | a | 33.43 | b | 46.81 | 54.77 | 57.97 | 57.94 | 53.20 | 42.90 | 27.38 | a | 21.93 | a | 39.08 | ||||||||
1959 | 21.26 | 21.52 | a | 24.97 | b | 38.23 | 40.26 | 54.13 | 58.39 | 57.32 | 46.83 | 38.35 | 27.23 | 24.67 | a | 37.76 | ||||||||||
1960 | 15.32 | 19.67 | b | 31.48 | 35.17 | 41.52 | 53.43 | 57.55 | 56.87 | 52.07 | 38.81 | 29.79 | a | 18.33 | a | 37.50 | ||||||||||
1961 | 22.27 | a | 23.46 | 28.23 | 33.73 | 39.74 | 52.93 | 57.52 | 56.52 | 47.80 | 37.73 | a | 27.59 | a | 19.80 | a | 37.28 | |||||||||
1962 | 19.45 | 26.59 | a | 23.84 | 37.13 | 39.26 | 48.07 | 56.16 | 56.68 | 52.40 | 40.35 | 31.47 | 24.53 | a | 37.99 | |||||||||||
1963 | 14.80 | a | 25.33 | a | 26.10 | 31.73 | 42.97 | 44.97 | 57.35 | 56.48 | 53.50 | 43.10 | 30.03 | a | 18.32 | 37.06 | ||||||||||
1964 | 13.58 | 15.14 | 22.42 | 31.25 | b | 40.19 | 49.07 | 58.81 | 55.71 | 49.23 | 40.74 | 25.37 | 20.74 | 35.19 | ||||||||||||
1965 | 23.42 | 18.61 | 25.60 | a | 32.63 | 37.17 | a | 45.30 | 56.29 | 54.94 | 46.21 | a | 37.68 | 30.72 | a | 21.41 | b | 35.83 | ||||||||
1966 | 15.97 | a | 13.88 | d | 26.33 | a | 33.87 | 43.00 | a | 50.43 | 58.45 | 55.77 | 50.37 | 35.94 | 30.38 | a | 19.39 | 36.15 | ||||||||
1967 | 15.00 | 21.18 | 27.94 | 29.80 | 37.39 | 45.90 | 56.00 | 53.81 | 49.50 | 37.16 | 29.03 | 17.81 | 35.04 | |||||||||||||
1968 | 20.48 | 29.21 | 29.16 | ----- | z | 39.68 | 48.30 | 54.45 | 51.45 | 45.70 | 37.00 | 26.67 | 18.06 | 36.38 | a | |||||||||||
1969 | 25.23 | 24.21 | 23.42 | 33.10 | 42.26 | 47.37 | 56.94 | 57.84 | 50.63 | 33.68 | 26.93 | 25.35 | 37.25 | |||||||||||||
1970 | 17.58 | 25.39 | 24.42 | 26.93 | 38.97 | 49.33 | 56.58 | 55.68 | 47.80 | 32.68 | 25.77 | 22.42 | 35.30 | |||||||||||||
1971 | 15.94 | 20.68 | 24.03 | 30.83 | 36.39 | 48.13 | 57.23 | 54.29 | 49.10 | 36.00 | 28.50 | 21.35 | 35.21 | |||||||||||||
1972 | 19.19 | 22.03 | 30.26 | 30.60 | 39.87 | 50.30 | 56.90 | 54.16 | 49.57 | 43.10 | 25.47 | 22.19 | 36.97 | |||||||||||||
1973 | 20.42 | 26.75 | 26.87 | 30.63 | 43.06 | 49.43 | 56.06 | 54.68 | 47.20 | 39.10 | 28.10 | 19.84 | 36.85 | |||||||||||||
1974 | 25.06 | 19.32 | 29.45 | 32.37 | 41.03 | 53.70 | 56.68 | 54.23 | 48.87 | 43.52 | 28.83 | 20.10 | 37.76 | |||||||||||||
1975 | 20.74 | 23.14 | 27.32 | 28.13 | 37.13 | 47.37 | 56.90 | 55.00 | 49.67 | 38.10 | 24.30 | 23.55 | 35.95 | |||||||||||||
1976 | 19.23 | 28.69 | 26.03 | 32.43 | 42.23 | 49.60 | 56.90 | 55.39 | 50.03 | 36.87 | 26.90 | 20.19 | 37.04 | |||||||||||||
1977 | 23.81 | 24.54 | 23.26 | 34.63 | ----- | z | 51.30 | 58.00 | 57.29 | 51.07 | 42.77 | 29.00 | 25.94 | 38.33 | a | |||||||||||
1978 | 26.45 | 27.18 | 34.06 | 32.90 | 40.42 | 49.20 | 57.84 | 54.52 | 49.13 | 42.32 | 32.73 | 21.58 | 39.03 | |||||||||||||
1979 | 21.45 | 23.43 | 28.71 | 33.53 | 41.52 | 51.10 | 54.77 | 52.42 | 52.10 | 40.71 | 23.30 | 22.06 | 37.09 | |||||||||||||
1980 | 26.68 | 27.10 | 26.65 | 31.57 | 37.00 | a | 48.97 | 56.34 | b | 52.26 | 47.50 | 35.10 | 23.97 | 22.40 | a | 36.29 | ||||||||||
1981 | 24.45 | 21.75 | 25.94 | 34.73 | 38.84 | 50.23 | 57.00 | 55.29 | 49.43 | 36.19 | 26.57 | 21.00 | a | 36.79 | ||||||||||||
1982 | 18.48 | b | 25.27 | b | 26.61 | c | 30.55 | a | 39.41 | b | 45.59 | a | 54.74 | 56.48 | 51.07 | a | 33.90 | a | 28.40 | 21.10 | b | 35.97 | ||||
1983 | 21.39 | 25.65 | b | 28.65 | 28.97 | a | 38.20 | a | 46.32 | b | 55.52 | b | 56.55 | 53.03 | 41.18 | c | 28.86 | a | 24.15 | d | 37.37 | |||||
1984 | 21.84 | 18.55 | 23.16 | 29.93 | a | 42.20 | a | 50.67 | 56.13 | 55.87 | a | 49.74 | c | 36.47 | a | 27.00 | 24.53 | a | 36.34 | |||||||
1985 | 22.73 | a | 19.25 | 28.03 | a | 35.41 | a | 42.93 | c | 50.47 | 57.06 | 55.61 | 46.07 | a | 39.73 | a | 27.30 | 19.06 | 36.97 | |||||||
1986 | 21.61 | 24.37 | a | 30.94 | 33.17 | a | 40.40 | a | 51.25 | b | 54.73 | a | 56.77 | 45.07 | b | 36.13 | a | 28.80 | 23.84 | 37.26 | ||||||
1987 | 18.23 | e | 24.15 | b | 25.05 | i | 34.65 | g | 40.72 | b | 50.56 | c | 52.47 | a | 54.66 | b | 46.26 | c | 43.59 | b | 26.21 | b | 18.33 | g | 39.65 | c |
1988 | 19.19 | j | 25.95 | j | 23.67 | d | 32.68 | e | 40.63 | d | 52.76 | a | 56.90 | b | 57.19 | d | 44.68 | b | 37.43 | a | 25.97 | 21.55 | b | 39.34 | b | |
1989 | 19.33 | g | 25.05 | f | 28.14 | c | 34.60 | e | 39.58 | 47.31 | a | 55.72 | b | 54.61 | 48.57 | 38.55 | 25.67 | 15.93 | a | 38.87 | b | |||||
1990 | 15.14 | b | 19.65 | e | 28.11 | d | 33.97 | a | 38.00 | 52.52 | a | 56.00 | 52.32 | 52.13 | 36.97 | 28.83 | 17.37 | a | 35.92 | |||||||
1991 | 20.90 | 25.04 | 23.63 | a | 29.33 | 37.23 | a | 47.30 | 55.61 | 56.13 | 49.17 | a | 39.53 | a | 26.28 | a | 25.00 | b | 36.26 | |||||||
1992 | 15.60 | a | 27.65 | c | 30.20 | a | 35.66 | a | 44.87 | 47.40 | 54.84 | 54.84 | 48.97 | 39.29 | 19.33 | 19.80 | a | 36.54 | ||||||||
1993 | 27.68 | c | 26.18 | 28.74 | 31.97 | 43.42 | 48.33 | c | 52.67 | a | 56.42 | 47.07 | a | 30.52 | 23.41 | c | 18.83 | b | 36.27 | |||||||
1994 | 18.06 | 22.04 | 29.28 | b | 33.70 | 40.50 | a | 52.24 | a | 55.39 | 57.71 | 51.14 | b | 36.65 | 25.66 | a | 24.03 | 37.20 | ||||||||
1995 | 23.62 | b | 27.79 | 29.43 | a | 29.30 | 37.07 | a | 47.27 | 53.97 | 58.80 | a | 50.20 | 37.16 | 30.31 | a | 21.10 | 37.17 | ||||||||
1996 | 20.48 | 27.93 | 24.90 | 30.93 | a | 41.35 | 53.17 | 57.55 | 55.81 | 46.38 | a | 37.26 | 26.87 | 18.52 | 36.76 | |||||||||||
1997 | 18.13 | 21.33 | a | 25.32 | 30.10 | a | 42.94 | 47.46 | b | 54.74 | 55.62 | b | 54.07 | 33.03 | 26.18 | b | 18.37 | a | 35.61 | |||||||
1998 | 21.42 | 22.96 | ----- | z | 30.13 | 37.74 | 43.37 | 57.11 | c | 55.69 | b | 51.38 | a | 37.27 | a | 27.79 | a | 19.50 | a | 36.76 | a | |||||
1999 | 18.10 | b | 20.35 | b | 26.90 | 29.57 | 39.80 | a | ----- | z | 58.23 | 57.32 | 50.60 | 47.57 | c | 31.55 | h | 17.36 | f | 38.72 | c | |||||
2000 | 21.80 | f | 25.62 | e | 26.86 | c | 34.43 | b | 44.17 | a | 52.80 | 57.27 | a | 55.96 | e | 50.96 | g | 40.04 | c | 24.08 | f | 21.68 | i | 42.14 | d | |
2001 | 19.86 | i | 22.90 | g | 27.56 | d | 34.90 | i | 40.81 | d | 48.88 | f | 56.56 | d | 55.13 | a | 48.79 | a | 39.13 | 29.55 | a | 14.19 | d | 38.96 | d | |
2002 | 19.33 | m | 18.62 | g | 21.65 | h | 36.62 | a | 38.62 | b | 51.28 | a | 57.55 | 52.81 | 48.90 | 37.59 | b | 28.81 | d | 21.15 | e | 41.48 | c | |||
2003 | 27.07 | d | 25.67 | j | 26.62 | g | 30.46 | f | 40.38 | b | 48.62 | a | 58.38 | b | 57.26 | 50.73 | 43.52 | b | 27.82 | h | 22.86 | i | 46.57 | e | ||
2004 | 25.05 | j | 20.05 | g | 34.96 | g | 33.54 | d | 40.83 | a | 48.27 | 53.59 | b | 52.82 | c | 47.86 | b | 38.00 | c | 28.81 | i | 22.73 | i | 44.99 | e | |
2005 | 26.09 | h | 31.44 | j | 28.45 | i | 33.67 | c | 41.97 | b | 49.07 | 56.61 | 55.50 | k | 50.67 | x | 39.05 | l | 28.58 | k | 20.38 | o | 45.33 | h | ||
2006 | 21.18 | n | 23.50 | j | 26.87 | h | 34.48 | e | ----- | z | 52.80 | 58.42 | 54.28 | b | 47.26 | c | 38.00 | f | 29.59 | c | 19.57 | h | 46.14 | f | ||
2007 | 18.76 | n | 22.65 | k | 29.76 | f | ----- | z | 43.10 | a | ----- | z | ----- | z | ----- | z | 50.73 | 37.04 | d | 33.67 | i | 22.21 | l | 43.62 | i | |
2008 | 19.48 | j | 25.29 | o | ----- | z | 31.07 | a | 38.10 | 49.24 | a | 56.81 | 55.68 | 49.87 | 38.14 | c | 29.39 | g | 25.17 | b | 43.01 | d | ||||
2009 | ----- | z | 24.71 | g | 29.10 | b | 32.00 | 44.03 | 48.66 | a | 57.97 | 54.23 | a | ----- | z | 35.19 | ----- | z | ----- | z | 43.03 | e | ||||
2010 | 22.65 | 23.00 | 26.81 | e | 33.14 | a | 37.83 | a | ----- | z | 57.55 | 58.15 | d | 51.72 | e | 40.65 | 23.47 | 25.62 | b | 36.42 | a | |||||
2011 | 16.19 | 18.79 | 27.16 | 33.30 | 36.29 | 48.60 | 58.19 | ----- | z | 50.57 | ----- | z | 26.87 | 18.69 | b | 33.46 | b | |||||||||
2012 | 21.77 | a | 20.97 | 23.42 | 33.59 | a | 39.11 | d | ----- | z | 57.65 | 56.42 | ----- | z | 36.26 | ----- | z | ----- | z | 36.15 | d | |||||
2013 | 18.32 | 16.45 | f | 28.06 | 30.17 | 37.52 | ----- | z | 48.00 | g | 56.26 | 48.43 | 33.13 | 28.70 | 19.52 | 33.35 | c | |||||||||
2014 | 19.39 | 24.43 | 28.57 | a | 30.60 | 38.10 | 47.37 | 47.42 | 53.00 | ----- | z | 39.87 | 39.59 | a | 23.71 | 35.64 | a | |||||||||
2015 | 24.06 | 25.64 | 29.68 | 30.73 | 38.03 | 52.03 | 57.10 | 56.23 | 51.93 | 41.90 | 25.63 | 19.74 | 37.73 | |||||||||||||
2016 | 18.97 | 22.90 | 27.94 | 31.43 | 37.16 | 52.27 | 55.35 | 53.35 | 48.20 | 40.00 | 29.67 | 21.71 | 36.58 | |||||||||||||
2017 | 21.16 | 25.64 | 29.03 | 31.33 | 37.94 | 50.10 | 56.48 | 53.19 | 47.30 | 36.10 | 31.70 | 21.90 | 36.82 | |||||||||||||
2018 | 20.00 | 23.50 | 24.70 | a | 31.80 | 40.77 | 49.20 | 55.03 | 55.13 | 50.27 | 38.23 | 21.57 | 18.90 | 35.76 | ||||||||||||
2019 | 16.90 | 18.32 | c | ----- | z | 31.40 | 36.03 | 48.53 | 48.53 | a | ----- | z | 48.22 | c | ----- | z | 28.37 | 22.35 | 33.19 | c | ||||||
2020 | 29.35 | 22.10 | 27.94 | 32.69 | a | ----- | z | ----- | z | ----- | z | ----- | z | 48.37 | 39.71 | ----- | z | ----- | z | 33.36 | f | |||||
2021 | ----- | z | 19.93 | a | 23.35 | 32.00 | a | 39.53 | a | 53.57 | 57.71 | 55.29 | c | 50.00 | d | 35.86 | b | 30.41 | a | 25.84 | 38.50 | a | ||||
2022 | 18.97 | a | 15.62 | b | 15.62 | e | 31.03 | 40.10 | a | 51.71 | b | 58.20 | a | 56.80 | a | 51.21 | a | 38.32 | c | ----- | z | 21.70 | a | 36.30 | a | |
2023 | 17.89 | d | 18.71 | d | 25.83 | b | 32.40 | 41.03 | b | 45.80 | 58.71 | ----- | z | 50.70 | c | 39.27 | a | 30.57 | b | 23.41 | b | 34.94 | a | |||
2024 | 20.65 | h | 24.28 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.28 | k |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.61 | 22.81 | 26.71 | 32.44 | 40.18 | 49.69 | 56.49 | 55.52 | 49.58 | 38.60 | 27.54 | 21.12 | 36.78 | |||||||||||||
S.D. | 3.59 | 3.90 | 2.85 | 2.25 | 2.39 | 2.56 | 2.13 | 1.64 | 2.13 | 3.04 | 3.07 | 2.73 | 0.96 | |||||||||||||
SKEW | 0.25 | -0.15 | -0.79 | 0.29 | 0.27 | -0.05 | -1.90 | -0.40 | -0.18 | 0.05 | 0.39 | -0.23 | 0.39 | |||||||||||||
MAX | 29.35 | 32.70 | 34.06 | 38.23 | 46.81 | 54.77 | 60.23 | 58.80 | 54.07 | 47.57 | 39.59 | 25.94 | 39.08 | |||||||||||||
MIN | 13.58 | 13.88 | 15.62 | 26.93 | 36.03 | 43.37 | 47.42 | 51.45 | 44.68 | 30.52 | 19.33 | 14.19 | 35.04 | |||||||||||||
YRS | 60 | 61 | 62 | 67 | 69 | 66 | 69 | 66 | 68 | 69 | 62 | 62 | 43 |