YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 49.65 | 58.23 | 58.52 | 59.68 | 51.13 | 38.97 | 26.30 | 27.42 | 46.24 | d | ||||||||
1960 | 21.10 | 21.50 | a | 29.10 | 38.90 | 44.55 | 55.13 | 55.77 | 54.87 | 48.23 | 37.45 | 33.10 | 21.45 | b | 38.43 | |||||||||||
1961 | 19.26 | 24.15 | a | 31.23 | 36.13 | 46.87 | 56.10 | 57.94 | 58.58 | 49.59 | a | 40.06 | 29.13 | 22.39 | 39.29 | |||||||||||
1962 | 18.06 | 28.43 | 25.77 | 38.20 | 47.81 | 52.90 | 59.39 | 58.16 | 53.33 | 42.90 | 31.77 | 25.71 | 40.20 | |||||||||||||
1963 | 14.29 | 27.75 | 30.29 | 42.33 | 50.03 | 56.10 | 61.32 | 60.71 | 55.53 | 47.52 | 33.70 | 20.87 | 41.70 | |||||||||||||
1964 | 22.32 | 20.11 | a | 26.77 | 37.07 | 47.74 | 54.90 | 61.52 | 60.10 | 54.67 | 42.71 | 32.00 | 24.87 | 40.40 | ||||||||||||
1965 | 25.71 | 21.46 | 22.90 | 41.23 | 47.77 | 54.60 | 60.84 | 58.26 | 52.20 | 42.06 | 37.27 | 27.29 | 40.97 | |||||||||||||
1966 | 18.42 | 20.36 | 32.00 | 38.57 | 47.23 | 56.57 | 63.10 | 57.29 | 53.00 | 39.58 | 34.07 | 20.77 | 40.08 | |||||||||||||
1967 | 23.29 | 24.79 | 34.77 | 43.43 | 45.06 | 56.37 | 60.19 | 57.00 | 51.67 | 41.81 | 32.53 | 20.13 | 40.92 | |||||||||||||
1968 | 24.32 | 25.55 | 31.71 | 36.23 | 46.65 | 56.27 | 59.84 | 59.26 | 50.23 | 42.61 | 32.20 | 23.19 | 40.67 | |||||||||||||
1969 | 27.00 | b | 27.96 | 23.90 | 42.30 | 49.19 | 56.10 | 63.29 | 62.45 | 54.37 | 40.26 | 32.72 | a | 28.32 | 42.32 | |||||||||||
1970 | 20.90 | 30.04 | 27.97 | 38.91 | h | 50.71 | 56.60 | 62.52 | 59.87 | 50.63 | 38.74 | 33.57 | 28.26 | 41.80 | a | |||||||||||
1971 | 23.90 | 24.39 | 30.48 | 40.80 | 46.00 | 55.20 | 60.26 | 57.77 | 51.57 | 43.00 | 34.50 | 27.77 | 41.30 | |||||||||||||
1972 | 21.33 | d | 25.62 | 34.23 | 39.10 | 47.93 | a | 53.63 | 57.39 | 58.39 | 53.90 | 43.83 | a | 27.20 | 22.26 | 40.40 | ||||||||||
1973 | 21.32 | 24.75 | 30.45 | 33.72 | a | 44.77 | 52.43 | 59.10 | 58.26 | 50.63 | 41.61 | 32.50 | 23.06 | 39.39 | ||||||||||||
1974 | 22.19 | 24.71 | 34.74 | 37.60 | 50.06 | 56.63 | 60.52 | 58.19 | 48.73 | 44.03 | 31.80 | 22.39 | 40.97 | |||||||||||||
1975 | 23.03 | 24.57 | 28.84 | 35.00 | 42.58 | 54.47 | 58.83 | a | 58.65 | 50.20 | 39.87 | 28.10 | 23.84 | 39.00 | ||||||||||||
1976 | 19.19 | 29.76 | 28.13 | 39.17 | 45.13 | 55.23 | 59.06 | 57.87 | 53.03 | 37.00 | 23.73 | 20.26 | 38.96 | |||||||||||||
1977 | 16.97 | 25.82 | 29.52 | 40.33 | 49.10 | 58.53 | 61.84 | 61.65 | 54.67 | 42.71 | 30.00 | 26.97 | 41.51 | |||||||||||||
1978 | 18.10 | 21.86 | 31.16 | 41.50 | 46.74 | 58.00 | 62.58 | 58.58 | 53.40 | 42.55 | 35.80 | 19.58 | 40.82 | |||||||||||||
1979 | 16.00 | 25.68 | 30.87 | 38.97 | 47.00 | 54.87 | 61.16 | 57.97 | 52.57 | 43.32 | 27.30 | 23.81 | 39.96 | |||||||||||||
1980 | 23.55 | 24.93 | 27.68 | 34.97 | 45.58 | 60.00 | 64.61 | 61.06 | 55.10 | 38.87 | 28.70 | 29.29 | 41.20 | |||||||||||||
1981 | 22.68 | 23.79 | 31.52 | 42.33 | 46.61 | 58.23 | 62.48 | 59.19 | 53.77 | 43.03 | 36.07 | 26.16 | 42.16 | |||||||||||||
1982 | 22.67 | a | 23.46 | 32.19 | 39.57 | 47.39 | 55.60 | 60.58 | 60.97 | 54.33 | 41.23 | 31.93 | 24.52 | 41.20 | ||||||||||||
1983 | 23.32 | 27.64 | 31.84 | 34.17 | 42.52 | 52.50 | 60.00 | 61.19 | 54.90 | 44.97 | a | 33.62 | a | 16.52 | 40.27 | |||||||||||
1984 | 20.26 | 24.10 | 25.87 | ----- | z | ----- | z | ----- | z | ----- | z | 60.00 | 50.03 | 40.71 | 32.70 | 25.60 | a | 34.91 | d | |||||||
1985 | 19.53 | a | 23.81 | a | 33.90 | 40.03 | a | 49.00 | a | 56.50 | b | 58.62 | j | 59.58 | 52.00 | b | 42.65 | 29.83 | a | 19.14 | b | 38.73 | a | |||
1986 | 24.81 | 25.96 | 34.00 | b | 39.13 | 46.43 | a | 57.17 | 60.19 | 60.67 | d | 53.20 | 41.93 | a | 29.23 | 24.53 | a | 41.44 | ||||||||
1987 | 22.00 | 28.71 | 28.81 | 36.03 | 47.48 | 56.68 | b | 59.39 | 59.27 | a | 51.17 | 42.17 | a | 29.40 | 18.58 | 39.97 | ||||||||||
1988 | 19.23 | 22.69 | 26.87 | 36.72 | a | 46.50 | a | 56.69 | d | 60.06 | 60.50 | a | 51.55 | a | 42.83 | a | 31.07 | a | 21.48 | 39.68 | ||||||
1989 | 23.32 | 22.07 | 31.30 | a | 40.43 | b | 50.84 | 55.53 | 59.87 | 60.73 | a | 50.93 | 42.00 | 30.63 | 16.90 | 40.38 | ||||||||||
1990 | 21.45 | 23.70 | a | 31.04 | g | 38.80 | 45.93 | b | 60.87 | 60.52 | 57.76 | b | 55.97 | 39.87 | 32.00 | 17.97 | 41.35 | a | ||||||||
1991 | 20.71 | 26.77 | b | 30.16 | 37.48 | a | 48.68 | 56.45 | a | 60.17 | b | 59.68 | c | 52.80 | 39.68 | 28.67 | 25.52 | 40.56 | ||||||||
1992 | 22.90 | 28.86 | 31.63 | a | 40.59 | c | 47.23 | 53.30 | 58.67 | d | 57.72 | b | 52.00 | 42.43 | a | 26.37 | 22.42 | 40.34 | ||||||||
1993 | 23.35 | 25.07 | a | 30.13 | a | 37.90 | a | 46.70 | a | 56.34 | a | 61.62 | b | 59.25 | c | 49.24 | e | 38.06 | 26.17 | 23.00 | a | 39.74 | ||||
1994 | 20.97 | 21.75 | 31.31 | b | 37.40 | 48.59 | i | 58.10 | 61.13 | 60.26 | 53.88 | d | 42.00 | 31.57 | 26.94 | 40.48 | a | |||||||||
1995 | 25.80 | a | 29.04 | 31.83 | a | 35.53 | 45.68 | 55.03 | 60.45 | 61.41 | b | 52.59 | c | 40.52 | ----- | z | 25.81 | 42.15 | a | |||||||
1996 | 21.26 | 26.48 | 26.16 | 37.79 | a | 51.87 | 59.03 | 62.61 | 60.19 | 51.43 | 39.73 | a | 31.97 | 23.42 | 41.00 | |||||||||||
1997 | 21.50 | a | 26.04 | 31.39 | 34.43 | 46.87 | a | 56.27 | 60.76 | b | 59.74 | 55.27 | 40.97 | a | 28.63 | 19.45 | 40.11 | |||||||||
1998 | 25.74 | 28.14 | 27.32 | 34.23 | 48.13 | 55.10 | 62.17 | b | 59.32 | 55.60 | ----- | z | 34.53 | 22.61 | 41.17 | a | ||||||||||
1999 | 25.84 | 27.36 | 31.84 | 37.70 | 45.94 | 54.63 | 60.71 | 60.41 | d | 52.27 | 40.34 | b | 33.33 | 23.84 | 41.18 | |||||||||||
2000 | 24.87 | 29.28 | 31.94 | 39.17 | 50.03 | 58.10 | j | 62.17 | b | 61.29 | 53.07 | 44.87 | a | 26.48 | a | 19.39 | 40.23 | a | ||||||||
2001 | 21.55 | 25.82 | 32.60 | a | 40.79 | a | 47.90 | 57.28 | a | 64.37 | a | 60.61 | 53.10 | 41.72 | b | 35.38 | a | 23.24 | b | 42.03 | ||||||
2002 | 23.18 | c | 22.79 | 26.77 | 42.45 | a | 47.03 | 60.24 | e | 60.92 | e | 60.42 | 53.93 | 41.60 | a | 31.00 | 24.60 | a | 41.24 | |||||||
2003 | 24.45 | 24.85 | a | 30.59 | b | 38.00 | 48.00 | c | 55.10 | 63.50 | e | 61.06 | 52.17 | a | 46.11 | d | 32.79 | b | 22.23 | 41.57 | ||||||
2004 | 24.83 | a | 21.66 | 36.19 | 37.97 | a | 49.48 | b | 55.77 | 58.84 | 56.93 | a | 52.43 | 43.42 | 30.77 | 25.10 | b | 41.12 | ||||||||
2005 | 27.76 | b | 29.12 | c | 29.06 | 36.21 | b | 47.42 | 53.83 | 59.93 | c | 57.81 | 54.67 | 42.19 | 29.85 | c | 23.14 | c | 40.92 | |||||||
2006 | 25.71 | 22.32 | 31.32 | 40.97 | 49.69 | b | 59.59 | a | 61.97 | b | 61.03 | a | 49.38 | a | 41.00 | 30.55 | a | 23.33 | d | 41.40 | ||||||
2007 | 18.97 | b | 25.77 | b | 34.56 | d | 35.21 | b | 46.61 | c | 55.03 | a | 58.48 | f | 61.63 | d | 54.91 | g | 42.29 | 29.34 | a | 23.31 | b | 37.27 | b | |
2008 | 17.52 | j | 24.72 | 29.48 | b | 34.41 | a | 46.19 | 56.87 | 61.03 | 59.52 | 52.14 | a | 42.55 | 31.74 | k | 20.64 | c | 42.76 | b | ||||||
2009 | 22.42 | 27.75 | 32.32 | 36.82 | b | 48.20 | k | 57.07 | 60.81 | 60.48 | 50.70 | 39.31 | b | 33.42 | f | 18.32 | 40.60 | b | ||||||||
2010 | 21.03 | 23.21 | 30.10 | 40.50 | 46.58 | 60.40 | 62.19 | 60.42 | 56.08 | e | 43.61 | 27.97 | a | 26.81 | 41.58 | |||||||||||
2011 | 18.94 | 18.79 | 31.84 | 39.23 | 45.16 | 58.14 | b | 64.65 | 65.42 | 53.69 | a | 41.36 | c | 31.13 | 22.61 | c | 40.91 | |||||||||
2012 | 25.61 | 25.03 | 33.55 | 43.50 | b | 50.06 | 59.97 | 63.36 | c | 61.90 | 53.79 | a | 41.19 | 32.57 | 23.96 | f | 44.59 | a | ||||||||
2013 | 20.58 | 22.75 | 30.84 | 33.20 | 46.88 | g | 59.38 | a | 62.13 | 60.84 | 57.03 | 39.29 | 29.80 | 22.03 | 39.81 | a | ||||||||||
2014 | 21.06 | 23.96 | 29.45 | 37.28 | a | 46.61 | 58.23 | 61.23 | e | 59.65 | 54.73 | 44.87 | 27.37 | 24.48 | 40.74 | |||||||||||
2015 | 23.10 | 24.75 | 32.83 | b | 38.48 | a | 46.38 | e | 57.53 | 62.48 | 61.03 | b | 57.69 | a | 47.06 | 31.04 | d | 26.71 | 42.42 | |||||||
2016 | 23.97 | 28.14 | 33.39 | 38.17 | 44.65 | 57.63 | 63.25 | c | 59.00 | 54.50 | 44.56 | f | 36.88 | d | 23.03 | a | 42.06 | a | ||||||||
2017 | 25.03 | 29.00 | c | 35.39 | 39.73 | 45.09 | h | 56.54 | b | 61.71 | 60.00 | 54.33 | c | 42.97 | 34.90 | 21.90 | 41.95 | a | ||||||||
2018 | 21.48 | 23.57 | 32.61 | 36.33 | 51.71 | 59.85 | c | 62.11 | c | 59.97 | 54.43 | 43.13 | a | 29.36 | b | 24.03 | a | 41.55 | ||||||||
2019 | 23.13 | a | 24.79 | 30.52 | b | 39.66 | a | 45.79 | b | 56.36 | b | 62.35 | 62.32 | 59.19 | c | 37.35 | 29.77 | 25.68 | 41.41 | |||||||
2020 | 26.26 | 24.72 | 37.45 | 38.23 | 49.77 | 59.00 | 64.55 | b | 62.48 | 51.10 | 39.39 | 34.67 | 22.81 | 42.54 | ||||||||||||
2021 | 23.39 | 19.86 | 31.65 | 37.14 | a | 49.71 | 59.37 | 61.67 | d | 61.03 | a | 55.86 | a | 42.90 | 33.30 | 30.19 | 42.17 | |||||||||
2022 | 18.74 | 17.96 | 29.52 | 40.04 | b | 49.38 | b | 61.07 | 65.68 | 62.90 | 56.37 | 43.69 | b | 29.69 | d | 24.48 | 41.63 | |||||||||
2023 | 24.27 | a | 25.64 | 31.68 | c | 36.23 | 49.13 | 56.73 | 64.65 | 63.71 | 57.33 | 44.07 | b | 32.53 | 27.58 | 42.80 | ||||||||||
2024 | 21.84 | 28.64 | a | 32.70 | a | 39.83 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.75 | h | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 22.18 | 24.99 | 30.76 | 38.34 | 47.49 | 56.73 | 61.23 | 59.91 | 53.11 | 41.79 | 31.17 | 23.44 | 40.87 | |||||||||||||
S.D. | 2.73 | 2.79 | 2.83 | 2.49 | 2.03 | 2.08 | 1.92 | 1.76 | 2.30 | 2.21 | 2.87 | 3.04 | 0.98 | |||||||||||||
SKEW | -0.42 | -0.24 | -0.38 | -0.01 | -0.03 | 0.13 | -0.08 | 0.15 | 0.15 | 0.10 | -0.15 | -0.10 | -0.32 | |||||||||||||
MAX | 27.76 | 30.04 | 37.45 | 43.50 | 51.87 | 61.07 | 65.68 | 65.42 | 59.19 | 47.52 | 37.27 | 30.19 | 42.80 | |||||||||||||
MIN | 14.29 | 17.96 | 22.90 | 33.20 | 42.52 | 52.43 | 55.77 | 54.87 | 48.23 | 37.00 | 23.73 | 16.52 | 38.43 | |||||||||||||
YRS | 64 | 65 | 64 | 63 | 60 | 63 | 62 | 65 | 64 | 63 | 62 | 64 | 49 |