YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.41 | t | 21.16 | b | 11.88 | a | 16.52 | j |
1941 | 6.59 | c | 14.50 | 20.74 | 29.52 | 44.55 | 49.45 | 56.26 | 54.77 | 46.70 | 39.00 | 25.73 | 12.76 | 33.38 | ||||||||||||
1942 | 2.79 | b | 5.80 | 12.26 | 32.55 | 41.27 | 52.95 | 56.58 | 54.40 | 48.45 | 39.97 | a | 28.62 | 13.40 | a | 32.42 | ||||||||||
1943 | 10.88 | b | 14.50 | d | 16.69 | 35.76 | a | 41.33 | a | 49.98 | 57.39 | 56.28 | a | 49.74 | a | 38.92 | 27.18 | 16.81 | 34.62 | |||||||
1944 | 14.41 | c | 12.93 | a | 16.77 | 26.35 | 40.56 | 50.57 | 56.19 | 54.28 | a | 48.33 | 40.57 | a | 23.83 | a | 13.23 | 33.17 | ||||||||
1945 | 9.10 | 16.09 | 17.13 | a | 24.95 | b | 42.55 | b | 46.98 | 55.53 | 55.34 | 45.70 | 40.26 | 23.42 | 8.40 | 32.12 | ||||||||||
1946 | 3.42 | a | 11.21 | 20.11 | 36.19 | a | 40.73 | 51.55 | 57.21 | 55.08 | a | 49.07 | 36.37 | 22.80 | 14.65 | 33.20 | ||||||||||
1947 | 5.63 | 13.11 | 19.11 | 29.55 | 44.31 | 49.65 | 56.58 | 57.37 | 50.57 | 41.85 | a | 22.10 | 11.50 | 33.44 | ||||||||||||
1948 | 11.63 | a | 13.62 | 14.60 | b | 28.62 | 43.29 | 50.28 | 56.39 | 54.84 | 51.05 | 38.68 | 17.65 | 9.85 | 32.54 | |||||||||||
1949 | 4.40 | 7.68 | 19.23 | 31.20 | 42.23 | 48.81 | d | 56.05 | b | 54.32 | 48.98 | 38.00 | 32.25 | 10.95 | 32.84 | |||||||||||
1950 | 9.26 | 11.88 | 16.95 | 32.50 | 40.08 | 51.00 | 54.56 | 51.58 | 47.02 | 42.58 | 26.05 | 13.53 | a | 33.08 | ||||||||||||
1951 | 8.26 | 13.55 | 17.24 | 30.63 | 42.58 | 48.32 | 58.71 | 54.37 | 47.97 | 36.79 | 17.00 | 9.44 | 32.07 | |||||||||||||
1952 | 7.77 | 7.28 | 12.16 | 30.67 | 41.53 | 53.75 | 56.18 | 55.24 | 49.47 | 41.11 | 22.10 | 6.47 | 31.98 | |||||||||||||
1953 | 14.34 | 8.00 | a | 19.68 | 24.62 | 38.15 | 52.95 | 57.61 | 54.21 | 49.10 | 39.58 | 28.77 | 12.87 | 33.32 | ||||||||||||
1954 | 13.56 | 16.13 | a | 19.79 | 36.63 | 45.11 | 52.18 | 58.24 | 54.58 | 49.92 | 42.35 | 30.85 | 6.89 | 35.52 | ||||||||||||
1955 | 4.24 | 5.45 | 17.00 | a | 28.62 | 42.35 | 49.32 | 56.44 | 56.50 | 49.28 | 39.13 | 21.20 | 12.89 | 31.87 | ||||||||||||
1956 | 13.50 | 8.22 | 18.63 | a | 28.98 | 44.35 | 54.00 | 55.92 | 52.08 | 49.32 | 36.79 | 14.98 | 5.97 | 31.90 | ||||||||||||
1957 | 9.53 | a | 17.34 | 19.69 | 27.42 | 37.27 | a | 48.95 | 56.58 | a | 55.98 | 47.15 | 38.85 | 22.08 | 11.32 | 32.68 | ||||||||||
1958 | 3.77 | 14.73 | 15.32 | 26.72 | 44.45 | 53.38 | 55.53 | 56.00 | 49.43 | 40.27 | 26.67 | 17.63 | 33.66 | |||||||||||||
1959 | 10.42 | 10.14 | 16.61 | 30.25 | 41.68 | 53.48 | 55.69 | 54.74 | 46.40 | 36.82 | 25.16 | a | 15.60 | 33.08 | ||||||||||||
1960 | 8.74 | b | 8.74 | 24.29 | 33.27 | 40.77 | 52.22 | 56.21 | 55.98 | 50.60 | a | 38.19 | 21.40 | a | 9.67 | b | 33.34 | |||||||||
1961 | 6.32 | 13.25 | 21.43 | a | 28.91 | a | 42.89 | 52.98 | 55.94 | 57.11 | 44.83 | a | 38.69 | 20.21 | b | 8.73 | 32.61 | |||||||||
1962 | 3.14 | b | 17.46 | b | 12.65 | 32.78 | a | 41.37 | a | 49.83 | 55.05 | a | 53.69 | 48.40 | 41.61 | 30.08 | 15.63 | 33.47 | ||||||||
1963 | 7.76 | 14.45 | 16.92 | 33.77 | 44.52 | 51.02 | 56.87 | 55.50 | 51.53 | 43.50 | 29.15 | 11.84 | 34.73 | |||||||||||||
1964 | 6.06 | 6.86 | 13.53 | 27.40 | 41.98 | 49.58 | 58.26 | 53.44 | 48.00 | 41.50 | 26.24 | a | 9.92 | 31.90 | ||||||||||||
1965 | 12.89 | 9.48 | 15.52 | 30.78 | 38.15 | 46.66 | a | 55.53 | a | 53.00 | 44.35 | 41.76 | 30.63 | 13.00 | a | 32.65 | ||||||||||
1966 | 2.57 | a | 5.08 | b | 18.95 | 32.19 | a | 42.65 | 49.67 | 58.21 | 54.02 | 48.18 | 39.34 | 27.90 | 7.85 | 32.22 | ||||||||||
1967 | 10.53 | 10.93 | 24.44 | 29.93 | 38.20 | d | 47.78 | 56.02 | 52.31 | b | 47.59 | a | 38.90 | b | 27.09 | a | 10.95 | 32.89 | ||||||||
1968 | 7.29 | b | 14.19 | 17.15 | 25.41 | a | 38.58 | 51.02 | 55.52 | 52.55 | 45.98 | 39.31 | 20.03 | 11.03 | a | 31.50 | ||||||||||
1969 | 14.76 | 7.74 | a | 13.71 | 33.68 | 45.23 | 47.77 | 57.60 | 58.13 | 49.07 | 31.79 | 21.60 | a | 10.45 | 32.63 | |||||||||||
1970 | 7.02 | 13.94 | a | 14.56 | 22.47 | 40.59 | b | 49.48 | 56.95 | 56.58 | 46.32 | 33.53 | 26.60 | 9.82 | 31.49 | |||||||||||
1971 | 13.11 | 12.36 | 17.66 | 30.87 | 38.92 | 49.90 | 54.69 | 54.42 | 45.10 | 38.47 | 24.60 | 8.37 | 32.37 | |||||||||||||
1972 | 9.58 | 13.03 | 24.03 | 32.12 | 41.82 | 51.83 | 55.87 | 53.68 | 48.37 | 40.18 | 18.97 | a | 5.92 | 32.95 | ||||||||||||
1973 | 4.42 | 8.95 | 17.85 | 23.93 | 40.39 | 49.72 | 54.81 | 54.60 | 47.23 | 39.50 | a | 28.32 | 11.45 | 31.76 | ||||||||||||
1974 | 5.70 | a | 6.79 | 23.50 | 27.90 | 45.24 | 51.23 | 55.63 | 52.16 | 46.83 | 40.08 | 22.80 | 8.11 | 32.16 | ||||||||||||
1975 | 10.05 | b | 7.36 | 19.34 | 24.53 | 38.81 | 47.92 | 55.66 | 53.76 | 47.83 | 38.26 | 24.82 | 11.24 | 31.63 | ||||||||||||
1976 | 7.55 | 15.45 | 15.61 | 31.13 | 42.66 | 50.32 | 56.40 | 53.23 | 48.57 | 36.40 | 25.98 | 15.79 | 33.26 | |||||||||||||
1977 | 8.00 | 16.09 | 18.98 | 34.67 | a | 42.61 | 53.30 | 55.65 | 54.85 | 48.93 | 39.71 | 28.38 | a | 14.85 | 34.67 | |||||||||||
1978 | 9.92 | a | 10.73 | 23.45 | 32.83 | 40.52 | 51.87 | 56.77 | 54.50 | a | 49.25 | 40.18 | a | 26.50 | 6.33 | a | 33.57 | |||||||||
1979 | 2.98 | 9.00 | 20.18 | 27.18 | 40.05 | 50.58 | 56.74 | 53.84 | 50.70 | 40.71 | 18.08 | 10.90 | 31.75 | |||||||||||||
1980 | 14.24 | 12.48 | 14.93 | b | 23.02 | 39.88 | c | 52.85 | 58.47 | 54.85 | 49.67 | 35.61 | 25.50 | 20.00 | b | 33.46 | ||||||||||
1981 | 10.40 | a | 13.98 | a | 18.65 | 33.52 | a | 41.34 | b | 54.70 | 57.68 | 54.50 | 47.95 | 35.77 | a | 26.92 | 14.33 | a | 34.14 | |||||||
1982 | 9.85 | a | 8.37 | a | 17.27 | 24.79 | a | 37.13 | a | 47.67 | 55.60 | 56.03 | 46.82 | 33.92 | 19.65 | c | 13.59 | b | 30.89 | |||||||
1983 | 7.56 | d | 10.71 | 18.36 | b | 19.72 | 32.15 | a | 44.60 | a | 56.29 | 55.48 | 45.10 | a | 35.40 | b | 18.71 | b | 10.54 | c | 29.55 | |||||
1984 | -4.77 | c | 3.16 | 9.35 | a | 19.59 | b | 36.71 | ----- | z | 53.31 | b | 52.08 | 43.43 | 30.71 | 16.06 | c | 5.67 | e | 24.12 | a | |||||
1985 | -6.32 | c | 6.04 | d | 15.84 | b | 26.25 | b | 37.45 | a | 46.76 | a | ----- | z | 50.92 | 40.00 | b | 31.22 | a | 18.71 | b | 6.88 | c | 24.89 | a | |
1986 | 4.29 | 12.86 | 17.23 | 25.89 | b | 34.52 | a | 46.93 | b | 48.92 | a | 49.24 | 39.93 | 30.86 | b | 18.73 | d | 0.95 | c | 27.53 | ||||||
1987 | 0.31 | d | 3.98 | b | 9.02 | e | 24.95 | b | 35.84 | 48.88 | ----- | z | 53.70 | a | 46.50 | 40.25 | a | 25.45 | a | 13.15 | d | 27.46 | a | |||
1988 | 5.12 | e | 12.39 | a | 17.09 | d | 33.20 | 41.48 | c | 53.66 | a | 56.76 | 56.43 | a | 47.15 | 41.76 | 24.68 | 7.16 | b | 33.07 | ||||||
1989 | 3.31 | b | 13.15 | a | 25.68 | 35.41 | b | 44.00 | 49.98 | 56.82 | 52.81 | 47.42 | 37.47 | b | 26.50 | b | 10.47 | 33.58 | ||||||||
1990 | 9.35 | d | 12.88 | 25.00 | 34.30 | 40.21 | 53.59 | a | 54.79 | 53.17 | a | 50.53 | 37.26 | 25.88 | 7.70 | a | 33.72 | |||||||||
1991 | 5.21 | 13.28 | a | 17.19 | 26.72 | 41.43 | c | 49.85 | 54.11 | 53.71 | 47.83 | a | 39.32 | a | 22.67 | 5.08 | e | 31.37 | ||||||||
1992 | 5.22 | b | 13.95 | 20.47 | 34.69 | a | 43.70 | d | 49.16 | b | 52.48 | b | 51.76 | 46.50 | a | 40.08 | a | 18.13 | 7.93 | b | 32.01 | |||||
1993 | 9.10 | g | 15.06 | a | 20.30 | a | 25.43 | a | 39.47 | a | 48.74 | c | 52.73 | a | 51.92 | a | 44.95 | b | 35.55 | c | 17.43 | c | 6.35 | a | 32.54 | a |
1994 | 8.95 | 11.05 | 21.09 | c | 29.09 | b | 41.87 | a | 52.77 | 54.80 | c | 55.13 | 46.60 | a | 35.93 | b | 21.88 | b | 10.45 | 32.47 | ||||||
1995 | 8.98 | a | 16.61 | 19.23 | 24.96 | c | 35.74 | b | 46.71 | a | 51.81 | 55.72 | a | 46.38 | a | 35.70 | d | 27.83 | a | 15.52 | c | 32.10 | ||||
1996 | 9.04 | c | 12.23 | c | 16.77 | 28.93 | c | 43.97 | 50.41 | a | 55.90 | 53.47 | 44.36 | a | 35.29 | b | 23.50 | 9.98 | f | 33.99 | a | |||||
1997 | 11.40 | f | 8.94 | c | 20.95 | a | 26.62 | 40.19 | 50.08 | 54.67 | b | 55.68 | a | 52.08 | 38.81 | e | 23.42 | e | 8.96 | c | 34.58 | a | ||||
1998 | 10.10 | 11.55 | 19.16 | c | 27.96 | b | 43.00 | b | 49.80 | c | 58.23 | c | 56.05 | b | 51.97 | 38.56 | e | 27.54 | c | 16.10 | b | 34.17 | ||||
1999 | 15.96 | d | 16.48 | b | 25.97 | b | 30.00 | e | 39.98 | b | 51.27 | b | 57.13 | 55.03 | a | 48.43 | c | 40.79 | b | 31.79 | a | 14.05 | a | 35.57 | ||
2000 | 15.47 | b | 18.72 | d | 21.74 | d | 35.91 | c | 47.65 | d | 53.35 | d | 57.85 | a | 57.02 | 51.00 | c | 40.88 | c | 20.07 | c | 14.70 | d | 36.20 | ||
2001 | 8.06 | f | 16.65 | b | 23.02 | b | 35.44 | d | 45.67 | d | 53.22 | e | 58.22 | b | 55.77 | a | 50.38 | b | 40.40 | e | 30.21 | b | 11.66 | 38.24 | a | |
2002 | 11.10 | e | 9.73 | b | 18.87 | d | 39.24 | c | 44.27 | c | 54.87 | c | 58.95 | a | 55.40 | b | 49.27 | d | 37.44 | 22.60 | d | 9.05 | a | 34.23 | ||
2003 | 15.03 | 12.28 | a | 22.81 | b | 32.87 | d | 45.60 | e | 50.50 | b | 59.48 | a | 57.20 | a | 47.90 | 45.45 | a | 24.42 | e | 13.98 | d | 35.63 | |||
2004 | 8.26 | d | 11.66 | a | 26.93 | d | 34.86 | b | 43.43 | d | 51.57 | b | 55.20 | a | 53.22 | b | 48.02 | f | 39.98 | c | 27.60 | a | 12.47 | a | 33.20 | a |
2005 | 14.38 | a | 15.05 | 20.50 | 31.98 | 44.42 | a | 50.77 | 58.19 | 54.55 | a | 49.92 | 40.71 | 26.07 | a | 9.04 | d | 34.63 | ||||||||
2006 | 8.37 | a | 11.39 | a | 21.50 | 35.47 | 44.84 | 53.83 | 57.94 | 54.84 | 45.57 | 37.06 | 26.13 | 16.84 | 34.48 | |||||||||||
2007 | 9.45 | a | 18.56 | a | 26.97 | a | 36.14 | e | 42.47 | b | 52.73 | 58.81 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.02 | e | ||
2008 | ----- | z | ----- | z | 16.98 | a | 26.00 | 41.80 | a | 51.82 | 57.34 | 56.62 | a | 48.95 | 40.73 | 31.27 | 14.95 | b | 38.64 | b | ||||||
2009 | 14.97 | 16.64 | 25.02 | 32.17 | 46.69 | 51.05 | a | 57.32 | 55.08 | 48.87 | 35.40 | a | 29.58 | 8.11 | 35.08 | |||||||||||
2010 | 9.00 | 10.22 | c | 18.98 | a | 33.21 | a | 42.98 | 54.22 | 57.85 | 56.00 | 50.72 | 39.69 | 23.83 | 17.57 | b | 34.52 | |||||||||
2011 | 6.37 | 8.96 | 22.05 | 31.88 | a | 39.58 | 51.27 | 59.00 | 57.40 | 49.27 | 38.42 | 23.90 | 13.13 | 33.44 | ||||||||||||
2012 | 13.29 | 10.71 | 24.94 | 38.23 | 45.29 | 54.97 | 59.03 | 56.65 | 49.47 | 40.05 | 28.97 | 12.18 | a | 36.15 | ||||||||||||
2013 | 5.23 | a | 6.50 | 19.03 | a | 31.28 | a | 42.16 | 53.52 | 58.71 | 55.98 | 51.17 | 36.40 | 26.78 | 10.00 | 33.06 | ||||||||||
2014 | 11.29 | 15.88 | 19.65 | 30.82 | 41.45 | 51.34 | a | 58.08 | 53.89 | 50.83 | a | 42.30 | a | 26.27 | 15.13 | 34.74 | ||||||||||
2015 | 14.87 | 18.22 | a | 27.45 | 33.82 | 41.29 | 54.25 | 55.89 | 55.87 | 51.42 | 43.53 | 26.18 | 12.89 | 36.31 | ||||||||||||
2016 | 5.77 | a | 14.47 | 24.32 | 33.33 | 41.45 | 54.93 | 56.81 | 53.82 | 49.02 | 42.00 | b | 31.13 | 13.23 | 35.02 | |||||||||||
2017 | 12.11 | 20.33 | b | 26.67 | a | 33.23 | b | 42.21 | 54.13 | 58.58 | 54.84 | 50.58 | 39.84 | 33.18 | 18.76 | 37.04 | ||||||||||
2018 | 13.56 | 17.61 | 24.42 | a | 36.03 | 45.85 | 54.45 | a | 59.68 | 55.89 | 50.33 | 38.82 | 22.38 | 9.35 | 35.70 | |||||||||||
2019 | 9.21 | 11.07 | 20.19 | 32.85 | 38.24 | 50.22 | 57.27 | 56.90 | 52.55 | 34.71 | 27.08 | 9.06 | 33.28 | |||||||||||||
2020 | 10.50 | a | 13.33 | 24.69 | 33.35 | 45.79 | 53.02 | 56.92 | 57.58 | 49.03 | 41.34 | 27.15 | 9.47 | a | 35.18 | |||||||||||
2021 | 11.53 | 13.18 | 19.63 | a | 33.70 | 42.23 | 54.45 | 59.44 | 55.94 | 51.62 | 39.18 | 32.15 | 17.95 | 35.92 | ||||||||||||
2022 | 5.13 | 10.29 | 19.00 | 33.27 | 43.82 | 53.35 | 58.90 | b | 57.84 | 52.73 | 38.79 | 23.06 | d | 13.05 | 34.10 | |||||||||||
2023 | 9.70 | a | 10.34 | 15.45 | 27.42 | 43.68 | 49.10 | 59.27 | 57.76 | 47.90 | t | 40.23 | 27.62 | 16.60 | 32.47 | a | ||||||||||
2024 | 11.58 | 13.91 | 23.21 | 33.12 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.23 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.56 | 12.03 | 19.37 | 30.42 | 41.65 | 51.07 | 56.58 | 54.79 | 48.32 | 38.70 | 24.79 | 11.49 | 33.32 | |||||||||||||
S.D. | 4.32 | 3.72 | 3.99 | 4.21 | 2.88 | 2.36 | 1.86 | 1.73 | 2.47 | 2.87 | 4.18 | 3.62 | 1.62 | |||||||||||||
SKEW | -0.72 | -0.19 | -0.07 | -0.37 | -0.63 | -0.28 | -1.09 | -0.46 | -0.94 | -0.72 | -0.23 | -0.05 | -0.31 | |||||||||||||
MAX | 15.96 | 20.33 | 27.45 | 39.24 | 47.65 | 54.97 | 59.68 | 58.13 | 52.73 | 45.45 | 33.18 | 20.00 | 37.04 | |||||||||||||
MIN | -6.32 | 3.16 | 9.02 | 19.59 | 32.15 | 44.60 | 48.92 | 49.24 | 39.93 | 30.71 | 14.98 | 0.95 | 27.53 | |||||||||||||
YRS | 80 | 83 | 84 | 83 | 83 | 82 | 81 | 82 | 80 | 82 | 83 | 82 | 72 |