YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | 53.56 | e | 55.52 | 53.87 | 43.93 | 40.03 | 27.07 | 11.58 | 40.79 | e | ||||||
1963 | -6.48 | 2.21 | 22.68 | 34.46 | d | 42.55 | 54.21 | b | 56.35 | 53.35 | 49.50 | 44.19 | 28.70 | 2.32 | 32.00 | |||||||||||
1964 | 12.10 | 11.10 | 17.13 | 34.63 | 47.97 | 53.27 | ----- | z | 49.52 | f | 46.63 | 33.97 | 25.67 | 6.24 | b | 28.87 | b | |||||||||
1965 | -4.00 | -3.00 | g | 9.07 | a | 31.93 | 47.81 | 52.07 | b | 55.71 | ----- | z | 45.03 | 35.53 | a | 23.53 | 20.87 | a | 31.76 | b | ||||||
1966 | -9.94 | 2.61 | 23.81 | 30.53 | 35.84 | 52.77 | 60.77 | 53.03 | 44.63 | 33.81 | 22.79 | b | 11.00 | 30.14 | ||||||||||||
1967 | 5.00 | -3.86 | 19.77 | 35.43 | 37.61 | 55.33 | 54.48 | 51.55 | 43.60 | 35.63 | a | 20.60 | 13.03 | 30.68 | ||||||||||||
1968 | 4.68 | 3.45 | 23.10 | a | 33.74 | c | 41.55 | 54.50 | 58.42 | 56.32 | 47.37 | 40.26 | 25.20 | 9.68 | 33.19 | |||||||||||
1969 | 0.52 | 9.14 | 13.68 | 35.77 | 45.81 | 47.63 | 59.90 | 56.65 | 46.93 | 34.90 | 22.73 | 9.58 | 31.94 | |||||||||||||
1970 | -6.29 | 2.46 | 16.26 | 32.87 | 48.13 | 56.13 | 59.32 | 55.94 | 48.70 | 38.10 | 25.10 | a | 7.31 | b | 32.00 | |||||||||||
1971 | -6.32 | 4.43 | 15.68 | 31.57 | 37.35 | 58.97 | 53.13 | 52.06 | 49.47 | 42.77 | 25.40 | 12.32 | 31.40 | |||||||||||||
1972 | -5.61 | 0.31 | 17.61 | 30.43 | 46.45 | 49.50 | 55.84 | 57.58 | 46.93 | 33.16 | 24.72 | a | 2.13 | 29.92 | ||||||||||||
1973 | 4.42 | 9.68 | 29.39 | 32.86 | a | 40.39 | 53.73 | 58.48 | 55.94 | 48.03 | a | 43.26 | ----- | z | 9.32 | 35.05 | a | |||||||||
1974 | 5.29 | 5.22 | a | 22.58 | 34.83 | a | 41.68 | 51.53 | 61.32 | 55.00 | 42.38 | a | 36.07 | a | 25.60 | 17.06 | 33.21 | |||||||||
1975 | 4.62 | b | 6.07 | 12.45 | 28.37 | 48.42 | 56.43 | 60.68 | 60.16 | 45.23 | 41.81 | d | 27.20 | e | 15.81 | 33.94 | ||||||||||
1976 | 5.00 | 18.34 | 26.23 | a | 37.30 | c | 42.42 | 56.93 | 60.97 | 56.16 | 44.83 | 31.65 | 16.57 | -0.60 | a | 32.98 | ||||||||||
1977 | 3.55 | t | 15.82 | f | 30.39 | 39.77 | 52.03 | 54.28 | a | 59.97 | 55.64 | c | 52.13 | 36.97 | 29.78 | c | 11.34 | b | 42.23 | b | ||||||
1978 | ----- | z | -0.12 | c | 17.68 | 35.27 | 47.81 | 55.33 | 61.03 | 58.52 | 54.10 | a | 38.68 | 23.47 | 6.19 | d | 36.18 | a | ||||||||
1979 | -9.42 | -1.04 | 21.71 | 32.89 | b | 43.32 | 54.77 | 60.06 | 58.74 | ----- | z | 38.39 | 27.53 | 19.30 | a | 31.48 | a | |||||||||
1980 | 8.03 | 7.48 | 18.84 | 37.13 | 46.80 | a | 55.80 | 60.23 | 58.13 | 51.07 | 36.13 | 29.17 | 14.16 | 35.25 | ||||||||||||
1981 | 9.93 | b | 15.37 | a | 29.16 | 41.44 | c | 44.57 | a | 59.15 | c | 64.00 | c | 61.71 | 48.90 | a | 36.74 | 28.33 | 11.26 | 37.55 | ||||||
1982 | -4.75 | c | 6.12 | b | 21.97 | a | 31.00 | 52.07 | a | 49.00 | a | 61.07 | a | 56.26 | 48.70 | ----- | z | ----- | z | 15.52 | 33.69 | b | ||||
1983 | 11.00 | 19.15 | a | 24.90 | a | 28.70 | 40.55 | b | 54.47 | 64.06 | 61.35 | 48.83 | a | 37.00 | b | 27.83 | a | -5.65 | 34.35 | |||||||
1984 | 1.03 | a | 16.61 | a | 13.32 | 34.30 | 40.06 | 56.00 | 53.50 | a | 56.97 | 46.47 | 42.73 | a | 24.77 | 10.63 | a | 33.03 | ||||||||
1985 | 2.90 | a | 5.57 | 26.83 | a | 40.07 | 49.30 | a | 50.23 | 56.61 | 54.35 | 51.27 | 37.26 | 19.23 | -3.89 | c | 32.48 | |||||||||
1986 | 6.80 | a | 7.79 | 21.23 | 39.17 | a | 46.73 | a | 56.13 | 61.90 | a | 52.87 | a | 50.93 | 37.39 | 19.27 | 16.33 | a | 34.71 | |||||||
1987 | 11.32 | 17.64 | 26.81 | 36.30 | 47.65 | 55.17 | 62.68 | 57.06 | 49.75 | b | 31.16 | 28.50 | 18.55 | 36.88 | ||||||||||||
1988 | -0.14 | b | 2.00 | 22.32 | 30.70 | 46.55 | 53.23 | 57.81 | 59.87 | 46.37 | 27.81 | 24.17 | 8.50 | c | 31.60 | |||||||||||
1989 | 10.39 | -2.78 | a | 15.20 | a | 31.33 | 41.06 | 50.72 | a | 58.48 | 54.74 | 44.37 | 33.35 | 17.97 | -0.42 | 29.54 | ||||||||||
1990 | 13.71 | 9.11 | 23.61 | 32.23 | 41.57 | a | 54.10 | 57.52 | 56.00 | a | 49.87 | 33.48 | 30.53 | 10.57 | a | 34.36 | ||||||||||
1991 | 5.83 | a | 16.30 | a | 24.50 | a | 38.66 | a | 52.90 | a | 63.53 | 61.10 | 60.50 | a | 49.70 | 36.21 | c | 19.14 | a | 15.43 | a | 36.98 | ||||
1992 | 17.48 | b | 22.74 | b | 24.74 | 35.27 | 46.10 | 52.13 | 55.38 | b | 54.35 | 49.24 | a | 37.03 | 28.25 | b | 15.54 | e | 36.52 | |||||||
1993 | 4.64 | f | 7.35 | b | 20.30 | a | 32.07 | a | 47.32 | 53.43 | 61.26 | 60.68 | 45.50 | b | 36.62 | b | 26.82 | b | 18.70 | d | 37.28 | a | ||||
1994 | -4.03 | b | 4.42 | b | 25.90 | a | 33.35 | d | 46.52 | 57.30 | 56.61 | 54.52 | 52.24 | a | 42.07 | a | 28.19 | c | 19.60 | a | 34.72 | |||||
1995 | 10.37 | d | 10.22 | e | 27.48 | b | 30.71 | b | 41.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.13 | g | |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.97 | a | 54.03 | 53.39 | 45.83 | a | 33.58 | 16.20 | 5.77 | a | 37.54 | e | ||||
1997 | -5.50 | a | 8.52 | a | 16.00 | 27.97 | 33.19 | 53.43 | 58.70 | a | 54.48 | b | 48.73 | 36.06 | 19.00 | a | 18.80 | a | 30.78 | |||||||
1998 | 12.42 | 22.71 | 21.87 | a | 36.39 | b | 46.74 | 52.32 | b | 59.27 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.96 | e | |||
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.14 | a | 12.32 | 18.73 | j | |
2000 | 0.10 | 13.52 | 25.97 | 30.43 | 44.33 | a | 52.10 | 59.06 | 57.00 | 45.23 | 36.52 | 23.63 | -3.19 | 32.06 | ||||||||||||
2001 | 5.83 | a | -2.07 | 15.52 | 31.42 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 6.43 | i | ||
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.71 | x | 56.07 | d | 50.45 | a | 32.48 | 21.80 | e | 15.10 | a | 35.18 | g | |
2003 | 3.73 | a | 3.15 | a | 19.48 | b | 33.57 | 43.23 | a | 53.20 | 57.48 | 57.00 | a | 44.86 | b | 32.80 | a | 24.32 | b | 13.70 | a | 32.21 | ||||
2004 | 1.48 | b | 6.84 | d | 27.03 | 32.38 | a | 42.97 | 51.72 | a | 57.93 | a | 51.77 | a | 50.39 | b | 37.50 | a | 26.23 | 13.87 | a | 33.34 | ||||
2005 | 6.33 | a | 15.30 | a | 17.38 | b | 35.97 | 43.30 | a | 61.18 | b | 60.83 | a | 56.16 | 50.19 | d | 37.65 | 24.97 | a | 8.03 | a | 34.77 | ||||
2006 | 20.23 | a | 7.81 | a | 22.27 | a | 37.57 | 46.55 | b | 54.33 | 60.87 | 58.86 | b | 46.50 | 31.19 | 25.73 | 20.68 | 36.05 | ||||||||
2007 | 9.13 | 0.04 | 23.90 | a | 33.20 | 49.03 | a | 56.87 | 58.77 | 59.03 | a | 48.80 | 42.87 | a | 23.03 | 6.13 | a | 34.23 | ||||||||
2008 | 0.48 | -0.59 | 12.77 | 30.17 | a | 35.07 | a | 48.87 | 56.68 | 53.71 | 48.90 | 33.35 | 22.03 | a | -1.27 | a | 28.35 | |||||||||
2009 | -11.83 | b | 7.22 | a | 19.55 | 30.57 | 43.40 | a | 53.00 | 53.23 | 53.84 | 48.79 | a | 34.00 | 28.47 | 6.58 | 30.57 | |||||||||
2010 | -0.45 | -0.11 | 22.41 | d | 36.87 | 45.43 | a | 56.47 | 62.77 | a | 61.74 | 46.86 | a | 35.45 | 24.43 | 4.00 | 32.99 | |||||||||
2011 | -1.74 | 5.61 | 17.81 | 34.13 | 45.10 | 56.21 | a | 65.10 | a | 57.62 | b | 47.43 | 36.65 | 26.83 | a | 14.48 | 33.77 | |||||||||
2012 | 8.55 | b | 17.34 | 36.93 | a | 34.43 | 49.00 | a | 56.07 | a | 64.00 | 55.19 | 41.25 | b | 32.26 | 24.00 | b | 13.77 | a | 36.07 | ||||||
2013 | 4.00 | 7.19 | b | 12.68 | 30.20 | 44.03 | 56.13 | 59.94 | 56.94 | 49.10 | 34.97 | 20.14 | a | 4.13 | 31.62 | |||||||||||
2014 | -7.97 | -11.36 | 12.16 | 30.62 | a | 44.10 | 58.07 | 56.81 | 59.42 | 48.67 | 33.80 | a | 16.70 | 17.61 | 29.89 | |||||||||||
2015 | 5.03 | -4.93 | 17.94 | 33.57 | 46.55 | 56.20 | 58.16 | 55.87 | 54.89 | b | 35.06 | 30.00 | b | 25.45 | 34.48 | |||||||||||
2016 | 3.97 | 12.57 | a | 28.63 | a | 35.33 | 43.16 | 55.50 | 61.39 | 60.26 | 53.53 | 40.16 | 29.93 | a | 11.39 | 36.32 | ||||||||||
2017 | 9.93 | a | 16.56 | a | 22.10 | 37.57 | 45.10 | 54.79 | a | 60.17 | a | 56.17 | a | 50.73 | 38.97 | 22.50 | 8.90 | 35.29 | ||||||||
2018 | -1.45 | 0.64 | 19.68 | 20.93 | 51.42 | 61.20 | 60.52 | 59.45 | 53.40 | 35.13 | 19.93 | 17.10 | 33.16 | |||||||||||||
2019 | 2.87 | -1.89 | 13.55 | 32.17 | 44.23 | 55.87 | 63.97 | 57.68 | 55.17 | 36.32 | 22.33 | 10.16 | 32.70 | |||||||||||||
2020 | 11.23 | 2.34 | 26.84 | 30.00 | 45.32 | 57.87 | 63.42 | 58.84 | 47.47 | 30.58 | 26.30 | 14.23 | 34.54 | |||||||||||||
2021 | 11.65 | -3.64 | 26.68 | 34.60 | 45.55 | 60.47 | 60.52 | 58.90 | 48.43 | 42.39 | 25.10 | 12.87 | 35.29 | |||||||||||||
2022 | -8.00 | 0.46 | 21.29 | 29.57 | 46.32 | 56.73 | 60.48 | 60.03 | 51.13 | 35.10 | 25.23 | 8.39 | 32.23 | |||||||||||||
2023 | 13.52 | 6.54 | 18.77 | 34.67 | 46.74 | d | 56.83 | 58.26 | 60.90 | 53.60 | 40.10 | 22.67 | 22.58 | 36.26 | ||||||||||||
2024 | 13.07 | b | 20.72 | 23.32 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.04 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 3.57 | 6.76 | 21.17 | 33.47 | 44.71 | 54.84 | 59.24 | 56.79 | 48.47 | 36.48 | 24.39 | 11.03 | 33.33 | |||||||||||||
S.D. | 7.47 | 7.60 | 5.48 | 3.53 | 4.08 | 3.10 | 2.92 | 2.68 | 3.11 | 3.59 | 3.63 | 6.82 | 2.21 | |||||||||||||
SKEW | -0.13 | 0.26 | 0.11 | -0.41 | -0.57 | 0.20 | -0.22 | 0.02 | 0.07 | 0.24 | -0.46 | -0.44 | -0.09 | |||||||||||||
MAX | 20.23 | 22.74 | 36.93 | 41.44 | 52.90 | 63.53 | 65.10 | 61.74 | 55.17 | 44.19 | 30.53 | 25.45 | 37.55 | |||||||||||||
MIN | -11.83 | -11.36 | 9.07 | 20.93 | 33.19 | 47.63 | 53.13 | 51.55 | 41.25 | 27.81 | 16.20 | -5.65 | 28.35 | |||||||||||||
YRS | 56 | 57 | 59 | 57 | 57 | 58 | 57 | 56 | 57 | 57 | 57 | 59 | 47 |