YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | 38.56 | o | 51.20 | 57.81 | 51.90 | 47.37 | 42.35 | 24.50 | -1.42 | 39.10 | e | |||||||
1964 | 5.48 | 3.62 | 8.16 | 28.90 | 44.23 | 48.33 | 55.57 | a | 51.26 | 45.43 | 34.42 | 21.97 | -1.58 | 28.82 | ||||||||||||
1965 | -8.29 | -6.86 | 1.42 | 30.57 | 42.26 | 46.73 | 53.20 | a | 50.90 | 40.60 | 36.45 | 20.57 | 13.81 | 26.78 | ||||||||||||
1966 | -13.06 | 0.64 | 19.87 | 28.20 | 36.10 | 51.03 | 58.71 | 51.87 | 43.80 | 32.58 | 17.10 | 2.71 | 27.46 | |||||||||||||
1967 | 0.65 | -9.33 | j | 14.84 | 29.37 | 34.65 | 50.70 | 53.52 | 50.77 | 42.40 | 32.26 | 18.77 | 6.52 | 30.40 | a | |||||||||||
1968 | -2.55 | -3.21 | 20.74 | 31.20 | 39.55 | 50.27 | 56.10 | 54.55 | 46.53 | 38.61 | 22.57 | 3.45 | 29.82 | |||||||||||||
1969 | -5.32 | 5.29 | 7.42 | 31.37 | 41.87 | 44.03 | 52.35 | 55.45 | 46.03 | 32.77 | 21.93 | 7.19 | 28.37 | |||||||||||||
1970 | -9.74 | -3.86 | 5.23 | 27.80 | 40.13 | 52.60 | 56.61 | 54.39 | 46.33 | 36.19 | 21.30 | 2.03 | 27.42 | |||||||||||||
1971 | -10.06 | 0.96 | 12.26 | 28.40 | 36.45 | 53.07 | 52.55 | 51.03 | 47.40 | 40.19 | 22.33 | 4.65 | 28.27 | |||||||||||||
1972 | -11.71 | -7.55 | 9.68 | 27.23 | 44.23 | 47.80 | 55.87 | 54.65 | 42.50 | 30.90 | a | 22.33 | -2.74 | 26.10 | ||||||||||||
1973 | -1.84 | 1.11 | 26.26 | 28.57 | 39.10 | 51.43 | 55.94 | 57.52 | 44.23 | 40.45 | 21.60 | 2.17 | a | 30.54 | ||||||||||||
1974 | -6.29 | -5.11 | 11.06 | 30.13 | 37.45 | 49.60 | 57.45 | 51.71 | 38.00 | 32.32 | 23.57 | 10.42 | 27.53 | |||||||||||||
1975 | -3.17 | a | -0.36 | 4.16 | 24.13 | 44.10 | 51.53 | 59.74 | 51.29 | c | 42.23 | 34.23 | 20.70 | 2.73 | a | 27.61 | ||||||||||
1976 | -8.00 | 9.07 | a | 12.58 | 32.45 | a | 38.26 | 51.90 | 52.94 | 53.87 | 41.83 | 24.90 | 9.93 | -10.23 | 25.79 | |||||||||||
1977 | -18.59 | b | 2.89 | 21.81 | 34.46 | f | 47.72 | b | ----- | z | ----- | z | ----- | z | 46.11 | b | 32.25 | c | 17.73 | 0.55 | b | 18.81 | d | |||
1978 | -9.42 | ----- | z | 8.96 | c | 26.97 | a | 43.59 | b | 50.10 | 54.18 | c | 52.06 | 44.90 | 32.25 | g | 18.18 | b | -4.16 | 28.54 | b | |||||
1979 | -17.84 | -7.75 | 13.74 | 26.25 | b | 36.28 | b | 48.60 | 54.47 | a | 50.90 | 47.97 | a | 30.48 | f | 20.73 | 9.26 | 25.69 | a | |||||||
1980 | -7.30 | a | -5.82 | g | 14.26 | l | 29.37 | 42.16 | 49.60 | 54.81 | 52.97 | 42.40 | 30.21 | g | 21.43 | 1.81 | 31.92 | c | ||||||||
1981 | -1.29 | 8.04 | 20.70 | a | 31.50 | j | 39.19 | 50.70 | 55.19 | 54.10 | a | ----- | z | ----- | z | ----- | z | ----- | z | 32.38 | e | |||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | 27.90 | 37.54 | c | 52.40 | 61.45 | 59.94 | 48.47 | 36.39 | 23.40 | -10.34 | b | 37.46 | c | |||||||
1984 | -4.35 | 15.76 | 10.94 | 32.50 | 40.77 | a | 53.83 | a | 56.26 | 57.53 | a | 40.45 | a | 38.84 | 19.37 | 2.30 | a | 30.35 | ||||||||
1985 | -5.07 | a | -0.57 | 19.94 | 33.00 | 45.84 | 47.63 | 55.45 | 52.90 | 43.34 | a | 32.61 | 11.83 | -8.33 | a | 27.38 | ||||||||||
1986 | 2.35 | h | -1.79 | 16.94 | 33.62 | a | 42.42 | 50.82 | b | 59.13 | 52.26 | 46.10 | 34.87 | 16.67 | 9.30 | a | 32.76 | a | ||||||||
1987 | 9.04 | d | 14.96 | 21.90 | 33.63 | 44.53 | a | 53.30 | 59.71 | 54.97 | a | 45.67 | 32.16 | 24.10 | 12.63 | a | 33.88 | |||||||||
1988 | -8.32 | -6.55 | 16.90 | b | 28.18 | b | 46.97 | 52.63 | 58.84 | 56.77 | e | 46.03 | 28.07 | b | 20.50 | 2.71 | 28.56 | |||||||||
1989 | -2.97 | -13.68 | 10.63 | a | 27.55 | a | 42.00 | a | 50.47 | 58.23 | a | 53.16 | 44.57 | 31.42 | 15.77 | -4.68 | 26.04 | |||||||||
1990 | 9.94 | -0.96 | a | 17.30 | d | 29.72 | a | 38.32 | 53.17 | ----- | z | ----- | z | 49.37 | 33.07 | a | 25.00 | a | 2.83 | a | 25.77 | b | ||||
1991 | -5.10 | b | 5.32 | 16.65 | 32.31 | a | 47.19 | 55.38 | d | 58.97 | 59.33 | a | 47.50 | 34.65 | 15.41 | a | 3.54 | c | 30.93 | |||||||
1992 | 6.10 | 14.71 | a | 17.67 | a | 29.11 | k | 43.80 | a | 49.38 | a | 51.45 | 53.74 | 45.68 | e | 33.83 | a | 23.91 | g | 6.64 | c | 32.30 | b | |||
1993 | -3.71 | 0.88 | d | 12.06 | o | 28.43 | g | 43.07 | d | 50.76 | a | 56.35 | 55.83 | b | 43.72 | a | 31.90 | 18.68 | e | 5.81 | d | 30.33 | b | |||
1994 | -12.57 | a | -8.50 | d | 14.85 | e | 28.75 | f | 44.72 | b | 54.79 | a | 58.60 | a | 54.93 | a | 51.04 | b | 41.13 | h | 26.80 | e | 11.00 | m | 31.63 | c |
1995 | 1.71 | c | -3.58 | b | 19.36 | c | 27.83 | f | 42.31 | b | 57.92 | d | 58.62 | g | 60.48 | f | 45.92 | d | 36.55 | k | 13.73 | h | 3.14 | c | 23.83 | e |
1996 | -14.07 | a | -2.66 | 6.13 | a | 24.81 | d | 40.68 | c | 53.32 | b | 57.00 | d | 58.13 | a | 49.93 | 35.64 | c | 14.03 | 2.47 | a | 27.12 | ||||
1997 | -8.13 | 2.96 | b | 12.19 | e | 26.65 | d | 38.40 | a | 53.96 | c | 57.00 | e | 54.04 | c | 51.90 | a | 37.63 | a | 19.70 | c | 18.07 | b | 30.36 | ||
1998 | 3.93 | a | 20.88 | c | 18.43 | a | 33.77 | 46.89 | c | 53.86 | a | 58.36 | f | 57.12 | f | 51.52 | e | 39.24 | f | 27.46 | d | 11.21 | b | 29.77 | c | |
1999 | -0.29 | 10.39 | 23.07 | p | 32.56 | n | 44.46 | c | 55.07 | a | 62.35 | e | 57.04 | d | 49.26 | g | 34.27 | a | 28.00 | a | 12.50 | c | 33.75 | c | ||
2000 | 0.29 | ----- | z | 30.85 | r | 22.11 | k | 45.19 | d | 49.39 | b | 56.50 | a | 57.86 | b | 44.50 | d | 36.62 | j | 25.80 | -2.43 | a | 34.64 | d | ||
2001 | 5.13 | ----- | z | ----- | z | ----- | z | ----- | z | 51.03 | a | ----- | z | ----- | z | ----- | z | ----- | z | 30.07 | p | 16.26 | 24.14 | i | ||
2002 | 8.29 | 12.54 | 8.55 | 29.63 | 37.45 | 55.63 | 60.87 | 57.26 | 50.37 | 30.81 | 20.52 | a | 14.32 | 32.19 | ||||||||||||
2003 | 0.87 | -0.07 | 14.35 | 30.50 | 41.19 | 51.07 | 57.29 | 58.03 | 47.97 | 36.19 | 20.33 | 12.81 | 30.88 | |||||||||||||
2004 | -4.58 | 5.31 | 19.74 | 29.93 | a | 40.16 | 48.50 | 54.90 | 49.77 | 51.97 | 38.77 | 27.33 | 7.03 | 30.74 | ||||||||||||
2005 | -3.87 | 9.29 | 13.97 | 34.87 | 43.19 | 57.10 | 59.32 | 55.68 | 50.53 | 37.39 | 23.97 | 12.45 | 32.82 | |||||||||||||
2006 | 16.45 | 0.61 | 21.39 | 34.63 | 44.42 | 50.73 | 58.45 | 55.23 | 44.03 | 31.57 | a | 23.40 | 16.52 | 33.12 | ||||||||||||
2007 | 4.65 | -2.57 | 20.06 | 27.70 | 44.29 | 54.57 | 56.26 | 53.58 | 45.33 | 41.03 | 24.33 | 3.58 | 31.07 | |||||||||||||
2008 | -2.00 | -1.90 | 9.90 | a | 28.11 | c | 38.19 | 51.23 | 56.52 | 53.84 | 47.32 | b | 36.26 | 24.29 | b | -3.93 | a | 28.15 | ||||||||
2009 | -12.00 | a | 3.96 | 15.52 | 31.21 | a | 41.34 | b | 49.52 | a | 51.90 | 54.00 | 51.52 | a | 32.77 | 29.11 | b | 5.58 | 29.54 | |||||||
2010 | -0.71 | 3.00 | d | 24.97 | 35.77 | 43.90 | 52.83 | 59.13 | 59.81 | 44.97 | 37.71 | 22.86 | a | 4.50 | c | 32.39 | ||||||||||
2011 | -3.10 | a | 2.48 | a | 11.48 | h | 31.90 | 42.19 | 52.53 | 62.03 | b | 57.90 | 45.73 | 39.93 | a | 24.45 | a | 15.55 | 33.78 | a | ||||||
2012 | 7.84 | f | 13.71 | a | 30.16 | 33.70 | 46.61 | 54.07 | b | 62.50 | c | 55.06 | 42.62 | a | 33.10 | a | 21.59 | a | 8.68 | i | 39.31 | b | ||||
2013 | -2.04 | h | 1.82 | 9.87 | 24.29 | p | 41.27 | a | 52.07 | 57.57 | a | 56.06 | 49.93 | c | 37.81 | 19.76 | a | -4.42 | 32.17 | b | ||||||
2014 | -10.58 | g | -8.96 | 5.81 | 27.17 | a | 41.94 | 52.69 | a | 55.97 | a | 56.64 | c | 47.46 | b | 35.52 | d | 14.55 | a | 13.08 | f | 32.88 | b | |||
2015 | 10.78 | h | -6.18 | 18.03 | 31.83 | a | 42.74 | 52.33 | 58.44 | d | 55.39 | 53.70 | 37.28 | b | 30.48 | a | 20.42 | 35.86 | a | |||||||
2016 | 4.65 | 7.62 | 26.52 | 31.43 | 43.03 | 52.89 | c | 58.60 | a | 58.42 | 51.40 | 38.00 | 31.50 | d | 9.35 | 34.45 | ||||||||||
2017 | 5.73 | a | 11.74 | a | 16.16 | 32.63 | 41.68 | c | 51.73 | 56.32 | 53.07 | a | 50.00 | o | ----- | z | 18.17 | f | 5.26 | 30.48 | c | |||||
2018 | -0.13 | -4.82 | 16.39 | 21.00 | c | 46.65 | 53.70 | 59.52 | 57.35 | 50.07 | 33.65 | 16.77 | 14.06 | 30.35 | ||||||||||||
2019 | -5.29 | -4.57 | 10.58 | 30.77 | 39.45 | 52.28 | a | 60.48 | 55.35 | 51.17 | 36.00 | a | 19.90 | 7.77 | 29.49 | |||||||||||
2020 | 5.48 | b | 2.00 | 20.90 | 27.22 | c | 41.97 | a | 54.30 | 60.61 | 58.21 | c | 45.67 | 30.97 | 26.36 | b | 11.97 | b | 32.14 | |||||||
2021 | 8.19 | -4.75 | 23.43 | c | 32.04 | b | 41.45 | b | 55.83 | 57.77 | 59.16 | 49.93 | 42.19 | 24.13 | 9.13 | 33.21 | ||||||||||
2022 | -11.06 | -8.25 | 14.93 | a | 27.72 | a | 45.10 | a | 53.40 | 57.97 | a | 57.41 | b | 49.82 | b | 37.45 | 24.13 | 6.48 | 29.59 | |||||||
2023 | 8.94 | 2.14 | 9.47 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 6.85 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -2.57 | 1.48 | 15.18 | 29.88 | 41.94 | 51.85 | 57.16 | 54.94 | 46.61 | 35.12 | 21.66 | 5.44 | 29.69 | |||||||||||||
S.D. | 7.59 | 7.41 | 6.27 | 3.02 | 3.15 | 2.57 | 2.68 | 2.67 | 3.45 | 3.60 | 4.42 | 7.13 | 2.37 | |||||||||||||
SKEW | 0.12 | 0.49 | 0.06 | -0.36 | -0.25 | -0.28 | -0.11 | 0.02 | -0.08 | -0.16 | -0.25 | -0.15 | 0.21 | |||||||||||||
MAX | 16.45 | 20.88 | 30.16 | 35.77 | 47.72 | 57.92 | 62.50 | 59.94 | 53.70 | 42.35 | 31.50 | 20.42 | 34.45 | |||||||||||||
MIN | -18.59 | -13.68 | 1.42 | 21.00 | 34.65 | 44.03 | 51.45 | 49.77 | 38.00 | 24.90 | 9.93 | -10.34 | 25.79 | |||||||||||||
YRS | 53 | 53 | 52 | 48 | 57 | 58 | 54 | 54 | 55 | 49 | 54 | 55 | 35 |