YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.13 | 36.57 | a | 22.93 | 17.00 | 30.16 | h | |||
1942 | 1.90 | a | 11.75 | 21.16 | 37.17 | 39.55 | 49.20 | 55.74 | 53.87 | 42.70 | 33.13 | 19.80 | 10.94 | 31.41 | ||||||||||||
1943 | 8.30 | a | 12.39 | 21.19 | 33.50 | 37.58 | 48.07 | 55.61 | 55.61 | 47.57 | 32.76 | j | 17.00 | 15.93 | a | 32.07 | a | |||||||||
1944 | -8.65 | 1.04 | a | 17.20 | a | 30.83 | 46.87 | a | 54.70 | 54.83 | a | 51.10 | 41.07 | 39.48 | 17.20 | ----- | z | 31.42 | a | |||||||
1945 | 12.19 | ----- | z | 33.48 | ----- | z | 34.16 | ----- | z | 57.29 | 57.90 | 43.50 | ----- | z | 23.57 | 5.74 | 33.48 | d | ||||||||
1946 | 1.10 | 19.93 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.17 | g | ----- | z | ----- | z | ----- | z | 10.51 | j | ||
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 | 53.69 | r | 42.10 | a | 29.38 | b | 14.21 | a | 14.84 | 25.13 | h | |
1956 | 15.83 | a | 7.86 | a | 20.03 | b | 32.29 | b | 42.62 | g | 52.13 | 55.87 | a | 50.28 | b | 36.56 | n | 31.71 | 14.17 | a | -3.39 | 27.68 | b | |||
1957 | -4.23 | -2.12 | c | 24.07 | b | 31.79 | a | 40.78 | d | 49.00 | b | 55.64 | f | 53.71 | c | 37.00 | g | 32.15 | d | 18.37 | c | 10.84 | f | 27.06 | c | |
1958 | 4.96 | d | 18.95 | h | 22.22 | d | 26.10 | i | 41.96 | c | 48.65 | j | 50.59 | b | 52.41 | b | 41.65 | d | 29.17 | a | 21.90 | j | 14.35 | e | 32.16 | d |
1959 | 11.79 | c | 17.77 | b | 22.96 | f | 32.54 | f | 41.50 | g | 50.79 | a | 52.60 | a | 51.28 | f | 42.22 | c | 29.74 | d | 15.96 | g | 10.52 | f | 34.15 | f |
1960 | -1.96 | c | -4.21 | a | 19.50 | a | 31.76 | a | 40.14 | b | 46.38 | f | 52.66 | b | 47.00 | b | 44.82 | b | 31.54 | e | 21.00 | d | 5.86 | b | 26.19 | a |
1961 | 1.32 | 12.62 | b | 22.81 | d | 31.41 | a | 40.03 | b | 50.07 | 53.79 | c | 54.63 | a | 38.97 | a | 31.12 | e | 19.32 | e | 6.20 | a | 30.19 | |||
1962 | -7.40 | a | 14.30 | a | 18.37 | a | 37.57 | b | 43.17 | b | 50.29 | b | 54.90 | a | 48.74 | d | 42.78 | c | 32.00 | a | 20.70 | c | 6.15 | d | 30.13 | |
1963 | -6.90 | a | 16.46 | b | 19.54 | c | 30.34 | a | 42.23 | a | 45.75 | f | 52.21 | c | 55.08 | e | 45.25 | b | 33.88 | e | 18.65 | d | 1.52 | b | 28.02 | a |
1964 | 0.47 | a | 5.58 | c | 13.35 | e | 31.83 | a | 40.55 | 47.93 | c | 55.19 | d | 50.86 | b | 40.33 | 28.74 | 12.00 | b | 2.97 | b | 27.48 | ||||
1965 | 0.86 | b | 3.46 | 14.65 | 34.30 | 40.94 | 45.76 | a | 54.19 | 49.58 | 35.63 | 28.55 | 24.68 | b | 15.96 | g | 30.24 | a | ||||||||
1966 | -0.23 | a | 8.21 | 20.07 | b | 30.89 | b | 40.17 | b | 47.43 | 55.07 | a | 49.65 | 43.66 | a | 26.46 | c | 21.07 | -2.07 | b | 28.36 | |||||
1967 | -6.87 | -1.39 | 24.48 | b | 27.57 | b | 38.33 | a | 46.77 | 55.00 | a | 52.29 | 42.87 | 27.48 | 20.00 | b | -3.47 | a | 26.92 | |||||||
1968 | -12.29 | ----- | z | 23.33 | a | 29.14 | a | 40.90 | 50.40 | 56.45 | 51.16 | 39.20 | 31.84 | 20.55 | a | 4.43 | a | 30.47 | a | |||||||
1969 | 13.03 | 11.43 | 16.13 | 34.62 | a | 45.19 | 50.04 | d | 55.53 | a | 55.87 | a | 47.17 | 29.61 | 18.28 | a | 11.57 | c | 32.37 | |||||||
1970 | 4.43 | a | 19.18 | 23.46 | c | 27.19 | d | 42.21 | b | 50.35 | g | 56.64 | f | 57.03 | b | 40.24 | a | 27.27 | i | 23.69 | d | 10.59 | b | 27.56 | c | |
1971 | 9.13 | a | 17.23 | b | 20.76 | b | 31.57 | 40.77 | 50.27 | 56.16 | 56.35 | 39.97 | 30.33 | a | 13.70 | 5.57 | a | 30.98 | ||||||||
1972 | 13.21 | b | 16.34 | 28.55 | b | 34.37 | 42.18 | c | 52.34 | a | 55.97 | 54.39 | 44.11 | c | 38.40 | a | 23.83 | -3.77 | e | 33.33 | ||||||
1973 | -14.43 | a | -2.93 | 22.30 | a | 32.69 | a | 41.80 | a | 49.43 | 55.55 | 53.97 | b | 43.13 | 32.03 | b | 21.29 | b | 0.53 | a | 27.95 | |||||
1974 | -9.00 | a | -8.75 | 26.34 | b | 31.70 | 42.90 | b | 50.87 | 57.21 | c | 50.10 | b | 42.23 | 35.65 | 22.46 | b | 8.34 | b | 29.17 | ||||||
1975 | -0.13 | a | 11.41 | a | 26.59 | b | 28.25 | b | 39.40 | f | 47.17 | 58.13 | 50.00 | a | 42.93 | c | 28.79 | c | 17.14 | a | 6.57 | a | 28.80 | a | ||
1976 | -2.07 | a | 10.39 | a | 20.57 | a | 33.37 | 44.07 | b | 47.87 | 58.42 | 52.13 | a | 46.93 | a | 27.55 | 17.17 | f | 5.55 | b | 31.34 | a | ||||
1977 | 5.81 | 12.35 | b | 21.19 | 35.45 | a | 40.94 | 54.57 | b | 57.39 | 56.07 | a | 45.25 | b | 31.23 | 21.22 | g | 17.79 | b | 34.37 | a | |||||
1978 | 11.00 | a | 10.50 | 28.48 | h | 35.00 | k | 39.64 | i | 48.05 | h | 55.94 | m | 51.36 | f | 41.15 | j | 32.10 | j | 19.28 | l | -7.64 | q | 10.75 | j | |
1979 | -10.50 | a | -2.81 | a | 18.23 | a | 34.92 | e | 44.21 | c | 50.24 | e | 55.11 | d | 53.92 | e | 45.64 | h | 33.96 | f | 13.96 | f | 7.88 | o | 30.42 | d |
1980 | 12.37 | d | 8.35 | c | 24.45 | i | 32.54 | d | 43.07 | a | 47.74 | c | 56.86 | b | 50.86 | b | 44.65 | d | 31.56 | f | 22.00 | j | 18.05 | j | 37.06 | d |
1981 | 12.95 | i | 14.89 | i | 27.81 | d | 36.59 | h | 43.30 | h | 52.73 | o | 55.64 | f | 53.00 | j | 48.58 | f | 36.00 | j | 24.15 | c | 14.77 | e | 22.24 | i |
1982 | 5.04 | e | 11.12 | b | 25.60 | f | 29.28 | e | 39.27 | i | 47.73 | h | 56.52 | h | 56.22 | h | 48.33 | c | 29.38 | o | 20.29 | f | 11.92 | f | 23.44 | h |
1983 | 9.65 | e | 14.52 | c | 29.27 | e | 31.26 | g | 39.73 | i | 50.67 | c | 58.57 | c | 61.52 | h | 48.13 | g | 36.32 | c | 22.00 | d | 5.58 | l | 31.57 | e |
1984 | -11.14 | c | -7.31 | 16.34 | b | 33.27 | 44.61 | c | 50.76 | e | 59.90 | a | 58.42 | e | 46.56 | e | 34.56 | d | 18.71 | f | 2.90 | b | 29.90 | a | ||
1985 | -6.55 | b | -9.26 | a | 20.07 | a | 36.79 | b | 45.03 | a | 51.08 | e | 57.41 | b | 51.43 | c | 42.90 | a | 34.48 | b | 23.86 | a | 10.33 | m | 31.57 | a |
1986 | 1.96 | f | 21.32 | 31.48 | b | 35.57 | 42.24 | b | 54.43 | b | 57.37 | a | 56.58 | 43.75 | b | 33.04 | c | 20.73 | h | 13.95 | l | 41.75 | c | |||
1987 | 5.33 | j | 19.09 | f | 22.26 | d | 32.12 | e | 43.52 | d | 49.08 | e | 52.93 | c | 52.00 | h | 40.86 | a | 33.96 | c | 23.37 | 10.78 | d | 34.32 | c | |
1988 | -4.57 | c | 1.41 | 20.36 | c | 35.27 | d | 39.52 | d | 52.82 | b | 53.92 | e | 52.97 | a | 40.44 | e | 34.33 | d | 23.24 | i | 4.97 | a | 30.13 | a | |
1989 | -8.94 | -1.40 | c | 27.35 | 37.85 | d | 39.97 | a | 48.70 | 57.23 | 53.35 | 44.07 | 32.65 | 20.47 | 8.77 | 30.01 | ||||||||||
1990 | 8.97 | 8.68 | 27.79 | c | 38.33 | 40.65 | 50.43 | 59.35 | 55.87 | 49.63 | 32.35 | 21.07 | -3.19 | 32.49 | ||||||||||||
1991 | -5.57 | c | 5.61 | 25.87 | 32.43 | 43.40 | a | 51.52 | a | 55.90 | 56.87 | 47.96 | d | 31.33 | a | 22.23 | 12.19 | 31.65 | ||||||||
1992 | -0.67 | d | 15.37 | b | 31.48 | 39.10 | 46.87 | 50.87 | 54.50 | a | 54.27 | a | 46.21 | f | 34.86 | j | 21.93 | 4.91 | h | 34.86 | c | |||||
1993 | 5.57 | a | 5.00 | c | 20.61 | 35.07 | a | 45.29 | 49.07 | 50.68 | 52.00 | c | 39.71 | b | 33.81 | 15.59 | a | 9.13 | 30.13 | |||||||
1994 | 13.19 | 15.25 | 26.45 | 37.03 | 45.50 | a | 53.70 | 58.13 | 56.50 | a | ----- | z | 35.55 | 20.47 | 17.00 | 34.43 | a | |||||||||
1995 | 15.55 | 20.89 | 28.10 | b | 32.07 | 41.87 | 49.57 | 54.35 | 56.94 | 46.33 | 29.61 | 21.63 | 12.90 | 34.15 | ||||||||||||
1996 | 6.06 | 14.86 | 25.45 | 32.77 | 44.03 | a | 51.23 | 57.61 | 53.61 | 43.07 | 30.39 | 23.43 | 12.63 | a | 32.93 | |||||||||||
1997 | 5.93 | a | 4.39 | 21.19 | 31.90 | 45.61 | 52.40 | 55.06 | 56.00 | 49.90 | 31.94 | 22.47 | 12.84 | 32.47 | ||||||||||||
1998 | 14.90 | a | 23.32 | 24.42 | 33.53 | 43.79 | c | 49.03 | 60.17 | a | 54.77 | a | 48.31 | d | 34.46 | e | 23.43 | b | 1.63 | d | 34.31 | |||||
1999 | 8.21 | c | 18.65 | b | 24.87 | a | 32.27 | 41.41 | b | 49.34 | a | 57.32 | 55.00 | 42.57 | 26.26 | 18.43 | 9.65 | 32.00 | ||||||||
2000 | 15.10 | 23.62 | 27.65 | 35.73 | 42.81 | 50.27 | 54.06 | 58.39 | 44.38 | a | 35.81 | 17.13 | 12.39 | 34.78 | ||||||||||||
2001 | 6.58 | 16.82 | 30.42 | 36.40 | 44.19 | 50.67 | 56.87 | a | 55.97 | 45.07 | 32.39 | 23.27 | 2.10 | 33.39 | ||||||||||||
2002 | 0.23 | 6.04 | 22.71 | 34.57 | 43.37 | a | 50.60 | 59.48 | 52.10 | 46.70 | 31.13 | 20.17 | 13.10 | 31.68 | ||||||||||||
2003 | 9.74 | 17.39 | 28.42 | 35.17 | 44.61 | 51.77 | 60.29 | 58.71 | 41.70 | 33.77 | 19.24 | a | 13.07 | a | 34.49 | |||||||||||
2004 | -0.58 | 7.52 | 28.81 | 37.30 | 43.77 | 50.67 | 55.45 | 51.87 | 44.87 | 37.13 | 26.90 | 13.58 | 33.11 | |||||||||||||
2005 | 18.87 | 22.39 | 27.26 | 33.70 | 44.39 | 49.13 | 57.03 | 54.32 | 45.00 | 36.83 | a | 23.07 | 11.10 | 35.26 | ||||||||||||
2006 | 14.72 | f | 14.71 | 25.47 | a | 35.93 | 44.77 | 53.87 | 61.90 | 53.77 | 41.97 | a | 35.29 | 23.07 | 9.77 | 36.41 | a | |||||||||
2007 | -11.97 | 14.04 | 28.87 | 37.67 | 44.19 | 53.17 | 60.03 | 56.77 | a | 45.07 | 31.90 | 18.70 | -0.87 | 31.46 | ||||||||||||
2008 | -8.97 | 3.83 | 20.84 | 29.73 | 40.68 | 49.77 | 58.97 | 55.97 | 43.10 | 30.94 | 23.73 | 6.52 | 29.59 | |||||||||||||
2009 | 0.13 | 16.54 | 24.68 | 34.37 | 46.52 | 50.53 | 58.52 | 52.61 | 47.17 | 32.19 | 20.23 | -6.29 | 31.43 | |||||||||||||
2010 | -1.06 | 3.54 | 23.74 | 33.55 | a | 39.42 | 52.93 | 58.42 | 55.23 | 42.33 | 37.13 | 21.93 | 21.68 | 32.40 | ||||||||||||
2011 | -3.74 | -1.39 | 25.26 | 34.30 | 40.74 | 50.20 | 60.26 | 57.23 | 48.30 | 35.13 | 21.53 | ----- | z | 33.44 | a | |||||||||||
2012 | 9.61 | 18.38 | 27.23 | a | 36.97 | a | 44.58 | ----- | z | 59.74 | 57.19 | 46.13 | 33.48 | 22.33 | 10.03 | 33.24 | a | |||||||||
2013 | -12.39 | 1.00 | 23.00 | 33.07 | 44.03 | 51.87 | 61.65 | 56.43 | a | 50.87 | 32.35 | 23.63 | -5.48 | 30.00 | ||||||||||||
2014 | -1.55 | 16.79 | 27.35 | 34.50 | 43.03 | 50.43 | 60.77 | 55.45 | 48.07 | 35.03 | 18.80 | 19.39 | 34.01 | |||||||||||||
2015 | 16.42 | 21.61 | 29.03 | 34.24 | a | 45.32 | 55.87 | 56.26 | 55.90 | 46.33 | 41.45 | 23.13 | 7.94 | 36.13 | ||||||||||||
2016 | 5.45 | 11.52 | 29.48 | 39.07 | 43.77 | 54.07 | 56.90 | 53.19 | 46.80 | 37.65 | 26.57 | 13.35 | 34.82 | |||||||||||||
2017 | 7.03 | 19.57 | 31.55 | 34.10 | 42.35 | 54.86 | a | 61.06 | 56.00 | 48.37 | 29.65 | 23.73 | 11.45 | 34.98 | ||||||||||||
2018 | 13.13 | 17.79 | 27.68 | 36.13 | 45.68 | 52.67 | 60.65 | 55.35 | 45.00 | 36.03 | 17.53 | 12.61 | 35.02 | |||||||||||||
2019 | 4.13 | 1.96 | 24.68 | 37.80 | 41.42 | 51.47 | 60.68 | 57.39 | 48.23 | 25.68 | 22.43 | 18.23 | 32.84 | |||||||||||||
2020 | 4.29 | 14.21 | 30.58 | 34.55 | a | 45.77 | 51.63 | 55.97 | 55.90 | 42.27 | 29.42 | 20.47 | 3.94 | 32.42 | ||||||||||||
2021 | -0.77 | 15.36 | 27.90 | 32.63 | 44.65 | 53.17 | 62.06 | 53.58 | 45.57 | 35.81 | 24.63 | 16.97 | 34.30 | |||||||||||||
2022 | 12.00 | 9.25 | 25.23 | 33.93 | 40.27 | a | 53.63 | 60.90 | 57.10 | 48.47 | 33.16 | 17.83 | 4.87 | 33.05 | ||||||||||||
2023 | 5.68 | -6.96 | 17.61 | 30.83 | 44.03 | 52.17 | 60.26 | 59.26 | 45.87 | 32.77 | 21.17 | 16.00 | a | 31.56 | ||||||||||||
2024 | 16.39 | 21.86 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.12 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 2.89 | 10.09 | 24.21 | 33.76 | 42.65 | 50.84 | 56.97 | 54.32 | 44.35 | 32.67 | 20.82 | 8.40 | 32.08 | |||||||||||||
S.D. | 8.62 | 8.63 | 4.47 | 2.74 | 2.41 | 2.16 | 2.73 | 2.69 | 3.03 | 3.26 | 3.09 | 6.73 | 2.27 | |||||||||||||
SKEW | -0.15 | -0.50 | -0.23 | -0.18 | -0.68 | 0.11 | -0.11 | -0.47 | -0.17 | 0.14 | -0.69 | -0.36 | -0.41 | |||||||||||||
MAX | 18.87 | 23.62 | 33.48 | 39.10 | 46.87 | 55.87 | 62.06 | 59.26 | 50.87 | 41.45 | 26.90 | 21.68 | 36.13 | |||||||||||||
MIN | -14.43 | -9.26 | 13.35 | 27.19 | 34.16 | 45.76 | 50.59 | 47.00 | 35.63 | 25.68 | 12.00 | -6.29 | 26.92 | |||||||||||||
YRS | 70 | 69 | 68 | 66 | 65 | 63 | 67 | 66 | 66 | 65 | 63 | 61 | 41 |