YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1956 | ----- | z | ----- | z | ----- | z | ----- | z | 41.26 | 44.86 | a | 53.52 | 48.07 | a | 43.53 | 32.00 | a | 14.87 | 6.00 | a | 35.51 | d | ||||
1957 | 0.94 | 11.22 | a | 23.96 | h | 26.80 | 38.59 | b | 46.97 | 53.61 | 52.52 | 41.00 | c | 34.84 | 19.73 | 14.87 | 31.01 | a | ||||||||
1958 | 11.83 | a | 22.46 | 23.23 | 28.57 | 42.52 | 47.40 | 51.03 | 54.60 | a | 44.53 | 31.73 | a | 19.47 | 17.17 | b | 32.88 | |||||||||
1959 | 13.47 | a | 14.67 | a | 18.55 | 29.07 | b | 37.52 | 49.60 | 55.43 | c | 51.90 | a | 42.53 | 26.61 | 17.10 | 11.61 | 30.67 | ||||||||
1960 | 0.39 | 0.61 | a | 27.26 | d | 28.60 | 37.53 | a | 47.52 | a | 55.54 | c | 50.19 | 46.90 | 33.03 | 22.62 | a | 11.39 | 30.13 | |||||||
1961 | 8.67 | a | 17.82 | 22.65 | 27.30 | 37.81 | 50.93 | 54.19 | 54.80 | a | 37.80 | 29.00 | 17.97 | 5.23 | 30.35 | |||||||||||
1962 | -1.48 | 13.25 | 12.61 | 34.79 | a | 37.90 | 47.13 | 51.50 | a | 48.06 | 42.87 | 33.65 | 24.55 | a | 11.38 | b | 29.68 | |||||||||
1963 | 2.00 | b | 21.68 | 20.58 | 26.18 | b | 40.06 | 43.67 | 54.13 | 53.69 | b | 48.48 | e | 38.52 | h | 24.58 | r | 8.67 | d | 31.91 | b | |||||
1964 | 8.07 | b | 9.96 | b | 15.66 | b | 28.56 | c | 39.85 | d | 43.64 | e | 53.74 | d | 49.18 | c | 39.90 | i | 32.41 | b | 13.73 | 8.45 | 27.57 | a | ||
1965 | 5.74 | 7.25 | 14.68 | 32.03 | 36.55 | 44.10 | 52.68 | 50.58 | 37.20 | 34.58 | 28.57 | 12.71 | 29.72 | |||||||||||||
1966 | 4.65 | 5.93 | 21.19 | 27.10 | 41.38 | b | 50.06 | n | 56.95 | i | 52.18 | n | 46.62 | i | 32.09 | i | 25.90 | j | 3.71 | g | 20.05 | g | ||||
1967 | 6.41 | b | 7.04 | b | 22.88 | f | 29.16 | e | 38.52 | 45.21 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.27 | g | |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | 37.38 | o | 45.67 | c | 52.87 | 47.61 | 38.40 | 31.13 | 19.87 | 7.58 | 34.73 | e | ||||||
1969 | 13.94 | 8.79 | 13.06 | 29.93 | a | 41.81 | 43.87 | 52.16 | 52.43 | c | 44.62 | a | 27.45 | 17.83 | 13.06 | 29.91 | ||||||||||
1970 | 6.06 | 20.14 | 20.23 | 22.53 | 38.52 | 46.90 | a | 52.63 | a | 53.94 | 37.83 | 27.10 | 23.03 | 11.52 | 30.04 | |||||||||||
1971 | 10.97 | 17.36 | 19.19 | 27.83 | 37.80 | a | 47.30 | 52.16 | 54.29 | 38.37 | 30.03 | b | 14.57 | 6.97 | 29.74 | |||||||||||
1972 | 13.03 | a | 16.38 | 25.90 | 30.70 | 39.81 | 48.79 | b | 52.19 | 51.29 | c | 41.97 | 36.45 | 21.03 | 0.93 | b | 31.54 | |||||||||
1973 | -6.71 | -1.39 | 18.74 | 28.33 | 37.37 | a | 46.27 | 52.74 | 51.65 | 39.93 | 33.19 | 22.76 | a | 9.77 | 27.72 | |||||||||||
1974 | -4.42 | 1.46 | 26.26 | 26.38 | a | 39.84 | 48.70 | 52.97 | 50.16 | 40.43 | 36.13 | 23.03 | a | 10.40 | a | 29.28 | ||||||||||
1975 | 7.93 | a | 10.39 | 23.58 | 27.03 | 36.32 | 43.77 | 55.77 | 50.03 | 44.31 | a | 32.84 | 17.03 | 10.19 | 29.93 | |||||||||||
1976 | 6.39 | 13.34 | 18.61 | 32.45 | a | 42.35 | 45.20 | 56.55 | 51.13 | 45.77 | 29.90 | 20.93 | 11.07 | a | 31.14 | |||||||||||
1977 | 9.03 | 17.39 | 19.42 | 33.77 | 37.97 | 51.63 | 55.10 | 53.35 | 45.73 | 33.50 | a | 21.70 | 16.03 | a | 32.89 | |||||||||||
1978 | 9.26 | 8.82 | 26.19 | 33.67 | 37.13 | 46.67 | 53.13 | 50.52 | 42.60 | 32.63 | a | 15.40 | -3.45 | 29.38 | ||||||||||||
1979 | -4.77 | 2.64 | 19.74 | 30.03 | 38.93 | a | 45.87 | 53.06 | 52.26 | 45.73 | 33.19 | 14.34 | a | 11.84 | 28.57 | |||||||||||
1980 | 11.58 | 11.41 | 22.06 | 30.60 | 39.74 | 46.43 | 54.16 | 49.58 | 43.77 | 31.94 | 22.00 | 20.13 | 31.95 | |||||||||||||
1981 | 16.29 | 16.75 | 25.10 | 33.40 | 39.47 | a | 49.85 | c | 54.00 | a | 52.26 | 46.62 | d | 33.16 | 23.83 | a | 16.13 | 33.90 | ||||||||
1982 | 5.19 | 10.70 | a | 23.29 | 26.77 | 36.97 | a | ----- | z | 52.30 | d | 55.50 | a | 47.17 | 31.58 | 21.73 | 13.16 | 29.49 | a | |||||||
1983 | 13.00 | 17.54 | 27.33 | a | 27.57 | 37.45 | 47.50 | 55.81 | 58.30 | a | 47.97 | 35.90 | b | 20.56 | c | 8.61 | c | 33.13 | ||||||||
1984 | -3.34 | b | 3.66 | 20.58 | 28.04 | c | ----- | z | 46.24 | e | 56.45 | k | 55.40 | a | 44.68 | b | 28.82 | c | 21.04 | d | 10.66 | b | 25.58 | b | ||
1985 | 2.77 | a | 2.60 | c | 22.53 | a | 35.57 | 42.90 | 48.41 | h | 59.36 | f | ----- | z | 37.00 | k | 31.16 | f | 21.59 | a | 7.22 | d | 19.31 | e | ||
1986 | 10.77 | ----- | z | 29.90 | 32.76 | a | 38.90 | b | 52.53 | 55.31 | r | 54.69 | b | 41.15 | c | 33.97 | 22.23 | 14.10 | j | 35.21 | c | |||||
1987 | 12.62 | e | 21.27 | f | 24.26 | 34.59 | a | 43.10 | b | 51.48 | c | 53.40 | k | 51.94 | 44.04 | f | 37.65 | 24.37 | c | 12.24 | f | 35.00 | d | |||
1988 | 3.19 | 11.63 | b | 21.74 | 32.19 | d | 39.97 | a | 53.67 | 57.58 | l | 54.96 | g | 42.15 | d | 39.97 | 23.13 | 9.26 | h | 29.74 | c | |||||
1989 | 4.13 | 6.39 | 26.48 | d | 37.17 | g | 40.65 | h | 49.03 | a | 58.38 | g | 52.93 | d | 46.29 | f | 35.34 | b | 24.53 | 13.97 | 26.60 | d | ||||
1990 | 15.45 | 12.79 | 28.33 | a | 37.13 | 40.39 | 51.13 | 56.04 | c | 53.68 | 50.07 | a | 34.45 | 23.17 | 3.81 | 33.87 | ||||||||||
1991 | 4.81 | 17.32 | 23.71 | 29.27 | 39.13 | a | 46.93 | 53.58 | 53.17 | a | 43.50 | 31.42 | 21.47 | 11.65 | 31.33 | |||||||||||
1992 | 7.65 | 20.66 | 29.17 | a | 34.93 | a | 43.50 | a | 47.86 | a | 50.55 | b | 51.42 | 42.77 | 35.67 | a | 18.63 | 6.34 | b | 32.43 | ||||||
1993 | 6.90 | 8.82 | 23.55 | 30.10 | 41.23 | 44.82 | b | 47.97 | b | 50.10 | 40.73 | 37.55 | k | 16.36 | b | 14.48 | 29.55 | a | ||||||||
1994 | 14.47 | a | 14.93 | 26.13 | 31.47 | 42.37 | a | 50.17 | 54.10 | 55.39 | 45.30 | 33.65 | 18.21 | a | ----- | z | 35.11 | a | ||||||||
1995 | 17.29 | 23.89 | 27.32 | 30.50 | 38.00 | a | 44.30 | 51.45 | 53.68 | 45.57 | 29.93 | a | 24.00 | 17.68 | 33.63 | |||||||||||
1996 | 10.81 | 17.21 | 24.97 | b | 30.59 | a | 41.94 | 49.28 | a | 55.42 | 51.03 | 41.47 | 31.10 | 23.17 | 14.94 | 32.66 | ||||||||||
1997 | 9.87 | 11.52 | a | 22.52 | 28.97 | 41.68 | 49.53 | 52.26 | 53.87 | 47.13 | 31.32 | 20.60 | 7.45 | 31.39 | ||||||||||||
1998 | 16.16 | 21.86 | 24.13 | 30.53 | 40.32 | 43.87 | 56.65 | 54.07 | a | 48.90 | 33.03 | 25.00 | 8.39 | 33.58 | ||||||||||||
1999 | 16.33 | a | 19.96 | 28.42 | 30.57 | 38.70 | a | 47.03 | 54.53 | a | 53.20 | a | 42.50 | 31.97 | 25.03 | a | 14.45 | 33.56 | ||||||||
2000 | 19.97 | 23.59 | 27.03 | 35.77 | 42.90 | 47.43 | 57.68 | 58.03 | 44.97 | a | 35.39 | 16.38 | a | 14.23 | 35.28 | |||||||||||
2001 | 11.55 | 19.52 | a | 29.77 | 33.23 | 42.81 | 51.03 | 57.13 | 55.87 | 46.70 | 34.93 | a | 25.93 | 5.97 | a | 34.54 | ||||||||||
2002 | ----- | z | 13.07 | a | 20.16 | 31.93 | 36.76 | b | 51.57 | 63.06 | 53.52 | j | 45.70 | 32.55 | 20.43 | 9.29 | 32.45 | b | ||||||||
2003 | 11.71 | 15.81 | a | 29.07 | a | ----- | z | 42.10 | 48.76 | e | 58.22 | h | 55.81 | d | 41.83 | a | 36.97 | a | 18.90 | 15.71 | 31.67 | b | ||||
2004 | 4.40 | a | 10.71 | a | 28.29 | 32.87 | 39.52 | 48.27 | 53.35 | 50.35 | 42.73 | 35.61 | 23.00 | 14.71 | 31.98 | |||||||||||
2005 | 17.26 | 18.75 | 25.58 | 30.53 | 41.33 | a | 44.87 | 55.26 | 51.23 | 42.55 | a | 35.55 | 22.21 | a | 12.97 | 33.17 | ||||||||||
2006 | 13.03 | 15.21 | 22.71 | 31.55 | a | 40.87 | a | 50.17 | 57.74 | 51.11 | c | 40.90 | a | 33.37 | a | 22.50 | 10.39 | 32.46 | ||||||||
2007 | -1.23 | 17.75 | 27.13 | a | 31.77 | 41.97 | 50.23 | 58.68 | 55.29 | 44.17 | 31.10 | 22.90 | 3.87 | 31.97 | ||||||||||||
2008 | 0.61 | 9.79 | 19.63 | a | 27.00 | 37.20 | a | 46.17 | a | 56.39 | 53.39 | 43.07 | 33.03 | a | 25.13 | 9.67 | a | 30.09 | ||||||||
2009 | 8.87 | 19.36 | 22.87 | 29.79 | a | 42.67 | d | 45.88 | d | 56.00 | 50.45 | b | ----- | z | 30.27 | a | 21.27 | 0.30 | a | 29.79 | a | |||||
2010 | 5.83 | a | 8.07 | 23.50 | a | 31.70 | 35.97 | 49.63 | 54.87 | a | 51.03 | 42.53 | 36.16 | 20.48 | a | 18.55 | 31.53 | |||||||||
2011 | 1.74 | 4.96 | ----- | z | 28.57 | 36.03 | b | 45.60 | 55.48 | 54.42 | 46.90 | 33.27 | a | 19.83 | 11.03 | a | 30.71 | a | ||||||||
2012 | 12.81 | 17.79 | 26.94 | 32.86 | b | 42.00 | 50.03 | 57.13 | 55.67 | a | 47.14 | a | 33.84 | 26.65 | d | 11.45 | 34.53 | |||||||||
2013 | -2.84 | 8.36 | 23.93 | a | 29.59 | a | 40.48 | 51.23 | 59.45 | 54.71 | 48.60 | 31.97 | 23.07 | 2.74 | 30.94 | |||||||||||
2014 | 11.06 | 19.68 | 24.73 | a | 31.17 | a | 37.84 | l | 48.70 | c | 57.97 | 53.32 | 46.97 | 36.16 | 21.63 | 20.29 | 33.79 | a | ||||||||
2015 | 17.81 | 22.59 | a | 29.97 | 31.60 | 40.94 | 53.30 | 52.45 | 53.55 | 47.20 | 40.58 | 20.53 | 8.03 | 34.88 | ||||||||||||
2016 | 7.68 | 15.21 | a | 25.26 | 33.58 | f | 40.17 | g | 53.50 | 54.29 | 51.48 | 45.00 | 36.77 | 27.03 | 13.35 | 32.96 | b | |||||||||
2017 | 7.26 | 21.00 | 29.55 | 31.30 | 40.10 | 50.70 | 57.84 | 54.71 | 45.80 | 29.74 | 26.17 | 15.55 | 34.14 | |||||||||||||
2018 | 16.81 | 17.00 | 24.23 | 29.90 | 42.70 | d | 51.53 | 58.22 | h | 54.00 | f | 46.62 | a | 34.83 | a | 19.40 | 12.42 | 29.54 | b | |||||||
2019 | 6.84 | 8.14 | 24.10 | 34.87 | 37.58 | 47.03 | 56.21 | c | 54.29 | 46.50 | 24.35 | 23.50 | 15.77 | 31.60 | ||||||||||||
2020 | 9.84 | 13.66 | 26.48 | 29.87 | 41.71 | 48.38 | d | 55.81 | d | 56.65 | 44.27 | 31.94 | 22.30 | 9.16 | 32.51 | |||||||||||
2021 | 9.84 | 16.21 | 25.62 | b | 28.90 | 41.42 | 52.57 | b | 60.10 | 53.94 | 47.03 | 35.10 | 27.17 | a | 16.06 | 34.50 | ||||||||||
2022 | 15.52 | 12.57 | 26.06 | 30.13 | 37.55 | 50.50 | 58.58 | 56.52 | 49.83 | 34.71 | 17.93 | 9.61 | 33.29 | |||||||||||||
2023 | 9.42 | 6.89 | 17.94 | 29.90 | 44.55 | 47.50 | 57.87 | 55.74 | 46.66 | a | 35.55 | 24.63 | 17.10 | 32.81 | ||||||||||||
2024 | 15.84 | 21.72 | 24.65 | 31.29 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.74 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.32 | 13.45 | 23.66 | 30.49 | 39.88 | 48.12 | 54.81 | 52.90 | 44.19 | 33.11 | 21.38 | 10.98 | 31.89 | |||||||||||||
S.D. | 6.22 | 6.23 | 4.05 | 2.75 | 2.20 | 2.72 | 2.65 | 2.40 | 3.08 | 3.00 | 3.34 | 4.80 | 1.86 | |||||||||||||
SKEW | -0.43 | -0.35 | -0.68 | 0.03 | 0.01 | 0.16 | 0.40 | -0.07 | -0.35 | -0.30 | -0.33 | -0.53 | -0.15 | |||||||||||||
MAX | 19.97 | 23.89 | 29.97 | 37.13 | 44.55 | 53.67 | 63.06 | 58.30 | 50.07 | 40.58 | 28.57 | 20.29 | 35.28 | |||||||||||||
MIN | -6.71 | -1.39 | 12.61 | 22.53 | 35.97 | 43.64 | 47.97 | 47.61 | 37.20 | 24.35 | 13.73 | -3.45 | 27.72 | |||||||||||||
YRS | 66 | 65 | 64 | 63 | 63 | 65 | 58 | 62 | 61 | 63 | 65 | 62 | 45 |