YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.73 | 53.47 | 28.93 | 21.33 | a | 40.12 | h | |||
1957 | 4.21 | b | 15.82 | 27.08 | 41.68 | 52.47 | 61.24 | a | 72.71 | 67.37 | 55.08 | 44.87 | 29.82 | 22.98 | 41.28 | |||||||||||
1958 | 18.48 | 12.36 | 26.89 | 43.02 | 57.92 | 58.95 | 65.29 | 69.95 | 59.85 | 48.92 | 29.67 | 11.06 | 41.86 | |||||||||||||
1959 | 5.12 | b | 8.72 | a | 30.82 | 42.75 | 54.63 | 67.50 | 69.89 | 72.06 | 58.93 | 39.39 | 20.03 | 25.40 | 41.27 | |||||||||||
1960 | 8.17 | m | 11.33 | 13.31 | 40.72 | 54.68 | 60.95 | a | 70.44 | 68.92 | 60.40 | 47.06 | 31.03 | 13.53 | 42.94 | a | ||||||||||
1961 | 9.95 | a | 19.71 | 33.23 | 36.85 | 51.79 | 66.70 | 67.63 | 71.71 | 55.58 | 47.40 | 29.65 | 10.56 | 41.73 | ||||||||||||
1962 | 5.55 | 9.21 | 22.55 | 40.27 | 55.42 | 62.87 | 65.10 | 68.10 | 55.38 | 49.35 | 34.27 | 18.29 | 40.53 | |||||||||||||
1963 | 1.55 | 13.93 | 33.66 | 44.82 | 54.05 | 67.86 | a | 70.44 | 68.02 | 60.77 | 55.60 | 34.18 | 8.60 | 42.79 | ||||||||||||
1964 | 17.16 | 20.28 | 20.58 | 43.75 | 58.03 | 64.55 | a | 72.71 | 65.32 | 56.37 | 47.03 | 28.42 | 7.76 | 41.83 | ||||||||||||
1965 | 4.29 | 10.36 | 15.27 | 40.55 | 55.65 | 63.68 | 68.50 | 67.18 | 47.93 | 49.56 | 30.12 | 23.61 | 39.73 | |||||||||||||
1966 | -0.26 | 10.25 | 32.95 | 36.67 | 52.23 | 65.03 | 74.06 | 64.95 | 60.19 | f | 45.26 | f | 25.53 | a | 16.31 | 37.77 | b | |||||||||
1967 | 13.13 | 7.91 | 30.69 | 42.63 | 49.71 | c | 62.66 | a | 68.02 | 66.77 | 59.92 | 45.69 | 29.05 | 16.92 | 41.09 | |||||||||||
1968 | 10.77 | 11.79 | 36.88 | a | 43.57 | 51.65 | 65.20 | 69.05 | 68.08 | 59.05 | 46.65 | 30.02 | 11.19 | 41.99 | ||||||||||||
1969 | 1.10 | a | 15.11 | 16.71 | 45.12 | 56.82 | 58.08 | 68.35 | 71.45 | 61.43 | 40.76 | 31.40 | 17.58 | 40.33 | ||||||||||||
1970 | 2.15 | 14.72 | a | 21.42 | 39.75 | 55.58 | 67.18 | 71.79 | 70.21 | 60.45 | 45.55 | 25.75 | 12.27 | 40.57 | ||||||||||||
1971 | 2.69 | 13.38 | 28.27 | 45.47 | 53.08 | 67.18 | 64.94 | 69.31 | 58.77 | 47.06 | 28.93 | 12.44 | 40.96 | |||||||||||||
1972 | 4.10 | 7.78 | 24.45 | 40.32 | 57.55 | 65.08 | 67.21 | 68.98 | 56.98 | 42.50 | 26.98 | 7.66 | 39.13 | |||||||||||||
1973 | 13.95 | 19.04 | 35.35 | 41.97 | 54.29 | 65.30 | 69.08 | 72.56 | 56.83 | 52.03 | 27.68 | 12.56 | 43.39 | |||||||||||||
1974 | 6.87 | a | 14.70 | 26.05 | 43.65 | 51.50 | 64.33 | a | 74.31 | 65.21 | 55.15 | 48.89 | 30.05 | 20.25 | a | 41.75 | ||||||||||
1975 | 12.52 | a | 9.80 | 19.68 | 33.02 | 56.03 | 63.78 | 73.89 | 68.13 | 55.73 | 48.37 | 31.03 | 15.42 | 40.62 | ||||||||||||
1976 | 8.94 | 22.60 | 27.06 | 47.65 | 54.27 | 68.35 | 73.26 | 72.55 | 59.67 | 41.26 | 22.57 | 10.18 | 42.36 | |||||||||||||
1977 | -1.39 | 19.61 | 31.37 | 49.83 | 63.45 | 65.58 | 71.26 | 62.40 | 57.72 | 45.98 | 25.22 | 8.69 | 41.64 | |||||||||||||
1978 | -1.90 | 5.25 | 23.94 | 40.83 | 56.79 | 63.80 | 68.10 | a | 68.85 | 63.95 | 46.87 | 24.77 | 9.97 | 39.27 | ||||||||||||
1979 | -2.65 | 2.52 | 22.07 | a | 35.41 | a | 49.87 | 63.58 | 68.39 | 65.13 | 61.33 | 44.16 | 27.82 | 25.90 | 38.63 | |||||||||||
1980 | 12.60 | a | 13.00 | 23.00 | 47.42 | 59.47 | 65.12 | 68.95 | 66.53 | 58.15 | 43.50 | ----- | z | 15.45 | a | 43.02 | a | |||||||||
1981 | 16.76 | 20.95 | 35.02 | 49.38 | 55.22 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.46 | g | ||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.79 | b | 68.14 | b | 56.00 | a | 46.37 | e | 24.19 | n | 21.34 | b | 52.53 | g |
1983 | 18.63 | d | 22.91 | a | 26.60 | b | 36.61 | b | 50.91 | c | 62.78 | 72.83 | a | 74.63 | 58.30 | b | 44.28 | a | 27.12 | -4.85 | a | 40.90 | ||||
1984 | 9.60 | b | 23.17 | b | 22.91 | i | 43.17 | a | 53.47 | a | 64.72 | a | 69.29 | c | 70.40 | 53.70 | 46.30 | a | 29.85 | d | 12.66 | c | 43.30 | a | ||
1985 | 5.74 | b | 11.63 | b | 32.15 | h | 50.12 | b | 61.21 | c | 61.22 | 69.65 | a | 62.08 | a | 54.58 | 44.00 | a | 15.02 | d | 1.79 | c | 39.73 | a | ||
1986 | 14.34 | 10.17 | a | 28.88 | c | 42.46 | c | 55.45 | a | 64.92 | 69.42 | a | 64.27 | c | 55.84 | a | 46.95 | 25.88 | a | 24.03 | 41.88 | |||||
1987 | 20.81 | d | 29.68 | 31.27 | a | 50.52 | 60.21 | 68.07 | 72.65 | 65.43 | a | 59.57 | 41.41 | b | 33.55 | 21.80 | a | 46.25 | ||||||||
1988 | 6.73 | a | 10.67 | 29.42 | 44.73 | 62.37 | a | 73.36 | a | 75.26 | b | 70.13 | a | 58.77 | 42.34 | 28.00 | 17.44 | 43.27 | ||||||||
1989 | 15.13 | d | 3.24 | a | 22.48 | 41.33 | 55.71 | b | 62.16 | b | 73.02 | 68.82 | 58.85 | 45.93 | a | 25.10 | 6.22 | a | 39.83 | |||||||
1990 | 23.81 | 19.14 | 33.16 | 43.57 | a | 53.05 | a | 64.31 | a | 67.75 | a | 68.21 | c | 63.24 | c | 44.53 | a | 33.20 | 10.95 | a | 43.74 | |||||
1991 | 8.98 | 25.06 | b | 30.48 | a | 46.43 | 58.90 | b | 68.20 | 68.23 | a | 68.84 | 57.25 | 43.98 | a | 22.88 | b | 21.61 | 43.40 | |||||||
1992 | 19.69 | 26.38 | c | 33.08 | 40.30 | b | 57.23 | 60.93 | 61.13 | a | 62.85 | 56.98 | 44.13 | a | 24.40 | a | 11.52 | a | 41.55 | |||||||
1993 | 8.12 | a | 9.79 | b | 23.50 | 38.86 | a | 53.56 | 60.15 | 65.04 | c | 66.73 | 53.33 | a | 44.37 | 24.86 | b | 17.14 | b | 38.79 | ||||||
1994 | -3.10 | a | 6.29 | d | 28.95 | 42.64 | a | 58.21 | 65.13 | 65.92 | a | 64.89 | 60.88 | a | 48.05 | 32.95 | a | 20.57 | a | 40.95 | ||||||
1995 | 12.26 | b | 14.46 | d | 28.46 | c | 36.08 | 51.55 | a | 65.52 | 68.82 | a | 71.39 | 57.63 | 42.66 | 23.67 | 15.41 | c | 40.66 | |||||||
1996 | 2.08 | a | 13.17 | 19.30 | a | 38.07 | 50.68 | 64.95 | 65.87 | a | 68.05 | a | 57.12 | 46.73 | 18.52 | a | 5.97 | a | 37.54 | |||||||
1997 | 3.77 | a | 14.39 | a | 22.25 | a | 35.68 | 51.72 | b | 66.65 | 68.34 | 65.50 | a | 61.00 | b | 48.93 | a | 23.71 | a | 21.57 | a | 40.29 | ||||
1998 | 13.38 | c | 27.27 | 23.52 | a | 45.05 | a | 59.47 | a | 61.18 | 70.43 | c | 69.41 | c | 64.97 | a | 47.58 | a | 31.23 | 21.69 | 44.60 | |||||
1999 | 8.23 | 26.44 | a | 31.95 | a | 44.90 | 55.90 | 64.57 | a | 72.23 | e | 67.93 | a | 56.09 | b | 45.43 | b | 39.17 | 23.21 | b | 44.67 | |||||
2000 | 12.91 | b | 24.76 | b | 36.83 | a | 42.37 | 56.68 | a | 61.89 | c | 69.28 | b | 69.92 | 60.73 | b | 49.29 | 23.79 | d | 2.57 | d | 42.59 | ||||
2001 | 15.87 | d | 5.15 | a | 21.62 | b | 42.75 | 56.63 | a | 64.72 | 71.77 | 71.20 | a | 59.78 | 45.53 | a | 41.12 | a | 20.89 | 43.09 | ||||||
2002 | 19.30 | d | 27.31 | b | 18.06 | 41.62 | 51.03 | a | 67.38 | 73.08 | 67.82 | a | 62.18 | 37.91 | c | 30.43 | b | 20.55 | a | 43.06 | ||||||
2003 | 9.92 | a | 10.70 | 27.00 | b | 45.73 | 52.81 | 62.65 | 69.61 | 71.21 | c | 58.87 | 49.77 | a | 25.53 | 21.69 | 42.12 | |||||||||
2004 | 9.43 | b | 16.73 | a | 34.05 | a | 45.12 | 52.97 | 60.10 | 66.37 | a | 62.79 | 63.12 | 47.05 | 34.15 | 21.02 | b | 42.74 | ||||||||
2005 | 10.29 | 22.61 | 30.08 | 46.85 | 52.65 | 67.02 | b | 71.37 | 66.90 | 63.77 | 47.06 | 32.30 | 15.65 | 43.88 | ||||||||||||
2006 | 23.60 | 13.32 | 28.23 | a | 48.62 | 55.98 | 65.03 | 73.92 | 69.65 | 54.97 | 42.27 | 31.47 | 24.52 | 44.30 | ||||||||||||
2007 | 13.69 | 7.62 | 32.40 | 39.17 | 59.26 | 66.75 | 71.15 | 67.89 | 61.38 | 49.35 | 30.67 | 13.21 | 42.71 | |||||||||||||
2008 | 9.85 | 12.43 | 26.03 | 38.85 | 53.37 | 61.25 | 69.39 | 69.18 | 60.82 | 45.92 | a | 31.45 | 8.81 | 40.61 | ||||||||||||
2009 | 5.76 | 15.88 | 26.84 | 42.73 | 55.15 | 62.82 | 65.42 | 65.47 | 62.88 | 39.42 | 39.23 | 10.65 | 41.02 | |||||||||||||
2010 | 9.35 | 12.54 | 34.50 | 50.87 | 55.52 | 65.67 | 70.84 | 72.58 | 57.40 | 49.66 | 31.03 | 10.79 | 43.40 | |||||||||||||
2011 | 5.47 | 10.86 | 21.79 | 40.28 | 54.18 | 65.10 | 75.02 | 69.58 | 59.25 | 50.73 | 32.67 | 24.77 | 42.47 | |||||||||||||
2012 | 20.26 | 23.26 | 44.00 | 48.35 | 59.27 | 67.95 | 77.00 | 69.31 | 60.53 | 44.97 | 32.70 | 16.95 | 47.05 | |||||||||||||
2013 | 11.73 | 14.54 | 19.53 | 31.80 | 54.79 | 64.37 | 69.92 | 69.58 | 65.75 | 44.05 | 29.28 | 7.15 | 40.21 | |||||||||||||
2014 | 6.53 | 6.00 | 25.90 | 41.37 | 56.21 | 65.73 | 68.15 | 68.27 | 60.60 | 49.06 | 20.88 | 20.08 | 40.73 | |||||||||||||
2015 | 16.94 | 10.39 | 34.63 | 46.63 | 53.15 | 65.87 | 70.23 | 67.16 | 65.37 | 49.61 | 36.83 | 21.42 | 44.85 | |||||||||||||
2016 | 14.10 | 21.34 | 37.55 | 44.28 | 57.60 | 68.75 | 70.02 | 68.92 | 60.27 | 48.42 | 38.83 | 12.24 | 45.19 | |||||||||||||
2017 | 12.77 | 25.21 | 29.26 | 44.18 | 54.50 | 64.98 | 71.87 | 64.52 | 61.60 | 46.40 | 29.32 | 15.85 | 43.37 | |||||||||||||
2018 | 13.13 | 8.18 | 24.32 | 32.37 | 62.50 | 69.30 | 69.63 | 68.26 | 60.35 | 40.94 | 22.92 | 21.11 | 41.08 | |||||||||||||
2019 | 7.32 | 2.80 | 21.77 | 41.93 | 51.45 | 66.23 | 70.73 | 65.82 | 62.12 | 40.37 | 27.60 | 16.66 | 39.57 | |||||||||||||
2020 | 12.71 | 16.07 | 32.28 | a | 41.05 | 53.37 | 69.90 | 72.32 | 70.61 | 59.13 | 39.69 | 36.73 | 22.95 | 43.90 | ||||||||||||
2021 | 20.48 | 7.20 | 38.29 | 42.63 | 55.98 | 71.70 | 72.85 | 70.00 | 64.07 | 51.06 | 34.28 | 18.33 | a | 45.57 | ||||||||||||
2022 | 8.76 | 10.84 | 28.19 | 36.25 | 55.39 | 68.92 | 71.05 | 69.42 | 63.53 | 48.24 | 28.33 | 11.44 | 41.70 | |||||||||||||
2023 | 13.26 | 14.93 | 18.35 | 35.62 | 60.87 | 70.58 | 69.00 | 70.76 | 64.80 | 47.02 | 34.88 | 30.13 | 44.18 | |||||||||||||
2024 | 14.10 | 29.62 | 30.77 | 45.37 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.96 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 10.17 | 14.84 | 27.60 | 42.30 | 55.35 | 65.05 | 70.00 | 68.25 | 59.24 | 46.06 | 29.21 | 15.75 | 42.01 | |||||||||||||
S.D. | 6.49 | 6.97 | 6.20 | 4.39 | 3.18 | 3.00 | 2.93 | 2.66 | 3.33 | 3.50 | 5.07 | 6.69 | 1.95 | |||||||||||||
SKEW | -0.03 | 0.39 | -0.00 | -0.26 | 0.50 | 0.15 | -0.26 | -0.27 | -0.40 | -0.06 | -0.10 | -0.44 | 0.27 | |||||||||||||
MAX | 23.81 | 29.68 | 44.00 | 50.87 | 63.45 | 73.36 | 77.00 | 74.63 | 65.75 | 55.60 | 41.12 | 30.13 | 47.05 | |||||||||||||
MIN | -3.10 | 2.52 | 13.31 | 31.80 | 49.71 | 58.08 | 61.13 | 62.08 | 47.93 | 37.91 | 15.02 | -4.85 | 37.54 | |||||||||||||
YRS | 66 | 67 | 65 | 67 | 66 | 65 | 66 | 66 | 66 | 66 | 65 | 67 | 60 |