YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.67 | l | 43.33 | d | 27.63 | 18.37 | 29.78 | i | ||
1952 | 18.69 | b | 14.41 | 24.58 | 39.80 | 50.69 | 58.78 | 62.02 | 61.45 | 55.42 | 46.02 | 28.10 | 17.94 | 39.82 | ||||||||||||
1953 | 21.35 | 21.93 | 34.44 | 39.82 | 46.56 | 56.90 | e | 64.77 | 61.79 | 55.72 | 44.57 | a | 35.95 | 16.31 | 41.68 | |||||||||||
1954 | 22.92 | 33.62 | 32.62 | b | 46.13 | 53.08 | 58.60 | 67.90 | 60.45 | c | 53.65 | 45.78 | a | 35.25 | 12.65 | 43.55 | ||||||||||
1955 | 11.30 | a | 15.80 | ----- | z | ----- | z | 47.46 | e | 57.40 | a | 64.58 | 66.08 | 57.76 | m | 46.50 | 19.00 | r | 16.69 | j | 44.16 | e | ||||
1956 | 26.55 | 15.59 | 28.33 | a | 40.92 | 51.97 | a | 60.43 | 64.39 | 61.21 | 56.53 | 45.16 | 26.64 | a | 17.39 | h | 43.43 | a | ||||||||
1957 | 18.67 | e | 24.69 | a | 32.24 | 38.05 | 48.61 | 58.46 | d | 63.98 | 62.47 | 52.58 | 48.29 | 28.38 | 20.13 | a | 41.38 | |||||||||
1958 | 13.82 | 26.70 | a | 29.13 | 37.93 | 52.95 | 59.57 | 62.73 | 65.35 | 56.60 | 46.35 | 31.77 | 29.85 | k | 43.90 | a | ||||||||||
1959 | 18.17 | a | 22.18 | 31.00 | 41.58 | 51.82 | 61.90 | 65.24 | 62.58 | 54.48 | 44.02 | 32.23 | 19.75 | a | 42.08 | |||||||||||
1960 | 14.53 | 17.79 | 32.18 | 43.05 | 48.87 | 60.18 | 65.50 | 63.21 | 58.34 | b | 45.28 | a | 33.45 | a | 21.25 | k | 43.85 | a | ||||||||
1961 | 13.77 | c | 24.12 | 32.53 | 40.83 | a | 52.37 | 61.80 | 64.55 | 65.35 | a | 51.62 | a | 44.98 | 29.32 | 15.61 | 41.40 | |||||||||
1962 | 12.02 | 20.94 | a | 26.05 | 47.88 | 47.35 | 65.91 | c | 69.57 | a | 63.55 | 55.77 | 47.52 | b | ----- | z | 23.58 | 43.65 | a | |||||||
1963 | 12.97 | 29.02 | 30.55 | 43.68 | 53.50 | 58.03 | 65.58 | 63.77 | ----- | z | ----- | z | 39.48 | b | 22.10 | k | 44.07 | c | ||||||||
1964 | 11.13 | a | 14.86 | 22.74 | 38.65 | 51.69 | ----- | z | ----- | z | 56.32 | t | 55.72 | u | 41.38 | w | 30.71 | a | 21.89 | 27.38 | e | |||||
1965 | 19.32 | 20.41 | 28.27 | 42.02 | 47.60 | 55.53 | 62.44 | 61.45 | a | 52.02 | 46.44 | 35.33 | 20.72 | d | 40.96 | |||||||||||
1966 | 11.15 | a | 13.75 | 30.61 | 41.67 | a | 51.60 | 58.77 | 65.94 | d | 63.21 | 55.68 | 44.65 | 34.75 | 19.95 | 40.98 | ||||||||||
1967 | 21.30 | a | 25.56 | a | 38.32 | 39.85 | 47.47 | 55.86 | a | 65.24 | 62.92 | 55.55 | 45.87 | a | 34.17 | 18.43 | c | 42.54 | ||||||||
1968 | 11.95 | a | 22.57 | 31.72 | a | 36.81 | a | 48.29 | b | 58.23 | f | ----- | z | ----- | z | 51.60 | a | 45.85 | a | 29.25 | 18.76 | 32.98 | c | |||
1969 | 24.66 | 16.88 | 22.79 | 43.13 | 53.16 | 55.12 | a | 65.35 | 65.63 | 56.02 | b | 38.87 | 28.67 | 23.08 | 41.11 | |||||||||||
1970 | 19.81 | 26.91 | 30.32 | 37.72 | 49.29 | b | 56.05 | 63.13 | 64.15 | 52.19 | a | 39.63 | 31.42 | 23.25 | c | 41.15 | ||||||||||
1971 | 22.94 | 26.21 | 32.42 | a | 39.42 | 46.90 | 58.00 | 63.55 | a | 63.52 | 50.35 | d | 41.50 | 30.72 | 16.39 | 40.99 | ||||||||||
1972 | 14.72 | a | 23.93 | 36.52 | a | 41.70 | 46.69 | 58.98 | 62.82 | 62.45 | 54.58 | 44.23 | 27.17 | 12.52 | a | 40.53 | ||||||||||
1973 | 10.56 | 20.50 | 31.97 | 35.57 | 48.68 | 57.23 | b | 61.91 | c | 60.60 | 52.93 | 44.60 | a | 33.38 | a | 17.47 | 39.62 | |||||||||
1974 | 11.61 | 8.84 | 33.83 | a | 37.32 | 52.71 | b | 59.03 | a | 62.97 | 59.55 | 54.71 | a | 45.15 | 29.47 | a | 16.52 | 39.31 | ||||||||
1975 | 9.85 | 15.30 | a | 28.56 | 37.10 | 42.20 | c | 54.40 | 65.65 | 59.06 | 51.59 | a | 40.03 | a | 28.80 | 14.87 | 37.28 | |||||||||
1976 | 11.15 | 21.33 | c | 28.32 | a | 40.70 | 49.15 | 56.50 | 64.97 | a | 60.02 | a | 54.32 | 39.82 | 30.60 | 19.68 | a | 39.71 | ||||||||
1977 | 13.90 | 24.09 | a | 27.93 | a | 42.15 | 46.88 | a | 59.98 | 63.61 | 64.02 | 55.33 | a | 44.17 | b | 29.45 | 27.45 | 41.58 | ||||||||
1978 | 20.93 | a | 20.04 | a | 35.82 | 37.58 | 46.98 | 58.31 | a | 64.97 | 61.93 | a | 54.53 | 45.23 | 34.78 | 8.72 | d | 40.82 | ||||||||
1979 | 10.34 | c | 19.32 | 30.02 | 39.76 | a | 49.39 | 55.85 | 62.95 | 60.93 | c | 56.85 | 46.25 | a | 27.86 | a | 19.55 | a | 39.92 | |||||||
1980 | 24.37 | a | 25.36 | 28.02 | f | 33.05 | h | 47.98 | a | 59.20 | h | 64.53 | 62.31 | 54.69 | a | 43.74 | 32.09 | a | 29.81 | 42.76 | c | |||||
1981 | 20.93 | a | 22.09 | 35.21 | 45.28 | 51.21 | 59.84 | b | 65.53 | 62.73 | 54.92 | 43.53 | 35.25 | h | ----- | z | 46.13 | b | ||||||||
1982 | 16.73 | c | 19.67 | a | 33.48 | c | 39.88 | d | 46.75 | e | 56.81 | a | 63.84 | b | 64.76 | 53.72 | a | 41.65 | a | 29.09 | b | 21.84 | 40.69 | |||
1983 | 21.76 | 25.29 | b | 30.42 | a | 33.36 | b | 47.74 | 57.23 | 62.98 | b | 65.50 | 56.10 | a | 44.63 | a | 31.81 | c | 25.43 | d | 41.85 | |||||
1984 | 8.80 | a | 9.90 | d | 25.70 | a | 37.38 | b | 54.05 | c | 58.15 | f | 66.38 | a | 66.34 | 56.77 | b | 40.79 | 31.59 | b | 19.91 | c | 37.96 | a | ||
1985 | 19.47 | a | 19.98 | a | 37.30 | a | 40.52 | 49.76 | b | 59.38 | a | 65.12 | a | 62.26 | d | 52.03 | 44.19 | 32.95 | 20.95 | b | 41.99 | |||||
1986 | 18.85 | 32.18 | 37.83 | a | 43.47 | 49.32 | 60.66 | a | 62.95 | b | 64.10 | 53.32 | 42.57 | a | 32.52 | 19.98 | 43.15 | |||||||||
1987 | 19.66 | 26.00 | 30.48 | 43.68 | 50.29 | 58.87 | 62.40 | 61.90 | 52.67 | 45.56 | ----- | z | ----- | z | 45.15 | b | ||||||||||
1988 | 13.03 | o | 17.14 | 31.90 | 43.33 | 50.11 | 61.93 | a | 65.39 | 65.03 | 53.27 | 47.09 | b | 31.42 | 17.52 | 44.01 | a | |||||||||
1989 | 6.40 | 20.14 | 36.50 | a | 45.60 | a | 52.48 | 58.37 | 65.18 | 61.83 | b | 55.11 | c | 43.78 | a | 32.63 | c | 17.03 | a | 41.26 | ||||||
1990 | 17.40 | a | 24.93 | ----- | z | 45.45 | 48.92 | a | 60.48 | 64.65 | 61.95 | a | 58.77 | 44.55 | 31.23 | 15.74 | 43.10 | a | ||||||||
1991 | 12.84 | 22.95 | 32.03 | a | 39.13 | 50.29 | 57.95 | a | 63.74 | 63.42 | 55.12 | 44.02 | 30.22 | a | 19.55 | a | 40.94 | |||||||||
1992 | 15.19 | 26.95 | 36.30 | a | 46.62 | 52.79 | 57.38 | a | 61.59 | c | 62.31 | 55.32 | b | 46.77 | 24.95 | a | 17.98 | 42.01 | ||||||||
1993 | 21.05 | 25.66 | 33.13 | a | 42.25 | 51.22 | a | 57.07 | 61.87 | 61.07 | a | 53.98 | a | 43.50 | a | 24.95 | a | 18.34 | 41.17 | |||||||
1994 | 18.73 | 20.91 | a | 36.71 | 43.21 | b | 52.39 | 61.35 | 64.94 | 65.73 | 55.87 | 44.03 | b | 29.27 | b | 20.68 | c | 42.82 | ||||||||
1995 | 22.12 | b | 32.59 | a | 34.24 | b | 40.80 | ----- | z | 55.70 | 61.21 | b | 64.69 | 56.09 | a | 43.92 | 35.58 | 27.17 | a | 43.10 | a | |||||
1996 | 18.76 | b | 21.98 | b | 33.72 | b | 42.36 | a | 53.52 | 60.15 | 65.87 | a | 64.43 | a | 54.14 | a | 43.28 | a | 33.27 | d | 21.47 | 42.75 | ||||
1997 | 19.95 | a | 21.63 | a | 31.62 | c | 40.73 | b | 51.34 | 57.57 | 62.45 | 62.32 | 57.55 | 42.79 | 30.98 | 16.11 | 41.25 | |||||||||
1998 | 23.48 | c | 25.96 | a | 33.30 | a | 39.93 | a | 49.83 | a | 55.53 | 66.16 | 63.34 | 59.52 | 45.53 | 34.02 | a | 21.65 | 43.19 | |||||||
1999 | 26.27 | 28.46 | b | 39.74 | 40.46 | b | 48.68 | 57.22 | 65.05 | a | 62.92 | 54.40 | a | 43.80 | a | 34.05 | 18.38 | a | 43.29 | |||||||
2000 | 24.32 | c | 28.12 | d | 35.65 | 45.78 | 54.02 | a | 59.77 | 65.67 | a | 65.17 | a | 56.27 | 45.24 | b | 24.36 | a | 20.65 | 43.75 | ||||||
2001 | 15.45 | 25.20 | a | 35.77 | a | 44.55 | a | 52.39 | 58.98 | 64.98 | 63.26 | 55.55 | 44.63 | a | 34.55 | a | 15.66 | 42.58 | ||||||||
2002 | 16.68 | 16.46 | b | 28.19 | b | 45.13 | 50.03 | 60.47 | 67.03 | a | 61.00 | d | 55.02 | 41.37 | 31.16 | a | 21.35 | 41.16 | ||||||||
2003 | 22.52 | a | 25.09 | a | 34.43 | c | 42.25 | 51.80 | a | 56.28 | 66.52 | a | 64.08 | 52.98 | 46.88 | a | 31.69 | a | 20.25 | a | 42.90 | |||||
2004 | 11.60 | 18.79 | 37.94 | 43.80 | 50.60 | 57.32 | 62.48 | 60.17 | a | 53.07 | 44.42 | 32.64 | a | 20.79 | 41.13 | |||||||||||
2005 | 27.06 | 28.20 | a | 32.47 | a | 41.39 | c | 52.02 | 56.30 | 65.23 | 63.04 | c | 55.48 | 46.21 | 34.90 | 16.68 | 43.25 | |||||||||
2006 | 17.25 | a | 17.59 | 33.35 | a | 45.42 | 51.22 | b | 60.65 | 66.89 | 63.50 | b | 51.98 | 42.68 | a | 31.27 | b | 22.27 | a | 42.01 | ||||||
2007 | 14.35 | a | 26.84 | 37.02 | 43.98 | a | 51.68 | 60.05 | 67.14 | b | 66.24 | 58.60 | 45.31 | b | 33.79 | a | 17.95 | a | 43.58 | |||||||
2008 | 9.74 | 19.29 | 28.30 | a | 37.82 | 49.03 | b | 57.47 | 64.58 | a | 63.13 | 53.95 | 42.84 | b | 34.81 | a | 21.35 | a | 40.19 | |||||||
2009 | 18.13 | a | 26.54 | a | 34.89 | 40.66 | a | 52.71 | 56.45 | 64.14 | b | 60.42 | 55.60 | 40.67 | a | 31.53 | a | 13.39 | 41.26 | |||||||
2010 | 15.76 | 20.50 | 31.70 | a | 42.43 | 48.26 | 59.35 | 65.42 | a | 63.58 | a | 56.08 | 46.50 | b | 30.83 | a | 29.93 | a | 42.53 | |||||||
2011 | 16.82 | 20.66 | 34.69 | 41.52 | c | 47.57 | a | 57.12 | a | 65.31 | 64.10 | 55.33 | 44.23 | 32.41 | a | 18.34 | b | 41.51 | ||||||||
2012 | 21.71 | b | 22.21 | 34.87 | a | 45.77 | b | 51.22 | b | ----- | z | 63.18 | a | 61.13 | 53.42 | 44.52 | 32.82 | 20.84 | 41.06 | a | ||||||
2013 | 9.42 | 16.93 | 31.15 | 40.05 | 48.84 | 59.05 | 66.74 | 63.06 | 58.12 | 42.90 | 35.13 | 15.40 | 40.57 | |||||||||||||
2014 | 19.48 | a | 29.73 | 35.87 | 41.65 | 49.94 | 57.97 | 66.18 | n | 62.03 | a | 58.20 | 46.73 | 32.40 | 26.35 | 41.85 | a | |||||||||
2015 | 21.71 | 30.86 | 38.26 | 42.14 | a | 49.24 | 60.68 | 63.45 | 63.73 | 57.95 | 49.50 | 31.53 | 21.29 | 44.19 | ||||||||||||
2016 | 15.97 | 21.84 | 36.44 | 43.27 | 50.71 | 61.53 | 64.95 | 62.21 | 56.52 | 48.68 | a | 36.30 | 21.56 | 43.33 | ||||||||||||
2017 | 20.76 | 31.46 | 38.18 | 43.55 | 49.53 | 61.10 | 66.66 | 63.32 | 56.07 | 44.57 | a | 38.29 | a | 25.87 | 44.95 | |||||||||||
2018 | 22.58 | 26.86 | 34.52 | 44.20 | 51.75 | a | 61.07 | 68.15 | 67.06 | e | 58.19 | d | 46.25 | a | 28.95 | 18.97 | 44.04 | |||||||||
2019 | 16.82 | 18.59 | 33.56 | 43.95 | 47.40 | 57.37 | 65.00 | 64.13 | 57.34 | a | 39.94 | 31.45 | 21.82 | 41.45 | ||||||||||||
2020 | 18.32 | 24.31 | 37.32 | 42.93 | 53.37 | 61.15 | 65.27 | 66.12 | a | 55.15 | 44.69 | 35.17 | 16.11 | 43.33 | ||||||||||||
2021 | 17.35 | 25.73 | 34.11 | 43.75 | 51.98 | 62.27 | 68.65 | 63.47 | a | 57.92 | 45.47 | 37.55 | 25.16 | 44.45 | ||||||||||||
2022 | 19.60 | 21.98 | 33.06 | 42.97 | 52.02 | a | 61.27 | 67.13 | 65.21 | 58.95 | 43.90 | 28.08 | 21.11 | 42.94 | ||||||||||||
2023 | 20.68 | 15.34 | 27.28 | a | 40.07 | 51.95 | 55.83 | 66.15 | 65.32 | 55.92 | 45.24 | 34.83 | 25.47 | 42.01 | ||||||||||||
2024 | 23.26 | 28.31 | 36.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.49 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.50 | 22.53 | 32.71 | 41.62 | 50.17 | 58.67 | 64.77 | 63.14 | 55.16 | 44.41 | 31.79 | 19.87 | 41.82 | |||||||||||||
S.D. | 4.86 | 5.20 | 3.81 | 2.87 | 2.32 | 2.17 | 1.75 | 1.80 | 2.06 | 2.15 | 3.12 | 4.00 | 1.46 | |||||||||||||
SKEW | -0.17 | -0.21 | -0.55 | -0.31 | -0.54 | 0.45 | 0.20 | -0.02 | -0.05 | -0.46 | -0.11 | 0.18 | -0.27 | |||||||||||||
MAX | 27.06 | 33.62 | 39.74 | 47.88 | 54.05 | 65.91 | 69.57 | 67.06 | 59.52 | 49.50 | 39.48 | 29.93 | 44.95 | |||||||||||||
MIN | 6.40 | 8.84 | 22.74 | 33.36 | 42.20 | 54.40 | 61.21 | 59.06 | 50.35 | 38.87 | 24.36 | 8.72 | 37.28 | |||||||||||||
YRS | 72 | 73 | 70 | 70 | 71 | 67 | 69 | 70 | 69 | 71 | 69 | 66 | 55 |