YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.60 | 26.60 | k | |
1958 | 18.44 | 31.57 | 29.95 | 39.29 | a | 54.71 | 62.92 | 65.15 | d | 67.82 | 58.88 | 48.08 | 34.52 | 30.84 | 45.18 | |||||||||||
1959 | 24.02 | 24.68 | 31.97 | 42.57 | 49.08 | a | 63.32 | 68.16 | 65.26 | 55.28 | 44.47 | 33.45 | 27.82 | 44.17 | ||||||||||||
1960 | 19.90 | 17.38 | 33.89 | 45.50 | 51.74 | 62.88 | a | 68.71 | 66.21 | 60.80 | 46.40 | 34.88 | b | 22.03 | 44.19 | |||||||||||
1961 | 22.67 | a | 30.38 | 33.50 | 42.37 | 53.29 | 65.23 | 68.98 | 67.24 | 52.98 | a | 43.94 | 28.88 | a | 23.68 | a | 44.43 | |||||||||
1962 | 14.34 | 27.23 | 26.50 | 46.83 | 52.79 | 62.00 | a | 68.05 | 66.07 | a | 59.20 | 49.15 | a | 38.84 | a | 25.34 | 44.70 | |||||||||
1963 | 15.64 | c | 33.30 | 32.70 | c | 40.70 | b | 55.89 | 60.71 | a | 70.58 | 68.43 | a | 61.88 | 52.77 | 35.95 | 23.52 | a | 46.01 | |||||||
1964 | 19.31 | d | 20.70 | b | 25.95 | 40.60 | 51.11 | 57.42 | 70.77 | 64.77 | 57.63 | 48.52 | 31.07 | 22.55 | b | 42.53 | ||||||||||
1965 | 26.50 | 26.12 | 26.34 | 43.70 | 49.58 | a | ----- | z | 66.37 | 63.76 | 50.35 | 49.48 | a | 37.78 | a | 25.57 | a | 42.32 | a | |||||||
1966 | 22.45 | 22.25 | 34.84 | 41.95 | 54.94 | 60.23 | 70.48 | 65.05 | 59.43 | 43.45 | 36.58 | 21.50 | 44.43 | |||||||||||||
1967 | 24.74 | 26.71 | 36.55 | 41.62 | 49.00 | 56.97 | 67.29 | 66.66 | 58.78 | 48.08 | 36.03 | 18.73 | 44.26 | |||||||||||||
1968 | 19.82 | 26.66 | 36.03 | 37.30 | 49.35 | 60.75 | 67.13 | 60.37 | 55.57 | 46.73 | 31.52 | 22.55 | 42.81 | |||||||||||||
1969 | 28.32 | 22.96 | 24.39 | 44.07 | 56.74 | 57.05 | 68.58 | 69.25 | a | 60.10 | 38.62 | a | 32.97 | 26.71 | 44.15 | |||||||||||
1970 | 25.85 | a | 32.12 | b | 29.97 | 36.35 | 51.50 | 58.08 | 67.23 | 68.55 | 53.28 | a | 39.83 | a | 35.95 | 22.18 | a | 43.41 | ||||||||
1971 | 25.21 | 27.16 | 30.52 | 40.80 | 48.94 | 59.75 | 67.10 | 68.53 | 51.38 | 41.89 | 25.05 | 18.79 | b | 42.09 | ||||||||||||
1972 | 22.47 | 27.90 | 39.45 | 42.78 | 51.60 | 61.52 | 66.34 | 66.10 | 56.12 | 46.26 | 31.63 | 20.05 | 44.35 | |||||||||||||
1973 | 13.40 | 18.89 | 29.16 | 37.17 | 50.87 | 60.10 | 65.32 | 66.42 | 54.85 | 48.10 | 32.10 | 24.95 | 41.78 | |||||||||||||
1974 | 17.89 | 23.98 | 37.55 | 41.85 | 52.81 | 62.87 | 68.15 | 64.55 | a | 56.13 | 47.34 | 34.70 | 23.52 | 44.28 | ||||||||||||
1975 | 21.69 | 27.71 | 32.58 | 36.70 | 46.69 | 54.85 | 67.48 | 62.63 | 55.92 | 46.68 | c | 30.20 | 25.76 | 42.41 | ||||||||||||
1976 | 24.39 | 28.48 | 30.87 | 43.27 | 53.13 | 58.28 | 69.16 | 64.79 | 57.65 | 44.06 | 34.12 | 25.05 | 44.44 | |||||||||||||
1977 | 23.34 | 30.46 | 30.40 | 44.79 | a | 49.66 | 65.75 | 67.60 | 65.23 | 57.63 | 47.16 | 35.43 | 29.97 | 45.62 | ||||||||||||
1978 | 27.16 | 28.80 | 37.18 | 44.07 | 49.44 | 60.48 | 68.47 | 63.77 | 55.73 | 47.68 | 29.63 | 16.85 | 44.11 | |||||||||||||
1979 | 10.92 | 24.02 | 34.48 | 42.13 | 50.73 | 60.08 | 67.61 | 64.34 | 60.42 | 47.34 | 25.68 | 24.39 | 42.68 | |||||||||||||
1980 | 21.39 | 26.98 | 31.10 | 41.17 | 50.10 | b | 60.57 | 68.27 | a | 64.58 | 57.98 | 45.94 | 34.63 | 33.44 | 44.68 | |||||||||||
1981 | 28.40 | 31.00 | 36.27 | 47.03 | 51.02 | 62.67 | 68.55 | 67.29 | 60.83 | 44.71 | 36.03 | 29.32 | 46.93 | |||||||||||||
1982 | 22.85 | 23.02 | a | 34.27 | 38.07 | 50.90 | 58.30 | 66.95 | a | 67.88 | b | 56.09 | b | 42.65 | 28.41 | b | 22.65 | 42.67 | ||||||||
1983 | 27.00 | 28.34 | 34.61 | 36.57 | 47.16 | 58.09 | b | 66.24 | b | 68.44 | 59.19 | a | 46.69 | 32.42 | 18.32 | 43.59 | ||||||||||
1984 | 16.48 | b | 21.21 | 30.85 | 38.28 | 53.39 | c | 57.33 | a | 68.27 | a | 65.78 | a | 56.36 | b | 40.65 | 33.02 | 22.25 | a | 41.99 | ||||||
1985 | 16.92 | 20.30 | 31.45 | 45.11 | b | 53.77 | a | 61.36 | a | 67.06 | 66.00 | b | 52.00 | e | 45.82 | a | 30.80 | b | 25.03 | a | 42.97 | |||||
1986 | 27.58 | a | 31.86 | 40.76 | 43.46 | b | 50.93 | b | 63.93 | c | 65.22 | a | 66.03 | b | 53.77 | f | 44.04 | d | 34.60 | a | 23.27 | 44.70 | a | |||
1987 | 19.53 | a | 27.89 | a | 31.25 | a | 46.39 | b | 51.88 | b | 62.22 | 66.18 | 61.97 | a | 56.77 | 47.80 | d | 32.98 | 23.94 | 44.07 | ||||||
1988 | 19.62 | a | 27.20 | a | 32.93 | a | 44.68 | b | 53.38 | c | 66.32 | 70.43 | a | 65.56 | 56.70 | 51.18 | 33.59 | a | 21.35 | 45.24 | ||||||
1989 | 19.91 | b | 17.71 | 39.32 | 49.16 | b | 52.09 | b | 59.20 | b | 70.69 | 64.50 | g | 55.09 | g | 44.19 | d | 35.29 | b | 24.17 | d | 41.17 | b | |||
1990 | 26.07 | c | 25.04 | 36.90 | b | 46.15 | 49.66 | 61.68 | b | 68.81 | b | 65.10 | 61.58 | e | 47.59 | d | 34.61 | b | 17.24 | 45.04 | ||||||
1991 | 19.57 | c | 28.44 | b | 34.59 | c | 40.17 | g | 50.74 | f | 60.24 | e | 66.18 | c | 64.90 | b | 56.15 | f | 44.60 | g | 30.26 | g | 18.65 | d | 41.80 | e |
1992 | 20.50 | f | 30.65 | f | 38.45 | c | 48.18 | e | 54.48 | e | 59.40 | i | 64.10 | e | 64.72 | d | 56.66 | e | 48.50 | h | 27.76 | c | 20.90 | f | 50.62 | e |
1993 | 18.16 | i | 16.06 | d | 35.62 | e | 40.42 | d | 53.29 | e | 57.09 | g | 61.56 | f | 62.90 | j | 54.85 | g | 43.60 | g | 28.04 | e | 23.86 | f | 34.69 | g |
1994 | 26.77 | i | 23.02 | e | 36.91 | h | 44.25 | b | 55.25 | e | 64.74 | c | 67.44 | d | 68.55 | b | 59.02 | f | 44.80 | c | 28.91 | c | 26.02 | c | 47.00 | c |
1995 | 24.60 | 32.58 | b | 36.71 | 40.80 | 46.29 | b | 57.42 | 65.02 | ----- | z | 57.83 | a | 44.15 | e | 38.71 | f | 29.17 | e | 43.46 | b | |||||
1996 | 22.80 | i | 27.98 | h | 33.76 | b | 42.56 | f | 50.21 | g | 62.26 | e | 68.83 | b | 65.39 | d | 52.85 | f | 42.86 | i | 34.96 | f | 28.24 | d | 51.70 | g |
1997 | 25.00 | e | 22.71 | d | 33.98 | b | 38.14 | h | 52.95 | c | 61.28 | c | 64.13 | e | 65.33 | d | 58.33 | c | 44.04 | d | 32.40 | f | 21.42 | g | 47.53 | c |
1998 | 29.00 | d | 29.10 | b | 31.50 | g | 40.07 | 52.04 | d | 55.28 | c | 68.89 | d | 67.29 | b | 61.72 | a | 45.62 | c | 34.24 | i | 25.20 | i | 49.89 | c | |
1999 | 32.58 | g | 29.91 | 38.17 | b | 41.41 | c | 49.70 | c | 60.47 | 68.77 | i | 66.98 | e | 53.75 | b | 47.18 | l | 38.22 | g | 29.17 | e | 46.19 | d | ||
2000 | 30.56 | d | 32.11 | b | 35.63 | d | 45.67 | d | 56.21 | c | 61.79 | a | 68.33 | a | 69.90 | a | 56.27 | b | 46.08 | f | 20.29 | f | 25.06 | d | 48.15 | b |
2001 | 19.87 | d | 24.74 | c | 35.10 | a | 44.15 | 55.10 | b | 61.45 | a | 70.31 | b | 69.02 | a | 59.92 | 46.48 | e | 35.59 | b | 22.33 | b | 45.34 | |||
2002 | 21.82 | c | 24.80 | c | 30.83 | b | 44.58 | d | 52.46 | c | 62.63 | c | 73.30 | a | 69.00 | a | 59.52 | b | 42.98 | b | 32.43 | c | 28.83 | b | 45.26 | |
2003 | 32.74 | d | 26.62 | c | 37.00 | c | 44.94 | e | 53.34 | b | 60.16 | a | 73.70 | a | 70.71 | e | 58.00 | e | 53.35 | d | 28.78 | c | 26.50 | b | 47.15 | |
2004 | 20.55 | b | 23.09 | b | 40.02 | 46.66 | a | 54.00 | b | 61.41 | c | 67.73 | a | 64.90 | 55.88 | d | 46.07 | c | 32.86 | b | 28.61 | 45.15 | ||||
2005 | 29.39 | 27.54 | 36.29 | 42.67 | 52.37 | 59.43 | 70.08 | 65.64 | b | 56.42 | 47.90 | b | 34.68 | 23.55 | 45.50 | |||||||||||
2006 | 28.60 | 25.77 | 33.45 | 45.41 | n | 54.98 | c | 65.43 | 72.53 | 66.74 | 54.63 | 44.15 | 35.43 | 23.82 | a | 45.96 | a | |||||||||
2007 | 12.52 | c | 29.30 | 39.19 | 45.52 | 52.69 | 64.60 | 73.35 | 69.97 | 59.20 | b | 48.26 | 38.38 | 21.29 | b | 46.19 | ||||||||||
2008 | 18.27 | a | 26.25 | c | 31.17 | a | 38.35 | 49.50 | a | 59.41 | a | 70.88 | a | 68.52 | 57.05 | 46.32 | 38.80 | 25.13 | a | 44.14 | ||||||
2009 | 27.82 | 30.21 | 36.47 | 41.47 | 53.73 | 57.75 | 68.29 | 64.06 | 61.35 | 42.52 | a | 35.85 | 19.58 | 44.92 | ||||||||||||
2010 | 25.15 | 25.59 | 35.98 | 41.97 | 47.89 | 63.12 | 68.60 | 68.65 | 61.18 | 50.52 | 32.68 | 28.81 | 45.84 | |||||||||||||
2011 | 24.32 | 26.11 | 36.08 | 40.80 | 47.53 | 60.07 | 67.82 | 68.53 | 60.45 | 48.26 | 33.80 | 20.92 | 44.56 | |||||||||||||
2012 | 28.06 | 26.72 | 40.82 | 47.68 | 55.92 | 67.33 | 72.98 | 71.16 | 60.77 | 48.43 | b | 39.43 | 24.69 | 48.67 | ||||||||||||
2013 | 17.40 | 26.04 | 35.98 | 39.88 | 53.43 | a | 66.12 | 71.89 | 69.58 | 61.57 | 44.02 | 33.45 | 21.45 | 45.07 | ||||||||||||
2014 | 28.81 | 30.57 | 39.08 | 43.75 | 54.27 | 60.75 | 70.22 | a | 65.44 | 59.62 | 48.70 | a | 32.57 | g | 35.60 | u | 50.12 | b | ||||||||
2015 | 32.00 | g | 32.80 | 41.37 | a | 45.20 | g | 49.59 | h | 67.96 | g | 67.05 | 67.18 | 61.52 | 52.77 | 29.12 | 21.68 | 46.69 | d | |||||||
2016 | 21.93 | a | 28.83 | 38.94 | 43.78 | 47.92 | k | 63.36 | b | 70.27 | 67.81 | 58.75 | 49.92 | 39.38 | a | 23.08 | 46.00 | a | ||||||||
2017 | 18.56 | 31.48 | 40.29 | 42.70 | 52.32 | 65.00 | 70.94 | 65.94 | 57.88 | 43.23 | 37.07 | 28.53 | 46.16 | |||||||||||||
2018 | 28.60 | 28.20 | 37.42 | 45.08 | 55.65 | 66.40 | 73.46 | h | 68.48 | 61.82 | 45.52 | 32.15 | ----- | z | 46.93 | b | ||||||||||
2019 | 20.89 | 22.77 | 30.56 | 46.24 | e | 48.65 | 61.83 | c | 70.05 | 69.21 | 59.57 | 40.18 | a | 34.73 | 24.11 | 44.07 | ||||||||||
2020 | 25.10 | a | 24.90 | 36.32 | a | 42.93 | 53.95 | a | 62.88 | 70.77 | 69.77 | 60.34 | a | 47.53 | a | 34.52 | 23.03 | 46.00 | ||||||||
2021 | 25.58 | a | 26.38 | 33.85 | a | 41.38 | 53.20 | a | 67.33 | 73.73 | 67.44 | 61.43 | b | 47.23 | a | 40.88 | a | 29.24 | 47.31 | |||||||
2022 | 26.89 | 25.59 | 35.52 | i | 43.73 | 52.06 | d | 61.33 | 72.24 | 71.23 | 62.46 | d | 46.33 | a | 29.53 | 22.31 | b | 46.70 | a | |||||||
2023 | 19.65 | 20.45 | 22.11 | 34.95 | 53.81 | 58.65 | 69.87 | 66.97 | 58.62 | 46.84 | 34.33 | 26.36 | b | 42.72 | ||||||||||||
2024 | 25.48 | 32.50 | 33.00 | 43.92 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.33 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 22.80 | 26.48 | 34.26 | 42.57 | 52.01 | 61.34 | 68.74 | 66.72 | 58.00 | 46.22 | 33.48 | 24.26 | 44.54 | |||||||||||||
S.D. | 4.77 | 4.01 | 4.14 | 3.18 | 2.52 | 2.91 | 2.35 | 2.24 | 2.84 | 3.05 | 3.45 | 3.55 | 1.49 | |||||||||||||
SKEW | -0.33 | -0.47 | -0.61 | -0.31 | -0.31 | 0.08 | 0.28 | -0.18 | -0.59 | -0.07 | -0.27 | 0.15 | 0.30 | |||||||||||||
MAX | 32.74 | 33.30 | 41.37 | 49.16 | 56.74 | 67.33 | 73.73 | 71.23 | 62.46 | 53.35 | 40.88 | 33.44 | 48.67 | |||||||||||||
MIN | 10.92 | 16.06 | 22.11 | 34.95 | 46.29 | 54.85 | 64.10 | 60.37 | 50.35 | 38.62 | 25.05 | 16.85 | 41.78 | |||||||||||||
YRS | 61 | 65 | 64 | 61 | 62 | 62 | 63 | 63 | 60 | 60 | 58 | 61 | 47 |