YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.45 | 28.45 | k | |
1959 | 23.17 | a | 23.59 | 29.71 | 42.42 | 45.05 | 61.20 | 68.73 | 64.18 | 52.77 | 44.61 | 32.07 | a | 22.21 | 42.47 | |||||||||||
1960 | 14.79 | 17.02 | 29.32 | a | 42.00 | 48.84 | 60.88 | 71.76 | 60.75 | e | 57.66 | a | 43.84 | 30.92 | 23.61 | 41.78 | ||||||||||
1961 | 23.23 | 29.07 | 32.32 | 39.90 | 50.94 | 65.78 | 69.55 | 69.82 | 49.43 | 41.92 | 29.37 | 18.42 | 43.31 | |||||||||||||
1962 | 13.74 | 22.29 | 24.27 | 43.83 | 47.95 | 58.71 | a | 65.02 | 63.21 | 57.57 | 48.18 | 34.80 | 25.16 | 42.06 | ||||||||||||
1963 | 13.03 | b | 34.05 | 33.05 | a | 37.67 | 51.87 | 54.33 | 65.92 | 66.66 | 60.18 | 49.56 | 30.75 | 18.85 | 43.00 | |||||||||||
1964 | 15.68 | 15.76 | 21.97 | 37.50 | 49.60 | 53.54 | b | 69.15 | a | 63.24 | 53.13 | 47.95 | 28.58 | 21.52 | 39.80 | |||||||||||
1965 | 22.60 | 22.59 | 25.63 | 41.47 | 46.77 | 56.75 | 65.29 | 62.37 | 49.38 | 49.27 | 35.60 | a | 22.34 | 41.67 | ||||||||||||
1966 | 19.48 | 20.50 | 30.27 | a | 40.65 | 54.42 | 58.03 | 69.52 | 65.90 | 60.12 | 43.77 | 33.48 | 19.15 | a | 42.94 | |||||||||||
1967 | 24.13 | 24.55 | 29.61 | 35.32 | 49.03 | 56.05 | 69.44 | 70.10 | 61.10 | 44.42 | a | 33.30 | 16.16 | 42.77 | ||||||||||||
1968 | 18.00 | 27.29 | 36.08 | 36.43 | b | 48.23 | g | 58.35 | 68.94 | 59.65 | ----- | z | 44.32 | 29.03 | 19.15 | 39.72 | b | |||||||||
1969 | 20.87 | e | 19.98 | 23.69 | 41.67 | 55.63 | a | 56.45 | 67.32 | 69.15 | 57.70 | 38.68 | 32.72 | a | 24.25 | a | 42.34 | |||||||||
1970 | 23.05 | b | 30.40 | d | 29.89 | 33.62 | a | 50.52 | a | 59.97 | a | 67.11 | d | 69.24 | b | 47.59 | c | 38.87 | 30.26 | c | 16.71 | b | 41.43 | |||
1971 | 18.97 | b | 21.02 | 23.52 | 36.88 | 49.92 | 56.45 | 66.77 | 69.91 | c | 49.62 | a | 41.45 | 28.68 | 17.02 | 40.02 | ||||||||||
1972 | 16.54 | c | 23.67 | 35.40 | 38.92 | 51.71 | 60.60 | 65.06 | 67.50 | 51.02 | 44.42 | 28.88 | 14.42 | 41.51 | ||||||||||||
1973 | 16.13 | 21.75 | 27.60 | 38.02 | 52.00 | a | 59.87 | 67.17 | a | 66.29 | 55.03 | 45.05 | 29.31 | a | 23.42 | 41.80 | ||||||||||
1974 | 17.07 | a | 23.27 | 31.37 | 41.68 | 48.82 | 64.10 | a | 67.69 | 63.91 | d | 58.09 | a | 46.67 | a | 31.93 | 20.65 | 42.94 | ||||||||
1975 | 16.65 | 18.94 | d | 27.23 | 32.20 | 45.95 | 55.77 | f | 70.13 | 62.38 | c | 57.58 | 41.90 | 26.53 | 26.38 | a | 38.72 | a | ||||||||
1976 | 20.23 | 22.79 | 24.74 | 39.68 | 52.82 | 56.63 | 67.78 | a | 61.44 | 58.00 | 43.63 | 34.52 | 24.23 | 42.21 | ||||||||||||
1977 | 17.38 | a | 26.84 | 28.50 | 46.14 | a | 45.97 | 63.98 | 66.62 | a | 65.77 | a | 55.72 | a | 46.13 | a | 29.92 | 25.37 | 43.20 | |||||||
1978 | 23.40 | 24.96 | 34.15 | ----- | z | 47.67 | a | 58.48 | e | 67.12 | c | 63.18 | 53.52 | 46.21 | 28.10 | 13.31 | 41.83 | a | ||||||||
1979 | 9.61 | 21.20 | a | 29.02 | a | 39.05 | 50.50 | 59.54 | e | 67.07 | c | 63.70 | a | 60.33 | 48.21 | c | 27.53 | 25.24 | b | 41.75 | ||||||
1980 | 23.39 | q | 32.47 | n | 30.20 | a | ----- | z | 49.63 | 57.16 | a | 66.74 | 62.60 | a | 55.78 | 45.10 | 31.21 | a | 27.62 | e | 47.34 | c | ||||
1981 | 27.55 | b | 24.71 | 35.86 | b | 43.20 | c | 49.18 | a | 58.90 | 67.92 | 71.95 | a | 59.78 | 41.35 | 33.48 | g | 24.73 | c | 45.92 | a | |||||
1982 | 16.57 | b | 22.57 | g | 31.79 | b | 36.10 | d | 48.47 | a | 58.37 | d | 64.52 | 68.05 | a | 55.22 | c | 41.76 | j | 23.17 | l | 19.72 | a | 44.31 | c | |
1983 | 24.38 | b | 24.96 | b | 32.07 | a | 35.20 | b | 50.19 | d | 56.72 | a | 66.45 | k | 68.72 | h | 55.96 | e | 47.23 | k | 23.81 | q | 13.23 | c | 36.59 | d |
1984 | 15.00 | c | 19.43 | b | 28.29 | b | 37.92 | f | 48.98 | e | 56.57 | a | 67.90 | a | 67.68 | 54.12 | a | 41.81 | j | 28.00 | h | 14.98 | i | 44.75 | d | |
1985 | 16.63 | a | 12.71 | 25.29 | b | 42.60 | d | 53.08 | a | 61.70 | b | 71.67 | a | 63.60 | 49.08 | d | 42.42 | g | 22.07 | c | 15.66 | 39.46 | a | |||
1986 | 23.95 | a | 28.23 | 38.89 | d | 42.60 | a | 51.95 | b | 66.33 | c | 64.82 | a | 70.10 | a | 48.67 | f | 45.17 | h | 31.57 | j | 23.85 | g | 48.36 | d | |
1987 | 19.52 | e | 27.67 | d | 35.31 | g | 50.98 | c | 57.11 | h | ----- | z | 65.22 | f | 64.94 | d | 61.92 | k | 51.20 | k | 32.42 | l | 21.15 | g | 40.78 | h |
1988 | 18.44 | g | 26.14 | d | 32.15 | g | 51.39 | k | 54.34 | o | 68.75 | l | 72.02 | i | 68.82 | l | 56.93 | c | 55.03 | m | 26.11 | l | 17.35 | g | 41.53 | j |
1989 | 13.44 | n | 16.90 | d | 32.57 | c | 48.69 | l | 50.27 | t | 61.20 | t | 73.70 | h | 66.63 | d | 55.79 | i | 47.78 | m | 31.73 | j | 24.17 | g | 38.70 | i |
1990 | 24.16 | b | 21.44 | l | 35.83 | h | 48.21 | i | 48.25 | g | 59.90 | i | 71.18 | a | ----- | z | 64.17 | g | 45.79 | n | 33.44 | f | 13.22 | b | 36.19 | i |
1991 | 18.50 | e | 35.46 | a | 33.23 | a | 41.80 | h | 47.70 | d | 59.19 | f | 70.64 | i | 70.22 | m | 60.94 | m | 45.27 | g | 27.57 | a | 23.36 | q | 32.49 | g |
1992 | 23.48 | i | 33.21 | e | 42.66 | f | 50.65 | j | 59.13 | d | 63.85 | 66.97 | 69.78 | b | 58.30 | 50.10 | a | 26.36 | a | 17.00 | 49.41 | c | ||||
1993 | 17.26 | d | 20.69 | a | 30.76 | 39.30 | 55.07 | a | 55.52 | b | 59.36 | i | 63.21 | b | 57.80 | 46.19 | 26.37 | d | 21.89 | c | 39.46 | a | ||||
1994 | 26.17 | a | 23.46 | 38.74 | b | 45.92 | 56.21 | 63.97 | 72.42 | a | 71.42 | 62.59 | c | 44.97 | a | 22.97 | 21.62 | b | 45.87 | |||||||
1995 | 21.35 | d | 30.66 | 32.34 | 42.05 | b | 48.73 | ----- | z | 67.30 | a | 67.89 | c | 59.02 | e | ----- | z | 39.28 | c | ----- | z | 45.40 | c | |||
1996 | 20.43 | k | 27.61 | b | 35.16 | f | 42.34 | h | 50.47 | b | 65.48 | f | 73.34 | b | 68.80 | f | 56.92 | d | 40.32 | t | 34.94 | f | 21.65 | g | 52.09 | h |
1997 | 19.74 | l | 24.90 | g | 35.67 | k | 39.08 | f | 56.09 | b | 61.11 | c | 68.00 | a | 67.70 | h | 60.02 | i | 44.13 | h | 31.26 | g | 20.79 | 51.50 | h | |
1998 | 25.71 | b | 26.60 | c | 30.31 | d | 42.00 | c | 50.50 | d | 55.57 | 72.83 | a | 68.65 | 61.65 | 44.42 | 30.52 | a | 18.07 | a | 43.90 | |||||
1999 | 22.77 | 21.09 | a | 29.88 | a | 39.40 | 47.26 | 57.90 | a | 66.43 | b | 68.29 | b | 55.73 | 47.47 | 38.38 | 23.03 | b | 43.14 | |||||||
2000 | 20.77 | a | 28.64 | 32.16 | 46.50 | a | 52.35 | 62.12 | a | 71.32 | a | 70.50 | a | 56.68 | b | 44.20 | a | 22.81 | a | 20.53 | a | 44.05 | ||||
2001 | 17.26 | 19.09 | a | 35.02 | c | 41.10 | 55.76 | b | 60.73 | b | 69.14 | b | 70.92 | a | 61.18 | 46.52 | 35.22 | a | 15.70 | a | 43.97 | |||||
2002 | 16.12 | a | 16.30 | 25.71 | 41.85 | 50.75 | a | 62.74 | a | 73.23 | a | 64.84 | 57.91 | b | 41.50 | 30.38 | 24.61 | 42.16 | ||||||||
2003 | 27.18 | 24.91 | 35.10 | 40.47 | 52.26 | 60.98 | 74.31 | b | 71.82 | 59.00 | b | 50.57 | b | 26.22 | a | 24.93 | a | 45.65 | ||||||||
2004 | 17.31 | b | 19.79 | 36.95 | 45.50 | 49.68 | a | 60.65 | 68.27 | 65.56 | 55.59 | a | 44.50 | e | 30.90 | f | 24.42 | e | 44.39 | a | ||||||
2005 | 21.55 | c | 22.66 | 33.90 | b | 41.37 | d | 50.29 | b | 54.13 | c | 69.93 | a | 67.23 | 56.02 | a | 46.29 | 31.47 | 19.88 | a | 42.89 | |||||
2006 | 21.96 | c | 19.48 | 28.12 | a | 41.76 | a | 54.23 | a | 61.95 | 72.42 | 65.40 | a | 55.55 | 42.62 | a | 30.88 | 21.45 | 42.99 | |||||||
2007 | 16.82 | 27.91 | 37.48 | b | 43.83 | 54.18 | 62.61 | b | 74.83 | a | 68.34 | c | 56.92 | 43.03 | 33.52 | 19.19 | b | 44.89 | ||||||||
2008 | 14.02 | 21.22 | 28.20 | d | 39.65 | d | 52.14 | b | 60.00 | c | 70.79 | e | 69.27 | 59.12 | 47.85 | a | 40.33 | 25.98 | b | 44.05 | ||||||
2009 | 27.24 | 24.66 | 31.65 | 43.33 | 53.44 | 57.45 | 69.63 | 67.53 | b | 64.77 | 42.90 | 35.07 | a | 17.61 | 44.61 | |||||||||||
2010 | 24.23 | a | 23.27 | 32.47 | 41.22 | 45.97 | 58.25 | 67.40 | 65.07 | a | 58.68 | 48.76 | 27.09 | c | 23.58 | a | 43.00 | |||||||||
2011 | 17.57 | a | 18.91 | 29.68 | c | 36.03 | 46.55 | 55.87 | 68.60 | 68.98 | a | 61.90 | a | 45.71 | 28.30 | 22.06 | 41.68 | |||||||||
2012 | 23.68 | 24.50 | 34.63 | a | 46.07 | 51.50 | 61.21 | a | 71.52 | 72.18 | 62.68 | 45.98 | a | 36.02 | 24.45 | 46.20 | ||||||||||
2013 | 15.65 | a | 23.70 | 34.44 | 43.15 | 54.53 | 65.22 | 74.39 | 72.84 | 60.18 | 44.03 | 33.85 | 17.45 | 44.95 | ||||||||||||
2014 | 25.61 | 27.86 | 38.69 | 45.28 | 56.55 | 62.88 | 74.52 | c | 66.66 | 60.90 | 50.66 | 31.75 | 28.00 | 47.45 | ||||||||||||
2015 | 25.06 | 35.25 | 43.02 | 45.27 | 54.53 | 68.42 | 67.16 | c | 70.34 | b | 62.07 | a | 50.90 | 27.77 | 19.32 | 47.43 | ||||||||||
2016 | 19.92 | 25.78 | 34.32 | 47.62 | 50.63 | 64.85 | 68.34 | 67.50 | 56.67 | 45.14 | b | 37.40 | 15.37 | 44.46 | ||||||||||||
2017 | 15.08 | 27.62 | 39.29 | e | 41.45 | 52.76 | 62.43 | a | 73.10 | 68.90 | a | 56.21 | a | 39.39 | 32.22 | 21.19 | 44.14 | |||||||||
2018 | 25.90 | 22.77 | 28.79 | 41.40 | 53.11 | 59.78 | g | 72.32 | c | 66.87 | a | 57.88 | 42.19 | 27.72 | c | 16.44 | 41.40 | a | ||||||||
2019 | 17.81 | 14.94 | c | 26.94 | g | 39.23 | 46.31 | 55.63 | 66.81 | 65.95 | 52.10 | a | 30.85 | a | 28.38 | 16.25 | a | 39.48 | a | |||||||
2020 | 17.95 | 17.29 | 28.40 | 37.50 | 48.31 | 54.47 | a | 64.52 | a | 68.13 | 56.86 | a | 42.00 | 25.70 | 19.18 | 40.03 | ||||||||||
2021 | 18.19 | 18.18 | 29.48 | 37.93 | 47.53 | 65.60 | a | 73.61 | h | 63.29 | 55.55 | a | 41.15 | a | 30.27 | 19.29 | 38.77 | a | ||||||||
2022 | 13.82 | 14.86 | 29.02 | 32.13 | 42.74 | 55.12 | 71.03 | 69.36 | b | 59.95 | 44.40 | 19.60 | 13.68 | 38.81 | ||||||||||||
2023 | 13.40 | 14.98 | 19.11 | 32.28 | 51.48 | 54.15 | 69.71 | 65.15 | 55.12 | 42.11 | 29.19 | a | 23.89 | 39.21 | ||||||||||||
2024 | 20.37 | 24.28 | 29.16 | 39.85 | 44.76 | 60.93 | 70.48 | 66.52 | a | 58.97 | 46.76 | 25.12 | ----- | z | 44.29 | a | ||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.70 | 23.39 | 31.06 | 40.65 | 50.67 | 59.68 | 69.13 | 66.87 | 57.00 | 44.69 | 30.32 | 20.64 | 42.99 | |||||||||||||
S.D. | 4.24 | 5.09 | 4.64 | 3.95 | 3.35 | 3.60 | 2.77 | 3.11 | 3.69 | 3.56 | 4.28 | 4.02 | 1.99 | |||||||||||||
SKEW | 0.05 | 0.26 | 0.03 | -0.10 | 0.09 | 0.26 | 0.33 | -0.18 | -0.55 | -0.93 | 0.06 | -0.08 | 0.16 | |||||||||||||
MAX | 27.55 | 35.46 | 43.02 | 50.98 | 59.13 | 68.42 | 74.83 | 72.84 | 64.77 | 50.90 | 40.33 | 28.45 | 47.45 | |||||||||||||
MIN | 9.61 | 12.71 | 19.11 | 32.13 | 42.74 | 53.54 | 64.52 | 59.65 | 47.59 | 30.85 | 19.60 | 13.22 | 38.81 | |||||||||||||
YRS | 60 | 62 | 59 | 56 | 61 | 57 | 59 | 60 | 59 | 53 | 54 | 58 | 41 |