| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | 48.50 | 56.41 | a | 65.85 | a | 59.13 | 53.02 | c | 45.62 | s | ----- | z | ----- | z | 56.58 | g | ||
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | 44.47 | 53.07 | a | 62.23 | 58.21 | 51.03 | a | 44.12 | a | ----- | z | ----- | z | 52.19 | f | |||
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.23 | a | ----- | z | 21.60 | 32.42 | j | |
| 1969 | 25.35 | a | 21.09 | 18.63 | a | 41.55 | 51.05 | a | 51.78 | 64.27 | a | 63.87 | 56.20 | 31.85 | a | 28.48 | 24.23 | a | 39.86 | |||||||
| 1970 | 21.74 | 27.80 | a | 23.52 | 32.63 | 47.97 | 54.93 | 63.28 | a | 64.06 | 49.65 | 34.47 | 29.88 | 23.42 | a | 39.45 | ||||||||||
| 1971 | 24.03 | 21.81 | a | ----- | z | ----- | z | 45.15 | 58.52 | 61.85 | a | 62.56 | 49.45 | 39.95 | 28.98 | 21.38 | b | 41.37 | b | |||||||
| 1972 | 23.50 | 27.57 | 37.32 | 39.34 | a | 47.56 | 59.23 | 60.40 | 59.68 | 52.95 | 42.08 | ----- | z | 15.48 | e | 42.28 | a | |||||||||
| 1973 | 17.56 | g | 15.86 | 24.82 | 31.10 | a | 45.55 | 55.52 | 59.94 | 60.03 | 48.83 | 41.90 | 28.35 | 23.35 | g | 41.19 | b | |||||||||
| 1974 | 19.15 | g | 20.20 | 29.87 | 35.65 | f | 48.74 | 56.78 | 61.63 | 55.82 | 45.87 | 39.84 | 28.20 | 15.77 | 40.27 | b | ||||||||||
| 1975 | 20.29 | e | 17.74 | a | 25.65 | 30.93 | 41.40 | b | 54.35 | g | 64.18 | 59.63 | 49.88 | 43.02 | 26.40 | 24.82 | 36.72 | a | ||||||||
| 1976 | 20.02 | 27.47 | 29.05 | a | 39.20 | 47.57 | a | 56.67 | 66.12 | a | 60.55 | 54.30 | 39.48 | 29.40 | a | 24.32 | 41.18 | |||||||||
| 1977 | 18.70 | a | 22.34 | 23.92 | a | 39.59 | c | 49.93 | b | 62.29 | d | 64.11 | 61.27 | 56.22 | 42.85 | 31.05 | ----- | z | 42.93 | a | ||||||
| 1978 | 19.63 | 24.43 | 33.42 | 40.45 | ----- | z | 56.78 | 65.21 | 59.97 | 53.12 | 41.40 | 29.77 | 14.05 | 39.84 | a | |||||||||||
| 1979 | 8.93 | b | 23.59 | 30.15 | 38.30 | 44.62 | a | 57.27 | 64.58 | 60.02 | 55.38 | 44.26 | 18.24 | a | 25.45 | 39.23 | ||||||||||
| 1980 | 20.08 | 21.38 | ----- | z | 35.42 | 45.52 | 58.97 | 64.34 | 57.26 | ----- | z | ----- | z | 29.00 | 32.64 | i | 41.49 | d | ||||||||
| 1981 | 25.74 | 26.84 | 30.61 | 44.43 | b | 44.55 | 59.45 | 63.75 | a | 58.74 | 55.37 | 39.95 | 35.40 | e | 22.82 | 42.30 | ||||||||||
| 1982 | 17.72 | b | 26.23 | d | 29.11 | h | 34.00 | r | 43.19 | 52.23 | 62.48 | d | 64.52 | 51.63 | 38.82 | 28.32 | m | 19.90 | j | 44.60 | d | |||||
| 1983 | 22.48 | k | 23.52 | 25.55 | 28.59 | c | 40.29 | ----- | z | 61.24 | 62.76 | d | 53.32 | 41.20 | p | 28.74 | c | 22.92 | s | 40.50 | d | |||||
| 1984 | 17.11 | i | 16.22 | 22.98 | 27.42 | 45.18 | 51.23 | 63.76 | 61.35 | 50.63 | c | 36.70 | a | 29.44 | d | 21.39 | 38.76 | a | ||||||||
| 1985 | 13.52 | j | 21.17 | e | 30.91 | b | 38.00 | 45.77 | 54.12 | 61.06 | 58.69 | 51.50 | h | 38.08 | r | 24.59 | m | 20.82 | k | 44.25 | e | |||||
| 1986 | 26.19 | 22.46 | e | 34.82 | 37.02 | 43.39 | 57.56 | e | 59.45 | 60.15 | 48.48 | 38.89 | c | 28.86 | l | 20.29 | 40.79 | a | ||||||||
| 1987 | 20.50 | a | 27.48 | d | 27.35 | 40.22 | 49.68 | 57.35 | c | 61.32 | 58.57 | a | 51.27 | 42.95 | c | 26.25 | 18.63 | 40.13 | ||||||||
| 1988 | 10.76 | h | 19.78 | 24.32 | 38.17 | 47.24 | j | 60.04 | d | 63.62 | k | 62.59 | n | 52.09 | g | 45.67 | d | 28.89 | h | 20.53 | 34.75 | f | ||||
| 1989 | 23.47 | b | 11.40 | b | 35.29 | c | 37.22 | g | 49.29 | j | 55.63 | o | 64.73 | t | 61.95 | i | 52.83 | c | 40.45 | c | 29.80 | j | 21.19 | b | 30.77 | f |
| 1990 | 26.38 | a | 19.55 | i | 31.98 | 40.27 | 46.95 | 59.78 | 62.07 | c | 61.30 | a | 57.90 | 43.34 | b | 34.05 | 19.44 | 43.95 | a | |||||||
| 1991 | 21.50 | 30.23 | 33.05 | 37.08 | 48.77 | 58.10 | j | 64.86 | c | 63.48 | h | 55.55 | 48.43 | c | 34.38 | j | 27.85 | d | 40.81 | c | ||||||
| 1992 | 22.33 | g | 29.19 | 34.31 | 43.17 | 51.26 | b | 57.05 | 60.78 | b | 60.44 | g | 53.87 | 43.62 | e | 22.96 | e | 19.86 | i | 44.02 | c | |||||
| 1993 | 20.61 | 16.75 | b | 32.17 | h | 39.12 | 52.32 | 58.96 | g | 64.31 | b | 63.97 | 53.11 | c | 42.72 | b | 25.54 | f | 20.34 | f | 44.11 | d | ||||
| 1994 | 25.12 | b | 23.62 | g | 37.27 | p | 45.61 | u | 51.09 | c | 59.27 | 61.71 | 61.37 | 53.17 | c | 38.39 | q | 27.28 | e | 25.21 | b | 45.53 | d | |||
| 1995 | 26.43 | x | 32.42 | j | 33.31 | g | 36.39 | k | 43.96 | q | 53.87 | c | 61.94 | f | 64.69 | 53.03 | k | 38.83 | h | 32.12 | 25.74 | 44.11 | h | |||
| 1996 | 19.23 | 24.57 | 28.89 | 37.92 | 47.89 | 58.32 | 63.95 | 60.10 | 49.37 | 40.00 | 28.72 | g | 25.10 | 41.39 | a | |||||||||||
| 1997 | 20.05 | 23.14 | 35.52 | 31.78 | 48.24 | 60.10 | 63.55 | 61.53 | 54.97 | 42.02 | b | 24.98 | 14.65 | 40.04 | ||||||||||||
| 1998 | 24.26 | 24.46 | 28.35 | d | 35.83 | 48.50 | 51.27 | 64.37 | 60.73 | 57.10 | 42.73 | 34.71 | b | 19.81 | j | 42.94 | a | |||||||||
| 1999 | 25.52 | d | 27.46 | 33.34 | 33.38 | 44.28 | a | 53.65 | 62.97 | 60.15 | 46.90 | 40.47 | 35.48 | 18.16 | 40.15 | |||||||||||
| 2000 | 21.42 | 27.77 | a | 29.15 | 38.90 | a | 49.81 | 57.87 | 65.39 | 64.84 | 51.10 | a | 42.58 | 13.31 | c | 15.82 | 39.83 | |||||||||
| 2001 | 14.75 | g | 21.52 | 30.60 | 37.60 | 47.18 | 60.48 | 65.85 | 63.06 | 54.40 | 41.92 | 31.24 | a | 21.24 | 43.19 | a | ||||||||||
| 2002 | 17.69 | 21.48 | 24.90 | 41.66 | h | 47.31 | 58.87 | 64.39 | 60.98 | 54.47 | 35.76 | 27.48 | 26.43 | k | 41.33 | b | ||||||||||
| 2003 | 30.10 | 20.05 | 30.71 | b | 39.62 | a | 49.40 | e | 55.32 | 65.69 | 65.19 | 52.40 | a | 47.44 | 30.80 | h | 24.06 | d | 43.63 | a | ||||||
| 2004 | 24.77 | 24.03 | 36.89 | d | 42.48 | b | 51.79 | 56.68 | 63.67 | a | 58.97 | 52.40 | 45.00 | 30.41 | h | 26.20 | a | 43.90 | a | |||||||
| 2005 | 30.30 | a | 25.50 | g | 34.61 | ----- | z | 52.77 | p | 55.97 | 66.82 | 61.50 | 55.62 | 44.60 | 32.87 | 21.06 | 44.82 | c | ||||||||
| 2006 | 26.52 | 21.84 | 28.82 | ----- | z | 50.27 | 61.90 | 67.21 | 63.15 | 48.70 | 38.68 | 31.53 | 20.34 | 41.72 | a | |||||||||||
| 2007 | 9.97 | 27.43 | 36.69 | 40.08 | 49.65 | 59.02 | 67.65 | 65.15 | 55.08 | 43.84 | 33.55 | 18.06 | 42.18 | |||||||||||||
| 2008 | 16.58 | 23.00 | 29.22 | a | 34.85 | 45.37 | 58.23 | 64.71 | 62.10 | a | 52.40 | 41.87 | 26.83 | x | 20.50 | 40.80 | a | |||||||||
| 2009 | 25.03 | 28.41 | 31.97 | 36.40 | 50.45 | 56.32 | 62.45 | 60.10 | 53.83 | 36.30 | a | 28.30 | 13.15 | 40.23 | ||||||||||||
| 2010 | 17.71 | 16.75 | 30.92 | 38.85 | 44.71 | 58.43 | 64.55 | 62.48 | 55.35 | 45.89 | 27.93 | 25.15 | 40.73 | |||||||||||||
| 2011 | 20.74 | 19.02 | 34.15 | 37.90 | a | 44.74 | 57.27 | 66.89 | 65.45 | 54.00 | 43.32 | 30.83 | 16.53 | 40.90 | ||||||||||||
| 2012 | 26.19 | 21.29 | 39.05 | 44.77 | 50.69 | 63.30 | 68.58 | 64.16 | 54.97 | 41.94 | 37.67 | 21.13 | 44.48 | |||||||||||||
| 2013 | 18.11 | 20.89 | 30.97 | 33.58 | 49.26 | 61.57 | a | 66.39 | 64.97 | 58.42 | 41.77 | 33.45 | 21.81 | 41.77 | ||||||||||||
| 2014 | 23.35 | 24.62 | 34.84 | 40.15 | 47.63 | 56.68 | 64.52 | 59.85 | 54.82 | 45.39 | 27.80 | 22.66 | 41.86 | |||||||||||||
| 2015 | 26.87 | 27.41 | 36.74 | 38.57 | 46.29 | 61.52 | 62.16 | b | 62.26 | 57.37 | 48.06 | 28.80 | 19.58 | 42.97 | ||||||||||||
| 2016 | 18.68 | 29.31 | 31.15 | 37.97 | 45.40 | 61.38 | 64.47 | 59.66 | 54.55 | 45.88 | a | 35.50 | 21.74 | 42.14 | ||||||||||||
| 2017 | 17.13 | 30.82 | 38.97 | 38.23 | 46.16 | 59.67 | 66.19 | 60.03 | 52.97 | 38.77 | 37.88 | 25.34 | 42.68 | |||||||||||||
| 2018 | 27.06 | 22.96 | 30.81 | 39.30 | 51.06 | 59.60 | 64.02 | 60.82 | 56.07 | 39.34 | 26.98 | 19.77 | 41.48 | |||||||||||||
| 2019 | 19.45 | 24.30 | 24.98 | 39.95 | 43.21 | 55.20 | 65.03 | 63.19 | 56.75 | 33.60 | 29.62 | 21.19 | 39.71 | |||||||||||||
| 2020 | 24.02 | 20.57 | 33.13 | 35.12 | 49.85 | 58.60 | 63.89 | 64.06 | 52.08 | 38.68 | 33.65 | 19.94 | 41.13 | |||||||||||||
| 2021 | 21.95 | 19.70 | 30.44 | 35.25 | 47.27 | 61.88 | 66.37 | 61.66 | 55.45 | 42.84 | 37.23 | 27.60 | 42.30 | |||||||||||||
| 2022 | 21.11 | 19.27 | 29.73 | 36.55 | 46.44 | 59.18 | 66.02 | 63.77 | 56.30 | 41.26 | 24.78 | 23.16 | 40.63 | |||||||||||||
| 2023 | 19.90 | a | 21.48 | 25.89 | 35.57 | 50.79 | 56.58 | 63.63 | 62.03 | 54.70 | 41.34 | 32.33 | 25.85 | 40.84 | ||||||||||||
| 2024 | 18.82 | 26.78 | 31.97 | 39.45 | 45.53 | 62.17 | 62.34 | 63.47 | 56.48 | 48.16 | 30.37 | 30.11 | 42.97 | |||||||||||||
| 2025 | 12.08 | 27.11 | 34.82 | 38.27 | 49.18 | 60.37 | 65.27 | 62.13 | 54.77 | 49.17 | s | ----- | z | ----- | z | 44.89 | c | |||||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 21.54 | 23.21 | 30.70 | 37.51 | 47.39 | 57.73 | 64.00 | 61.56 | 53.40 | 41.69 | 29.82 | 21.56 | 41.20 | |||||||||||||
| S.D. | 4.49 | 4.14 | 4.50 | 3.68 | 2.77 | 2.94 | 2.02 | 2.23 | 2.81 | 3.55 | 4.72 | 3.82 | 1.30 | |||||||||||||
| SKEW | -0.59 | -0.34 | -0.32 | -0.66 | -0.31 | -0.38 | -0.15 | -0.12 | -0.63 | -0.48 | -0.99 | -0.21 | 0.52 | |||||||||||||
| MAX | 30.30 | 30.82 | 39.05 | 44.77 | 52.32 | 63.30 | 68.58 | 65.45 | 58.42 | 48.43 | 37.88 | 30.11 | 44.48 | |||||||||||||
| MIN | 8.93 | 11.40 | 18.63 | 27.42 | 40.29 | 51.23 | 59.45 | 55.82 | 45.87 | 31.85 | 13.31 | 13.15 | 39.23 | |||||||||||||
| YRS | 48 | 53 | 51 | 48 | 54 | 54 | 56 | 55 | 55 | 53 | 44 | 47 | 26 | |||||||||||||