YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.32 | 60.05 | 54.58 | 41.67 | a | 31.35 | 32.27 | 47.21 | f | |||||
1981 | 27.19 | 25.77 | 30.44 | 42.92 | 46.23 | 57.83 | 62.05 | 60.26 | 54.87 | 41.43 | a | 34.27 | 23.40 | 42.22 | ||||||||||||
1982 | 20.02 | b | 22.15 | a | 29.67 | b | 34.88 | 45.23 | 53.35 | c | 60.21 | 61.30 | a | 52.65 | 39.12 | a | 28.07 | c | 22.27 | c | 39.08 | |||||
1983 | 23.07 | a | 25.02 | d | 30.62 | b | 33.45 | b | 42.66 | 53.20 | 62.20 | a | 62.50 | 55.88 | 44.77 | a | 30.98 | a | 20.50 | c | 40.40 | |||||
1984 | 17.30 | d | 23.67 | b | 29.05 | 34.23 | 49.48 | 53.55 | b | 62.19 | b | 60.60 | 52.87 | c | 36.81 | d | 30.94 | c | 23.35 | g | 40.97 | a | ||||
1985 | 19.22 | d | 20.40 | b | 31.22 | b | 41.07 | b | 48.95 | 57.62 | a | 61.48 | 61.62 | a | 49.72 | a | 43.72 | a | 29.38 | a | 24.03 | b | 40.70 | |||
1986 | ----- | z | 27.37 | b | 37.74 | b | 40.41 | c | 48.17 | b | 58.77 | 60.15 | 60.95 | 51.16 | b | 41.81 | e | 31.62 | d | 23.29 | b | 43.77 | a | |||
1987 | 19.07 | h | 26.44 | d | 30.36 | f | 41.71 | d | 48.48 | a | 58.40 | 61.52 | d | 59.86 | b | 53.96 | e | 46.74 | b | 31.27 | f | 19.85 | g | 49.64 | d | |
1988 | 17.55 | j | 25.87 | f | 28.81 | j | 40.16 | e | 48.58 | f | 61.36 | b | 64.50 | 62.58 | 51.73 | 46.92 | a | 28.98 | b | 20.31 | g | 50.89 | e | |||
1989 | 19.52 | h | 22.58 | b | 35.85 | 42.16 | a | 49.50 | 56.52 | b | 64.05 | 59.03 | a | 54.91 | b | 43.27 | a | 32.62 | a | 21.08 | 43.78 | a | ||||
1990 | 20.87 | 26.09 | 35.34 | 41.60 | 47.18 | 60.40 | 60.73 | 60.19 | 57.05 | 43.47 | a | 32.95 | a | 17.43 | a | 41.94 | ||||||||||
1991 | 18.65 | 28.57 | 30.25 | a | 37.82 | 50.70 | a | 57.28 | 61.61 | 61.10 | 53.47 | a | 44.83 | b | 27.60 | a | 20.58 | 41.04 | ||||||||
1992 | 19.27 | a | 26.12 | 33.18 | 42.72 | 49.00 | 53.02 | 56.79 | 57.14 | b | 52.82 | 45.95 | 22.39 | b | 17.69 | 39.67 | ||||||||||
1993 | 21.95 | a | 22.02 | 30.71 | b | 34.78 | a | 46.13 | e | 52.66 | a | 57.37 | a | 57.44 | d | 50.66 | a | 41.27 | a | ----- | z | 21.06 | d | 39.64 | a | |
1994 | 23.16 | 23.17 | b | 33.24 | 39.00 | b | 50.42 | 59.90 | 61.65 | a | 62.26 | 53.61 | c | 42.03 | a | 28.23 | b | ----- | z | 43.33 | a | |||||
1995 | 22.27 | 32.16 | 32.79 | b | 36.58 | f | 43.38 | a | 54.13 | 58.75 | a | 62.02 | a | 54.67 | 41.71 | b | 34.10 | a | ----- | z | 43.60 | b | ||||
1996 | 20.86 | b | 28.16 | a | ----- | z | 38.47 | a | 51.68 | 57.68 | 63.26 | 60.14 | b | 50.47 | a | 41.12 | b | 32.21 | a | 19.59 | c | 42.15 | a | |||
1997 | 22.06 | 22.98 | 33.40 | 35.10 | 48.35 | a | 58.30 | 61.31 | b | 59.62 | b | 55.40 | a | 42.83 | k | 30.45 | 21.58 | a | 40.78 | a | ||||||
1998 | 24.59 | b | 24.18 | c | 29.96 | f | 35.71 | b | 51.35 | a | 53.32 | 64.58 | a | 62.25 | a | 58.78 | c | ----- | z | 34.45 | 23.73 | 43.29 | b | |||
1999 | 25.55 | b | 28.30 | 37.78 | a | 37.20 | c | 46.58 | 56.53 | 62.93 | b | 61.11 | 52.48 | 46.66 | 39.85 | 24.08 | 43.26 | |||||||||
2000 | 27.69 | b | 30.66 | a | 34.08 | 43.50 | a | 52.18 | a | 58.19 | a | 64.61 | 63.61 | 55.58 | 45.65 | a | 22.84 | b | 22.76 | d | 43.45 | |||||
2001 | 21.59 | b | 25.85 | b | 33.39 | 42.21 | a | 51.17 | b | 59.52 | b | 64.88 | b | 61.71 | 56.53 | 46.12 | a | 35.83 | a | 21.66 | c | 43.37 | ||||
2002 | 21.37 | 21.52 | a | 28.40 | 44.12 | 50.82 | 62.13 | 66.55 | a | 63.38 | a | 55.28 | 42.32 | 29.63 | 24.68 | a | 42.52 | |||||||||
2003 | 28.58 | 24.55 | 32.07 | a | 40.86 | a | 50.15 | a | 56.13 | 67.77 | 63.81 | 53.37 | 49.94 | 30.55 | b | 24.44 | 43.52 | |||||||||
2004 | 22.29 | b | 23.79 | 37.52 | a | 42.68 | 50.60 | a | 57.20 | 61.53 | a | 59.66 | 52.90 | a | 43.53 | 32.91 | a | 23.61 | 42.35 | |||||||
2005 | 28.23 | 26.93 | 31.72 | a | 40.66 | a | 50.16 | 55.10 | 64.77 | a | 59.60 | a | 55.47 | 46.00 | 32.17 | 21.31 | 42.67 | |||||||||
2006 | 23.75 | a | 24.83 | b | 30.64 | b | 43.48 | c | 51.65 | 60.57 | 64.67 | a | 61.10 | 50.22 | 43.48 | e | 33.43 | 23.24 | 42.59 | |||||||
2007 | 20.17 | a | 28.26 | a | 35.85 | a | 42.62 | a | 49.82 | 59.34 | e | 65.61 | 64.34 | 56.10 | 44.05 | a | 36.27 | 20.48 | 43.58 | |||||||
2008 | 17.42 | a | 23.80 | a | 29.72 | b | 35.50 | 47.24 | b | 56.96 | b | 64.05 | 62.50 | a | 54.67 | 44.53 | 35.45 | b | 22.66 | c | 41.21 | |||||
2009 | 24.14 | b | 27.60 | c | 32.77 | 37.02 | 50.97 | 54.82 | 62.73 | a | 60.29 | 55.77 | 39.13 | a | 35.00 | b | 17.95 | a | 41.52 | |||||||
2010 | 23.20 | a | 22.36 | 32.45 | 38.83 | a | 45.79 | 58.25 | 63.21 | b | 60.52 | 56.21 | b | 44.62 | a | 28.53 | 27.22 | a | 41.77 | |||||||
2011 | 18.60 | 19.04 | 31.89 | 36.27 | 43.39 | 57.18 | 62.56 | 63.05 | 54.37 | 42.92 | 30.10 | 21.97 | 40.11 | |||||||||||||
2012 | 22.81 | 23.12 | 35.32 | a | 44.03 | 50.18 | ----- | z | 63.69 | 62.05 | 54.57 | 43.11 | 35.47 | 21.03 | 41.40 | a | ||||||||||
2013 | 17.48 | 19.98 | 29.23 | 35.52 | 46.97 | 59.23 | 63.16 | 60.65 | 54.65 | 39.92 | 30.87 | 18.63 | 39.69 | |||||||||||||
2014 | 20.89 | 24.77 | 30.92 | 37.37 | 46.61 | 55.68 | 63.05 | 57.52 | 55.77 | 45.06 | 29.43 | c | 24.45 | 40.96 | ||||||||||||
2015 | 24.71 | 28.41 | 35.16 | 40.52 | 45.02 | 59.93 | 60.02 | 61.13 | 56.48 | 47.40 | 30.22 | 20.73 | 42.48 | |||||||||||||
2016 | 19.11 | 26.55 | 31.97 | 38.80 | 46.56 | 60.84 | a | 62.47 | a | 58.02 | 54.25 | 47.05 | 36.12 | 22.00 | 41.98 | |||||||||||
2017 | 20.06 | 30.39 | 36.03 | 39.47 | 46.16 | 59.20 | 63.18 | 59.77 | 54.32 | 42.44 | 38.07 | 26.19 | 42.94 | |||||||||||||
2018 | 25.29 | 24.46 | 31.08 | 39.92 | 51.68 | 60.03 | 64.66 | 61.24 | 57.58 | 41.85 | 27.12 | 19.63 | 42.05 | |||||||||||||
2019 | 20.05 | 20.43 | 29.56 | 40.27 | 42.34 | 54.83 | 62.69 | 62.40 | 59.00 | k | 36.29 | 31.53 | 19.93 | a | 38.21 | a | ||||||||||
2020 | 20.15 | 20.31 | 32.69 | 37.83 | 50.77 | 57.22 | 61.84 | 65.05 | 54.27 | 43.98 | 32.85 | 19.79 | 41.40 | |||||||||||||
2021 | 20.63 | 22.27 | 30.15 | 39.70 | 47.92 | 60.00 | 65.03 | 60.82 | 57.55 | 42.27 | 36.75 | 25.97 | 42.42 | |||||||||||||
2022 | 20.18 | 20.23 | 28.87 | 37.68 | 47.71 | 57.95 | 63.32 | 61.92 | 57.97 | 41.63 | 26.58 | 21.24 | 40.44 | |||||||||||||
2023 | 20.47 | 20.18 | 24.45 | 34.35 | 49.90 | 53.80 | 63.66 | 62.37 | 55.28 | 45.08 | 33.08 | 24.89 | 40.63 | |||||||||||||
2024 | 21.79 | 25.79 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.79 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.92 | 24.68 | 32.24 | 39.20 | 48.32 | 57.33 | 62.74 | 61.10 | 54.44 | 43.37 | 31.70 | 22.28 | 41.73 | |||||||||||||
S.D. | 2.91 | 3.18 | 2.88 | 3.05 | 2.66 | 2.57 | 2.17 | 1.77 | 2.12 | 2.80 | 3.68 | 2.86 | 1.25 | |||||||||||||
SKEW | 0.61 | 0.24 | 0.01 | -0.17 | -0.56 | -0.24 | -0.52 | -0.19 | -0.34 | -0.32 | -0.29 | 0.98 | -0.33 | |||||||||||||
MAX | 28.58 | 32.16 | 37.78 | 44.12 | 52.18 | 62.13 | 67.77 | 65.05 | 58.78 | 49.94 | 39.85 | 32.27 | 43.58 | |||||||||||||
MIN | 17.30 | 19.04 | 24.45 | 33.45 | 42.34 | 52.66 | 56.79 | 57.14 | 49.72 | 36.29 | 22.39 | 17.43 | 39.08 | |||||||||||||
YRS | 40 | 43 | 39 | 42 | 42 | 42 | 44 | 44 | 43 | 42 | 42 | 39 | 30 |