YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.13 | 46.68 | c | 42.19 | 36.45 | a | 28.76 | b | ----- | z | ----- | z | 38.84 | g | ||
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.83 | a | ----- | z | ----- | z | ----- | z | 39.83 | k |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | 22.73 | e | 22.46 | e | 26.00 | e | 28.93 | 38.60 | a | 44.14 | b | 50.76 | b | 50.96 | g | 37.67 | f | 29.54 | r | 18.50 | r | 13.83 | a | 30.93 | d | |
2001 | 14.83 | b | 15.15 | b | 22.54 | e | 26.92 | d | 37.67 | y | 44.77 | d | 51.75 | g | 50.54 | e | 42.27 | 33.68 | c | 24.62 | d | 19.60 | f | 30.59 | c | |
2002 | 14.79 | g | 12.35 | h | 16.23 | e | 29.41 | a | 34.41 | b | 45.69 | a | 52.45 | b | 47.43 | a | 41.70 | c | 26.89 | d | 23.04 | c | 21.57 | a | 33.88 | b |
2003 | 23.29 | c | 13.76 | c | 23.94 | 29.14 | a | 36.14 | b | 42.14 | b | 51.13 | a | 49.41 | b | 37.52 | a | 35.80 | a | 23.46 | b | 19.65 | 32.11 | |||
2004 | 19.19 | 14.10 | 26.87 | 28.80 | 37.17 | a | 42.80 | 48.77 | a | 45.00 | a | 40.60 | 32.71 | 24.00 | b | 20.84 | 31.74 | |||||||||
2005 | 21.23 | 18.15 | a | 23.03 | 28.07 | a | 36.23 | a | 43.43 | 51.29 | 47.94 | 41.03 | 31.61 | 25.69 | a | 17.03 | 32.06 | |||||||||
2006 | 21.71 | 15.93 | 20.29 | 29.55 | a | 37.55 | 46.28 | a | 52.10 | 49.65 | 36.73 | 31.63 | a | 24.87 | 18.39 | 32.06 | ||||||||||
2007 | 7.39 | 19.39 | 25.87 | 26.73 | 36.71 | 44.63 | 51.23 | 51.00 | 42.10 | 32.84 | 24.03 | 12.97 | 31.24 | |||||||||||||
2008 | 12.55 | 16.97 | 18.39 | 23.97 | 34.35 | 40.43 | 49.42 | 48.65 | 38.97 | 32.39 | 28.20 | 13.87 | 29.85 | |||||||||||||
2009 | 19.03 | 22.14 | 23.47 | a | 25.67 | 38.53 | a | 42.77 | 47.77 | 45.03 | 37.47 | 26.00 | 24.80 | 10.94 | 30.30 | |||||||||||
2010 | 17.00 | 12.50 | 21.55 | 28.73 | 33.10 | 45.37 | 51.13 | 49.61 | 41.03 | 35.71 | 21.67 | 20.74 | 31.51 | |||||||||||||
2011 | 18.61 | 10.96 | 24.90 | 28.70 | 34.10 | 43.53 | 52.74 | 51.48 | 41.10 | 32.52 | 23.30 | 14.45 | 31.37 | |||||||||||||
2012 | 21.81 | 13.93 | 26.55 | 31.50 | 36.65 | 48.80 | 53.06 | 49.16 | 41.90 | 31.90 | 26.63 | 16.45 | 33.20 | |||||||||||||
2013 | 13.84 | 15.04 | 19.16 | 22.97 | 36.32 | 44.63 | 51.58 | 50.10 | 46.77 | 30.71 | 25.90 | 15.84 | 31.07 | |||||||||||||
2014 | 19.19 | 15.75 | 21.03 | 28.37 | 35.77 | 42.67 | 51.61 | 48.03 | 43.80 | 36.23 | 21.30 | 17.77 | 31.79 | |||||||||||||
2015 | 18.97 | 17.96 | 24.61 | 29.13 | 35.19 | 47.21 | a | 49.65 | 49.32 | 44.80 | 38.26 | 22.97 | 18.03 | 33.01 | ||||||||||||
2016 | 18.77 | 24.71 | a | 23.00 | 29.57 | 33.71 | 47.53 | 51.84 | 47.45 | 41.00 | 35.48 | 27.93 | 16.42 | 33.12 | ||||||||||||
2017 | 14.55 | 21.96 | 27.43 | a | 26.93 | 34.06 | 44.17 | 50.71 | 46.84 | 41.23 | 29.87 | 27.93 | 20.97 | 32.22 | ||||||||||||
2018 | 19.74 | 12.89 | 20.68 | 26.57 | 39.03 | 45.83 | a | 49.94 | 47.29 | 42.54 | b | 31.10 | a | 22.90 | 17.65 | 31.35 | ||||||||||
2019 | 17.40 | a | 17.04 | 23.48 | 32.07 | 32.21 | b | 38.90 | t | 50.23 | r | 48.55 | b | 42.80 | 24.14 | b | 23.13 | 22.23 | 28.30 | b | ||||||
2020 | 20.97 | 12.52 | 24.74 | 24.97 | 37.26 | 44.43 | 50.39 | 48.97 | 40.30 | 29.10 | 25.80 | 18.77 | 31.52 | |||||||||||||
2021 | 18.16 | 10.68 | 22.55 | 28.13 | 37.45 | 46.97 | 52.06 | 49.94 | 42.53 | 33.16 | 28.60 | 23.52 | 32.81 | |||||||||||||
2022 | 16.32 | 12.61 | 23.19 | 27.90 | 36.13 | 45.93 | 53.97 | 51.81 | 42.83 | a | 31.45 | 17.20 | 16.06 | 31.28 | ||||||||||||
2023 | 15.61 | 15.07 | 17.16 | 24.27 | 36.87 | 42.10 | 48.45 | 48.52 | 40.80 | 30.81 | 22.38 | f | 21.48 | 31.01 | a | |||||||||||
2024 | 13.26 | 18.32 | a | 21.32 | 27.63 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 17.63 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.76 | 16.25 | 22.72 | 27.79 | 35.98 | 44.43 | 50.81 | 48.50 | 41.12 | 31.78 | 24.45 | 17.80 | 31.77 | |||||||||||||
S.D. | 3.73 | 3.80 | 2.97 | 2.25 | 1.82 | 2.17 | 1.76 | 2.19 | 2.42 | 3.32 | 2.65 | 3.28 | 0.89 | |||||||||||||
SKEW | -0.83 | 0.60 | -0.45 | -0.37 | -0.28 | -0.08 | -0.56 | -1.03 | -0.09 | -0.32 | -0.59 | -0.19 | -0.20 | |||||||||||||
MAX | 23.29 | 24.71 | 27.43 | 32.07 | 39.03 | 48.80 | 53.97 | 51.81 | 46.77 | 38.26 | 28.60 | 23.52 | 33.20 | |||||||||||||
MIN | 7.39 | 10.68 | 16.23 | 22.97 | 32.21 | 40.13 | 46.68 | 42.19 | 36.45 | 24.14 | 17.20 | 10.94 | 29.85 | |||||||||||||
YRS | 24 | 24 | 25 | 24 | 23 | 24 | 23 | 24 | 25 | 24 | 22 | 23 | 19 |