YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.35 | t | 77.47 | 74.79 | 70.77 | h | 60.48 | h | 46.28 | a | 35.42 | a | 58.49 | h | ||
1964 | 32.32 | 33.90 | 39.84 | c | 50.28 | 57.94 | d | 69.43 | c | 77.45 | a | 74.58 | 66.12 | 60.42 | 41.02 | d | 36.12 | b | 53.28 | |||||||
1965 | 38.45 | 38.44 | a | 41.71 | 49.07 | 56.71 | b | 64.90 | 74.26 | 73.85 | a | 62.67 | 58.81 | b | 47.03 | 35.62 | b | 53.46 | ||||||||
1966 | 32.82 | 32.48 | a | 47.98 | 53.75 | 64.25 | a | 71.48 | b | 76.55 | 76.82 | 69.08 | 56.82 | 46.95 | 35.45 | 55.37 | ||||||||||
1967 | 32.94 | 39.96 | 47.58 | 46.10 | a | 58.45 | 66.52 | 77.77 | a | 75.90 | 66.57 | 57.20 | a | 47.17 | 28.08 | 53.69 | ||||||||||
1968 | 31.97 | 44.74 | 45.89 | 48.95 | 59.19 | 69.45 | 74.16 | 70.10 | 65.10 | 56.47 | 44.47 | 30.19 | j | 55.50 | a | |||||||||||
1969 | 38.50 | o | 38.33 | m | 42.92 | l | 51.67 | f | 63.42 | a | 67.88 | d | 75.84 | b | ----- | z | 67.37 | 51.52 | c | 43.20 | c | 37.84 | c | 58.15 | e | |
1970 | 33.64 | f | 42.08 | h | 42.46 | e | 45.36 | e | 61.85 | g | 68.82 | e | 76.38 | b | 75.73 | 64.04 | e | 50.64 | f | 43.08 | d | 34.37 | a | 56.28 | d | |
1971 | 34.93 | d | 38.30 | c | 44.00 | a | 50.98 | a | 56.79 | 70.28 | c | 78.39 | c | 74.85 | 66.12 | a | 51.53 | a | 41.88 | b | 30.88 | a | 53.24 | |||
1972 | 34.38 | b | 40.79 | a | 50.87 | 53.48 | 60.82 | 70.52 | a | 78.48 | 73.06 | 64.75 | 54.02 | 39.25 | 31.10 | 54.29 | ||||||||||
1973 | 23.57 | a | 36.94 | a | 40.11 | 48.47 | 62.23 | 69.45 | a | 75.08 | 73.17 | b | 65.50 | b | 55.02 | e | 43.98 | 38.13 | e | 52.64 | ||||||
1974 | 31.47 | 37.86 | 48.84 | 51.17 | 65.04 | e | 74.08 | 75.67 | a | 73.43 | d | 69.34 | e | 58.34 | 44.66 | a | 34.08 | 55.33 | ||||||||
1975 | 34.35 | 38.11 | 42.27 | a | 45.92 | 57.29 | e | 68.69 | d | 76.21 | 72.47 | b | 68.69 | f | 56.10 | e | 42.43 | 37.45 | a | 51.93 | a | |||||
1976 | 37.76 | 43.38 | 43.13 | a | 50.21 | f | 63.16 | b | 68.96 | c | 77.53 | a | 74.35 | a | ----- | z | 54.90 | 45.43 | a | 36.69 | 54.53 | b | ||||
1977 | 34.27 | 41.61 | 41.56 | 54.61 | b | 57.04 | c | 72.95 | 77.55 | 75.66 | 69.34 | e | 57.72 | a | 43.90 | a | 38.76 | 55.41 | ||||||||
1978 | 35.10 | a | 37.14 | 46.97 | 50.57 | b | 57.88 | b | 68.95 | a | 74.89 | 73.29 | 64.93 | 59.32 | 43.87 | 29.20 | a | 53.51 | ||||||||
1979 | 27.55 | a | 31.86 | 43.81 | 51.62 | 59.86 | c | 69.86 | b | 76.27 | 71.90 | 70.73 | 59.65 | 42.00 | 38.18 | 53.61 | ||||||||||
1980 | 38.58 | a | 42.38 | 42.24 | 53.23 | 57.31 | 68.98 | ----- | z | 74.21 | 68.05 | 55.82 | 45.70 | 43.55 | 53.64 | a | ||||||||||
1981 | 41.34 | 42.57 | 45.02 | 57.00 | a | 60.95 | b | 74.55 | 78.10 | 75.00 | b | 68.77 | f | 53.17 | h | 49.02 | b | 40.34 | b | 56.39 | b | |||||
1982 | 32.84 | 38.16 | c | 43.73 | 50.12 | a | 59.71 | 67.42 | d | 74.53 | a | 72.15 | 66.29 | d | 51.85 | g | 41.26 | i | 34.78 | b | 53.97 | b | ||||
1983 | 36.53 | 41.11 | 44.48 | 46.81 | a | 57.43 | a | 68.92 | 75.30 | d | 74.12 | a | 69.52 | a | 56.79 | 43.22 | a | 38.48 | b | 54.39 | ||||||
1984 | 36.78 | a | 38.17 | 44.45 | b | 50.61 | g | 66.97 | a | 70.12 | a | 77.02 | 75.06 | 69.23 | b | 50.32 | c | 43.84 | a | 35.57 | a | 55.23 | a | |||
1985 | 35.19 | b | 36.41 | 44.52 | a | 56.33 | 63.02 | 72.57 | 77.98 | c | 75.76 | 63.85 | c | 56.58 | a | 38.74 | a | 37.89 | 54.90 | |||||||
1986 | 43.32 | a | 43.62 | 50.53 | 54.43 | b | 62.80 | c | 73.08 | 75.22 | b | 76.60 | a | 62.57 | a | 54.55 | 45.52 | a | 36.89 | d | 56.59 | |||||
1987 | 32.42 | e | ----- | z | 41.84 | b | 55.19 | a | 61.80 | a | 72.30 | b | 73.18 | a | 73.50 | b | 67.81 | f | 58.48 | b | 43.61 | b | 32.76 | b | 54.51 | b |
1988 | 34.12 | c | 42.30 | b | 44.05 | c | 53.33 | 60.23 | a | 71.69 | d | 78.79 | e | 73.81 | m | 65.17 | 61.10 | b | 44.44 | c | 32.12 | b | 53.40 | a | ||
1989 | 28.80 | c | 37.83 | b | 49.91 | c | 58.81 | a | 62.18 | a | 70.91 | b | 78.46 | e | 72.33 | d | 67.52 | e | 55.60 | b | 44.93 | b | 36.72 | a | 55.33 | |
1990 | 35.80 | a | 37.02 | d | 49.07 | b | 54.75 | d | 62.39 | c | 74.46 | c | 77.36 | f | 74.45 | c | 69.38 | d | 56.20 | c | 44.58 | d | 29.08 | e | 53.38 | a |
1991 | 33.04 | d | 44.40 | b | 43.32 | f | 50.54 | c | 59.30 | d | 68.17 | 77.27 | 76.32 | a | 68.33 | a | 58.11 | 43.53 | a | 35.10 | 55.83 | a | ||||
1992 | 31.65 | 42.78 | 46.98 | a | 57.58 | 62.90 | b | 70.07 | a | 74.50 | 75.03 | b | 67.93 | b | 58.47 | 39.66 | b | 31.32 | c | 54.91 | ||||||
1993 | 36.50 | b | 39.41 | 47.94 | 53.00 | b | 62.39 | 68.22 | 74.94 | 74.29 | 66.02 | a | 55.28 | b | 40.64 | e | 34.59 | d | 54.43 | |||||||
1994 | 37.05 | b | 37.21 | 48.94 | 52.97 | 62.08 | a | 74.46 | b | 79.18 | a | 78.67 | e | 69.36 | b | 52.97 | a | 36.65 | c | 36.37 | d | 55.49 | ||||
1995 | 35.72 | b | 45.98 | c | 46.24 | d | 49.73 | f | 56.86 | c | 65.28 | c | 74.14 | f | 76.02 | c | 68.68 | b | 54.95 | b | 47.90 | f | 39.80 | p | 56.22 | d |
1996 | 36.71 | j | 43.65 | f | 46.43 | d | 53.06 | c | 63.43 | d | 73.79 | b | 79.94 | d | 77.78 | b | 65.73 | b | 54.00 | e | 43.67 | c | 37.06 | d | 59.49 | b |
1997 | 34.17 | h | 38.12 | d | 48.66 | c | 50.11 | b | 64.80 | c | 70.46 | d | 73.97 | b | 75.05 | a | 68.03 | a | 53.89 | c | 44.80 | c | 34.55 | c | 56.59 | a |
1998 | 36.32 | f | 36.85 | e | 43.60 | e | 46.46 | d | 57.54 | f | 66.92 | d | 77.22 | b | 76.20 | a | 67.02 | b | 53.15 | d | 42.31 | d | 36.29 | e | 54.60 | b |
1999 | 37.07 | d | 40.46 | e | 47.91 | h | 47.46 | b | 60.11 | d | 70.63 | c | 74.96 | d | 74.76 | 66.48 | c | 58.25 | a | 49.09 | c | 34.43 | d | 55.79 | a | |
2000 | 37.64 | c | 42.08 | d | 45.88 | b | 56.76 | e | 65.82 | 72.31 | c | 77.15 | 76.76 | b | 68.79 | b | 54.71 | c | 37.10 | d | 37.38 | b | 56.03 | |||
2001 | 34.26 | b | 39.31 | a | 46.23 | a | 52.10 | e | 63.24 | b | 70.69 | a | 75.82 | c | 75.94 | 69.38 | a | 58.63 | a | 45.07 | b | 31.52 | f | 57.33 | a | |
2002 | 33.00 | 37.98 | c | 40.78 | b | 56.08 | d | 61.45 | a | 73.19 | a | 79.79 | b | 75.73 | 67.31 | d | 53.14 | f | 43.71 | f | 34.20 | h | 58.37 | c | ||
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.38 | e | 80.74 | d | 77.78 | d | 70.70 | b | 63.07 | d | 40.82 | e | 36.89 | c | 63.20 | e |
2004 | 35.23 | c | 35.27 | c | 52.40 | a | 53.52 | a | 62.79 | b | 72.30 | e | 77.82 | t | 76.17 | m | 63.87 | o | 55.43 | a | 42.43 | b | 36.59 | b | 49.55 | c |
2005 | 39.75 | a | 40.45 | 44.93 | c | 51.05 | a | 61.79 | c | 67.80 | 78.88 | b | 73.55 | 66.95 | b | 56.37 | 46.05 | a | 35.16 | c | 55.23 | |||||
2006 | 36.55 | 39.60 | c | 42.00 | a | 53.72 | 62.29 | b | 69.92 | 79.65 | 73.80 | a | 65.08 | 53.94 | 45.75 | 34.35 | a | 54.72 | ||||||||
2007 | 31.90 | b | 41.23 | 48.24 | 54.27 | 63.79 | b | 72.12 | a | 80.67 | a | 77.02 | a | 69.34 | a | 55.87 | a | 49.67 | a | 35.57 | a | 56.64 | ||||
2008 | 33.83 | a | 39.84 | a | 45.69 | 53.53 | 60.26 | 70.32 | b | 78.24 | 77.35 | 67.86 | a | 56.11 | 47.70 | b | 31.95 | a | 55.22 | |||||||
2009 | 36.30 | a | 39.93 | 45.73 | 50.70 | 65.94 | 68.41 | a | 79.52 | 74.53 | 69.75 | 52.95 | 47.62 | b | 29.65 | a | 55.09 | |||||||||
2010 | 34.07 | b | 35.88 | 44.27 | 50.57 | 56.18 | 71.67 | 79.11 | 75.81 | 68.98 | a | 57.53 | 41.45 | a | 39.00 | a | 54.54 | |||||||||
2011 | 34.12 | a | 34.93 | 45.06 | 50.78 | 56.19 | 69.42 | 76.40 | 77.90 | 69.08 | 55.87 | 42.26 | a | 34.13 | 53.85 | |||||||||||
2012 | 37.69 | 38.86 | 46.95 | b | 54.92 | 64.37 | 73.85 | 77.11 | 76.74 | 68.45 | 57.63 | 47.43 | a | 35.55 | b | 56.63 | ||||||||||
2013 | 30.27 | a | 35.88 | 48.66 | 52.55 | 62.48 | 75.30 | 79.23 | 75.07 | a | 66.77 | 52.36 | q | 44.69 | a | 31.22 | a | 54.74 | a | |||||||
2014 | 38.83 | a | 41.62 | 47.06 | 53.59 | a | 62.44 | 73.23 | 78.95 | 72.15 | 69.66 | a | 58.65 | 45.53 | a | 38.10 | a | 56.65 | ||||||||
2015 | 37.85 | a | 44.59 | 49.79 | 52.20 | 58.42 | 74.25 | 74.28 | b | 75.23 | 69.78 | 59.47 | 41.91 | a | 32.73 | a | 55.87 | |||||||||
2016 | 34.15 | a | 43.33 | b | 48.15 | 52.17 | 60.39 | 75.72 | 78.79 | 74.05 | 65.28 | 59.85 | a | 47.72 | a | 36.07 | a | 56.31 | ||||||||
2017 | 33.38 | a | 42.50 | a | 51.03 | 53.03 | 60.55 | 74.53 | 79.68 | 74.92 | 67.43 | 56.45 | 50.63 | 38.82 | 56.91 | |||||||||||
2018 | 41.17 | d | 38.45 | 45.63 | 58.08 | 62.73 | 74.86 | l | ----- | z | ----- | z | ----- | z | 53.42 | m | 43.14 | l | 37.24 | l | 49.21 | g | ||||
2019 | ----- | z | 31.96 | b | 45.57 | a | 54.41 | b | 53.93 | c | 69.72 | 77.32 | c | 77.85 | 70.86 | a | ----- | z | ----- | z | ----- | z | 60.20 | d | ||
2020 | 38.56 | v | 38.66 | 46.15 | a | 53.80 | b | 64.77 | a | ----- | z | ----- | z | ----- | z | 68.29 | w | 58.36 | c | 46.96 | b | 33.75 | a | 48.92 | e | |
2021 | 35.28 | a | 38.89 | 43.22 | b | 55.38 | 62.63 | a | 76.97 | 81.02 | e | 77.47 | a | 71.00 | 53.52 | 49.35 | d | 37.23 | a | 56.83 | ||||||
2022 | 37.20 | d | 38.08 | c | 45.15 | 54.18 | 62.16 | 72.00 | a | 79.22 | f | 76.59 | b | 73.19 | d | 57.54 | e | 39.64 | l | 35.15 | u | 57.34 | c | |||
2023 | 34.40 | 38.70 | a | 39.29 | s | 50.54 | e | 61.94 | 67.25 | 80.00 | 76.62 | g | 67.08 | 56.19 | m | 46.52 | 40.79 | b | 54.14 | c | ||||||
2024 | 35.60 | b | 39.81 | 42.72 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.71 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 34.93 | 39.25 | 45.71 | 52.35 | 61.11 | 70.84 | 77.28 | 75.04 | 67.61 | 56.43 | 44.31 | 35.37 | 55.01 | |||||||||||||
S.D. | 3.40 | 3.18 | 2.94 | 3.14 | 2.88 | 2.68 | 2.01 | 1.78 | 2.23 | 2.57 | 3.06 | 3.11 | 1.20 | |||||||||||||
SKEW | -0.45 | -0.20 | 0.09 | -0.31 | -0.34 | 0.05 | -0.10 | -0.26 | -0.16 | -0.03 | -0.29 | -0.23 | -0.09 | |||||||||||||
MAX | 43.32 | 45.98 | 52.40 | 58.81 | 66.97 | 76.97 | 81.02 | 78.67 | 73.19 | 63.07 | 50.63 | 43.55 | 56.91 | |||||||||||||
MIN | 23.57 | 31.86 | 39.84 | 45.36 | 53.93 | 64.90 | 73.18 | 70.10 | 62.57 | 50.32 | 36.65 | 28.08 | 52.64 | |||||||||||||
YRS | 53 | 56 | 55 | 55 | 57 | 58 | 54 | 55 | 53 | 52 | 55 | 54 | 32 |