YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 84.48 | 77.94 | 71.07 | 59.32 | 49.87 | 42.77 | 64.24 | f | ||||||
1940 | 30.68 | 37.55 | 45.97 | 54.13 | 67.10 | 77.87 | 80.40 | a | 78.43 | a | 70.13 | 62.10 | 40.27 | 38.67 | a | 56.94 | ||||||||||
1941 | 30.17 | a | 40.68 | 42.61 | 50.63 | 66.87 | 70.63 | 78.84 | 76.19 | 69.23 | 58.07 | a | 46.00 | 37.23 | 55.60 | |||||||||||
1942 | 27.48 | 25.79 | 37.57 | a | 54.57 | 63.85 | d | 72.03 | 78.55 | 77.55 | 70.24 | a | 59.19 | 47.60 | 33.24 | b | 53.97 | |||||||||
1943 | 33.00 | 38.70 | a | 41.77 | a | 61.89 | b | 61.71 | 72.07 | 79.97 | 78.68 | c | 73.73 | 60.94 | 47.27 | 34.13 | 56.99 | |||||||||
1944 | 31.48 | 38.14 | 38.87 | 48.63 | 63.42 | 72.67 | 78.68 | 81.26 | 74.83 | 62.97 | 47.53 | 36.26 | 56.23 | |||||||||||||
1945 | 35.06 | 39.61 | 44.61 | 47.67 | 64.74 | 68.20 | 78.90 | 78.81 | 73.43 | 64.45 | 44.03 | 32.30 | a | 55.99 | ||||||||||||
1946 | 30.58 | 38.75 | 50.94 | 61.43 | 61.55 | 78.10 | 82.06 | 80.42 | 75.93 | 59.42 | 42.27 | 41.35 | 58.57 | |||||||||||||
1947 | 33.29 | 42.07 | 44.97 | 54.40 | 67.77 | 72.27 | 81.65 | 79.84 | 76.73 | 63.61 | 35.80 | 31.58 | 57.00 | |||||||||||||
1948 | 28.84 | 32.62 | 37.03 | a | 54.53 | 65.58 | 73.63 | 79.65 | 76.30 | a | 74.60 | 59.71 | 36.83 | 31.03 | 54.20 | |||||||||||
1949 | 19.10 | 29.89 | 43.48 | 56.33 | 62.35 | 71.40 | 77.06 | 77.23 | 70.57 | 56.00 | a | 53.00 | 35.48 | 54.33 | ||||||||||||
1950 | 33.81 | 36.04 | 41.06 | 54.37 | 61.00 | 74.90 | a | 75.48 | 75.06 | 67.60 | 67.48 | 47.13 | 35.73 | a | 55.81 | |||||||||||
1951 | 30.67 | a | 37.00 | a | 41.65 | 51.30 | 63.16 | 68.73 | 81.52 | 77.68 | 73.33 | 56.55 | 40.70 | 32.52 | b | 54.57 | ||||||||||
1952 | 25.61 | 29.03 | 35.29 | 53.30 | 63.77 | 77.80 | 76.17 | a | 75.03 | a | 76.00 | 67.03 | 35.33 | 25.26 | 53.30 | |||||||||||
1953 | 37.39 | 33.21 | 46.61 | 50.13 | 60.03 | 78.77 | 81.86 | b | 78.65 | 74.76 | a | 61.00 | 47.97 | 33.45 | 56.99 | |||||||||||
1954 | 41.77 | 46.96 | 43.84 | 63.00 | 68.90 | 79.86 | a | 85.48 | 81.23 | a | 73.17 | a | 61.20 | a | 48.77 | 29.13 | a | 60.28 | ||||||||
1955 | 25.62 | b | 27.37 | a | 41.06 | 53.10 | 64.90 | 70.24 | a | 80.61 | 77.50 | a | 74.53 | 63.68 | 41.80 | 38.26 | 54.89 | |||||||||
1956 | 38.55 | 28.50 | a | 42.87 | 55.69 | a | 69.68 | 80.93 | 81.29 | 76.97 | 77.43 | 64.00 | 40.23 | 29.23 | a | 57.11 | ||||||||||
1957 | 29.81 | 40.93 | 42.10 | a | 50.45 | a | 59.87 | 72.07 | a | 79.29 | 78.61 | 72.07 | 60.32 | 40.30 | 36.23 | 55.17 | ||||||||||
1958 | 27.48 | 41.14 | 41.10 | 50.97 | 69.29 | 79.43 | 80.35 | 82.55 | 75.33 | 64.48 | 47.47 | 39.19 | 58.23 | |||||||||||||
1959 | 34.52 | 36.61 | 42.23 | 52.57 | 64.77 | 78.83 | 81.84 | 78.03 | 69.20 | 57.70 | a | 44.93 | a | 37.58 | 56.57 | |||||||||||
1960 | 33.43 | a | 30.45 | 45.68 | 57.47 | 64.77 | 78.03 | a | 82.45 | 82.48 | 74.30 | 60.71 | 47.53 | 33.00 | 57.53 | |||||||||||
1961 | 32.42 | 40.46 | 45.74 | 51.17 | 66.16 | 77.53 | 80.55 | 79.84 | 64.48 | a | 60.83 | a | 42.50 | 31.77 | 56.12 | |||||||||||
1962 | 20.87 | 36.36 | f | 38.32 | 58.47 | 64.81 | 74.20 | 79.61 | 81.17 | a | 74.10 | 65.61 | 50.97 | 36.97 | 58.64 | a | ||||||||||
1963 | 26.77 | 41.32 | 44.39 | 58.47 | 70.58 | 75.85 | d | 85.10 | b | 78.39 | c | 77.27 | 69.10 | 48.50 | 33.35 | 59.09 | ||||||||||
1964 | 26.71 | 27.41 | 36.13 | 52.17 | 66.90 | 74.00 | 84.71 | 76.77 | a | 71.67 | 63.33 | a | 43.77 | 32.35 | 54.66 | |||||||||||
1965 | 31.65 | 33.11 | 32.58 | 53.03 | 62.35 | 72.30 | 78.06 | 75.45 | 64.70 | 65.39 | 47.17 | 34.65 | 54.20 | |||||||||||||
1966 | 30.13 | 32.50 | 48.74 | 55.97 | 67.10 | 73.93 | 83.13 | 79.23 | a | 72.37 | 57.81 | 49.37 | 22.10 | 56.03 | ||||||||||||
1967 | 32.23 | 32.46 | 48.84 | 57.23 | 60.90 | 69.20 | 79.29 | 76.81 | 71.86 | a | 61.61 | 46.57 | 28.60 | a | 55.47 | |||||||||||
1968 | 26.74 | 33.31 | 42.13 | 49.03 | 61.13 | 75.70 | 78.81 | 73.74 | 69.23 | 61.58 | 35.57 | 32.58 | 53.30 | |||||||||||||
1969 | 38.67 | a | 32.61 | 36.94 | 58.10 | 68.61 | 68.33 | 82.06 | 81.55 | 72.17 | 50.23 | 39.93 | a | 34.13 | 55.28 | |||||||||||
1970 | 30.81 | 37.79 | 39.84 | 47.17 | 66.65 | 72.90 | 79.74 | 80.45 | 68.17 | 50.68 | 42.60 | 34.16 | 54.25 | |||||||||||||
1971 | 34.77 | 34.54 | 42.32 | 54.60 | 62.29 | 75.33 | 79.48 | 79.77 | 67.28 | a | 59.74 | 42.27 | 28.00 | 55.03 | ||||||||||||
1972 | 31.16 | 39.59 | 49.84 | 55.53 | 65.06 | 74.73 | 79.39 | 76.74 | 68.20 | 57.48 | 36.90 | 26.68 | 55.11 | |||||||||||||
1973 | 24.10 | a | 29.71 | 40.45 | 47.93 | 62.65 | 72.67 | 75.35 | 77.71 | 68.69 | a | 62.26 | 45.30 | 32.74 | 53.30 | |||||||||||
1974 | 27.10 | 29.96 | 48.00 | 51.83 | 69.00 | 75.20 | 78.84 | 76.87 | 70.53 | 60.74 | 43.70 | 27.10 | 54.91 | |||||||||||||
1975 | 31.68 | 31.54 | 43.50 | a | 49.83 | 61.39 | 71.33 | 79.48 | 77.45 | 69.43 | 62.29 | 41.60 | 34.77 | 54.53 | ||||||||||||
1976 | 31.19 | 39.57 | a | 39.74 | 53.97 | a | 62.26 | 71.33 | 80.58 | 77.35 | 69.20 | 58.10 | 43.80 | 32.74 | 54.99 | |||||||||||
1977 | 32.10 | 38.57 | 42.19 | 57.20 | 66.16 | 79.97 | 80.61 | 77.61 | 73.07 | 60.94 | 44.97 | 36.77 | 57.51 | |||||||||||||
1978 | 32.13 | 35.54 | 45.74 | 56.93 | 62.45 | 75.57 | 81.94 | 78.13 | 71.23 | 62.19 | 46.03 | 27.55 | 56.29 | |||||||||||||
1979 | 21.58 | 34.07 | 41.00 | 53.80 | 61.97 | 74.33 | 80.94 | 77.13 | 76.10 | 63.45 | 33.97 | 27.55 | 53.82 | |||||||||||||
1980 | 32.58 | 35.14 | 40.42 | 49.40 | 62.65 | 79.27 | 81.39 | 77.40 | a | 71.60 | 58.84 | 44.87 | 42.65 | 56.35 | ||||||||||||
1981 | 36.57 | a | 39.54 | 41.55 | 59.70 | 60.00 | 76.10 | a | 76.97 | 75.71 | 70.29 | b | 55.42 | 48.43 | 35.00 | 56.27 | ||||||||||
1982 | 30.86 | c | 31.39 | 42.52 | 49.03 | a | 58.68 | 69.27 | 78.00 | 77.10 | 65.93 | 51.32 | 36.67 | 27.97 | 51.56 | |||||||||||
1983 | 29.37 | a | 34.50 | 38.42 | 44.73 | 55.71 | 68.23 | 74.94 | 77.39 | 68.40 | 56.65 | 41.23 | 30.22 | d | 51.65 | |||||||||||
1984 | 16.68 | 25.66 | 37.87 | a | 44.20 | 63.10 | 67.43 | 73.42 | 73.48 | 67.80 | 46.37 | a | 39.97 | 32.23 | 49.02 | |||||||||||
1985 | 25.41 | b | 29.74 | a | 41.55 | 53.60 | 62.13 | 75.37 | 76.90 | 77.87 | ----- | z | 53.58 | 34.21 | a | 27.39 | 50.70 | a | ||||||||
1986 | 29.27 | a | 34.96 | 46.81 | 51.23 | 62.42 | 75.70 | ----- | z | ----- | z | 62.17 | a | 50.61 | 37.03 | 31.61 | 48.18 | b | ||||||||
1987 | 29.39 | 38.11 | 41.97 | 56.77 | 63.41 | b | 75.33 | 79.16 | 75.81 | 67.60 | 58.00 | 38.43 | b | ----- | z | 56.72 | a | |||||||||
1988 | 21.84 | 28.97 | 35.13 | 51.73 | 59.45 | 73.67 | 80.00 | 78.29 | 66.07 | 58.97 | 37.57 | 22.94 | 51.22 | |||||||||||||
1989 | 22.73 | a | 27.54 | 44.03 | a | 53.17 | 61.97 | 68.47 | 77.48 | 72.19 | 68.33 | 53.00 | 39.03 | 25.87 | 51.15 | |||||||||||
1990 | 29.60 | a | 33.89 | 41.58 | 50.50 | 57.84 | 75.23 | 72.45 | 72.68 | 68.00 | 52.58 | 44.83 | 29.53 | a | 52.39 | |||||||||||
1991 | 28.13 | 38.25 | 44.97 | 51.07 | 66.93 | a | 74.77 | 78.65 | 74.35 | 66.30 | 57.26 | 39.29 | b | 29.94 | 54.16 | |||||||||||
1992 | 27.42 | 37.72 | 45.39 | 59.33 | 65.71 | 70.83 | 75.19 | 76.10 | 69.87 | 61.61 | 33.20 | 30.10 | 54.37 | |||||||||||||
1993 | 28.25 | c | 28.11 | 38.03 | 45.83 | 57.41 | d | 65.59 | a | 73.03 | a | 70.03 | 62.77 | 49.52 | 31.79 | a | 25.84 | 48.02 | ||||||||
1994 | 29.23 | 30.36 | 41.03 | 48.77 | 67.19 | 78.13 | 81.45 | 78.90 | 72.10 | a | 57.16 | 39.23 | 33.29 | 54.74 | ||||||||||||
1995 | 26.24 | b | ----- | z | 43.29 | 47.00 | 53.85 | d | 68.87 | 76.31 | o | 81.25 | k | 71.11 | b | 54.80 | a | 46.97 | a | 32.94 | 49.45 | c | ||||
1996 | 28.97 | b | 32.28 | 39.68 | 51.15 | c | 66.74 | 75.17 | 79.39 | c | 80.10 | 66.64 | b | 56.65 | 41.74 | c | 29.17 | b | 53.97 | |||||||
1997 | 23.77 | 31.88 | c | 45.52 | 46.80 | 59.42 | 72.38 | a | 77.97 | 75.06 | 70.13 | 56.48 | 41.64 | b | 29.61 | 52.56 | ||||||||||
1998 | 34.10 | 33.89 | 41.13 | 48.30 | 65.66 | b | 68.60 | 79.81 | 76.81 | ----- | z | 54.13 | 43.14 | a | 29.53 | a | 52.28 | a | ||||||||
1999 | 33.40 | a | 37.32 | 48.29 | 47.40 | 59.26 | 71.40 | 76.32 | 73.81 | 64.27 | 58.90 | 51.07 | a | 31.17 | a | 54.38 | ||||||||||
2000 | 34.00 | a | 37.66 | 43.58 | 57.80 | 68.79 | c | 73.70 | 80.27 | a | 77.23 | 69.27 | 56.90 | 30.17 | 28.35 | 54.81 | ||||||||||
2001 | 24.26 | 35.57 | 42.23 | 52.77 | 61.35 | 73.37 | 78.86 | c | 75.23 | 68.70 | 56.03 | 42.23 | 29.13 | 53.31 | ||||||||||||
2002 | 27.93 | c | 29.19 | a | 39.70 | a | 55.30 | 62.27 | e | 78.67 | 84.10 | 77.94 | 66.66 | a | 51.50 | a | 32.87 | 27.81 | 52.83 | |||||||
2003 | 34.81 | 32.52 | a | 36.54 | g | 49.50 | 60.07 | a | 69.00 | 84.18 | c | 76.32 | 66.36 | b | 59.23 | 34.97 | 30.97 | 54.36 | a | |||||||
2004 | 26.39 | c | 30.66 | 47.14 | c | 52.20 | 62.13 | 70.43 | 75.06 | 74.28 | f | 66.62 | d | 54.42 | 38.83 | 22.87 | 49.71 | a | ||||||||
2005 | 30.17 | a | 29.77 | b | 38.71 | 51.63 | 61.42 | 66.43 | g | 81.87 | 73.00 | c | 67.87 | 53.45 | 35.23 | 22.66 | b | 49.62 | a | |||||||
2006 | 24.03 | 25.64 | 37.16 | 52.21 | a | 61.23 | 73.73 | 74.87 | 69.84 | 56.00 | a | 44.26 | 36.67 | 22.71 | 48.20 | |||||||||||
2007 | 17.43 | c | 32.93 | 40.45 | 46.27 | 56.84 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.27 | 25.76 | b | 37.99 | e | |||||
2008 | 21.73 | a | 28.93 | 37.23 | 46.53 | 58.94 | 75.40 | 83.29 | 77.67 | g | 71.07 | b | 60.12 | o | 43.68 | b | 31.24 | j | 51.87 | c | ||||||
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2020 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 29.36 | 34.14 | 42.10 | 52.65 | 63.28 | 73.69 | 79.54 | 77.25 | 70.15 | 58.54 | 42.13 | 31.55 | 54.74 | |||||||||||||
S.D. | 4.97 | 4.71 | 3.77 | 4.26 | 3.56 | 3.60 | 2.92 | 2.63 | 3.98 | 4.97 | 5.24 | 4.74 | 2.41 | |||||||||||||
SKEW | -0.27 | 0.19 | 0.04 | 0.25 | -0.11 | -0.03 | -0.27 | -0.50 | -0.56 | -0.49 | -0.19 | 0.15 | -0.62 | |||||||||||||
MAX | 41.77 | 46.96 | 50.94 | 63.00 | 70.58 | 80.93 | 85.48 | 82.55 | 77.43 | 69.10 | 53.00 | 42.77 | 60.28 | |||||||||||||
MIN | 16.68 | 25.64 | 32.58 | 44.20 | 53.85 | 65.59 | 72.45 | 69.84 | 56.00 | 44.26 | 30.17 | 22.10 | 48.02 | |||||||||||||
YRS | 69 | 67 | 68 | 69 | 69 | 67 | 67 | 65 | 67 | 68 | 70 | 68 | 58 |