Duncan, Oklahoma
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 27° 50° -4° (1988) 84° (1950) 1.4" NA
February 32° 56° -2° (1985) 90° (1996) 1.86" NA
March 40° 64° 2° (1948) 95° (1974) 2.79" NA
April 49° 73° 26° (1997) 100° (1972) 3.39" NA
May 58° 80° 34° (1960) 104° (2000) 5.27" NA
June 67° 88° 47° (1964) 111° (1980) 4.52" NA
July 71° 94° 55° (1972) 110° (1980) 2.52" NA
August 70° 93° 55° (1992) 111° (1970) 2.5" NA
September 62° 85° 38° (1984) 108° (2000) 3.99" NA
October 51° 75° 19° (1993) 102° (1977) 3.87" NA
November 39° 62° 14° (1993) 87° (1992) 2.34" NA
December 30° 52° -7° (1989) 88° (1955) 1.96" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 54° 77° 34° (1960) 97° (1948) 0.14" NA
May 2 54° 77° 40° (1970) 97° (1948) 0.15" NA
May 3 54° 77° 35° (1954) 96° (1964) 0.15" NA
May 4 54° 77° 37° (1954) 94° (1964) 0.15" NA
May 5 55° 78° 41° (1978) 93° (2003) 0.15" NA
May 6 55° 78° 41° (1979) 91° (1962) 0.16" NA
May 7 55° 78° 42° (1960) 94° (1955) 0.16" NA
May 8 56° 78° 41° (1984) 95° (1955) 0.16" NA
May 9 56° 79° 45° (1961) 92° (2000) 0.16" NA
May 10 56° 79° 44° (1997) 99° (1963) 0.17" NA
May 11 57° 79° 42° (1952) 99° (1980) 0.17" NA
May 12 57° 79° 41° (1979) 98° (1980) 0.17" NA
May 13 57° 80° 42° (1966) 93° (1956) 0.17" NA
May 14 57° 80° 41° (1975) 94° (1952) 0.17" NA
May 15 58° 80° 43° (1967) 92° (1952) 0.17" NA
May 16 58° 80° 43° (1967) 95° (1963) 0.17" NA
May 17 58° 81° 49° (1970) 98° (1966) 0.18" NA
May 18 59° 81° 46° (1968) 94° (1956) 0.18" NA
May 19 59° 81° 43° (2002) 98° (1973) 0.18" NA
May 20 59° 81° 47° (1981) 98° (1953) 0.18" NA
May 21 60° 82° 50° (1968) 99° (1953) 0.18" NA
May 22 60° 82° 48° (2001) 96° (2005) 0.18" NA
May 23 60° 82° 47° (1967) 98° (2000) 0.18" NA
May 24 61° 82° 53° (1967) 104° (2000) 0.18" NA
May 25 61° 83° 51° (1971) 103° (2000) 0.18" NA
May 26 61° 83° 50° (1992) 98° (1984) 0.18" NA
May 27 61° 83° 48° (2003) 95° (1963) 0.18" NA
May 28 62° 83° 50° (1976) 95° (1963) 0.18" NA
May 29 62° 84° 49° (1984) 97° (1963) 0.18" NA
May 30 62° 84° 48° (1992) 99° (1985) 0.18" NA
May 31 63° 84° 49° (1983) 103° (1985) 0.18" NA
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