Cheyenne River Reservation, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 29° -40° (1966) 67° (1981) 0.32" 5.7"
February 13° 33° -32° (1996) 73° (1982) 0.48" 6.4"
March 22° 43° -30° (1980) 85° (1967) 1.09" 7.4"
April 34° 58° 1° (1997) 97° (1980) 1.52" 5.9"
May 45° 68° 18° (1967) 104° (1969) 3.08" 0.2"
June 54° 78° 30° (1969) 111° (2002) 3.34" 0"
July 61° 87° 35° (1971) 114° (2006) 2.68" 0"
August 59° 87° 35° (1977) 111° (1988) 1.85" 0"
September 48° 75° 13° (1984) 106° (1983) 1.49" 0.1"
October 35° 61° -5° (1991) 97° (1963) 1.63" 1.6"
November 22° 43° -18° (1985) 83° (1999) 0.59" 5.8"
December 11° 31° -33° (1967) 72° (1965) 0.41" 6.6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 54° 82° 32° (1981) 106° (1983) 0.04" 0"
Sep 2 54° 82° 32° (1974) 106° (1971) 0.05" 0"
Sep 3 53° 81° 29° (1974) 100° (1978) 0.04" 0"
Sep 4 53° 81° 35° (1974) 102° (1978) 0.04" 0"
Sep 5 53° 80° 31° (1965) 105° (1978) 0.05" 0"
Sep 6 52° 80° 37° (1966) 105° (1978) 0.05" 0"
Sep 7 52° 80° 39° (1964) 101° (1978) 0.05" 0"
Sep 8 51° 79° 36° (1972) 101° (2002) 0.04" 0"
Sep 9 51° 79° 29° (1976) 103° (1979) 0.05" 0"
Sep 10 50° 78° 36° (1964) 101° (1982) 0.05" 0"
Sep 11 50° 78° 30° (1989) 103° (1998) 0.04" 0"
Sep 12 50° 77° 28° (1964) 97° (1981) 0.05" 0"
Sep 13 49° 77° 30° (1978) 96° (1990) 0.04" 0"
Sep 14 49° 76° 26° (1993) 95° (1968) 0.05" 0"
Sep 15 48° 76° 31° (1982) 92° (1997) 0.05" 0"
Sep 16 48° 75° 31° (1979) 98° (1979) 0.04" 0"
Sep 17 47° 75° 25° (1973) 96° (2002) 0.05" 0"
Sep 18 47° 74° 25° (1991) 101° (2000) 0.04" 0"
Sep 19 46° 74° 27° (1991) 101° (1998) 0.05" 0"
Sep 20 46° 73° 28° (1964) 90° (1969) 0.05" 0"
Sep 21 45° 73° 25° (1995) 91° (1984) 0.05" 0"
Sep 22 45° 72° 22° (1983) 90° (1967) 0.05" 0"
Sep 23 45° 72° 25° (1983) 95° (2007) 0.06" 0.1"
Sep 24 44° 71° 17° (1965) 92° (2007) 0.06" 0"
Sep 25 44° 71° 30° (1984) 95° (1992) 0.06" 0"
Sep 26 43° 70° 20° (1984) 95° (1974) 0.05" 0"
Sep 27 43° 70° 21° (1964) 93° (1990) 0.06" 0"
Sep 28 42° 69° 21° (1974) 92° (1989) 0.06" 0"
Sep 29 42° 69° 13° (1984) 88° (1995) 0.06" 0"
Sep 30 41° 69° 16° (1974) 96° (1967) 0.06" 0"
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