Sinai, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 26° -34° (1972) 66° (1981) 0.51" 6.7"
February 12° 32° -34° (1994) 68° (2000) 0.73" 5.7"
March 23° 43° -23° (1948) 85° (1968) 1.45" 6.2"
April 35° 59° 0° (1975) 95° (1980) 2.53" 4.2"
May 47° 71° 17° (1967) 99° (1967) 3.1" 0.2"
June 57° 79° 34° (1969) 104° (1988) 4.42" 0"
July 62° 84° 37° (1971) 107° (1976) 3.29" 0"
August 60° 81° 35° (1964) 105° (1973) 2.96" 0"
September 50° 73° 22° (1951) 103° (1976) 3.07" 0"
October 37° 60° 9° (1976) 92° (1980) 2.07" 1.3"
November 24° 42° -16° (1964) 80° (1978) 1.26" 8.3"
December 11° 28° -29° (1989) 64° (1998) 0.63" 6.2"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 42° 66° 19° (1966) 96° (1959) 0.09" 0"
May 2 42° 67° 22° (1967) 93° (1959) 0.09" 0.1"
May 3 42° 67° 17° (1967) 92° (1949) 0.09" 0"
May 4 43° 67° 20° (1967) 92° (1949) 0.1" 0"
May 5 43° 68° 23° (1968) 92° (2004) 0.09" 0.1"
May 6 44° 68° 23° (1976) 87° (2004) 0.09" 0"
May 7 44° 68° 25° (1976) 88° (1963) 0.09" 0"
May 8 44° 69° 25° (1980) 85° (1963) 0.09" 0"
May 9 45° 69° 25° (1966) 94° (2004) 0.1" 0"
May 10 45° 69° 23° (1981) 90° (1987) 0.09" 0"
May 11 46° 69° 31° (1979) 86° (1958) 0.1" 0"
May 12 46° 70° 27° (1971) 89° (1988) 0.09" 0"
May 13 46° 70° 28° (1953) 91° (1987) 0.1" 0"
May 14 47° 70° 28° (1973) 92° (2001) 0.1" 0"
May 15 47° 70° 25° (1959) 93° (2001) 0.09" 0"
May 16 47° 71° 35° (1970) 90° (1987) 0.1" 0"
May 17 48° 71° 31° (1968) 91° (1996) 0.11" 0"
May 18 48° 71° 29° (1995) 92° (1970) 0.1" 0"
May 19 49° 71° 31° (2002) 89° (1975) 0.1" 0"
May 20 49° 72° 30° (1967) 92° (1948) 0.11" 0"
May 21 49° 72° 30° (1963) 92° (1964) 0.1" 0"
May 22 50° 72° 26° (1963) 90° (1964) 0.11" 0"
May 23 50° 72° 33° (1963) 94° (1950) 0.1" 0"
May 24 50° 73° 31° (1968) 89° (1950) 0.11" 0"
May 25 51° 73° 33° (1968) 99° (1967) 0.1" 0"
May 26 51° 73° 33° (1992) 97° (1967) 0.1" 0"
May 27 51° 73° 34° (1965) 91° (1969) 0.11" 0"
May 28 52° 74° 29° (1965) 96° (2006) 0.12" 0"
May 29 52° 74° 39° (1954) 91° (2006) 0.11" 0"
May 30 52° 74° 39° (1966) 91° (2002) 0.11" 0"
May 31 53° 74° 36° (1964) 86° (1961) 0.11" 0"
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