Sinai, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 24° -34° (1972) 66° (1981) 0.5" 6"
February 11° 31° -34° (1994) 68° (2000) 0.69" 6.9"
March 22° 43° -23° (1948) 85° (1968) 1.59" 8.6"
April 35° 59° 0° (1975) 95° (1980) 2.31" 2.2"
May 47° 71° 17° (1967) 99° (1967) 3.22" 0"
June 57° 80° 34° (1969) 104° (1988) 3.95" 0"
July 61° 84° 37° (1971) 107° (1976) 3.21" 0"
August 59° 82° 35° (1964) 105° (1973) 3.11" 0"
September 49° 73° 22° (1951) 103° (1976) 2.58" 0"
October 37° 60° 9° (1976) 92° (1980) 1.76" 1"
November 22° 41° -16° (1964) 80° (1978) 1.32" 5.3"
December 28° -29° (1989) 64° (1998) 0.52" 6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 41° 66° 19° (1966) 96° (1959) 0.09" NA
May 2 42° 66° 22° (1967) 93° (1959) 0.09" NA
May 3 42° 67° 17° (1967) 92° (1949) 0.09" NA
May 4 42° 67° 20° (1967) 92° (1949) 0.09" NA
May 5 43° 67° 23° (1968) 92° (2004) 0.09" NA
May 6 43° 68° 23° (1976) 87° (2004) 0.09" NA
May 7 44° 68° 25° (1976) 88° (1963) 0.09" NA
May 8 44° 68° 25° (1980) 85° (1963) 0.09" NA
May 9 45° 69° 25° (1966) 94° (2004) 0.1" NA
May 10 45° 69° 23° (1981) 90° (1987) 0.1" NA
May 11 46° 69° 31° (1979) 86° (1958) 0.1" NA
May 12 46° 70° 27° (1971) 89° (1988) 0.1" NA
May 13 46° 70° 28° (1953) 91° (1987) 0.1" NA
May 14 47° 71° 28° (1973) 92° (2001) 0.1" NA
May 15 47° 71° 25° (1959) 93° (2001) 0.1" NA
May 16 47° 71° 35° (1970) 90° (1987) 0.1" NA
May 17 48° 72° 31° (1968) 91° (1996) 0.1" NA
May 18 48° 72° 29° (1995) 92° (1970) 0.11" NA
May 19 48° 72° 31° (2002) 89° (1975) 0.11" NA
May 20 49° 73° 30° (1967) 92° (1948) 0.11" NA
May 21 49° 73° 30° (1963) 92° (1964) 0.11" NA
May 22 50° 73° 26° (1963) 90° (1964) 0.11" NA
May 23 50° 73° 33° (1963) 94° (1950) 0.11" NA
May 24 50° 74° 31° (1968) 89° (1950) 0.11" NA
May 25 51° 74° 33° (1968) 99° (1967) 0.11" NA
May 26 51° 74° 33° (1992) 97° (1967) 0.12" NA
May 27 51° 75° 34° (1965) 91° (1969) 0.12" NA
May 28 52° 75° 29° (1965) 96° (2006) 0.12" NA
May 29 52° 75° 39° (1954) 91° (2006) 0.12" NA
May 30 52° 76° 39° (1966) 91° (2002) 0.12" NA
May 31 53° 76° 36° (1964) 86° (1961) 0.12" NA
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