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
Sep 1 55° 78° 39° (1974) 96° (1970) 0.1" NA
Sep 2 55° 78° 40° (1972) 97° (1956) 0.1" NA
Sep 3 54° 77° 33° (1974) 94° (1978) 0.1" NA
Sep 4 54° 77° 37° (1956) 91° (1970) 0.1" NA
Sep 5 53° 77° 34° (1965) 96° (1978) 0.1" NA
Sep 6 53° 76° 36° (1956) 103° (1976) 0.09" NA
Sep 7 53° 76° 38° (1955) 98° (1978) 0.09" NA
Sep 8 52° 76° 36° (1995) 95° (1983) 0.09" NA
Sep 9 52° 75° 38° (1969) 93° (1978) 0.09" NA
Sep 10 51° 75° 36° (1955) 94° (1981) 0.09" NA
Sep 11 51° 75° 31° (1955) 92° (1948) 0.09" NA
Sep 12 51° 74° 33° (1975) 95° (1990) 0.09" NA
Sep 13 50° 74° 31° (1964) 91° (1990) 0.09" NA
Sep 14 50° 74° 32° (1949) 91° (1969) 0.09" NA
Sep 15 49° 74° 32° (1964) 97° (1955) 0.09" NA
Sep 16 49° 73° 35° (1971) 94° (1955) 0.09" NA
Sep 17 49° 73° 32° (1971) 94° (1955) 0.09" NA
Sep 18 48° 72° 30° (1971) 92° (1974) 0.08" NA
Sep 19 48° 72° 26° (1991) 97° (1984) 0.08" NA
Sep 20 48° 72° 28° (1962) 87° (1970) 0.08" NA
Sep 21 47° 71° 29° (1983) 85° (1984) 0.08" NA
Sep 22 47° 71° 24° (1974) 87° (1958) 0.08" NA
Sep 23 46° 71° 27° (1989) 83° (1958) 0.08" NA
Sep 24 46° 70° 28° (1951) 88° (1990) 0.08" NA
Sep 25 46° 70° 30° (1951) 89° (1956) 0.08" NA
Sep 26 45° 70° 25° (1965) 92° (1956) 0.08" NA
Sep 27 45° 69° 29° (1964) 95° (1956) 0.07" NA
Sep 28 44° 69° 22° (1951) 85° (1979) 0.07" NA
Sep 29 44° 69° 26° (1984) 89° (1970) 0.07" NA
Sep 30 44° 68° 23° (1974) 91° (1976) 0.07" NA
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