Sylvan Lake, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 15° 37° -43° (1963) 68° (1981) 0.33" 6.4"
February 17° 38° -34° (1962) 68° (1958) 0.7" 10.3"
March 22° 45° -30° (1956) 72° (1946) 1.03" 12"
April 29° 53° -15° (1966) 84° (1989) 2.04" 10.6"
May 39° 62° 5° (1954) 90° (1969) 3.58" 1.2"
June 47° 72° 19° (1951) 97° (1954) 2.83" 0"
July 54° 80° 30° (1971) 100° (1954) 2.75" 0"
August 53° 79° 22° (1966) 96° (1988) 2.33" 0"
September 43° 70° 8° (1961) 97° (1971) 1.67" 0.2"
October 32° 57° -5° (1991) 85° (1963) 1.47" 3.6"
November 23° 44° -25° (1952) 76° (1975) 0.58" 6.1"
December 15° 36° -37° (1964) 68° (1979) 0.37" 5.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 49° 76° 27° (1965) 97° (2005) 0.06" 0"
Sep 2 48° 76° 26° (1952) 95° (1969) 0.06" 0"
Sep 3 48° 75° 26° (1974) 97° (1971) 0.06" 0"
Sep 4 48° 75° 22° (1961) 92° (1978) 0.06" 0"
Sep 5 47° 75° 26° (1962) 94° (1978) 0.06" 0"
Sep 6 47° 74° 20° (1956) 94° (1978) 0.05" 0"
Sep 7 47° 74° 28° (1956) 90° (1978) 0.06" 0"
Sep 8 46° 74° 30° (1948) 88° (1978) 0.06" 0"
Sep 9 46° 73° 22° (1943) 92° (1959) 0.06" 0"
Sep 10 46° 73° 19° (1962) 90° (1979) 0.06" 0"
Sep 11 45° 72° 21° (1989) 88° (1998) 0.06" 0"
Sep 12 45° 72° 24° (1943) 88° (1990) 0.06" 0"
Sep 13 44° 72° 25° (1961) 88° (1959) 0.05" 0"
Sep 14 44° 71° 17° (1961) 87° (1955) 0.06" 0"
Sep 15 44° 71° 19° (1961) 86° (1959) 0.06" 0"
Sep 16 43° 70° 23° (1943) 90° (1948) 0.06" 0"
Sep 17 43° 70° 19° (1971) 88° (2000) 0.06" 0"
Sep 18 42° 69° 22° (1991) 89° (2000) 0.05" 0"
Sep 19 42° 69° 26° (1945) 85° (1972) 0.06" 0"
Sep 20 42° 68° 19° (1983) 86° (1979) 0.06" 0"
Sep 21 41° 68° 20° (1995) 89° (1956) 0.05" 0"
Sep 22 41° 67° 19° (1985) 82° (1953) 0.06" 0.1"
Sep 23 40° 67° 19° (1956) 85° (1958) 0.05" 0"
Sep 24 40° 67° 14° (1984) 85° (1992) 0.05" 0"
Sep 25 40° 66° 21° (1985) 85° (1967) 0.05" 0"
Sep 26 39° 66° 15° (1972) 85° (2001) 0.05" 0"
Sep 27 39° 65° 12° (1984) 85° (1963) 0.05" 0"
Sep 28 38° 65° 15° (1984) 84° (1952) 0.05" 0.1"
Sep 29 38° 64° 11° (1985) 84° (1957) 0.04" 0"
Sep 30 38° 64° 8° (1961) 85° (1978) 0.05" 0"
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