Iona, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 28° -28° (1988) 68° (1989) 0.49" NA
February 13° 34° -34° (1994) 75° (1995) 0.57" NA
March 22° 45° -19° (1998) 84° (1988) 1.45" NA
April 33° 59° 8° (1997) 93° (1990) 2.4" NA
May 45° 71° 24° (2005) 100° (2004) 3.62" NA
June 54° 81° 32° (1998) 111° (1988) 3.4" NA
July 60° 89° 46° (1997) 113° (2003) 2.92" NA
August 58° 88° 39° (1986) 112° (1988) 2.28" NA
September 48° 78° 24° (1991) 104° (2001) 1.98" NA
October 35° 63° 8° (1991) 98° (1997) 1.76" NA
November 22° 44° -13° (1985) 86° (1999) 0.88" NA
December 11° 32° -30° (1989) 73° (1998) 0.6" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jun 1 50° 76° 40° (1983) 93° (1984) 0.12" NA
Jun 2 51° 77° 41° (1983) 87° (1981) 0.12" NA
Jun 3 51° 77° 32° (1998) 93° (2006) 0.12" NA
Jun 4 51° 77° 32° (1998) 96° (2006) 0.12" NA
Jun 5 52° 78° 39° (2000) 93° (2006) 0.12" NA
Jun 6 52° 78° 41° (2000) 95° (1987) 0.12" NA
Jun 7 52° 78° 41° (1998) 100° (1987) 0.12" NA
Jun 8 53° 79° 42° (2007) 95° (1985) 0.12" NA
Jun 9 53° 79° 39° (1989) 105° (2000) 0.12" NA
Jun 10 53° 79° 39° (1989) 98° (2000) 0.12" NA
Jun 11 53° 80° 45° (1995) 93° (2007) 0.12" NA
Jun 12 54° 80° 46° (1985) 93° (1988) 0.11" NA
Jun 13 54° 80° 45° (1985) 94° (1987) 0.11" NA
Jun 14 54° 81° 47° (2002) 96° (2006) 0.11" NA
Jun 15 54° 81° 44° (1989) 98° (2006) 0.11" NA
Jun 16 55° 81° 44° (1989) 93° (2006) 0.11" NA
Jun 17 55° 81° 46° (2000) 95° (1987) 0.11" NA
Jun 18 55° 82° 48° (2000) 95° (1986) 0.11" NA
Jun 19 55° 82° 42° (2004) 100° (1988) 0.11" NA
Jun 20 56° 82° 46° (1985) 101° (1989) 0.11" NA
Jun 21 56° 83° 46° (1992) 100° (1988) 0.11" NA
Jun 22 56° 83° 46° (1992) 107° (1988) 0.11" NA
Jun 23 56° 83° 50° (1989) 99° (2002) 0.11" NA
Jun 24 57° 84° 49° (1993) 107° (1981) 0.11" NA
Jun 25 57° 84° 43° (2004) 111° (1988) 0.11" NA
Jun 26 57° 84° 45° (2003) 95° (1990) 0.11" NA
Jun 27 57° 85° 47° (1992) 98° (1990) 0.11" NA
Jun 28 57° 85° 45° (1985) 101° (1981) 0.11" NA
Jun 29 58° 85° 46° (1985) 103° (2002) 0.11" NA
Jun 30 58° 86° 45° (1995) 105° (2002) 0.1" NA
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