Overnight trading set a mixed tone for the CME Group early calls for Monday.

December 2010 corn futures traded 3 cents lower at $5.60 per bushel, while November soybeans were 1 1/4 cents lower at $11.83 3/4 per bushel, according to Dow Jones Newswires. December wheat was the lone grain in the black -- barely -- trading 1/4 cent higher at $7.04 3/4 per bushel.

Wheat's seen higher based on growing concerns about dry weather conditions in the Plains as farmers get busy planting the 2011 crop. Weaker-than-expected export sales figures last week continue to weigh on corn and soybean futures, analysts say.

• See the latest grain futures prices