CHICAGO (Dow Jones)--Chicago Board of Trade corn futures ended lower Tuesday on outside market pressure and a bearish crop outlook, although the December contract rebounded just enough to settle right at the summer's previous low close.

September corn, which is in delivery, ended down 14 cents at $3.12 1/4 a bushel and December corn ended down 10 1/2 cents at $3.19 1/2.

The weakness was "pretty straightforward," said Chad Henderson, an analyst at Prime Ag Consultants. "Everyone who bought last week was betting on a frost," he said. "We didn't get it."

Traders and analysts also noted bearish outside markets that weighed on corn and other commodities. Equities and crude oil fell, and the dollar gained.

Weather is the key fundamental feature of the market, and remains bearish.

"I've already started hearing chatter that the harvest is just around the corner and that September weather is going to allow the underdeveloped crop to really put on a bumper-size potential yield," said Mike Zuzolo, president of Global Commodity Analytics and Consulting.

Midday weather forecast updates were for warmer and drier for the Midwest over the next two weeks, which would be good for the crop, World Weather Inc. said.

Funds sold an estimated 8,000 contracts Tuesday. Zuzolo said that continued pressure from outside markets could stymie a soybean-led, pre-harvest rally.

The market isn't getting much of a boost from demand, analysts add. Feed demand has been suffering for months, ethanol demand is seen as questionable.

"We just don't have a lot of new export business right now, and we're adding supply," Henderson added.

Farmers have been tight holders of grain recently, but analysts noted that basis, or the difference between cash and futures prices, weakened Tuesday.

CBOT oats ended lower. September oats ended down 7 1/2 cents at $2.03 1/4 and December oats settled down 9 1/2 cents at $2.15 1/2.

Ethanol futures were lower. September ethanol ended down $0.006 at $1.605 a gallon and December ethanol ended down $0.017 at $1.557.

-By Ian Berry, Dow Jones Newswires; 312-341-5778;