"We saw further acceleration to the downside today and the principal driver is the weather," said Sterling Smith, a commodities analyst at Citigroup.
The prices for wheat and soybeans also fell.
Wheat for September dropped 22.8 cents, or 3.9 percent, to $5.57 a bushel. Soybeans for the same month fell 8 cents, or 0.7 percent, to $11.26 a bushel.
Most metals ended lower. Gold, silver, copper and platinum all fell, while palladium rose.
Gold for August delivery dropped $3.60, or 0.3 percent, to $1,317 an ounce. Silver for September fell 12.3 cents, or 0.6 percent, to $21.01 an ounce. Copper for the same month fell 1.9 cents, or 0.6 percent, to $3.26 an ounce. Platinum for October slipped $12.10, or 0.8 percent, to $1,495.60 an ounce. Palladium for September rose $7.05, or 0.8 percent, to $868.95 an ounce.
In energy trading, the price of oil dropped for the seventh straight day amid expectations that Libya will soon boost its exports of crude.
U.S. crude for August delivery fell 53 cents to close at $103.53 a barrel in New York.
Wholesale gasoline fell 3.1 cents to close at $2.989 a gallon. Natural gas fell 18.1 cents to close at $4.225 per 1,000 cubic feet. Heating oil fell 1.4 cents to close at $2.915 a gallon.