115 - Central Mississippi Valley Wooded Slopes Indiana, Illinois, and Missouri 60,860 km2 (23,500 mi2)

Climate:
Average annual precipitation 900 to 1,150 mm. About two-thirds of the precipitation falls during the freeze-free period. The maximum is in spring and early in summer and the minimum from midsummer through autumn. Average annual temperature 12 to 14 C. Average freeze-free period—180 to 200 days, increasing from north to south.

12/16/98