MLRA 55C - Southern Black Glaciated Plains South Dakota 20,240 km2 (7,810 mi2)

Climate:
Average annual precipitation--50 to 525 mm. More than half of the precipitation falls during the growing season. Precipitation in winter is snow. Average annual temperature 7 to 9 C. Average freeze-free period--l30 to 155 days.

12/16/98