MLRA 55B - Central Black Glaciated Plains North Dakota and South Dakota 52,480 km2 (20,260 mi2)

Climate:
Average annual precipitation 400 to 500 mm. More than half of the precipitation falls during the growing season. Precipitation in winter is snow. Average annual temperature 4 to 7 C. Average freeze-free period--l20 to 140 days.

12/16/98