MLRA 30 - Sonoran Basin and Range Arizona, California, and Nevada 194,030 km2 (74,910 mi2)

Climate:
Average annual precipitation 50 to 250 mm in valleys but as much as 625 mm on mountain slopes. Precipitation is fairly evenly distributed throughout the year. Average annual temperature 16 to 24 C but as low as 10 C in the mountains. Average freeze-free period--Generally 240 days, but it is much shorter on the higher mountains and as long as 320 days in the south.

12/16/98