University of Guam, College of Agriculture and Lifesciences Cooperative Extension Services
Guam is the largest and southern-most island in
the Marianas chain. It lies about.13° North latitude
and has a wet and dry season of approximately equal
lengths. The island is about 30 miles long and ranges
from four in the middle to eight miles in width and is
oriented in a northeast, southwest direction. The pre-
vailing winds are easterly and bring an average annual
rainfall of about 85 inches. A range of hills extends
from the waist toward the south on the western side.
The highest of these hills, 1300 feet, is Mt. Lamlam