This map is
very illustrative of how dry Montana is. As you can see, much of
central and eastern Montana is very dry, receiving less than 15
inches of annual precipitation a year. As the precipitation map
shows, the heaviest precipitation in Montana is found either on
the higher mountain peaks or up in NW Montana.
huge amounts of precipitation found in the Glacier
National Park area,
which is highlighted in a light blue. In the higher peaks of
Glacier, it is not uncommon to have more than 60 inches of annual
a year (most of which falls in the form of snow). Conversely,
just a few miles away to the east in Glacier, it is also not
uncommon for the landscape to
be significantly dryer (the high mountains rob the surrounding
areas of moisture).