Each lends itself to completely different experiences within the valley and nearby area. Even in the summer however, Jackson's weather can turn cold, rainy and generally nasty in the space of an afternoon. Never drink water from streams or other bodies of water. The bacteria Giardia is a common pollutant and can make you very sick. The elevation in Jackson contributes to both altitude sickness and sunburn.
Mosquitoes can be overwhelming during wet parts of the summer.
A section is included on birds to look for, best bet were to find the species, and identifying confusing birds. Birds of Grand Teton National Park by Bert Raynes Available through the Grand Teton Natural History Association, the text focuses specifically on the terrain and species within the park and surrounding area. Straightforward and direct, color pictures are included with each species, best places to spot and general comments. A group of amateur birders meets on the second Sunday of every month. Times and places are announced in a local newspaper.