Sea level. Mean sea level (MSL) (abbreviated simply sea level) is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.
Dates: September - October. Weather: Autumn in Wyoming is a delight. Many locations will see snow in mid-September, but it doesnât get to be real winter until late November. During October and November youâll discover a warm Indian Summer, with cool nights and beautiful changing colors. Early freezes in the fall are common.
From September through November, the average daily maximum is 54Â°F while the minimum average is a cool 23Â°F. The fall months average 23 days that drop below freezing. For a comfortable trip, bring plenty of layered clothing. For more information about weather in Grand Teton National Park, please visit our trip planning section on weather. To learn more about summer weather safety, watch our video podcast.