Wyoming, USA · The Equality State
weather across wyoming — the state where the high plains meet yellowstone.
Wyoming is the least populated US state and contains some of the most dramatic terrain in the country — the Yellowstone Plateau, the Grand Teton Range, the Wind River Range, and the open high plains of the eastern half. The geography puts the state in a high-elevation continental climate with the strongest sustained winds of any major US region, dramatic chinook events from the Rocky Mountain front, and the brutal winters that come with sitting at high latitude (41–45°N) and high altitude (mean elevation 6,700 feet).
What is the weather like in Wyoming?
Wyoming has the second-highest mean elevation of any US state at 6,700 feet (Colorado is higher at 6,800 ft). The climate is high-elevation continental with brutal winters, brief warm summers, the strongest sustained winds in the US, and dramatic chinook wind events from the Rocky Mountain front. Yellowstone and the western mountains receive some of the heaviest snowfall in the lower 48; the eastern high plains sit in classic Northern Plains continental conditions.
The seasons, honestly
seasons in wyoming.
Wyoming seasons follow the high-elevation continental pattern with sharp transitions and dramatic seasonal contrasts. Winter (November–April) is the longest and most defining season — the Yellowstone Plateau and the western mountains receive 150–500+ inches of annual snowfall, supporting Jackson Hole and the Wyoming ski industry. The eastern high plains experience polar vortex incursions with sub-zero stretches and the chinook wind events that warm the city dramatically.
Spring (April–May) is dramatic and unpredictable. Late-season blizzards are routine across the state, and the snowmelt produces the spring runoff that fills the North Platte and Snake rivers. Summer (June–September) is brief and warm in the basins, with average highs in the 80s°F at lower elevations and significantly cooler at higher elevations. The North American monsoon edges into southern Wyoming in late summer, producing afternoon thunderstorms over the Wind River Range and the southern Rockies.
Fall (September–October) is the second perfect window. Peak aspen foliage in the Wind River Range, the Snake River canyon, and the Tetons runs from mid to late September — some of the most photographed alpine fall color in the country. The Wyoming wind regime produces sustained gusts that affect daily life across the state.
Defining weather events
what the sky does in wyoming.
Wyoming weather is defined by two large-scale mechanisms. The persistent Wyoming wind regime gives the state the strongest sustained winds of any major US region. Average annual wind speeds exceed 13 mph at most locations, with frequent gusts above 50 mph year-round. The combination of the high elevation, the open Plains terrain, and the proximity to the Rocky Mountains produces winds that have shaped the state’s infrastructure and culture.
The Rocky Mountain front produces the second defining mechanism: chinook wind events that descend from the Wind River Range, the Bighorn Mountains, and the Tetons. Strong westerly winds descending the eastern slopes warm adiabatically and dry dramatically, producing temperature spikes of 30–40°F in a few hours during winter. Casper Mountain, the Bighorn Mountains, and the Wind River Range all produce significant chinook events for the eastern Wyoming cities.
The Yellowstone Plateau produces the third mechanism: dramatic high-elevation snowfall and the unique microclimate that supports the Yellowstone ecosystem. The plateau receives over 150 inches of annual snowfall and experiences some of the coldest sustained winter temperatures in the lower 48 outside of the Alaska interior.
Wyoming has the strongest sustained winds of any major US region, with average annual wind speeds exceeding 13 mph at most locations and frequent gusts above 50 mph. The combination of high elevation, open Plains terrain, and Rocky Mountain proximity produces continuous wind that has shaped the state’s infrastructure.
Strong westerly winds descending the eastern slopes of the Rocky Mountain front produce dramatic temperature warming. Eastern Wyoming cities can experience temperature spikes of 30–40°F in a few hours during winter chinook events.
Continental polar air masses descend from Canada and produce sustained sub-zero stretches across Wyoming. The state has recorded some of the coldest temperatures in the lower 48 outside of Alaska, with the all-time record at -66°F.
The Yellowstone Plateau receives over 150 inches of annual snowfall at higher elevations, supporting the unique alpine ecosystem and the dramatic winter wildlife scenes that draw photographers from around the world.
High-elevation thin atmosphere produces rapid radiational cooling at night. Wyoming routinely sees 35–45°F swings between daily highs and overnight lows in summer and even in winter when the chinook winds are absent.
Best cities, by season
where to be in wyoming.
Wyoming’s best season is summer — the brief warm window when the high country is accessible, Yellowstone is at peak, and the long high-latitude evenings produce the dramatic open-sky sunsets the state is built for.
What other weather apps get wrong
why wyoming needs a different forecast.
Generic weather apps treat Wyoming as one cold mountain state. They show "cold and windy" for Cheyenne and Jackson as if both are the same forecast when Cheyenne sits in the open high plains at 6,062 feet and Jackson sits in the Teton mountain valley at 6,237 feet — similar elevations but completely different climates because of the surrounding terrain.
They miss that Wyoming has the strongest sustained winds of any major US region, that the chinook wind events are dramatic enough to be a meteorological event in their own right, and that the Yellowstone Plateau experiences some of the coldest sustained winter temperatures in the lower 48. AccuWeather treats Yellowstone and the eastern Wyoming high plains as the same forecast despite very different mountain influence.
The Vesper Brief reads Wyoming as the high-elevation wind-driven state it actually is and writes the chinook wind regime as the meteorological event it actually is.
Unlike the Weather Channel, Vesper writes for the part of Wyoming you actually stand in.
Frequently asked
about wyoming weather.
Frequently Asked Questions
Why is Wyoming so windy?
Wyoming has the strongest sustained winds of any major US region thanks to the combination of high elevation, open Plains terrain, and proximity to the Rocky Mountains. Average annual wind speeds exceed 13 mph at most locations, with frequent gusts above 50 mph year-round. The pressure gradient between continental highs and migrating low pressure systems is amplified by the Rocky Mountain front, producing continuous wind that has shaped the state’s infrastructure and culture.
How cold do Wyoming winters get?
Wyoming has some of the coldest winters in the contiguous US. The all-time state record low is -66°F. The Yellowstone Plateau and the high mountain valleys experience sustained sub-zero overnight lows during polar vortex events. Casper averages 25 sub-zero overnight lows per year. Wind chills below -40°F are common during major events.
How much snow does Yellowstone get?
Yellowstone National Park receives some of the heaviest snowfall in the lower 48 outside of mountain regions. The plateau averages over 150 inches of annual snowfall, with the highest elevations seeing 300+ inches. Most park roads close from November through May because of the snow. The unique ecosystem depends on the deep snowpack.
How does the Wind River Range affect Wyoming weather?
The Wind River Range runs north-south through central Wyoming and produces dramatic orographic lift on Pacific air masses crossing the continent. The range creates a partial rain shadow on the eastern (lee) side, producing the chinook wind events that warm Casper and the eastern Wyoming cities dramatically during winter. The range also catches the North American monsoon moisture in late summer, producing afternoon thunderstorms over the high country.
Why is Wyoming’s population so low?
Wyoming is the least populated US state with about 580,000 residents — fewer than many single cities. The combination of harsh winters, sustained wind, high elevation, semi-arid conditions in much of the state, and the absence of major industries beyond ranching, energy, and tourism has historically limited population growth. The dramatic terrain and the open spaces are part of the state’s appeal but also part of why it remains so sparsely populated.
Get Vesper