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).
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.
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.
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.
What makes Vesper different from other weather apps?
Vesper replaces template-driven forecasts with short editorial briefs written in an authorial voice, and publicly grades its own sunset predictions through Sunset Verify. Every other weather app on the market generates its text by filling variables into a template. Vesper writes each forecast as original prose with a point of view about the day.
Is Vesper free?
Vesper is free to download with core weather features. Premium features and pricing will be announced at launch.
What is Sunset Verify?
Sunset Verify is Vesper's signature feature that predicts sunset quality each day from live atmospheric data and lets users verify the prediction with a photo, building a personal accuracy track record over time.
When will Vesper be available?
Vesper is currently in beta. Join the waitlist at vespersky.ai/beta to get early access and be notified when the app launches on iOS and Android.
What does it mean for a weather app to be editorial?
An editorial weather app applies a point of view to the same atmospheric data every other app has. Instead of showing you a grid of numbers, it writes a short brief — two or three sentences with intent — about what the day is going to feel like and what you should probably do about it. The data is identical. The voice is the product.
How does Vesper write a brief if it is not a human writer?
Vesper's briefs are generated by a language model operating under an editorial style guide written by people and refined through thousands of examples. The style guide, cut discipline, and voice rules are the content. The model is the mechanism. Template weather apps are generated by models that were never given an editorial style guide, which is why they all sound identical.
Does Vesper have radar maps or severe weather alerts?
Vesper does not ship radar maps or a proprietary severe weather alert system. Severe weather alerts come through the operating system, which is the right place for them. Radar was rejected because a radar map is not a brief and would not make the forecast more worth reading. We respect both as product decisions. We are doing something different.
Which cities does Vesper cover?
Vesper publishes editorial weather coverage for over 100 US cities with full daily briefs and all 50 state hubs with region-specific editorial context. The mobile app gives you a brief wherever you are — anywhere Vesper has weather data coverage, which is essentially every populated area in the world.
Is my location data private on Vesper?
Yes. Vesper uses your approximate location only to deliver weather forecasts for your area. Location data is not stored on our servers, not sold, and not shared with third parties. Photos taken through Sunset Verify stay on your device and never leave your phone.
How often does the Vesper Brief update?
A fresh editorial brief is generated every morning based on that day’s forecast. Inside the app, live conditions update continuously based on your location. The editorial brief is a once-a-day artifact — written to be read in the morning, not refreshed hourly.
Can I use Vesper without an account?
Yes. Vesper does not require an account to read the daily brief, check sunset predictions, or use the editorial features. Personal data like Sunset Verify history is stored locally on your device, so there is no cloud account to create.
Get Vesper
your first wyoming brief, on us.
Join the waitlist and we’ll send your first Wyoming brief the morning the app goes live.