Climate and monthly weather forecast
Wyoming, USA

Flag of Wyoming, USA
Flag of Wyoming, USA

The climate of Wyoming

Wyoming has a semi-arid, continental type of climate (Köppen climate classification BSk) with warm and moderately wet summers and cold winters. Colorado in the south, Utah in the southwest, Idaho in the west, Montana in the north, and South Dakota and Nebraska in the east, border the state. Wyoming is windy and dry compared to the rest of the United States and has more substantial temperate variations over the seasons, mostly due to its topography - the state is a vast plateau divided by mountain ranges such as the Rocky Mountains, at the base of which lie the Great Plains.

The Continental Divide runs north-south in the land-locked Cowboy state, more specifically along its center - the rain waters that accumulate in the nearby areas sink in the soil in the Great Divide Basin. The Rocky Mountains range covers the western two-third parts, while the High Plains, prairie at high elevation, covers the remaining one-third part; the distribution of many high mountain ranges in the landscape has a significant influence on the climate of Wyoming.

Wyoming summers tend to be warm with the average high temperature from 75°F (23.9°C) to 90°F (32.2°C) in the peak of July in the plains whereas the highlands above 2500 meters experience 70°F (21.1°C) to 75°F (23.9°C). Nights, typical of semi-arid zones, cool down faster and the average temperatures are 50°F (10°C) to 60°F (15.6°C).
Winters are cold and extreme in a few periods and the highlands. Average low temperatures during January are in the cold 0°F (-17.8°C) to 18°F (-7.8°C) range across different areas and elevations in the state.

Late spring and early summer is the usual precipitation period - Wyoming is a dry state with an average precipitation of 10" (254mm); lowlands receive sparse rainfall in the range of 8" (203mm) to 10" (254mm), while the higher elevations average 15" (381mm) to 20" (508mm). Snowfall in the mountain ranges reaches up to 200" (5080mm), while the plains also accumulate significant amounts during the winter.

Wyoming experiences thunderstorms and tornadoes during late spring and early summer. Chinook winds provide a warming effect in some areas during the winter. Winds blow at high speeds across the vast plains until they encounter the high mountain ranges, which provide natural barriers and create temperature extremities along with a semi-arid climate.

Basin recorded the highest ever temperature of 114°F (45.6°C) on July 12, 1900, in Wyoming, while Riverside recorded the coldest temperature of -66°F (-54.4°C) on February 9, 1933.

The best time to visit Wyoming

The best time to visit Wyoming is from mid-summer to autumn, particularly from June to October.
Late spring and early summer witness rain and thunderstorms, while early spring lingers with the effects of the cold winter. Summers tend to be moderate in the highlands, but the lowlands see many days in the 85°F (29.4°C) to 95°range. The fall season sees pleasant temperatures, particularly in September and October, and a change of colors in the foliage of the high country.
Summer sees a significant rise in tourist numbers, especially in places like the Yellowstone and Grand Teton national parks, where most of the trails are open until October.

The worst time to visit Wyoming

Winter is the worst time to visit Wyoming as the state experiences cold weather with extreme temperatures.
Highlands and mountaintops experience intense cold with vast amounts of snowfall often up to 200" (5080mm). The lowlands accumulate less snow, but many of them register approximately 50" (1270mm) during the winter. Winter days are often below freezing point in many parts of Wyoming, and the night's witness even colder temperatures - the season is slow regarding tourist numbers. However, off-season discounts and winter activities attract some visitors.

Weather hazards

Wyoming is prone to wildfires, thunderstorms, and tornadoes in late spring and early summer. Hot and dry conditions usually exist at the peak during the summer, which increases the frequency and intensity of wildfires. The lodgepole and ponderosa forests are particularly susceptible to wildfires in dry conditions. Southeastern plains of Wyoming have more thunderstorm days than other parts of the state. The southeastern corner of the state shows increased precedence of tornadoes, which decreases going further westward - in general, the intensity of these storms is smaller compared to some of the other parts of the country.

Weather in January

January is usually the coldest month of the year in Wyoming, with the average low temperatures even below 0°F (-17.8°C) in the northwest regions - low temperatures go well below the average in many places. Central and southwest Wyoming is in the frigid 1°F (-17.2°C) to 32°F (0°C) average range with short days as the daily sunshine lasts for an average of 4 to 5 hours. Weather in January »

Weather in February

February is a chilly winter month in Wyoming with the state in the firm grip of the freezing weather. Nights are bitterly cold, while an average of 15 days sees a fair amount of sunshine. Up in the northwest, Cody at an average high temperature of 40°F (4.4°C) and Jackson with 33°F (0.6°C) barely manage to push the mercury above freezing during the day, while most of the central and eastern parts of Wyoming see daily highs of 35°F (1.7°C) to 40°F (4.4°C). Snowfall is 10" (254mm) to 15" (381mm) in many places, with a general decrease in the amount of snow towards the south and east. Weather in February »

Weather in March

March is a cold month even though it starts the spring season in Wyoming. Day high temperatures average 35°F (1.7°C) to 50°F (10°C) across different regions of the state. The Big Horn Basin, especially its lowest parts as well as the lower elevations of the northeast and eastern parts of the state, are warmer compared to the rest of the state. March seldom registers more than 1" (25mm) of rain in most areas, but snowfall touches fair numbers - northwest Wyoming averages 15" (381mm), while the southeast laps up 10" (254mm) to 15" (381mm), with the remaining areas in between 5" (127mm) to 10" (254mm). Weather in March »

Weather in April

April transitions the cold conditions to warm temperatures with the advent of spring in entire Wyoming. Day temperatures are usually in the warm 50°F (10°C) to 60°F (15.6°C), while nights are mild in the 35°F (1.7°C) to 45°F (7.2°C) across the state. April sees a bit of rain with an average of 1" (25mm) to 2" (51mm) in the state, which gradually progresses in numbers up to summer. Weather in April »

Weather in May

May is a beautiful warm month with many sunny days in Wyoming with the land blooming with flowers and the singing of the birds. Tourist numbers go northwards as comfortable day temperatures in the 55°F (12.8°C) to 70°F (21.1°C) and comfortable night temperatures above freezing in the 35°F (1.7°C) to 45°F (7.2°C) range, set in across the majority of the state. Rain returns in better numbers with 2" (51mm) to 3" (76mm) almost everywhere, while snow is negligible, barring in a few places like Yellowstone and the high mountains. Weather in May »

Weather in June

June brings pleasant summer temperatures in Wyoming that draw tourists from all over the country to its natural beauty and wildlife, among many other attractions. Average high temperatures are between 65°F (18.3°C) to 70°F (21.1°C) in the northwest, while the rest of the state records warmer temperatures of 70°F (21.1°C) to 85°F (29.4°C). Weather in June »

Weather in July

July is usually the hottest month of the year in Wyoming. The summer weather is temperate and delightful as the average high temperatures across the state are 75°F (23.9°C) to 90°F (32.2°C); a few places touch 95°F (35°C) but a mercury reading of 100°F (37.8°C) is rare. Weather in July »

Weather in August

August is a wonderful summer month with swelling tourist numbers in Wyoming. The average temperatures are in the 45°F (7.2°C) to 85°F (29.4°C) range with 24 sunny days across the state. The southeast mountain ranges, such as Laramie have moderate temperatures in the 47°F (8.3°C) to 78°F (25.6°C), while the northeast is a little higher in the range of 52°F (11.1°C) to 86°F (30°C). Weather in August »

Weather in September

September is a getaway to the beautiful autumn season of Wyoming with moderate temperatures and a brief splash of colors in the landscape that is usually brown prairie or white snowy. Early fall sees the average warm high temperatures of 60°F (15.6°C) to 80°F (26.7°C) range and the average low temperatures in the mild 32°F (0°C) to 47°F (8.3°C) range. Weather in September »

Weather in October

October lies in the middle to a late period of the autumn season in Wyoming. Average high temperatures tend to be comfortable in the day in the 55°F (12.8°C) to 65°F (18.3°C) but the nights are cold as the average low temperatures drop below 32°F (0°C) in most areas. October also witnesses the first snow of the season in many places that accumulate up to 5" (127mm). Weather in October »

Weather in November

November is a transitional month from the brief autumn in Wyoming that sees a drop in temperatures in the state. Average low temperatures are well below the freezing and range in between 15°F (-9.4°C) to 25°F (-3.9°C). The days are windy with a touch of rain and temperatures are usually from 45°F (7.2°C) to 55°F (12.8°C). Most of the places receive upwards of 10" (254mm) of snow as the ground changes color to white. Weather in November »

Weather in December

December lies in the cold winter with the average high temperatures in the 24°F (-4.4°C) to 41°F (5°C) range and the average low temperatures in the freezing 1°F (-17.2°C) to 17°F (-8.3°C) range across the state. The eastern portion of Wyoming is comparatively milder with high temperatures in the 35°F (1.7°C) to 41°F (5°C) and low temperatures above 10°F (-12.2°C), while the western and northern areas frequently see nights drop well below 10°F (-12.2°C). Rain is negligible in most parts of the state as only a few places like Old Faithful in Yellowstone National Park register a meaningful 3.2" (81mm). Snowfall is heavy in the northwest part of the state, such as Moose, which records 44" (1118mm), while the rest of the lowlands register 10" (254mm) to 15" (381mm). December usually wears a blanket of snow around the state as a few tourists brave the cold to enjoy activities like snowmobiling, snowshoeing, cross-country skiing, snow tubing, among others - take care to wear layers of warm clothing before engaging in outdoor activities. Weather in December »
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