Wyoming climate guide

Temperature in Wyoming (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
3°C maximum daytime temperature in January in Wyoming (Cheyenne)3
5°C maximum daytime temperature in February in Wyoming (Cheyenne)5
7°C maximum daytime temperature in March in Wyoming (Cheyenne)7
13°C maximum daytime temperature in April in Wyoming (Cheyenne)13
19°C maximum daytime temperature in May in Wyoming (Cheyenne)19
24°C maximum daytime temperature in June in Wyoming (Cheyenne)24
28°C maximum daytime temperature in July in Wyoming (Cheyenne)28
27°C maximum daytime temperature in August in Wyoming (Cheyenne)27
22°C maximum daytime temperature in September in Wyoming (Cheyenne)22
16°C maximum daytime temperature in October in Wyoming (Cheyenne)16
8°C maximum daytime temperature in November in Wyoming (Cheyenne)8
4°C maximum daytime temperature in December in Wyoming (Cheyenne)4
Min temperature (night-time)
-10°C minimum night-time temperature in January in Wyoming (Cheyenne)-10
-8°C minimum night-time temperature in February in Wyoming (Cheyenne)-8
-6°C minimum night-time temperature in March in Wyoming (Cheyenne)-6
-1°C minimum night-time temperature in April in Wyoming (Cheyenne)-1
4°C minimum night-time temperature in May in Wyoming (Cheyenne)4
9°C minimum night-time temperature in June in Wyoming (Cheyenne)9
12°C minimum night-time temperature in July in Wyoming (Cheyenne)12
11°C minimum night-time temperature in August in Wyoming (Cheyenne)11
6°C minimum night-time temperature in September in Wyoming (Cheyenne)6
1°C minimum night-time temperature in October in Wyoming (Cheyenne)1
-5°C minimum night-time temperature in November in Wyoming (Cheyenne)-5
-9°C minimum night-time temperature in December in Wyoming (Cheyenne)-9

Sunshine & Daylight in Wyoming

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
10 hours of daylight per day in January in Wyoming (Cheyenne)10
11 hours of daylight per day in February in Wyoming (Cheyenne)11
12 hours of daylight per day in March in Wyoming (Cheyenne)12
13 hours of daylight per day in April in Wyoming (Cheyenne)13
15 hours of daylight per day in May in Wyoming (Cheyenne)15
15 hours of daylight per day in June in Wyoming (Cheyenne)15
15 hours of daylight per day in July in Wyoming (Cheyenne)15
14 hours of daylight per day in August in Wyoming (Cheyenne)14
12 hours of daylight per day in September in Wyoming (Cheyenne)12
11 hours of daylight per day in October in Wyoming (Cheyenne)11
10 hours of daylight per day in November in Wyoming (Cheyenne)10
9 hours of daylight per day in December in Wyoming (Cheyenne)9

Rainfall in Wyoming

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
5 days with some rainfall in January in Wyoming (Cheyenne)5
6 days with some rainfall in February in Wyoming (Cheyenne)6
9 days with some rainfall in March in Wyoming (Cheyenne)9
9 days with some rainfall in April in Wyoming (Cheyenne)9
11 days with some rainfall in May in Wyoming (Cheyenne)11
10 days with some rainfall in June in Wyoming (Cheyenne)10
11 days with some rainfall in July in Wyoming (Cheyenne)11
10 days with some rainfall in August in Wyoming (Cheyenne)10
7 days with some rainfall in September in Wyoming (Cheyenne)7
6 days with some rainfall in October in Wyoming (Cheyenne)6
6 days with some rainfall in November in Wyoming (Cheyenne)6
6 days with some rainfall in December in Wyoming (Cheyenne)6
Average monthly rainfall (mm)
11 mm monthly rainfall in January in Wyoming (Cheyenne)11
11 mm monthly rainfall in February in Wyoming (Cheyenne)11
28 mm monthly rainfall in March in Wyoming (Cheyenne)28
37 mm monthly rainfall in April in Wyoming (Cheyenne)37
67 mm monthly rainfall in May in Wyoming (Cheyenne)67
57 mm monthly rainfall in June in Wyoming (Cheyenne)57
54 mm monthly rainfall in July in Wyoming (Cheyenne)54
40 mm monthly rainfall in August in Wyoming (Cheyenne)40
34 mm monthly rainfall in September in Wyoming (Cheyenne)34
20 mm monthly rainfall in October in Wyoming (Cheyenne)20
16 mm monthly rainfall in November in Wyoming (Cheyenne)16
10 mm monthly rainfall in December in Wyoming (Cheyenne)10

More climate for Wyoming

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 2 (Low) in January in Wyoming (Cheyenne)2
UV (maximum) index 3 (Moderate) in February in Wyoming (Cheyenne)3
UV (maximum) index 5 (Moderate) in March in Wyoming (Cheyenne)5
UV (maximum) index 7 (High) in April in Wyoming (Cheyenne)7
UV (maximum) index 9 (Very High) in May in Wyoming (Cheyenne)9
UV (maximum) index 10 (Very High) in June in Wyoming (Cheyenne)10
UV (maximum) index 10 (Very High) in July in Wyoming (Cheyenne)10
UV (maximum) index 9 (Very High) in August in Wyoming (Cheyenne)9
UV (maximum) index 7 (High) in September in Wyoming (Cheyenne)7
UV (maximum) index 4 (Moderate) in October in Wyoming (Cheyenne)4
UV (maximum) index 2 (Low) in November in Wyoming (Cheyenne)2
UV (maximum) index 1 (Low) in December in Wyoming (Cheyenne)1
Heat & Humidity
No heat & humidity in January in Wyoming (Cheyenne)0
No heat & humidity in February in Wyoming (Cheyenne)0
No heat & humidity in March in Wyoming (Cheyenne)0
No heat & humidity in April in Wyoming (Cheyenne)0
No heat & humidity in May in Wyoming (Cheyenne)0
No heat & humidity in June in Wyoming (Cheyenne)0
Low heat & humidity in July in Wyoming (Cheyenne)L
Low heat & humidity in August in Wyoming (Cheyenne)L
No heat & humidity in September in Wyoming (Cheyenne)0
No heat & humidity in October in Wyoming (Cheyenne)0
No heat & humidity in November in Wyoming (Cheyenne)0
No heat & humidity in December in Wyoming (Cheyenne)0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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The climate guide for Wyoming, represented by Cheyenne, shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

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Wyoming climate overview

It was in Wyoming that Butch Cassidy and the Sundance Kid made their names as possibly the most notorious outlaws in American history. Lying between Montana and Colorado, where the Great Plains meet the Rocky Mountains, Wyoming is the least populated of all the US states. Its outstanding features are majestic mountains and high plains.

The climate of Wyoming is dominated by its elevation, on average over 2,000 metres (6,500ft) above sea level, and by its distance from the ocean. While rainfall throughout the state is generally low, it is greater in the west than the east because of the mountains.

Dominated by short grass and sagebrush the eastern third of Wyoming is almost treeless and too arid for growing crops, while the more mountainous west has sufficient moisture to support forests of pine. Overall most areas of the state have a general appearance of dryness much of the time, and the main agricultural activity is cattle farming.

Daytime summer temperatures are generally comfortable to warm and, apart from the occasional thunderstorm, are usually dry. Winters on the other hand are long and cold with a layer of snow covering most areas from December to February. In winter, snow accumulates to considerable depths in the high mountains of the Tetons, Wind River and Big Horn.

Wyoming has high levels of sunshine in all months of the year, and summer mornings are generally particularly clear. Wyoming is also quite windy, and during the winter months average wind speeds can reach 50 to 65 kilometres per hour (30 to 40 miles per hour).

In the far north west corner of Wyoming lies Yellowstone National Park, home to two thirds of all the geysers in the world and large areas of prime forest, though much of it was seriously damaged by fires in 1988. Within the park is some of the most impressive scenery to be found anywhere in the United States with lakes, canyons, rivers and spectacular waterfalls.

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