Cheyenne (WY) Temperature by Month
The average annual maximum temperature in Cheyenne, Wyoming, United States of America is 15°C (59°F), with daytime highs ranging from 3°C (37°F) in December to 29°C (84°F) in July. This page covers monthly averages, day-night differences, and how Cheyenne compares to cities worldwide.
Cheyenne Monthly Temperatures
In Cheyenne, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 13°C (55°F) in July to -9°C (16°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Cheyenne by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 320 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Cheyenne Temperatures: 1976-2026
Browse day-by-day temperature records for Cheyenne spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Cheyenne vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Cheyenne vs World: Temperature Compared
Cheyenne's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Cheyenne?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Cheyenne, December is the coolest month, with average highs of 3°C (37°F) and humidity around 54% — considered moderate. In July, the warmest month, temperatures average 29°C (84°F) with 52% humidity — conditions that feel moderate. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Cheyenne's weather — including monthly rainfall, sunshine hours, and humidity — visit our Cheyenne climate page.
