Climate Insights for Gunnison

The climate in Gunnison is cool. The average annual temperature is 9°C and approximately 419mm of precipitation falls per year. March is the wettest month, receiving around 61mm of rainfall. Gunnison is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are December, January, February, when temperatures can drop to -9°C. Gunnison experiences heavy snowfall, typically from January through December.

Gunnison has a wide annual temperature range, spanning 42°C from the coldest to warmest months. The warmest month is July, when average highs reach 33°C and the mean temperature sits around 25°C. The coldest month is December, when overnight lows fall to -9°C and the daily average is -4°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.

Gunnison is a relatively dry area, receiving approximately 419mm of precipitation annually, which averages out to around 35mm per month. The wettest month is March, averaging 61mm of rainfall. January and April also tend to see above-average precipitation. The driest month is August, with just 7mm. That's 54mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Gunnison receives heavy snowfall, accumulating around 201cm annually from January through December. The snowiest month is January, with approximately 51cm. Winter travel should account for significant snow cover.

Gunnison is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 0km/h gap between the calmest and windiest months.

It is currently spring in Gunnison, which began on March 20, 2026. Gunnison is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 33°C, while the coldest stretch bottoms out in December near -9°C. Summer is next, beginning on June 21, 2026 — 7 days from now.

The best time to visit Gunnison is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 13mm per month. By contrast, December can be quite cold with temperatures dropping to -9°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Gunnison based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.