The weather in the Rocky Mountains can sometimes be an adventure in itself, make sure to always check local weather before packing for your trip. Temperatures in this region can be unpredictable and change in an instant, but you can expect an average between 20 to 22 degrees Celsius from early June to September.
Months: April, May, early June
You can expect moderate temperatures in lower elevations with averages around 10 degrees C. Ski areas tend to remain open through March.
Months: Late June, July, August
Days can be sunny and hot, with temperatures reaching 27 to 32 degrees C.
Nights tend to be much cooler with temperatures dipping down to -1 to 4 degrees C. Higher elevations, and in places like Yellowstone National Park and Glacier National Park, be prepared for a sudden snow or rain shower even in mid-summer. The higher the elevation, the cooler it gets.
Months: September, October, early November
The autumn comes with crisp daytime temperatures and frosty nights. Several ski resorts open in November, however weather can be unpredictable. The days may be pleasant, maybe even warm, however, the evenings cool off quite a bit. It is possible to get snow and/or rain. It’s recommended to wear layers and bring a heavy coat, hat, gloves and warm shoes and boots. Sunscreen, sunglasses, and lip balm are also useful items to have on hand during the daytime.
Months: Late November, December, January, March
Although the weather can be tough to endure at times, the stunning scenery and quietness that comes with the winter season makes this region one of the favorite seasons for the locals. Temperatures can average below freezing at about -3 C.