The average monthly total hours of sunshine over the year
The mean percent of hours of sunhours during the day over the year
7 km/h
overcast and snow
7 km/h
almost clear and no rain
22 km/h
partly cloudy and no rain
Boulder, Colorado is situated in the western part of the United States, nestled in the foothills of the Rocky Mountains. The city boasts a semi-arid climate that features four distinct seasons.
During winter, the temperatures in Boulder tend to drop quite low, averaging between -1°C and 10°C. So you can expect cold temperatures and occasional snowfall during this time of year. The air is often dry and snowfall is common, which attracts winter sports enthusiasts to the city's ski resorts like Eldora Mountain Resort. Winter is a great time to partake in outdoor activities like snowshoeing in Chautauqua Park or to watch a movie at the Boulder International Film Festival in February.
As spring sets in, Boulder experiences mild and enjoyable weather, with average temperatures ranging from 5°C to 20°C. This season offers a great opportunity to explore the city's many parks and hiking trails, such as the Flatirons Vista Trail or the Boulder Creek Path. Just be aware because there are occasional rain showers during this season. Late spring and early summer also bring the Colorado Shakespeare Festival, which offers world-class performances of the Bard's plays in an outdoor theater.
Summer in Boulder brings warm and sunny weather, with temperatures averaging between 15°C and 30°C. There is an occasional afternoon thunderstorms during this time of year.The city comes alive with outdoor music festivals and cultural events, including the RockyGrass bluegrass festival, the Colorado Music Festival, and the summer season of the Colorado Shakespeare Festival.
Autumn in Boulder is marked by dry and mild weather, with temperatures ranging from 4°C to 20°C on average. This is a nice season and perfect for scenic drives in the fall foliage or for visits to the Boulder Farmers' Market for fresh, local produce. Boulder is also home to two major athletic events in the fall: the Bolder Boulder 10K race on Memorial Day and the Ironman Boulder triathlon in late summer.
During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.
Other facts from our historical weather data:
