Climate & Weather in Boulder
Boulder has a semi-arid, four-season foothills climate with real winters -- 70-90 inches of average annual snowfall (one 2026 aggregator cited 89 inches specifically) -- and genuinely mild, low-humidity summers relative to more humid parts of the country, with roughly 300 sunny days per year at an elevation of about 5,430 feet, a real and distinctive combination this project's Gulf Coast and Sun Belt markets do not share.
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Learn moreA Real Four-Season, High-Altitude Climate
Boulder sits at roughly 5,430 feet of elevation with a semi-arid (Koppen BSk) climate, per the base Boulder record and aggregated climate sourcing. July, the warmest month, averages a high around 85°F; December, the coldest, averages a high near 43°F, with overall temperatures ranging from about 19°F to 86°F across the year. Annual precipitation runs around 20 inches, and the city sees an average of roughly 300 sunny days per year -- a genuinely different climate character than the humid, four-season profile of inland Southeastern markets covered elsewhere in this project.
Real, Substantial Winter Snowfall
Boulder's average annual snowfall is cited at 70-90 inches, with one 2026 source specifying 89 inches -- consistent with the COLD_WINTERS and HIGH_SNOWFALL tags already assigned in the base Boulder record. This is real, meaningful winter weather, not an occasional dusting, and should factor into any relocation decision from a warm-climate market.
Hail Season Is a Real, Distinct Spring/Summer Hazard
As detailed on the homeowners-insurance topic page, Boulder sits in Colorado's Front Range hail corridor -- 101 hail reports within 10 miles of the city center since 2004, with the largest reported hailstone at 3.00 inches. This is a genuinely frequent seasonal hazard, distinct from the flash-flood and wildfire risks covered on the flood-hurricane-risk topic page, and worth planning around (vehicle and roof protection, for instance) during the spring-through-summer severe-weather season.
Low Humidity Year-Round
Boulder's semi-arid climate means genuinely low humidity relative to much of the country -- a real, disclosed contrast with the humid subtropical and Gulf Coast climates covered elsewhere in this project, consistent with the LOW_HUMIDITY tag in the base Boulder record. This affects everything from how heat and cold both feel to landscaping and water-use considerations for new residents.
Key takeaways
- Boulder sits at roughly 5,430 feet elevation with a semi-arid, four-season foothills climate -- July highs average around 85°F, December highs around 43°F, with about 300 sunny days per year.
- Average annual snowfall runs 70-90 inches (89 inches per one 2026 source) -- real, substantial winter weather, not an occasional dusting.
- Hail is a genuine, frequent spring/summer hazard specific to Boulder's Front Range location -- 101 reports within 10 miles of the city center since 2004, with hailstones up to 3.00 inches.
- Boulder's low year-round humidity is a real, distinctive contrast with the humid subtropical and Gulf Coast climates covered elsewhere in this project.
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