How Crowded Is Petroglyph in December?
December is an average month at Petroglyph National Monument, running about 0.9× the park's average month — roughly 8% of the year's visitors come in December. That puts it between the October peak and the August low. Overall our best-time score rates December as "Poor" for a visit. Typical December weather averages a high near 49°F and a low around 24°F, with about 0.6" of precipitation. You'll get about 9.6 hours of daylight to explore.
Frequently Asked Questions
December is average at Petroglyph National Monument (about 0.9× the average month). Our best-time score rates it "Poor". The single best month overall is August.
The busiest month is October and the quietest is August. December sits at about 0.9× the park's average, or 8% of annual visitation.
Source: National Park Service Visitor Use Statistics (1992–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.