How Crowded Is Waco Mammoth in December?
December is a quiet month at Waco Mammoth National Monument, running about 0.8× the park's average month — roughly 7% of the year's visitors come in December. That puts it between the March peak and the January low. Overall our best-time score rates December as "Fair" for a visit. Typical December weather averages a high near 60°F and a low around 39°F, with about 2.8" of precipitation. You'll get about 9.9 hours of daylight to explore.
Frequently Asked Questions
December is quiet at Waco Mammoth National Monument (about 0.8× the average month). Our best-time score rates it "Fair". The single best month overall is September.
The busiest month is March and the quietest is January. December sits at about 0.8× the park's average, or 7% of annual visitation.
Source: National Park Service Visitor Use Statistics (2015–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.