How Crowded Is Tumacácori in December?
December is a very busy month at Tumacácori National Historical Park, running about 2.2× the park's average month — roughly 18% of the year's visitors come in December. It is in fact the busiest month of the year here, so expect full parking lots, busy trails and booked-out campgrounds. If crowds bother you, August (the quietest month) or the recommended August are easier. Typical December weather averages a high near 63°F and a low around 32°F, with about 1" of precipitation. You'll get about 10.0 hours of daylight to explore.
Frequently Asked Questions
December is very busy at Tumacácori National Historical Park (about 2.2× the average month). Our best-time score rates it "Poor". The single best month overall is August.
The busiest month is December and the quietest is August. December sits at about 2.2× the park's average, or 18% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.