How Crowded Is Tumacácori National Historical Park in December?

December runs about 2.2× Tumacácori National Historical Park's average month, which makes it a very busy month here — roughly 18% of the park's yearly visitors come in December.

In a typical December the park sees roughly 6,900 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

It is the single busiest month of the year at Tumacácori; August, the quietest, runs only about 0.4× the average — a 6-to-1 swing between high and low season.

On our Best Time to Visit score December rates 24/100 ("Poor"), versus the top-rated August at 78/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical December weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 63°F and an overnight low around 32°F, with about 1" of precipitation.

That average of about 47°F is cool, so layers and a shorter daylight window matter.

Because June, July and August together draw about 9% of annual visitors, choosing December instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 10 hours of daylight in December to explore — near the year-round minimum.

Park-wide, 2024 drew 35,256 recreation visits, down 6.9% from 37,872 in 2023.

Across the past decade overall visitation has eased about 20.6%, so December may feel a touch quieter than it once did.