How Crowded Is Lewis and Clark in December?
December is a very quiet month at Lewis and Clark National Historical Park, running about 0.4× the park's average month — roughly 3% of the year's visitors come in December. It is the quietest month of the year here — the best time to have the place largely to yourself, though you may trade away some warmth and daylight. Typical December weather averages a high near 49°F and a low around 38°F, with about 10.7" of precipitation. You'll get about 8.4 hours of daylight to explore.
Frequently Asked Questions
December is very quiet at Lewis and Clark National Historical Park (about 0.4× the average month). Our best-time score rates it "Fair". The single best month overall is May.
The busiest month is July and the quietest is December. December sits at about 0.4× the park's average, or 3% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.