How Crowded Is Effigy Mounds in December?
December is a very quiet month at Effigy Mounds National Monument, 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 33°F and a low around 17°F, with about 1.6" of precipitation and roughly 8.8" of snow. You'll get about 8.8 hours of daylight to explore.
Frequently Asked Questions
December is very quiet at Effigy Mounds National Monument (about 0.4× the average month). Our best-time score rates it "Poor". 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.