Effigy Mounds National Monument in December
December at Effigy Mounds National Monument averages a daytime high near 33°F and an overnight low around 17°F, with about 1.6" of precipitation and roughly 9" of snow. Visitation runs about 0.4× the park's average month, which makes December a very quiet month here.
- Average low
- 17°F
- Average high
- 33°F
Range across the year: 10°F to 83°F
- Precipitation
- 1.6 in
- Snowfall
- 9 in
- Daylight
- 8.8 hours
Roughly 3% of the park's yearly visitors come in December: roughly 1,700 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
It is the quietest month of the year at Effigy Mounds; by contrast July, the busiest, runs about 2× the average — so December is the easiest time to have the place largely to yourself.
On our Best Time to Visit score December rates 42/100 ("Poor"). Our recommended month is May: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 25°F is cold, with winter conditions likely on higher ground. These figures are 1991–2020 NOAA climate normals from the nearest station, about 3.7 miles from the park.
Because June, July and August together draw about 42% 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 8.8 hours of daylight in December to explore — near the year-round minimum.
Park-wide, 2025 drew 56,912 recreation visits, down 8.2% from 61,975 in 2024.
Across the past decade overall visitation has risen about 7.1%, so a December visit is likely to feel busier than it did a few years ago.
How December compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| November | 46°F / 28°F | 0.4× Very quiet | 46 Fair |
| December | 33°F / 17°F | 0.4× Very quiet | 42 Poor |
| January | 27°F / 10°F | 0.5× Very quiet | 40 Poor |
All twelve months at Effigy Mounds, with the best time to visit.
Frequently Asked Questions
December averages a daytime high near 33°F and an overnight low around 17°F at Effigy Mounds National Monument, with about 1.6 inches of precipitation and roughly 9 inches of snow. These are 1991–2020 NOAA climate normals from the nearest station, about 3.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
December is very quiet at Effigy Mounds National Monument (about 0.4× the average month). Our best-time score rates it "Poor" at 42/100. Our recommended month 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.
A typical December sees about 2,000 recreation visits at Effigy Mounds National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Effigy Mounds in December
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See the full ranking of the best national parks to visit in December.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.