December is a good month at Indiana Dunes — it ranks 10th of the twelve here. Expect about 80% fewer visitors than July, the park's peak — 100,250 visits on average. Days run around 37°F by afternoon and 24°F at night, with 9.2 hours of daylight.
December against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| December (this page) | Good | 100,250 | −80% | 37°F | 24°F | 7.3" | 9.2 h |
| April (best) | Excellent | 166,419 | −67% | 57°F | 40°F | 0.6" | 13.3 h |
| July (peak crowds) | Good | 509,715 | peak | 82°F | 64°F | 0" | 14.9 h |
Weather figures are for the Porter area — the Indiana Dunes Nl station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is December a good time to visit Indiana Dunes?
It is a reasonable month — the park has stronger ones, but the records don't argue against it. December ranks 10 of 12 at Indiana Dunes on crowds, weather, daylight, and access together.
How crowded is Indiana Dunes in December?
About 100,250 recreation visits on average — 80% below July, the park's peak.
How warm is Indiana Dunes in December?
Average highs around 37°F and lows around 24°F at the Indiana Dunes Nl station, with about 7 inches of snow across the month.
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