Indiana Dunes National Park weather in December
December in Indiana Dunes National Park: cold, a little rain, with clean air — a good time to visit.
#10 of 12 months in Indiana Dunes National Park · #362 of 604 destinations to visit in December · comfort 66/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Indiana Dunes National Park climate normals — December
| Daytime high | 5°C / 41°F | 🧥 cold |
|---|---|---|
| Nighttime low | 1°C / 33°F | |
| Feels like (high) | 1°C / 34°F | |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | -1°C / 29°F | |
| Sunshine | 4.8 h/day | |
| Daylight | 9.2 h | |
| Wind | 22 km/h / 14 mph | |
| Snowfall | 5.7 cm / 2.2 in | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Indiana Dunes National Park in December — FAQ
- Is December a good time to visit Indiana Dunes National Park?
- December in Indiana Dunes National Park: cold, a little rain, with clean air — a good time to visit. It ranks #10 of 12 months for Indiana Dunes National Park on SeasonMap's comfort score (66/100).
- What is the weather like in Indiana Dunes National Park in December?
- In December, Indiana Dunes National Park averages a daily high of 4.9°C and a low of 0.7°C, with about 65.7 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Indiana Dunes National Park in December?
- Indiana Dunes National Park has a mean US Air Quality Index of about 33 in December.
- Does it snow in Indiana Dunes National Park in December?
- Indiana Dunes National Park sees roughly 5.7 cm of snowfall in December.