Isle Royale National Park weather in December
December in Isle Royale National Park: freezing, a little rain, with clean air — a hit-or-miss time to visit.
#10 of 12 months in Isle Royale National Park · #525 of 604 destinations to visit in December · comfort 45/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Isle Royale National Park climate normals — December
| Daytime high | 0°C / 32°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -4°C / 24°F | |
| Feels like (high) | -7°C / 19°F | |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | -5°C / 23°F | |
| Sunshine | 3.3 h/day | |
| Daylight | 8.5 h | |
| Wind | 38 km/h / 24 mph | |
| Snowfall | 43 cm / 16.9 in | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Isle Royale National Park?
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Isle Royale National Park in December — FAQ
- Is December a good time to visit Isle Royale National Park?
- December in Isle Royale National Park: freezing, a little rain, with clean air — a hit-or-miss time to visit. It ranks #10 of 12 months for Isle Royale National Park on SeasonMap's comfort score (45/100).
- What is the weather like in Isle Royale National Park in December?
- In December, Isle Royale National Park averages a daily high of -0.2°C and a low of -4.5°C, with about 65.6 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Isle Royale National Park in December?
- Isle Royale National Park has a mean US Air Quality Index of about 33 in December.
- Does it snow in Isle Royale National Park in December?
- Isle Royale National Park sees roughly 43 cm of snowfall in December.