Isle Royale National Park in December
In December, Isle Royale National Park averages a high of 26°F and a low of 9°F, with 1.7 inches of precipitation (rain plus melted snow) and 11.9 inches of snowfall. About 0 people visit, the quietest month. Days are 8 hours 23 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 26° / 9°F
- Precipitation
- 1.7in
- Snow
- 11.9in
- Daylight
- 8h 23m
- Visitors
- 0
- Crowds
- Few or no visits
Best months for weather and crowds instead: May (quiet), June (busy) and September (moderate).
Few or no visitors in December: fewer than 3% of the busiest month's visits. Roads, ferries or the whole park may be closed; check Isle Royale National Park on nps.gov before you plan.
Weather 1991–2020 averages at Grand Portage, MN, 41.1 miles from the park's center, 730 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in December
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Voyageurs National Park | 21° / 2° | Few or no visits | Cold |
| Sleeping Bear Dunes National Lakeshore | 34° / 24° | Few or no visits | Cold |
| Indiana Dunes National Park | 37° / 24° | Quiet | Cold |
| Cuyahoga Valley National Park | 39° / 24° | Moderate | Cold |
| Gateway Arch National Park | 44° / 29° | Quiet | Cool |
Closures, reservations and alerts: Isle Royale National Park on nps.gov
All twelve months at Isle Royale · National parks to visit in December