Weather on December 15 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
December 15th in Isle Royale National Park (via Houghton, MI) typically brings very cold winter weather, with average highs around 30°F and lows near 19°F. Over 50 years of records, the warmest December 15th was in 1998 (45°F average), while the coldest was 2010 (6°F) — a 39°F range across recorded history. Precipitation has occurred on 60% of recorded December 15th dates, with snow falling 36% of the time (heaviest snowfall: 11.8"). The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
Planning for December 15th in Isle Royale? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella. Check road conditions if traveling, as snow is possible.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 22°F | 14°F | 0.05" | -- |
| 2024 | 37°F | 30°F | 0" | -- |
| 2023 | 49°F | 36°F | 1.68" | -- |
| 2022 | 37°F | 33°F | 0.13" | -- |
| 2021 | 46°F | 38°F | 0.03" | -- |
| 2020 | 21°F | 13°F | 0" | -- |
| 2019 | 18°F | 11°F | 0.03" | -- |
| 2018 | 44°F | 23°F | 0" | -- |
| 2017 | 20°F | 9°F | 0.18" | -- |
| 2016 | 16°F | 6°F | 0" | -- |
| 2015 | 32°F | 28°F | 0" | -- |
| 2014 | 46°F | 32°F | 1.55" | -- |
| 2013 | 35°F | 7°F | 0" | -- |
| 2012 | 36°F | 26°F | 0.25" | -- |
| 2011 | 35°F | 20°F | 0.48" | -- |
| 2010 | 22°F | -9°F | 0" | -- |
| 2009 | 14°F | 8°F | 0" | -- |
| 2008 | 28°F | 0°F | 0.05" | -- |
| 2007 | 18°F | 3°F | 0" | -- |
| 2006 | 34°F | 29°F | 0.23" | -- |
| 2005 | 32°F | 26°F | 0.3" | -- |
| 2004 | 33°F | 11°F | 0" | -- |
| 2003 | 28°F | 24°F | 0" | -- |
| 2002 | 36°F | 18°F | 0" | 0" |
| 2001 | 36°F | 21°F | 0" | 0" |
| 2000 | 26°F | 3°F | 0.05" | 0.9" |
| 1999 | 36°F | 30°F | 1.02" | 4" |
| 1998 | 52°F | 38°F | 0" | 0" |
| 1997 | 50°F | 26°F | 0" | 0" |
| 1996 | 34°F | 24°F | 2.06" | 6.4" |
| 1995 | 30°F | 19°F | 0.23" | 3.5" |
| 1994 | 31°F | 25°F | 0.03" | 0.2" |
| 1993 | 40°F | 28°F | 0" | 0" |
| 1992 | 37°F | 33°F | 1.19" | 0.3" |
| 1991 | 11°F | 7°F | 0.58" | 3.5" |
| 1990 | 34°F | 27°F | 0" | 0" |
| 1989 | 11°F | 6°F | 0.38" | 3.3" |
| 1988 | 11°F | 4°F | 0.23" | 1.8" |
| 1987 | 32°F | 26°F | 0.13" | 0.5" |
| 1981 | 21°F | 17°F | 2.06" | 11.8" |
| 1980 | 20°F | 14°F | 0.25" | 1.3" |
| 1979 | 34°F | 9°F | 0.28" | 1.4" |
| 1978 | 32°F | 11°F | 0" | 0" |
| 1977 | 31°F | 26°F | 0" | 0" |
| 1976 | 30°F | 20°F | 0" | 0" |
| 1975 | 14°F | 7°F | 0.1" | 0.7" |
| 1974 | 32°F | 28°F | 0.81" | 5.8" |
| 1973 | 17°F | 10°F | 1.32" | 8.7" |
| 1972 | 21°F | 7°F | 0.08" | 0.8" |
| 1971 | 34°F | 27°F | 0.97" | 6.7" |