Weather on December 20 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
December 20th in Isle Royale National Park (via Houghton, MI) typically brings very cold winter weather, with average highs around 27°F and lows near 15°F. Over 50 years of records, the warmest December 20th was in 1977 (33°F average), while the coldest was 1989 (-5°F) — a 38°F range across recorded history. Precipitation has occurred on 56% of recorded December 20th dates, with snow falling 46% of the time (heaviest snowfall: 10"). The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for December 20th 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 | 28°F | 13°F | 0.38" | -- |
| 2024 | 24°F | 11°F | 0" | -- |
| 2023 | 33°F | 25°F | 0" | -- |
| 2022 | 20°F | 9°F | 0.18" | -- |
| 2021 | 32°F | 16°F | 0" | -- |
| 2020 | 33°F | 25°F | 0" | -- |
| 2019 | 33°F | 21°F | 0" | -- |
| 2018 | 37°F | 24°F | 0" | -- |
| 2017 | 20°F | 15°F | 0" | -- |
| 2016 | 36°F | 20°F | 0.1" | -- |
| 2015 | 30°F | 19°F | 0" | -- |
| 2014 | 28°F | 12°F | 0" | -- |
| 2013 | 26°F | 9°F | 0" | -- |
| 2012 | 33°F | 23°F | 0.23" | -- |
| 2011 | 32°F | 22°F | 0" | -- |
| 2010 | 24°F | 0°F | 0" | -- |
| 2009 | 21°F | 14°F | 0" | -- |
| 2008 | 18°F | -10°F | 0.03" | -- |
| 2007 | 34°F | 22°F | 0" | -- |
| 2006 | 38°F | 28°F | 0" | -- |
| 2005 | 24°F | 16°F | 0" | -- |
| 2004 | 14°F | -1°F | 0.03" | -- |
| 2003 | 30°F | 7°F | 0" | -- |
| 2002 | 34°F | 29°F | 0" | 1.4" |
| 2001 | 27°F | 24°F | 0.69" | 2.8" |
| 2000 | 18°F | 7°F | 0.03" | 0.2" |
| 1999 | 31°F | 9°F | 0.89" | 5" |
| 1998 | 21°F | 8°F | 0.43" | 3.3" |
| 1997 | 30°F | 25°F | 0.03" | 0.1" |
| 1996 | 20°F | 11°F | 0.13" | 2.5" |
| 1995 | 25°F | 15°F | 0.36" | 3.1" |
| 1994 | 42°F | 18°F | 0" | 0" |
| 1993 | 35°F | 25°F | 0.36" | 1" |
| 1992 | 13°F | 5°F | 0.18" | 1.5" |
| 1991 | 33°F | 19°F | 0.08" | 0.1" |
| 1990 | 36°F | 22°F | 0.25" | 0.4" |
| 1989 | -2°F | -8°F | 0.64" | 5.5" |
| 1988 | 32°F | 11°F | 1.04" | 6.3" |
| 1987 | 32°F | 27°F | 0.43" | 1.7" |
| 1981 | 24°F | -2°F | 0.53" | 3" |
| 1980 | 11°F | 4°F | 0.15" | 1.3" |
| 1979 | 34°F | 19°F | 0" | 0" |
| 1978 | 29°F | 20°F | 1.6" | 10" |
| 1977 | 35°F | 31°F | 0.38" | 0.9" |
| 1976 | 16°F | 6°F | 0.79" | 5.4" |
| 1975 | 25°F | 13°F | 0.36" | 2.8" |
| 1974 | 29°F | 23°F | 0.1" | 1.4" |
| 1973 | 16°F | 6°F | 0.23" | 4.9" |
| 1972 | 25°F | 16°F | 0" | 0" |
| 1971 | 25°F | 16°F | 0" | 0" |