Weather on March 15 at Isle Royale
Isle Royale National Park
Based on 51 years of data from Houghton, MI
Planning Your Visit
March 15th in Isle Royale National Park (via Houghton, MI) typically brings cold spring weather, with average highs around 36°F and lows near 18°F. Over 51 years of records, the warmest March 15th was in 1990 (52°F average), while the coldest was 2014 (4°F) — a 48°F range across recorded history. Precipitation has occurred on 37% of recorded March 15th dates, with snow falling 25% of the time (heaviest snowfall: 12.2"). The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for March 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 |
|---|---|---|---|---|
| 2026 | 29°F | 20°F | 0.03" | -- |
| 2025 | 50°F | 31°F | 1.02" | -- |
| 2024 | 50°F | 22°F | 0" | -- |
| 2023 | 46°F | 17°F | 0" | -- |
| 2022 | 50°F | 9°F | 0" | -- |
| 2021 | 34°F | 14°F | 0" | -- |
| 2020 | 29°F | 8°F | 0" | -- |
| 2019 | 34°F | 22°F | 0.18" | -- |
| 2018 | 26°F | 12°F | 0" | -- |
| 2017 | 27°F | 11°F | 0" | -- |
| 2016 | 40°F | 34°F | 0.05" | -- |
| 2015 | 56°F | 23°F | 0" | -- |
| 2014 | 18°F | -10°F | 0" | -- |
| 2013 | 33°F | 11°F | 0" | -- |
| 2012 | 52°F | 32°F | 0" | -- |
| 2011 | 50°F | 28°F | 0" | -- |
| 2010 | 59°F | 33°F | 0" | -- |
| 2009 | 48°F | 25°F | 0" | -- |
| 2008 | 23°F | 6°F | 0" | -- |
| 2007 | 19°F | 10°F | 0" | -- |
| 2006 | 26°F | 11°F | 0" | -- |
| 2005 | 28°F | 8°F | 0" | -- |
| 2004 | 29°F | 14°F | 0" | -- |
| 2003 | 45°F | 26°F | 0" | -- |
| 2002 | 26°F | 22°F | 1.52" | 12.2" |
| 2001 | 42°F | 25°F | 0" | 0" |
| 2000 | 33°F | 23°F | 0.81" | 4.8" |
| 1999 | 49°F | 20°F | 0" | 0" |
| 1998 | 26°F | 9°F | 0" | 0" |
| 1997 | 15°F | 6°F | 0.28" | 1" |
| 1996 | 33°F | 19°F | 0.25" | 1" |
| 1995 | 53°F | 36°F | 0" | 0" |
| 1994 | 47°F | 17°F | 0.05" | 0.2" |
| 1993 | 27°F | 1°F | 0" | 0" |
| 1992 | 23°F | 9°F | 0" | 0" |
| 1991 | 41°F | 17°F | 0" | 0" |
| 1990 | 64°F | 39°F | 0.05" | 0" |
| 1989 | 20°F | 1°F | 0.05" | 0.4" |
| 1988 | 28°F | 19°F | 0.05" | 1" |
| 1982 | 37°F | 25°F | 0" | 0" |
| 1981 | 39°F | 16°F | 0.05" | 0.2" |
| 1980 | 27°F | 10°F | 0" | 0" |
| 1979 | 22°F | -3°F | 0" | 0" |
| 1978 | 33°F | 16°F | 0.3" | 1.2" |
| 1977 | 38°F | 33°F | 0.33" | 0" |
| 1976 | 30°F | 7°F | 0.18" | 0.7" |
| 1975 | 45°F | 19°F | 0" | 0" |
| 1974 | 39°F | 28°F | 0" | 0" |
| 1973 | 36°F | 29°F | 0.03" | 0.1" |
| 1972 | 42°F | 15°F | 0.25" | 1" |
| 1971 | 34°F | 19°F | 1.55" | 4.5" |