Weather on December 18 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
December 18th in Indiana Dunes National Park (via Gary, IN) typically brings cold winter weather, with average highs around 34°F and lows near 20°F. Over 55 years of records, the warmest December 18th was in 1977 (45°F average), while the coldest was 1985 (3°F) — a 42°F range across recorded history. Precipitation has occurred on 22% of recorded December 18th dates, with snow falling 13% of the time (heaviest snowfall: 4"). The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Indiana Dunes? Bundle up with warm layers and protect extremities from the cold.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 49°F | 38°F | 0.28" | 0" |
| 2024 | 41°F | 33°F | 0" | 0" |
| 2023 | 43°F | -- | 0" | 0" |
| 2022 | 23°F | 12°F | 0" | 0" |
| 2021 | 38°F | 31°F | -- | -- |
| 2020 | 30°F | 19°F | 0.08" | 0.2" |
| 2019 | 35°F | 18°F | 0" | 0" |
| 2018 | 43°F | 23°F | -- | -- |
| 2017 | 43°F | 32°F | -- | 0" |
| 2016 | 29°F | 16°F | -- | -- |
| 2015 | 34°F | 26°F | 0" | 0" |
| 2014 | 26°F | 23°F | 0" | 0" |
| 2013 | 32°F | 14°F | 0" | 0" |
| 2012 | 41°F | 32°F | 0" | 0" |
| 2011 | 33°F | 23°F | 0.08" | 0.6" |
| 2010 | 25°F | 8°F | 0" | 0" |
| 2009 | 36°F | 23°F | 0" | 0" |
| 2008 | 22°F | 8°F | 0" | 0" |
| 2007 | 26°F | 17°F | 0" | 0" |
| 2006 | 45°F | 35°F | 0" | 0" |
| 2005 | 26°F | 12°F | 0" | 0" |
| 2004 | 35°F | 25°F | 0" | 0" |
| 2003 | 26°F | 17°F | 0" | 0" |
| 2002 | 48°F | 28°F | 1.7" | 0" |
| 2001 | 46°F | 30°F | 0" | 0" |
| 2000 | 13°F | -2°F | 0" | 0" |
| 1999 | 29°F | 21°F | 0.05" | 1" |
| 1998 | 51°F | 35°F | 0" | 0" |
| 1997 | 46°F | 24°F | 0" | 0" |
| 1996 | 16°F | 4°F | 0.05" | -- |
| 1995 | 36°F | 28°F | -- | -- |
| 1994 | 43°F | 22°F | 0" | 0" |
| 1993 | 40°F | 27°F | 0.86" | 0" |
| 1992 | 32°F | 28°F | 0" | 0" |
| 1991 | 36°F | 19°F | 0" | 0" |
| 1990 | 40°F | 35°F | 0.36" | 0" |
| 1989 | 17°F | -1°F | 0" | 0" |
| 1988 | 35°F | 12°F | 0.64" | 0" |
| 1987 | 31°F | 17°F | 0" | 0" |
| 1986 | 42°F | 28°F | 0" | 0" |
| 1985 | 12°F | -7°F | 0" | 0" |
| 1984 | 39°F | 24°F | 0" | 0" |
| 1983 | 13°F | 2°F | 0.2" | 1.5" |
| 1982 | 44°F | 30°F | 0" | 0" |
| 1981 | 27°F | 13°F | 0.79" | 4" |
| 1980 | 37°F | 29°F | 0" | 0" |
| 1979 | -- | 11°F | 0" | 0" |
| 1978 | 43°F | 21°F | 0" | 0" |
| 1977 | 54°F | 36°F | 0" | 0" |
| 1976 | 47°F | 19°F | 0" | 0" |
| 1975 | 14°F | 4°F | 0" | 0" |
| 1974 | 31°F | 20°F | 0" | 0.3" |
| 1973 | 24°F | 18°F | 0.2" | 0.8" |
| 1972 | 38°F | 16°F | 0" | 0" |
| 1971 | 28°F | 11°F | 0" | 0" |