Weather on December 21 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
December 21st in Indiana Dunes National Park (via Gary, IN) typically brings cold winter weather, with average highs around 35°F and lows near 21°F. Over 55 years of records, the warmest December 21st was in 1990 (44°F average), while the coldest was 1989 (-4°F) — a 48°F range across recorded history. Precipitation has occurred on 38% of recorded December 21st dates, with snow falling 20% of the time (heaviest snowfall: 6"). The last decade has been 10.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.0°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Indiana Dunes? 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 | 49°F | 29°F | 0" | 0" |
| 2024 | 38°F | 27°F | 0.05" | 0.2" |
| 2023 | 45°F | -- | 0" | 0" |
| 2022 | 34°F | 20°F | 0" | 0" |
| 2021 | 43°F | 21°F | 0" | 0" |
| 2020 | 48°F | 31°F | -- | -- |
| 2019 | 50°F | 33°F | -- | -- |
| 2018 | 40°F | 32°F | -- | -- |
| 2017 | 36°F | 26°F | 0" | 0" |
| 2016 | 29°F | 17°F | 0" | 0" |
| 2015 | 51°F | 36°F | 1.37" | 0" |
| 2014 | 33°F | 29°F | 0" | 0" |
| 2013 | 36°F | 32°F | -- | -- |
| 2012 | 50°F | 30°F | 1.14" | 0" |
| 2011 | 41°F | 33°F | 0.08" | 0" |
| 2010 | 28°F | 7°F | 0.28" | 2" |
| 2009 | 35°F | 26°F | 0.13" | 0.6" |
| 2008 | 24°F | -5°F | 0.05" | 0.5" |
| 2007 | 37°F | 28°F | 0.03" | 0" |
| 2006 | 40°F | 26°F | 1.19" | 0" |
| 2005 | 24°F | 11°F | 0" | 0" |
| 2004 | 29°F | 10°F | 0" | 0" |
| 2003 | 30°F | 18°F | 0" | 0" |
| 2002 | 36°F | 31°F | 0.03" | 0.5" |
| 2001 | 41°F | 23°F | 0" | 0" |
| 2000 | 19°F | -1°F | 0.28" | 1.5" |
| 1999 | 24°F | 5°F | 0" | 0" |
| 1998 | 32°F | 3°F | 0.61" | 2.5" |
| 1997 | 35°F | 30°F | 0.05" | 0" |
| 1996 | 38°F | 31°F | -- | -- |
| 1995 | 28°F | 13°F | 0" | -- |
| 1994 | 52°F | 25°F | 0" | 0" |
| 1993 | 35°F | 25°F | 0.1" | 0" |
| 1992 | 33°F | 10°F | 0" | 0" |
| 1991 | 37°F | 26°F | 0" | 0" |
| 1990 | 47°F | 42°F | 2.29" | 0" |
| 1989 | 7°F | -14°F | 0" | 0" |
| 1988 | 37°F | 31°F | 0" | 0" |
| 1987 | 43°F | 28°F | 0" | 0" |
| 1986 | 40°F | 26°F | 0" | 0" |
| 1985 | 19°F | 0°F | 0" | 0" |
| 1984 | 53°F | 25°F | 1.42" | 0" |
| 1983 | 29°F | 11°F | 0.99" | 6" |
| 1982 | 35°F | 19°F | 0" | 0" |
| 1981 | 33°F | 11°F | 0.76" | 2" |
| 1980 | 26°F | 18°F | 0" | 0" |
| 1979 | -- | 24°F | 0" | 0" |
| 1978 | 39°F | 11°F | 0" | 0" |
| 1977 | -- | 19°F | 0.38" | 1.5" |
| 1976 | 19°F | 7°F | 0" | 0" |
| 1975 | 34°F | 19°F | 0" | 0" |
| 1974 | 35°F | 28°F | 0.3" | 2.5" |
| 1973 | 26°F | 9°F | 0.3" | 0" |
| 1972 | 36°F | 32°F | 0" | 0" |
| 1971 | 38°F | 28°F | 0" | 0" |