Weather on December 20 at Gateway Arch
Gateway Arch National Park
Based on 52 years of data from St. Louis, MO
Planning Your Visit
December 20th in Gateway Arch National Park (via St. Louis, MO) typically brings chilly winter weather, with average highs around 44°F and lows near 24°F. Over 52 years of records, the warmest December 20th was in 1978 (52°F average), while the coldest was 1989 (7°F) — a 45°F range across recorded history. Precipitation has occurred on 21% of recorded December 20th dates, with snow falling 4% of the time (heaviest snowfall: 3"). The last decade has been 10.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.2°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Gateway Arch? Bring layers as temperatures can vary throughout the day.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 58°F | 30°F | 0" | 0" |
| 2024 | 42°F | 30°F | 0" | -- |
| 2023 | 57°F | 31°F | 0" | 0" |
| 2022 | 45°F | 26°F | 0" | 0" |
| 2021 | 47°F | 23°F | 0" | 0" |
| 2020 | 50°F | 24°F | 0" | 0" |
| 2019 | 44°F | 19°F | 0" | 0" |
| 2018 | 48°F | 38°F | 0.25" | 0" |
| 2017 | 53°F | 37°F | 0" | 0" |
| 2016 | 44°F | 11°F | 0" | 0" |
| 2015 | 52°F | 34°F | 0" | 0" |
| 2014 | 37°F | 33°F | 0" | 0" |
| 2013 | 60°F | 35°F | 0" | 0" |
| 2012 | 55°F | 37°F | 1.07" | 0" |
| 2011 | 54°F | 44°F | 1.8" | -- |
| 2010 | 40°F | 26°F | 0" | 0" |
| 2009 | 35°F | 25°F | 0" | 0" |
| 2008 | -- | 29°F | 0" | 0" |
| 2007 | 46°F | 22°F | 0.08" | 0" |
| 2006 | 42°F | 30°F | 0.28" | 0" |
| 2005 | 31°F | 12°F | 0" | 0" |
| 2004 | 20°F | 14°F | 0" | 0" |
| 2003 | 37°F | 19°F | 0" | 0" |
| 2002 | 46°F | 34°F | 0.03" | 0" |
| 2001 | 43°F | 25°F | 0" | 0" |
| 2000 | 19°F | -1°F | 0" | 0" |
| 1999 | 46°F | 25°F | 0" | 0" |
| 1998 | 38°F | 33°F | 0" | 0" |
| 1997 | 61°F | 34°F | 0" | 0" |
| 1996 | 15°F | 8°F | 0" | 0" |
| 1995 | 30°F | 16°F | 0" | 0" |
| 1994 | 47°F | 38°F | 0.51" | 0" |
| 1993 | 46°F | 30°F | 0" | 0" |
| 1992 | 42°F | 25°F | 0.25" | 0" |
| 1990 | 57°F | 23°F | 0" | 0" |
| 1989 | 21°F | -8°F | 0" | 0" |
| 1988 | 70°F | 25°F | 0" | 0" |
| 1987 | 47°F | 19°F | 0.99" | 0" |
| 1986 | 53°F | 24°F | 0" | 0" |
| 1985 | 21°F | 2°F | 0.53" | 1.7" |
| 1982 | 55°F | 28°F | 0" | 0" |
| 1981 | 27°F | 1°F | 0" | -- |
| 1980 | 17°F | 7°F | 0" | 0" |
| 1979 | 58°F | 21°F | 0" | 0" |
| 1978 | 62°F | 41°F | 0" | 0" |
| 1977 | 53°F | 26°F | 0" | 0" |
| 1976 | 58°F | 20°F | 0" | 0" |
| 1975 | 51°F | 32°F | 0" | 0" |
| 1974 | 45°F | 30°F | 0" | 0" |
| 1973 | 32°F | 11°F | -- | 3" |
| 1972 | 43°F | 35°F | 0" | 0" |
| 1971 | 45°F | 38°F | 0.51" | 0" |