Weather on December 20 at Mount Rainier
Mount Rainier National Park
Based on 55 years of data from Seattle, WA
Elevation Note: Mount Rainier sits at 5,400 ft. Expect temperatures 19°F cooler than the data shown below, which comes from Seattle, WA at a lower elevation.
Planning Your Visit
December 20th in Mount Rainier National Park (via Seattle, WA) typically brings chilly winter weather, with average highs around 46°F and lows near 37°F. Over 55 years of records, the warmest December 20th was in 1972 (53°F average), while the coldest was 1990 (16°F) — a 37°F range across recorded history. Precipitation has occurred on 67% of recorded December 20th dates, with snow falling 2% of the time. The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Mount Rainier? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 46°F | 42°F | 0.69" | -- |
| 2024 | 55°F | 41°F | 0" | -- |
| 2023 | 54°F | 36°F | 0" | -- |
| 2022 | 39°F | 30°F | 0.86" | -- |
| 2021 | 39°F | 36°F | 0.15" | -- |
| 2020 | 55°F | 47°F | 0" | -- |
| 2019 | 55°F | 47°F | 3.99" | -- |
| 2018 | 58°F | 42°F | 0.61" | -- |
| 2017 | 45°F | 29°F | 0.18" | -- |
| 2016 | 51°F | 37°F | 0.03" | -- |
| 2015 | 49°F | 43°F | 0.48" | -- |
| 2014 | 59°F | 46°F | 1.68" | -- |
| 2013 | 45°F | 33°F | 0.25" | -- |
| 2012 | 45°F | 35°F | 1.35" | 0" |
| 2011 | 45°F | 38°F | 0" | -- |
| 2010 | 45°F | 36°F | 0.18" | -- |
| 2009 | 58°F | 46°F | 0.36" | -- |
| 2008 | 27°F | 16°F | 0.33" | -- |
| 2007 | 45°F | 31°F | 0.2" | -- |
| 2006 | 47°F | 36°F | 1.22" | -- |
| 2005 | 52°F | 45°F | 0.84" | -- |
| 2004 | 47°F | 31°F | 0" | -- |
| 2003 | 50°F | 45°F | 0.23" | -- |
| 2002 | 52°F | 43°F | 0" | -- |
| 2001 | 42°F | 39°F | 0.23" | -- |
| 2000 | 43°F | 32°F | 0.08" | -- |
| 1999 | 48°F | 43°F | 0" | -- |
| 1998 | 27°F | 19°F | 0" | 0" |
| 1997 | 46°F | 37°F | 0.51" | 0" |
| 1996 | 46°F | 40°F | 0.38" | 0" |
| 1995 | 54°F | 38°F | 0.05" | 0" |
| 1994 | 53°F | 46°F | 2.69" | 0" |
| 1993 | 44°F | 30°F | 0" | 0" |
| 1992 | 46°F | 40°F | 0.23" | 0" |
| 1991 | 46°F | 35°F | 0.33" | 0" |
| 1990 | 21°F | 11°F | 0" | 0" |
| 1989 | 49°F | 45°F | 0.23" | 0" |
| 1988 | 43°F | 40°F | 1.04" | 0" |
| 1987 | 43°F | 32°F | 0.94" | 0" |
| 1986 | 48°F | 34°F | 0" | 0" |
| 1985 | 38°F | 33°F | 0" | 0" |
| 1984 | 37°F | 30°F | 0.1" | 0.5" |
| 1983 | 29°F | 21°F | 0" | 0" |
| 1982 | 45°F | 39°F | 2.16" | 0" |
| 1981 | 46°F | 37°F | 0" | 0" |
| 1980 | 52°F | 43°F | 1.52" | 0" |
| 1979 | 50°F | 44°F | 0.58" | 0" |
| 1978 | 43°F | 35°F | 0.15" | 0" |
| 1977 | 50°F | 29°F | 0" | 0" |
| 1976 | 49°F | 33°F | 0" | 0" |
| 1975 | 44°F | 33°F | 0" | 0" |
| 1974 | 57°F | 39°F | 2.11" | 0" |
| 1973 | 56°F | 44°F | 1.27" | 0" |
| 1972 | 55°F | 52°F | 0.23" | 0" |
| 1971 | 42°F | 36°F | 0" | 0" |