Weather on December 15 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 15th in Mount Rainier National Park (via Seattle, WA) typically brings chilly winter weather, with average highs around 47°F and lows near 38°F. Over 55 years of records, the warmest December 15th was in 1980 (55°F average), while the coldest was 2008 (27°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 60% of December 15th dates historically, with the wettest December 15th recording 3.35" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for December 15th 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 | 59°F | 49°F | 1.88" | -- |
| 2024 | 49°F | 40°F | 0" | -- |
| 2023 | 54°F | 38°F | 0" | -- |
| 2022 | 42°F | 29°F | 0" | -- |
| 2021 | 44°F | 36°F | 0" | -- |
| 2020 | 49°F | 41°F | 0.2" | -- |
| 2019 | 43°F | 35°F | 0.3" | -- |
| 2018 | 51°F | 41°F | 0.23" | -- |
| 2017 | 45°F | 36°F | 0.05" | -- |
| 2016 | 39°F | 34°F | 0" | -- |
| 2015 | 47°F | 33°F | 0.05" | -- |
| 2014 | 57°F | 41°F | 0" | -- |
| 2013 | 53°F | 48°F | 0.08" | -- |
| 2012 | 42°F | 30°F | 0.61" | -- |
| 2011 | 44°F | 38°F | 0.08" | -- |
| 2010 | 49°F | 41°F | 0.25" | -- |
| 2009 | 49°F | 38°F | 0.76" | -- |
| 2008 | 31°F | 23°F | 0" | -- |
| 2007 | 46°F | 41°F | 0.63" | -- |
| 2006 | 49°F | 36°F | 0.15" | -- |
| 2005 | 41°F | 24°F | 0" | -- |
| 2004 | 53°F | 42°F | 0" | -- |
| 2003 | 47°F | 39°F | 0.03" | -- |
| 2002 | 55°F | 44°F | 1.07" | -- |
| 2001 | 49°F | 39°F | 1.6" | -- |
| 2000 | 43°F | 34°F | 0" | -- |
| 1999 | 53°F | 49°F | 2.57" | -- |
| 1998 | 51°F | 40°F | 0" | -- |
| 1997 | 49°F | 42°F | 1.3" | 0" |
| 1996 | 46°F | 36°F | 0.05" | 0" |
| 1995 | 51°F | 41°F | 0.03" | 0" |
| 1994 | 46°F | 39°F | 1.04" | 0" |
| 1993 | 47°F | 43°F | 0" | 0" |
| 1992 | 43°F | 32°F | 0" | 0" |
| 1991 | 40°F | 29°F | 0" | 0" |
| 1990 | 46°F | 35°F | 0.53" | 0" |
| 1989 | 43°F | 38°F | 0" | 0" |
| 1988 | 44°F | 30°F | 0" | 0" |
| 1987 | 39°F | 32°F | 0" | 0" |
| 1986 | 54°F | 41°F | 0" | 0" |
| 1985 | 48°F | 34°F | 0" | 0" |
| 1984 | 43°F | 37°F | 0.36" | 0" |
| 1983 | 43°F | 37°F | 0" | 0" |
| 1982 | 55°F | 45°F | 2.01" | 0" |
| 1981 | 45°F | 42°F | 2.72" | 0" |
| 1980 | 65°F | 45°F | 0" | 0" |
| 1979 | 40°F | 34°F | 0.99" | 0" |
| 1978 | 45°F | 34°F | 0" | 0" |
| 1977 | 48°F | 43°F | 2.46" | 0" |
| 1976 | 60°F | 48°F | 0.18" | 0" |
| 1975 | 45°F | 35°F | 0.28" | 0" |
| 1974 | 54°F | 41°F | 0.36" | 0" |
| 1973 | 53°F | 44°F | 3.35" | 0" |
| 1972 | 42°F | 30°F | 0.69" | 0" |
| 1971 | 43°F | 37°F | 0.1" | 0" |