Weather on December 18 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 18th in Mount Rainier National Park (via Seattle, WA) typically brings chilly winter weather, with average highs around 47°F and lows near 37°F. Over 55 years of records, the warmest December 18th was in 1979 (52°F average), while the coldest was 1984 (30°F) — a 22°F range across recorded history. Precipitation has occurred on 64% of recorded December 18th dates, with snow falling 2% of the time (heaviest snowfall: 7"). The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for December 18th 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 | 52°F | 42°F | 0.33" | -- |
| 2024 | 57°F | 45°F | 0.66" | -- |
| 2023 | 48°F | 38°F | 0.03" | -- |
| 2022 | 44°F | 31°F | 0.03" | -- |
| 2021 | 52°F | 37°F | 1.07" | -- |
| 2020 | 52°F | 44°F | 0.13" | -- |
| 2019 | 48°F | 37°F | 0.13" | -- |
| 2018 | 53°F | 46°F | 1.5" | -- |
| 2017 | 51°F | 42°F | 1.75" | -- |
| 2016 | 39°F | 27°F | 0" | -- |
| 2015 | 51°F | 42°F | 1.37" | -- |
| 2014 | 51°F | 46°F | 1.52" | -- |
| 2013 | 46°F | 39°F | 0.1" | -- |
| 2012 | 41°F | 33°F | 0.13" | -- |
| 2011 | 48°F | 38°F | 0.38" | -- |
| 2010 | 50°F | 34°F | 0.33" | -- |
| 2009 | 56°F | 43°F | 0.08" | -- |
| 2008 | 36°F | 26°F | 0.89" | -- |
| 2007 | 48°F | 39°F | 1.22" | -- |
| 2006 | 41°F | 27°F | 0" | -- |
| 2005 | 48°F | 27°F | 0" | -- |
| 2004 | 53°F | 42°F | 0.03" | -- |
| 2003 | 57°F | 33°F | 0" | -- |
| 2002 | 47°F | 38°F | 0.08" | -- |
| 2001 | 46°F | 36°F | 0.41" | -- |
| 2000 | 45°F | 30°F | 0" | -- |
| 1999 | 50°F | 44°F | 0" | -- |
| 1998 | 43°F | 30°F | 0" | -- |
| 1997 | 48°F | 34°F | 0" | 0" |
| 1996 | 46°F | 31°F | 0" | 0" |
| 1995 | 47°F | 43°F | 0.53" | 0" |
| 1994 | 52°F | 46°F | 0.41" | 0" |
| 1993 | 43°F | 32°F | 0" | 0" |
| 1992 | 39°F | 30°F | 0" | 0" |
| 1991 | 44°F | 35°F | 1.09" | 0" |
| 1990 | 44°F | 24°F | 2.03" | 7" |
| 1989 | 42°F | 37°F | 0" | 0" |
| 1988 | 46°F | 31°F | 1.12" | 0" |
| 1987 | 43°F | 33°F | 0" | 0" |
| 1986 | 49°F | 32°F | 0.1" | 0" |
| 1985 | 41°F | 37°F | 0" | 0" |
| 1984 | 35°F | 24°F | 0" | 0" |
| 1983 | 40°F | 30°F | 0" | 0" |
| 1982 | 49°F | 40°F | 0.41" | 0" |
| 1981 | 48°F | 43°F | 1.42" | 0" |
| 1980 | 47°F | 38°F | 0" | 0" |
| 1979 | 53°F | 50°F | 1.93" | 0" |
| 1978 | 44°F | 37°F | 0.13" | 0" |
| 1977 | 45°F | 40°F | 0.56" | 0" |
| 1976 | 50°F | 38°F | 0" | 0" |
| 1975 | 48°F | 31°F | 0" | 0" |
| 1974 | 52°F | 43°F | 0.97" | 0" |
| 1973 | 49°F | 40°F | 0" | 0" |
| 1972 | 55°F | 45°F | 2.21" | 0" |
| 1971 | 41°F | 36°F | 0.89" | 0" |