Weather on December 18
Seattle, WA
55 Years of Data
Avg High
47°F
Avg Low
37°F
Warmest
1979
52°F avg
Coldest
1984
30°F avg
About This Date
December 18th in 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 Seattle, WA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 52° | 42° | 47° | 0.33" | — |
| 2024 | 57° | 45° | 51° | 0.66" | — |
| 2023 | 48° | 38° | 43° | 0.03" | — |
| 2022 | 44° | 31° | 38° | 0.03" | — |
| 2021 | 52° | 37° | 44° | 1.07" | — |
| 2020 | 52° | 44° | 48° | 0.13" | — |
| 2019 | 48° | 37° | 43° | 0.13" | — |
| 2018 | 53° | 46° | 50° | 1.5" | — |
| 2017 | 51° | 42° | 47° | 1.75" | — |
| 2016 | 39° | 27° | 33° | — | — |
| 2015 | 51° | 42° | 47° | 1.37" | — |
| 2014 | 51° | 46° | 49° | 1.52" | — |
| 2013 | 46° | 39° | 43° | 0.1" | — |
| 2012 | 41° | 33° | 37° | 0.13" | — |
| 2011 | 48° | 38° | 43° | 0.38" | — |
| 2010 | 50° | 34° | 42° | 0.33" | — |
| 2009 | 56° | 43° | 49° | 0.08" | — |
| 2008 | 36° | 26° | 31° | 0.89" | — |
| 2007 | 48° | 39° | 44° | 1.22" | — |
| 2006 | 41° | 27° | 34° | — | — |
| 2005 | 48° | 27° | 37° | — | — |
| 2004 | 53° | 42° | 48° | 0.03" | — |
| 2003 | 57° | 33° | 45° | — | — |
| 2002 | 47° | 38° | 42° | 0.08" | — |
| 2001 | 46° | 36° | 41° | 0.41" | — |
| 2000 | 45° | 30° | 37° | — | — |
| 1999 | 50° | 44° | 47° | — | — |
| 1998 | 43° | 30° | 36° | — | — |
| 1997 | 48° | 34° | 41° | — | — |
| 1996 | 46° | 31° | 38° | — | — |
| 1995 | 47° | 43° | 45° | 0.53" | — |
| 1994 | 52° | 46° | 49° | 0.41" | — |
| 1993 | 43° | 32° | 37° | — | — |
| 1992 | 39° | 30° | 35° | — | — |
| 1991 | 44° | 35° | 40° | 1.09" | — |
| 1990 | 44° | 24° | 34° | 2.03" | 7" |
| 1989 | 42° | 37° | 40° | — | — |
| 1988 | 46° | 31° | 38° | 1.12" | — |
| 1987 | 43° | 33° | 38° | — | — |
| 1986 | 49° | 32° | 40° | 0.1" | — |
| 1985 | 41° | 37° | 39° | — | — |
| 1984coldest | 35° | 24° | 30° | — | — |
| 1983 | 40° | 30° | 35° | — | — |
| 1982 | 49° | 40° | 44° | 0.41" | — |
| 1981 | 48° | 43° | 45° | 1.42" | — |
| 1980 | 47° | 38° | 42° | — | — |
| 1979warmest | 53° | 50° | 52° | 1.93" | — |
| 1978 | 44° | 37° | 41° | 0.13" | — |
| 1977 | 45° | 40° | 42° | 0.56" | — |
| 1976 | 50° | 38° | 44° | — | — |
| 1975 | 48° | 31° | 39° | — | — |
| 1974 | 52° | 43° | 47° | 0.97" | — |
| 1973 | 49° | 40° | 44° | — | — |
| 1972 | 55° | 45° | 50° | 2.21" | — |
| 1971 | 41° | 36° | 38° | 0.89" | — |
55 years of data from SEATTLE URBAN SITE