Weather on December 20
Seattle, WA
55 Years of Data
Avg High
46°F
Avg Low
36°F
Warmest
1972
53°F avg
Coldest
1990
16°F avg
About This Date
December 20th in Seattle, WA typically brings chilly winter weather, with average highs around 46°F and lows near 36°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 Seattle, WA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 46° | 42° | 44° | 0.69" | — |
| 2024 | 55° | 41° | 48° | — | — |
| 2023 | 54° | 36° | 45° | — | — |
| 2022 | 39° | 30° | 35° | 0.86" | — |
| 2021 | 39° | 36° | 37° | 0.15" | — |
| 2020 | 55° | 47° | 51° | — | — |
| 2019 | 55° | 47° | 51° | 3.99" | — |
| 2018 | 58° | 42° | 50° | 0.61" | — |
| 2017 | 45° | 29° | 37° | 0.18" | — |
| 2016 | 51° | 37° | 44° | 0.03" | — |
| 2015 | 49° | 43° | 46° | 0.48" | — |
| 2014 | 59° | 46° | 53° | 1.68" | — |
| 2013 | 45° | 33° | 39° | 0.25" | — |
| 2012 | 47° | 1° | 24° | 1.6" | — |
| 2011 | 45° | 38° | 41° | — | — |
| 2010 | 45° | 36° | 40° | 0.18" | — |
| 2009 | 58° | 46° | 52° | 0.36" | — |
| 2008 | 27° | 16° | 22° | 0.33" | — |
| 2007 | 45° | 31° | 38° | 0.2" | — |
| 2006 | 47° | 36° | 41° | 1.22" | — |
| 2005 | 52° | 45° | 48° | 0.84" | — |
| 2004 | 47° | 31° | 39° | — | — |
| 2003 | 50° | 45° | 47° | 0.23" | — |
| 2002 | 52° | 43° | 47° | — | — |
| 2001 | 42° | 39° | 41° | 0.23" | — |
| 2000 | 43° | 32° | 37° | 0.08" | — |
| 1999 | 48° | 43° | 45° | — | — |
| 1998 | 27° | 19° | 23° | — | — |
| 1997 | 46° | 37° | 42° | 0.51" | — |
| 1996 | 46° | 40° | 43° | 0.38" | — |
| 1995 | 54° | 38° | 46° | 0.05" | — |
| 1994 | 53° | 46° | 50° | 2.69" | — |
| 1993 | 44° | 30° | 37° | — | — |
| 1992 | 46° | 40° | 43° | 0.23" | — |
| 1991 | 46° | 35° | 41° | 0.33" | — |
| 1990coldest | 21° | 11° | 16° | — | — |
| 1989 | 49° | 45° | 47° | 0.23" | — |
| 1988 | 43° | 40° | 41° | 1.04" | — |
| 1987 | 43° | 32° | 37° | 0.94" | — |
| 1986 | 48° | 34° | 41° | — | — |
| 1985 | 38° | 33° | 35° | — | — |
| 1984 | 37° | 30° | 34° | 0.1" | 0.5" |
| 1983 | 29° | 21° | 25° | — | — |
| 1982 | 45° | 39° | 42° | 2.16" | — |
| 1981 | 46° | 37° | 42° | — | — |
| 1980 | 52° | 43° | 47° | 1.52" | — |
| 1979 | 50° | 44° | 47° | 0.58" | — |
| 1978 | 43° | 35° | 39° | 0.15" | — |
| 1977 | 50° | 29° | 39° | — | — |
| 1976 | 49° | 33° | 41° | — | — |
| 1975 | 44° | 33° | 39° | — | — |
| 1974 | 57° | 39° | 48° | 2.11" | — |
| 1973 | 56° | 44° | 50° | 1.27" | — |
| 1972warmest | 55° | 52° | 53° | 0.23" | — |
| 1971 | 42° | 36° | 39° | — | — |
55 years of data from SEATTLE URBAN SITE