Weather on December 31
Seattle, WA
55 Years of Data
Avg High
45°F
Avg Low
35°F
Warmest
1995
50°F avg
Coldest
1978
20°F avg
About This Date
December 31st in Seattle, WA typically brings chilly winter weather, with average highs around 45°F and lows near 35°F. Over 55 years of records, the warmest December 31st was in 1995 (50°F average), while the coldest was 1978 (20°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 40% of December 31st dates historically, with the wettest December 31st recording 3.66" of rain. The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Seattle, WA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 43° | 33° | 38° | — | — |
| 2024 | 46° | 34° | 40° | — | — |
| 2023 | 51° | 37° | 44° | — | — |
| 2022 | 49° | 43° | 46° | — | — |
| 2021 | 33° | 17° | 25° | — | — |
| 2020 | 51° | 46° | 49° | 0.05" | — |
| 2019 | 55° | 45° | 50° | 0.2" | — |
| 2018 | 44° | 32° | 38° | — | — |
| 2017 | 44° | 34° | 39° | — | — |
| 2016 | 40° | 31° | 36° | — | — |
| 2015 | 43° | 24° | 34° | — | — |
| 2014 | 41° | 25° | 33° | — | — |
| 2013 | 48° | 40° | 44° | — | — |
| 2012 | 41° | 31° | 36° | — | — |
| 2011 | 44° | 32° | 38° | — | — |
| 2010 | 38° | 21° | 30° | — | — |
| 2009 | 48° | 36° | 42° | 0.66" | — |
| 2008 | 44° | 37° | 41° | 0.08" | — |
| 2007 | 44° | 33° | 39° | — | — |
| 2006 | 48° | 32° | 40° | — | — |
| 2005 | 50° | 45° | 47° | 0.91" | — |
| 2004 | 47° | 30° | 38° | — | — |
| 2003 | 38° | 32° | 35° | 0.15" | — |
| 2002 | 48° | 39° | 44° | 0.3" | — |
| 2001 | 54° | 38° | 46° | 0.36" | — |
| 2000 | 50° | 40° | 45° | 0.61" | — |
| 1999 | 46° | 37° | 42° | 0.43" | — |
| 1998 | 50° | 43° | 46° | 0.79" | — |
| 1997 | 49° | 38° | 43° | 0.33" | — |
| 1996 | 56° | 43° | 49° | 3.66" | — |
| 1995warmest | 54° | 46° | 50° | 0.08" | — |
| 1994 | 52° | 29° | 40° | — | — |
| 1993 | 50° | 45° | 47° | 1.24" | — |
| 1992 | 35° | 29° | 32° | — | — |
| 1991 | 48° | 34° | 41° | — | — |
| 1990 | 45° | 39° | 42° | — | — |
| 1989 | 49° | 41° | 45° | 0.36" | — |
| 1988 | 43° | 39° | 41° | 0.43" | — |
| 1987 | 44° | 30° | 37° | — | — |
| 1986 | 49° | 36° | 42° | 0.28" | — |
| 1985 | 43° | 35° | 39° | 0.15" | — |
| 1984 | 36° | 26° | 31° | — | — |
| 1983 | 51° | 38° | 44° | — | — |
| 1982 | 41° | 27° | 34° | — | — |
| 1981 | 39° | 33° | 36° | 0.13" | — |
| 1980 | 52° | 47° | 49° | 0.05" | — |
| 1979 | 55° | 43° | 49° | 0.58" | — |
| 1978coldest | 26° | 14° | 20° | — | — |
| 1977 | 43° | 28° | 35° | — | — |
| 1976 | 42° | 32° | 37° | — | — |
| 1975 | 46° | 32° | 39° | — | — |
| 1974 | 41° | 32° | 37° | — | — |
| 1973 | 43° | 30° | 36° | — | — |
| 1972 | 46° | 40° | 43° | — | — |
| 1971 | 46° | 41° | 44° | — | — |
55 years of data from SEATTLE URBAN SITE