Weather on December 31
Portland, OR
55 Years of Data
Avg High
44°F
Avg Low
35°F
Warmest
1996
54°F avg
Coldest
1978
18°F avg
About This Date
December 31st in Portland, OR typically brings chilly winter weather, with average highs around 44°F and lows near 35°F. Over 55 years of records, the warmest December 31st was in 1996 (54°F average), while the coldest was 1978 (18°F) — a 36°F range across recorded history. Precipitation has occurred on 60% of recorded December 31st dates, with snow falling 5% of the time (heaviest snowfall: 6"). The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Portland, OR? 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 | 48° | 36° | 42° | — | — |
| 2024 | 43° | 35° | 39° | 0.46" | — |
| 2023 | 44° | 40° | 42° | 0.03" | — |
| 2022 | 48° | 44° | 46° | 0.46" | — |
| 2021 | 37° | 26° | 32° | 0.23" | — |
| 2020 | 51° | 46° | 49° | 0.13" | — |
| 2019 | 50° | 41° | 46° | 0.99" | — |
| 2018 | 41° | 33° | 37° | — | — |
| 2017 | 47° | 34° | 40° | — | — |
| 2016 | 38° | 32° | 35° | 0.13" | — |
| 2015 | 37° | 32° | 35° | — | — |
| 2014 | 36° | 25° | 30° | — | — |
| 2013 | 47° | 38° | 42° | — | — |
| 2012 | 36° | 32° | 34° | — | — |
| 2011 | 43° | 33° | 38° | 0.05" | — |
| 2010 | 35° | 26° | 31° | — | — |
| 2009 | 50° | 35° | 43° | 1.73" | — |
| 2008 | 46° | 36° | 41° | 0.51" | — |
| 2007 | 41° | 33° | 37° | — | — |
| 2006 | 42° | 32° | 37° | — | — |
| 2005 | 52° | 45° | 48° | 0.86" | — |
| 2004 | 43° | 36° | 39° | 0.79" | — |
| 2003 | 39° | 31° | 35° | — | — |
| 2002 | 49° | 40° | 44° | 1.02" | — |
| 2001 | 45° | 38° | 41° | 0.48" | — |
| 2000 | 45° | 39° | 42° | 0.08" | — |
| 1999 | 42° | 35° | 39° | 0.28" | — |
| 1998 | 52° | 39° | 45° | 0.48" | — |
| 1997 | 45° | 36° | 40° | — | — |
| 1996warmest | 60° | 48° | 54° | 3.61" | — |
| 1995 | 53° | 43° | 48° | 0.3" | — |
| 1994 | 42° | 37° | 40° | — | — |
| 1993 | 50° | 37° | 44° | 0.48" | — |
| 1992 | 33° | 27° | 30° | 1.14" | 6" |
| 1991 | 50° | 39° | 45° | — | — |
| 1990 | 43° | 26° | 34° | 0.03" | — |
| 1989 | 48° | 35° | 42° | 1.14" | — |
| 1988 | 44° | 38° | 41° | 0.08" | — |
| 1987 | 37° | 32° | 35° | 0.91" | — |
| 1986 | 48° | 37° | 43° | 0.33" | — |
| 1985 | 35° | 31° | 33° | 0.1" | — |
| 1984 | 39° | 30° | 35° | — | — |
| 1983 | 47° | 37° | 42° | 0.05" | — |
| 1982 | 39° | 31° | 35° | — | — |
| 1981 | 37° | 31° | 34° | 0.71" | 1" |
| 1980 | 56° | 47° | 51° | — | — |
| 1979 | 51° | 39° | 45° | 3.18" | — |
| 1978coldest | 22° | 14° | 18° | 0.18" | 1" |
| 1977 | 40° | 28° | 34° | — | — |
| 1976 | 46° | 30° | 38° | — | — |
| 1975 | 42° | 35° | 39° | 0.03" | — |
| 1974 | 39° | 31° | 35° | — | — |
| 1973 | 41° | 33° | 37° | 0.23" | — |
| 1972 | 46° | 38° | 42° | — | — |
| 1971 | 48° | 41° | 45° | — | — |
55 years of data from PORTLAND KGW-TV