Weather on December 15
Portland, OR
55 Years of Data
Avg High
46°F
Avg Low
37°F
Warmest
1999
57°F avg
Coldest
2008
23°F avg
About This Date
December 15th in Portland, OR typically brings chilly winter weather, with average highs around 46°F and lows near 37°F. Over 55 years of records, the warmest December 15th was in 1999 (57°F average), while the coldest was 2008 (23°F) — a 34°F range across recorded history. Precipitation has occurred on 58% of recorded December 15th dates, with snow falling 2% of the time. The last decade has been 2.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.0°F cooler on this date compared to 20-30 years ago.
Planning for December 15th in Portland, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 43° | 51° | 1.45" | — |
| 2024 | 49° | 41° | 45° | 0.79" | — |
| 2023 | 50° | 44° | 47° | — | — |
| 2022 | 42° | 31° | 36° | — | — |
| 2021 | 40° | 37° | 38° | 1.12" | — |
| 2020 | 49° | 43° | 46° | 0.36" | — |
| 2019 | 43° | 37° | 40° | — | — |
| 2018 | 51° | 40° | 45° | 0.1" | — |
| 2017 | 39° | 32° | 36° | — | — |
| 2016 | 31° | 26° | 28° | — | — |
| 2015 | 40° | 36° | 38° | 0.23" | — |
| 2014 | 48° | 43° | 45° | — | — |
| 2013 | 46° | 37° | 42° | 0.03" | — |
| 2012 | 40° | 25° | 32° | 0.94" | — |
| 2011 | 43° | 35° | 39° | 0.1" | — |
| 2010 | 47° | 40° | 43° | 0.43" | — |
| 2009 | 51° | 37° | 44° | 3.84" | — |
| 2008coldest | 24° | 21° | 23° | — | — |
| 2007 | 48° | 40° | 44° | — | — |
| 2006 | 46° | 34° | 40° | 1.47" | — |
| 2005 | 33° | 28° | 31° | — | — |
| 2004 | 48° | 42° | 45° | — | — |
| 2003 | 46° | 39° | 43° | 0.03" | — |
| 2002 | 52° | 46° | 49° | 1.32" | — |
| 2001 | 48° | 39° | 44° | 0.48" | — |
| 2000 | 45° | 40° | 42° | 0.51" | — |
| 1999warmest | 62° | 51° | 57° | 0.23" | — |
| 1998 | 47° | 38° | 42° | — | — |
| 1997 | 48° | 40° | 44° | 1.14" | — |
| 1996 | 39° | 31° | 35° | — | — |
| 1995 | 47° | 40° | 43° | 0.3" | — |
| 1994 | 48° | 41° | 45° | 1.02" | — |
| 1993 | 47° | 42° | 44° | — | — |
| 1992 | 47° | 36° | 41° | 0.03" | — |
| 1991 | 44° | 34° | 39° | — | — |
| 1990 | 47° | 37° | 42° | 0.08" | — |
| 1989 | 39° | 35° | 37° | — | — |
| 1988 | 49° | 33° | 41° | — | — |
| 1987 | 38° | 32° | 35° | 0.05" | — |
| 1986 | 46° | 33° | 40° | — | — |
| 1985 | 44° | 31° | 37° | — | — |
| 1984 | 39° | 33° | 36° | — | — |
| 1983 | 46° | 35° | 41° | 0.03" | — |
| 1982 | 56° | 45° | 50° | 4.09" | — |
| 1981 | 52° | 40° | 46° | 1.42" | — |
| 1980 | 56° | 37° | 46° | — | — |
| 1979 | 57° | 40° | 48° | 0.05" | — |
| 1978 | 46° | 32° | 39° | — | — |
| 1977 | 51° | 40° | 45° | 1.8" | — |
| 1976 | 56° | 44° | 50° | — | — |
| 1975 | 46° | 40° | 43° | 1.14" | — |
| 1974 | 57° | 44° | 51° | 0.71" | — |
| 1973 | 54° | 45° | 49° | 0.38" | — |
| 1972 | 30° | 24° | 27° | 0.2" | 0.1" |
| 1971 | 45° | 38° | 41° | — | — |
55 years of data from PORTLAND KGW-TV