Weather on December 20
Hillsboro, OR
55 Years of Data
Avg High
46°F
Avg Low
35°F
Warmest
1974
55°F avg
Coldest
1990
20°F avg
About This Date
December 20th in Hillsboro, OR typically brings chilly winter weather, with average highs around 46°F and lows near 35°F. Over 55 years of records, the warmest December 20th was in 1974 (55°F average), while the coldest was 1990 (20°F) — a 35°F range across recorded history. Precipitation has occurred on 75% of recorded December 20th dates, with snow falling 2% of the time (heaviest snowfall: 2.3"). The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 49° | 41° | 45° | 0.1" | — |
| 2024 | 53° | 41° | 47° | 0.03" | — |
| 2023 | 50° | 35° | 43° | — | — |
| 2022 | 48° | 34° | 41° | 0.15" | — |
| 2021 | 43° | 36° | 39° | 1.22" | — |
| 2020 | 53° | 46° | 50° | 3.15" | — |
| 2019 | 55° | 50° | 53° | 2.44" | — |
| 2018 | 56° | 36° | 46° | 0.23" | — |
| 2017 | 46° | 27° | 37° | 0.05" | — |
| 2016 | 50° | 29° | 40° | 0.94" | — |
| 2015 | 47° | 41° | 44° | 0.69" | — |
| 2014 | 57° | 47° | 52° | 2.82" | — |
| 2013 | 40° | 31° | 36° | 0.28" | — |
| 2012 | 47° | 30° | 39° | 1.65" | — |
| 2011 | 42° | 36° | 39° | — | — |
| 2010 | 46° | 37° | 42° | 1.19" | — |
| 2009 | 55° | 45° | 50° | 0.97" | — |
| 2008 | 30° | 21° | 26° | — | — |
| 2007 | 44° | 31° | 38° | 0.46" | — |
| 2006 | 38° | 30° | 34° | 1.24" | — |
| 2005 | 43° | 36° | 39° | 0.91" | — |
| 2004 | 48° | 28° | 38° | 0.03" | — |
| 2003 | 47° | 41° | 44° | 0.69" | — |
| 2002 | 47° | 36° | 41° | 0.18" | — |
| 2001 | 44° | 40° | 42° | 0.58" | — |
| 2000 | 42° | 38° | 40° | 0.64" | — |
| 1999 | 55° | 48° | 52° | — | — |
| 1998 | 25° | 15° | 20° | — | — |
| 1997 | 46° | 34° | 40° | 0.15" | — |
| 1996 | 49° | 40° | 44° | 0.48" | — |
| 1995 | 48° | 34° | 41° | 0.03" | — |
| 1994 | 53° | 44° | 49° | 1.17" | — |
| 1993 | 45° | 26° | 35° | — | — |
| 1992 | 45° | 35° | 40° | 0.58" | — |
| 1991 | 41° | 32° | 37° | — | — |
| 1990coldest | 27° | 13° | 20° | — | — |
| 1989 | 38° | 31° | 34° | — | — |
| 1988 | 44° | 37° | 41° | 0.05" | — |
| 1987 | 32° | 28° | 30° | 0.03" | — |
| 1986 | 46° | 29° | 37° | 0.03" | — |
| 1985 | 45° | 21° | 33° | — | — |
| 1984 | 33° | 15° | 24° | — | — |
| 1983 | 39° | 26° | 33° | — | — |
| 1982 | 45° | 36° | 40° | 3.2" | — |
| 1981 | 55° | 36° | 45° | 0.05" | — |
| 1980 | 43° | 35° | 39° | 0.38" | — |
| 1979 | 55° | 46° | 51° | 0.48" | — |
| 1978 | 36° | 30° | 33° | 0.94" | 2.3" |
| 1977 | 44° | 36° | 40° | — | — |
| 1976 | 44° | 27° | 35° | 0.08" | — |
| 1975 | 45° | 25° | 35° | — | — |
| 1974warmest | 61° | 49° | 55° | 0.38" | — |
| 1973 | 54° | 43° | 48° | 2.34" | — |
| 1972 | 58° | 51° | 54° | 1.4" | — |
| 1971 | 45° | 39° | 42° | 0.46" | — |
55 years of data from HILLSBORO