Weather on December 1
Hillsboro, OR
55 Years of Data
Avg High
48°F
Avg Low
35°F
Warmest
1975
55°F avg
Coldest
1985
23°F avg
About This Date
December 1st in Hillsboro, OR typically brings chilly winter weather, with average highs around 48°F and lows near 35°F. Over 55 years of records, the warmest December 1st was in 1975 (55°F average), while the coldest was 1985 (23°F) — a 32°F range across recorded history. Precipitation has occurred on 69% of recorded December 1st dates, with snow falling 2% of the time (heaviest snowfall: 3.5"). The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
Planning for December 1st in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 48° | 29° | 38° | — | — |
| 2024 | 47° | 25° | 36° | — | — |
| 2023 | 52° | 37° | 44° | 1.37" | — |
| 2022 | 41° | 28° | 35° | 0.08" | — |
| 2021 | 53° | 41° | 47° | — | — |
| 2020 | 51° | 30° | 41° | — | — |
| 2019 | 42° | 33° | 38° | 0.36" | — |
| 2018 | 44° | 37° | 41° | 0.05" | — |
| 2017 | 48° | 43° | 45° | 0.13" | — |
| 2016 | 44° | 33° | 39° | 0.03" | — |
| 2015 | 45° | 32° | 38° | 2.16" | — |
| 2014 | 42° | 25° | 34° | — | — |
| 2013 | 58° | 44° | 51° | 1.65" | — |
| 2012 | 52° | 46° | 49° | 1.37" | — |
| 2011 | 50° | 25° | 38° | — | — |
| 2010 | 48° | 42° | 45° | 0.46" | — |
| 2009 | 52° | 30° | 41° | — | — |
| 2008 | 54° | 46° | 50° | 0.28" | — |
| 2007 | 40° | 28° | 34° | 0.66" | — |
| 2006 | 39° | 34° | 36° | 0.05" | — |
| 2005 | 42° | 34° | 38° | 0.81" | — |
| 2004 | 48° | 28° | 38° | 0.03" | — |
| 2003 | 50° | 40° | 45° | 0.23" | — |
| 2002 | 58° | 28° | 43° | — | — |
| 2001 | 48° | — | — | 3.73" | — |
| 2000 | 49° | 30° | 39° | 0.2" | — |
| 1999 | 53° | 48° | 51° | 1.83" | — |
| 1998 | 53° | 46° | 50° | 2.44" | — |
| 1997 | 52° | 45° | 48° | — | — |
| 1996 | 47° | 38° | 42° | 0.15" | — |
| 1995 | 54° | 44° | 49° | 0.89" | — |
| 1994 | 52° | 38° | 45° | 0.3" | — |
| 1993 | 50° | 37° | 44° | 3.3" | — |
| 1992 | 47° | 35° | 41° | 0.23" | — |
| 1991 | 40° | 31° | 35° | 0.33" | — |
| 1990 | 46° | 33° | 40° | 0.69" | — |
| 1989 | 50° | 33° | 42° | — | — |
| 1988 | 37° | 28° | 33° | — | — |
| 1987 | 54° | 38° | 46° | 1.85" | — |
| 1986 | 44° | 31° | 37° | — | — |
| 1985coldest | 24° | 21° | 23° | 0.41" | 3.5" |
| 1984 | 49° | 32° | 40° | 0.05" | — |
| 1983 | 44° | 34° | 39° | — | — |
| 1982 | 59° | 36° | 47° | 0.43" | — |
| 1981 | 48° | 35° | 42° | 0.89" | — |
| 1980 | 49° | 38° | 43° | 0.2" | — |
| 1979 | 46° | 33° | 40° | 0.03" | — |
| 1978 | 50° | 38° | 44° | 0.25" | — |
| 1977 | 57° | 42° | 50° | 0.08" | — |
| 1976 | 55° | 22° | 38° | — | — |
| 1975warmest | 58° | 52° | 55° | 0.18" | — |
| 1974 | 48° | 34° | 41° | — | — |
| 1973 | 52° | 40° | 46° | 0.03" | — |
| 1972 | 52° | 41° | 46° | — | — |
| 1971 | 41° | 30° | 36° | — | — |
55 years of data from HILLSBORO