Weather on December 21
Hillsboro, OR
55 Years of Data
Avg High
44°F
Avg Low
33°F
Warmest
1972
55°F avg
Coldest
1990
13°F avg
About This Date
December 21st in Hillsboro, OR typically brings chilly winter weather, with average highs around 44°F and lows near 33°F. Over 55 years of records, the warmest December 21st was in 1972 (55°F average), while the coldest was 1990 (13°F) — a 42°F range across recorded history. Precipitation has occurred on 67% of recorded December 21st dates, with snow falling 2% of the time (heaviest snowfall: 1.8"). The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 44° | 36° | 40° | 0.13" | — |
| 2024 | 54° | 40° | 47° | 0.38" | — |
| 2023 | 41° | 35° | 38° | — | — |
| 2022 | 41° | 24° | 33° | — | — |
| 2021 | 42° | 33° | 38° | 0.3" | — |
| 2020 | 59° | 41° | 50° | 0.71" | — |
| 2019 | 51° | 44° | 48° | 1.55" | — |
| 2018 | 46° | 29° | 38° | — | — |
| 2017 | 36° | 23° | 30° | — | — |
| 2016 | 36° | 27° | 32° | — | — |
| 2015 | 50° | 40° | 45° | 2.03" | — |
| 2014 | 57° | 49° | 53° | 0.05" | — |
| 2013 | 49° | 39° | 44° | 0.08" | — |
| 2012 | 46° | 29° | 38° | 0.3" | — |
| 2011 | 42° | 26° | 34° | — | — |
| 2010 | 47° | 36° | 41° | — | — |
| 2009 | 52° | 32° | 42° | 0.56" | — |
| 2008 | 25° | 22° | 24° | — | — |
| 2007 | 41° | 29° | 35° | — | — |
| 2006 | 50° | 32° | 41° | 0.43" | — |
| 2005 | 54° | 38° | 46° | 2.44" | — |
| 2004 | 42° | 28° | 35° | 0.18" | — |
| 2003 | 51° | 36° | 43° | 0.05" | — |
| 2002 | 47° | 41° | 44° | 0.28" | — |
| 2001 | 41° | 36° | 38° | 0.61" | — |
| 2000 | 47° | 32° | 39° | 1.3" | — |
| 1999 | 59° | 32° | 46° | — | — |
| 1998 | 22° | 10° | 16° | 0.23" | — |
| 1997 | 39° | 31° | 35° | 0.05" | — |
| 1996 | 42° | 35° | 39° | 1.14" | — |
| 1995 | 50° | 34° | 42° | — | — |
| 1994 | 51° | 41° | 46° | 0.05" | — |
| 1993 | 43° | 26° | 34° | — | — |
| 1992 | 46° | 38° | 42° | 0.58" | — |
| 1991 | 44° | 31° | 37° | 0.86" | — |
| 1990coldest | 18° | 9° | 13° | — | — |
| 1989 | 37° | 33° | 35° | — | — |
| 1988 | 44° | 38° | 41° | 0.91" | — |
| 1987 | 40° | 31° | 35° | 0.53" | — |
| 1986 | 40° | 29° | 34° | 0.1" | — |
| 1985 | 40° | 21° | 30° | — | — |
| 1984 | 31° | 18° | 24° | 0.53" | 1.8" |
| 1983 | 28° | 16° | 22° | — | — |
| 1982 | 49° | 43° | 46° | 0.74" | — |
| 1981 | 45° | 36° | 40° | 0.84" | — |
| 1980 | 46° | 40° | 43° | 2.01" | — |
| 1979 | 51° | 45° | 48° | 2.03" | — |
| 1978 | 43° | 33° | 38° | 0.2" | — |
| 1977 | 47° | 33° | 40° | — | — |
| 1976 | 37° | 30° | 34° | — | — |
| 1975 | 42° | 27° | 34° | 0.28" | — |
| 1974 | 54° | 36° | 45° | 1.93" | — |
| 1973 | 56° | 43° | 49° | 0.51" | — |
| 1972warmest | 59° | 52° | 55° | 4.75" | — |
| 1971 | 43° | 38° | 40° | 3.18" | — |
55 years of data from HILLSBORO