Weather on December 31
Hillsboro, OR
55 Years of Data
About This Date
December 31st in Hillsboro, OR typically brings chilly winter weather, with average highs around 44°F and lows near 32°F. Over 55 years of records, the warmest December 31st was in 1980 (54°F average), while the coldest was 1978 (18°F) — a 36°F range across recorded history. Precipitation has occurred on 55% of recorded December 31st dates, with snow falling 2% of the time. 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 31st 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 | 47° | 26° | 36° | — | — |
| 2024 | 51° | 33° | 42° | 0.13" | — |
| 2023 | 44° | 40° | 42° | — | — |
| 2022 | 49° | 36° | 42° | 0.2" | — |
| 2021 | 39° | 24° | 32° | 0.1" | — |
| 2020 | 51° | 45° | 48° | 0.1" | — |
| 2019 | 50° | 39° | 45° | 0.51" | — |
| 2018 | 46° | 28° | 37° | — | — |
| 2017 | 50° | 25° | 38° | — | — |
| 2016 | 35° | 24° | 30° | 0.25" | — |
| 2015 | 38° | 31° | 35° | — | — |
| 2014 | 39° | 19° | 29° | — | — |
| 2013 | 48° | 35° | 42° | 0.05" | — |
| 2012 | 35° | 25° | 30° | 0.03" | — |
| 2011 | 39° | 27° | 33° | — | — |
| 2010 | 35° | 22° | 29° | — | — |
| 2009 | 48° | 31° | 40° | 2.03" | — |
| 2008 | 45° | 39° | 42° | 0.15" | — |
| 2007 | 40° | 28° | 34° | — | — |
| 2006 | 41° | 27° | 34° | — | — |
| 2005 | 51° | 44° | 48° | 0.64" | — |
| 2004 | 43° | 31° | 37° | 1.47" | — |
| 2003 | 39° | 31° | 35° | 0.51" | — |
| 2002 | 47° | 41° | 44° | 3.53" | — |
| 2001 | 45° | 30° | 37° | 0.56" | — |
| 2000 | 46° | 37° | 42° | 0.08" | — |
| 1999 | 44° | 37° | 41° | 0.81" | — |
| 1998 | 54° | 36° | 45° | — | — |
| 1997 | 51° | 37° | 44° | 0.05" | — |
| 1996 | 58° | 48° | 53° | 3.96" | — |
| 1995 | 55° | 40° | 47° | — | — |
| 1994 | 43° | 34° | 38° | — | — |
| 1993 | 44° | 35° | 40° | 1.07" | — |
| 1992 | 38° | 28° | 33° | 0.3" | 1" |
| 1991 | 47° | 31° | 39° | — | — |
| 1990 | 30° | 15° | 23° | — | — |
| 1989 | 44° | 36° | 40° | — | — |
| 1988 | 47° | 34° | 40° | 0.25" | — |
| 1987 | 35° | 23° | 29° | 0.2" | — |
| 1986 | 45° | 36° | 40° | 0.25" | — |
| 1985 | 40° | 30° | 35° | — | — |
| 1984 | 46° | 27° | 36° | — | — |
| 1983 | 37° | 32° | 35° | 0.23" | — |
| 1982 | 41° | 23° | 32° | — | — |
| 1981 | 40° | 31° | 35° | 0.1" | — |
| 1980warmest | 62° | 46° | 54° | 0.05" | — |
| 1979 | 48° | 38° | 43° | 0.76" | — |
| 1978coldest | 21° | 14° | 18° | — | — |
| 1977 | 41° | 30° | 36° | — | — |
| 1976 | 48° | 24° | 36° | — | — |
| 1975 | 45° | 30° | 37° | — | — |
| 1974 | 39° | 32° | 36° | — | — |
| 1973 | 42° | 32° | 37° | 0.08" | — |
| 1972 | 47° | 33° | 40° | — | — |
| 1971 | 43° | 38° | 40° | 0.03" | — |
Hillsboro, OR Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Hillsboro, OR Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Hillsboro, OR Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Hillsboro, OR
Hillsboro, OR has no months that meet our "pleasant" threshold — every season has tradeoffs.