Weather on December 31
Boise, ID
55 Years of Data
About This Date
December 31st in Boise, ID typically brings cold winter weather, with average highs around 34°F and lows near 21°F. Over 55 years of records, the warmest December 31st was in 1996 (53°F average), while the coldest was 1978 (1°F) — a 52°F range across recorded history. Precipitation has occurred on 36% of recorded December 31st dates, with snow falling 24% of the time (heaviest snowfall: 3"). The last decade has been 6.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 6.6°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Boise, ID? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella. Check road conditions if traveling, as snow is possible.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 42° | 26° | 34° | — | — |
| 2024 | 37° | 23° | 30° | — | — |
| 2023 | 47° | 27° | 37° | — | — |
| 2022 | 39° | 29° | 34° | 0.03" | — |
| 2021 | 30° | 9° | 20° | — | — |
| 2020 | 38° | 29° | 34° | 0.03" | 0.2" |
| 2019 | 40° | 32° | 36° | 0.03" | — |
| 2018 | 37° | 19° | 28° | — | — |
| 2017 | 36° | 19° | 28° | — | — |
| 2016 | 20° | 8° | 14° | — | — |
| 2015 | 22° | 11° | 17° | — | — |
| 2014 | 19° | 9° | 14° | — | — |
| 2013 | 36° | 24° | 30° | — | — |
| 2012 | 26° | 13° | 19° | — | — |
| 2011 | 39° | 26° | 33° | — | — |
| 2010 | 24° | 13° | 18° | — | — |
| 2009 | 38° | 30° | 34° | 0.41" | 1.4" |
| 2008 | 43° | 29° | 36° | — | — |
| 2007 | 32° | 15° | 24° | — | — |
| 2006 | 32° | 24° | 28° | — | — |
| 2005 | 49° | 43° | 46° | 0.43" | — |
| 2004 | 39° | 32° | 36° | — | — |
| 2003 | 36° | 24° | 30° | 0.33" | 1.7" |
| 2002 | 44° | 34° | 39° | 0.3" | — |
| 2001 | 33° | 29° | 31° | 0.36" | 3" |
| 2000 | 31° | 25° | 28° | — | — |
| 1999 | 26° | 24° | 25° | 0.03" | 0.1" |
| 1998 | 42° | 34° | 38° | 0.56" | — |
| 1997 | 44° | 26° | 35° | — | — |
| 1996warmest | 58° | 48° | 53° | 0.13" | — |
| 1995 | 44° | 32° | 38° | 0.05" | — |
| 1994 | 31° | 16° | 23° | — | — |
| 1993 | 42° | 25° | 33° | 0.05" | 0.2" |
| 1992 | 38° | 28° | 33° | — | — |
| 1991 | 35° | 31° | 33° | — | — |
| 1990 | 19° | 6° | 13° | — | — |
| 1989 | 43° | 20° | 31° | — | — |
| 1988 | 30° | 23° | 27° | 0.08" | 0.4" |
| 1987 | 35° | 25° | 30° | 0.33" | 1.3" |
| 1986 | 34° | 11° | 22° | — | — |
| 1985 | 19° | 2° | 10° | — | — |
| 1984 | 33° | 19° | 26° | — | — |
| 1983 | 30° | 25° | 27° | 0.08" | 0.2" |
| 1982 | 20° | 5° | 12° | — | — |
| 1981 | 33° | 5° | 19° | 0.15" | 0.8" |
| 1980 | 37° | 32° | 35° | — | — |
| 1979 | 48° | 30° | 39° | — | — |
| 1978coldest | 11° | -9° | 1° | 0.05" | 0.2" |
| 1977 | 33° | 8° | 21° | 0.1" | 0.7" |
| 1976 | 35° | 12° | 24° | — | — |
| 1975 | 33° | 20° | 26° | — | — |
| 1974 | 25° | 1° | 13° | — | — |
| 1973 | 32° | 23° | 28° | 0.03" | 0.1" |
| 1972 | 39° | 23° | 31° | — | — |
| 1971 | 31° | 17° | 24° | — | — |