Weather on December 15
Boise, ID
55 Years of Data
Avg High
39°F
Avg Low
25°F
Warmest
2002
47°F avg
Coldest
1985
5°F avg
About This Date
December 15th in Boise, ID typically brings cold winter weather, with average highs around 39°F and lows near 25°F. Over 55 years of records, the warmest December 15th was in 2002 (47°F average), while the coldest was 1985 (5°F) — a 42°F range across recorded history. Precipitation has occurred on 35% of recorded December 15th dates, with snow falling 18% of the time (heaviest snowfall: 3"). The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for December 15th in Boise, ID? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 41° | 28° | 35° | — | — |
| 2024 | 44° | 30° | 37° | 0.03" | — |
| 2023 | 40° | 28° | 34° | — | — |
| 2022 | 29° | 17° | 23° | — | — |
| 2021 | 33° | 19° | 26° | 0.03" | 0.1" |
| 2020 | 37° | 24° | 31° | 0.05" | 0.2" |
| 2019 | 37° | 27° | 32° | — | — |
| 2018 | 42° | 32° | 37° | — | — |
| 2017 | 29° | 26° | 28° | 0.13" | 0.5" |
| 2016 | 41° | 32° | 37° | 0.15" | — |
| 2015 | 39° | 28° | 34° | — | — |
| 2014 | 44° | 29° | 37° | — | — |
| 2013 | 34° | 21° | 28° | — | — |
| 2012 | 40° | 33° | 36° | — | — |
| 2011 | 36° | 20° | 28° | — | — |
| 2010 | 41° | 29° | 35° | — | — |
| 2009 | 39° | 35° | 37° | 2.08" | — |
| 2008 | 31° | 18° | 24° | 0.03" | — |
| 2007 | 35° | 29° | 32° | — | — |
| 2006 | 54° | 29° | 41° | — | — |
| 2005 | 23° | 9° | 16° | — | — |
| 2004 | 45° | 29° | 37° | — | — |
| 2003 | 39° | 29° | 34° | — | — |
| 2002warmest | 55° | 40° | 47° | 0.03" | — |
| 2001 | 35° | 23° | 29° | — | — |
| 2000 | 44° | 26° | 35° | 0.25" | 0.2" |
| 1999 | 38° | 33° | 35° | 0.23" | 0.5" |
| 1998 | 42° | 24° | 33° | — | — |
| 1997 | 44° | 29° | 36° | — | — |
| 1996 | 35° | 25° | 30° | — | — |
| 1995 | 46° | 36° | 41° | 0.48" | — |
| 1994 | 36° | 24° | 30° | — | — |
| 1993 | 46° | 23° | 35° | — | — |
| 1992 | 34° | 20° | 27° | 0.03" | 0.2" |
| 1991 | 36° | 20° | 28° | — | — |
| 1990 | 29° | 12° | 20° | — | — |
| 1989 | 46° | 23° | 35° | — | — |
| 1988 | 35° | 16° | 25° | — | — |
| 1987 | 37° | 26° | 32° | — | — |
| 1986 | 37° | 20° | 28° | — | — |
| 1985coldest | 15° | -5° | 5° | — | — |
| 1984 | 34° | 20° | 27° | 0.71" | 3" |
| 1983 | 42° | 25° | 33° | — | — |
| 1982 | 47° | 36° | 41° | 1.4" | — |
| 1981 | 49° | 41° | 45° | 0.2" | — |
| 1980 | 38° | 22° | 30° | — | — |
| 1979 | 50° | 28° | 39° | — | — |
| 1978 | 34° | 10° | 22° | — | — |
| 1977 | 52° | 38° | 45° | 0.84" | — |
| 1976 | 45° | 14° | 29° | — | — |
| 1975 | 35° | 21° | 28° | 0.2" | 0.8" |
| 1974 | 40° | 32° | 36° | 0.2" | 0.3" |
| 1973 | 49° | 36° | 42° | — | — |
| 1972 | 19° | -7° | 6° | — | — |
| 1971 | 33° | 20° | 26° | 0.03" | 0.2" |
55 years of data from BOISE AIR TERMINAL