Weather on December 9
Boise, ID
55 Years of Data
Avg High
38°F
Avg Low
25°F
Warmest
1996
52°F avg
Coldest
1972
-8°F avg
About This Date
December 9th in Boise, ID typically brings cold winter weather, with average highs around 38°F and lows near 25°F. Over 55 years of records, the warmest December 9th was in 1996 (52°F average), while the coldest was 1972 (-8°F) — a 60°F range across recorded history. Precipitation has occurred on 35% of recorded December 9th dates, with snow falling 13% of the time (heaviest snowfall: 1.4"). The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for December 9th in Boise, ID? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 56° | 46° | 51° | 0.08" | — |
| 2024 | 38° | 26° | 32° | — | — |
| 2023 | 39° | 24° | 32° | — | — |
| 2022 | 40° | 29° | 35° | 0.33" | 1.3" |
| 2021 | 37° | 30° | 34° | 0.03" | 0.4" |
| 2020 | 39° | 20° | 30° | — | — |
| 2019 | 45° | 29° | 37° | — | — |
| 2018 | 37° | 28° | 33° | — | — |
| 2017 | 30° | 26° | 28° | — | — |
| 2016 | 31° | 25° | 28° | 0.64" | — |
| 2015 | 56° | 39° | 47° | 0.03" | — |
| 2014 | 49° | 36° | 42° | — | — |
| 2013 | 14° | -7° | 4° | — | — |
| 2012 | 37° | 25° | 31° | 0.03" | 0.1" |
| 2011 | 40° | 18° | 29° | — | — |
| 2010 | 44° | 29° | 36° | — | — |
| 2009 | 16° | -4° | 6° | — | — |
| 2008 | 42° | 23° | 33° | — | — |
| 2007 | 31° | 18° | 24° | — | — |
| 2006 | 48° | 29° | 38° | 0.1" | — |
| 2005 | 25° | 12° | 18° | — | — |
| 2004 | 45° | 39° | 42° | 1.02" | — |
| 2003 | 42° | 32° | 37° | — | — |
| 2002 | 35° | 24° | 30° | — | — |
| 2001 | 36° | 24° | 30° | — | — |
| 2000 | 33° | 30° | 32° | 0.03" | — |
| 1999 | 38° | 31° | 34° | 0.13" | 0.6" |
| 1998 | 35° | 17° | 26° | — | — |
| 1997 | 36° | 23° | 29° | — | — |
| 1996warmest | 57° | 46° | 52° | 0.1" | — |
| 1995 | 33° | 28° | 31° | 0.13" | — |
| 1994 | 30° | 15° | 23° | — | — |
| 1993 | 57° | 33° | 45° | — | — |
| 1992 | 39° | 33° | 36° | 0.1" | — |
| 1991 | 43° | 26° | 34° | — | — |
| 1990 | 52° | 20° | 36° | — | — |
| 1989 | 42° | 26° | 34° | — | — |
| 1988 | 37° | 32° | 35° | 0.03" | — |
| 1987 | 47° | 31° | 39° | 0.76" | 0.3" |
| 1986 | 32° | 11° | 21° | — | — |
| 1985 | 27° | 15° | 21° | — | — |
| 1984 | 35° | 25° | 30° | — | — |
| 1983 | 48° | 34° | 41° | 0.33" | — |
| 1982 | 35° | 21° | 28° | — | — |
| 1981 | 56° | 34° | 45° | — | — |
| 1980 | 32° | 8° | 20° | — | — |
| 1979 | 45° | 30° | 37° | — | — |
| 1978 | 32° | 21° | 27° | 0.08" | 0.6" |
| 1977 | 41° | 29° | 35° | — | — |
| 1976 | 43° | 22° | 32° | 0.05" | — |
| 1975 | 38° | 34° | 36° | — | — |
| 1974 | 37° | 23° | 30° | — | — |
| 1973 | 42° | 26° | 34° | — | — |
| 1972coldest | 5° | -21° | -8° | — | — |
| 1971 | 36° | 27° | 31° | 0.13" | 1.4" |
55 years of data from BOISE AIR TERMINAL