Weather on December 20
Boise, ID
55 Years of Data
About This Date
December 20th in Boise, ID typically brings cold winter weather, with average highs around 38°F and lows near 23°F. Over 55 years of records, the warmest December 20th was in 2019 (45°F average), while the coldest was 1990 (1°F) — a 44°F range across recorded history. Precipitation has occurred on 40% of recorded December 20th dates, with snow falling 16% of the time (heaviest snowfall: 9.8"). The last decade has been 6.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.5°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Boise, ID? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 45° | 30° | 37° | — | — |
| 2024 | 47° | 33° | 40° | — | — |
| 2023 | 42° | 31° | 37° | — | — |
| 2022 | 38° | 18° | 28° | — | — |
| 2021 | 50° | 30° | 40° | — | — |
| 2020 | 46° | 39° | 43° | 0.08" | — |
| 2019warmest | 50° | 40° | 45° | — | — |
| 2018 | 51° | 31° | 41° | — | — |
| 2017 | 51° | 28° | 40° | 0.28" | 0.3" |
| 2016 | 26° | 15° | 21° | 0.08" | 0.1" |
| 2015 | 40° | 26° | 33° | 0.1" | 0.2" |
| 2014 | 44° | 36° | 40° | 1.8" | — |
| 2013 | 31° | 11° | 21° | 0.51" | 2.3" |
| 2012 | 45° | 33° | 39° | — | — |
| 2011 | 44° | 21° | 33° | — | — |
| 2010 | 42° | 30° | 36° | — | — |
| 2009 | 43° | 30° | 36° | 0.03" | — |
| 2008 | 28° | 15° | 22° | — | — |
| 2007 | 43° | 29° | 36° | 0.13" | — |
| 2006 | 35° | 12° | 24° | — | — |
| 2005 | 35° | 29° | 32° | — | — |
| 2004 | 35° | 26° | 31° | — | — |
| 2003 | 43° | 30° | 36° | 0.15" | — |
| 2002 | 43° | 33° | 38° | — | — |
| 2001 | 46° | 30° | 38° | 0.05" | — |
| 2000 | 36° | 19° | 27° | 0.03" | 0.4" |
| 1999 | 45° | 28° | 36° | — | — |
| 1998 | 18° | 4° | 11° | — | — |
| 1997 | 39° | 23° | 31° | — | — |
| 1996 | 31° | 23° | 27° | 1.8" | 9.8" |
| 1995 | 31° | 20° | 25° | — | — |
| 1994 | 42° | 25° | 33° | — | — |
| 1993 | 33° | 17° | 25° | — | — |
| 1992 | 33° | 23° | 28° | 0.03" | 0.1" |
| 1991 | 38° | 18° | 28° | — | — |
| 1990coldest | 9° | -8° | 1° | 0.18" | 1.1" |
| 1989 | 36° | 16° | 26° | — | — |
| 1988 | 40° | 20° | 30° | 0.08" | — |
| 1987 | 36° | 17° | 26° | — | — |
| 1986 | 26° | 24° | 25° | — | — |
| 1985 | 12° | -1° | 6° | — | — |
| 1984 | 10° | -5° | 3° | 0.2" | 1.5" |
| 1983 | 16° | -6° | 5° | — | — |
| 1982 | 52° | 33° | 42° | 0.48" | — |
| 1981 | 49° | 37° | 43° | 0.3" | — |
| 1980 | 32° | 27° | 29° | — | — |
| 1979 | 50° | 34° | 42° | 0.15" | — |
| 1978 | 37° | 16° | 26° | — | — |
| 1977 | 32° | 21° | 27° | — | — |
| 1976 | 36° | 8° | 22° | — | — |
| 1975 | 23° | 14° | 19° | — | — |
| 1974 | 47° | 36° | 41° | 1.45" | — |
| 1973 | 46° | 32° | 39° | 0.38" | — |
| 1972 | 52° | 35° | 43° | 0.03" | — |
| 1971 | 41° | 16° | 28° | — | — |
Boise, ID Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Boise, ID Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Boise, ID 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 Boise, ID
Boise, ID has no months that meet our "pleasant" threshold — every season has tradeoffs.