Weather on December 21
West Yellowstone, MT
55 Years of Data
About This Date
December 21st in West Yellowstone, MT typically brings very cold winter weather, with average highs around 21°F and lows near 7°F. Over 55 years of records, the warmest December 21st was in 1972 (29°F average), while the coldest was 1998 (-20°F) — a 49°F range across recorded history. Precipitation has occurred on 51% of recorded December 21st dates, with snow falling 15% of the time (heaviest snowfall: 7"). The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in West Yellowstone, MT? 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 | 31° | 11° | 21° | 1.27" | — |
| 2024 | 32° | 24° | 28° | 0.25" | — |
| 2023 | 34° | 23° | 28° | — | — |
| 2022 | 13° | -29° | -8° | — | — |
| 2021 | 24° | 14° | 19° | — | — |
| 2020 | 30° | 23° | 26° | — | — |
| 2019 | 26° | 17° | 22° | — | — |
| 2018 | 23° | 6° | 14° | 0.76" | — |
| 2017 | 17° | -6° | 5° | 0.51" | — |
| 2016 | 17° | 4° | 11° | — | — |
| 2015 | 19° | 8° | 13° | 1.27" | — |
| 2014 | 26° | 18° | 22° | 2.54" | — |
| 2013 | 19° | 4° | 11° | 1.02" | — |
| 2012 | 19° | 8° | 14° | — | — |
| 2011 | 15° | 4° | 9° | 1.02" | — |
| 2010 | 21° | 5° | 13° | 0.25" | — |
| 2009 | 22° | 20° | 21° | 0.51" | — |
| 2008 | 12° | -10° | 1° | 2.03" | — |
| 2007 | 13° | -4° | 4° | — | — |
| 2006 | 28° | 12° | 20° | — | — |
| 2005 | 30° | 25° | 27° | — | — |
| 2004 | 14° | -2° | 6° | — | — |
| 2003 | 24° | 11° | 17° | — | — |
| 2002 | 17° | 5° | 11° | — | — |
| 2001 | 25° | 12° | 18° | — | — |
| 2000 | 18° | -1° | 9° | 0.25" | — |
| 1999 | 17° | 11° | 14° | 2.29" | — |
| 1998coldest | -9° | -31° | -20° | — | — |
| 1997 | 15° | 5° | 10° | 0.25" | — |
| 1996 | 17° | 6° | 11° | 0.25" | — |
| 1995 | 21° | 1° | 11° | — | — |
| 1994 | 34° | 16° | 25° | — | — |
| 1993 | 23° | 8° | 16° | 0.25" | 3" |
| 1992 | 12° | 5° | 9° | 0.25" | — |
| 1991 | 29° | 12° | 20° | — | — |
| 1990 | -9° | -30° | -19° | — | — |
| 1989 | 17° | 4° | 11° | 0.25" | — |
| 1988 | 20° | 5° | 13° | 2.03" | — |
| 1987 | 18° | 5° | 11° | 0.25" | — |
| 1986 | 26° | 9° | 18° | — | — |
| 1985 | 38° | 21° | 29° | — | — |
| 1984 | 10° | 1° | 6° | 0.76" | — |
| 1983 | -3° | -29° | -16° | — | — |
| 1982 | 25° | 33° | 29° | 1.83" | 7" |
| 1981 | 35° | 21° | 28° | — | — |
| 1980 | 31° | 24° | 27° | 1.5" | 7" |
| 1979 | 30° | 23° | 27° | 0.1" | 1" |
| 1978 | 18° | 8° | 13° | 0.33" | 3" |
| 1977 | 3° | -15° | -6° | — | — |
| 1976 | 10° | -12° | -1° | — | — |
| 1975 | 9° | -7° | 1° | — | — |
| 1974 | 34° | 19° | 26° | 0.51" | 3" |
| 1973 | 31° | 5° | 18° | — | — |
| 1972warmest | 33° | 25° | 29° | 1.37" | 4" |
| 1971 | 32° | 14° | 23° | 0.18" | 1" |
West Yellowstone, MT Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
West Yellowstone, MT Monthly Precipitation
Average rainfall and snowfall per month, in inches.
West Yellowstone, MT 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 West Yellowstone, MT
West Yellowstone, MT has no months that meet our "pleasant" threshold — every season has tradeoffs.