Weather on October 20
West Yellowstone, MT
55 Years of Data
About This Date
October 20th in West Yellowstone, MT typically brings chilly fall weather, with average highs around 45°F and lows near 25°F. Over 55 years of records, the warmest October 20th was in 2023 (49°F average), while the coldest was 1984 (12°F) — a 37°F range across recorded history. Precipitation has occurred on 20% of recorded October 20th dates, with snow falling 2% of the time (heaviest snowfall: 3"). The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in West Yellowstone, MT? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 28° | 18° | 23° | — | — |
| 2024 | 51° | 33° | 42° | — | — |
| 2023warmest | 60° | 37° | 49° | — | — |
| 2022 | 58° | 36° | 47° | — | — |
| 2021 | 41° | 27° | 34° | 0.25" | — |
| 2020 | 39° | 29° | 34° | — | — |
| 2019 | 28° | 15° | 22° | 0.25" | — |
| 2018 | 57° | 35° | 46° | — | — |
| 2017 | 40° | 15° | 28° | — | — |
| 2016 | 33° | 20° | 27° | — | — |
| 2015 | 34° | 29° | 31° | 0.51" | — |
| 2014 | 57° | 35° | 46° | — | — |
| 2013 | 39° | 23° | 31° | — | — |
| 2012 | 39° | 26° | 33° | 0.25" | — |
| 2011 | 45° | 28° | 36° | — | — |
| 2010 | 57° | 34° | 45° | — | — |
| 2009 | 35° | 18° | 27° | — | — |
| 2008 | 48° | 28° | 38° | — | — |
| 2007 | 33° | 13° | 23° | — | — |
| 2006 | 33° | 15° | 24° | 0.51" | — |
| 2005 | 42° | 28° | 35° | — | — |
| 2004 | 33° | 23° | 28° | 0.76" | — |
| 2003 | 55° | 38° | 47° | — | — |
| 2002 | 41° | 26° | 34° | — | — |
| 2001 | 41° | 27° | 34° | — | — |
| 2000 | 43° | 28° | 35° | — | — |
| 1999 | 50° | 27° | 39° | — | — |
| 1998 | 51° | 20° | 36° | 0.25" | — |
| 1997 | 45° | 22° | 33° | — | — |
| 1996 | 21° | 3° | 12° | — | — |
| 1995 | 43° | 22° | 32° | 0.25" | — |
| 1994 | 39° | 23° | 31° | — | — |
| 1993 | 41° | 13° | 27° | — | — |
| 1992 | 53° | 32° | 42° | — | — |
| 1991 | 51° | 24° | 37° | — | — |
| 1990 | 31° | 5° | 18° | 0.25" | — |
| 1989 | 50° | 33° | 42° | — | — |
| 1988 | 47° | 26° | 37° | — | — |
| 1987 | 47° | 17° | 32° | — | — |
| 1986 | 55° | 29° | 42° | — | — |
| 1985 | 49° | 32° | 41° | — | — |
| 1984coldest | 21° | 4° | 12° | — | — |
| 1983 | 55° | 25° | 40° | — | — |
| 1982 | 40° | 18° | 29° | — | — |
| 1981 | 49° | 33° | 41° | — | — |
| 1980 | 52° | 28° | 40° | — | — |
| 1979 | 45° | 30° | 37° | 0.81" | 3" |
| 1978 | 59° | 35° | 47° | — | — |
| 1977 | 54° | 29° | 41° | — | — |
| 1976 | 50° | 19° | 35° | — | — |
| 1975 | 56° | 32° | 44° | — | — |
| 1974 | 61° | 27° | 44° | — | — |
| 1973 | 61° | 31° | 46° | — | — |
| 1972 | 58° | 38° | 48° | 0.3" | — |
| 1971 | 43° | 25° | 34° | — | — |
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.