West Yellowstone weather by month
What a typical year looks like in West Yellowstone, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at West Yellowstone Gateway, 2 km from West Yellowstone; records cover 2007–2026.
The year at a glance
- Precipitation a year
- 26 in660 mm
- Snow a year
- Rare
- Last spring freeze
- Jun 25
- First fall freeze
- Jul 7
- Heating degree days
- 10,849
- Cooling degree days
- 16
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −28°−33° (heating, 99%) and 88°31° (cooling, 1%).
Month by month
West Yellowstone in January
Highs average 27°−3° and lows 0°−18°, with 2.3 in58 mm of precipitation in a typical January.
- Record high
- 49°9° (2024)
- Record low
- −44°−42° (2023)
- Heating degree days
- 1596
- Cooling degree days
- 0
West Yellowstone in February
Highs average 31°0° and lows 2°−17°, with 2.1 in52 mm of precipitation in a typical February.
- Record high
- 52°11° (2026)
- Record low
- −47°−44° (2014)
- Heating degree days
- 1362
- Cooling degree days
- 0
West Yellowstone in March
Highs average 40°4° and lows 9°−13°, with 2.2 in55 mm of precipitation in a typical March.
- Record high
- 65°18° (2026)
- Record low
- −34°−37° (2019)
- Heating degree days
- 1259
- Cooling degree days
- 0
West Yellowstone in April
Highs average 48°9° and lows 21°−6°, with 2.3 in59 mm of precipitation in a typical April.
- Record high
- 74°23° (2012)
- Record low
- −15°−26° (2022)
- Heating degree days
- 924
- Cooling degree days
- 0
West Yellowstone in May
Highs average 59°15° and lows 29°−2°, with 2.7 in69 mm of precipitation in a typical May.
- Record high
- 84°29° (2020)
- Record low
- 8°−13° (2022)
- Heating degree days
- 656
- Cooling degree days
- 0
West Yellowstone in June
Highs average 68°20° and lows 34°1°, with 2.5 in63 mm of precipitation in a typical June.
- Record high
- 91°33° (2015)
- Record low
- 16°−9° (2018)
- Heating degree days
- 416
- Cooling degree days
- 0
West Yellowstone in July
Highs average 80°27° and lows 39°4°, with 1.3 in33 mm of precipitation in a typical July.
- Record high
- 96°36° (2026)
- Record low
- 23°−5° (2010)
- Heating degree days
- 184
- Cooling degree days
- 12
West Yellowstone in August
Highs average 78°26° and lows 36°2°, with 1.4 in35 mm of precipitation in a typical August.
- Record high
- 94°34° (2018)
- Record low
- 16°−9° (2018)
- Heating degree days
- 251
- Cooling degree days
- 4
West Yellowstone in September
Highs average 68°20° and lows 30°−1°, with 1.7 in43 mm of precipitation in a typical September.
- Record high
- 90°32° (2022)
- Record low
- 13°−11° (2014)
- Heating degree days
- 492
- Cooling degree days
- 0
West Yellowstone in OctoberThis month
Highs average 51°10° and lows 21°−6°, with 1.9 in49 mm of precipitation in a typical October.
- Record high
- 81°27° (2010)
- Record low
- −22°−30° (2020)
- Heating degree days
- 896
- Cooling degree days
- 0
West Yellowstone in November
Highs average 36°2° and lows 11°−11°, with 2.6 in66 mm of precipitation in a typical November.
- Record high
- 63°17° (2014)
- Record low
- −26°−32° (2022)
- Heating degree days
- 1240
- Cooling degree days
- 0
West Yellowstone in December
Highs average 26°−3° and lows 3°−16°, with 3.1 in77 mm of precipitation in a typical December.
- Record high
- 48°9° (2014)
- Record low
- −49°−45° (2022)
- Heating degree days
- 1573
- Cooling degree days
- 0