Yellowstone National Park - Weather (U.S. National Park Service)

Summer: Daytime temperatures are often in the 70s (25C) and occasionally in the 80s (30C) in lower elevations. Nights are usually cool and temperatures may drop below freezing at higher elevations. Thunderstorms are common in the afternoons.

Winter: Temperatures often range from zero to 20F(-20 to -5C) throughout the day. Sub-zero temperatures over-night are common. The record low temperature is -66F (-54C). Snowfall is highly variable. While the average is 150 inches per year, it is not uncommon for higher elevations to get twice that amount.

Spring & Fall: Daytime temperatures range from the 30s to the 60s (0 to 20C) with overnight lows in the teens to single digits (-5 to -20C). Snow is common in the Spring and Fall with regular accumulations of 12" in a 24 hour period. At any time of year, be prepared for sudden changes. Unpredictability, more than anything else, characterizes Yellowstone’s weather. Always be equipped with a wide range of clothing options. Be sure to bring a warm jacket and rain gear even in the summer.

Weather Forecasts

We have weather reports and forecasts available from a few different sources.

Weather Links

Yellowstone Wildland Fire Weather Page
Yellowstone Daily Weather Reports - Winter Only
Regional Satellite Image - From NOAA
Regional Radar Image - From NOAA
Mammoth Hot Springs WebCam
Old Faithful WebCam

Yellowstone Historical Weather Information Links

Month	Average Maximum Temperature (F)	Average Minimum Temperature (F)	Average Precipitation (Inches)	Average Total Snow Fall (Inches)
Jan	28.6	9.6	1.1	14.5
Feb	34.0	13.0	0.75	10.4
March	39.6	17.2	1.1	13.1
April	49.4	26.0	1.2	5.9
May	60.4	34.3	2.0	1.5
June	70.0	41.2	1.5	0.1
July	79.6	46.7	1.5	0.0
Aug	78.3	45.3	1.4	0.0
Sep	67.8	37.0	1.3	0.5
Oct	55.7	29.4	1.0	3.7
Nov	38.7	19.2	1.0	9.0
Dec	30.5	11.8	1.0	13.5
Annual	52.8	27.6	15.4	72.1