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Is Mammoth Mountain snowsure?

The snowiest week in Mammoth Mountain is week 3 of February. There are typically 2.8 snowy days during this week with 36cm of snowfall. Check out the Mammoth Mountain Snow History graphs below. Select any week of the year to see the typical Ski Conditions, Snowfall Amount and Temperature based on nowcast weather data over the last 11 years.

Average monthly snow in Mammoth Mountain

MonthSnow amount (week)Snow days (week)
December17cm2.0 days
January32cm2.2 days
February24cm2.5 days
March21cm2.2 days
April11cm1.6 days

Average Snow and Weather Conditions in Mammoth Mountain during September (week 4):

The average snowfall forecast during week 4 of September for Mammoth Mountain is 2 cm. There are typically 0.4 snowy days during this week. Mammoth Mountain prevailing weather and snow conditions during the last week of September at the middle elevation of the ski area at 2896m, based on historical averages over the last 10 years: At this time of year the expected freezing level (4277m) is far above the mid altitude of Mammoth Mountain. A day with snowfall happens on average every other year during the last week of September but rainy days are even rarer and you can expect on average one rainy day every 5 years. In the years when snow falls at this time of year, forecast model average snowfall for the week is 4cm. Typical temperatures are well above freezing both day and night at the mid altitude in Mammoth Mountain during week four of September with the average afternoon temperature 10.2°C and the minimum temperature 6.8°C. Reliably sunny. On average, only one or two days each week are overcast and the rest have at least some sun. Generally light winds (average 10km/h).

Snow History: Compare Resorts

Compare Mammoth Mountain with:

Snow Depths

Recorded snow depths for the upper and lower slopes in Mammoth Mountain and (2007 – 2018).


Mammoth Mountain


Lower Slopes
Upper Slopes
Fresh Snow

Average Snow Conditions in

Best ski days per week in Mammoth Mountain and (2007 – 2018)


Bluebird Powder Day
(Fresh snow, mostly sunny, light wind)
Powder Day
(Fresh snow, limited sun, any wind)
Bluebird Day
(Average snow, mostly sunny, light wind)
Very windy days

The most cherished days on the mountain in Mammoth Mountain are Bluebird Powder days when it is mostly sunny with light winds following very recent snowfall. Poorer weather conditions may prevail on Powder days when the visibility can be limited but the snow is significantly deep and fresh for keen powder-hounds. Bluebird days can suit many skiers that aren’t necessarily hunting powder but want to enjoy the snowy mountains in sunnier conditions and light winds.

Average Snowfall in

Graph showing the average precipitation (snow/rain) in Mammoth Mountain and (2007 – 2018)


Snowfall amount
(bar chart)
Days with significant snowfall.
Days with significant rainfall.

The snowiest weeks of the year in Mammoth Mountain are shown but also bear in mind the number of days that it typically snows each week if you want regular fresh tracks. The risk of a rainy day is shown but be sure to switch between elevations to see if lower lifts are rain affected or higher lifts remain snowy despite any rain further down the mountain.

Average Temperature in

Graph showing the average temperature and freezing level at Mammoth Mountain and (2007 – 2018)


Average temperature
Above freezing
Below freezing
Freezing level
Dashed line

The highest and lowest temperatures averaged for each week of the year in Mammoth Mountain are shown. Check out the risk of freze-thaw conditions prevailing at different elevations for any given week. We also show the extremes of temperature (blue/red dots) that reveal the chance of unusually warm or cold conditions.