Mammoth Mountain Weather Forecast & Discussion

December 14th – @ 8 AM Mammoth Weather 5-Day Forecast: A ridge of high pressure will continue to be the main player in Mammoth Weather into Saturday. The next 3 days on the hill should be very nice with warm mid-day temperatures and lighter winds.

The ridge starts to get pushed out of the area on Sunday as the next cut-off low starts affecting the weather in the area. On Sunday you can expect to see increasing clouds and winds.

By Sunday evening the COL is forecast to push in some high-elevation snow showers in the 8000-9000 elevation range. As the cut-off low gets closer snow levels look to be in the 7500 to 8000 foot range on Monday.

As this is a cut-off low the track will waver a bit over the next few days making the snowfall forecast a low-confidence one. The ECMWF has 1-4 inches while the GFS has 10-16 inches of snowfall.

Right now Snowman is going with the drier forecast ECMWF, as patterns tend to repeat themselves. Hopefully, the wetter solution is what we see on all the models over the weekend.

As for Snowmaking Operations, the system will be able to run nightly during the night and into the morning hours right through the weekend.

Thursday into Saturday Forecast Details: At the Main Lodge, expect mostly clear skies with just a few high clouds at times.

Mid-day temperatures will be in the low to mid-40s, with early morning lows in the upper 20s to lower 30s. SW winds will be 5-10 MPH with gusts over the higher elevation to 15 MPH at times.

Down in Mammoth Lakes mid-day temperatures will be in the upper 40s to lower 50s with night times lows in the mid to upper 20s. For Bishop mid-day temperatures will be in the upper 50s to low 60s into Sunday with lows at night in the upper 20s to lower 30s.

NWS Mammoth Mountain Forecast
NWS Mammoth Mountain Forecast


Satellite for Mammoth Mountain Forecast
Satellite View
Snowfall Forecast from the ECMWF into next Wednesday Morning
Snowfall Forecast from the ECMWF into next Wednesday Morning
Snowfall Forecast from the GFS into next Wednesday Morning
Snowfall Forecast from the GFS into next Wednesday Morning

Mammoth Mountain Long Range Outlook

** Weather Disclaimer: The Fantasy Outlooks are “Outlooks, Not Forecasts.” Some years, the wet patterns that appear in these longer range outlooks pan out; other times, the changes are always out in the fantasy period and never make it to the short-term forecast period. When all the ensemble models have agreement on wet or dry patterns, more often than not, they do seem to pan out more often then not.

December 14 – Yahoo, A change in the weather pattern is finally taking place. Confidence is moderate in changing to a wetter pattern the last couple of weeks of December.

As of this post, this pattern does not look like a major storm cycle that will shut everything down for days at a time. If that changes I will let you know ASAP.


ECMWF – Seasonal Mean Precipitation Outlook – 12-7-2023 

This Model Updates Every 30 Days

ENSO – El Nino / La Nina Outlook – November 12th, 2023

El Niño Update: The current El Nino is in the strong category. How the event affects Mammoth Mountain and the Eastern Sierra this winter is uncertain. There are a lot of variables with this particular El Nino event that have not been seen during other strong events. Take a look at the video below for more information.

There are not a lot of strong El Ninos to look back at, so it’s hard to trust any of the long-range data right now. Past El Niño winters have been slow to start, so don’t be surprised if the Eastern Sierra sees below-average rain and snowfall this Fall. 

The video below is new from Mike Discussing the most current El Nino Data. All the images in this section have been updated, with what’s the most recent as of 11-12-23.

>>>> 9-29-23 – To note, El Niño winters can be slow to start, so don’t be surprised if the Eastern Sierra sees below-average rain and snowfall this Fall.

Current Weather and Information Posts

Author – Steve Taylor – The Mammoth Snowman Over the last 30+ years, Snowman has spent countless hours studying and learning about Mammoth Mountain Weather and Snow Conditions first hand. He has been skiing around the hill with marked ski poles since March of 1991 so he can measure the fresh snowfall amounts out on the hill. 

Snowman started blogging this information back in 1990 on the old Mammoth BBS system, then the RSN Forums and then on to in 2004 with Video & Photo Blog reports. (No YouTube back then). Facebook got added to the fold back in 2008 and then the Facebook Group in 2016. 

Reports, videos, and photos from the website have been featured on both local TV Stations here in Mammoth and Bishop, along with KTLA, AP, Fox, ABC, CBS, and NBC News.

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