Mammoth Mountain Weather Forecast & Discusion

1-13-25 @ 8:30 AM WX Summary: Today, a quick-moving cold front will pass through the area, bringing cloudy skies during the morning hours, northeast winds, a few snowflakes, along with much cooler temperatures.

The NE winds will remain until midweek, with wind speeds backing off a bit each day into Wednesday. Temperatures will jump up into the 30s after highs in the 20s today.

This is a dry pattern, with no snowfall expected after this morning’s snowflakes that have been falling.

If you’re out on the hill today, temperatures at the first chair will be in the low to mid-20s, and midday temperatures will be in the mid to upper 20s from Main Lodge down to Canyon Lodge. Over the Upper Mountain, mid-day temperatures will be in the upper 10s to lower 20s.

Winds on the Lower Mountain will be NW to NE at 5 -10 mph. Over the Mid and Upper Mountain, the wind will be out of the Northeast at 20 to 25 mph, with gusts as high as 40-50 mph.

The skies will be clear on Tuesday. Temperatures at the first chair will be in the lower 20s, and midday temperatures will be in the mid to upper 30s from Main Lodge down to Canyon Lodge. Over the Upper Mountain, mid-day temperatures will be in the upper 20s to lower 30s.

Winds on the Lower Mountain will be NE 5 -10 mph. Over the Mid and Upper Mountain, the wind will be northeast at 20 to 25 mph, with gusts as high as 35-40 mph.

By Wednesday midday, temperatures will be in the upper 30s to lower 40s from Main Lodge down to Canyon Lodge. Over the Upper Mountain, temperatures will be in the low to mid-30s.

Winds on the Lower Mountain will be NE 5 -10 mph. The wind will be northeast over the Mid and Upper Mountain at 20 to 25 mph, with gusts as high as 35-40 mph.

As the ECMWF Ensemble model below shows, high pressure will be in control with blue skies overhead through next weekend, so plan accordingly.

Mountain Winds: As the gif below shows, there will be periods of gusty N to NE winds on Mammoth Mountain into Wednesday. These are cold upslope winds that blow in your face as you ski and ride down the hill. I would advise you to have face protection on upslope windy days. Expect a light wind flow from Thursday into Saturday.

Temperatures: The Upper Air Temperature Anomaly shows cooler air arriving in the Mammoth area at this time. Warming is expected midweek through Saturday before the next possible inside slider-type system brings in cooler air.

Long-Range Fantasy Outlook & Discussion: The 7-10-day forecast remains dry, with just above average temperatures expected on Mammoth Mountain and around the Eastern Sierra.

Day 7

Day 10

Beyond that, both ensembles have backed off on snowfall after the 21st of the month. It looks almost bone dry now as the switch to snowfall is being pushed back into early February.

Looking at the Ultra Fantasy Outlook model runs, here is what they show for February. The first image is the first 7 days of February, so the trend is for snowfall. Based on what we have seen so far this season, these lower-end totals could verify. A foot of snowfall over a week would refresh the surface conditions on the hill.

To note again, this is the Ultra Fantasy Outlook, and all we are really looking for is upcoming trends