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Gassan Glacier resort snow
Lat Long: 38.52° N 140.01° E
Ski Japan

Gassan Glacier Snow History

Weather Forecast for Gassan Glacier at 1742m altitude

Issued: 2 pm 21 Apr 2026 (local time)

Forecast update in  hr  min

Next snow in Gassan Glacier: 2.0cm on Wed 29th  (after 9 AM)

Is Gassan Glacier snowsure?

The snowiest week in Gassan Glacier is week 3 of December. There are typically 6.0 snowy days during this week with 150cm of snowfall. Check out the Gassan Glacier 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 Gassan Glacier

MonthSnow amount (week)Snow days (week)
December133cm5.9 days
January136cm6.4 days
February106cm6.0 days
March60cm4.7 days
April21cm2.6 days

Average Snow and Weather Conditions in Gassan Glacier during April (week 3):

The average snowfall forecast during week 3 of April for Gassan Glacier is 18 cm. There are typically 2.6 snowy days during this week.Gassan Glacier typical weather and snow conditions during the third week of April at the middle elevation of the ski area at 1742m, based on historical averages over the last 14 years: At this time of year the typical freezing level (1956m) is close to the middle elevation of Gassan Glacier. On average, expect two or three days with snowfall per week in Gassan Glacier in the middle of April but with a long-term average of one wet day during this week every year. Forecast model average snowfall for the week is 18cm. Temperatures averaging above freezing both day and night in Gassan Glacier during week three of April with average maximum temperature 1.6°C and minimum temperature 0.1°C at the middle elevation. Expect the sun to come out on two or three days per week. Often windy. (average 34km/h) with the mean wind greater than 30km/h three days per week, perhaps strong enough to affect lift operations. Below-freezing, calm and sunny ideal weather days that follow fresh snowfall (bluebird powder days) happen on average one day every second year during this week but clear, calm and cold days that do not have new snow happen on average one day during this week in any given year.


Snow History: Compare Resorts


Compare Gassan Glacier with:

Snow Depths

Recorded snow depths for the upper and lower slopes in Gassan Glacier and (2007 – 2024).

Winter
Summer

Gassan Glacier


Lower Slopes
Upper Slopes
Fresh Snow

Average Snow Conditions in

Best ski days per week in Gassan Glacier and (2007 – 2024)

Winter
Summer

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
(>30km/h)

The most cherished days on the mountain in Gassan Glacier 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 Gassan Glacier and (2007 – 2024)

Winter
Summer

Snowfall amount
(bar chart)
Days with significant snowfall.
(>5cm)
Days with significant rainfall.
(>5mm)

The snowiest weeks of the year in Gassan Glacier 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 Gassan Glacier and (2007 – 2024)

Winter
Summer

Average temperature
Maximum
Minimum
Temperatures
Above freezing
Below freezing
Freezing level
Dashed line

The highest and lowest temperatures averaged for each week of the year in Gassan Glacier 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.