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Japan Weekly Snow Roundup #293
Weekly Snow News for Japan, updated 17 December 2025: Siberian cold fuels relentless powder storms, with Hokkaido leading Japan’s mid-winter surge.
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Sun Valley at 2262 m altitude
Issued by Snow-Forecast.com at: 10 am (local time) / 17 Dec 2025
Now
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  | |  | | | |  |  |  | | | | | |  | |
snow shwrs | snow shwrs | some clouds | light snow | light snow | mod. snow | light snow | light snow | snow shwrs | some clouds | cloudy | light snow | light snow | snow shwrs | light snow | light snow | light snow | cloudy | |
km/h | ||||||||||||||||||
Snow map |  |  |  |  |  |  | ||||||||||||
4 | — | — | — | 4 | 8 | 4 | 4 | 2 | — | — | 4 | 4 | 1 | 3 | 2 | — | — | |
13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
max °C | 4 | -5 | -6 | -5 | -2 | 1 | -1 | 1 | -2 | -6 | -4 | -2 | -1 | -1 | -2 | -3 | -4 | -3 |
min °C | -2 | -8 | -9 | -5 | -3 | -1 | -1 | -1 | -9 | -9 | -5 | -5 | -2 | -3 | -4 | -4 | -6 | -5 |
-12 | -16 | -17 | -9 | -8 | -7 | -7 | -8 | -16 | -15 | -9 | -9 | -8 | -7 | -9 | -11 | -12 | -10 | |
68 | 82 | 52 | 88 | 97 | 96 | 98 | 97 | 52 | 44 | 51 | 97 | 98 | 88 | 98 | 88 | 82 | 69 | |
2000 | 1000 | 850 | 1400 | 1700 | 2250 | 2150 | 2350 | 400 | 1150 | 1050 | 1800 | 2050 | 1650 | 1950 | 1750 | 1000 | 1400 | |
 | 8:04 | — | — | 8:04 | — | — | 8:06 | — | — | 8:06 | — | — | 8:07 | — | — | 8:07 | — | — |
 | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:01 | — | — | 5:02 | — |
Next 0-3 days weather summary:
Moderate rain (total 13.0mm) on Wed morning. Becoming colder with heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 4°C on Wed morning, min -9°C on Wed night). Winds decreasing (gales from the W on Wed morning, light winds from the WNW by Wed night).
Next 4-6 days weather summary:
A moderate fall of snow, heaviest on Sat night. Temperatures will be below freezing (max -1°C on Sun morning, min -9°C on Sat morning). Winds increasing (light winds from the W on Sat afternoon, fresh winds from the WSW by Mon morning).
Popular Sun Valley Pages
Snow Radar
Latest snow reports near Sun Valley:
Sun Valley Snow Conditions
| Top snow depth: | 94 cm |
|---|---|
| Bottom snow depth: | 91 cm |
| Fresh snowfall depth: | 10 cm |
| Last snowfall: | 16 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in USA - Idaho are reporting: powder (0) / good piste (0)
Snow History
Week 3 of December has on average:
0.8 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
1.2 | Powder days Fresh snow, limited sun, any wind. |
2.0 | Bluebird days Average snow, mostly sunny, light wind. |
Sun Valley Forecast Snowfall
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Photos of Sun Valley
Sawtooth Range by Tom
the bowls by David Boock
Sun Valley by Tom
Upload new photo Other resorts in USA - Idaho are reporting: powder (0) / good piste (0)
The above table gives the weather forecast for Sun Valley at the specific elevation of 2262 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Sun Valley. To access the weather forecasts for the other elevations, use the tab navigation above the table. For a wider view of the weather, check out the Weather Map of United States.
Click here to read further information on freezing levels and how we forecast our temperatures.
Visitor Reviews of Sun Valley
Overall 4.5 Based on 9 votes and 9 reviews
- Snowsure
- Variety of pistes
- Vote
- Bruce Rehberger from United States writes:
Sun Valley is not a good place for beginners unless they stay on Dollar Mountain which has only a 650 foot vertical drop. On Bald Mountain, most of the green runs are actually intermediate blue runs. Some of the catwalks are scary because of hairpin turns on speedy downhill paths. The Warm Springs area should be avoided in the morning due to lack of sunlight and the resulting flat lighting. The food is pricey, hot dog is $15, small bowl of soup is $13. I think you get the idea. Last but not least, the resort needs to turn on the snow guns more often. In a week's time I did not see any evidence of manmade snow. The grooming tractor operators must have been on strike the week I was there. The slow zones are not monitored by the ski patrol folks. As a result too many skiers just went as fast as they wanted to, which was disappointing.
Visitor Reviews of Sun Valley
Bruce Rehberger from United States writes:
Sun Valley is not a good place for beginners unless they stay on Dollar Mountain which has only a 650 foot vertical drop. On Bald Mountain, most of the green runs are actually intermediate blue runs. Some of the catwalks are scary because of hairpin turns on speedy downhill paths. The Warm Springs area should be avoided in the morning due to lack of sunlight and the resulting flat lighting. The food is pricey, hot dog is $15, small bowl of soup is $13. I think you get the idea. Last but not least, the resort needs to turn on the snow guns more often. In a week's time I did not see any evidence of manmade snow. The grooming tractor operators must have been on strike the week I was there. The slow zones are not monitored by the ski patrol folks. As a result too many skiers just went as fast as they wanted to, which was disappointing.
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