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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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Koumi Riekkusu Ski Valley at 1780 m altitude
Issued by Snow-Forecast.com at: 8 am (local time) / 19 Dec 2025
Now
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  | |  |  | |  | | |  | | | |  | | | |
clear | some clouds | some clouds | light rain | some clouds | cloudy | rain shwrs | light rain | light snow | clear | some clouds | clear | clear | some clouds | some clouds | light snow | light snow | light snow | |
km/h | ||||||||||||||||||
Snow map |  |  |  |  |  |  | ||||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | |
— | — | — | 2 | — | — | 1 | 2 | 1 | — | — | — | — | — | — | — | 3 | — | |
max °C | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 5 | 3 | -3 | -3 | -3 | 0 | 1 | -1 | 0 | 2 | 1 |
min °C | 0 | 2 | 2 | 3 | 3 | 4 | 5 | 5 | -3 | -4 | -5 | -4 | -2 | -1 | -2 | 0 | 1 | -5 |
-3 | -1 | -2 | -1 | -1 | -1 | 1 | 1 | -10 | -10 | -10 | -7 | -4 | -5 | -6 | -6 | -5 | -12 | |
51 | 40 | 56 | 93 | 87 | 85 | 93 | 94 | 91 | 72 | 56 | 64 | 51 | 40 | 77 | 91 | 96 | 85 | |
1700 | 2550 | 2350 | 2300 | 2450 | 2800 | 2700 | 2850 | 1700 | 1000 | 1250 | 950 | 1400 | 2050 | 1300 | 1550 | 2200 | 1700 | |
 | 6:50 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — |
 | — | 4:34 | — | — | 4:34 | — | — | 4:35 | — | — | 4:35 | — | — | 4:36 | — | — | 4:36 | — |
Next 0-3 days weather summary:
Light rain (total 6.0mm), mostly falling on Sat morning. Freeze-thaw conditions (max 5°C on Sat night, min -3°C on Sun night). Wind will be generally light.
Next 4-6 days weather summary:
A dusting of snow turning to light rain (total 3.0mm) on Wed afternoon. Freeze-thaw conditions (max 2°C on Wed afternoon, min -5°C on Mon afternoon). Wind will be generally light.
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Latest snow reports near Koumi Riekkusu Ski Valley:
Koumi Riekkusu Ski Valley Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | — |
| Last snowfall: | 17 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in Japan - Nagano are reporting: powder (3) / good piste (3)
Snow History
Week 3 of December has on average:
0.7 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
0.5 | Powder days Fresh snow, limited sun, any wind. |
3.4 | Bluebird days Average snow, mostly sunny, light wind. |
Koumi Riekkusu Ski Valley Forecast Snowfall
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Other resorts in Japan - Nagano are reporting: powder (3) / good piste (3)
The above table gives the weather forecast for Koumi Riekkusu Ski Valley at the specific elevation of 1780 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Koumi Riekkusu Ski 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 Japan.
Click here to read further information on freezing levels and how we forecast our temperatures.
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