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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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Shiga Kogen-Ichinose Diamond at 1708 m altitude
Issued by Snow-Forecast.com at: 2 pm (local time) / 18 Dec 2025
Now
Thu 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  | |  | |  |  |  | | | | | | | |
snow shwrs | clear | clear | clear | some clouds | clear | some clouds | some clouds | cloudy | light rain | light snow | snow shwrs | snow shwrs | clear | clear | some clouds | some clouds | |
km/h | |||||||||||||||||
Snow map |  |  |  |  |  |  | |||||||||||
— | — | — | — | — | — | — | — | — | — | 4 | 1 | — | — | — | — | — | |
— | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | |
max °C | -5 | 0 | 2 | 4 | 5 | 5 | 6 | 6 | 6 | 5 | -1 | -6 | -7 | -2 | 1 | 1 | 1 |
min °C | -6 | -3 | 1 | 2 | 4 | 4 | 6 | 5 | 6 | 3 | -5 | -7 | -7 | -5 | -1 | 1 | 0 |
-11 | -6 | -2 | -1 | 1 | 0 | 3 | 2 | 3 | 0 | -12 | -14 | -13 | -8 | -3 | -2 | -4 | |
79 | 38 | 37 | 48 | 30 | 75 | 72 | 76 | 85 | 95 | 98 | 81 | 81 | 37 | 33 | 49 | 50 | |
750 | 750 | 1900 | 2350 | 2550 | 2600 | 2700 | 2900 | 2950 | 2650 | 1150 | 600 | 600 | 400 | 1550 | 1850 | 1600 | |
 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — |
 | 4:30 | — | — | 4:31 | — | — | 4:31 | — | — | 4:32 | — | — | 4:32 | — | — | 4:34 | — |
Next 0-3 days weather summary:
Mostly dry. Freeze-thaw conditions (max 6°C on Sat afternoon, min -6°C on Thu afternoon). Wind will be generally light.
Next 4-6 days weather summary:
Mild with light rain (total 3.0mm) on Sun afternoon Becoming colder with a light covering of snow, mostly falling on Sun night. Freeze-thaw conditions (max 5°C on Sun afternoon, min -7°C on Mon morning). Wind will be generally light.
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Latest snow reports near Shiga Kogen-Ichinose Diamond:
33 km away from Shiga Kogen-Ichinose Diamond
7 hours ago
Rain and snow or hail reported from Nagano at 120 metres elevation 8 kms SE of Iizuna Kogen Ski Resort from Iizuna Kogen
49 km away from Shiga Kogen-Ichinose Diamond
7 hours agoRain and snow or hail reported from Takada at 18 metres elevation only 2 kms E of Kanayasan Ski Resort from Kanayasan
33 km away from Shiga Kogen-Ichinose Diamond
9 hours agoModerate to heavy freezing rain reported from Nagano at 120 metres elevation 8 kms SE of Iizuna Kogen but it is forecast cold enough for snow at the ski area from Iizuna Kogen
Shiga Kogen-Ichinose Diamond Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | 4 cm |
| 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:
2.6 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
2.2 | Powder days Fresh snow, limited sun, any wind. |
0.6 | Bluebird days Average snow, mostly sunny, light wind. |
Shiga Kogen-Ichinose Diamond 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 Shiga Kogen-Ichinose Diamond at the specific elevation of 1708 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Shiga Kogen-Ichinose Diamond. 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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