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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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Castleside at 634 m altitude
Issued by Snow-Forecast.com at: 11 pm (local time) / 18 Dec 2025
Now
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | |  | | |  |  |  |  |  | | | | |  | |
rain shwrs | some clouds | some clouds | clear | some clouds | some clouds | cloudy | cloudy | light rain | mod. rain | mod. rain | mod. rain | mod. rain | light rain | light rain | light rain | |
km/h | ||||||||||||||||
Snow map |  |  |  |  |  |  | ||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
2 | — | — | — | — | — | — | — | 4 | 10 | 6 | 6 | 6 | 2 | 2 | 3 | |
max °C | 5 | 4 | 3 | 3 | 3 | 3 | 2 | 3 | 5 | 4 | 5 | 4 | 4 | 3 | 3 | 3 |
min °C | 3 | 4 | 3 | 2 | 1 | 3 | 2 | 2 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 2 |
-4 | -3 | -4 | -3 | -4 | -3 | -4 | -3 | -1 | 0 | 1 | 1 | 0 | -2 | -3 | -4 | |
62 | 74 | 80 | 78 | 79 | 74 | 93 | 98 | 97 | 99 | 99 | 98 | 97 | 95 | 94 | 95 | |
1100 | 1250 | 1100 | 1150 | 1400 | 1300 | 1100 | 1200 | 1400 | 1450 | 1500 | 1300 | 1350 | 1100 | 1050 | 1050 | |
 | — | 8:27 | — | — | 8:27 | — | — | 8:29 | — | — | 8:29 | — | — | 8:30 | — | — |
 | — | — | 3:40 | — | — | 3:41 | — | — | 3:41 | — | — | 3:41 | — | — | 3:41 | — |
Next 0-3 days weather summary:
Light rain (total 6.0mm), mostly falling on Sun afternoon. Mild temperatures (max 5°C on Thu night, min 1°C on Sat morning). Winds decreasing (near gales from the WSW on Thu night, moderate winds from the SW by Fri night).
Next 4-6 days weather summary:
Heavy rain (total 35.0mm), heaviest during Sun night. Mild temperatures (max 5°C on Mon morning, min 1°C on Wed morning). Winds increasing (light winds from the ESE on Mon afternoon, fresh winds from the E by Tue night).
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Snow Radar
Latest snow reports near Castleside:
Castleside Snow Conditions
| Top snow depth: | — |
|---|---|
| Bottom snow depth: | — |
| Fresh snowfall depth: | — |
| Last snowfall: | 5 Dec 2025 |
| Snow Alerts | Create Alert |
Other resorts in United Kingdom are reporting: powder (0) / good piste (0)
Snow History
Week 3 of December has on average:
0.1 | Bluebird Powder days Fresh snow, mostly sunny, light wind. |
|---|---|
0.5 | Powder days Fresh snow, limited sun, any wind. |
0.3 | Bluebird days Average snow, mostly sunny, light wind. |
Castleside Forecast Snowfall
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Other resorts in United Kingdom are reporting: powder (0) / good piste (0)
The above table gives the weather forecast for Castleside at the specific elevation of 634 m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom ski stations of Castleside. 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 Kingdom.
Click here to read further information on freezing levels and how we forecast our temperatures.
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