Sorachi region | JMA weather station "Iwamizawa"
When does it snow in Iwamizawa? Snow depth and snowfall normals
The station is at an elevation of 42 m. All figures are normals from the Japan Meteorological Agency (JMA): 30-year averages for 1991–2020.
Snow in Iwamizawa now
- Snow depth now
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- Snowfall, past 24 hours
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- Normal depth for today
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The snow falling in this box matches the past 24 hours of snowfall (it may not be snowing right now). Snow depth now at 41 places →
- Annual snowfall
- 664cm10th of 41 places
- Deepest snow
- 120cmFebruary max normal: 118cm
- Snowiest month
- December200cm in the month
- Ice days (year)
- 62.5 daysDays with a high below 0℃
When the snow starts and ends in Iwamizawa
| First snow of the season | Oct 30 |
|---|---|
| First day with 1 cm+ snow cover | Nov 10 |
| Lasting snow cover begins | Dec 1 |
| Deepest day (daily normals) | Feb 17（97cm） |
| Lasting snow cover ends | Apr 6 |
| Last day with 1 cm+ snow cover | Apr 11 |
| Last snow of the season | Apr 21 |
JMA normals for the first and last snow, the first and last snow cover, and lasting snow cover (snow on the ground for 30 days or more in a row). First/last snow dates and days with snowfall were recalculated by JMA in 2024, when snow observation switched from human observers to instruments.
Snow depth in Iwamizawa (October to May)
Daily snow depth normals. Tap a month for details.
- OctoberSnowfall 1cmMax depth 1cmMean 10.8℃
- NovemberSnowfall 70cmMax depth 29cmMean 3.9℃
- DecemberSnowfall 200cmMax depth 74cmMean -2.6℃
- JanuarySnowfall 187cmMax depth 101cmMean -5.3℃
- FebruarySnowfall 137cmMax depth 118cmMean -4.6℃
- MarchSnowfall 72cmMax depth 99cmMean -0.4℃
- AprilSnowfall 8cmMax depth 32cmMean 6.1℃
- MaySnowfall 0cmMax depth 0cmMean 12.1℃
Monthly snowfall in Iwamizawa
Monthly snow and temperature normals in Iwamizawa
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snowfall (monthly total) | 187cm | 137cm | 72cm | 8cm | 0cm | 0cm | 0cm | 0cm | 0cm | 1cm | 70cm | 200cm | 664cm |
| Max snow depth | 101cm | 118cm | 99cm | 32cm | 0cm | 0cm | 0cm | 0cm | 0cm | 1cm | 29cm | 74cm | 120cm |
| Days with 10 cm+ snow cover | 30.9 days | 28.3 days | 29.2 days | 5.8 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 6.0 days | 25.1 days | 124.6 days |
| Days with snowfall | 29.1 days | 25.3 days | 21.9 days | 7.9 days | 0.3 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 2.1 days | 14.9 days | 27.9 days | ― |
| Mean temperature | -5.3℃ | -4.6℃ | -0.4℃ | 6.1℃ | 12.1℃ | 16.3℃ | 20.2℃ | 21.3℃ | 17.4℃ | 10.8℃ | 3.9℃ | -2.6℃ | 7.9℃ |
| Mean daily high | -1.9℃ | -0.9℃ | 3.5℃ | 11.2℃ | 17.7℃ | 21.7℃ | 25.1℃ | 26.1℃ | 22.4℃ | 15.7℃ | 7.6℃ | 0.5℃ | 12.4℃ |
| Mean daily low | -9.2℃ | -8.9℃ | -4.5℃ | 1.3℃ | 7.1℃ | 12.0℃ | 16.6℃ | 17.6℃ | 12.9℃ | 6.2℃ | 0.2℃ | -6.0℃ | 3.8℃ |
| Ice days (high below 0℃) | 22.6 days | 17.2 days | 5.5 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 0.0 days | 1.6 days | 15.5 days | 62.5 days |
| Precipitation | 119.4mm | 85.5mm | 59.4mm | 52.7mm | 83.9mm | 69.5mm | 111.5mm | 161.1mm | 142.2mm | 110.4mm | 118.8mm | 144.5mm | 1248.5mm |
June to September link to the Hokkaido-wide summer pages. "Year" for max snow depth is the normal for the whole winter.
Temperature in Iwamizawa (12 months)
HighMeanLow
Location and nearby places
- Bibaiabout 17 km · 766cm of snow a year
- Ishikariabout 34 km · 644cm of snow a year
- Eniwa (Shimamatsu)about 36 km · 534cm of snow a year
- Sapporoabout 41 km · 479cm of snow a year
Sources
- Japan Meteorological Agency (JMA), Climatological Normals 1991–2020 (in Japanese); Normals for Iwamizawa (JMA, in Japanese)
- JMA, Recalculated normals for snow days and first/last snow dates, 2024 (PDF, in Japanese)
- Station locations: JMA, List of AMeDAS stations (in Japanese)
- Current snow and 24-hour snowfall: JMA AMeDAS
- Map: National Land Numerical Information, Administrative Boundaries (MLIT) (processed)