All Countries
Weather & Climate in Iwamizawa, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iwamizawa has a cool climate with an average annual temperature of 45°F (7°C). Winters average 20°F in January while summers reach 68°F in July. The area gets 252 sunny days per year, above the national average. Annual precipitation totals 46.2 inches (wetter than the 38-inch national average). The area receives 13.9 inches of snow annually. The city sits at an elevation of 56 feet.
Temperature
20°F Jan (-7°C)
68°F Jul (20°C)
| Annual Average | 45.1°F |
| 16% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 252 days/yr |
Geography
| Elevation | 56 ft (17 m) |
| Area | 185.7 sq mi (481.0 km²) |
| Population Density | 458/sq mi |
| Coordinates | 43.2003°N, 141.7597°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
766 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Feb 2, 2013 | 18 km SSW of Obihiro, Japan | M6.9 | 119 km | 107 km |
| Nov 26, 1991 | 33 km SSE of Shizunai-furukawach?, Japan | M6.4 | 142 km | 56 km |
| Jun 11, 2023 | 20 km WSW of Biratori, Japan | M6.2 | 76 km | 121 km |
| Oct 21, 2011 | 16 km NE of Asahikawa, Japan | M6.1 | 96 km | 187 km |
| Feb 19, 2003 | 26 km NNE of Rumoi, Japan | M5.9 | 106 km | 214 km |
| Aug 25, 2012 | 45 km ENE of Shizunai-furukawach?, Japan | M5.9 | 128 km | 55 km |
| Jun 12, 1991 | 17 km SE of Obihiro, Japan | M5.8 | 136 km | 109 km |
| Jun 10, 2004 | 49 km E of Shizunai-furukawach?, Japan | M5.8 | 133 km | 50 km |
| May 23, 1995 | Hokkaido, Japan region | M5.6 | 51 km | 17 km |
| Jun 24, 2011 | 35 km SSE of Shizunai-furukawach?, Japan | M5.5 | 144 km | 58 km |
| Apr 18, 2007 | 21 km E of Tomakomai, Japan | M5.5 | 61 km | 120 km |
| Sep 11, 1993 | 40 km SSE of Shizunai-furukawach?, Japan | M5.5 | 149 km | 58 km |
| Jul 8, 2014 | 13 km N of Shiraoi, Japan | M5.5 | 68 km | 10 km |
| Feb 28, 2009 | 37 km NW of Shizunai-furukawach?, Japan | M5.5 | 71 km | 105 km |
| Apr 27, 2019 | 39 km ENE of Shizunai-furukawach?, Japan | M5.4 | 120 km | 111 km |
| Feb 21, 2019 | 25 km ESE of Chitose, Japan | M5.4 | 51 km | 28 km |
| Jun 20, 2021 | 29 km NE of Shimo-furano, Japan | M5.3 | 80 km | 152 km |
| Jul 1, 2017 | 22 km E of Chitose, Japan | M5.3 | 45 km | 37 km |
| Sep 27, 2003 | 40 km ESE of Shizunai-furukawach?, Japan | M5.3 | 139 km | 33 km |
| Dec 22, 1997 | 17 km ENE of Otofuke, Japan | M5.3 | 132 km | 115 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 2.0 m (7 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1947 | W. HOKKAIDO ISLAND | Earthquake | 2.0 m | — | 91 km |
| 1982 | HOKKAIDO ISLAND | Earthquake | 1.3 m | 110 | 126 km |
| 1834 | W. HOKKAIDO ISLAND | Earthquake | — | — | 31 km |
| 1792 | W. HOKKAIDO ISLAND | Earthquake | — | — | 100 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
11 volcanoes within 200 km. Closest: Shikotsu (65 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 65 km |
| Tokachidake | Stratovolcano(es) | 2,077 m (6,814 ft) | 2004 | 79 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 88 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 93 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 97 km |
| Taisetsuzan | Stratovolcano(es) | 2,291 m (7,516 ft) | 1739 | 102 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 105 km |
| Maruyama | Stratovolcano(es) | 2,013 m (6,604 ft) | 1898 | 106 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 154 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 163 km |
| Akan | Caldera | 1,499 m (4,918 ft) | 2008 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 3.9 in | Coldest |
| February | 21°F (-6°C) | 3.0 in | |
| March | 29°F (-2°C) | 2.3 in | Driest |
| April | 42°F (6°C) | 2.5 in | |
| May | 53°F (12°C) | 2.7 in | |
| June | 61°F (16°C) | 2.9 in | |
| July | 68°F (20°C) | 3.9 in | |
| August | 70°F (21°C) | 5.9 in | Warmest, Wettest |
| September | 62°F (17°C) | 5.3 in | |
| October | 51°F (10°C) | 4.5 in | |
| November | 38°F (3°C) | 4.6 in | |
| December | 26°F (-3°C) | 4.7 in |
Iwamizawa has a seasonal temperature swing of 51°F / from 20°F in January to 70°F in August. Total annual precipitation is 46.2 inches, with August being the wettest month (5.9") and March the driest (2.3").