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Weather & Climate in Oshima-shiriuchi, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Oshima-shiriuchi experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 26°F in January while summers reach 66°F in July. The area gets 245 sunny days per year, above the national average. Annual precipitation totals 50.1 inches (wetter than the 38-inch national average). The area receives 13.3 inches of snow annually. The city sits at an elevation of 10 feet.
Temperature
26°F Jan (-3°C)
66°F Jul (19°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 245 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 76.0 sq mi (196.8 km²) |
| Population Density | 55/sq mi |
| Coordinates | 41.6010°N, 140.4227°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
660 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.5.
| Aug 7, 1993 | 69 km WNW of Kamiiso, Japan | M6.5 | 65 km | 14 km |
| Jul 12, 1992 | 70 km ENE of Mutsu, Japan | M6.2 | 135 km | 64 km |
| Aug 24, 1992 | 9 km NNW of Honch?, Japan | M6.2 | 46 km | 121 km |
| Jun 8, 2015 | 74 km ENE of Mutsu, Japan | M6.1 | 134 km | 42 km |
| May 5, 2023 | 68 km ENE of Mutsu, Japan | M5.9 | 130 km | 59 km |
| May 23, 2012 | 72 km E of Mutsu, Japan | M5.9 | 141 km | 46 km |
| Apr 29, 2008 | 70 km ENE of Mutsu, Japan | M5.8 | 135 km | 47 km |
| Jan 30, 1998 | 70 km ENE of Mutsu, Japan | M5.8 | 134 km | 33 km |
| Mar 11, 2011 | 18 km E of Misawa, Japan | M5.8 | 143 km | 45 km |
| Sep 13, 2010 | 68 km ENE of Mutsu, Japan | M5.8 | 131 km | 45 km |
| Mar 7, 2017 | 62 km ENE of Mutsu, Japan | M5.7 | 124 km | 56 km |
| Jun 4, 2008 | 135 km WSW of Kamiiso, Japan | M5.7 | 114 km | 205 km |
| Jul 26, 1999 | 26 km ENE of Misawa, Japan | M5.7 | 139 km | 104 km |
| Apr 3, 2002 | 60 km ENE of Mutsu, Japan | M5.7 | 119 km | 71 km |
| Jul 12, 1993 | 125 km WNW of Kamiiso, Japan | M5.6 | 117 km | 33 km |
| Jul 8, 2014 | 13 km N of Shiraoi, Japan | M5.5 | 141 km | 10 km |
| May 18, 2007 | 73 km ENE of Mutsu, Japan | M5.5 | 130 km | 58 km |
| Feb 14, 2002 | 70 km ENE of Mutsu, Japan | M5.5 | 135 km | 61 km |
| Nov 15, 2013 | 81 km E of Mutsu, Japan | M5.5 | 147 km | 46 km |
| Oct 9, 1997 | 149 km W of Kamiiso, Japan | M5.5 | 136 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2002 | Higos | Category 1 | 69 mph | 147 km |
| 1998 | Vicki | Category 1 | 58 mph | 190 km |
| 1995 | Ryan | Category 1 | 40 mph | 280 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
7 tsunamis recorded within 500 km. Highest wave on record: 90.0 m (295 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1741 | W. HOKKAIDO ISLAND | Explosion | 90.0 m | 2,000 | 88 km |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 56 km |
| 1793 | W. OFF AOMORI | Earthquake | 1.8 m | 12 | 92 km |
| 1983 | N. HONSHU ISLAND | Earthquake | 1.0 m | — | 114 km |
| 1993 | JAPAN | Earthquake | 0.2 m | — | 65 km |
| 1766 | SANRIKU | Earthquake | — | 1,700 | 81 km |
| 1341 | JUSANKO, TSUGARU AOMORI PREFECTURE | Earthquake | — | 2,600 | 102 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Hokkaido-Komagatake (56 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 56 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 66 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 68 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 88 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 106 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 110 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 111 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 116 km |
| Towada | Caldera | 1,011 m (3,317 ft) | 915 | 127 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 140 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 143 km |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 144 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 184 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 186 km |
| Megata | Maar(s) | 291 m (955 ft) | -2050 | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 3.6 in | Coldest |
| February | 28°F (-2°C) | 3.0 in | Driest |
| March | 33°F (1°C) | 3.0 in | |
| April | 44°F (7°C) | 3.2 in | |
| May | 53°F (11°C) | 3.5 in | |
| June | 59°F (15°C) | 3.8 in | |
| July | 66°F (19°C) | 5.5 in | |
| August | 70°F (21°C) | 5.9 in | Warmest |
| September | 65°F (18°C) | 6.5 in | Wettest |
| October | 54°F (12°C) | 4.3 in | |
| November | 42°F (6°C) | 4.1 in | |
| December | 32°F (-0°C) | 3.7 in |
Oshima-shiriuchi has a seasonal temperature swing of 44°F / from 26°F in January to 70°F in August. Total annual precipitation is 50.1 inches, with September being the wettest month (6.5") and February the driest (3.0").