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Weather & Climate in Ōma, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ōma experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 31°F in January while summers reach 66°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 49.5 inches (wetter than the 38-inch national average). The area receives 12.8 inches of snow annually. The city sits at an elevation of 33 feet.
Temperature
31°F Jan (-1°C)
66°F Jul (19°C)
| Annual Average | 49.1°F |
| 9% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 129.3 sq mi (334.9 km²) |
| Population Density | 40/sq mi |
| Coordinates | 41.5273°N, 140.9109°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
971 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 | 102 km | 14 km |
| Aug 13, 2001 | 87 km ENE of Misawa, Japan | M6.4 | 128 km | 38 km |
| Nov 26, 1991 | 33 km SSE of Shizunai-furukawach?, Japan | M6.4 | 146 km | 56 km |
| Jan 24, 2018 | 99 km ENE of Misawa, Japan | M6.3 | 136 km | 31 km |
| Jul 12, 1992 | 70 km ENE of Mutsu, Japan | M6.2 | 94 km | 64 km |
| Jun 11, 2023 | 20 km WSW of Biratori, Japan | M6.2 | 138 km | 121 km |
| Aug 24, 1992 | 9 km NNW of Honch?, Japan | M6.2 | 54 km | 121 km |
| Jun 8, 2015 | 74 km ENE of Mutsu, Japan | M6.1 | 93 km | 42 km |
| Oct 14, 2002 | 87 km E of Mutsu, Japan | M6.1 | 118 km | 61 km |
| Aug 10, 2014 | 78 km E of Mutsu, Japan | M6.1 | 110 km | 41 km |
| May 23, 2012 | 72 km E of Mutsu, Japan | M5.9 | 100 km | 46 km |
| May 5, 2023 | 68 km ENE of Mutsu, Japan | M5.9 | 89 km | 59 km |
| Apr 29, 2008 | 70 km ENE of Mutsu, Japan | M5.8 | 94 km | 47 km |
| Jan 30, 1998 | 70 km ENE of Mutsu, Japan | M5.8 | 93 km | 33 km |
| Sep 13, 2010 | 68 km ENE of Mutsu, Japan | M5.8 | 90 km | 45 km |
| Mar 11, 2011 | 18 km E of Misawa, Japan | M5.8 | 112 km | 45 km |
| Feb 6, 1995 | 80 km E of Mutsu, Japan | M5.7 | 112 km | 61 km |
| Apr 3, 2002 | 60 km ENE of Mutsu, Japan | M5.7 | 78 km | 71 km |
| Mar 7, 2017 | 62 km ENE of Mutsu, Japan | M5.7 | 83 km | 56 km |
| Jul 26, 1999 | 26 km ENE of Misawa, Japan | M5.7 | 105 km | 104 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
2 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 | 121 km |
| 1998 | Vicki | Category 1 | 58 mph | 166 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
15 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 | 128 km |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 63 km |
| 1763 | SANRIKU | Earthquake | 5.0 m | - | 122 km |
| 1793 | W. OFF AOMORI | Earthquake | 1.8 m | 12 | 110 km |
| 1982 | HOKKAIDO ISLAND | Earthquake | 1.3 m | 110 | 139 km |
| 2025 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.7 m | - | 120 km |
| 1968 | OFF COAST OF HONSHU ISLAND | Earthquake | 0.6 m | - | 149 km |
| 1912 | SANRIKU | Earthquake | 0.5 m | - | 146 km |
| 1945 | SANRIKU | Earthquake | 0.4 m | 2 | 122 km |
| 1931 | SANRIKU | Earthquake | 0.4 m | - | 138 km |
| 1993 | JAPAN | Earthquake | 0.2 m | - | 102 km |
| 1766 | SANRIKU | Earthquake | - | 1,700 | 72 km |
| 1763 | SANRIKU, HACHIONHE | Earthquake | - | - | 130 km |
| 1763 | N. SANRIKU | Earthquake | - | - | 145 km |
| 1341 | JUSANKO, TSUGARU AOMORI PREFECTURE | Earthquake | - | 2,600 | 132 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Osorezan (33 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 33 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 38 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 63 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 97 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 109 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 110 km |
| Towada | Caldera | 1,011 m (3,317 ft) | 915 | 113 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 113 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 129 km |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 135 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 145 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 151 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 174 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 175 km |
| Iwatesan | Complex | 2,038 m (6,686 ft) | 1919 | 186 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 3.5 in | Coldest |
| February | 31°F (-1°C) | 2.9 in | |
| March | 35°F (2°C) | 2.8 in | Driest |
| April | 45°F (7°C) | 3.2 in | |
| May | 53°F (12°C) | 3.4 in | |
| June | 59°F (15°C) | 3.9 in | |
| July | 66°F (19°C) | 5.1 in | |
| August | 71°F (22°C) | 5.9 in | Warmest |
| September | 65°F (19°C) | 6.6 in | Wettest |
| October | 55°F (13°C) | 4.2 in | |
| November | 44°F (7°C) | 4.5 in | |
| December | 35°F (2°C) | 3.7 in |
Ōma has a seasonal temperature swing of 41°F / from 31°F in January to 71°F in August. Total annual precipitation is 49.4 inches, with September being the wettest month (6.6") and March the driest (2.8").