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Weather & Climate in Ōmamachō-ōmama, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ōmamachō-ōmama enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 37°F in January while summers reach 75°F in July. The area gets 241 sunny days per year, above the national average. Annual precipitation totals 52.6 inches (wetter than the 38-inch national average). The city sits at an elevation of 597 feet.
Temperature
37°F Jan (3°C)
75°F Jul (24°C)
| Annual Average | 56.2°F |
| 4% above US avg | |
| January Average | 37°F (3°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 241 days/yr |
Geography
| Elevation | 597 ft (182 m) |
| Area | 166.8 sq mi (431.9 km²) |
| Population Density | 128/sq mi |
| Coordinates | 36.4318°N, 139.2753°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,731 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.6.
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 119 km | 11 km |
| Jul 16, 2007 | 20 km NNW of Kashiwazaki, Japan | M6.6 | 143 km | 12 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 139 km | 67 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 103 km | 9 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 145 km | 62 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 133 km | 43 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 143 km | 9 km |
| Jul 23, 2005 | 9 km WSW of Ichihara, Japan | M5.9 | 122 km | 61 km |
| Apr 10, 2005 | near the east coast of Honshu, Japan | M5.9 | 137 km | 43 km |
| Apr 12, 2011 | 8 km WSW of Ishikawa, Japan | M5.9 | 123 km | 11 km |
| Apr 29, 2012 | 5 km NNW of T?gane, Japan | M5.8 | 134 km | 44 km |
| Apr 16, 2011 | 6 km ENE of Tanuma, Japan | M5.8 | 34 km | 77 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 46 km | 10 km |
| Mar 16, 2011 | 6 km ENE of Asahi, Japan | M5.7 | 150 km | 10 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 104 km | 12 km |
| Jul 16, 2007 | 16 km NNW of Kashiwazaki, Japan | M5.7 | 139 km | 15 km |
| Jun 19, 2005 | 5 km ENE of Narut?, Japan | M5.7 | 142 km | 48 km |
| Feb 11, 1990 | 29 km E of ?arai, Japan | M5.7 | 147 km | 46 km |
| Mar 19, 2011 | 8 km WNW of Daigo, Japan | M5.7 | 97 km | 6 km |
| Dec 3, 1996 | 35 km SE of Muramatsu, Japan | M5.7 | 119 km | 139 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
29 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Ampil | Category 3 | 98 mph | 293 km |
| 2019 | Faxai | Category 3 | 98 mph | 116 km |
| 2019 | Hagibis | Category 1 | 92 mph | 93 km |
| 2018 | Jebi | Category 1 | 81 mph | 257 km |
| 2018 | Shanshan | Category 1 | 75 mph | 245 km |
| 2018 | Jongdari | Category 1 | 81 mph | 264 km |
| 2016 | Mindulle | Category 1 | 75 mph | 238 km |
| 2014 | Phanfone | Category 1 | 81 mph | 188 km |
| 2011 | Roke | Category 2 | 92 mph | 60 km |
| 2007 | Fitow | Category 1 | 81 mph | 93 km |
| 2005 | Mawar | Category 2 | 81 mph | 123 km |
| 2004 | Ma-on | Category 3 | 92 mph | 104 km |
| 2003 | Etau | Category 1 | 52 mph | 292 km |
| 2002 | Higos | Category 2 | 86 mph | 82 km |
| 2001 | Danas | Category 1 | 81 mph | 90 km |
| 2000 | Kirogi | Category 1 | 86 mph | 180 km |
| 1998 | Vicki | Category 2 | 69 mph | 161 km |
| 1998 | Stella | Category 1 | 69 mph | 46 km |
| 1996 | Violet | Category 1 | 81 mph | 217 km |
| 1996 | Kirk | Category 1 | 63 mph | 267 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
10 tsunamis recorded within 500 km. Highest wave on record: 13.0 m (43 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1923 | SAGAMI BAY | Earthquake | 13.0 m | 105,385 | 150 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 150 km |
| 2007 | HONSHU: W COAST | Earthquake | — | 15 | 145 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 99 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | — | 2,100 | 135 km |
| 1633 | SAGAMI BAY | Earthquake | — | 150 | 137 km |
| 1257 | SAGAMI BAY, JAPAN | Earthquake | — | — | 139 km |
| 1241 | KAMAKURA, SAGAMI BAY | Earthquake | — | — | 137 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | — | — | 136 km |
| 818 | TOKAIDO | Eruption + Earthquake | — | — | 137 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Akagisan (16 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 16 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 38 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 42 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 42 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 45 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 58 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 67 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 69 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 70 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 73 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 94 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 98 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 116 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 116 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 123 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 37°F (3°C) | 2.2 in | Coldest |
| February | 37°F (3°C) | 2.6 in | |
| March | 43°F (6°C) | 2.9 in | |
| April | 54°F (12°C) | 3.5 in | |
| May | 62°F (17°C) | 4.2 in | |
| June | 69°F (20°C) | 6.4 in | |
| July | 75°F (24°C) | 6.3 in | |
| August | 78°F (25°C) | 7.0 in | Warmest |
| September | 70°F (21°C) | 7.6 in | Wettest |
| October | 60°F (15°C) | 5.1 in | |
| November | 50°F (10°C) | 2.8 in | |
| December | 41°F (5°C) | 2.0 in | Driest |
Ōmamachō-ōmama has a seasonal temperature swing of 41°F / from 37°F in January to 78°F in August. Total annual precipitation is 52.6 inches, with September being the wettest month (7.6") and December the driest (2.0").