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Weather & Climate in Hachimantai, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hachimantai experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 24°F in January while summers reach 69°F in July. The area gets 238 sunny days per year, above the national average. Annual precipitation totals 53.7 inches (wetter than the 38-inch national average). The area receives 13.1 inches of snow annually. The city sits at an elevation of 748 feet.
Temperature
24°F Jan (-4°C)
69°F Jul (21°C)
| Annual Average | 47.3°F |
| 12% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 238 days/yr |
Geography
| Elevation | 748 ft (228 m) |
| Area | 332.9 sq mi (862.3 km²) |
| Population Density | 75/sq mi |
| Coordinates | 39.8998°N, 141.1299°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,433 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.0.
| May 26, 2003 | 27 km SSW of ?funato, Japan | M7.0 | 123 km | 68 km |
| Jan 6, 1995 | 63 km ESE of Hachinohe, Japan | M7.0 | 97 km | 27 km |
| Jun 13, 2008 | 24 km WSW of Mizusawa, Japan | M6.9 | 99 km | 8 km |
| May 12, 2015 | 32 km SE of ?funato, Japan | M6.8 | 135 km | 35 km |
| Jul 23, 2008 | 29 km ENE of Morioka, Japan | M6.8 | 31 km | 108 km |
| Sep 16, 2011 | 99 km NE of Miyako, Japan | M6.7 | 146 km | 30 km |
| Jun 22, 2011 | 41 km NNE of Miyako, Japan | M6.7 | 92 km | 33 km |
| Feb 16, 2015 | 83 km ENE of Miyako, Japan | M6.7 | 150 km | 23 km |
| Mar 11, 2011 | 50 km ESE of ?tsuchi, Japan | M6.6 | 136 km | 26 km |
| Dec 2, 2001 | 3 km NW of Hanamaki, Japan | M6.5 | 56 km | 124 km |
| Nov 3, 2002 | 30 km SE of ?funato, Japan | M6.4 | 134 km | 39 km |
| Jul 4, 2010 | 37 km E of Miyako, Japan | M6.3 | 108 km | 27 km |
| Apr 19, 2020 | 31 km SE of ?funato, Japan | M6.3 | 135 km | 38 km |
| Jul 23, 2011 | 21 km SSE of ?funato, Japan | M6.3 | 126 km | 41 km |
| Mar 11, 2011 | 49 km ESE of Kamaishi, Japan | M6.3 | 142 km | 45 km |
| Mar 11, 2011 | 47 km SE of Kamaishi, Japan | M6.3 | 141 km | 43 km |
| Jun 17, 2012 | 19 km SSE of ?funato, Japan | M6.3 | 125 km | 36 km |
| Mar 17, 2011 | 57 km NNE of Miyako, Japan | M6.2 | 92 km | 29 km |
| Mar 25, 2011 | 36 km SSE of ?funato, Japan | M6.2 | 141 km | 39 km |
| Dec 28, 1994 | 80 km NE of Miyako, Japan | M6.2 | 134 km | 22 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
6 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Hagibis | Category 1 | 69 mph | 198 km |
| 2002 | Higos | Category 1 | 75 mph | 71 km |
| 2000 | Kirogi | Category 1 | 63 mph | 169 km |
| 1998 | Vicki | Category 1 | 58 mph | 39 km |
| 1996 | Violet | Category 1 | 75 mph | 298 km |
| 1995 | Ryan | Category 1 | 40 mph | 259 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 5.0 m (16 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1763 | SANRIKU | Earthquake | 5.0 m | — | 124 km |
| 2008 | ARATOZAWA, JAPAN | Eruption + Earthquake | 2.5 m | 23 | 99 km |
| 1846 | SANRIKU | Earthquake | 2.0 m | — | 125 km |
| 1793 | W. OFF AOMORI | Earthquake | 1.8 m | 12 | 145 km |
| 1939 | NW. HONSHU ISLAND | Earthquake | 1.2 m | 27 | 141 km |
| 1810 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 57 | 105 km |
| 1804 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 450 | 139 km |
| 1989 | JAPAN | Earthquake | 0.9 m | — | 139 km |
| 1901 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.6 m | — | 134 km |
| 1912 | SANRIKU | Earthquake | 0.5 m | — | 100 km |
| 1945 | SANRIKU | Earthquake | 0.4 m | 2 | 138 km |
| 1960 | SANRIKU | Earthquake | 0.3 m | — | 125 km |
| 2015 | HONSHU | Earthquake | 0.3 m | — | 150 km |
| 1901 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.3 m | 18 | 126 km |
| 1901 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.0 m | — | 134 km |
| 1954 | MIYAGI, JAPAN | Earthquake | — | — | 144 km |
| 1766 | SANRIKU | Earthquake | — | 1,700 | 117 km |
| 1763 | SANRIKU, HACHIONHE | Earthquake | — | — | 116 km |
| 1644 | HONJO, AKITA | Earthquake | — | 117 | 104 km |
| 1088 | MIYAKO, IWATE PREFECTURE | Earthquake | — | — | 77 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
12 volcanoes within 200 km. Closest: Iwatesan (12 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Iwatesan | Complex | 2,038 m (6,686 ft) | 1919 | 12 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 24 km |
| Akita-Komagatake | Stratovolcano(es) | 1,637 m (5,371 ft) | 1971 | 32 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 33 km |
| Towada | Caldera | 1,011 m (3,317 ft) | 915 | 71 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 87 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 108 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 110 km |
| Megata | Maar(s) | 291 m (955 ft) | -2050 | 120 km |
| Chokaisan | Stratovolcano(es) | 2,236 m (7,336 ft) | 1974 | 129 km |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 135 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 153 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 3.2 in | Coldest |
| February | 25°F (-4°C) | 2.8 in | Driest |
| March | 32°F (0°C) | 3.4 in | |
| April | 45°F (7°C) | 3.7 in | |
| May | 54°F (12°C) | 3.7 in | |
| June | 62°F (17°C) | 4.7 in | |
| July | 69°F (21°C) | 6.8 in | |
| August | 72°F (22°C) | 6.8 in | Warmest, Wettest |
| September | 63°F (17°C) | 6.6 in | |
| October | 51°F (11°C) | 4.4 in | |
| November | 40°F (5°C) | 4.1 in | |
| December | 30°F (-1°C) | 3.7 in |
Hachimantai has a seasonal temperature swing of 48°F / from 24°F in January to 72°F in August. Total annual precipitation is 53.7 inches, with August being the wettest month (6.8") and February the driest (2.8").