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Weather & Climate in Koumibara, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Koumibara has a cool climate with an average annual temperature of 45°F (7°C). Winters average 24°F in January while summers reach 66°F in July. The area gets 229 sunny days per year, above the national average. Annual precipitation totals 59.0 inches (wetter than the 38-inch national average). The area receives 7.9 inches of snow annually. The city sits at an elevation of 3,615 feet.
Temperature
24°F Jan (-5°C)
66°F Jul (19°C)
| Annual Average | 45.3°F |
| 16% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 229 days/yr |
Geography
| Elevation | 3,615 ft (1,102 m) |
| Area | 65.1 sq mi (168.7 km²) |
| Population Density | 67/sq mi |
| Coordinates | 36.0557°N, 138.4782°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
935 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.2.
| Aug 10, 2009 | 8 km NE of Sagara, Japan | M6.2 | 147 km | 40 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 107 km | 9 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 88 km | 9 km |
| Jan 15, 2007 | 15 km WSW of Heda, Japan | M5.9 | 130 km | 170 km |
| Jul 23, 2005 | 9 km WSW of Ichihara, Japan | M5.9 | 149 km | 61 km |
| Apr 16, 2011 | 6 km ENE of Tanuma, Japan | M5.8 | 111 km | 77 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 111 km | 10 km |
| Feb 1, 1992 | 4 km SSE of Miura, Japan | M5.8 | 149 km | 100 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 100 km | 12 km |
| Mar 6, 1996 | 13 km NNE of Gotenba, Japan | M5.6 | 83 km | 33 km |
| May 3, 1998 | 14 km SW of It?, Japan | M5.6 | 140 km | 34 km |
| Nov 9, 2013 | 3 km WSW of Moriya, Japan | M5.6 | 135 km | 64 km |
| Mar 4, 1997 | 9 km SSW of It?, Japan | M5.6 | 139 km | 10 km |
| Apr 20, 2006 | 16 km SE of It?, Japan | M5.6 | 149 km | 23 km |
| Dec 21, 1996 | 3 km E of Sugito, Japan | M5.5 | 116 km | 45 km |
| Feb 15, 2005 | 2 km NNW of Iwatsuki, Japan | M5.5 | 109 km | 46 km |
| Mar 15, 2012 | 3 km ENE of ?me, Japan | M5.5 | 77 km | 104 km |
| Jul 15, 2011 | 5 km NE of Sakai, Japan | M5.5 | 124 km | 89 km |
| Aug 15, 1998 | 22 km WSW of Hotaka, Japan | M5.5 | 79 km | 10 km |
| Apr 11, 2011 | 8 km WSW of Iiyama, Japan | M5.5 | 86 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
33 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Faxai | Category 3 | 98 mph | 139 km |
| 2019 | Hagibis | Category 2 | 92 mph | 97 km |
| 2018 | Jebi | Category 1 | 86 mph | 217 km |
| 2018 | Shanshan | Category 1 | 75 mph | 276 km |
| 2018 | Jongdari | Category 1 | 81 mph | 207 km |
| 2016 | Mindulle | Category 1 | 75 mph | 216 km |
| 2014 | Phanfone | Category 1 | 81 mph | 129 km |
| 2011 | Roke | Category 2 | 92 mph | 67 km |
| 2009 | Melor | Category 1 | 86 mph | 286 km |
| 2007 | Fitow | Category 1 | 81 mph | 83 km |
| 2005 | Mawar | Category 2 | 81 mph | 141 km |
| 2004 | Ma-on | Category 3 | 92 mph | 121 km |
| 2004 | Chaba | Category 1 | 69 mph | 261 km |
| 2003 | Etau | Category 1 | 58 mph | 212 km |
| 2002 | Higos | Category 2 | 86 mph | 129 km |
| 2001 | Danas | Category 1 | 81 mph | 131 km |
| 2000 | Kirogi | Category 1 | 86 mph | 218 km |
| 1998 | Vicki | Category 2 | 86 mph | 113 km |
| 1998 | Zeb | Category 1 | 58 mph | 254 km |
| 1998 | Stella | Category 1 | 69 mph | 111 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
12 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 | 141 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 141 km |
| 2009 | HONSHU: S COAST | Earthquake | 0.6 m | 1 | 147 km |
| 1857 | TOKAIDO | Earthquake | — | — | 141 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 127 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | — | 2,100 | 132 km |
| 1633 | SAGAMI BAY | Earthquake | — | 150 | 115 km |
| 1589 | SURUGA, JAPAN | Earthquake | — | — | 142 km |
| 1257 | SAGAMI BAY, JAPAN | Earthquake | — | — | 133 km |
| 1241 | KAMAKURA, SAGAMI BAY | Earthquake | — | — | 127 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | — | — | 124 km |
| 818 | TOKAIDO | Eruption + Earthquake | — | — | 121 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Yokodake (15 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 15 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 39 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 58 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 63 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 70 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 81 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 82 km |
| Norikuradake | Stratovolcano(es) | 3,026 m (9,928 ft) | -50 | 83 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 85 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 89 km |
| Ontakesan | Complex | 3,067 m (10,062 ft) | 2014 | 92 km |
| Midagahara | Stratovolcano | 2,621 m (8,599 ft) | 1839 | 98 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 98 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 104 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 104 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 1.4 in | Coldest |
| February | 25°F (-4°C) | 2.1 in | |
| March | 31°F (-1°C) | 3.3 in | |
| April | 43°F (6°C) | 4.5 in | |
| May | 52°F (11°C) | 5.2 in | |
| June | 58°F (15°C) | 8.2 in | |
| July | 66°F (19°C) | 8.1 in | |
| August | 68°F (20°C) | 8.6 in | Warmest |
| September | 60°F (16°C) | 8.8 in | Wettest |
| October | 49°F (9°C) | 5.2 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 30°F (-1°C) | 1.2 in | Driest |
Koumibara has a seasonal temperature swing of 44°F / from 24°F in January to 68°F in August. Total annual precipitation is 59.0 inches, with September being the wettest month (8.8") and December the driest (1.2").