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Weather & Climate in Kosaka, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Kosaka experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 24°F in January while summers reach 68°F in July. The area gets 231 sunny days per year, above the national average. Annual precipitation totals 57.6 inches (wetter than the 38-inch national average). The area receives 16.1 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 902 feet.
Temperature
24°F Jan (-4°C)
68°F Jul (20°C)
| Annual Average | 46.0°F |
| 15% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 231 days/yr |
Geography
| Elevation | 902 ft (275 m) |
| Area | 77.9 sq mi (201.7 km²) |
| Population Density | 61/sq mi |
| Coordinates | 40.3790°N, 140.7313°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
833 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.0.
| Jan 6, 1995 | 63 km ESE of Hachinohe, Japan | M7.0 | 123 km | 27 km |
| Jul 23, 2008 | 29 km ENE of Morioka, Japan | M6.8 | 89 km | 108 km |
| Jun 22, 2011 | 41 km NNE of Miyako, Japan | M6.7 | 134 km | 33 km |
| Dec 2, 2001 | 3 km NW of Hanamaki, Japan | M6.5 | 113 km | 124 km |
| Mar 11, 2011 | 88 km WNW of Noshiro, Japan | M6.2 | 142 km | 10 km |
| Mar 17, 2011 | 57 km NNE of Miyako, Japan | M6.2 | 125 km | 29 km |
| Aug 10, 2014 | 78 km E of Mutsu, Japan | M6.1 | 146 km | 41 km |
| Mar 27, 2012 | 24 km NNE of Miyako, Japan | M6.1 | 124 km | 15 km |
| Jan 7, 1995 | 76 km NNE of Miyako, Japan | M6.0 | 139 km | 32 km |
| Apr 1, 2024 | 7 km SW of Kuji, Japan | M5.9 | 86 km | 73 km |
| Sep 3, 1998 | 19 km W of Shizukuishi, Japan | M5.9 | 74 km | 38 km |
| Sep 26, 2017 | 73 km ESE of Hachinohe, Japan | M5.8 | 137 km | 37 km |
| Mar 20, 2011 | 6 km WSW of ?tsuchi, Japan | M5.8 | 148 km | 42 km |
| Mar 11, 2011 | 18 km E of Misawa, Japan | M5.8 | 81 km | 45 km |
| Mar 11, 2011 | 31 km N of T?no, Japan | M5.8 | 113 km | 35 km |
| Mar 16, 2011 | 27 km NNE of Miyako, Japan | M5.7 | 122 km | 36 km |
| May 7, 2011 | 69 km ESE of Hachinohe, Japan | M5.7 | 129 km | 35 km |
| Jul 4, 2014 | 11 km E of Miyako, Japan | M5.7 | 141 km | 50 km |
| Jul 26, 1999 | 26 km ENE of Misawa, Japan | M5.7 | 91 km | 104 km |
| Aug 10, 2004 | 2 km SE of Miyako, Japan | M5.7 | 133 km | 70 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
5 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 | 259 km |
| 2002 | Higos | Category 1 | 75 mph | 58 km |
| 2000 | Kirogi | Category 1 | 63 mph | 227 km |
| 1998 | Vicki | Category 1 | 58 mph | 72 km |
| 1995 | Ryan | Category 1 | 40 mph | 233 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
16 tsunamis recorded within 500 km. Highest wave on record: 14.9 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1983 | NOSHIRO, JAPAN | Earthquake | 14.9 m | 104 | 138 km |
| 1763 | SANRIKU | Earthquake | 5.0 m | - | 117 km |
| 1793 | W. OFF AOMORI | Earthquake | 1.8 m | 12 | 84 km |
| 1939 | NW. HONSHU ISLAND | Earthquake | 1.2 m | 27 | 109 km |
| 1810 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 57 | 89 km |
| 2025 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.7 m | - | 140 km |
| 1964 | NW. HONSHU ISLAND | Earthquake | 0.6 m | - | 147 km |
| 1912 | SANRIKU | Earthquake | 0.5 m | - | 108 km |
| 1945 | SANRIKU | Earthquake | 0.4 m | 2 | 129 km |
| 1901 | OFF NORTHEAST COAST HONSHU | Earthquake | 0.3 m | 18 | 135 km |
| 1964 | NW. HONSHU ISLAND | Earthquake | - | - | 147 km |
| 1766 | SANRIKU | Earthquake | - | 1,700 | 58 km |
| 1763 | SANRIKU, HACHIONHE | Earthquake | - | - | 113 km |
| 1644 | HONJO, AKITA | Earthquake | - | 117 | 122 km |
| 1341 | JUSANKO, TSUGARU AOMORI PREFECTURE | Earthquake | - | 2,600 | 125 km |
| 1088 | MIYAKO, IWATE PREFECTURE | Earthquake | - | - | 133 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Towada (19 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Towada | Caldera | 1,011 m (3,317 ft) | 915 | 19 km |
| Hakkodasan | Stratovolcano(es) | 1,585 m (5,200 ft) | 1550 | 34 km |
| Akita-Yakeyama | Stratovolcano | 1,366 m (4,482 ft) | 1997 | 46 km |
| Iwakisan | Stratovolcano | 1,625 m (5,331 ft) | 1863 | 48 km |
| Hachimantai | Stratovolcano | 1,613 m (5,292 ft) | -5350 | 48 km |
| Iwatesan | Complex | 2,038 m (6,686 ft) | 1919 | 63 km |
| Akita-Komagatake | Stratovolcano(es) | 1,637 m (5,371 ft) | 1971 | 69 km |
| Megata | Maar(s) | 291 m (955 ft) | -2050 | 98 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 105 km |
| Chokaisan | Stratovolcano(es) | 2,236 m (7,336 ft) | 1974 | 154 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 158 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 163 km |
| Oshima-Oshima | Stratovolcano | 732 m (2,402 ft) | 1790 | 170 km |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 184 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 4.3 in | Coldest |
| February | 25°F (-4°C) | 3.6 in | Driest |
| March | 30°F (-1°C) | 3.6 in | |
| April | 42°F (5°C) | 3.9 in | |
| May | 52°F (11°C) | 3.7 in | |
| June | 60°F (15°C) | 4.5 in | |
| July | 68°F (20°C) | 6.3 in | |
| August | 71°F (21°C) | 6.7 in | Warmest, Wettest |
| September | 62°F (17°C) | 6.7 in | |
| October | 50°F (10°C) | 4.9 in | |
| November | 40°F (4°C) | 4.9 in | |
| December | 30°F (-1°C) | 4.7 in |
Kosaka has a seasonal temperature swing of 46°F / from 24°F in January to 71°F in August. Total annual precipitation is 57.6 inches, with August being the wettest month (6.7") and February the driest (3.6").