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Weather & Climate in Inawashiro, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Inawashiro experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 27°F in January while summers reach 69°F in July. The area gets 235 sunny days per year, above the national average. Annual precipitation totals 55.8 inches (wetter than the 38-inch national average). The area receives 11.7 inches of snow annually. The city sits at an elevation of 1,745 feet.
Temperature
27°F Jan (-3°C)
69°F Jul (20°C)
| Annual Average | 47.9°F |
| 11% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 235 days/yr |
Geography
| Elevation | 1,745 ft (532 m) |
| Area | 152.5 sq mi (394.8 km²) |
| Population Density | 91/sq mi |
| Coordinates | 37.5667°N, 140.1167°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,887 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.
| Mar 16, 2022 | 57 km ENE of Namie, Japan | M7.3 | 130 km | 41 km |
| Feb 13, 2021 | 73 km ENE of Namie, Japan | M7.1 | 147 km | 44 km |
| May 1, 2021 | 30 km SSE of Onagawa Ch?, Japan | M6.9 | 148 km | 43 km |
| Jul 16, 2007 | 20 km NNW of Kashiwazaki, Japan | M6.6 | 147 km | 12 km |
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 68 km | 11 km |
| Mar 14, 2010 | 59 km ENE of Namie, Japan | M6.5 | 131 km | 32 km |
| Jun 18, 2019 | 31 km WSW of Tsuruoka, Japan | M6.4 | 132 km | 12 km |
| Aug 4, 2019 | 61 km ENE of Namie, Japan | M6.3 | 133 km | 38 km |
| Mar 11, 2011 | 30 km NNE of Namie, Japan | M6.3 | 95 km | 32 km |
| Jul 30, 2011 | 13 km SSE of Iwaki, Japan | M6.3 | 102 km | 38 km |
| Jul 24, 2011 | 43 km NE of Namie, Japan | M6.3 | 114 km | 40 km |
| Mar 11, 2011 | 61 km ESE of Namie, Japan | M6.2 | 137 km | 40 km |
| Aug 19, 2011 | 61 km ENE of Namie, Japan | M6.2 | 136 km | 47 km |
| Mar 12, 2011 | 29 km SSE of Namie, Japan | M6.1 | 99 km | 38 km |
| May 13, 2011 | 31 km ESE of Namie, Japan | M6.1 | 110 km | 35 km |
| Jul 25, 2003 | 7 km NW of Matsushima, Japan | M6.1 | 122 km | 6 km |
| May 18, 2013 | 50 km NE of Namie, Japan | M6.0 | 121 km | 39 km |
| Apr 3, 2004 | 37 km ESE of Hitachi, Japan | M6.0 | 149 km | 31 km |
| Jul 20, 2000 | 31 km ESE of Hitachi, Japan | M6.0 | 140 km | 47 km |
| Mar 11, 2011 | 17 km ESE of Namie, Japan | M6.0 | 96 km | 49 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
19 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Jebi | Category 1 | 75 mph | 289 km |
| 2019 | Faxai | Category 2 | 92 mph | 161 km |
| 2019 | Hagibis | Category 1 | 81 mph | 82 km |
| 2016 | Lionrock | Category 1 | 81 mph | 289 km |
| 2011 | Roke | Category 1 | 86 mph | 203 km |
| 2007 | Fitow | Category 1 | 75 mph | 234 km |
| 2005 | Mawar | Category 2 | 75 mph | 191 km |
| 2004 | Ma-on | Category 3 | 81 mph | 149 km |
| 2002 | Higos | Category 1 | 81 mph | 93 km |
| 2001 | Danas | Category 1 | 63 mph | 132 km |
| 2000 | Kirogi | Category 1 | 81 mph | 158 km |
| 1998 | Vicki | Category 2 | 63 mph | 121 km |
| 1998 | Stella | Category 1 | 69 mph | 156 km |
| 1996 | Violet | Category 1 | 81 mph | 219 km |
| 1995 | Oscar | Category 3 | 98 mph | 269 km |
| 1993 | Vernon | Category 1 | 75 mph | 129 km |
| 1990 | Flo | Category 1 | 58 mph | 291 km |
| 1981 | Thad | Category 1 | — | 174 km |
| 1981 | Gay | Category 1 | 75 mph | 240 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
13 tsunamis recorded within 500 km. Highest wave on record: 5.8 m (19 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | NW. HONSHU ISLAND | Earthquake | 5.8 m | 36 | 120 km |
| 2016 | E. COAST HONSHU ISLAND | Earthquake | 1.4 m | — | 114 km |
| 1938 | OFF FUKUSHIMA PREFECTURE | Earthquake | 1.3 m | — | 149 km |
| 1938 | JAPAN TRENCH | Earthquake | 0.8 m | — | 149 km |
| 1938 | SANRIKU | Earthquake | 0.8 m | — | 138 km |
| 1938 | SANRIKU | Earthquake | 0.6 m | 1 | 149 km |
| 1938 | SANRIKU | Earthquake | 0.6 m | — | 146 km |
| 2022 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.3 m | 4 | 130 km |
| 1896 | KASHIMA, JAPAN | Earthquake | 0.3 m | — | 142 km |
| 2019 | NIIGATA | Earthquake | 0.1 m | — | 133 km |
| 2021 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.1 m | 1 | 145 km |
| 2007 | HONSHU: W COAST | Earthquake | — | 15 | 144 km |
| 1762 | NW. HONSHU ISLAND | Earthquake | — | — | 138 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Bandaisan (6 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 6 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 17 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 22 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 51 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 51 km |
| Zaozan [Zaosan] | Complex | 1,841 m (6,040 ft) | 1940 | 70 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 80 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 100 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 101 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 105 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 108 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 139 km |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 140 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 165 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 166 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.9 in | |
| February | 27°F (-3°C) | 2.7 in | Coldest, Driest |
| March | 32°F (-0°C) | 3.2 in | |
| April | 44°F (7°C) | 3.9 in | |
| May | 54°F (12°C) | 4.1 in | |
| June | 61°F (16°C) | 5.9 in | |
| July | 69°F (20°C) | 7.0 in | |
| August | 71°F (22°C) | 7.6 in | Warmest, Wettest |
| September | 63°F (17°C) | 7.4 in | |
| October | 52°F (11°C) | 4.8 in | |
| November | 42°F (5°C) | 3.5 in | |
| December | 33°F (0°C) | 2.9 in |
Inawashiro has a seasonal temperature swing of 44°F / from 27°F in February to 71°F in August. Total annual precipitation is 55.8 inches, with August being the wettest month (7.6") and February the driest (2.7").