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Iiyama, Japan
Full City Profile
4.2
/5.0
A
Great
20,118
Population
257/sq mi density
1,020 ft
Elevation
311 meters
50°F
Avg Temperature
10°C
A
Overall
4.2 / 5.0
Strong
B
Economy
3.3 / 5.0
$30,100 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$76,000 home value, $380/mo rent
Iiyama experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 27°F in January while summers reach 71°F in July. The area gets 223 sunny days per year. Annual precipitation totals 62.5 inches. The area receives 18.5 inches of snow annually.
Temperature
27°F Jan (-3°C)
71°F Jul (22°C)
| Annual Average | 49.6°F |
| 8% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 223 days/yr |
Geography
| Elevation | 1,020 ft (311 m) |
| Area | 78.2 sq mi (202.4 km²) |
| Population Density | 257/sq mi |
| Coordinates | 36.8500°N, 138.3667°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Tsunami History
13 tsunamis recorded within 500 km. Highest wave on record: 11.3 m (37 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2024 | HONSHU: W COAST | Eruption + Earthquake | 11.3 m | 549 | 120 km |
| 1993 | HONSHU ISLAND | Earthquake | 0.5 m | — | 132 km |
| 1987 | HONSHU ISLAND | Earthquake | 0.2 m | — | 80 km |
| 2023 | NOTO PENINSULA, JAPAN | Earthquake | 0.1 m | 1 | 121 km |
| 2007 | HONSHU: W COAST | Earthquake | — | 15 | 81 km |
| 1892 | SW. HONSHU ISLAND | Earthquake | — | 1 | 140 km |
| 1802 | NW. HONSHU ISLAND | Earthquake | — | 19 | 95 km |
| 1762 | NW. HONSHU ISLAND | Earthquake | — | — | 142 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | — | 2,100 | 46 km |
| 1614 | NIIGATA PREFECTURE | Earthquake | — | — | 79 km |
| 1448 | SADO, JAPAN | Earthquake | — | — | 74 km |
| 887 | NIIGATA | Earthquake | — | 2,000 | 76 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | — | — | 43 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Shiga (23 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 23 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 23 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 30 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 31 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 51 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 60 km |
| Midagahara | Stratovolcano | 2,621 m (8,599 ft) | 1839 | 76 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 80 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 83 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 85 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 85 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 90 km |
| Yakedake | Stratovolcano(es) | 2,455 m (8,054 ft) | 1995 | 98 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 101 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 102 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 5.4 in | Coldest |
| February | 27°F (-3°C) | 4.3 in | |
| March | 33°F (1°C) | 3.8 in | |
| April | 46°F (8°C) | 3.7 in | Driest |
| May | 57°F (14°C) | 4.0 in | |
| June | 64°F (18°C) | 6.1 in | |
| July | 71°F (22°C) | 7.3 in | Wettest |
| August | 74°F (23°C) | 6.0 in | Warmest |
| September | 65°F (19°C) | 7.2 in | |
| October | 54°F (12°C) | 5.2 in | |
| November | 44°F (6°C) | 4.5 in | |
| December | 33°F (1°C) | 5.0 in |
Iiyama has a seasonal temperature swing of 47°F / from 27°F in January to 74°F in August. Total annual precipitation is 62.5 inches, with July being the wettest month (7.3") and April the driest (3.7").