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Weather & Climate in Sanjō, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sanjō experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 34°F in January while summers reach 76°F in July. The area gets 178 sunny days per year. Annual precipitation totals 88.0 inches (wetter than the 38-inch national average). The area receives 19.3 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 30 feet.
Temperature
34°F Jan (1°C)
76°F Jul (24°C)
| Annual Average | 54.8°F |
| 1% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 178 days/yr |
Geography
| Elevation | 30 ft (9 m) |
| Area | 166.8 sq mi (432.0 km²) |
| Population Density | 567/sq mi |
| Coordinates | 37.6167°N, 138.9500°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
520 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.5.
| Jan 1, 2024 | 2024 Noto Peninsula, Japan Earthquake | M7.5 | 149 km | 10 km |
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 145 km | 11 km |
| Jul 16, 2007 | 20 km NNW of Kashiwazaki, Japan | M6.6 | 45 km | 12 km |
| Jun 18, 2019 | 31 km WSW of Tsuruoka, Japan | M6.4 | 123 km | 12 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 84 km | 9 km |
| May 5, 2023 | 49 km NE of Anamizu, Japan | M6.2 | 146 km | 10 km |
| Apr 12, 2011 | 8 km WSW of Ishikawa, Japan | M5.9 | 138 km | 11 km |
| Jan 9, 2024 | 53 km WSW of Sado, Japan | M5.9 | 106 km | 10 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 90 km | 10 km |
| Jun 2, 2024 | 40 km NE of Anamizu, Japan | M5.7 | 150 km | 9 km |
| Mar 19, 2011 | 8 km WNW of Daigo, Japan | M5.7 | 148 km | 6 km |
| Dec 3, 1996 | 35 km SE of Muramatsu, Japan | M5.7 | 49 km | 139 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 94 km | 12 km |
| Jul 16, 2007 | 16 km NNW of Kashiwazaki, Japan | M5.7 | 44 km | 15 km |
| Jan 1, 2024 | 54 km NE of Anamizu, Japan | M5.6 | 137 km | 10 km |
| May 5, 2023 | 43 km NE of Anamizu, Japan | M5.6 | 148 km | 10 km |
| Jan 1, 2024 | 56 km NE of Anamizu, Japan | M5.5 | 135 km | 10 km |
| Apr 11, 2011 | 20 km SSW of Ishikawa, Japan | M5.5 | 143 km | 10 km |
| Apr 11, 2011 | 8 km WSW of Iiyama, Japan | M5.5 | 107 km | 17 km |
| Sep 29, 2010 | 35 km NNW of Kuroiso, Japan | M5.5 | 92 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
21 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2019 | Faxai | Category 2 | 92 mph | 234 km |
| 2019 | Hagibis | Category 1 | 81 mph | 159 km |
| 2018 | Jebi | Category 1 | 86 mph | 210 km |
| 2011 | Roke | Category 1 | 81 mph | 192 km |
| 2007 | Fitow | Category 1 | 75 mph | 225 km |
| 2005 | Mawar | Category 2 | 75 mph | 245 km |
| 2004 | Ma-on | Category 3 | 81 mph | 237 km |
| 2004 | Songda | Category 1 | 75 mph | 293 km |
| 2004 | Chaba | Category 1 | 69 mph | 263 km |
| 2002 | Higos | Category 1 | 81 mph | 175 km |
| 2001 | Danas | Category 1 | 63 mph | 187 km |
| 2000 | Kirogi | Category 1 | 81 mph | 243 km |
| 1998 | Vicki | Category 2 | 69 mph | 106 km |
| 1998 | Stella | Category 1 | 63 mph | 171 km |
| 1996 | Kirk | Category 1 | 63 mph | 233 km |
| 1995 | Ryan | Category 1 | 40 mph | 254 km |
| 1994 | Orchid | Category 1 | 69 mph | 211 km |
| 1993 | Vernon | Category 1 | 75 mph | 230 km |
| 1991 | Mireille | Category 1 | 98 mph | 271 km |
| 1990 | Flo | Category 1 | 58 mph | 221 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
14 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 | 149 km |
| 1833 | NW. HONSHU ISLAND | Earthquake | 9.0 m | 85 | 144 km |
| 1964 | NW. HONSHU ISLAND | Earthquake | 5.8 m | 36 | 89 km |
| 1987 | HONSHU ISLAND | Earthquake | 0.2 m | - | 98 km |
| 2019 | NIIGATA | Earthquake | 0.1 m | - | 123 km |
| 2023 | NOTO PENINSULA, JAPAN | Earthquake | 0.1 m | 1 | 145 km |
| 2007 | HONSHU: W COAST | Earthquake | - | 15 | 42 km |
| 1802 | NW. HONSHU ISLAND | Earthquake | - | 19 | 58 km |
| 1762 | NW. HONSHU ISLAND | Earthquake | - | - | 58 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | - | 2,100 | 88 km |
| 1614 | NIIGATA PREFECTURE | Earthquake | - | - | 85 km |
| 1448 | SADO, JAPAN | Earthquake | - | - | 67 km |
| 887 | NIIGATA | Earthquake | - | 2,000 | 76 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | - | - | 102 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Numazawa (58 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 58 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 79 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 98 km |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 99 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 104 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 105 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 106 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 108 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 110 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 110 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 112 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 115 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 117 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 117 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 120 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 11.5 in | Coldest |
| February | 34°F (1°C) | 7.8 in | |
| March | 39°F (4°C) | 5.4 in | |
| April | 50°F (10°C) | 4.4 in | |
| May | 61°F (16°C) | 4.1 in | Driest |
| June | 68°F (20°C) | 5.2 in | |
| July | 76°F (24°C) | 7.1 in | |
| August | 78°F (26°C) | 5.2 in | Warmest |
| September | 71°F (21°C) | 7.2 in | |
| October | 60°F (15°C) | 7.2 in | |
| November | 49°F (9°C) | 9.5 in | |
| December | 39°F (4°C) | 13.4 in | Wettest |
Sanjō has a seasonal temperature swing of 45°F / from 34°F in January to 78°F in August. Total annual precipitation is 88.0 inches, with December being the wettest month (13.4") and May the driest (4.1").