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Weather & Climate in Annaka, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Annaka experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 36°F in January while summers reach 75°F in July. The area gets 248 sunny days per year, above the national average. Annual precipitation totals 48.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 558 feet.
Temperature
36°F Jan (2°C)
75°F Jul (24°C)
| Annual Average | 55.4°F |
| 3% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 248 days/yr |
Geography
| Elevation | 558 ft (170 m) |
| Area | 106.7 sq mi (276.3 km²) |
| Population Density | 534/sq mi |
| Coordinates | 36.3301°N, 138.8959°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,198 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.6.
| Jul 16, 2007 | 20 km NNW of Kashiwazaki, Japan | M6.6 | 140 km | 12 km |
| Mar 11, 2011 | 13 km E of Arai, Japan | M6.2 | 89 km | 9 km |
| Mar 15, 2011 | 6 km NNW of Fujinomiya, Japan | M6.0 | 121 km | 9 km |
| Jul 23, 2005 | 9 km WSW of Ichihara, Japan | M5.9 | 135 km | 61 km |
| Feb 25, 2013 | 29 km NE of Numata, Japan | M5.8 | 65 km | 10 km |
| Apr 16, 2011 | 6 km ENE of Tanuma, Japan | M5.8 | 68 km | 77 km |
| Jul 16, 2007 | 16 km NNW of Kashiwazaki, Japan | M5.7 | 136 km | 15 km |
| Dec 3, 1996 | 35 km SE of Muramatsu, Japan | M5.7 | 139 km | 139 km |
| Mar 19, 2011 | 8 km WNW of Daigo, Japan | M5.7 | 133 km | 6 km |
| Mar 11, 2011 | eastern Honshu, Japan | M5.7 | 86 km | 12 km |
| Mar 6, 1996 | 13 km NNE of Gotenba, Japan | M5.6 | 100 km | 33 km |
| Nov 9, 2013 | 3 km WSW of Moriya, Japan | M5.6 | 107 km | 64 km |
| Dec 21, 1996 | 3 km E of Sugito, Japan | M5.5 | 85 km | 45 km |
| Jul 15, 2011 | 5 km NE of Sakai, Japan | M5.5 | 89 km | 89 km |
| Feb 15, 2005 | 2 km NNW of Iwatsuki, Japan | M5.5 | 81 km | 46 km |
| Sep 29, 2010 | 35 km NNW of Kuroiso, Japan | M5.5 | 136 km | 33 km |
| Mar 15, 2012 | 3 km ENE of ?me, Japan | M5.5 | 68 km | 104 km |
| Apr 11, 2011 | 8 km WSW of Iiyama, Japan | M5.5 | 76 km | 17 km |
| Nov 16, 2013 | 3 km E of Chiba, Japan | M5.5 | 139 km | 59 km |
| Aug 15, 1998 | 22 km WSW of Hotaka, Japan | M5.5 | 112 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
31 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 | 129 km |
| 2019 | Hagibis | Category 2 | 92 mph | 93 km |
| 2018 | Jebi | Category 1 | 86 mph | 231 km |
| 2018 | Shanshan | Category 1 | 75 mph | 262 km |
| 2018 | Jongdari | Category 1 | 81 mph | 243 km |
| 2016 | Mindulle | Category 1 | 75 mph | 232 km |
| 2014 | Phanfone | Category 1 | 81 mph | 165 km |
| 2011 | Roke | Category 2 | 92 mph | 55 km |
| 2007 | Fitow | Category 1 | 81 mph | 86 km |
| 2005 | Mawar | Category 2 | 81 mph | 137 km |
| 2004 | Ma-on | Category 3 | 92 mph | 115 km |
| 2004 | Chaba | Category 1 | 69 mph | 279 km |
| 2003 | Etau | Category 1 | 52 mph | 256 km |
| 2002 | Higos | Category 2 | 86 mph | 102 km |
| 2001 | Danas | Category 1 | 81 mph | 108 km |
| 2000 | Kirogi | Category 1 | 86 mph | 199 km |
| 1998 | Vicki | Category 2 | 69 mph | 131 km |
| 1998 | Zeb | Category 1 | 58 mph | 287 km |
| 1998 | Stella | Category 1 | 69 mph | 74 km |
| 1996 | Violet | Category 1 | 81 mph | 234 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 | 147 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 147 km |
| 2007 | HONSHU: W COAST | Earthquake | - | 15 | 143 km |
| 1855 | TOKAIDO | Earthquake | - | 6,757 | 111 km |
| 1751 | NW. HONSHU ISLAND | Eruption + Earthquake | - | 2,100 | 120 km |
| 1633 | SAGAMI BAY | Earthquake | - | 150 | 129 km |
| 1448 | SADO, JAPAN | Earthquake | - | - | 144 km |
| 1257 | SAGAMI BAY, JAPAN | Earthquake | - | - | 137 km |
| 1241 | KAMAKURA, SAGAMI BAY | Earthquake | - | - | 134 km |
| 887 | NIIGATA | Earthquake | - | 2,000 | 148 km |
| 863 | NW. HONSHU ISLAND | Eruption + Earthquake | - | - | 117 km |
| 818 | TOKAIDO | Eruption + Earthquake | - | - | 131 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Harunasan (17 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 17 km |
| Asamayama | Complex | 2,568 m (8,425 ft) | 2019 | 34 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 37 km |
| Kusatsu-Shiranesan | Stratovolcano(es) | 2,165 m (7,103 ft) | 2018 | 46 km |
| Shiga | Shield(s) | 2,041 m (6,696 ft) | Unknown | 52 km |
| Yokodake | Stratovolcano(es) | 2,480 m (8,136 ft) | 1200 | 58 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 68 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 72 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 75 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 78 km |
| Myokosan | Stratovolcano | 2,454 m (8,051 ft) | -750 | 94 km |
| Niigata-Yakeyama | Lava dome | 2,400 m (7,874 ft) | 1998 | 101 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 101 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 109 km |
| Washiba-Kumonotaira | Shield(s) | 2,924 m (9,593 ft) | Unknown | 117 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 2.0 in | Coldest |
| February | 36°F (2°C) | 2.4 in | |
| March | 42°F (6°C) | 2.8 in | |
| April | 53°F (12°C) | 3.2 in | |
| May | 62°F (16°C) | 3.8 in | |
| June | 68°F (20°C) | 6.1 in | |
| July | 75°F (24°C) | 5.9 in | |
| August | 77°F (25°C) | 6.5 in | Warmest |
| September | 69°F (21°C) | 7.2 in | Wettest |
| October | 59°F (15°C) | 4.7 in | |
| November | 49°F (9°C) | 2.5 in | |
| December | 40°F (4°C) | 1.7 in | Driest |
Annaka has a seasonal temperature swing of 41°F / from 36°F in January to 77°F in August. Total annual precipitation is 48.7 inches, with September being the wettest month (7.2") and December the driest (1.7").