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Weather & Climate in Hannan, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hannan enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 41°F in January while summers reach 81°F in July. The area gets 285 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 65.7 inches (wetter than the 38-inch national average). The area receives 4.5 inches of snow annually. The city sits at an elevation of 256 feet.
Temperature
41°F Jan (5°C)
81°F Jul (27°C)
| Annual Average | 61.2°F |
| 13% above US avg | |
| January Average | 41°F (5°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 285 days/yr |
Geography
| Elevation | 256 ft (78 m) |
| Area | 13.9 sq mi (36.1 km²) |
| Population Density | 3,755/sq mi |
| Coordinates | 34.3333°N, 135.2500°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
332 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Jan 16, 1995 | 8 km S of Akashi, Japan | M6.9 | 35 km | 22 km |
| Apr 11, 1990 | 11 km ENE of Maizuru, Japan | M6.1 | 128 km | 362 km |
| Apr 1, 2016 | 54 km SE of Shing?, Japan | M5.9 | 149 km | 14 km |
| Apr 12, 2013 | 6 km WNW of Sumoto, Japan | M5.8 | 39 km | 14 km |
| Feb 26, 2025 | 38 km ESE of Shingū, Japan | M5.8 | 131 km | 388 km |
| Jun 1, 1998 | 17 km SW of Owase, Japan | M5.8 | 89 km | 399 km |
| Aug 20, 1999 | 22 km SE of Kainan, Japan | M5.7 | 37 km | 66 km |
| Oct 30, 2000 | western Honshu, Japan | M5.5 | 89 km | 35 km |
| Jun 17, 2018 | near the south coast of western Honshu, Japan | M5.5 | 65 km | 10 km |
| Aug 1, 2007 | 42 km ESE of Owase, Japan | M5.5 | 134 km | 371 km |
| Apr 21, 2000 | 27 km NNE of Maizuru, Japan | M5.5 | 150 km | 347 km |
| Sep 24, 2003 | 5 km WNW of Ayabe, Japan | M5.4 | 109 km | 372 km |
| Jan 11, 2001 | 15 km E of Tottori, Japan | M5.3 | 149 km | 33 km |
| Jan 6, 2004 | 36 km S of Ise, Japan | M5.3 | 132 km | 33 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 68 km | 37 km |
| Apr 22, 1998 | 18 km SE of Hikone, Japan | M5.2 | 141 km | 33 km |
| Apr 15, 2007 | 11 km ENE of Ueno-ebisumachi, Japan | M5.1 | 105 km | 16 km |
| May 28, 1994 | 12 km WNW of Nagahama, Japan | M5.1 | 144 km | 49 km |
| Mar 16, 1999 | 10 km WNW of Kitahama, Japan | M5.1 | 111 km | 33 km |
| Oct 20, 1991 | 45 km SSW of Tanabe, Japan | M5.1 | 111 km | 41 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
54 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2023 | Lan | Category 2 | 81 mph | 82 km |
| 2019 | Hagibis | Category 2 | 92 mph | 281 km |
| 2018 | Jebi | Category 3 | 98 mph | 32 km |
| 2018 | Trami | Category 1 | 92 mph | 64 km |
| 2018 | Cimaron | Category 1 | 92 mph | 59 km |
| 2018 | Jongdari | Category 1 | 81 mph | 171 km |
| 2017 | Lan | Category 2 | 104 mph | 208 km |
| 2017 | Noru | Category 1 | 69 mph | 40 km |
| 2016 | Malakas | Category 1 | 86 mph | 235 km |
| 2015 | Nangka | Category 1 | 81 mph | 172 km |
| 2014 | Phanfone | Category 2 | 92 mph | 142 km |
| 2014 | Halong | Category 1 | 81 mph | 234 km |
| 2012 | Jelawat | Category 1 | 92 mph | 196 km |
| 2011 | Roke | Category 4 | 98 mph | 151 km |
| 2011 | Ma-on | Category 1 | 86 mph | 101 km |
| 2009 | Melor | Category 1 | 86 mph | 130 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 146 km |
| 2007 | Man-yi | Category 1 | 81 mph | 291 km |
| 2005 | Mawar | Category 2 | 92 mph | 241 km |
| 2004 | Ma-on | Category 4 | 92 mph | 227 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
19 tsunamis recorded within 500 km. Highest wave on record: 28.0 m (92 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1854 | NANKAIDO | Earthquake | 28.0 m | 3,000 | 139 km |
| 1707 | NANKAIDO | Earthquake | 25.7 m | 5,000 | 133 km |
| 1927 | SW. HONSHU ISLAND | Eruption + Earthquake | 11.3 m | 3,022 | 142 km |
| 1946 | HONSHU: S COAST | Earthquake | 6.6 m | 1,362 | 148 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 115 km |
| 1520 | KII, KUMANANONADA | Earthquake | 2.0 m | — | 127 km |
| 1510 | OSAKA BAY | Earthquake | 2.0 m | — | 33 km |
| 1403 | KUMANONADA | Earthquake | 2.0 m | — | 135 km |
| 922 | KUMANONADA | Earthquake | 2.0 m | — | 146 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | — | 64 km |
| 1948 | TOKAIDO | Earthquake | 0.6 m | — | 141 km |
| 1995 | KOBE, JAPAN | Earthquake | 0.3 m | 6,434 | 33 km |
| 1791 | OASAKA BAY | Earthquake | — | — | 23 km |
| 1498 | NANKAIDO | Earthquake | — | — | 93 km |
| 1360 | KUMANONADA | Earthquake | — | — | 136 km |
| 1331 | OFF TANABE, WAKAYAMA PREFECTURE | Earthquake | — | — | 71 km |
| 887 | NANKAIDO | Earthquake | — | — | 148 km |
| 745 | OSAKA BAY, JAPAN | Earthquake | — | — | 30 km |
| 704 | KUMANONADA | Earthquake | — | — | 146 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 2.0 in | Coldest |
| February | 42°F (5°C) | 2.4 in | |
| March | 47°F (8°C) | 3.9 in | |
| April | 57°F (14°C) | 5.5 in | |
| May | 65°F (18°C) | 5.9 in | |
| June | 72°F (22°C) | 8.9 in | Wettest |
| July | 81°F (27°C) | 6.1 in | |
| August | 81°F (27°C) | 4.5 in | Warmest |
| September | 74°F (23°C) | 8.2 in | |
| October | 64°F (18°C) | 4.9 in | |
| November | 54°F (12°C) | 3.2 in | |
| December | 46°F (8°C) | 1.6 in | Driest |
Hannan has a seasonal temperature swing of 40°F / from 41°F in January to 81°F in August. Total annual precipitation is 56.9 inches, with June being the wettest month (8.9") and December the driest (1.6").