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Weather & Climate in Nagano, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Nagano experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 31°F in January while summers reach 71°F in July. The area gets 245 sunny days per year, above the national average. Annual precipitation totals 50.4 inches (wetter than the 38-inch national average). The area receives 4.6 inches of snow annually. The city sits at an elevation of 338 feet.
Temperature
31°F Jan (-1°C)
71°F Jul (21°C)
| Annual Average | 50.9°F |
| 6% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 245 days/yr |
Geography
| Elevation | 338 ft (103 m) |
| Area | 74.7 sq mi (193.3 km²) |
| Population Density | 153/sq mi |
| Coordinates | 38.0908°N, 140.6553°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
2,517 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 | 91 km | 41 km |
| Apr 7, 2011 | 29 km ESE of Ishinomaki, Japan | M7.1 | 84 km | 42 km |
| Feb 13, 2021 | 73 km ENE of Namie, Japan | M7.1 | 106 km | 44 km |
| Mar 20, 2021 | 30 km E of Ishinomaki, Japan | M7.0 | 96 km | 43 km |
| May 26, 2003 | 27 km SSW of ?funato, Japan | M7.0 | 116 km | 68 km |
| Jul 19, 2008 | 107 km E of Namie, Japan | M7.0 | 149 km | 22 km |
| May 1, 2021 | 30 km SSE of Onagawa Ch?, Japan | M6.9 | 83 km | 43 km |
| Jun 13, 2008 | 24 km WSW of Mizusawa, Japan | M6.9 | 106 km | 8 km |
| Apr 11, 2011 | 17 km SSW of Ishikawa, Japan | M6.6 | 123 km | 11 km |
| Mar 14, 2010 | 59 km ENE of Namie, Japan | M6.5 | 91 km | 32 km |
| Nov 3, 2002 | 30 km SE of ?funato, Japan | M6.4 | 145 km | 39 km |
| Jun 18, 2019 | 31 km WSW of Tsuruoka, Japan | M6.4 | 120 km | 12 km |
| Jul 23, 2011 | 21 km SSE of ?funato, Japan | M6.3 | 135 km | 41 km |
| Aug 4, 2019 | 61 km ENE of Namie, Japan | M6.3 | 91 km | 38 km |
| Jun 17, 2012 | 19 km SSE of ?funato, Japan | M6.3 | 138 km | 36 km |
| Mar 11, 2011 | 103 km E of Namie, Japan | M6.3 | 142 km | 51 km |
| Jul 30, 2011 | 13 km SSE of Iwaki, Japan | M6.3 | 131 km | 38 km |
| Jul 24, 2011 | 43 km NE of Namie, Japan | M6.3 | 76 km | 40 km |
| Apr 19, 2020 | 31 km SE of ?funato, Japan | M6.3 | 148 km | 38 km |
| Mar 11, 2011 | 30 km NNE of Namie, Japan | M6.3 | 63 km | 32 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 | 263 km |
| 2019 | Faxai | Category 2 | 92 mph | 171 km |
| 2019 | Hagibis | Category 1 | 81 mph | 101 km |
| 2016 | Lionrock | Category 1 | 75 mph | 299 km |
| 2011 | Roke | Category 1 | 81 mph | 276 km |
| 2005 | Mawar | Category 2 | 75 mph | 224 km |
| 2004 | Ma-on | Category 2 | 69 mph | 162 km |
| 2002 | Higos | Category 1 | 75 mph | 18 km |
| 2001 | Danas | Category 1 | 63 mph | 189 km |
| 2000 | Sonamu | Category 1 | 63 mph | 274 km |
| 2000 | Kirogi | Category 1 | 69 mph | 122 km |
| 1998 | Vicki | Category 2 | 63 mph | 119 km |
| 1998 | Stella | Category 1 | 63 mph | 227 km |
| 1996 | Violet | Category 1 | 81 mph | 225 km |
| 1995 | Oscar | Category 3 | 98 mph | 269 km |
| 1995 | Ryan | Category 1 | 40 mph | 291 km |
| 1993 | Vernon | Category 1 | 75 mph | 124 km |
| 1981 | Thad | Category 1 | — | 238 km |
| 1981 | Gay | Category 1 | 75 mph | 251 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 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 | 129 km |
| 1835 | SANRIKU | Earthquake | 5.0 m | — | 111 km |
| 1861 | OFF MIYAGI | Earthquake | 3.9 m | — | 126 km |
| 2008 | ARATOZAWA, JAPAN | Eruption + Earthquake | 2.5 m | 23 | 106 km |
| 2016 | E. COAST HONSHU ISLAND | Earthquake | 1.4 m | — | 101 km |
| 1938 | OFF FUKUSHIMA PREFECTURE | Earthquake | 1.3 m | — | 120 km |
| 1897 | SANRIKU | Earthquake | 1.0 m | — | 109 km |
| 1804 | NW. HONSHU ISLAND | Earthquake | 1.0 m | 450 | 123 km |
| 1938 | SANRIKU | Earthquake | 0.8 m | — | 142 km |
| 1936 | SANRIKU | Earthquake | 0.7 m | — | 136 km |
| 1978 | SANRIKU | Earthquake | 0.6 m | 28 | 121 km |
| 1938 | SANRIKU | Earthquake | 0.6 m | 1 | 144 km |
| 1938 | SANRIKU | Earthquake | 0.6 m | — | 135 km |
| 2022 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.3 m | 4 | 91 km |
| 2008 | OFF EAST COAST OF HONSHU ISLAND | Earthquake | 0.2 m | — | 149 km |
| 2019 | NIIGATA | Earthquake | 0.1 m | — | 120 km |
| 2021 | OFF FUKUSHIMA PREFECTURE | Earthquake | 0.1 m | 1 | 103 km |
| 1927 | SANRIKU | Earthquake | 0.1 m | — | 120 km |
| 1898 | HONSHU ISLAND | Earthquake | 0.1 m | — | 130 km |
| 2011 | E. COAST HONSHU ISLAND | Earthquake | 0.1 m | 3 | 84 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Zaozan [Zaosan] (20 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Zaozan [Zaosan] | Complex | 1,841 m (6,040 ft) | 1940 | 20 km |
| Azumayama | Stratovolcano(es) | 1,949 m (6,394 ft) | 1977 | 54 km |
| Adatarayama | Stratovolcano(es) | 1,728 m (5,669 ft) | 1996 | 59 km |
| Naruko | Caldera | 470 m (1,542 ft) | 837 | 71 km |
| Bandaisan | Stratovolcano | 1,816 m (5,958 ft) | 1888 | 75 km |
| Kurikomayama | Stratovolcano | 1,627 m (5,338 ft) | 1950 | 97 km |
| Numazawa | Shield | 835 m (2,740 ft) | -3400 | 120 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 124 km |
| Chokaisan | Stratovolcano(es) | 2,236 m (7,336 ft) | 1974 | 124 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 153 km |
| Hiuchigatake | Stratovolcano | 2,356 m (7,730 ft) | 1544 | 175 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 176 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 180 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 183 km |
| Akita-Komagatake | Stratovolcano(es) | 1,637 m (5,371 ft) | 1971 | 186 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.3 in | Coldest, Driest |
| February | 31°F (-0°C) | 2.3 in | |
| March | 36°F (2°C) | 2.8 in | |
| April | 48°F (9°C) | 3.5 in | |
| May | 57°F (14°C) | 3.8 in | |
| June | 64°F (18°C) | 5.4 in | |
| July | 71°F (21°C) | 6.5 in | |
| August | 74°F (23°C) | 7.0 in | Warmest, Wettest |
| September | 66°F (19°C) | 6.9 in | |
| October | 55°F (13°C) | 4.6 in | |
| November | 45°F (7°C) | 3.0 in | |
| December | 36°F (2°C) | 2.4 in |
Nagano has a seasonal temperature swing of 43°F / from 31°F in January to 74°F in August. Total annual precipitation is 50.4 inches, with August being the wettest month (7.0") and January the driest (2.3").