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Weather & Climate in Mud Bay, AK
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mud Bay has a cool climate with an average annual temperature of 41°F (5°C). Winters average 24°F in January while summers reach 58°F in July. The area gets 166 sunny days per year, below the national average of 205. Annual precipitation totals 63.1 inches (wetter than the 38-inch national average). The area receives 163.9 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 21 / among the cleanest air in the country. The city sits at an elevation of 149 feet.
Temperature
24°F Jan (-5°C)
58°F Jul (15°C)
| Annual Average | 40.8°F |
| 24% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 58°F (15°C) |
| Sunny Days | 166 days/yr |
Geography
| Elevation | 149 ft (45 m) |
| Area | 12.1 sq mi (31.4 km²) |
| Population Density | 5/sq mi |
| Coordinates | 59.1512°N, 135.3565°W |
| Timezone | America/Anchorage |
| County | Haines Borough County |
| Nearest Airport | Juneau International (JNU) 62 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 21.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 4.3 / 100 |
| Social Vulnerability | 52.1 / 100 |
| Community Resilience | 10.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | No Rating |
| Strong Wind | No Rating |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
| Coastal Flood | No Rating |
| Tsunami | Very Low |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
968 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.3.
| May 1, 2017 | 48 km NW of Mosquito Lake, Alaska | M6.3 | 107 km | 3 km |
| May 1, 2017 | 47 km NW of Mosquito Lake, Alaska | M6.2 | 107 km | 10 km |
| Jul 25, 2014 | 40 km WNW of Elfin Cove, Alaska | M6.0 | 130 km | 10 km |
| Jan 9, 2007 | 59 km WSW of Mosquito Lake, Alaska | M5.7 | 104 km | 10 km |
| May 1, 2017 | 42 km NW of Mosquito Lake, Alaska | M5.7 | 102 km | 10 km |
| Jun 24, 1991 | 34 km WNW of Elfin Cove, Alaska | M5.6 | 125 km | 0 km |
| May 1, 2017 | 41 km NW of Mosquito Lake, Alaska | M5.6 | 100 km | 4 km |
| Jul 11, 1990 | 27 km WSW of Covenant Life, Alaska | M5.5 | 66 km | 10 km |
| Jun 4, 2014 | 63 km SW of Covenant Life, Alaska | M5.2 | 81 km | 8 km |
| Sep 16, 2017 | 54 km NW of Mosquito Lake, Alaska | M5.0 | 114 km | 7 km |
| May 1, 2017 | 57 km NW of Mosquito Lake, Alaska | M5.0 | 116 km | 8 km |
| Sep 1, 2019 | 64 km WSW of Covenant Life, Alaska | M5.0 | 92 km | 10 km |
| Jun 7, 2009 | 66 km NNW of Elfin Cove, Alaska | M5.0 | 86 km | 5 km |
| May 1, 2017 | 43 km NW of Mosquito Lake, Alaska | M5.0 | 102 km | 12 km |
| May 1, 2017 | 38 km NW of Mosquito Lake, Alaska | M4.9 | 98 km | 11 km |
| May 1, 2017 | 37 km NW of Mosquito Lake, Alaska | M4.8 | 97 km | 10 km |
| Jul 25, 2014 | 43 km WNW of Elfin Cove, Alaska | M4.7 | 134 km | 10 km |
| May 4, 2017 | 45 km NW of Mosquito Lake, Alaska | M4.7 | 104 km | 10 km |
| Aug 4, 2004 | 26 km WSW of Covenant Life, Alaska | M4.7 | 67 km | 2 km |
| Jul 25, 2014 | 41 km WNW of Elfin Cove, Alaska | M4.7 | 132 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
10 tsunamis recorded within 500 km. Highest wave on record: 524.6 m (1,721 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1958 | SE. ALASKA, AK | Eruption + Earthquake | 524.6 m | 5 | 115 km |
| 1936 | LITUYA BAY, AK | Meteorological | 149.4 m | — | 118 km |
| 1853 | LITUYA BAY, AK | Meteorological | 120.0 m | — | 140 km |
| 1874 | LITUYA BAY, AK | Meteorological | 24.4 m | — | 139 km |
| 1994 | SKAGWAY, AK | Meteorological | 9.0 m | 1 | 39 km |
| 1917 | TAKU INLET, JUNEAU, AK | Meteorological | 2.4 m | 1 | 126 km |
| 1907 | SKAGWAY, AK | Eruption + Earthquake | 0.7 m | — | 40 km |
| 2014 | PALMA BAY, AK | Earthquake | 0.1 m | — | 130 km |
| 2017 | SKAGWAY, AK | Earthquake | 0.1 m | — | 107 km |
| 1900 | LITUYA BAY, AK | Eruption + Earthquake | — | 5 | 138 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Atlin Volcanic Field (129 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Atlin Volcanic Field | Pyroclastic cone(s) | 1,880 m (6,168 ft) | Unknown | 129 km |
| Alligator Lake | Volcanic field | 2,217 m (7,274 ft) | Unknown | 141 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 5.4 in | Coldest |
| February | 25°F (-4°C) | 4.6 in | |
| March | 28°F (-2°C) | 3.4 in | |
| April | 35°F (2°C) | 2.3 in | |
| May | 43°F (6°C) | 2.0 in | Driest |
| June | 50°F (10°C) | 2.0 in | |
| July | 58°F (15°C) | 2.2 in | Warmest |
| August | 53°F (12°C) | 3.2 in | |
| September | 46°F (8°C) | 5.6 in | |
| October | 38°F (3°C) | 7.8 in | Wettest |
| November | 28°F (-2°C) | 6.1 in | |
| December | 24°F (-4°C) | 6.2 in |
Mud Bay has a seasonal temperature swing of 35°F / from 24°F in January to 58°F in July. Total annual precipitation is 50.8 inches, with October being the wettest month (7.8") and May the driest (2.0").