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Weather & Climate in Declo, ID

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Declo experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 29°F in January while summers reach 72°F in July. The area gets 302 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 10.3 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 4,211 feet.

Temperature

29°F Jan (-2°C) 72°F Jul (22°C)
Annual Average49.0°F
9% below US avg
January Average29°F (-2°C)
July Average72°F (22°C)
Sunny Days302 days/yr

Geography

Elevation4,211 ft (1,284 m)
Area0.3 sq mi (0.7 km²)
Population Density1,836/sq mi
Coordinates42.5196°N, 113.6287°W
TimezoneAmerica/Boise
CountyCassia County County
Nearest AirportJoslin Field/Magic Valley Regional (TWF)
44 miles away

Precipitation & Snow

Annual Rainfall 10.3"
73% below US avg
Wettest Month (May) 1.26"
Driest Month (Jul) 0.51"

Air Quality

AQI Median33.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score43.6 / 100
Social Vulnerability22.4 / 100
Community Resilience20.8 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Relatively Low
Wildfire Relatively Moderate
Flood Relatively Low
Hail Very Low
Strong Wind Relatively Low
Heat Wave Relatively Low
Winter Weather Relatively Moderate
Lightning Relatively Moderate
Ice Storm Very Low
Drought Very Low
Cold Wave Relatively Low
Landslide Very Low
Volcano Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

99 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.

Nov 4, 1992 67 km ENE of Montello, Nevada M4.7 112 km 9 km
May 5, 2024 16 km SW of Thatcher, Utah M4.4 145 km 7 km
Jun 3, 2009 5 km WNW of Riverside, Utah M4.0 141 km 9 km
May 4, 2024 16 km SW of Thatcher, Utah M3.9 145 km 6 km
May 6, 2013 9 km NW of Grace, Idaho M3.9 148 km 5 km
Sep 24, 2019 5 km ENE of Howell, Utah M3.9 129 km 7 km
Jun 28, 1990 11 km NNE of Howell, Utah M3.8 123 km 6 km
Aug 30, 2000 9 km ENE of Snowville, Utah M3.6 102 km 7 km
Jul 3, 1993 7 km SSW of Malad City, Idaho M3.6 118 km 9 km
Nov 4, 1992 49 km SW of Snowville, Utah M3.6 111 km 13 km
Feb 1, 2008 6 km WNW of Riverside, Utah M3.5 141 km 9 km
Apr 24, 1998 10 km NE of Howell, Utah M3.5 129 km 11 km
Jan 24, 1990 14 km WSW of Howell, Utah M3.5 118 km 6 km
May 6, 2013 2 km NNE of Lava Hot Springs, Idaho M3.5 134 km 5 km
Apr 6, 2021 47 km SW of Howell, Utah M3.5 129 km 11 km
Jul 5, 1996 7 km WNW of Thatcher, Utah M3.4 136 km 4 km
May 5, 2024 14 km SW of Thatcher, Utah M3.4 144 km 2 km
Sep 8, 2024 15 km SW of Thatcher, Utah M3.4 144 km 5 km
Feb 11, 1992 10 km NW of Grace, Idaho M3.2 148 km 5 km
Sep 23, 1993 7 km SSW of Malad City, Idaho M3.2 118 km 6 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

66 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.

Date Rating Distance Path Fatalities
May 18, 1991 EF2 12 km 0.2 mi 0
Aug 17, 1990 EF2 72 km 4.0 mi 0
Jun 9, 1990 EF2 74 km 0.2 mi 0
Sep 11, 1968 EF2 30 km 0.5 mi 0
Jul 20, 1999 EF1 89 km 2.5 mi 0
Jun 11, 1993 EF1 99 km 10.0 mi 0
Apr 20, 1988 EF1 73 km 1.0 mi 0
Jul 21, 1987 EF1 80 km 0.2 mi 0
Aug 24, 1986 EF1 57 km 0.5 mi 0
Jun 24, 1986 EF1 98 km 0.5 mi 0
Sep 8, 1985 EF1 62 km 0.2 mi 0
May 2, 1985 EF1 90 km 0.1 mi 0
Jul 17, 1981 EF1 62 km 0.8 mi 0
Jun 7, 1972 EF1 23 km 0.5 mi 0
May 26, 1964 EF1 94 km 0.5 mi 0
Jun 5, 1957 EF1 55 km 0.1 mi 0
May 26, 2023 EF0 48 km 0.2 mi 0
Aug 2, 2019 EF0 13 km 1.0 mi 0
May 7, 2019 EF0 65 km 1.5 mi 0
May 28, 2018 EF0 97 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).

Year Location Cause Max Wave Deaths Distance
1909 UTAH Earthquake 3.6 m — 111 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

4 volcanoes within 200 km. Closest: Wapi Lava Field (52 km).

Name Type Elevation Last Eruption Distance
Wapi Lava Field Shield 1,604 m (5,262 ft) -300 52 km
Black Butte Crater Lava Field Shield 1,478 m (4,849 ft) -8400 94 km
Craters of the Moon Pyroclastic cone(s) 2,005 m (6,578 ft) -130 101 km
Hell's Half Acre Shield 1,631 m (5,351 ft) -3250 145 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: COXS WELL (219,424 acres, 1996).

Year Name Acres Burned Distance
1996 COXS WELL 219,424 86 km
2006 CRYSTAL 218,581 76 km
1996 RICHFIELDS 178,385 64 km
2007 WINECUP COMPLEX (WEST FORK) 159,805 94 km
1992 BLACK RIDGE 147,833 65 km
1999 MULE BUTTE 138,102 65 km
2012 FLAT TOP 2 102,340 58 km
2020 BADGER 86,836 54 km
2012 CAVE CANYON 84,780 47 km
2007 BLACK PINE 2 69,897 49 km
2007 HIGHWAY 93 COMPLEX (WEST BASIN) 63,143 98 km
2000 FLATTOP 56,792 69 km
2000 WEST BASIN 56,396 81 km
2017 POWERLINE 54,378 86 km
2006 STONE 2 50,677 83 km
2017 MAMMOTH CAVE 50,391 84 km
2005 RUPERT 45,361 49 km
2007 RED BRIDGE 44,096 68 km
2016 LAIDLAW 40,551 73 km
2017 SHOESTRING 35,543 87 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 29°F (-2°C) 0.9 in
February 32°F (-0°C) 0.7 in
March 39°F (4°C) 0.9 in
April 46°F (8°C) 0.9 in
May 54°F (12°C) 1.3 in Wettest
June 63°F (17°C) 1.1 in
July 72°F (22°C) 0.5 in Warmest, Driest
August 69°F (21°C) 0.6 in
September 60°F (15°C) 0.7 in
October 49°F (9°C) 0.7 in
November 36°F (2°C) 1.0 in
December 28°F (-2°C) 0.9 in Coldest

Declo has a seasonal temperature swing of 44°F / from 28°F in December to 72°F in July. Total annual precipitation is 10.0 inches, with May being the wettest month (1.3") and July the driest (0.5").

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