Declo, ID
Full City Profile · Idaho · Cassia County County
3.4
/5.0
B
Good
514
Population
1,836/sq mi density
$46,780
Median Income
$28,762 per capita
$218,200
Home Value
$463,068 Zillow
$1,063
Median Rent
26.1% income on rent
49°F
Avg Temperature
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$46,780 median income, 1.7% unemployment
A
Affordability
4.0 / 5.0
$218,200 home value, $1,063/mo rent
C
Education
2.4 / 5.0
17.1% bachelor's degree or higher
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. Annual precipitation totals 10.3 inches. The area receives 20.5 inches of snow annually.
Temperature
29°F Jan (-2°C)
72°F Jul (22°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 4,211 ft (1,284 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 1,836/sq mi |
| Coordinates | 42.5196°N, 113.6287°W |
| Timezone | America/Boise |
| County | Cassia County County |
| Nearest Airport | Joslin Field/Magic Valley Regional (TWF) 44 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 43.6 / 100 |
| Social Vulnerability | 22.4 / 100 |
| Community Resilience | 20.8 / 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)
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. Sorted by wave height.
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). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.1 in | Coldest |
| February | 33°F (1°C) | 0.7 in | |
| March | 41°F (5°C) | 1.0 in | |
| April | 47°F (8°C) | 1.1 in | |
| May | 56°F (13°C) | 1.7 in | Wettest |
| June | 63°F (17°C) | 0.8 in | |
| July | 72°F (22°C) | 0.3 in | Warmest, Driest |
| August | 70°F (21°C) | 0.4 in | |
| September | 61°F (16°C) | 0.7 in | |
| October | 49°F (10°C) | 0.8 in | |
| November | 38°F (3°C) | 0.8 in | |
| December | 29°F (-2°C) | 1.1 in |
Declo has a seasonal temperature swing of 42°F / from 29°F in January to 72°F in July. Total annual precipitation is 10.3 inches, with May being the wettest month (1.7") and July the driest (0.3").