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Irwin, ID
Full City Profile · Idaho · Bonneville County County
3.1
/5.0
B
Good
253
Population
97/sq mi density
$69,792
Median Income
$38,094 per capita
$346,000
Home Value
$408,254 Zillow
43°F
Avg Temperature
291 sunny days/yr
34
Violent Crime/100K
818 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$69,792 median income, 0.0% unemployment
B+
Affordability
3.9 / 5.0
$346,000 home value, /mo rent
F
Safety
1.0 / 5.0
34 violent crimes/100K
B
Education
3.2 / 5.0
28.0% bachelor's degree or higher
Irwin has a cool climate with an average annual temperature of 43°F (6°C). Winters average 21°F in January while summers reach 65°F in July. The area gets 291 sunny days per year. Annual precipitation totals 20.1 inches. Air quality is rated Good with a median AQI of 33.
Temperature
21°F Jan (-6°C)
65°F Jul (19°C)
| Annual Average | 42.6°F |
| 21% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 65°F (19°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 5,334 ft (1,626 m) |
| Area | 2.5 sq mi (6.3 km²) |
| Population Density | 97/sq mi |
| Coordinates | 43.4034°N, 111.2795°W |
| Timezone | America/Boise |
| County | Bonneville County County |
| Nearest Airport | Jackson Hole (JAC) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.4 / 100 |
| Social Vulnerability | 12.2 / 100 |
| Community Resilience | 92.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Hell's Half Acre (95 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 95 km |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 124 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 168 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 179 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 2.1 in | |
| February | 22°F (-6°C) | 1.6 in | |
| March | 29°F (-2°C) | 1.5 in | |
| April | 36°F (2°C) | 1.7 in | |
| May | 46°F (8°C) | 2.4 in | Wettest |
| June | 54°F (12°C) | 1.9 in | |
| July | 65°F (19°C) | 1.3 in | Warmest, Driest |
| August | 61°F (16°C) | 1.4 in | |
| September | 52°F (11°C) | 1.7 in | |
| October | 41°F (5°C) | 1.5 in | |
| November | 29°F (-2°C) | 1.9 in | |
| December | 20°F (-7°C) | 1.8 in | Coldest |
Irwin has a seasonal temperature swing of 46°F / from 20°F in December to 65°F in July. Total annual precipitation is 20.7 inches, with May being the wettest month (2.4") and July the driest (1.3").